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/*
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 * Copyright (C) 2003-2004 the ffmpeg project
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file vp3.c
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 * On2 VP3 Video Decoder
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 *
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 * VP3 Video Decoder by Mike Melanson (mike at multimedia.cx)
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 * For more information about the VP3 coding process, visit:
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 *   http://wiki.multimedia.cx/index.php?title=On2_VP3
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 *
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 * Theora decoder by Alex Beregszaszi
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "avcodec.h"
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#include "dsputil.h"
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#include "bitstream.h"
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#include "vp3data.h"
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#include "xiph.h"
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#define FRAGMENT_PIXELS 8
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/*
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 * Debugging Variables
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 *
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 * Define one or more of the following compile-time variables to 1 to obtain
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 * elaborate information about certain aspects of the decoding process.
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 *
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 * KEYFRAMES_ONLY: set this to 1 to only see keyframes (VP3 slideshow mode)
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 * DEBUG_VP3: high-level decoding flow
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 * DEBUG_INIT: initialization parameters
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 * DEBUG_DEQUANTIZERS: display how the dequanization tables are built
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 * DEBUG_BLOCK_CODING: unpacking the superblock/macroblock/fragment coding
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 * DEBUG_MODES: unpacking the coding modes for individual fragments
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 * DEBUG_VECTORS: display the motion vectors
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 * DEBUG_TOKEN: display exhaustive information about each DCT token
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 * DEBUG_VLC: display the VLCs as they are extracted from the stream
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 * DEBUG_DC_PRED: display the process of reversing DC prediction
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 * DEBUG_IDCT: show every detail of the IDCT process
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 */
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#define KEYFRAMES_ONLY 0
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#define DEBUG_VP3 0
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#define DEBUG_INIT 0
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#define DEBUG_DEQUANTIZERS 0
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#define DEBUG_BLOCK_CODING 0
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#define DEBUG_MODES 0
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#define DEBUG_VECTORS 0
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#define DEBUG_TOKEN 0
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#define DEBUG_VLC 0
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#define DEBUG_DC_PRED 0
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#define DEBUG_IDCT 0
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#if DEBUG_VP3
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#define debug_vp3(args...) av_log(NULL, AV_LOG_DEBUG, ## args)
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#else
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static inline void debug_vp3(const char *format, ...) { }
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#endif
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#if DEBUG_INIT
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#define debug_init(args...) av_log(NULL, AV_LOG_DEBUG, ## args)
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#else
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static inline void debug_init(const char *format, ...) { }
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#endif
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#if DEBUG_DEQUANTIZERS
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#define debug_dequantizers(args...) av_log(NULL, AV_LOG_DEBUG, ## args)
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#else
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static inline void debug_dequantizers(const char *format, ...) { }
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#endif
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#if DEBUG_BLOCK_CODING
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#define debug_block_coding(args...) av_log(NULL, AV_LOG_DEBUG, ## args)
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#else
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static inline void debug_block_coding(const char *format, ...) { }
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#endif
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#if DEBUG_MODES
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#define debug_modes(args...) av_log(NULL, AV_LOG_DEBUG, ## args)
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#else
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static inline void debug_modes(const char *format, ...) { }
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#endif
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#if DEBUG_VECTORS
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#define debug_vectors(args...) av_log(NULL, AV_LOG_DEBUG, ## args)
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#else
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static inline void debug_vectors(const char *format, ...) { }
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#endif
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#if DEBUG_TOKEN
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#define debug_token(args...) av_log(NULL, AV_LOG_DEBUG, ## args)
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#else
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static inline void debug_token(const char *format, ...) { }
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#endif
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#if DEBUG_VLC
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#define debug_vlc(args...) av_log(NULL, AV_LOG_DEBUG, ## args)
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#else
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static inline void debug_vlc(const char *format, ...) { }
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#endif
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#if DEBUG_DC_PRED
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#define debug_dc_pred(args...) av_log(NULL, AV_LOG_DEBUG, ## args)
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#else
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static inline void debug_dc_pred(const char *format, ...) { }
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#endif
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#if DEBUG_IDCT
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#define debug_idct(args...) av_log(NULL, AV_LOG_DEBUG, ## args)
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#else
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static inline void debug_idct(const char *format, ...) { }
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#endif
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138
typedef struct Coeff {
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    struct Coeff *next;
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    DCTELEM coeff;
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    uint8_t index;
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} Coeff;
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//FIXME split things out into their own arrays
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typedef struct Vp3Fragment {
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    Coeff *next_coeff;
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    /* address of first pixel taking into account which plane the fragment
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     * lives on as well as the plane stride */
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    int first_pixel;
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    /* this is the macroblock that the fragment belongs to */
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    uint16_t macroblock;
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    uint8_t coding_method;
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    int8_t motion_x;
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    int8_t motion_y;
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} Vp3Fragment;
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#define SB_NOT_CODED        0
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#define SB_PARTIALLY_CODED  1
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#define SB_FULLY_CODED      2
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161
#define MODE_INTER_NO_MV      0
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#define MODE_INTRA            1
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#define MODE_INTER_PLUS_MV    2
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#define MODE_INTER_LAST_MV    3
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#define MODE_INTER_PRIOR_LAST 4
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#define MODE_USING_GOLDEN     5
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#define MODE_GOLDEN_MV        6
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#define MODE_INTER_FOURMV     7
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#define CODING_MODE_COUNT     8
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/* special internal mode */
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#define MODE_COPY             8
173

    
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/* There are 6 preset schemes, plus a free-form scheme */
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static int ModeAlphabet[7][CODING_MODE_COUNT] =
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{
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    /* this is the custom scheme */
178
    { 0, 0, 0, 0, 0, 0, 0, 0 },
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    /* scheme 1: Last motion vector dominates */
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    {    MODE_INTER_LAST_MV,    MODE_INTER_PRIOR_LAST,
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         MODE_INTER_PLUS_MV,    MODE_INTER_NO_MV,
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         MODE_INTRA,            MODE_USING_GOLDEN,
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         MODE_GOLDEN_MV,        MODE_INTER_FOURMV },
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    /* scheme 2 */
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    {    MODE_INTER_LAST_MV,    MODE_INTER_PRIOR_LAST,
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         MODE_INTER_NO_MV,      MODE_INTER_PLUS_MV,
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         MODE_INTRA,            MODE_USING_GOLDEN,
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         MODE_GOLDEN_MV,        MODE_INTER_FOURMV },
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    /* scheme 3 */
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    {    MODE_INTER_LAST_MV,    MODE_INTER_PLUS_MV,
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         MODE_INTER_PRIOR_LAST, MODE_INTER_NO_MV,
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         MODE_INTRA,            MODE_USING_GOLDEN,
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         MODE_GOLDEN_MV,        MODE_INTER_FOURMV },
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    /* scheme 4 */
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    {    MODE_INTER_LAST_MV,    MODE_INTER_PLUS_MV,
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         MODE_INTER_NO_MV,      MODE_INTER_PRIOR_LAST,
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         MODE_INTRA,            MODE_USING_GOLDEN,
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         MODE_GOLDEN_MV,        MODE_INTER_FOURMV },
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    /* scheme 5: No motion vector dominates */
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    {    MODE_INTER_NO_MV,      MODE_INTER_LAST_MV,
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         MODE_INTER_PRIOR_LAST, MODE_INTER_PLUS_MV,
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         MODE_INTRA,            MODE_USING_GOLDEN,
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         MODE_GOLDEN_MV,        MODE_INTER_FOURMV },
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    /* scheme 6 */
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    {    MODE_INTER_NO_MV,      MODE_USING_GOLDEN,
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         MODE_INTER_LAST_MV,    MODE_INTER_PRIOR_LAST,
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         MODE_INTER_PLUS_MV,    MODE_INTRA,
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         MODE_GOLDEN_MV,        MODE_INTER_FOURMV },
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};
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#define MIN_DEQUANT_VAL 2
219

    
220
typedef struct Vp3DecodeContext {
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    AVCodecContext *avctx;
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    int theora, theora_tables;
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    int version;
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    int width, height;
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    AVFrame golden_frame;
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    AVFrame last_frame;
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    AVFrame current_frame;
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    int keyframe;
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    DSPContext dsp;
230
    int flipped_image;
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    int qis[3];
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    int nqis;
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    int quality_index;
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    int last_quality_index;
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    int superblock_count;
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    int superblock_width;
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    int superblock_height;
240
    int y_superblock_width;
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    int y_superblock_height;
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    int c_superblock_width;
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    int c_superblock_height;
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    int u_superblock_start;
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    int v_superblock_start;
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    unsigned char *superblock_coding;
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    int macroblock_count;
249
    int macroblock_width;
250
    int macroblock_height;
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252
    int fragment_count;
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    int fragment_width;
254
    int fragment_height;
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256
    Vp3Fragment *all_fragments;
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    uint8_t *coeff_counts;
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    Coeff *coeffs;
259
    Coeff *next_coeff;
260
    int fragment_start[3];
261

    
262
    ScanTable scantable;
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264
    /* tables */
265
    uint16_t coded_dc_scale_factor[64];
266
    uint32_t coded_ac_scale_factor[64];
267
    uint8_t base_matrix[384][64];
268
    uint8_t qr_count[2][3];
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    uint8_t qr_size [2][3][64];
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    uint16_t qr_base[2][3][64];
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272
    /* this is a list of indexes into the all_fragments array indicating
273
     * which of the fragments are coded */
274
    int *coded_fragment_list;
275
    int coded_fragment_list_index;
276
    int pixel_addresses_initialized;
277

    
278
    VLC dc_vlc[16];
279
    VLC ac_vlc_1[16];
280
    VLC ac_vlc_2[16];
281
    VLC ac_vlc_3[16];
282
    VLC ac_vlc_4[16];
283

    
284
    VLC superblock_run_length_vlc;
285
    VLC fragment_run_length_vlc;
286
    VLC mode_code_vlc;
287
    VLC motion_vector_vlc;
288

    
289
    /* these arrays need to be on 16-byte boundaries since SSE2 operations
290
     * index into them */
291
    DECLARE_ALIGNED_16(int16_t, qmat[2][4][64]);        //<qmat[is_inter][plane]
292

    
293
    /* This table contains superblock_count * 16 entries. Each set of 16
294
     * numbers corresponds to the fragment indexes 0..15 of the superblock.
295
     * An entry will be -1 to indicate that no entry corresponds to that
296
     * index. */
297
    int *superblock_fragments;
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299
    /* This table contains superblock_count * 4 entries. Each set of 4
300
     * numbers corresponds to the macroblock indexes 0..3 of the superblock.
301
     * An entry will be -1 to indicate that no entry corresponds to that
302
     * index. */
303
    int *superblock_macroblocks;
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305
    /* This table contains macroblock_count * 6 entries. Each set of 6
306
     * numbers corresponds to the fragment indexes 0..5 which comprise
307
     * the macroblock (4 Y fragments and 2 C fragments). */
308
    int *macroblock_fragments;
309
    /* This is an array that indicates how a particular macroblock
310
     * is coded. */
311
    unsigned char *macroblock_coding;
312

    
313
    int first_coded_y_fragment;
314
    int first_coded_c_fragment;
315
    int last_coded_y_fragment;
316
    int last_coded_c_fragment;
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318
    uint8_t edge_emu_buffer[9*2048]; //FIXME dynamic alloc
319
    int8_t qscale_table[2048]; //FIXME dynamic alloc (width+15)/16
320

    
321
    /* Huffman decode */
322
    int hti;
323
    unsigned int hbits;
324
    int entries;
325
    int huff_code_size;
326
    uint16_t huffman_table[80][32][2];
327

    
328
    uint32_t filter_limit_values[64];
329
    int bounding_values_array[256];
330
} Vp3DecodeContext;
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332
/************************************************************************
333
 * VP3 specific functions
334
 ************************************************************************/
335

    
336
/*
337
 * This function sets up all of the various blocks mappings:
338
 * superblocks <-> fragments, macroblocks <-> fragments,
339
 * superblocks <-> macroblocks
340
 *
341
 * Returns 0 is successful; returns 1 if *anything* went wrong.
342
 */
343
static int init_block_mapping(Vp3DecodeContext *s)
344
{
345
    int i, j;
346
    signed int hilbert_walk_mb[4];
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348
    int current_fragment = 0;
349
    int current_width = 0;
350
    int current_height = 0;
351
    int right_edge = 0;
352
    int bottom_edge = 0;
353
    int superblock_row_inc = 0;
354
    int *hilbert = NULL;
355
    int mapping_index = 0;
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357
    int current_macroblock;
358
    int c_fragment;
359

    
360
    signed char travel_width[16] = {
361
         1,  1,  0, -1,
362
         0,  0,  1,  0,
363
         1,  0,  1,  0,
364
         0, -1,  0,  1
365
    };
366

    
367
    signed char travel_height[16] = {
368
         0,  0,  1,  0,
369
         1,  1,  0, -1,
370
         0,  1,  0, -1,
371
        -1,  0, -1,  0
372
    };
373

    
374
    signed char travel_width_mb[4] = {
375
         1,  0,  1,  0
376
    };
377

    
378
    signed char travel_height_mb[4] = {
379
         0,  1,  0, -1
380
    };
381

    
382
    debug_vp3("  vp3: initialize block mapping tables\n");
383

    
384
    hilbert_walk_mb[0] = 1;
385
    hilbert_walk_mb[1] = s->macroblock_width;
386
    hilbert_walk_mb[2] = 1;
387
    hilbert_walk_mb[3] = -s->macroblock_width;
388

    
389
    /* iterate through each superblock (all planes) and map the fragments */
390
    for (i = 0; i < s->superblock_count; i++) {
391
        debug_init("    superblock %d (u starts @ %d, v starts @ %d)\n",
392
            i, s->u_superblock_start, s->v_superblock_start);
393

    
394
        /* time to re-assign the limits? */
395
        if (i == 0) {
396

    
397
            /* start of Y superblocks */
398
            right_edge = s->fragment_width;
399
            bottom_edge = s->fragment_height;
400
            current_width = -1;
401
            current_height = 0;
402
            superblock_row_inc = 3 * s->fragment_width -
403
                (s->y_superblock_width * 4 - s->fragment_width);
404

