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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 libavcodec/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 "avcodec.h"
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#include "dsputil.h"
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#include "get_bits.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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static av_cold int vp3_decode_end(AVCodecContext *avctx);
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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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    uint8_t qpi;
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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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#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
80

    
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/* special internal mode */
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#define MODE_COPY             8
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/* There are 6 preset schemes, plus a free-form scheme */
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static const int ModeAlphabet[6][CODING_MODE_COUNT] =
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{
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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
126

    
127
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;
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    int flipped_image;
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    int qps[3];
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    int nqps;
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    int last_qps[3];
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    int superblock_count;
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    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;
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    int macroblock_width;
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    int macroblock_height;
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    int fragment_count;
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    int fragment_width;
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    int fragment_height;
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    Vp3Fragment *all_fragments;
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    uint8_t *coeff_counts;
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    Coeff *coeffs;
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    Coeff *next_coeff;
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    int fragment_start[3];
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    ScanTable scantable;
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    /* tables */
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    uint16_t coded_dc_scale_factor[64];
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    uint32_t coded_ac_scale_factor[64];
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    uint8_t base_matrix[384][64];
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    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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    /* this is a list of indexes into the all_fragments array indicating
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     * which of the fragments are coded */
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    int *coded_fragment_list;
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    int coded_fragment_list_index;
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    int pixel_addresses_initialized;
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    /* track which fragments have already been decoded; called 'fast'
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     * because this data structure avoids having to iterate through every
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     * fragment in coded_fragment_list; once a fragment has been fully
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     * decoded, it is removed from this list */
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    int *fast_fragment_list;
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    int fragment_list_y_head;
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    int fragment_list_c_head;
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    VLC dc_vlc[16];
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    VLC ac_vlc_1[16];
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    VLC ac_vlc_2[16];
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    VLC ac_vlc_3[16];
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    VLC ac_vlc_4[16];
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    VLC superblock_run_length_vlc;
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    VLC fragment_run_length_vlc;
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    VLC mode_code_vlc;
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    VLC motion_vector_vlc;
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    /* these arrays need to be on 16-byte boundaries since SSE2 operations
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     * index into them */
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    DECLARE_ALIGNED_16(int16_t, qmat[3][2][3][64]);     //<qmat[qpi][is_inter][plane]
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    /* This table contains superblock_count * 16 entries. Each set of 16
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     * numbers corresponds to the fragment indexes 0..15 of the superblock.
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     * An entry will be -1 to indicate that no entry corresponds to that
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     * index. */
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    int *superblock_fragments;
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    /* This table contains superblock_count * 4 entries. Each set of 4
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     * numbers corresponds to the macroblock indexes 0..3 of the superblock.
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     * An entry will be -1 to indicate that no entry corresponds to that
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     * index. */
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    int *superblock_macroblocks;
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    /* This table contains macroblock_count * 6 entries. Each set of 6
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     * numbers corresponds to the fragment indexes 0..5 which comprise
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     * the macroblock (4 Y fragments and 2 C fragments). */
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    int *macroblock_fragments;
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    /* This is an array that indicates how a particular macroblock
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     * is coded. */
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    unsigned char *macroblock_coding;
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    int first_coded_y_fragment;
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    int first_coded_c_fragment;
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    int last_coded_y_fragment;
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    int last_coded_c_fragment;
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    uint8_t edge_emu_buffer[9*2048]; //FIXME dynamic alloc
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    int8_t qscale_table[2048]; //FIXME dynamic alloc (width+15)/16
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    /* Huffman decode */
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    int hti;
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    unsigned int hbits;
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    int entries;
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    int huff_code_size;
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    uint16_t huffman_table[80][32][2];
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    uint8_t filter_limit_values[64];
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    DECLARE_ALIGNED_8(int, bounding_values_array[256+2]);
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} Vp3DecodeContext;
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/************************************************************************
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 * VP3 specific functions
246
 ************************************************************************/
247

    
248
/*
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 * This function sets up all of the various blocks mappings:
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 * superblocks <-> fragments, macroblocks <-> fragments,
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 * superblocks <-> macroblocks
252
 *
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 * Returns 0 is successful; returns 1 if *anything* went wrong.
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 */
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static int init_block_mapping(Vp3DecodeContext *s)
256
{
257
    int i, j;
258
    signed int hilbert_walk_mb[4];
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    int current_fragment = 0;
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    int current_width = 0;
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    int current_height = 0;
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    int right_edge = 0;
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    int bottom_edge = 0;
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    int superblock_row_inc = 0;
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    int mapping_index = 0;
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268
    int current_macroblock;
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    int c_fragment;
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    static const signed char travel_width[16] = {
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         1,  1,  0, -1,
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         0,  0,  1,  0,
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         1,  0,  1,  0,
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         0, -1,  0,  1
276
    };
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    static const signed char travel_height[16] = {
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         0,  0,  1,  0,
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         1,  1,  0, -1,
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         0,  1,  0, -1,
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        -1,  0, -1,  0
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    };
284

    
285
    static const signed char travel_width_mb[4] = {
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         1,  0,  1,  0
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    };
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289
    static const signed char travel_height_mb[4] = {
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         0,  1,  0, -1
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    };
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293
    hilbert_walk_mb[0] = 1;
294
    hilbert_walk_mb[1] = s->macroblock_width;
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    hilbert_walk_mb[2] = 1;
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    hilbert_walk_mb[3] = -s->macroblock_width;
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    /* iterate through each superblock (all planes) and map the fragments */
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    for (i = 0; i < s->superblock_count; i++) {
300
        /* time to re-assign the limits? */
301
        if (i == 0) {
302

    
303
            /* start of Y superblocks */
304
            right_edge = s->fragment_width;
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            bottom_edge = s->fragment_height;
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            current_width = -1;
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            current_height = 0;
308
            superblock_row_inc = 3 * s->fragment_width -
309
                (s->y_superblock_width * 4 - s->fragment_width);
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311
            /* the first operation for this variable is to advance by 1 */
312
            current_fragment = -1;
313

    
314
        } else if (i == s->u_superblock_start) {
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316
            /* start of U superblocks */
317
            right_edge = s->fragment_width / 2;
318
            bottom_edge = s->fragment_height / 2;
319
            current_width = -1;
320
            current_height = 0;
321
            superblock_row_inc = 3 * (s->fragment_width / 2) -
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                (s->c_superblock_width * 4 - s->fragment_width / 2);
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            /* the first operation for this variable is to advance by 1 */
325
            current_fragment = s->fragment_start[1] - 1;
326

    
327
        } else if (i == s->v_superblock_start) {
328

    
329
            /* start of V superblocks */
330
            right_edge = s->fragment_width / 2;
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            bottom_edge = s->fragment_height / 2;
332
            current_width = -1;
333
            current_height = 0;
334
            superblock_row_inc = 3 * (s->fragment_width / 2) -
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                (s->c_superblock_width * 4 - s->fragment_width / 2);
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337
            /* the first operation for this variable is to advance by 1 */
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            current_fragment = s->fragment_start[2] - 1;
339

    
340
        }
341

    
342
        if (current_width >= right_edge - 1) {
343
            /* reset width and move to next superblock row */
344
            current_width = -1;
345
            current_height += 4;
346

    
347
            /* fragment is now at the start of a new superblock row */
348
            current_fragment += superblock_row_inc;
349
        }
350

    
351
        /* iterate through all 16 fragments in a superblock */
352
        for (j = 0; j < 16; j++) {
353
            current_fragment += travel_width[j] + right_edge * travel_height[j];
354
            current_width += travel_width[j];
355
            current_height += travel_height[j];
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357
            /* check if the fragment is in bounds */
358
            if ((current_width < right_edge) &&
359
                (current_height < bottom_edge)) {
360
                s->superblock_fragments[mapping_index] = current_fragment;
361
            } else {
362
                s->superblock_fragments[mapping_index] = -1;
363
            }
364

    
365
            mapping_index++;
366
        }
367
    }
368

    
369
    /* initialize the superblock <-> macroblock mapping; iterate through
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     * all of the Y plane superblocks to build this mapping */
371
    right_edge = s->macroblock_width;
372
    bottom_edge = s->macroblock_height;
373
    current_width = -1;
374
    current_height = 0;
375
    superblock_row_inc = s->macroblock_width -
376
        (s->y_superblock_width * 2 - s->macroblock_width);
377
    mapping_index = 0;
378
    current_macroblock = -1;
379
    for (i = 0; i < s->u_superblock_start; i++) {
380

    
381
        if (current_width >= right_edge - 1) {
382
            /* reset width and move to next superblock row */
383
            current_width = -1;
384
            current_height += 2;
385

    
386
            /* macroblock is now at the start of a new superblock row */
387
            current_macroblock += superblock_row_inc;
388
        }
389