    
405
            /* the first operation for this variable is to advance by 1 */
406
            current_fragment = -1;
407

    
408
        } else if (i == s->u_superblock_start) {
409

    
410
            /* start of U superblocks */
411
            right_edge = s->fragment_width / 2;
412
            bottom_edge = s->fragment_height / 2;
413
            current_width = -1;
414
            current_height = 0;
415
            superblock_row_inc = 3 * (s->fragment_width / 2) -
416
                (s->c_superblock_width * 4 - s->fragment_width / 2);
417

    
418
            /* the first operation for this variable is to advance by 1 */
419
            current_fragment = s->fragment_start[1] - 1;
420

    
421
        } else if (i == s->v_superblock_start) {
422

    
423
            /* start of V superblocks */
424
            right_edge = s->fragment_width / 2;
425
            bottom_edge = s->fragment_height / 2;
426
            current_width = -1;
427
            current_height = 0;
428
            superblock_row_inc = 3 * (s->fragment_width / 2) -
429
                (s->c_superblock_width * 4 - s->fragment_width / 2);
430

    
431
            /* the first operation for this variable is to advance by 1 */
432
            current_fragment = s->fragment_start[2] - 1;
433

    
434
        }
435

    
436
        if (current_width >= right_edge - 1) {
437
            /* reset width and move to next superblock row */
438
            current_width = -1;
439
            current_height += 4;
440

    
441
            /* fragment is now at the start of a new superblock row */
442
            current_fragment += superblock_row_inc;
443
        }
444

    
445
        /* iterate through all 16 fragments in a superblock */
446
        for (j = 0; j < 16; j++) {
447
            current_fragment += travel_width[j] + right_edge * travel_height[j];
448
            current_width += travel_width[j];
449
            current_height += travel_height[j];
450

    
451
            /* check if the fragment is in bounds */
452
            if ((current_width < right_edge) &&
453
                (current_height < bottom_edge)) {
454
                s->superblock_fragments[mapping_index] = current_fragment;
455
                debug_init("    mapping fragment %d to superblock %d, position %d (%d/%d x %d/%d)\n",
456
                    s->superblock_fragments[mapping_index], i, j,
457
                    current_width, right_edge, current_height, bottom_edge);
458
            } else {
459
                s->superblock_fragments[mapping_index] = -1;
460
                debug_init("    superblock %d, position %d has no fragment (%d/%d x %d/%d)\n",
461
                    i, j,
462
                    current_width, right_edge, current_height, bottom_edge);
463
            }
464

    
465
            mapping_index++;
466
        }
467
    }
468

    
469
    /* initialize the superblock <-> macroblock mapping; iterate through
470
     * all of the Y plane superblocks to build this mapping */
471
    right_edge = s->macroblock_width;
472
    bottom_edge = s->macroblock_height;
473
    current_width = -1;
474
    current_height = 0;
475
    superblock_row_inc = s->macroblock_width -
476
        (s->y_superblock_width * 2 - s->macroblock_width);
477
    hilbert = hilbert_walk_mb;
478
    mapping_index = 0;
479
    current_macroblock = -1;
480
    for (i = 0; i < s->u_superblock_start; i++) {
481

    
482
        if (current_width >= right_edge - 1) {
483
            /* reset width and move to next superblock row */
484
            current_width = -1;
485
            current_height += 2;
486

    
487
            /* macroblock is now at the start of a new superblock row */
488
            current_macroblock += superblock_row_inc;
489
        }
490

    
491
        /* iterate through each potential macroblock in the superblock */
492
        for (j = 0; j < 4; j++) {
493
            current_macroblock += hilbert_walk_mb[j];
494
            current_width += travel_width_mb[j];
495
            current_height += travel_height_mb[j];
496

    
497
            /* check if the macroblock is in bounds */
498
            if ((current_width < right_edge) &&
499
                (current_height < bottom_edge)) {
500
                s->superblock_macroblocks[mapping_index] = current_macroblock;
501
                debug_init("    mapping macroblock %d to superblock %d, position %d (%d/%d x %d/%d)\n",
502
                    s->superblock_macroblocks[mapping_index], i, j,
503
                    current_width, right_edge, current_height, bottom_edge);
504
            } else {
505
                s->superblock_macroblocks[mapping_index] = -1;
506
                debug_init("    superblock %d, position %d has no macroblock (%d/%d x %d/%d)\n",
507
                    i, j,
508
                    current_width, right_edge, current_height, bottom_edge);
509
            }
510

    
511
            mapping_index++;
512
        }
513
    }
514

    
515
    /* initialize the macroblock <-> fragment mapping */
516
    current_fragment = 0;
517
    current_macroblock = 0;
518
    mapping_index = 0;
519
    for (i = 0; i < s->fragment_height; i += 2) {
520

    
521
        for (j = 0; j < s->fragment_width; j += 2) {
522

    
523
            debug_init("    macroblock %d contains fragments: ", current_macroblock);
524
            s->all_fragments[current_fragment].macroblock = current_macroblock;
525
            s->macroblock_fragments[mapping_index++] = current_fragment;
526
            debug_init("%d ", current_fragment);
527

    
528
            if (j + 1 < s->fragment_width) {
529
                s->all_fragments[current_fragment + 1].macroblock = current_macroblock;
530
                s->macroblock_fragments[mapping_index++] = current_fragment + 1;
531
                debug_init("%d ", current_fragment + 1);
532
            } else
533
                s->macroblock_fragments[mapping_index++] = -1;
534

    
535
            if (i + 1 < s->fragment_height) {
536
                s->all_fragments[current_fragment + s->fragment_width].macroblock =
537
                    current_macroblock;
538
                s->macroblock_fragments[mapping_index++] =
539
                    current_fragment + s->fragment_width;
540
                debug_init("%d ", current_fragment + s->fragment_width);
541
            } else
542
                s->macroblock_fragments[mapping_index++] = -1;
543

    
544
            if ((j + 1 < s->fragment_width) && (i + 1 < s->fragment_height)) {
545
                s->all_fragments[current_fragment + s->fragment_width + 1].macroblock =
546
                    current_macroblock;
547
                s->macroblock_fragments[mapping_index++] =
548
                    current_fragment + s->fragment_width + 1;
549
                debug_init("%d ", current_fragment + s->fragment_width + 1);
550
            } else
551
                s->macroblock_fragments[mapping_index++] = -1;
552

    
553
            /* C planes */
554
            c_fragment = s->fragment_start[1] +
555
                (i * s->fragment_width / 4) + (j / 2);
556
            s->all_fragments[c_fragment].macroblock = s->macroblock_count;
557
            s->macroblock_fragments[mapping_index++] = c_fragment;
558
            debug_init("%d ", c_fragment);
559

    
560
            c_fragment = s->fragment_start[2] +
561
                (i * s->fragment_width / 4) + (j / 2);
562
            s->all_fragments[c_fragment].macroblock = s->macroblock_count;
563
            s->macroblock_fragments[mapping_index++] = c_fragment;
564
            debug_init("%d ", c_fragment);
565

    
566
            debug_init("\n");
567

    
568
            if (j + 2 <= s->fragment_width)
569
                current_fragment += 2;
570
            else
571
                current_fragment++;
572
            current_macroblock++;
573
        }
574

    
575
        current_fragment += s->fragment_width;
576
    }
577

    
578
    return 0;  /* successful path out */
579
}
580

    
581
/*
582
 * This function wipes out all of the fragment data.
583
 */
584
static void init_frame(Vp3DecodeContext *s, GetBitContext *gb)
585
{
586
    int i;
587

    
588
    /* zero out all of the fragment information */
589
    s->coded_fragment_list_index = 0;
590
    for (i = 0; i < s->fragment_count; i++) {
591
        s->coeff_counts[i] = 0;
592
        s->all_fragments[i].motion_x = 127;
593
        s->all_fragments[i].motion_y = 127;
594
        s->all_fragments[i].next_coeff= NULL;
595
        s->coeffs[i].index=
596
        s->coeffs[i].coeff=0;
597
        s->coeffs[i].next= NULL;
598
    }
599
}
600

    
601
/*
602
 * This function sets up the dequantization tables used for a particular
603
 * frame.
604
 */
605
static void init_dequantizer(Vp3DecodeContext *s)
606
{
607
    int ac_scale_factor = s->coded_ac_scale_factor[s->quality_index];
608
    int dc_scale_factor = s->coded_dc_scale_factor[s->quality_index];
609
    int i, plane, inter, qri, bmi, bmj, qistart;
610

    
611
    debug_vp3("  vp3: initializing dequantization tables\n");
612

    
613
    for(inter=0; inter<2; inter++){
614
        for(plane=0; plane<3; plane++){
615
            int sum=0;
616
            for(qri=0; qri<s->qr_count[inter][plane]; qri++){
617
                sum+= s->qr_size[inter][plane][qri];
618
                if(s->quality_index <= sum)
619
                    break;
620
            }
621
            qistart= sum - s->qr_size[inter][plane][qri];
622
            bmi= s->qr_base[inter][plane][qri  ];
623
            bmj= s->qr_base[inter][plane][qri+1];
624
            for(i=0; i<64; i++){
625
                int coeff= (  2*(sum    -s->quality_index)*s->base_matrix[bmi][i]
626
                            - 2*(qistart-s->quality_index)*s->base_matrix[bmj][i]
627
                            + s->qr_size[inter][plane][qri])
628
                           / (2*s->qr_size[inter][plane][qri]);
629

    
630
                int qmin= 8<<(inter + !i);
631
                int qscale= i ? ac_scale_factor : dc_scale_factor;
632

    
633
                s->qmat[inter][plane][i]= av_clip((qscale * coeff)/100 * 4, qmin, 4096);
634
            }
635
        }
636
    }
637

    
638
    memset(s->qscale_table, (FFMAX(s->qmat[0][0][1], s->qmat[0][1][1])+8)/16, 512); //FIXME finetune
639
}
640

    
641
/*
642
 * This function initializes the loop filter boundary limits if the frame's
643
 * quality index is different from the previous frame's.
644
 */
645
static void init_loop_filter(Vp3DecodeContext *s)
646
{
647
    int *bounding_values= s->bounding_values_array+127;
648
    int filter_limit;
649
    int x;
650

    
651
    filter_limit = s->filter_limit_values[s->quality_index];
652

    
653
    /* set up the bounding values */
654
    memset(s->bounding_values_array, 0, 256 * sizeof(int));
655
    for (x = 0; x < filter_limit; x++) {
656
        bounding_values[-x - filter_limit] = -filter_limit + x;
657
        bounding_values[-x] = -x;
658
        bounding_values[x] = x;
659
        bounding_values[x + filter_limit] = filter_limit - x;
660
    }
661
}
662

    
663
/*
664
 * This function unpacks all of the superblock/macroblock/fragment coding
665
 * information from the bitstream.
666
 */
667
static int unpack_superblocks(Vp3DecodeContext *s, GetBitContext *gb)
668
{
669
    int bit = 0;
670
    int current_superblock = 0;
671
    int current_run = 0;
672
    int decode_fully_flags = 0;
673
    int decode_partial_blocks = 0;
674
    int first_c_fragment_seen;
675

    
676
    int i, j;
677
    int current_fragment;
678

    
679
    debug_vp3("  vp3: unpacking superblock coding\n");
680

    
681
    if (s->keyframe) {
682

    
683
        debug_vp3("    keyframe-- all superblocks are fully coded\n");
684
        memset(s->superblock_coding, SB_FULLY_CODED, s->superblock_count);
685

    
686
    } else {
687

    
688
        /* unpack the list of partially-coded superblocks */
689
        bit = get_bits1(gb);
690
        /* toggle the bit because as soon as the first run length is
691
         * fetched the bit will be toggled again */
692
        bit ^= 1;
693
        while (current_superblock < s->superblock_count) {
694
            if (current_run-- == 0) {
695
                bit ^= 1;
696
                current_run = get_vlc2(gb,
697
                    s->superblock_run_length_vlc.table, 6, 2);
698
                if (current_run == 33)
699
                    current_run += get_bits(gb, 12);
700
                debug_block_coding("      setting superblocks %d..%d to %s\n",
701
                    current_superblock,
702
                    current_superblock + current_run - 1,
703
                    (bit) ? "partially coded" : "not coded");
704

    
705
                /* if any of the superblocks are not partially coded, flag
706
                 * a boolean to decode the list of fully-coded superblocks */
707
                if (bit == 0) {
708
                    decode_fully_flags = 1;
709
                } else {
710

    
711
                    /* make a note of the fact that there are partially coded
712
                     * superblocks */
713
                    decode_partial_blocks = 1;
714
                }
715
            }
716
            s->superblock_coding[current_superblock++] = bit;
717
        }
718

    
719
        /* unpack the list of fully coded superblocks if any of the blocks were
720
         * not marked as partially coded in the previous step */
721
        if (decode_fully_flags) {
722

    
723
            current_superblock = 0;
724
            current_run = 0;
725
            bit = get_bits1(gb);
726
            /* toggle the bit because as soon as the first run length is
727
             * fetched the bit will be toggled again */
728
            bit ^= 1;
729
            while (current_superblock < s->superblock_count) {
730

    
731
                /* skip any superblocks already marked as partially coded */
732
                if (s->superblock_coding[current_superblock] == SB_NOT_CODED) {
733

    
734
                    if (current_run-- == 0) {
735
                        bit ^= 1;
736
                        current_run = get_vlc2(gb,
737
                            s->superblock_run_length_vlc.table, 6, 2);
738
                        if (current_run == 33)
739
                            current_run += get_bits(gb, 12);
740
                    }
741

    
742
                    debug_block_coding("      setting superblock %d to %s\n",
743
                        current_superblock,
744
                        (bit) ? "fully coded" : "not coded");
745
                    s->superblock_coding[current_superblock] = 2*bit;
746
                }
747
                current_superblock++;
748
            }
749
        }
750

    
751
        /* if there were partial blocks, initialize bitstream for
752
         * unpacking fragment codings */
753
        if (decode_partial_blocks) {
754

    
755
            current_run = 0;
756
            bit = get_bits1(gb);
757
            /* toggle the bit because as soon as the first run length is
758
             * fetched the bit will be toggled again */
759
            bit ^= 1;
760
        }
761
    }
762