    
390
        /* iterate through each potential macroblock in the superblock */
391
        for (j = 0; j < 4; j++) {
392
            current_macroblock += hilbert_walk_mb[j];
393
            current_width += travel_width_mb[j];
394
            current_height += travel_height_mb[j];
395

    
396
            /* check if the macroblock is in bounds */
397
            if ((current_width < right_edge) &&
398
                (current_height < bottom_edge)) {
399
                s->superblock_macroblocks[mapping_index] = current_macroblock;
400
            } else {
401
                s->superblock_macroblocks[mapping_index] = -1;
402
            }
403

    
404
            mapping_index++;
405
        }
406
    }
407

    
408
    /* initialize the macroblock <-> fragment mapping */
409
    current_fragment = 0;
410
    current_macroblock = 0;
411
    mapping_index = 0;
412
    for (i = 0; i < s->fragment_height; i += 2) {
413

    
414
        for (j = 0; j < s->fragment_width; j += 2) {
415

    
416
            s->all_fragments[current_fragment].macroblock = current_macroblock;
417
            s->macroblock_fragments[mapping_index++] = current_fragment;
418

    
419
            if (j + 1 < s->fragment_width) {
420
                s->all_fragments[current_fragment + 1].macroblock = current_macroblock;
421
                s->macroblock_fragments[mapping_index++] = current_fragment + 1;
422
            } else
423
                s->macroblock_fragments[mapping_index++] = -1;
424

    
425
            if (i + 1 < s->fragment_height) {
426
                s->all_fragments[current_fragment + s->fragment_width].macroblock =
427
                    current_macroblock;
428
                s->macroblock_fragments[mapping_index++] =
429
                    current_fragment + s->fragment_width;
430
            } else
431
                s->macroblock_fragments[mapping_index++] = -1;
432

    
433
            if ((j + 1 < s->fragment_width) && (i + 1 < s->fragment_height)) {
434
                s->all_fragments[current_fragment + s->fragment_width + 1].macroblock =
435
                    current_macroblock;
436
                s->macroblock_fragments[mapping_index++] =
437
                    current_fragment + s->fragment_width + 1;
438
            } else
439
                s->macroblock_fragments[mapping_index++] = -1;
440

    
441
            /* C planes */
442
            c_fragment = s->fragment_start[1] +
443
                (i * s->fragment_width / 4) + (j / 2);
444
            s->all_fragments[c_fragment].macroblock = s->macroblock_count;
445
            s->macroblock_fragments[mapping_index++] = c_fragment;
446

    
447
            c_fragment = s->fragment_start[2] +
448
                (i * s->fragment_width / 4) + (j / 2);
449
            s->all_fragments[c_fragment].macroblock = s->macroblock_count;
450
            s->macroblock_fragments[mapping_index++] = c_fragment;
451

    
452
            if (j + 2 <= s->fragment_width)
453
                current_fragment += 2;
454
            else
455
                current_fragment++;
456
            current_macroblock++;
457
        }
458

    
459
        current_fragment += s->fragment_width;
460
    }
461

    
462
    return 0;  /* successful path out */
463
}
464

    
465
/*
466
 * This function wipes out all of the fragment data.
467
 */
468
static void init_frame(Vp3DecodeContext *s, GetBitContext *gb)
469
{
470
    int i;
471

    
472
    /* zero out all of the fragment information */
473
    s->coded_fragment_list_index = 0;
474
    for (i = 0; i < s->fragment_count; i++) {
475
        s->coeff_counts[i] = 0;
476
        s->all_fragments[i].motion_x = 127;
477
        s->all_fragments[i].motion_y = 127;
478
        s->all_fragments[i].next_coeff= NULL;
479
        s->all_fragments[i].qpi = 0;
480
        s->coeffs[i].index=
481
        s->coeffs[i].coeff=0;
482
        s->coeffs[i].next= NULL;
483
    }
484
}
485

    
486
/*
487
 * This function sets up the dequantization tables used for a particular
488
 * frame.
489
 */
490
static void init_dequantizer(Vp3DecodeContext *s, int qpi)
491
{
492
    int ac_scale_factor = s->coded_ac_scale_factor[s->qps[qpi]];
493
    int dc_scale_factor = s->coded_dc_scale_factor[s->qps[qpi]];
494
    int i, plane, inter, qri, bmi, bmj, qistart;
495

    
496
    for(inter=0; inter<2; inter++){
497
        for(plane=0; plane<3; plane++){
498
            int sum=0;
499
            for(qri=0; qri<s->qr_count[inter][plane]; qri++){
500
                sum+= s->qr_size[inter][plane][qri];
501
                if(s->qps[qpi] <= sum)
502
                    break;
503
            }
504
            qistart= sum - s->qr_size[inter][plane][qri];
505
            bmi= s->qr_base[inter][plane][qri  ];
506
            bmj= s->qr_base[inter][plane][qri+1];
507
            for(i=0; i<64; i++){
508
                int coeff= (  2*(sum    -s->qps[qpi])*s->base_matrix[bmi][i]
509
                            - 2*(qistart-s->qps[qpi])*s->base_matrix[bmj][i]
510
                            + s->qr_size[inter][plane][qri])
511
                           / (2*s->qr_size[inter][plane][qri]);
512

    
513
                int qmin= 8<<(inter + !i);
514
                int qscale= i ? ac_scale_factor : dc_scale_factor;
515

    
516
                s->qmat[qpi][inter][plane][s->dsp.idct_permutation[i]]= av_clip((qscale * coeff)/100 * 4, qmin, 4096);
517
            }
518
            // all DC coefficients use the same quant so as not to interfere with DC prediction
519
            s->qmat[qpi][inter][plane][0] = s->qmat[0][inter][plane][0];
520
        }
521
    }
522

    
523
    memset(s->qscale_table, (FFMAX(s->qmat[0][0][0][1], s->qmat[0][0][1][1])+8)/16, 512); //FIXME finetune
524
}
525

    
526
/*
527
 * This function initializes the loop filter boundary limits if the frame's
528
 * quality index is different from the previous frame's.
529
 *
530
 * The filter_limit_values may not be larger than 127.
531
 */
532
static void init_loop_filter(Vp3DecodeContext *s)
533
{
534
    int *bounding_values= s->bounding_values_array+127;
535
    int filter_limit;
536
    int x;
537
    int value;
538

    
539
    filter_limit = s->filter_limit_values[s->qps[0]];
540

    
541
    /* set up the bounding values */
542
    memset(s->bounding_values_array, 0, 256 * sizeof(int));
543
    for (x = 0; x < filter_limit; x++) {
544
        bounding_values[-x] = -x;
545
        bounding_values[x] = x;
546
    }
547
    for (x = value = filter_limit; x < 128 && value; x++, value--) {
548
        bounding_values[ x] =  value;
549
        bounding_values[-x] = -value;
550
    }
551
    if (value)
552
        bounding_values[128] = value;
553
    bounding_values[129] = bounding_values[130] = filter_limit * 0x02020202;
554
}
555

    
556
/*
557
 * This function unpacks all of the superblock/macroblock/fragment coding
558
 * information from the bitstream.
559
 */
560
static int unpack_superblocks(Vp3DecodeContext *s, GetBitContext *gb)
561
{
562
    int bit = 0;
563
    int current_superblock = 0;
564
    int current_run = 0;
565
    int decode_fully_flags = 0;
566
    int decode_partial_blocks = 0;
567
    int first_c_fragment_seen;
568

    
569
    int i, j;
570
    int current_fragment;
571

    
572
    if (s->keyframe) {
573
        memset(s->superblock_coding, SB_FULLY_CODED, s->superblock_count);
574

    
575
    } else {
576

    
577
        /* unpack the list of partially-coded superblocks */
578
        bit = get_bits1(gb);
579
        /* toggle the bit because as soon as the first run length is
580
         * fetched the bit will be toggled again */
581
        bit ^= 1;
582
        while (current_superblock < s->superblock_count) {
583
            if (current_run-- == 0) {
584
                bit ^= 1;
585
                current_run = get_vlc2(gb,
586
                    s->superblock_run_length_vlc.table, 6, 2);
587
                if (current_run == 33)
588
                    current_run += get_bits(gb, 12);
589

    
590
                /* if any of the superblocks are not partially coded, flag
591
                 * a boolean to decode the list of fully-coded superblocks */
592
                if (bit == 0) {
593
                    decode_fully_flags = 1;
594
                } else {
595

    
596
                    /* make a note of the fact that there are partially coded
597
                     * superblocks */
598
                    decode_partial_blocks = 1;
599
                }
600
            }
601
            s->superblock_coding[current_superblock++] = bit;
602
        }
603

    
604
        /* unpack the list of fully coded superblocks if any of the blocks were
605
         * not marked as partially coded in the previous step */
606
        if (decode_fully_flags) {
607

    
608
            current_superblock = 0;
609
            current_run = 0;
610
            bit = get_bits1(gb);
611
            /* toggle the bit because as soon as the first run length is
612
             * fetched the bit will be toggled again */
613
            bit ^= 1;
614
            while (current_superblock < s->superblock_count) {
615

    
616
                /* skip any superblocks already marked as partially coded */
617
                if (s->superblock_coding[current_superblock] == SB_NOT_CODED) {
618

    
619
                    if (current_run-- == 0) {
620
                        bit ^= 1;
621
                        current_run = get_vlc2(gb,
622
                            s->superblock_run_length_vlc.table, 6, 2);
623
                        if (current_run == 33)
624
                            current_run += get_bits(gb, 12);
625
                    }
626
                    s->superblock_coding[current_superblock] = 2*bit;
627
                }
628
                current_superblock++;
629
            }
630
        }
631

    
632
        /* if there were partial blocks, initialize bitstream for
633
         * unpacking fragment codings */
634
        if (decode_partial_blocks) {
635

    
636
            current_run = 0;
637
            bit = get_bits1(gb);
638
            /* toggle the bit because as soon as the first run length is
639
             * fetched the bit will be toggled again */
640
            bit ^= 1;
641
        }
642
    }
643

    
644
    /* figure out which fragments are coded; iterate through each
645
     * superblock (all planes) */
646
    s->coded_fragment_list_index = 0;
647
    s->next_coeff= s->coeffs + s->fragment_count;
648
    s->first_coded_y_fragment = s->first_coded_c_fragment = 0;
649
    s->last_coded_y_fragment = s->last_coded_c_fragment = -1;
650
    first_c_fragment_seen = 0;
651
    memset(s->macroblock_coding, MODE_COPY, s->macroblock_count);
652
    for (i = 0; i < s->superblock_count; i++) {
653

    
654
        /* iterate through all 16 fragments in a superblock */
655
        for (j = 0; j < 16; j++) {
656

    
657
            /* if the fragment is in bounds, check its coding status */
658
            current_fragment = s->superblock_fragments[i * 16 + j];
659
            if (current_fragment >= s->fragment_count) {
660
                av_log(s->avctx, AV_LOG_ERROR, "  vp3:unpack_superblocks(): bad fragment number (%d >= %d)\n",
661
                    current_fragment, s->fragment_count);
662
                return 1;
663
            }
664
            if (current_fragment != -1) {
665
                if (s->superblock_coding[i] == SB_NOT_CODED) {
666

    
667
                    /* copy all the fragments from the prior frame */
668
                    s->all_fragments[current_fragment].coding_method =
669
                        MODE_COPY;
670

    
671
                } else if (s->superblock_coding[i] == SB_PARTIALLY_CODED) {
672

    
673
                    /* fragment may or may not be coded; this is the case
674
                     * that cares about the fragment coding runs */
675
                    if (current_run-- == 0) {
676
                        bit ^= 1;
677
                        current_run = get_vlc2(gb,
678
                            s->fragment_run_length_vlc.table, 5, 2);
679
                    }
680

    
681
                    if (bit) {
682
                        /* default mode; actual mode will be decoded in
683
                         * the next phase */
684
                        s->all_fragments[current_fragment].coding_method =
685
                            MODE_INTER_NO_MV;
686
                        s->all_fragments[current_fragment].next_coeff= s->coeffs + current_fragment;
687
                        s->coded_fragment_list[s->coded_fragment_list_index] =
688
                            current_fragment;
689
                        if ((current_fragment >= s->fragment_start[1]) &&
690
                            (s->last_coded_y_fragment == -1) &&
691
                            (!first_c_fragment_seen)) {
692
                            s->first_coded_c_fragment = s->coded_fragment_list_index;
693
                            s->last_coded_y_fragment = s->first_coded_c_fragment - 1;
694
                            first_c_fragment_seen = 1;
695
                        }
696
                        s->coded_fragment_list_index++;
697
                        s->macroblock_coding[s->all_fragments[current_fragment].macroblock] = MODE_INTER_NO_MV;
698
                    } else {
699
                        /* not coded; copy this fragment from the prior frame */
700
                        s->all_fragments[current_fragment].coding_method =
701
                            MODE_COPY;
702
                    }
703

    
704
                } else {
705

    
706
                    /* fragments are fully coded in this superblock; actual
707
                     * coding will be determined in next step */
708
                    s->all_fragments[current_fragment].coding_method =
709
                        MODE_INTER_NO_MV;
710
                    s->all_fragments[current_fragment].next_coeff= s->coeffs + current_fragment;
711
                    s->coded_fragment_list[s->coded_fragment_list_index] =
712
                        current_fragment;
713
                    if ((current_fragment >= s->fragment_start[1]) &&
714
                        (s->last_coded_y_fragment == -1) &&
715
                        (!first_c_fragment_seen)) {
716
                        s->first_coded_c_fragment = s->coded_fragment_list_index;
717
                        s->last_coded_y_fragment = s->first_coded_c_fragment - 1;
718
                        first_c_fragment_seen = 1;
719
                    }
720
                    s->coded_fragment_list_index++;
721
                    s->macroblock_coding[s->all_fragments[current_fragment].macroblock] = MODE_INTER_NO_MV;
722
                }
723
            }
724
        }
725
    }
726

    
727
    if (!first_c_fragment_seen)
728
        /* only Y fragments coded in this frame */
729
        s->last_coded_y_fragment = s->coded_fragment_list_index - 1;
730
    else
731
        /* end the list of coded C fragments */
732
        s->last_coded_c_fragment = s->coded_fragment_list_index - 1;
733

    
734
    for (i = 0; i < s->fragment_count - 1; i++) {
735
        s->fast_fragment_list[i] = i + 1;
736
    }
737
    s->fast_fragment_list[s->fragment_count - 1] = -1;
738

    
739
    if (s->last_coded_y_fragment == -1)
740
        s->fragment_list_y_head = -1;
741
    else {
742
        s->fragment_list_y_head = s->first_coded_y_fragment;
743
        s->fast_fragment_list[s->last_coded_y_fragment] = -1;
744
    }
745

    
746
    if (s->last_coded_c_fragment == -1)
747
        s->fragment_list_c_head = -1;
748
    else {
749
        s->fragment_list_c_head = s->first_coded_c_fragment;
750
        s->fast_fragment_list[s->last_coded_c_fragment] = -1;
751
    }
752

    
753
    return 0;
754
}
755

    
756
/*
757
 * This function unpacks all the coding mode data for individual macroblocks
758
 * from the bitstream.
759
 */
760
static int unpack_modes(Vp3DecodeContext *s, GetBitContext *gb)
761
{
762
    int i, j, k;
763
    int scheme;
764
    int current_macroblock;
765
    int current_fragment;
766
    int coding_mode;
767
    int custom_mode_alphabet[CODING_MODE_COUNT];
768

    
769
    if (s->keyframe) {
770
        for (i = 0; i < s->fragment_count; i++)
771
            s->all_fragments[i].coding_method = MODE_INTRA;
772

    
773
    } else {
774

    
775
        /* fetch the mode coding scheme for this frame */
776
        scheme = get_bits(gb, 3);
777

    
778
        /* is it a custom coding scheme? */
779
        if (scheme == 0) {
780
            for (i = 0; i < 8; i++)
781
                custom_mode_alphabet[i] = MODE_INTER_NO_MV;
782
            for (i = 0; i < 8; i++)
783
                custom_mode_alphabet[get_bits(gb, 3)] = i;
784
        }
785

    
786
        /* iterate through all of the macroblocks that contain 1 or more
787
         * coded fragments */
788
        for (i = 0; i < s->u_superblock_start; i++) {
789

    
790
            for (j = 0; j < 4; j++) {
791
                current_macroblock = s->superblock_macroblocks[i * 4 + j];
792
                if ((current_macroblock == -1) ||
793
                    (s->macroblock_coding[current_macroblock] == MODE_COPY))
794
                    continue;
795
                if (current_macroblock >= s->macroblock_count) {
796
                    av_log(s->avctx, AV_LOG_ERROR, "  vp3:unpack_modes(): bad macroblock number (%d >= %d)\n",
797
                        current_macroblock, s->macroblock_count);
798
                    return 1;
799
                }
800

    
801
                /* mode 7 means get 3 bits for each coding mode */
802
                if (scheme == 7)
803
                    coding_mode = get_bits(gb, 3);
804
                else if(scheme == 0)
805
                    coding_mode = custom_mode_alphabet
806
                        [get_vlc2(gb, s->mode_code_vlc.table, 3, 3)];
807
                else
808
                    coding_mode = ModeAlphabet[scheme-1]
809
                        [get_vlc2(gb, s->mode_code_vlc.table, 3, 3)];
810