    
763
    /* figure out which fragments are coded; iterate through each
764
     * superblock (all planes) */
765
    s->coded_fragment_list_index = 0;
766
    s->next_coeff= s->coeffs + s->fragment_count;
767
    s->first_coded_y_fragment = s->first_coded_c_fragment = 0;
768
    s->last_coded_y_fragment = s->last_coded_c_fragment = -1;
769
    first_c_fragment_seen = 0;
770
    memset(s->macroblock_coding, MODE_COPY, s->macroblock_count);
771
    for (i = 0; i < s->superblock_count; i++) {
772

    
773
        /* iterate through all 16 fragments in a superblock */
774
        for (j = 0; j < 16; j++) {
775

    
776
            /* if the fragment is in bounds, check its coding status */
777
            current_fragment = s->superblock_fragments[i * 16 + j];
778
            if (current_fragment >= s->fragment_count) {
779
                av_log(s->avctx, AV_LOG_ERROR, "  vp3:unpack_superblocks(): bad fragment number (%d >= %d)\n",
780
                    current_fragment, s->fragment_count);
781
                return 1;
782
            }
783
            if (current_fragment != -1) {
784
                if (s->superblock_coding[i] == SB_NOT_CODED) {
785

    
786
                    /* copy all the fragments from the prior frame */
787
                    s->all_fragments[current_fragment].coding_method =
788
                        MODE_COPY;
789

    
790
                } else if (s->superblock_coding[i] == SB_PARTIALLY_CODED) {
791

    
792
                    /* fragment may or may not be coded; this is the case
793
                     * that cares about the fragment coding runs */
794
                    if (current_run-- == 0) {
795
                        bit ^= 1;
796
                        current_run = get_vlc2(gb,
797
                            s->fragment_run_length_vlc.table, 5, 2);
798
                    }
799

    
800
                    if (bit) {
801
                        /* default mode; actual mode will be decoded in
802
                         * the next phase */
803
                        s->all_fragments[current_fragment].coding_method =
804
                            MODE_INTER_NO_MV;
805
                        s->all_fragments[current_fragment].next_coeff= s->coeffs + current_fragment;
806
                        s->coded_fragment_list[s->coded_fragment_list_index] =
807
                            current_fragment;
808
                        if ((current_fragment >= s->fragment_start[1]) &&
809
                            (s->last_coded_y_fragment == -1) &&
810
                            (!first_c_fragment_seen)) {
811
                            s->first_coded_c_fragment = s->coded_fragment_list_index;
812
                            s->last_coded_y_fragment = s->first_coded_c_fragment - 1;
813
                            first_c_fragment_seen = 1;
814
                        }
815
                        s->coded_fragment_list_index++;
816
                        s->macroblock_coding[s->all_fragments[current_fragment].macroblock] = MODE_INTER_NO_MV;
817
                        debug_block_coding("      superblock %d is partially coded, fragment %d is coded\n",
818
                            i, current_fragment);
819
                    } else {
820
                        /* not coded; copy this fragment from the prior frame */
821
                        s->all_fragments[current_fragment].coding_method =
822
                            MODE_COPY;
823
                        debug_block_coding("      superblock %d is partially coded, fragment %d is not coded\n",
824
                            i, current_fragment);
825
                    }
826

    
827
                } else {
828

    
829
                    /* fragments are fully coded in this superblock; actual
830
                     * coding will be determined in next step */
831
                    s->all_fragments[current_fragment].coding_method =
832
                        MODE_INTER_NO_MV;
833
                    s->all_fragments[current_fragment].next_coeff= s->coeffs + current_fragment;
834
                    s->coded_fragment_list[s->coded_fragment_list_index] =
835
                        current_fragment;
836
                    if ((current_fragment >= s->fragment_start[1]) &&
837
                        (s->last_coded_y_fragment == -1) &&
838
                        (!first_c_fragment_seen)) {
839
                        s->first_coded_c_fragment = s->coded_fragment_list_index;
840
                        s->last_coded_y_fragment = s->first_coded_c_fragment - 1;
841
                        first_c_fragment_seen = 1;
842
                    }
843
                    s->coded_fragment_list_index++;
844
                    s->macroblock_coding[s->all_fragments[current_fragment].macroblock] = MODE_INTER_NO_MV;
845
                    debug_block_coding("      superblock %d is fully coded, fragment %d is coded\n",
846
                        i, current_fragment);
847
                }
848
            }
849
        }
850
    }
851

    
852
    if (!first_c_fragment_seen)
853
        /* only Y fragments coded in this frame */
854
        s->last_coded_y_fragment = s->coded_fragment_list_index - 1;
855
    else
856
        /* end the list of coded C fragments */
857
        s->last_coded_c_fragment = s->coded_fragment_list_index - 1;
858

    
859
    debug_block_coding("    %d total coded fragments, y: %d -> %d, c: %d -> %d\n",
860
        s->coded_fragment_list_index,
861
        s->first_coded_y_fragment,
862
        s->last_coded_y_fragment,
863
        s->first_coded_c_fragment,
864
        s->last_coded_c_fragment);
865

    
866
    return 0;
867
}
868

    
869
/*
870
 * This function unpacks all the coding mode data for individual macroblocks
871
 * from the bitstream.
872
 */
873
static int unpack_modes(Vp3DecodeContext *s, GetBitContext *gb)
874
{
875
    int i, j, k;
876
    int scheme;
877
    int current_macroblock;
878
    int current_fragment;
879
    int coding_mode;
880

    
881
    debug_vp3("  vp3: unpacking encoding modes\n");
882

    
883
    if (s->keyframe) {
884
        debug_vp3("    keyframe-- all blocks are coded as INTRA\n");
885

    
886
        for (i = 0; i < s->fragment_count; i++)
887
            s->all_fragments[i].coding_method = MODE_INTRA;
888

    
889
    } else {
890

    
891
        /* fetch the mode coding scheme for this frame */
892
        scheme = get_bits(gb, 3);
893
        debug_modes("    using mode alphabet %d\n", scheme);
894

    
895
        /* is it a custom coding scheme? */
896
        if (scheme == 0) {
897
            debug_modes("    custom mode alphabet ahead:\n");
898
            for (i = 0; i < 8; i++)
899
                ModeAlphabet[scheme][get_bits(gb, 3)] = i;
900
        }
901

    
902
        for (i = 0; i < 8; i++)
903
            debug_modes("      mode[%d][%d] = %d\n", scheme, i,
904
                ModeAlphabet[scheme][i]);
905

    
906
        /* iterate through all of the macroblocks that contain 1 or more
907
         * coded fragments */
908
        for (i = 0; i < s->u_superblock_start; i++) {
909

    
910
            for (j = 0; j < 4; j++) {
911
                current_macroblock = s->superblock_macroblocks[i * 4 + j];
912
                if ((current_macroblock == -1) ||
913
                    (s->macroblock_coding[current_macroblock] == MODE_COPY))
914
                    continue;
915
                if (current_macroblock >= s->macroblock_count) {
916
                    av_log(s->avctx, AV_LOG_ERROR, "  vp3:unpack_modes(): bad macroblock number (%d >= %d)\n",
917
                        current_macroblock, s->macroblock_count);
918
                    return 1;
919
                }
920

    
921
                /* mode 7 means get 3 bits for each coding mode */
922
                if (scheme == 7)
923
                    coding_mode = get_bits(gb, 3);
924
                else
925
                    coding_mode = ModeAlphabet[scheme]
926
                        [get_vlc2(gb, s->mode_code_vlc.table, 3, 3)];
927

    
928
                s->macroblock_coding[current_macroblock] = coding_mode;
929
                for (k = 0; k < 6; k++) {
930
                    current_fragment =
931
                        s->macroblock_fragments[current_macroblock * 6 + k];
932
                    if (current_fragment == -1)
933
                        continue;
934
                    if (current_fragment >= s->fragment_count) {
935
                        av_log(s->avctx, AV_LOG_ERROR, "  vp3:unpack_modes(): bad fragment number (%d >= %d)\n",
936
                            current_fragment, s->fragment_count);
937
                        return 1;
938
                    }
939
                    if (s->all_fragments[current_fragment].coding_method !=
940
                        MODE_COPY)
941
                        s->all_fragments[current_fragment].coding_method =
942
                            coding_mode;
943
                }
944

    
945
                debug_modes("    coding method for macroblock starting @ fragment %d = %d\n",
946
                    s->macroblock_fragments[current_macroblock * 6], coding_mode);
947
            }
948
        }
949
    }
950

    
951
    return 0;
952
}
953

    
954
/*
955
 * This function unpacks all the motion vectors for the individual
956
 * macroblocks from the bitstream.
957
 */
958
static int unpack_vectors(Vp3DecodeContext *s, GetBitContext *gb)
959
{
960
    int i, j, k;
961
    int coding_mode;
962
    int motion_x[6];
963
    int motion_y[6];
964
    int last_motion_x = 0;
965
    int last_motion_y = 0;
966
    int prior_last_motion_x = 0;
967
    int prior_last_motion_y = 0;
968
    int current_macroblock;
969
    int current_fragment;
970

    
971
    debug_vp3("  vp3: unpacking motion vectors\n");
972
    if (s->keyframe) {
973

    
974
        debug_vp3("    keyframe-- there are no motion vectors\n");
975

    
976
    } else {
977

    
978
        memset(motion_x, 0, 6 * sizeof(int));
979
        memset(motion_y, 0, 6 * sizeof(int));
980

    
981
        /* coding mode 0 is the VLC scheme; 1 is the fixed code scheme */
982
        coding_mode = get_bits1(gb);
983
        debug_vectors("    using %s scheme for unpacking motion vectors\n",
984
            (coding_mode == 0) ? "VLC" : "fixed-length");
985

    
986
        /* iterate through all of the macroblocks that contain 1 or more
987
         * coded fragments */
988
        for (i = 0; i < s->u_superblock_start; i++) {
989

    
990
            for (j = 0; j < 4; j++) {
991
                current_macroblock = s->superblock_macroblocks[i * 4 + j];
992
                if ((current_macroblock == -1) ||
993
                    (s->macroblock_coding[current_macroblock] == MODE_COPY))
994
                    continue;
995
                if (current_macroblock >= s->macroblock_count) {
996
                    av_log(s->avctx, AV_LOG_ERROR, "  vp3:unpack_vectors(): bad macroblock number (%d >= %d)\n",
997
                        current_macroblock, s->macroblock_count);
998
                    return 1;
999
                }
1000

    
1001
                current_fragment = s->macroblock_fragments[current_macroblock * 6];
1002
                if (current_fragment >= s->fragment_count) {
1003
                    av_log(s->avctx, AV_LOG_ERROR, "  vp3:unpack_vectors(): bad fragment number (%d >= %d\n",
1004
                        current_fragment, s->fragment_count);
1005
                    return 1;
1006
                }
1007
                switch (s->macroblock_coding[current_macroblock]) {
1008

    
1009
                case MODE_INTER_PLUS_MV:
1010
                case MODE_GOLDEN_MV:
1011
                    /* all 6 fragments use the same motion vector */
1012
                    if (coding_mode == 0) {
1013
                        motion_x[0] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)];
1014
                        motion_y[0] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)];
1015
                    } else {
1016
                        motion_x[0] = fixed_motion_vector_table[get_bits(gb, 6)];
1017
                        motion_y[0] = fixed_motion_vector_table[get_bits(gb, 6)];
1018
                    }
1019

    
1020
                    for (k = 1; k < 6; k++) {
1021
                        motion_x[k] = motion_x[0];
1022
                        motion_y[k] = motion_y[0];
1023
                    }
1024

    
1025
                    /* vector maintenance, only on MODE_INTER_PLUS_MV */
1026
                    if (s->macroblock_coding[current_macroblock] ==
1027
                        MODE_INTER_PLUS_MV) {
1028
                        prior_last_motion_x = last_motion_x;
1029
                        prior_last_motion_y = last_motion_y;
1030
                        last_motion_x = motion_x[0];
1031
                        last_motion_y = motion_y[0];
1032
                    }
1033
                    break;
1034

    
1035
                case MODE_INTER_FOURMV:
1036
                    /* fetch 4 vectors from the bitstream, one for each
1037
                     * Y fragment, then average for the C fragment vectors */
1038
                    motion_x[4] = motion_y[4] = 0;
1039
                    for (k = 0; k < 4; k++) {
1040
                        if (coding_mode == 0) {
1041
                            motion_x[k] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)];
1042
                            motion_y[k] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)];
1043
                        } else {
1044
                            motion_x[k] = fixed_motion_vector_table[get_bits(gb, 6)];
1045
                            motion_y[k] = fixed_motion_vector_table[get_bits(gb, 6)];
1046
                        }
1047
                        motion_x[4] += motion_x[k];
1048
                        motion_y[4] += motion_y[k];
1049
                    }
1050

    
1051
                    motion_x[5]=
1052
                    motion_x[4]= RSHIFT(motion_x[4], 2);
1053
                    motion_y[5]=
1054
                    motion_y[4]= RSHIFT(motion_y[4], 2);
1055

    
1056
                    /* vector maintenance; vector[3] is treated as the
1057
                     * last vector in this case */
1058
                    prior_last_motion_x = last_motion_x;
1059
                    prior_last_motion_y = last_motion_y;
1060
                    last_motion_x = motion_x[3];
1061
                    last_motion_y = motion_y[3];
1062
                    break;
1063

    
1064
                case MODE_INTER_LAST_MV:
1065
                    /* all 6 fragments use the last motion vector */
1066
                    motion_x[0] = last_motion_x;
1067
                    motion_y[0] = last_motion_y;
1068
                    for (k = 1; k < 6; k++) {
1069
                        motion_x[k] = motion_x[0];
1070
                        motion_y[k] = motion_y[0];
1071
                    }
1072

    
1073
                    /* no vector maintenance (last vector remains the
1074
                     * last vector) */
1075
                    break;
1076

    
1077
                case MODE_INTER_PRIOR_LAST:
1078
                    /* all 6 fragments use the motion vector prior to the
1079
                     * last motion vector */
1080
                    motion_x[0] = prior_last_motion_x;
1081
                    motion_y[0] = prior_last_motion_y;
1082
                    for (k = 1; k < 6; k++) {
1083
                        motion_x[k] = motion_x[0];
1084
                        motion_y[k] = motion_y[0];
1085
                    }
1086