    
811
                s->macroblock_coding[current_macroblock] = coding_mode;
812
                for (k = 0; k < 6; k++) {
813
                    current_fragment =
814
                        s->macroblock_fragments[current_macroblock * 6 + k];
815
                    if (current_fragment == -1)
816
                        continue;
817
                    if (current_fragment >= s->fragment_count) {
818
                        av_log(s->avctx, AV_LOG_ERROR, "  vp3:unpack_modes(): bad fragment number (%d >= %d)\n",
819
                            current_fragment, s->fragment_count);
820
                        return 1;
821
                    }
822
                    if (s->all_fragments[current_fragment].coding_method !=
823
                        MODE_COPY)
824
                        s->all_fragments[current_fragment].coding_method =
825
                            coding_mode;
826
                }
827
            }
828
        }
829
    }
830

    
831
    return 0;
832
}
833

    
834
/*
835
 * This function unpacks all the motion vectors for the individual
836
 * macroblocks from the bitstream.
837
 */
838
static int unpack_vectors(Vp3DecodeContext *s, GetBitContext *gb)
839
{
840
    int i, j, k, l;
841
    int coding_mode;
842
    int motion_x[6];
843
    int motion_y[6];
844
    int last_motion_x = 0;
845
    int last_motion_y = 0;
846
    int prior_last_motion_x = 0;
847
    int prior_last_motion_y = 0;
848
    int current_macroblock;
849
    int current_fragment;
850

    
851
    if (s->keyframe)
852
        return 0;
853

    
854
    memset(motion_x, 0, 6 * sizeof(int));
855
    memset(motion_y, 0, 6 * sizeof(int));
856

    
857
    /* coding mode 0 is the VLC scheme; 1 is the fixed code scheme */
858
    coding_mode = get_bits1(gb);
859

    
860
    /* iterate through all of the macroblocks that contain 1 or more
861
     * coded fragments */
862
    for (i = 0; i < s->u_superblock_start; i++) {
863

    
864
        for (j = 0; j < 4; j++) {
865
            current_macroblock = s->superblock_macroblocks[i * 4 + j];
866
            if ((current_macroblock == -1) ||
867
                (s->macroblock_coding[current_macroblock] == MODE_COPY))
868
                continue;
869
            if (current_macroblock >= s->macroblock_count) {
870
                av_log(s->avctx, AV_LOG_ERROR, "  vp3:unpack_vectors(): bad macroblock number (%d >= %d)\n",
871
                    current_macroblock, s->macroblock_count);
872
                return 1;
873
            }
874

    
875
            current_fragment = s->macroblock_fragments[current_macroblock * 6];
876
            if (current_fragment >= s->fragment_count) {
877
                av_log(s->avctx, AV_LOG_ERROR, "  vp3:unpack_vectors(): bad fragment number (%d >= %d\n",
878
                    current_fragment, s->fragment_count);
879
                return 1;
880
            }
881
            switch (s->macroblock_coding[current_macroblock]) {
882

    
883
            case MODE_INTER_PLUS_MV:
884
            case MODE_GOLDEN_MV:
885
                /* all 6 fragments use the same motion vector */
886
                if (coding_mode == 0) {
887
                    motion_x[0] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)];
888
                    motion_y[0] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)];
889
                } else {
890
                    motion_x[0] = fixed_motion_vector_table[get_bits(gb, 6)];
891
                    motion_y[0] = fixed_motion_vector_table[get_bits(gb, 6)];
892
                }
893

    
894
                for (k = 1; k < 6; k++) {
895
                    motion_x[k] = motion_x[0];
896
                    motion_y[k] = motion_y[0];
897
                }
898

    
899
                /* vector maintenance, only on MODE_INTER_PLUS_MV */
900
                if (s->macroblock_coding[current_macroblock] ==
901
                    MODE_INTER_PLUS_MV) {
902
                    prior_last_motion_x = last_motion_x;
903
                    prior_last_motion_y = last_motion_y;
904
                    last_motion_x = motion_x[0];
905
                    last_motion_y = motion_y[0];
906
                }
907
                break;
908

    
909
            case MODE_INTER_FOURMV:
910
                /* vector maintenance */
911
                prior_last_motion_x = last_motion_x;
912
                prior_last_motion_y = last_motion_y;
913

    
914
                /* fetch 4 vectors from the bitstream, one for each
915
                 * Y fragment, then average for the C fragment vectors */
916
                motion_x[4] = motion_y[4] = 0;
917
                for (k = 0; k < 4; k++) {
918
                    for (l = 0; l < s->coded_fragment_list_index; l++)
919
                        if (s->coded_fragment_list[l] == s->macroblock_fragments[6*current_macroblock + k])
920
                            break;
921
                    if (l < s->coded_fragment_list_index) {
922
                        if (coding_mode == 0) {
923
                            motion_x[k] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)];
924
                            motion_y[k] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)];
925
                        } else {
926
                            motion_x[k] = fixed_motion_vector_table[get_bits(gb, 6)];
927
                            motion_y[k] = fixed_motion_vector_table[get_bits(gb, 6)];
928
                        }
929
                        last_motion_x = motion_x[k];
930
                        last_motion_y = motion_y[k];
931
                    } else {
932
                        motion_x[k] = 0;
933
                        motion_y[k] = 0;
934
                    }
935
                    motion_x[4] += motion_x[k];
936
                    motion_y[4] += motion_y[k];
937
                }
938

    
939
                motion_x[5]=
940
                motion_x[4]= RSHIFT(motion_x[4], 2);
941
                motion_y[5]=
942
                motion_y[4]= RSHIFT(motion_y[4], 2);
943
                break;
944

    
945
            case MODE_INTER_LAST_MV:
946
                /* all 6 fragments use the last motion vector */
947
                motion_x[0] = last_motion_x;
948
                motion_y[0] = last_motion_y;
949
                for (k = 1; k < 6; k++) {
950
                    motion_x[k] = motion_x[0];
951
                    motion_y[k] = motion_y[0];
952
                }
953

    
954
                /* no vector maintenance (last vector remains the
955
                 * last vector) */
956
                break;
957

    
958
            case MODE_INTER_PRIOR_LAST:
959
                /* all 6 fragments use the motion vector prior to the
960
                 * last motion vector */
961
                motion_x[0] = prior_last_motion_x;
962
                motion_y[0] = prior_last_motion_y;
963
                for (k = 1; k < 6; k++) {
964
                    motion_x[k] = motion_x[0];
965
                    motion_y[k] = motion_y[0];
966
                }
967

    
968
                /* vector maintenance */
969
                prior_last_motion_x = last_motion_x;
970
                prior_last_motion_y = last_motion_y;
971
                last_motion_x = motion_x[0];
972
                last_motion_y = motion_y[0];
973
                break;
974

    
975
            default:
976
                /* covers intra, inter without MV, golden without MV */
977
                memset(motion_x, 0, 6 * sizeof(int));
978
                memset(motion_y, 0, 6 * sizeof(int));
979

    
980
                /* no vector maintenance */
981
                break;
982
            }
983

    
984
            /* assign the motion vectors to the correct fragments */
985
            for (k = 0; k < 6; k++) {
986
                current_fragment =
987
                    s->macroblock_fragments[current_macroblock * 6 + k];
988
                if (current_fragment == -1)
989
                    continue;
990
                if (current_fragment >= s->fragment_count) {
991
                    av_log(s->avctx, AV_LOG_ERROR, "  vp3:unpack_vectors(): bad fragment number (%d >= %d)\n",
992
                        current_fragment, s->fragment_count);
993
                    return 1;
994
                }
995
                s->all_fragments[current_fragment].motion_x = motion_x[k];
996
                s->all_fragments[current_fragment].motion_y = motion_y[k];
997
            }
998
        }
999
    }
1000

    
1001
    return 0;
1002
}
1003

    
1004
static int unpack_block_qpis(Vp3DecodeContext *s, GetBitContext *gb)
1005
{
1006
    int qpi, i, j, bit, run_length, blocks_decoded, num_blocks_at_qpi;
1007
    int num_blocks = s->coded_fragment_list_index;
1008

    
1009
    for (qpi = 0; qpi < s->nqps-1 && num_blocks > 0; qpi++) {
1010
        i = blocks_decoded = num_blocks_at_qpi = 0;
1011

    
1012
        bit = get_bits1(gb);
1013

    
1014
        do {
1015
            run_length = get_vlc2(gb, s->superblock_run_length_vlc.table, 6, 2) + 1;
1016
            if (run_length == 34)
1017
                run_length += get_bits(gb, 12);
1018
            blocks_decoded += run_length;
1019

    
1020
            if (!bit)
1021
                num_blocks_at_qpi += run_length;
1022