    
1087
                    /* vector maintenance */
1088
                    prior_last_motion_x = last_motion_x;
1089
                    prior_last_motion_y = last_motion_y;
1090
                    last_motion_x = motion_x[0];
1091
                    last_motion_y = motion_y[0];
1092
                    break;
1093

    
1094
                default:
1095
                    /* covers intra, inter without MV, golden without MV */
1096
                    memset(motion_x, 0, 6 * sizeof(int));
1097
                    memset(motion_y, 0, 6 * sizeof(int));
1098

    
1099
                    /* no vector maintenance */
1100
                    break;
1101
                }
1102

    
1103
                /* assign the motion vectors to the correct fragments */
1104
                debug_vectors("    vectors for macroblock starting @ fragment %d (coding method %d):\n",
1105
                    current_fragment,
1106
                    s->macroblock_coding[current_macroblock]);
1107
                for (k = 0; k < 6; k++) {
1108
                    current_fragment =
1109
                        s->macroblock_fragments[current_macroblock * 6 + k];
1110
                    if (current_fragment == -1)
1111
                        continue;
1112
                    if (current_fragment >= s->fragment_count) {
1113
                        av_log(s->avctx, AV_LOG_ERROR, "  vp3:unpack_vectors(): bad fragment number (%d >= %d)\n",
1114
                            current_fragment, s->fragment_count);
1115
                        return 1;
1116
                    }
1117
                    s->all_fragments[current_fragment].motion_x = motion_x[k];
1118
                    s->all_fragments[current_fragment].motion_y = motion_y[k];
1119
                    debug_vectors("    vector %d: fragment %d = (%d, %d)\n",
1120
                        k, current_fragment, motion_x[k], motion_y[k]);
1121
                }
1122
            }
1123
        }
1124
    }
1125

    
1126
    return 0;
1127
}
1128

    
1129
/*
1130
 * This function is called by unpack_dct_coeffs() to extract the VLCs from
1131
 * the bitstream. The VLCs encode tokens which are used to unpack DCT
1132
 * data. This function unpacks all the VLCs for either the Y plane or both
1133
 * C planes, and is called for DC coefficients or different AC coefficient
1134
 * levels (since different coefficient types require different VLC tables.
1135
 *
1136
 * This function returns a residual eob run. E.g, if a particular token gave
1137
 * instructions to EOB the next 5 fragments and there were only 2 fragments
1138
 * left in the current fragment range, 3 would be returned so that it could
1139
 * be passed into the next call to this same function.
1140
 */
1141
static int unpack_vlcs(Vp3DecodeContext *s, GetBitContext *gb,
1142
                        VLC *table, int coeff_index,
1143
                        int first_fragment, int last_fragment,
1144
                        int eob_run)
1145
{
1146
    int i;
1147
    int token;
1148
    int zero_run = 0;
1149
    DCTELEM coeff = 0;
1150
    Vp3Fragment *fragment;
1151
    uint8_t *perm= s->scantable.permutated;
1152
    int bits_to_get;
1153

    
1154
    if ((first_fragment >= s->fragment_count) ||
1155
        (last_fragment >= s->fragment_count)) {
1156

    
1157
        av_log(s->avctx, AV_LOG_ERROR, "  vp3:unpack_vlcs(): bad fragment number (%d -> %d ?)\n",
1158
            first_fragment, last_fragment);
1159
        return 0;
1160
    }
1161

    
1162
    for (i = first_fragment; i <= last_fragment; i++) {
1163
        int fragment_num = s->coded_fragment_list[i];
1164

    
1165
        if (s->coeff_counts[fragment_num] > coeff_index)
1166
            continue;
1167
        fragment = &s->all_fragments[fragment_num];
1168

    
1169
        if (!eob_run) {
1170
            /* decode a VLC into a token */
1171
            token = get_vlc2(gb, table->table, 5, 3);
1172
            debug_vlc(" token = %2d, ", token);
1173
            /* use the token to get a zero run, a coefficient, and an eob run */
1174
            if (token <= 6) {
1175
                eob_run = eob_run_base[token];
1176
                if (eob_run_get_bits[token])
1177
                    eob_run += get_bits(gb, eob_run_get_bits[token]);
1178
                coeff = zero_run = 0;
1179
            } else {
1180
                bits_to_get = coeff_get_bits[token];
1181
                if (!bits_to_get)
1182
                    coeff = coeff_tables[token][0];
1183
                else
1184
                    coeff = coeff_tables[token][get_bits(gb, bits_to_get)];
1185

    
1186
                zero_run = zero_run_base[token];
1187
                if (zero_run_get_bits[token])
1188
                    zero_run += get_bits(gb, zero_run_get_bits[token]);
1189
            }
1190
        }
1191

    
1192
        if (!eob_run) {
1193
            s->coeff_counts[fragment_num] += zero_run;
1194
            if (s->coeff_counts[fragment_num] < 64){
1195
                fragment->next_coeff->coeff= coeff;
1196
                fragment->next_coeff->index= perm[s->coeff_counts[fragment_num]++]; //FIXME perm here already?
1197
                fragment->next_coeff->next= s->next_coeff;
1198
                s->next_coeff->next=NULL;
1199
                fragment->next_coeff= s->next_coeff++;
1200
            }
1201
            debug_vlc(" fragment %d coeff = %d\n",
1202
                s->coded_fragment_list[i], fragment->next_coeff[coeff_index]);
1203
        } else {
1204
            s->coeff_counts[fragment_num] |= 128;
1205
            debug_vlc(" fragment %d eob with %d coefficients\n",
1206
                s->coded_fragment_list[i], s->coeff_counts[fragment_num]&127);
1207
            eob_run--;
1208
        }
1209
    }
1210

    
1211
    return eob_run;
1212
}
1213

    
1214
/*
1215
 * This function unpacks all of the DCT coefficient data from the
1216
 * bitstream.
1217
 */
1218
static int unpack_dct_coeffs(Vp3DecodeContext *s, GetBitContext *gb)
1219
{
1220
    int i;
1221
    int dc_y_table;
1222
    int dc_c_table;
1223
    int ac_y_table;
1224
    int ac_c_table;
1225
    int residual_eob_run = 0;
1226

    
1227
    /* fetch the DC table indexes */
1228
    dc_y_table = get_bits(gb, 4);
1229
    dc_c_table = get_bits(gb, 4);
1230

    
1231
    /* unpack the Y plane DC coefficients */
1232
    debug_vp3("  vp3: unpacking Y plane DC coefficients using table %d\n",
1233
        dc_y_table);
1234
    residual_eob_run = unpack_vlcs(s, gb, &s->dc_vlc[dc_y_table], 0,
1235
        s->first_coded_y_fragment, s->last_coded_y_fragment, residual_eob_run);
1236

    
1237
    /* unpack the C plane DC coefficients */
1238
    debug_vp3("  vp3: unpacking C plane DC coefficients using table %d\n",
1239
        dc_c_table);
1240
    residual_eob_run = unpack_vlcs(s, gb, &s->dc_vlc[dc_c_table], 0,
1241
        s->first_coded_c_fragment, s->last_coded_c_fragment, residual_eob_run);
1242

    
1243
    /* fetch the AC table indexes */
1244
    ac_y_table = get_bits(gb, 4);
1245
    ac_c_table = get_bits(gb, 4);
1246

    
1247
    /* unpack the group 1 AC coefficients (coeffs 1-5) */
1248
    for (i = 1; i <= 5; i++) {
1249

    
1250
        debug_vp3("  vp3: unpacking level %d Y plane AC coefficients using table %d\n",
1251
            i, ac_y_table);
1252
        residual_eob_run = unpack_vlcs(s, gb, &s->ac_vlc_1[ac_y_table], i,
1253
            s->first_coded_y_fragment, s->last_coded_y_fragment, residual_eob_run);
1254

    
1255
        debug_vp3("  vp3: unpacking level %d C plane AC coefficients using table %d\n",
1256
            i, ac_c_table);
1257
        residual_eob_run = unpack_vlcs(s, gb, &s->ac_vlc_1[ac_c_table], i,
1258
            s->first_coded_c_fragment, s->last_coded_c_fragment, residual_eob_run);
1259
    }
1260

    
1261
    /* unpack the group 2 AC coefficients (coeffs 6-14) */
1262
    for (i = 6; i <= 14; i++) {
1263

    
1264
        debug_vp3("  vp3: unpacking level %d Y plane AC coefficients using table %d\n",
1265
            i, ac_y_table);
1266
        residual_eob_run = unpack_vlcs(s, gb, &s->ac_vlc_2[ac_y_table], i,
1267
            s->first_coded_y_fragment, s->last_coded_y_fragment, residual_eob_run);
1268

    
1269
        debug_vp3("  vp3: unpacking level %d C plane AC coefficients using table %d\n",
1270
            i, ac_c_table);
1271
        residual_eob_run = unpack_vlcs(s, gb, &s->ac_vlc_2[ac_c_table], i,
1272
            s->first_coded_c_fragment, s->last_coded_c_fragment, residual_eob_run);
1273
    }
1274

    
1275
    /* unpack the group 3 AC coefficients (coeffs 15-27) */
1276
    for (i = 15; i <= 27; i++) {
1277

    
1278
        debug_vp3("  vp3: unpacking level %d Y plane AC coefficients using table %d\n",
1279
            i, ac_y_table);
1280
        residual_eob_run = unpack_vlcs(s, gb, &s->ac_vlc_3[ac_y_table], i,
1281
            s->first_coded_y_fragment, s->last_coded_y_fragment, residual_eob_run);
1282

    
1283
        debug_vp3("  vp3: unpacking level %d C plane AC coefficients using table %d\n",
1284
            i, ac_c_table);
1285
        residual_eob_run = unpack_vlcs(s, gb, &s->ac_vlc_3[ac_c_table], i,
1286
            s->first_coded_c_fragment, s->last_coded_c_fragment, residual_eob_run);
1287
    }
1288

    
1289
    /* unpack the group 4 AC coefficients (coeffs 28-63) */
1290
    for (i = 28; i <= 63; i++) {
1291

    
1292
        debug_vp3("  vp3: unpacking level %d Y plane AC coefficients using table %d\n",
1293
            i, ac_y_table);
1294
        residual_eob_run = unpack_vlcs(s, gb, &s->ac_vlc_4[ac_y_table], i,
1295
            s->first_coded_y_fragment, s->last_coded_y_fragment, residual_eob_run);
1296

    
1297
        debug_vp3("  vp3: unpacking level %d C plane AC coefficients using table %d\n",
1298
            i, ac_c_table);
1299
        residual_eob_run = unpack_vlcs(s, gb, &s->ac_vlc_4[ac_c_table], i,
1300
            s->first_coded_c_fragment, s->last_coded_c_fragment, residual_eob_run);
1301
    }
1302

    
1303
    return 0;
1304
}
1305

    
1306
/*
1307
 * This function reverses the DC prediction for each coded fragment in
1308
 * the frame. Much of this function is adapted directly from the original
1309
 * VP3 source code.
1310
 */
1311
#define COMPATIBLE_FRAME(x) \
1312
  (compatible_frame[s->all_fragments[x].coding_method] == current_frame_type)
1313
#define FRAME_CODED(x) (s->all_fragments[x].coding_method != MODE_COPY)
1314
#define DC_COEFF(u) (s->coeffs[u].index ? 0 : s->coeffs[u].coeff) //FIXME do somethin to simplify this
1315

    
1316
static void reverse_dc_prediction(Vp3DecodeContext *s,
1317
                                  int first_fragment,
1318
                                  int fragment_width,
1319
                                  int fragment_height)
1320
{
1321

    
1322
#define PUL 8
1323
#define PU 4
1324
#define PUR 2
1325
#define PL 1
1326

    
1327
    int x, y;
1328
    int i = first_fragment;
1329

    
1330
    int predicted_dc;
1331

    
1332
    /* DC values for the left, up-left, up, and up-right fragments */
1333
    int vl, vul, vu, vur;
1334

    
1335
    /* indexes for the left, up-left, up, and up-right fragments */
1336
    int l, ul, u, ur;
1337

    
1338
    /*
1339
     * The 6 fields mean:
1340
     *   0: up-left multiplier
1341
     *   1: up multiplier
1342
     *   2: up-right multiplier
1343
     *   3: left multiplier
1344
     */
1345
    int predictor_transform[16][4] = {
1346
        {  0,  0,  0,  0},
1347
        {  0,  0,  0,128},        // PL
1348
        {  0,  0,128,  0},        // PUR
1349
        {  0,  0, 53, 75},        // PUR|PL
1350
        {  0,128,  0,  0},        // PU
1351
        {  0, 64,  0, 64},        // PU|PL
1352
        {  0,128,  0,  0},        // PU|PUR
1353
        {  0,  0, 53, 75},        // PU|PUR|PL
1354
        {128,  0,  0,  0},        // PUL
1355
        {  0,  0,  0,128},        // PUL|PL
1356
        { 64,  0, 64,  0},        // PUL|PUR
1357
        {  0,  0, 53, 75},        // PUL|PUR|PL
1358
        {  0,128,  0,  0},        // PUL|PU
1359
       {-104,116,  0,116},        // PUL|PU|PL
1360
        { 24, 80, 24,  0},        // PUL|PU|PUR
1361
       {-104,116,  0,116}         // PUL|PU|PUR|PL
1362
    };
1363

    
1364
    /* This table shows which types of blocks can use other blocks for
1365
     * prediction. For example, INTRA is the only mode in this table to
1366
     * have a frame number of 0. That means INTRA blocks can only predict
1367
     * from other INTRA blocks. There are 2 golden frame coding types;
1368
     * blocks encoding in these modes can only predict from other blocks
1369
     * that were encoded with these 1 of these 2 modes. */
1370
    unsigned char compatible_frame[8] = {
1371
        1,    /* MODE_INTER_NO_MV */
1372
        0,    /* MODE_INTRA */
1373
        1,    /* MODE_INTER_PLUS_MV */
1374
        1,    /* MODE_INTER_LAST_MV */
1375
        1,    /* MODE_INTER_PRIOR_MV */
1376
        2,    /* MODE_USING_GOLDEN */
1377
        2,    /* MODE_GOLDEN_MV */
1378
        1     /* MODE_INTER_FOUR_MV */
1379
    };
1380
    int current_frame_type;
1381

    
1382
    /* there is a last DC predictor for each of the 3 frame types */
1383
    short last_dc[3];
1384

    
1385
    int transform = 0;
1386

    
1387
    debug_vp3("  vp3: reversing DC prediction\n");
1388

    
1389
    vul = vu = vur = vl = 0;
1390
    last_dc[0] = last_dc[1] = last_dc[2] = 0;
1391

    
1392
    /* for each fragment row... */
1393
    for (y = 0; y < fragment_height; y++) {
1394

    
1395
        /* for each fragment in a row... */
1396
        for (x = 0; x < fragment_width; x++, i++) {
1397

    
1398
            /* reverse prediction if this block was coded */
1399
            if (s->all_fragments[i].coding_method != MODE_COPY) {
1400

    
1401
                current_frame_type =
1402
                    compatible_frame[s->all_fragments[i].coding_method];
1403
                debug_dc_pred(" frag %d: orig DC = %d, ",
1404
                    i, DC_COEFF(i));
1405

    
1406
                transform= 0;
1407
                if(x){
1408
                    l= i-1;
1409
                    vl = DC_COEFF(l);
1410
                    if(FRAME_CODED(l) && COMPATIBLE_FRAME(l))
1411
                        transform |= PL;
1412
                }
1413
                if(y){
1414
                    u= i-fragment_width;
1415
                    vu = DC_COEFF(u);
1416
                    if(FRAME_CODED(u) && COMPATIBLE_FRAME(u))
1417
                        transform |= PU;
1418
                    if(x){
1419
                        ul= i-fragment_width-1;
1420
                        vul = DC_COEFF(ul);
1421
                        if(FRAME_CODED(ul) && COMPATIBLE_FRAME(ul))
1422
                            transform |= PUL;
1423
                    }
1424
                    if(x + 1 < fragment_width){
1425
                        ur= i-fragment_width+1;
1426
                        vur = DC_COEFF(ur);
1427
                        if(FRAME_CODED(ur) && COMPATIBLE_FRAME(ur))
1428
                            transform |= PUR;
1429
                    }
1430
                }
1431

    
1432
                debug_dc_pred("transform = %d, ", transform);
1433

    
1434
                if (transform == 0) {
1435

    
1436
                    /* if there were no fragments to predict from, use last
1437
                     * DC saved */
1438
                    predicted_dc = last_dc[current_frame_type];
1439
                    debug_dc_pred("from last DC (%d) = %d\n",
1440
                        current_frame_type, DC_COEFF(i));
1441

    
1442
                } else {
1443

    
1444
                    /* apply the appropriate predictor transform */
1445
                    predicted_dc =
1446
                        (predictor_transform[transform][0] * vul) +
1447
                        (predictor_transform[transform][1] * vu) +
1448
                        (predictor_transform[transform][2] * vur) +
1449
                        (predictor_transform[transform][3] * vl);
1450

    
1451
                    predicted_dc /= 128;
1452

    
1453
                    /* check for outranging on the [ul u l] and
1454
                     * [ul u ur l] predictors */
1455
                    if ((transform == 13) || (transform == 15)) {
1456
                        if (FFABS(predicted_dc - vu) > 128)
1457
                            predicted_dc = vu;
1458
                        else if (FFABS(predicted_dc - vl) > 128)
1459
                            predicted_dc = vl;
1460
                        else if (FFABS(predicted_dc - vul) > 128)
1461
                            predicted_dc = vul;
1462
                    }
1463

    
1464
                    debug_dc_pred("from pred DC = %d\n",
1465
                    DC_COEFF(i));
1466
                }
1467

    
1468
                /* at long last, apply the predictor */
1469
                if(s->coeffs[i].index){
1470
                    *s->next_coeff= s->coeffs[i];
1471
                    s->coeffs[i].index=0;
1472
                    s->coeffs[i].coeff=0;
1473
                    s->coeffs[i].next= s->next_coeff++;
1474
                }
1475
                s->coeffs[i].coeff += predicted_dc;
1476
                /* save the DC */
1477
                last_dc[current_frame_type] = DC_COEFF(i);
1478
                if(DC_COEFF(i) && !(s->coeff_counts[i]&127)){
1479
                    s->coeff_counts[i]= 129;
1480
//                    s->all_fragments[i].next_coeff= s->next_coeff;
1481
                    s->coeffs[i].next= s->next_coeff;
1482
                    (s->next_coeff++)->next=NULL;
1483
                }
1484
            }
1485
        }
1486
    }
1487
}
1488

    
1489

    
1490
static void horizontal_filter(unsigned char *first_pixel, int stride,
1491
    int *bounding_values);
1492
static void vertical_filter(unsigned char *first_pixel, int stride,
1493
    int *bounding_values);
1494

    
1495
/*
1496
 * Perform the final rendering for a particular slice of data.
1497
 * The slice number ranges from 0..(macroblock_height - 1).
1498
 */
1499
static void render_slice(Vp3DecodeContext *s, int slice)
1500
{
1501
    int x;
1502
    int m, n;
1503
    int16_t *dequantizer;
1504
    DECLARE_ALIGNED_16(DCTELEM, block[64]);
1505
    int motion_x = 0xdeadbeef, motion_y = 0xdeadbeef;
1506
    int motion_halfpel_index;
1507
    uint8_t *motion_source;
1508
    int plane;
1509
    int current_macroblock_entry = slice * s->macroblock_width * 6;
1510

    
1511
    if (slice >= s->macroblock_height)
1512
        return;
1513

    
1514
    for (plane = 0; plane < 3; plane++) {
1515
        uint8_t *output_plane = s->current_frame.data    [plane];
1516
        uint8_t *  last_plane = s->   last_frame.data    [plane];
1517
        uint8_t *golden_plane = s-> golden_frame.data    [plane];
1518
        int stride            = s->current_frame.linesize[plane];
1519
        int plane_width       = s->width  >> !!plane;
1520
        int plane_height      = s->height >> !!plane;
1521
        int y =        slice *  FRAGMENT_PIXELS << !plane ;
1522
        int slice_height = y + (FRAGMENT_PIXELS << !plane);
1523
        int i = s->macroblock_fragments[current_macroblock_entry + plane + 3*!!plane];
1524

    
1525
        if (!s->flipped_image) stride = -stride;
1526

    
1527

    
1528
        if(FFABS(stride) > 2048)
1529
            return; //various tables are fixed size
1530

    
1531
        /* for each fragment row in the slice (both of them)... */
1532
        for (; y < slice_height; y += 8) {
1533

    
1534
            /* for each fragment in a row... */
1535
            for (x = 0; x < plane_width; x += 8, i++) {
1536

    
1537
                if ((i < 0) || (i >= s->fragment_count)) {
1538
                    av_log(s->avctx, AV_LOG_ERROR, "  vp3:render_slice(): bad fragment number (%d)\n", i);
1539
                    return;
1540
                }
1541

    
1542
                /* transform if this block was coded */
1543
                if ((s->all_fragments[i].coding_method != MODE_COPY) &&
1544
                    !((s->avctx->flags & CODEC_FLAG_GRAY) && plane)) {
1545

    
1546
                    if ((s->all_fragments[i].coding_method == MODE_USING_GOLDEN) ||
1547
                        (s->all_fragments[i].coding_method == MODE_GOLDEN_MV))
1548
                        motion_source= golden_plane;
1549
                    else
1550
                        motion_source= last_plane;
1551

    
1552
                    motion_source += s->all_fragments[i].first_pixel;
1553
                    motion_halfpel_index = 0;
1554

    
1555
                    /* sort out the motion vector if this fragment is coded
1556
                     * using a motion vector method */
1557
                    if ((s->all_fragments[i].coding_method > MODE_INTRA) &&
1558
                        (s->all_fragments[i].coding_method != MODE_USING_GOLDEN)) {
1559
                        int src_x, src_y;
1560
                        motion_x = s->all_fragments[i].motion_x;
1561
                        motion_y = s->all_fragments[i].motion_y;
1562
                        if(plane){
1563
                            motion_x= (motion_x>>1) | (motion_x&1);
1564
                            motion_y= (motion_y>>1) | (motion_y&1);
1565
                        }
1566

    
1567
                        src_x= (motion_x>>1) + x;
1568
                        src_y= (motion_y>>1) + y;
1569
                        if ((motion_x == 127) || (motion_y == 127))
1570
                            av_log(s->avctx, AV_LOG_ERROR, " help! got invalid motion vector! (%X, %X)\n", motion_x, motion_y);
1571

    
1572
                        motion_halfpel_index = motion_x & 0x01;
1573
                        motion_source += (motion_x >> 1);
1574

    
1575
                        motion_halfpel_index |= (motion_y & 0x01) << 1;
1576
                        motion_source += ((motion_y >> 1) * stride);
1577

    
1578
                        if(src_x<0 || src_y<0 || src_x + 9 >= plane_width || src_y + 9 >= plane_height){
1579
                            uint8_t *temp= s->edge_emu_buffer;
1580
                            if(stride<0) temp -= 9*stride;
1581
                            else temp += 9*stride;
1582

    
1583
                            ff_emulated_edge_mc(temp, motion_source, stride, 9, 9, src_x, src_y, plane_width, plane_height);
1584
                            motion_source= temp;
1585
                        }
1586
                    }
1587

    
1588

    
1589
                    /* first, take care of copying a block from either the
1590
                     * previous or the golden frame */
1591
                    if (s->all_fragments[i].coding_method != MODE_INTRA) {
1592
                        /* Note, it is possible to implement all MC cases with
1593
                           put_no_rnd_pixels_l2 which would look more like the
1594
                           VP3 source but this would be slower as
1595
                           put_no_rnd_pixels_tab is better optimzed */
1596
                        if(motion_halfpel_index != 3){
1597
                            s->dsp.put_no_rnd_pixels_tab[1][motion_halfpel_index](
1598
                                output_plane + s->all_fragments[i].first_pixel,
1599
                                motion_source, stride, 8);
1600
                        }else{
1601
                            int d= (motion_x ^ motion_y)>>31; // d is 0 if motion_x and _y have the same sign, else -1
1602
                            s->dsp.put_no_rnd_pixels_l2[1](
1603
                                output_plane + s->all_fragments[i].first_pixel,
1604
                                motion_source - d,
1605
                                motion_source + stride + 1 + d,
1606
                                stride, 8);
1607
                        }
1608
                        dequantizer = s->qmat[1][plane];
1609
                    }else{
1610
                        dequantizer = s->qmat[0][plane];
1611
                    }
1612

    
1613
                    /* dequantize the DCT coefficients */
1614
                    debug_idct("fragment %d, coding mode %d, DC = %d, dequant = %d:\n",
1615
                        i, s->all_fragments[i].coding_method,
1616
                        DC_COEFF(i), dequantizer[0]);
1617

    
1618
                    if(s->avctx->idct_algo==FF_IDCT_VP3){
1619
                        Coeff *coeff= s->coeffs + i;
1620
                        memset(block, 0, sizeof(block));
1621
                        while(coeff->next){
1622
                            block[coeff->index]= coeff->coeff * dequantizer[coeff->index];
1623
                            coeff= coeff->next;
1624
                        }
1625
                    }else{
1626
                        Coeff *coeff= s->coeffs + i;
1627
                        memset(block, 0, sizeof(block));
1628
                        while(coeff->next){
1629
                            block[coeff->index]= (coeff->coeff * dequantizer[coeff->index] + 2)>>2;
1630
                            coeff= coeff->next;
1631
                        }
1632
                    }
1633

    
1634
                    /* invert DCT and place (or add) in final output */
1635

    
1636
                    if (s->all_fragments[i].coding_method == MODE_INTRA) {
1637
                        if(s->avctx->idct_algo!=FF_IDCT_VP3)
1638
                            block[0] += 128<<3;
1639
                        s->dsp.idct_put(
1640
                            output_plane + s->all_fragments[i].first_pixel,
1641
                            stride,
1642
                            block);
1643
                    } else {
1644
                        s->dsp.idct_add(
1645
                            output_plane + s->all_fragments[i].first_pixel,
1646
                            stride,
1647
                            block);
1648
                    }
1649

    
1650
                    debug_idct("block after idct_%s():\n",
1651
                        (s->all_fragments[i].coding_method == MODE_INTRA)?
1652
                        "put" : "add");
1653
                    for (m = 0; m < 8; m++) {
1654
                        for (n = 0; n < 8; n++) {
1655
                            debug_idct(" %3d", *(output_plane +
1656
                                s->all_fragments[i].first_pixel + (m * stride + n)));
1657
                        }
1658
                        debug_idct("\n");
1659
                    }
1660
                    debug_idct("\n");
1661

    
1662
                } else {
1663

    
1664
                    /* copy directly from the previous frame */
1665
                    s->dsp.put_pixels_tab[1][0](
1666
                        output_plane + s->all_fragments[i].first_pixel,
1667
                        last_plane + s->all_fragments[i].first_pixel,
1668
                        stride, 8);
1669

    
1670
                }
1671
#if 0
1672
                /* perform the left edge filter if:
1673
                 *   - the fragment is not on the left column
1674
                 *   - the fragment is coded in this frame
1675
                 *   - the fragment is not coded in this frame but the left
1676
                 *     fragment is coded in this frame (this is done instead
1677
                 *     of a right edge filter when rendering the left fragment
1678
                 *     since this fragment is not available yet) */
1679
                if ((x > 0) &&
1680
                    ((s->all_fragments[i].coding_method != MODE_COPY) ||
1681
                     ((s->all_fragments[i].coding_method == MODE_COPY) &&
1682
                      (s->all_fragments[i - 1].coding_method != MODE_COPY)) )) {
1683
                    horizontal_filter(
1684
                        output_plane + s->all_fragments[i].first_pixel + 7*stride,
1685
                        -stride, s->bounding_values_array + 127);
1686
                }
1687