    
1023
            for (j = 0; j < run_length; i++) {
1024
                if (i >= s->coded_fragment_list_index)
1025
                    return -1;
1026

    
1027
                if (s->all_fragments[s->coded_fragment_list[i]].qpi == qpi) {
1028
                    s->all_fragments[s->coded_fragment_list[i]].qpi += bit;
1029
                    j++;
1030
                }
1031
            }
1032

    
1033
            if (run_length == 4129)
1034
                bit = get_bits1(gb);
1035
            else
1036
                bit ^= 1;
1037
        } while (blocks_decoded < num_blocks);
1038

    
1039
        num_blocks -= num_blocks_at_qpi;
1040
    }
1041

    
1042
    return 0;
1043
}
1044

    
1045
/*
1046
 * This function is called by unpack_dct_coeffs() to extract the VLCs from
1047
 * the bitstream. The VLCs encode tokens which are used to unpack DCT
1048
 * data. This function unpacks all the VLCs for either the Y plane or both
1049
 * C planes, and is called for DC coefficients or different AC coefficient
1050
 * levels (since different coefficient types require different VLC tables.
1051
 *
1052
 * This function returns a residual eob run. E.g, if a particular token gave
1053
 * instructions to EOB the next 5 fragments and there were only 2 fragments
1054
 * left in the current fragment range, 3 would be returned so that it could
1055
 * be passed into the next call to this same function.
1056
 */
1057
static int unpack_vlcs(Vp3DecodeContext *s, GetBitContext *gb,
1058
                        VLC *table, int coeff_index,
1059
                        int y_plane,
1060
                        int eob_run)
1061
{
1062
    int i;
1063
    int token;
1064
    int zero_run = 0;
1065
    DCTELEM coeff = 0;
1066
    Vp3Fragment *fragment;
1067
    int bits_to_get;
1068
    int next_fragment;
1069
    int previous_fragment;
1070
    int fragment_num;
1071
    int *list_head;
1072

    
1073
    /* local references to structure members to avoid repeated deferences */
1074
    uint8_t *perm= s->scantable.permutated;
1075
    int *coded_fragment_list = s->coded_fragment_list;
1076
    Vp3Fragment *all_fragments = s->all_fragments;
1077
    uint8_t *coeff_counts = s->coeff_counts;
1078
    VLC_TYPE (*vlc_table)[2] = table->table;
1079
    int *fast_fragment_list = s->fast_fragment_list;
1080

    
1081
    if (y_plane) {
1082
        next_fragment = s->fragment_list_y_head;
1083
        list_head = &s->fragment_list_y_head;
1084
    } else {
1085
        next_fragment = s->fragment_list_c_head;
1086
        list_head = &s->fragment_list_c_head;
1087
    }
1088

    
1089
    i = next_fragment;
1090
    previous_fragment = -1;  /* this indicates that the previous fragment is actually the list head */
1091
    while (i != -1) {
1092
        fragment_num = coded_fragment_list[i];
1093

    
1094
        if (coeff_counts[fragment_num] > coeff_index) {
1095
            previous_fragment = i;
1096
            i = fast_fragment_list[i];
1097
            continue;
1098
        }
1099
        fragment = &all_fragments[fragment_num];
1100

    
1101
        if (!eob_run) {
1102
            /* decode a VLC into a token */
1103
            token = get_vlc2(gb, vlc_table, 5, 3);
1104
            /* use the token to get a zero run, a coefficient, and an eob run */
1105
            if (token <= 6) {
1106
                eob_run = eob_run_base[token];
1107
                if (eob_run_get_bits[token])
1108
                    eob_run += get_bits(gb, eob_run_get_bits[token]);
1109
                coeff = zero_run = 0;
1110
            } else {
1111
                bits_to_get = coeff_get_bits[token];
1112
                if (bits_to_get)
1113
                    bits_to_get = get_bits(gb, bits_to_get);
1114
                coeff = coeff_tables[token][bits_to_get];
1115

    
1116
                zero_run = zero_run_base[token];
1117
                if (zero_run_get_bits[token])
1118
                    zero_run += get_bits(gb, zero_run_get_bits[token]);
1119
            }
1120
        }
1121

    
1122
        if (!eob_run) {
1123
            coeff_counts[fragment_num] += zero_run;
1124
            if (coeff_counts[fragment_num] < 64){
1125
                fragment->next_coeff->coeff= coeff;
1126
                fragment->next_coeff->index= perm[coeff_counts[fragment_num]++]; //FIXME perm here already?
1127
                fragment->next_coeff->next= s->next_coeff;
1128
                s->next_coeff->next=NULL;
1129
                fragment->next_coeff= s->next_coeff++;
1130
            }
1131
            /* previous fragment is now this fragment */
1132
            previous_fragment = i;
1133
        } else {
1134
            coeff_counts[fragment_num] |= 128;
1135
            eob_run--;
1136
            /* remove this fragment from the list */
1137
            if (previous_fragment != -1)
1138
                fast_fragment_list[previous_fragment] = fast_fragment_list[i];
1139
            else
1140
                *list_head = fast_fragment_list[i];
1141
            /* previous fragment remains unchanged */
1142
        }
1143

    
1144
        i = fast_fragment_list[i];
1145
    }
1146

    
1147
    return eob_run;
1148
}
1149

    
1150
static void reverse_dc_prediction(Vp3DecodeContext *s,
1151
                                  int first_fragment,
1152
                                  int fragment_width,
1153
                                  int fragment_height);
1154
/*
1155
 * This function unpacks all of the DCT coefficient data from the
1156
 * bitstream.
1157
 */
1158
static int unpack_dct_coeffs(Vp3DecodeContext *s, GetBitContext *gb)
1159
{
1160
    int i;
1161
    int dc_y_table;
1162
    int dc_c_table;
1163
    int ac_y_table;
1164
    int ac_c_table;
1165
    int residual_eob_run = 0;
1166
    VLC *y_tables[64];
1167
    VLC *c_tables[64];
1168

    
1169
    /* fetch the DC table indexes */
1170
    dc_y_table = get_bits(gb, 4);
1171
    dc_c_table = get_bits(gb, 4);
1172

    
1173
    /* unpack the Y plane DC coefficients */
1174
    residual_eob_run = unpack_vlcs(s, gb, &s->dc_vlc[dc_y_table], 0,
1175
        1, residual_eob_run);
1176

    
1177
    /* reverse prediction of the Y-plane DC coefficients */
1178
    reverse_dc_prediction(s, 0, s->fragment_width, s->fragment_height);
1179

    
1180
    /* unpack the C plane DC coefficients */
1181
    residual_eob_run = unpack_vlcs(s, gb, &s->dc_vlc[dc_c_table], 0,
1182
        0, residual_eob_run);
1183

    
1184
    /* reverse prediction of the C-plane DC coefficients */
1185
    if (!(s->avctx->flags & CODEC_FLAG_GRAY))
1186
    {
1187
        reverse_dc_prediction(s, s->fragment_start[1],
1188
            s->fragment_width / 2, s->fragment_height / 2);
1189
        reverse_dc_prediction(s, s->fragment_start[2],
1190
            s->fragment_width / 2, s->fragment_height / 2);
1191
    }
1192

    
1193
    /* fetch the AC table indexes */
1194
    ac_y_table = get_bits(gb, 4);
1195
    ac_c_table = get_bits(gb, 4);
1196

    
1197
    /* build tables of AC VLC tables */
1198
    for (i = 1; i <= 5; i++) {
1199
        y_tables[i] = &s->ac_vlc_1[ac_y_table];
1200
        c_tables[i] = &s->ac_vlc_1[ac_c_table];
1201
    }
1202
    for (i = 6; i <= 14; i++) {
1203
        y_tables[i] = &s->ac_vlc_2[ac_y_table];
1204
        c_tables[i] = &s->ac_vlc_2[ac_c_table];
1205
    }
1206
    for (i = 15; i <= 27; i++) {
1207
        y_tables[i] = &s->ac_vlc_3[ac_y_table];
1208
        c_tables[i] = &s->ac_vlc_3[ac_c_table];
1209
    }
1210
    for (i = 28; i <= 63; i++) {
1211
        y_tables[i] = &s->ac_vlc_4[ac_y_table];
1212
        c_tables[i] = &s->ac_vlc_4[ac_c_table];
1213
    }
1214

    
1215
    /* decode all AC coefficents */
1216
    for (i = 1; i <= 63; i++) {
1217
        if (s->fragment_list_y_head != -1)
1218
            residual_eob_run = unpack_vlcs(s, gb, y_tables[i], i,
1219
                1, residual_eob_run);
1220

    
1221
        if (s->fragment_list_c_head != -1)
1222
            residual_eob_run = unpack_vlcs(s, gb, c_tables[i], i,
1223
                0, residual_eob_run);
1224
    }
1225