1688
                /* perform the top edge filter if:
1689
                 *   - the fragment is not on the top row
1690
                 *   - the fragment is coded in this frame
1691
                 *   - the fragment is not coded in this frame but the above
1692
                 *     fragment is coded in this frame (this is done instead
1693
                 *     of a bottom edge filter when rendering the above
1694
                 *     fragment since this fragment is not available yet) */
1695
                if ((y > 0) &&
1696
                    ((s->all_fragments[i].coding_method != MODE_COPY) ||
1697
                     ((s->all_fragments[i].coding_method == MODE_COPY) &&
1698
                      (s->all_fragments[i - fragment_width].coding_method != MODE_COPY)) )) {
1699
                    vertical_filter(
1700
                        output_plane + s->all_fragments[i].first_pixel - stride,
1701
                        -stride, s->bounding_values_array + 127);
1702
                }
1703
#endif
1704
            }
1705
        }
1706
    }
1707

    
1708
     /* this looks like a good place for slice dispatch... */
1709
     /* algorithm:
1710
      *   if (slice == s->macroblock_height - 1)
1711
      *     dispatch (both last slice & 2nd-to-last slice);
1712
      *   else if (slice > 0)
1713
      *     dispatch (slice - 1);
1714
      */
1715

    
1716
    emms_c();
1717
}
1718

    
1719
static void horizontal_filter(unsigned char *first_pixel, int stride,
1720
    int *bounding_values)
1721
{
1722
    unsigned char *end;
1723
    int filter_value;
1724

    
1725
    for (end= first_pixel + 8*stride; first_pixel != end; first_pixel += stride) {
1726
        filter_value =
1727
            (first_pixel[-2] - first_pixel[ 1])
1728
         +3*(first_pixel[ 0] - first_pixel[-1]);
1729
        filter_value = bounding_values[(filter_value + 4) >> 3];
1730
        first_pixel[-1] = av_clip_uint8(first_pixel[-1] + filter_value);
1731
        first_pixel[ 0] = av_clip_uint8(first_pixel[ 0] - filter_value);
1732
    }
1733
}
1734

    
1735
static void vertical_filter(unsigned char *first_pixel, int stride,
1736
    int *bounding_values)
1737
{
1738
    unsigned char *end;
1739
    int filter_value;
1740
    const int nstride= -stride;
1741

    
1742
    for (end= first_pixel + 8; first_pixel < end; first_pixel++) {
1743
        filter_value =
1744
            (first_pixel[2 * nstride] - first_pixel[ stride])
1745
         +3*(first_pixel[0          ] - first_pixel[nstride]);
1746
        filter_value = bounding_values[(filter_value + 4) >> 3];
1747
        first_pixel[nstride] = av_clip_uint8(first_pixel[nstride] + filter_value);
1748
        first_pixel[0] = av_clip_uint8(first_pixel[0] - filter_value);
1749
    }
1750
}
1751

    
1752
static void apply_loop_filter(Vp3DecodeContext *s)
1753
{
1754
    int plane;
1755
    int x, y;
1756
    int *bounding_values= s->bounding_values_array+127;
1757

    
1758
#if 0
1759
    int bounding_values_array[256];
1760
    int filter_limit;
1761

1762
    /* find the right loop limit value */
1763
    for (x = 63; x >= 0; x--) {
1764
        if (vp31_ac_scale_factor[x] >= s->quality_index)
1765
            break;
1766
    }
1767
    filter_limit = vp31_filter_limit_values[s->quality_index];
1768

1769
    /* set up the bounding values */
1770
    memset(bounding_values_array, 0, 256 * sizeof(int));
1771
    for (x = 0; x < filter_limit; x++) {
1772
        bounding_values[-x - filter_limit] = -filter_limit + x;
1773
        bounding_values[-x] = -x;
1774
        bounding_values[x] = x;
1775
        bounding_values[x + filter_limit] = filter_limit - x;
1776
    }
1777
#endif
1778

    
1779
    for (plane = 0; plane < 3; plane++) {
1780
        int width           = s->fragment_width  >> !!plane;
1781
        int height          = s->fragment_height >> !!plane;
1782
        int fragment        = s->fragment_start        [plane];
1783
        int stride          = s->current_frame.linesize[plane];
1784
        uint8_t *plane_data = s->current_frame.data    [plane];
1785
        if (!s->flipped_image) stride = -stride;
1786

    
1787
        for (y = 0; y < height; y++) {
1788

    
1789
            for (x = 0; x < width; x++) {
1790
START_TIMER
1791
                /* do not perform left edge filter for left columns frags */
1792
                if ((x > 0) &&
1793
                    (s->all_fragments[fragment].coding_method != MODE_COPY)) {
1794
                    horizontal_filter(
1795
                        plane_data + s->all_fragments[fragment].first_pixel,
1796
                        stride, bounding_values);
1797
                }
1798

    
1799
                /* do not perform top edge filter for top row fragments */
1800
                if ((y > 0) &&
1801
                    (s->all_fragments[fragment].coding_method != MODE_COPY)) {
1802
                    vertical_filter(
1803
                        plane_data + s->all_fragments[fragment].first_pixel,
1804
                        stride, bounding_values);
1805
                }
1806

    
1807
                /* do not perform right edge filter for right column
1808
                 * fragments or if right fragment neighbor is also coded
1809
                 * in this frame (it will be filtered in next iteration) */
1810
                if ((x < width - 1) &&
1811
                    (s->all_fragments[fragment].coding_method != MODE_COPY) &&
1812
                    (s->all_fragments[fragment + 1].coding_method == MODE_COPY)) {
1813
                    horizontal_filter(
1814
                        plane_data + s->all_fragments[fragment + 1].first_pixel,
1815
                        stride, bounding_values);
1816
                }
1817

    
1818
                /* do not perform bottom edge filter for bottom row
1819
                 * fragments or if bottom fragment neighbor is also coded
1820
                 * in this frame (it will be filtered in the next row) */
1821
                if ((y < height - 1) &&
1822
                    (s->all_fragments[fragment].coding_method != MODE_COPY) &&
1823
                    (s->all_fragments[fragment + width].coding_method == MODE_COPY)) {
1824
                    vertical_filter(
1825
                        plane_data + s->all_fragments[fragment + width].first_pixel,
1826
                        stride, bounding_values);
1827
                }
1828

    
1829
                fragment++;
1830
STOP_TIMER("loop filter")
1831
            }
1832
        }
1833
    }
1834
}
1835

    
1836
/*
1837
 * This function computes the first pixel addresses for each fragment.
1838
 * This function needs to be invoked after the first frame is allocated
1839
 * so that it has access to the plane strides.
1840
 */
1841
static void vp3_calculate_pixel_addresses(Vp3DecodeContext *s)
1842
{
1843

    
1844
    int i, x, y;
1845

    
1846
    /* figure out the first pixel addresses for each of the fragments */
1847
    /* Y plane */
1848
    i = 0;
1849
    for (y = s->fragment_height; y > 0; y--) {
1850
        for (x = 0; x < s->fragment_width; x++) {
1851
            s->all_fragments[i++].first_pixel =
1852
                s->golden_frame.linesize[0] * y * FRAGMENT_PIXELS -
1853
                    s->golden_frame.linesize[0] +
1854
                    x * FRAGMENT_PIXELS;
1855
            debug_init("  fragment %d, first pixel @ %d\n",
1856
                i-1, s->all_fragments[i-1].first_pixel);
1857
        }
1858
    }
1859

    
1860
    /* U plane */
1861
    i = s->fragment_start[1];
1862
    for (y = s->fragment_height / 2; y > 0; y--) {
1863
        for (x = 0; x < s->fragment_width / 2; x++) {
1864
            s->all_fragments[i++].first_pixel =
1865
                s->golden_frame.linesize[1] * y * FRAGMENT_PIXELS -
1866
                    s->golden_frame.linesize[1] +
1867
                    x * FRAGMENT_PIXELS;
1868
            debug_init("  fragment %d, first pixel @ %d\n",
1869
                i-1, s->all_fragments[i-1].first_pixel);
1870
        }
1871
    }
1872

    
1873
    /* V plane */
1874
    i = s->fragment_start[2];
1875
    for (y = s->fragment_height / 2; y > 0; y--) {
1876
        for (x = 0; x < s->fragment_width / 2; x++) {
1877
            s->all_fragments[i++].first_pixel =
1878
                s->golden_frame.linesize[2] * y * FRAGMENT_PIXELS -
1879
                    s->golden_frame.linesize[2] +
1880
                    x * FRAGMENT_PIXELS;
1881
            debug_init("  fragment %d, first pixel @ %d\n",
1882
                i-1, s->all_fragments[i-1].first_pixel);
1883
        }
1884
    }
1885
}
1886

    
1887
/* FIXME: this should be merged with the above! */
1888
static void theora_calculate_pixel_addresses(Vp3DecodeContext *s)
1889
{
1890

    
1891
    int i, x, y;
1892

    
1893
    /* figure out the first pixel addresses for each of the fragments */
1894
    /* Y plane */
1895
    i = 0;
1896
    for (y = 1; y <= s->fragment_height; y++) {
1897
        for (x = 0; x < s->fragment_width; x++) {
1898
            s->all_fragments[i++].first_pixel =
1899
                s->golden_frame.linesize[0] * y * FRAGMENT_PIXELS -
1900
                    s->golden_frame.linesize[0] +
1901
                    x * FRAGMENT_PIXELS;
1902
            debug_init("  fragment %d, first pixel @ %d\n",
1903
                i-1, s->all_fragments[i-1].first_pixel);
1904
        }
1905
    }
1906

    
1907
    /* U plane */
1908
    i = s->fragment_start[1];
1909
    for (y = 1; y <= s->fragment_height / 2; y++) {
1910
        for (x = 0; x < s->fragment_width / 2; x++) {
1911
            s->all_fragments[i++].first_pixel =
1912
                s->golden_frame.linesize[1] * y * FRAGMENT_PIXELS -
1913
                    s->golden_frame.linesize[1] +
1914
                    x * FRAGMENT_PIXELS;
1915
            debug_init("  fragment %d, first pixel @ %d\n",
1916
                i-1, s->all_fragments[i-1].first_pixel);
1917
        }
1918
    }
1919

    
1920
    /* V plane */
1921
    i = s->fragment_start[2];
1922
    for (y = 1; y <= s->fragment_height / 2; y++) {
1923
        for (x = 0; x < s->fragment_width / 2; x++) {
1924
            s->all_fragments[i++].first_pixel =
1925
                s->golden_frame.linesize[2] * y * FRAGMENT_PIXELS -
1926
                    s->golden_frame.linesize[2] +
1927
                    x * FRAGMENT_PIXELS;
1928
            debug_init("  fragment %d, first pixel @ %d\n",
1929
                i-1, s->all_fragments[i-1].first_pixel);
1930
        }
1931
    }
1932
}
1933

    
1934
/*
1935
 * This is the ffmpeg/libavcodec API init function.
1936
 */
1937
static av_cold int vp3_decode_init(AVCodecContext *avctx)
1938
{
1939
    Vp3DecodeContext *s = avctx->priv_data;
1940
    int i, inter, plane;
1941
    int c_width;
1942
    int c_height;
1943
    int y_superblock_count;
1944
    int c_superblock_count;
1945

    
1946
    if (avctx->codec_tag == MKTAG('V','P','3','0'))
1947
        s->version = 0;
1948
    else
1949
        s->version = 1;
1950

    
1951
    s->avctx = avctx;
1952
    s->width = (avctx->width + 15) & 0xFFFFFFF0;
1953
    s->height = (avctx->height + 15) & 0xFFFFFFF0;
1954
    avctx->pix_fmt = PIX_FMT_YUV420P;
1955
    if(avctx->idct_algo==FF_IDCT_AUTO)
1956
        avctx->idct_algo=FF_IDCT_VP3;
1957
    dsputil_init(&s->dsp, avctx);
1958

    
1959
    ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
1960

    
1961
    /* initialize to an impossible value which will force a recalculation
1962
     * in the first frame decode */
1963
    s->quality_index = -1;
1964

    
1965
    s->y_superblock_width = (s->width + 31) / 32;
1966
    s->y_superblock_height = (s->height + 31) / 32;
1967
    y_superblock_count = s->y_superblock_width * s->y_superblock_height;
1968

    
1969
    /* work out the dimensions for the C planes */
1970
    c_width = s->width / 2;
1971
    c_height = s->height / 2;
1972
    s->c_superblock_width = (c_width + 31) / 32;
1973
    s->c_superblock_height = (c_height + 31) / 32;
1974
    c_superblock_count = s->c_superblock_width * s->c_superblock_height;
1975

    
1976
    s->superblock_count = y_superblock_count + (c_superblock_count * 2);
1977
    s->u_superblock_start = y_superblock_count;
1978
    s->v_superblock_start = s->u_superblock_start + c_superblock_count;
1979
    s->superblock_coding = av_malloc(s->superblock_count);
1980

    
1981
    s->macroblock_width = (s->width + 15) / 16;
1982
    s->macroblock_height = (s->height + 15) / 16;
1983
    s->macroblock_count = s->macroblock_width * s->macroblock_height;
1984

    
1985
    s->fragment_width = s->width / FRAGMENT_PIXELS;
1986
    s->fragment_height = s->height / FRAGMENT_PIXELS;
1987

    
1988
    /* fragment count covers all 8x8 blocks for all 3 planes */
1989
    s->fragment_count = s->fragment_width * s->fragment_height * 3 / 2;
1990
    s->fragment_start[1] = s->fragment_width * s->fragment_height;
1991
    s->fragment_start[2] = s->fragment_width * s->fragment_height * 5 / 4;
1992

    
1993
    debug_init("  Y plane: %d x %d\n", s->width, s->height);
1994
    debug_init("  C plane: %d x %d\n", c_width, c_height);
1995
    debug_init("  Y superblocks: %d x %d, %d total\n",
1996
        s->y_superblock_width, s->y_superblock_height, y_superblock_count);
1997
    debug_init("  C superblocks: %d x %d, %d total\n",
1998
        s->c_superblock_width, s->c_superblock_height, c_superblock_count);
1999
    debug_init("  total superblocks = %d, U starts @ %d, V starts @ %d\n",
2000
        s->superblock_count, s->u_superblock_start, s->v_superblock_start);
2001
    debug_init("  macroblocks: %d x %d, %d total\n",
2002
        s->macroblock_width, s->macroblock_height, s->macroblock_count);
2003
    debug_init("  %d fragments, %d x %d, u starts @ %d, v starts @ %d\n",
2004
        s->fragment_count,
2005
        s->fragment_width,
2006
        s->fragment_height,
2007
        s->fragment_start[1],
2008
        s->fragment_start[2]);
2009

    
2010
    s->all_fragments = av_malloc(s->fragment_count * sizeof(Vp3Fragment));
2011
    s->coeff_counts = av_malloc(s->fragment_count * sizeof(*s->coeff_counts));
2012
    s->coeffs = av_malloc(s->fragment_count * sizeof(Coeff) * 65);
2013
    s->coded_fragment_list = av_malloc(s->fragment_count * sizeof(int));
2014
    s->pixel_addresses_initialized = 0;
2015

    
2016
    if (!s->theora_tables)
2017
    {
2018
        for (i = 0; i < 64; i++) {
2019
            s->coded_dc_scale_factor[i] = vp31_dc_scale_factor[i];
2020
            s->coded_ac_scale_factor[i] = vp31_ac_scale_factor[i];
2021
            s->base_matrix[0][i] = vp31_intra_y_dequant[i];
2022
            s->base_matrix[1][i] = vp31_intra_c_dequant[i];
2023
            s->base_matrix[2][i] = vp31_inter_dequant[i];
2024
            s->filter_limit_values[i] = vp31_filter_limit_values[i];
2025
        }
2026

    
2027
        for(inter=0; inter<2; inter++){
2028
            for(plane=0; plane<3; plane++){
2029
                s->qr_count[inter][plane]= 1;
2030
                s->qr_size [inter][plane][0]= 63;
2031
                s->qr_base [inter][plane][0]=
2032
                s->qr_base [inter][plane][1]= 2*inter + (!!plane)*!inter;
2033
            }
2034
        }
2035

    
2036
        /* init VLC tables */
2037
        for (i = 0; i < 16; i++) {
2038

    
2039
            /* DC histograms */
2040
            init_vlc(&s->dc_vlc[i], 5, 32,
2041
                &dc_bias[i][0][1], 4, 2,
2042
                &dc_bias[i][0][0], 4, 2, 0);
2043

    
2044
            /* group 1 AC histograms */
2045
            init_vlc(&s->ac_vlc_1[i], 5, 32,
2046
                &ac_bias_0[i][0][1], 4, 2,
2047
                &ac_bias_0[i][0][0], 4, 2, 0);
2048

    
2049
            /* group 2 AC histograms */
2050
            init_vlc(&s->ac_vlc_2[i], 5, 32,
2051
                &ac_bias_1[i][0][1], 4, 2,
2052
                &ac_bias_1[i][0][0], 4, 2, 0);
2053

    
2054
            /* group 3 AC histograms */
2055
            init_vlc(&s->ac_vlc_3[i], 5, 32,
2056
                &ac_bias_2[i][0][1], 4, 2,
2057
                &ac_bias_2[i][0][0], 4, 2, 0);
2058

    
2059
            /* group 4 AC histograms */
2060
            init_vlc(&s->ac_vlc_4[i], 5, 32,
2061
                &ac_bias_3[i][0][1], 4, 2,
2062
                &ac_bias_3[i][0][0], 4, 2, 0);
2063
        }
2064
    } else {
2065
        for (i = 0; i < 16; i++) {
2066

    
2067
            /* DC histograms */
2068
            init_vlc(&s->dc_vlc[i], 5, 32,
2069
                &s->huffman_table[i][0][1], 4, 2,
2070
                &s->huffman_table[i][0][0], 4, 2, 0);
2071

    
2072
            /* group 1 AC histograms */
2073
            init_vlc(&s->ac_vlc_1[i], 5, 32,
2074
                &s->huffman_table[i+16][0][1], 4, 2,
2075
                &s->huffman_table[i+16][0][0], 4, 2, 0);
2076

    
2077
            /* group 2 AC histograms */
2078
            init_vlc(&s->ac_vlc_2[i], 5, 32,
2079
                &s->huffman_table[i+16*2][0][1], 4, 2,
2080
                &s->huffman_table[i+16*2][0][0], 4, 2, 0);
2081

    
2082
            /* group 3 AC histograms */
2083
            init_vlc(&s->ac_vlc_3[i], 5, 32,
2084
                &s->huffman_table[i+16*3][0][1], 4, 2,
2085
                &s->huffman_table[i+16*3][0][0], 4, 2, 0);
2086

    
2087
            /* group 4 AC histograms */
2088
            init_vlc(&s->ac_vlc_4[i], 5, 32,
2089
                &s->huffman_table[i+16*4][0][1], 4, 2,
2090
                &s->huffman_table[i+16*4][0][0], 4, 2, 0);
2091
        }
2092
    }
2093

    
2094
    init_vlc(&s->superblock_run_length_vlc, 6, 34,
2095
        &superblock_run_length_vlc_table[0][1], 4, 2,
2096
        &superblock_run_length_vlc_table[0][0], 4, 2, 0);
2097

    
2098
    init_vlc(&s->fragment_run_length_vlc, 5, 30,
2099
        &fragment_run_length_vlc_table[0][1], 4, 2,
2100
        &fragment_run_length_vlc_table[0][0], 4, 2, 0);
2101

    
2102
    init_vlc(&s->mode_code_vlc, 3, 8,
2103
        &mode_code_vlc_table[0][1], 2, 1,
2104
        &mode_code_vlc_table[0][0], 2, 1, 0);
2105

    
2106
    init_vlc(&s->motion_vector_vlc, 6, 63,
2107
        &motion_vector_vlc_table[0][1], 2, 1,
2108
        &motion_vector_vlc_table[0][0], 2, 1, 0);
2109

    
2110
    /* work out the block mapping tables */
2111
    s->superblock_fragments = av_malloc(s->superblock_count * 16 * sizeof(int));
2112
    s->superblock_macroblocks = av_malloc(s->superblock_count * 4 * sizeof(int));
2113
    s->macroblock_fragments = av_malloc(s->macroblock_count * 6 * sizeof(int));
2114
    s->macroblock_coding = av_malloc(s->macroblock_count + 1);
2115
    init_block_mapping(s);
2116

    
2117
    for (i = 0; i < 3; i++) {
2118
        s->current_frame.data[i] = NULL;
2119
        s->last_frame.data[i] = NULL;
2120
        s->golden_frame.data[i] = NULL;
2121
    }
2122

    
2123
    return 0;
2124
}
2125

    
2126
/*
2127
 * This is the ffmpeg/libavcodec API frame decode function.
2128
 */
2129
static int vp3_decode_frame(AVCodecContext *avctx,
2130
                            void *data, int *data_size,
2131
                            const uint8_t *buf, int buf_size)
2132
{
2133
    Vp3DecodeContext *s = avctx->priv_data;
2134
    GetBitContext gb;
2135
    static int counter = 0;
2136
    int i;
2137

    
2138
    init_get_bits(&gb, buf, buf_size * 8);
2139

    
2140
    if (s->theora && get_bits1(&gb))
2141
    {
2142
        av_log(avctx, AV_LOG_ERROR, "Header packet passed to frame decoder, skipping\n");
2143
        return -1;
2144
    }
2145

    
2146
    s->keyframe = !get_bits1(&gb);
2147
    if (!s->theora)
2148
        skip_bits(&gb, 1);
2149
    s->last_quality_index = s->quality_index;
2150

    
2151
    s->nqis=0;
2152
    do{
2153
        s->qis[s->nqis++]= get_bits(&gb, 6);
2154
    } while(s->theora >= 0x030200 && s->nqis<3 && get_bits1(&gb));
2155

    
2156
    s->quality_index= s->qis[0];
2157

    
2158
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2159
        av_log(s->avctx, AV_LOG_INFO, " VP3 %sframe #%d: Q index = %d\n",
2160
            s->keyframe?"key":"", counter, s->quality_index);
2161
    counter++;
2162

    
2163
    if (s->quality_index != s->last_quality_index) {
2164
        init_dequantizer(s);
2165
        init_loop_filter(s);
2166
    }
2167

    
2168
    if (s->keyframe) {
2169
        if (!s->theora)
2170
        {
2171
            skip_bits(&gb, 4); /* width code */
2172
            skip_bits(&gb, 4); /* height code */
2173
            if (s->version)
2174
            {
2175
                s->version = get_bits(&gb, 5);
2176
                if (counter == 1)
2177
                    av_log(s->avctx, AV_LOG_DEBUG, "VP version: %d\n", s->version);
2178
            }
2179
        }
2180
        if (s->version || s->theora)
2181
        {
2182
                if (get_bits1(&gb))
2183
                    av_log(s->avctx, AV_LOG_ERROR, "Warning, unsupported keyframe coding type?!\n");
2184
            skip_bits(&gb, 2); /* reserved? */
2185
        }
2186

    
2187
        if (s->last_frame.data[0] == s->golden_frame.data[0]) {
2188
            if (s->golden_frame.data[0])
2189
                avctx->release_buffer(avctx, &s->golden_frame);
2190
            s->last_frame= s->golden_frame; /* ensure that we catch any access to this released frame */
2191
        } else {
2192
            if (s->golden_frame.data[0])
2193
                avctx->release_buffer(avctx, &s->golden_frame);
2194
            if (s->last_frame.data[0])
2195
                avctx->release_buffer(avctx, &s->last_frame);
2196
        }
2197

    
2198
        s->golden_frame.reference = 3;
2199
        if(avctx->get_buffer(avctx, &s->golden_frame) < 0) {
2200
            av_log(s->avctx, AV_LOG_ERROR, "vp3: get_buffer() failed\n");
2201
            return -1;
2202
        }
2203

    
2204
        /* golden frame is also the current frame */
2205
        s->current_frame= s->golden_frame;
2206

    
2207
        /* time to figure out pixel addresses? */
2208
        if (!s->pixel_addresses_initialized)
2209
        {
2210
            if (!s->flipped_image)
2211
                vp3_calculate_pixel_addresses(s);
2212
            else
2213
                theora_calculate_pixel_addresses(s);
2214
            s->pixel_addresses_initialized = 1;
2215
        }
2216
    } else {
2217
        /* allocate a new current frame */
2218
        s->current_frame.reference = 3;
2219
        if (!s->pixel_addresses_initialized) {
2220
            av_log(s->avctx, AV_LOG_ERROR, "vp3: first frame not a keyframe\n");
2221
            return -1;
2222
        }
2223
        if(avctx->get_buffer(avctx, &s->current_frame) < 0) {
2224
            av_log(s->avctx, AV_LOG_ERROR, "vp3: get_buffer() failed\n");
2225
            return -1;
2226
        }
2227
    }
2228

    
2229
    s->current_frame.qscale_table= s->qscale_table; //FIXME allocate individual tables per AVFrame
2230
    s->current_frame.qstride= 0;
2231

    
2232
    {START_TIMER
2233
    init_frame(s, &gb);
2234
    STOP_TIMER("init_frame")}
2235

    
2236
#if KEYFRAMES_ONLY
2237
if (!s->keyframe) {
2238

    
2239
    memcpy(s->current_frame.data[0], s->golden_frame.data[0],
2240
        s->current_frame.linesize[0] * s->height);
2241
    memcpy(s->current_frame.data[1], s->golden_frame.data[1],
2242
        s->current_frame.linesize[1] * s->height / 2);
2243
    memcpy(s->current_frame.data[2], s->golden_frame.data[2],
2244
        s->current_frame.linesize[2] * s->height / 2);
2245

    
2246
} else {
2247
#endif
2248

    
2249
    {START_TIMER
2250
    if (unpack_superblocks(s, &gb)){
2251
        av_log(s->avctx, AV_LOG_ERROR, "error in unpack_superblocks\n");
2252
        return -1;
2253
    }
2254
    STOP_TIMER("unpack_superblocks")}
2255
    {START_TIMER
2256
    if (unpack_modes(s, &gb)){
2257
        av_log(s->avctx, AV_LOG_ERROR, "error in unpack_modes\n");
2258
        return -1;
2259
    }
2260
    STOP_TIMER("unpack_modes")}
2261
    {START_TIMER
2262
    if (unpack_vectors(s, &gb)){
2263
        av_log(s->avctx, AV_LOG_ERROR, "error in unpack_vectors\n");
2264
        return -1;
2265
    }
2266
    STOP_TIMER("unpack_vectors")}
2267
    {START_TIMER
2268
    if (unpack_dct_coeffs(s, &gb)){
2269
        av_log(s->avctx, AV_LOG_ERROR, "error in unpack_dct_coeffs\n");
2270
        return -1;
2271
    }
2272
    STOP_TIMER("unpack_dct_coeffs")}
2273
    {START_TIMER
2274

    
2275
    reverse_dc_prediction(s, 0, s->fragment_width, s->fragment_height);
2276
    if ((avctx->flags & CODEC_FLAG_GRAY) == 0) {
2277
        reverse_dc_prediction(s, s->fragment_start[1],
2278
            s->fragment_width / 2, s->fragment_height / 2);
2279
        reverse_dc_prediction(s, s->fragment_start[2],
2280
            s->fragment_width / 2, s->fragment_height / 2);
2281
    }
2282
    STOP_TIMER("reverse_dc_prediction")}
2283
    {START_TIMER
2284

    
2285
    for (i = 0; i < s->macroblock_height; i++)
2286
        render_slice(s, i);
2287
    STOP_TIMER("render_fragments")}
2288

    
2289
    {START_TIMER
2290
    apply_loop_filter(s);
2291
    STOP_TIMER("apply_loop_filter")}
2292
#if KEYFRAMES_ONLY
2293
}
2294
#endif
2295

    
2296
    *data_size=sizeof(AVFrame);
2297
    *(AVFrame*)data= s->current_frame;
2298

    
2299
    /* release the last frame, if it is allocated and if it is not the
2300
     * golden frame */
2301
    if ((s->last_frame.data[0]) &&
2302
        (s->last_frame.data[0] != s->golden_frame.data[0]))
2303
        avctx->release_buffer(avctx, &s->last_frame);
2304

    
2305
    /* shuffle frames (last = current) */
2306
    s->last_frame= s->current_frame;
2307
    s->current_frame.data[0]= NULL; /* ensure that we catch any access to this released frame */
2308