    
1226
    return 0;
1227
}
1228

    
1229
/*
1230
 * This function reverses the DC prediction for each coded fragment in
1231
 * the frame. Much of this function is adapted directly from the original
1232
 * VP3 source code.
1233
 */
1234
#define COMPATIBLE_FRAME(x) \
1235
  (compatible_frame[s->all_fragments[x].coding_method] == current_frame_type)
1236
#define DC_COEFF(u) (s->coeffs[u].index ? 0 : s->coeffs[u].coeff) //FIXME do somethin to simplify this
1237

    
1238
static void reverse_dc_prediction(Vp3DecodeContext *s,
1239
                                  int first_fragment,
1240
                                  int fragment_width,
1241
                                  int fragment_height)
1242
{
1243

    
1244
#define PUL 8
1245
#define PU 4
1246
#define PUR 2
1247
#define PL 1
1248

    
1249
    int x, y;
1250
    int i = first_fragment;
1251

    
1252
    int predicted_dc;
1253

    
1254
    /* DC values for the left, up-left, up, and up-right fragments */
1255
    int vl, vul, vu, vur;
1256

    
1257
    /* indexes for the left, up-left, up, and up-right fragments */
1258
    int l, ul, u, ur;
1259

    
1260
    /*
1261
     * The 6 fields mean:
1262
     *   0: up-left multiplier
1263
     *   1: up multiplier
1264
     *   2: up-right multiplier
1265
     *   3: left multiplier
1266
     */
1267
    static const int predictor_transform[16][4] = {
1268
        {  0,  0,  0,  0},
1269
        {  0,  0,  0,128},        // PL
1270
        {  0,  0,128,  0},        // PUR
1271
        {  0,  0, 53, 75},        // PUR|PL
1272
        {  0,128,  0,  0},        // PU
1273
        {  0, 64,  0, 64},        // PU|PL
1274
        {  0,128,  0,  0},        // PU|PUR
1275
        {  0,  0, 53, 75},        // PU|PUR|PL
1276
        {128,  0,  0,  0},        // PUL
1277
        {  0,  0,  0,128},        // PUL|PL
1278
        { 64,  0, 64,  0},        // PUL|PUR
1279
        {  0,  0, 53, 75},        // PUL|PUR|PL
1280
        {  0,128,  0,  0},        // PUL|PU
1281
       {-104,116,  0,116},        // PUL|PU|PL
1282
        { 24, 80, 24,  0},        // PUL|PU|PUR
1283
       {-104,116,  0,116}         // PUL|PU|PUR|PL
1284
    };
1285

    
1286
    /* This table shows which types of blocks can use other blocks for
1287
     * prediction. For example, INTRA is the only mode in this table to
1288
     * have a frame number of 0. That means INTRA blocks can only predict
1289
     * from other INTRA blocks. There are 2 golden frame coding types;
1290
     * blocks encoding in these modes can only predict from other blocks
1291
     * that were encoded with these 1 of these 2 modes. */
1292
    static const unsigned char compatible_frame[9] = {
1293
        1,    /* MODE_INTER_NO_MV */
1294
        0,    /* MODE_INTRA */
1295
        1,    /* MODE_INTER_PLUS_MV */
1296
        1,    /* MODE_INTER_LAST_MV */
1297
        1,    /* MODE_INTER_PRIOR_MV */
1298
        2,    /* MODE_USING_GOLDEN */
1299
        2,    /* MODE_GOLDEN_MV */
1300
        1,    /* MODE_INTER_FOUR_MV */
1301
        3     /* MODE_COPY */
1302
    };
1303
    int current_frame_type;
1304

    
1305
    /* there is a last DC predictor for each of the 3 frame types */
1306
    short last_dc[3];
1307

    
1308
    int transform = 0;
1309

    
1310
    vul = vu = vur = vl = 0;
1311
    last_dc[0] = last_dc[1] = last_dc[2] = 0;
1312

    
1313
    /* for each fragment row... */
1314
    for (y = 0; y < fragment_height; y++) {
1315

    
1316
        /* for each fragment in a row... */
1317
        for (x = 0; x < fragment_width; x++, i++) {
1318

    
1319
            /* reverse prediction if this block was coded */
1320
            if (s->all_fragments[i].coding_method != MODE_COPY) {
1321

    
1322
                current_frame_type =
1323
                    compatible_frame[s->all_fragments[i].coding_method];
1324

    
1325
                transform= 0;
1326
                if(x){
1327
                    l= i-1;
1328
                    vl = DC_COEFF(l);
1329
                    if(COMPATIBLE_FRAME(l))
1330
                        transform |= PL;
1331
                }
1332
                if(y){
1333
                    u= i-fragment_width;
1334
                    vu = DC_COEFF(u);
1335
                    if(COMPATIBLE_FRAME(u))
1336
                        transform |= PU;
1337
                    if(x){
1338
                        ul= i-fragment_width-1;
1339
                        vul = DC_COEFF(ul);
1340
                        if(COMPATIBLE_FRAME(ul))
1341
                            transform |= PUL;
1342
                    }
1343
                    if(x + 1 < fragment_width){
1344
                        ur= i-fragment_width+1;
1345
                        vur = DC_COEFF(ur);
1346
                        if(COMPATIBLE_FRAME(ur))
1347
                            transform |= PUR;
1348
                    }
1349
                }
1350

    
1351
                if (transform == 0) {
1352

    
1353
                    /* if there were no fragments to predict from, use last
1354
                     * DC saved */
1355
                    predicted_dc = last_dc[current_frame_type];
1356
                } else {
1357

    
1358
                    /* apply the appropriate predictor transform */
1359
                    predicted_dc =
1360
                        (predictor_transform[transform][0] * vul) +
1361
                        (predictor_transform[transform][1] * vu) +
1362
                        (predictor_transform[transform][2] * vur) +
1363
                        (predictor_transform[transform][3] * vl);
1364

    
1365
                    predicted_dc /= 128;
1366

    
1367
                    /* check for outranging on the [ul u l] and
1368
                     * [ul u ur l] predictors */
1369
                    if ((transform == 15) || (transform == 13)) {
1370
                        if (FFABS(predicted_dc - vu) > 128)
1371
                            predicted_dc = vu;
1372
                        else if (FFABS(predicted_dc - vl) > 128)
1373
                            predicted_dc = vl;
1374
                        else if (FFABS(predicted_dc - vul) > 128)
1375
                            predicted_dc = vul;
1376
                    }
1377
                }
1378

    
1379
                /* at long last, apply the predictor */
1380
                if(s->coeffs[i].index){
1381
                    *s->next_coeff= s->coeffs[i];
1382
                    s->coeffs[i].index=0;
1383
                    s->coeffs[i].coeff=0;
1384
                    s->coeffs[i].next= s->next_coeff++;
1385
                }
1386
                s->coeffs[i].coeff += predicted_dc;
1387
                /* save the DC */
1388
                last_dc[current_frame_type] = DC_COEFF(i);
1389
                if(DC_COEFF(i) && !(s->coeff_counts[i]&127)){
1390
                    s->coeff_counts[i]= 129;
1391
//                    s->all_fragments[i].next_coeff= s->next_coeff;
1392
                    s->coeffs[i].next= s->next_coeff;
1393
                    (s->next_coeff++)->next=NULL;
1394
                }
1395
            }
1396
        }
1397
    }
1398
}
1399

    
1400
/*
1401
 * Perform the final rendering for a particular slice of data.
1402
 * The slice number ranges from 0..(macroblock_height - 1).
1403
 */
1404
static void render_slice(Vp3DecodeContext *s, int slice)
1405
{
1406
    int x;
1407
    int16_t *dequantizer;
1408
    DECLARE_ALIGNED_16(DCTELEM, block[64]);
1409
    int motion_x = 0xdeadbeef, motion_y = 0xdeadbeef;
1410
    int motion_halfpel_index;
1411
    uint8_t *motion_source;
1412
    int plane;
1413
    int current_macroblock_entry = slice * s->macroblock_width * 6;
1414

    
1415
    if (slice >= s->macroblock_height)
1416
        return;
1417

    
1418
    for (plane = 0; plane < 3; plane++) {
1419
        uint8_t *output_plane = s->current_frame.data    [plane];
1420
        uint8_t *  last_plane = s->   last_frame.data    [plane];
1421
        uint8_t *golden_plane = s-> golden_frame.data    [plane];
1422
        int stride            = s->current_frame.linesize[plane];
1423
        int plane_width       = s->width  >> !!plane;
1424
        int plane_height      = s->height >> !!plane;
1425
        int y =        slice *  FRAGMENT_PIXELS << !plane ;
1426
        int slice_height = y + (FRAGMENT_PIXELS << !plane);
1427
        int i = s->macroblock_fragments[current_macroblock_entry + plane + 3*!!plane];
1428