    
2309
    return buf_size;
2310
}
2311

    
2312
/*
2313
 * This is the ffmpeg/libavcodec API module cleanup function.
2314
 */
2315
static av_cold int vp3_decode_end(AVCodecContext *avctx)
2316
{
2317
    Vp3DecodeContext *s = avctx->priv_data;
2318
    int i;
2319

    
2320
    av_free(s->superblock_coding);
2321
    av_free(s->all_fragments);
2322
    av_free(s->coeff_counts);
2323
    av_free(s->coeffs);
2324
    av_free(s->coded_fragment_list);
2325
    av_free(s->superblock_fragments);
2326
    av_free(s->superblock_macroblocks);
2327
    av_free(s->macroblock_fragments);
2328
    av_free(s->macroblock_coding);
2329

    
2330
    for (i = 0; i < 16; i++) {
2331
        free_vlc(&s->dc_vlc[i]);
2332
        free_vlc(&s->ac_vlc_1[i]);
2333
        free_vlc(&s->ac_vlc_2[i]);
2334
        free_vlc(&s->ac_vlc_3[i]);
2335
        free_vlc(&s->ac_vlc_4[i]);
2336
    }
2337

    
2338
    free_vlc(&s->superblock_run_length_vlc);
2339
    free_vlc(&s->fragment_run_length_vlc);
2340
    free_vlc(&s->mode_code_vlc);
2341
    free_vlc(&s->motion_vector_vlc);
2342

    
2343
    /* release all frames */
2344
    if (s->golden_frame.data[0] && s->golden_frame.data[0] != s->last_frame.data[0])
2345
        avctx->release_buffer(avctx, &s->golden_frame);
2346
    if (s->last_frame.data[0])
2347
        avctx->release_buffer(avctx, &s->last_frame);
2348
    /* no need to release the current_frame since it will always be pointing
2349
     * to the same frame as either the golden or last frame */
2350

    
2351
    return 0;
2352
}
2353

    
2354
static int read_huffman_tree(AVCodecContext *avctx, GetBitContext *gb)
2355
{
2356
    Vp3DecodeContext *s = avctx->priv_data;
2357

    
2358
    if (get_bits1(gb)) {
2359
        int token;
2360
        if (s->entries >= 32) { /* overflow */
2361
            av_log(avctx, AV_LOG_ERROR, "huffman tree overflow\n");
2362
            return -1;
2363
        }
2364
        token = get_bits(gb, 5);
2365
        //av_log(avctx, AV_LOG_DEBUG, "hti %d hbits %x token %d entry : %d size %d\n", s->hti, s->hbits, token, s->entries, s->huff_code_size);
2366
        s->huffman_table[s->hti][token][0] = s->hbits;
2367
        s->huffman_table[s->hti][token][1] = s->huff_code_size;
2368
        s->entries++;
2369
    }
2370
    else {
2371
        if (s->huff_code_size >= 32) {/* overflow */
2372
            av_log(avctx, AV_LOG_ERROR, "huffman tree overflow\n");
2373
            return -1;
2374
        }
2375
        s->huff_code_size++;
2376
        s->hbits <<= 1;
2377
        read_huffman_tree(avctx, gb);
2378
        s->hbits |= 1;
2379
        read_huffman_tree(avctx, gb);
2380
        s->hbits >>= 1;
2381
        s->huff_code_size--;
2382
    }
2383
    return 0;
2384
}
2385

    
2386
#ifdef CONFIG_THEORA_DECODER
2387
static int theora_decode_header(AVCodecContext *avctx, GetBitContext *gb)
2388
{
2389
    Vp3DecodeContext *s = avctx->priv_data;
2390
    int visible_width, visible_height;
2391

    
2392
    s->theora = get_bits_long(gb, 24);
2393
    av_log(avctx, AV_LOG_DEBUG, "Theora bitstream version %X\n", s->theora);
2394

    
2395
    /* 3.2.0 aka alpha3 has the same frame orientation as original vp3 */
2396
    /* but previous versions have the image flipped relative to vp3 */
2397
    if (s->theora < 0x030200)
2398
    {
2399
        s->flipped_image = 1;
2400
        av_log(avctx, AV_LOG_DEBUG, "Old (<alpha3) Theora bitstream, flipped image\n");
2401
    }
2402

    
2403
    s->width = get_bits(gb, 16) << 4;
2404
    s->height = get_bits(gb, 16) << 4;
2405

    
2406
    if(avcodec_check_dimensions(avctx, s->width, s->height)){
2407
        av_log(avctx, AV_LOG_ERROR, "Invalid dimensions (%dx%d)\n", s->width, s->height);
2408
        s->width= s->height= 0;
2409
        return -1;
2410
    }
2411

    
2412
    if (s->theora >= 0x030400)
2413
    {
2414
        skip_bits(gb, 32); /* total number of superblocks in a frame */
2415
        // fixme, the next field is 36bits long
2416
        skip_bits(gb, 32); /* total number of blocks in a frame */
2417
        skip_bits(gb, 4); /* total number of blocks in a frame */
2418
        skip_bits(gb, 32); /* total number of macroblocks in a frame */
2419
    }
2420

    
2421
    visible_width  = get_bits_long(gb, 24);
2422
    visible_height = get_bits_long(gb, 24);
2423

    
2424
    if (s->theora >= 0x030200) {
2425
        skip_bits(gb, 8); /* offset x */
2426
        skip_bits(gb, 8); /* offset y */
2427
    }
2428

    
2429
    skip_bits(gb, 32); /* fps numerator */
2430
    skip_bits(gb, 32); /* fps denumerator */
2431
    skip_bits(gb, 24); /* aspect numerator */
2432
    skip_bits(gb, 24); /* aspect denumerator */
2433

    
2434
    if (s->theora < 0x030200)
2435
        skip_bits(gb, 5); /* keyframe frequency force */
2436
    skip_bits(gb, 8); /* colorspace */
2437
    if (s->theora >= 0x030400)
2438
        skip_bits(gb, 2); /* pixel format: 420,res,422,444 */
2439
    skip_bits(gb, 24); /* bitrate */
2440

    
2441
    skip_bits(gb, 6); /* quality hint */
2442

    
2443
    if (s->theora >= 0x030200)
2444
    {
2445
        skip_bits(gb, 5); /* keyframe frequency force */
2446

    
2447
        if (s->theora < 0x030400)
2448
            skip_bits(gb, 5); /* spare bits */
2449
    }
2450

    
2451
//    align_get_bits(gb);
2452

    
2453
    if (   visible_width  <= s->width  && visible_width  > s->width-16
2454
        && visible_height <= s->height && visible_height > s->height-16)
2455
        avcodec_set_dimensions(avctx, visible_width, visible_height);
2456
    else
2457
        avcodec_set_dimensions(avctx, s->width, s->height);
2458

    
2459
    return 0;
2460
}
2461

    
2462
static int theora_decode_tables(AVCodecContext *avctx, GetBitContext *gb)
2463
{
2464
    Vp3DecodeContext *s = avctx->priv_data;
2465
    int i, n, matrices, inter, plane;
2466

    
2467
    if (s->theora >= 0x030200) {
2468
        n = get_bits(gb, 3);
2469
        /* loop filter limit values table */
2470
        for (i = 0; i < 64; i++)
2471
            s->filter_limit_values[i] = get_bits(gb, n);
2472
    }
2473

    
2474
    if (s->theora >= 0x030200)
2475
        n = get_bits(gb, 4) + 1;
2476
    else
2477
        n = 16;
2478
    /* quality threshold table */
2479
    for (i = 0; i < 64; i++)
2480
        s->coded_ac_scale_factor[i] = get_bits(gb, n);
2481

    
2482
    if (s->theora >= 0x030200)
2483
        n = get_bits(gb, 4) + 1;
2484
    else
2485
        n = 16;
2486
    /* dc scale factor table */
2487
    for (i = 0; i < 64; i++)
2488
        s->coded_dc_scale_factor[i] = get_bits(gb, n);
2489

    
2490
    if (s->theora >= 0x030200)
2491
        matrices = get_bits(gb, 9) + 1;
2492
    else
2493
        matrices = 3;
2494

    
2495
    if(matrices > 384){
2496
        av_log(avctx, AV_LOG_ERROR, "invalid number of base matrixes\n");
2497
        return -1;
2498
    }
2499

    
2500
    for(n=0; n<matrices; n++){
2501
        for (i = 0; i < 64; i++)
2502
            s->base_matrix[n][i]= get_bits(gb, 8);
2503
    }
2504

    
2505
    for (inter = 0; inter <= 1; inter++) {
2506
        for (plane = 0; plane <= 2; plane++) {
2507
            int newqr= 1;
2508
            if (inter || plane > 0)
2509
                newqr = get_bits1(gb);
2510
            if (!newqr) {
2511
                int qtj, plj;
2512
                if(inter && get_bits1(gb)){
2513
                    qtj = 0;
2514
                    plj = plane;
2515
                }else{
2516
                    qtj= (3*inter + plane - 1) / 3;
2517
                    plj= (plane + 2) % 3;
2518
                }
2519
                s->qr_count[inter][plane]= s->qr_count[qtj][plj];
2520
                memcpy(s->qr_size[inter][plane], s->qr_size[qtj][plj], sizeof(s->qr_size[0][0]));
2521
                memcpy(s->qr_base[inter][plane], s->qr_base[qtj][plj], sizeof(s->qr_base[0][0]));
2522
            } else {
2523
                int qri= 0;
2524
                int qi = 0;
2525

    
2526
                for(;;){
2527
                    i= get_bits(gb, av_log2(matrices-1)+1);
2528
                    if(i>= matrices){
2529
                        av_log(avctx, AV_LOG_ERROR, "invalid base matrix index\n");
2530
                        return -1;
2531
                    }
2532
                    s->qr_base[inter][plane][qri]= i;
2533
                    if(qi >= 63)
2534
                        break;
2535
                    i = get_bits(gb, av_log2(63-qi)+1) + 1;
2536
                    s->qr_size[inter][plane][qri++]= i;
2537
                    qi += i;
2538
                }
2539

    
2540
                if (qi > 63) {
2541
                    av_log(avctx, AV_LOG_ERROR, "invalid qi %d > 63\n", qi);
2542
                    return -1;
2543
                }
2544
                s->qr_count[inter][plane]= qri;
2545
            }
2546
        }
2547
    }
2548

    
2549
    /* Huffman tables */
2550
    for (s->hti = 0; s->hti < 80; s->hti++) {
2551
        s->entries = 0;
2552
        s->huff_code_size = 1;
2553
        if (!get_bits1(gb)) {
2554
            s->hbits = 0;
2555
            read_huffman_tree(avctx, gb);
2556
            s->hbits = 1;
2557
            read_huffman_tree(avctx, gb);
2558
        }
2559
    }
2560

    
2561
    s->theora_tables = 1;
2562

    
2563
    return 0;
2564
}
2565

    
2566
static int theora_decode_init(AVCodecContext *avctx)
2567
{
2568
    Vp3DecodeContext *s = avctx->priv_data;
2569
    GetBitContext gb;
2570
    int ptype;
2571
    uint8_t *header_start[3];
2572
    int header_len[3];
2573
    int i;
2574

    
2575
    s->theora = 1;
2576

    
2577
    if (!avctx->extradata_size)
2578
    {
2579
        av_log(avctx, AV_LOG_ERROR, "Missing extradata!\n");
2580
        return -1;
2581
    }
2582

    
2583
    if (ff_split_xiph_headers(avctx->extradata, avctx->extradata_size,
2584
                              42, header_start, header_len) < 0) {
2585
        av_log(avctx, AV_LOG_ERROR, "Corrupt extradata\n");
2586
        return -1;
2587
    }
2588

    
2589
  for(i=0;i<3;i++) {
2590
    init_get_bits(&gb, header_start[i], header_len[i]);
2591

    
2592
    ptype = get_bits(&gb, 8);
2593
    debug_vp3("Theora headerpacket type: %x\n", ptype);
2594

    
2595
     if (!(ptype & 0x80))
2596
     {
2597
        av_log(avctx, AV_LOG_ERROR, "Invalid extradata!\n");
2598
//        return -1;
2599
     }
2600

    
2601
    // FIXME: Check for this as well.
2602
    skip_bits(&gb, 6*8); /* "theora" */
2603

    
2604
    switch(ptype)
2605
    {
2606
        case 0x80:
2607
            theora_decode_header(avctx, &gb);
2608
                break;
2609
        case 0x81:
2610
// FIXME: is this needed? it breaks sometimes
2611
//            theora_decode_comments(avctx, gb);
2612
            break;
2613
        case 0x82:
2614
            theora_decode_tables(avctx, &gb);
2615
            break;
2616
        default:
2617
            av_log(avctx, AV_LOG_ERROR, "Unknown Theora config packet: %d\n", ptype&~0x80);
2618
            break;
2619
    }
2620
    if(8*header_len[i] != get_bits_count(&gb))
2621
        av_log(avctx, AV_LOG_ERROR, "%d bits left in packet %X\n", 8*header_len[i] - get_bits_count(&gb), ptype);
2622
    if (s->theora < 0x030200)
2623
        break;
2624
  }
2625

    
2626
    vp3_decode_init(avctx);
2627
    return 0;
2628
}
2629

    
2630
AVCodec theora_decoder = {
2631
    "theora",
2632
    CODEC_TYPE_VIDEO,
2633
    CODEC_ID_THEORA,
2634
    sizeof(Vp3DecodeContext),
2635
    theora_decode_init,
2636
    NULL,
2637
    vp3_decode_end,
2638
    vp3_decode_frame,
2639
    0,
2640
    NULL,
2641
    .long_name = "Theora",
2642
};
2643
#endif
2644

    
2645
AVCodec vp3_decoder = {
2646
    "vp3",
2647
    CODEC_TYPE_VIDEO,
2648
    CODEC_ID_VP3,
2649
    sizeof(Vp3DecodeContext),
2650
    vp3_decode_init,
2651
    NULL,
2652
    vp3_decode_end,
2653
    vp3_decode_frame,
2654
    0,
2655
    NULL,
2656
    .long_name = "On2 VP3",
2657
};