    
1429
        if (!s->flipped_image) stride = -stride;
1430

    
1431

    
1432
        if(FFABS(stride) > 2048)
1433
            return; //various tables are fixed size
1434

    
1435
        /* for each fragment row in the slice (both of them)... */
1436
        for (; y < slice_height; y += 8) {
1437

    
1438
            /* for each fragment in a row... */
1439
            for (x = 0; x < plane_width; x += 8, i++) {
1440

    
1441
                if ((i < 0) || (i >= s->fragment_count)) {
1442
                    av_log(s->avctx, AV_LOG_ERROR, "  vp3:render_slice(): bad fragment number (%d)\n", i);
1443
                    return;
1444
                }
1445

    
1446
                /* transform if this block was coded */
1447
                if ((s->all_fragments[i].coding_method != MODE_COPY) &&
1448
                    !((s->avctx->flags & CODEC_FLAG_GRAY) && plane)) {
1449

    
1450
                    if ((s->all_fragments[i].coding_method == MODE_USING_GOLDEN) ||
1451
                        (s->all_fragments[i].coding_method == MODE_GOLDEN_MV))
1452
                        motion_source= golden_plane;
1453
                    else
1454
                        motion_source= last_plane;
1455

    
1456
                    motion_source += s->all_fragments[i].first_pixel;
1457
                    motion_halfpel_index = 0;
1458

    
1459
                    /* sort out the motion vector if this fragment is coded
1460
                     * using a motion vector method */
1461
                    if ((s->all_fragments[i].coding_method > MODE_INTRA) &&
1462
                        (s->all_fragments[i].coding_method != MODE_USING_GOLDEN)) {
1463
                        int src_x, src_y;
1464
                        motion_x = s->all_fragments[i].motion_x;
1465
                        motion_y = s->all_fragments[i].motion_y;
1466
                        if(plane){
1467
                            motion_x= (motion_x>>1) | (motion_x&1);
1468
                            motion_y= (motion_y>>1) | (motion_y&1);
1469
                        }
1470

    
1471
                        src_x= (motion_x>>1) + x;
1472
                        src_y= (motion_y>>1) + y;
1473
                        if ((motion_x == 127) || (motion_y == 127))
1474
                            av_log(s->avctx, AV_LOG_ERROR, " help! got invalid motion vector! (%X, %X)\n", motion_x, motion_y);
1475

    
1476
                        motion_halfpel_index = motion_x & 0x01;
1477
                        motion_source += (motion_x >> 1);
1478

    
1479
                        motion_halfpel_index |= (motion_y & 0x01) << 1;
1480
                        motion_source += ((motion_y >> 1) * stride);
1481

    
1482
                        if(src_x<0 || src_y<0 || src_x + 9 >= plane_width || src_y + 9 >= plane_height){
1483
                            uint8_t *temp= s->edge_emu_buffer;
1484
                            if(stride<0) temp -= 9*stride;
1485
                            else temp += 9*stride;
1486

    
1487
                            ff_emulated_edge_mc(temp, motion_source, stride, 9, 9, src_x, src_y, plane_width, plane_height);
1488
                            motion_source= temp;
1489
                        }
1490
                    }
1491

    
1492

    
1493
                    /* first, take care of copying a block from either the
1494
                     * previous or the golden frame */
1495
                    if (s->all_fragments[i].coding_method != MODE_INTRA) {
1496
                        /* Note, it is possible to implement all MC cases with
1497
                           put_no_rnd_pixels_l2 which would look more like the
1498
                           VP3 source but this would be slower as
1499
                           put_no_rnd_pixels_tab is better optimzed */
1500
                        if(motion_halfpel_index != 3){
1501
                            s->dsp.put_no_rnd_pixels_tab[1][motion_halfpel_index](
1502
                                output_plane + s->all_fragments[i].first_pixel,
1503
                                motion_source, stride, 8);
1504
                        }else{
1505
                            int d= (motion_x ^ motion_y)>>31; // d is 0 if motion_x and _y have the same sign, else -1
1506
                            s->dsp.put_no_rnd_pixels_l2[1](
1507
                                output_plane + s->all_fragments[i].first_pixel,
1508
                                motion_source - d,
1509
                                motion_source + stride + 1 + d,
1510
                                stride, 8);
1511
                        }
1512
                        dequantizer = s->qmat[s->all_fragments[i].qpi][1][plane];
1513
                    }else{
1514
                        dequantizer = s->qmat[s->all_fragments[i].qpi][0][plane];
1515
                    }
1516

    
1517
                    /* dequantize the DCT coefficients */
1518
                    if(s->avctx->idct_algo==FF_IDCT_VP3){
1519
                        Coeff *coeff= s->coeffs + i;
1520
                        s->dsp.clear_block(block);
1521
                        while(coeff->next){
1522
                            block[coeff->index]= coeff->coeff * dequantizer[coeff->index];
1523
                            coeff= coeff->next;
1524
                        }
1525
                    }else{
1526
                        Coeff *coeff= s->coeffs + i;
1527
                        s->dsp.clear_block(block);
1528
                        while(coeff->next){
1529
                            block[coeff->index]= (coeff->coeff * dequantizer[coeff->index] + 2)>>2;
1530
                            coeff= coeff->next;
1531
                        }
1532
                    }
1533

    
1534
                    /* invert DCT and place (or add) in final output */
1535

    
1536
                    if (s->all_fragments[i].coding_method == MODE_INTRA) {
1537
                        if(s->avctx->idct_algo!=FF_IDCT_VP3)
1538
                            block[0] += 128<<3;
1539
                        s->dsp.idct_put(
1540
                            output_plane + s->all_fragments[i].first_pixel,
1541
                            stride,
1542
                            block);
1543
                    } else {
1544
                        s->dsp.idct_add(
1545
                            output_plane + s->all_fragments[i].first_pixel,
1546
                            stride,
1547
                            block);
1548
                    }
1549
                } else {
1550

    
1551
                    /* copy directly from the previous frame */
1552
                    s->dsp.put_pixels_tab[1][0](
1553
                        output_plane + s->all_fragments[i].first_pixel,
1554
                        last_plane + s->all_fragments[i].first_pixel,
1555
                        stride, 8);
1556

    
1557
                }
1558
#if 0
1559
                /* perform the left edge filter if:
1560
                 *   - the fragment is not on the left column
1561
                 *   - the fragment is coded in this frame
1562
                 *   - the fragment is not coded in this frame but the left
1563
                 *     fragment is coded in this frame (this is done instead
1564
                 *     of a right edge filter when rendering the left fragment
1565
                 *     since this fragment is not available yet) */
1566
                if ((x > 0) &&
1567
                    ((s->all_fragments[i].coding_method != MODE_COPY) ||
1568
                     ((s->all_fragments[i].coding_method == MODE_COPY) &&
1569
                      (s->all_fragments[i - 1].coding_method != MODE_COPY)) )) {
1570
                    horizontal_filter(
1571
                        output_plane + s->all_fragments[i].first_pixel + 7*stride,
1572
                        -stride, s->bounding_values_array + 127);
1573
                }
1574

1575
                /* perform the top edge filter if:
1576
                 *   - the fragment is not on the top row
1577
                 *   - the fragment is coded in this frame
1578
                 *   - the fragment is not coded in this frame but the above
1579
                 *     fragment is coded in this frame (this is done instead
1580
                 *     of a bottom edge filter when rendering the above
1581
                 *     fragment since this fragment is not available yet) */
1582
                if ((y > 0) &&
1583
                    ((s->all_fragments[i].coding_method != MODE_COPY) ||
1584
                     ((s->all_fragments[i].coding_method == MODE_COPY) &&
1585
                      (s->all_fragments[i - fragment_width].coding_method != MODE_COPY)) )) {
1586
                    vertical_filter(
1587
                        output_plane + s->all_fragments[i].first_pixel - stride,
1588
                        -stride, s->bounding_values_array + 127);
1589
                }
1590
#endif
1591
            }
1592
        }
1593
    }
1594

    
1595
     /* this looks like a good place for slice dispatch... */
1596
     /* algorithm:
1597
      *   if (slice == s->macroblock_height - 1)
1598
      *     dispatch (both last slice & 2nd-to-last slice);
1599
      *   else if (slice > 0)
1600
      *     dispatch (slice - 1);
1601
      */
1602

    
1603
    emms_c();
1604
}
1605

    
1606
static void apply_loop_filter(Vp3DecodeContext *s)
1607
{
1608
    int plane;
1609
    int x, y;
1610
    int *bounding_values= s->bounding_values_array+127;
1611

    
1612
#if 0
1613
    int bounding_values_array[256];
1614
    int filter_limit;
1615

1616
    /* find the right loop limit value */
1617
    for (x = 63; x >= 0; x--) {
1618
        if (vp31_ac_scale_factor[x] >= s->quality_index)
1619
            break;
1620
    }
1621
    filter_limit = vp31_filter_limit_values[s->quality_index];
1622

1623
    /* set up the bounding values */
1624
    memset(bounding_values_array, 0, 256 * sizeof(int));
1625
    for (x = 0; x < filter_limit; x++) {
1626
        bounding_values[-x - filter_limit] = -filter_limit + x;
1627
        bounding_values[-x] = -x;
1628
        bounding_values[x] = x;
1629
        bounding_values[x + filter_limit] = filter_limit - x;
1630
    }
1631
#endif
1632

    
1633
    for (plane = 0; plane < 3; plane++) {
1634
        int width           = s->fragment_width  >> !!plane;
1635
        int height          = s->fragment_height >> !!plane;
1636
        int fragment        = s->fragment_start        [plane];
1637
        int stride          = s->current_frame.linesize[plane];
1638
        uint8_t *plane_data = s->current_frame.data    [plane];
1639
        if (!s->flipped_image) stride = -stride;
1640

    
1641
        for (y = 0; y < height; y++) {
1642

    
1643
            for (x = 0; x < width; x++) {
1644
                /* This code basically just deblocks on the edges of coded blocks.
1645
                 * However, it has to be much more complicated because of the
1646
                 * braindamaged deblock ordering used in VP3/Theora. Order matters
1647
                 * because some pixels get filtered twice. */
1648
                if( s->all_fragments[fragment].coding_method != MODE_COPY )
1649
                {
1650
                    /* do not perform left edge filter for left columns frags */
1651
                    if (x > 0) {
1652
                        s->dsp.vp3_h_loop_filter(
1653
                            plane_data + s->all_fragments[fragment].first_pixel,
1654
                            stride, bounding_values);
1655
                    }
1656

    
1657
                    /* do not perform top edge filter for top row fragments */
1658
                    if (y > 0) {
1659
                        s->dsp.vp3_v_loop_filter(
1660
                            plane_data + s->all_fragments[fragment].first_pixel,
1661
                            stride, bounding_values);
1662
                    }
1663

    
1664
                    /* do not perform right edge filter for right column
1665
                     * fragments or if right fragment neighbor is also coded
1666
                     * in this frame (it will be filtered in next iteration) */
1667
                    if ((x < width - 1) &&
1668
                        (s->all_fragments[fragment + 1].coding_method == MODE_COPY)) {
1669
                        s->dsp.vp3_h_loop_filter(
1670
                            plane_data + s->all_fragments[fragment + 1].first_pixel,
1671
                            stride, bounding_values);
1672
                    }
1673

    
1674
                    /* do not perform bottom edge filter for bottom row
1675
                     * fragments or if bottom fragment neighbor is also coded
1676
                     * in this frame (it will be filtered in the next row) */
1677
                    if ((y < height - 1) &&
1678
                        (s->all_fragments[fragment + width].coding_method == MODE_COPY)) {
1679
                        s->dsp.vp3_v_loop_filter(
1680
                            plane_data + s->all_fragments[fragment + width].first_pixel,
1681
                            stride, bounding_values);
1682
                    }
1683
                }
1684

    
1685
                fragment++;
1686
            }
1687
        }
1688
    }
1689
}
1690

    
1691
/*
1692
 * This function computes the first pixel addresses for each fragment.
1693
 * This function needs to be invoked after the first frame is allocated
1694
 * so that it has access to the plane strides.
1695
 */
1696
static void vp3_calculate_pixel_addresses(Vp3DecodeContext *s)
1697
{
1698
#define Y_INITIAL(chroma_shift)  s->flipped_image ? 1  : s->fragment_height >> chroma_shift
1699
#define Y_FINISHED(chroma_shift) s->flipped_image ? y <= s->fragment_height >> chroma_shift : y > 0
1700

    
1701
    int i, x, y;
1702
    const int y_inc = s->flipped_image ? 1 : -1;
1703

    
1704
    /* figure out the first pixel addresses for each of the fragments */
1705
    /* Y plane */
1706
    i = 0;
1707
    for (y = Y_INITIAL(0); Y_FINISHED(0); y += y_inc) {
1708
        for (x = 0; x < s->fragment_width; x++) {
1709
            s->all_fragments[i++].first_pixel =
1710
                s->golden_frame.linesize[0] * y * FRAGMENT_PIXELS -
1711
                    s->golden_frame.linesize[0] +
1712
                    x * FRAGMENT_PIXELS;
1713
        }
1714
    }
1715

    
1716
    /* U plane */
1717
    i = s->fragment_start[1];
1718
    for (y = Y_INITIAL(1); Y_FINISHED(1); y += y_inc) {
1719
        for (x = 0; x < s->fragment_width / 2; x++) {
1720
            s->all_fragments[i++].first_pixel =
1721
                s->golden_frame.linesize[1] * y * FRAGMENT_PIXELS -
1722
                    s->golden_frame.linesize[1] +
1723
                    x * FRAGMENT_PIXELS;
1724
        }
1725
    }
1726

    
1727
    /* V plane */
1728
    i = s->fragment_start[2];
1729
    for (y = Y_INITIAL(1); Y_FINISHED(1); y += y_inc) {
1730
        for (x = 0; x < s->fragment_width / 2; x++) {
1731
            s->all_fragments[i++].first_pixel =
1732
                s->golden_frame.linesize[2] * y * FRAGMENT_PIXELS -
1733
                    s->golden_frame.linesize[2] +
1734
                    x * FRAGMENT_PIXELS;
1735
        }
1736
    }
1737
}
1738

    
1739
/*
1740
 * This is the ffmpeg/libavcodec API init function.
1741
 */
1742
static av_cold int vp3_decode_init(AVCodecContext *avctx)
1743
{
1744
    Vp3DecodeContext *s = avctx->priv_data;
1745
    int i, inter, plane;
1746
    int c_width;
1747
    int c_height;
1748
    int y_superblock_count;
1749
    int c_superblock_count;
1750

    
1751
    if (avctx->codec_tag == MKTAG('V','P','3','0'))
1752
        s->version = 0;
1753
    else
1754
        s->version = 1;
1755

    
1756
    s->avctx = avctx;
1757
    s->width = FFALIGN(avctx->width, 16);
1758
    s->height = FFALIGN(avctx->height, 16);
1759
    avctx->pix_fmt = PIX_FMT_YUV420P;
1760
    avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1761
    if(avctx->idct_algo==FF_IDCT_AUTO)
1762
        avctx->idct_algo=FF_IDCT_VP3;
1763
    dsputil_init(&s->dsp, avctx);
1764

    
1765
    ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
1766

    
1767
    /* initialize to an impossible value which will force a recalculation
1768
     * in the first frame decode */
1769
    for (i = 0; i < 3; i++)
1770
        s->qps[i] = -1;
1771

    
1772
    s->y_superblock_width = (s->width + 31) / 32;
1773
    s->y_superblock_height = (s->height + 31) / 32;
1774
    y_superblock_count = s->y_superblock_width * s->y_superblock_height;
1775

    
1776
    /* work out the dimensions for the C planes */
1777
    c_width = s->width / 2;
1778
    c_height = s->height / 2;
1779
    s->c_superblock_width = (c_width + 31) / 32;
1780
    s->c_superblock_height = (c_height + 31) / 32;
1781
    c_superblock_count = s->c_superblock_width * s->c_superblock_height;
1782

    
1783
    s->superblock_count = y_superblock_count + (c_superblock_count * 2);
1784
    s->u_superblock_start = y_superblock_count;
1785
    s->v_superblock_start = s->u_superblock_start + c_superblock_count;
1786
    s->superblock_coding = av_malloc(s->superblock_count);
1787

    
1788
    s->macroblock_width = (s->width + 15) / 16;
1789
    s->macroblock_height = (s->height + 15) / 16;
1790
    s->macroblock_count = s->macroblock_width * s->macroblock_height;
1791

    
1792
    s->fragment_width = s->width / FRAGMENT_PIXELS;
1793
    s->fragment_height = s->height / FRAGMENT_PIXELS;
1794

    
1795
    /* fragment count covers all 8x8 blocks for all 3 planes */
1796
    s->fragment_count = s->fragment_width * s->fragment_height * 3 / 2;
1797
    s->fragment_start[1] = s->fragment_width * s->fragment_height;
1798
    s->fragment_start[2] = s->fragment_width * s->fragment_height * 5 / 4;
1799

    
1800
    s->all_fragments = av_malloc(s->fragment_count * sizeof(Vp3Fragment));
1801
    s->coeff_counts = av_malloc(s->fragment_count * sizeof(*s->coeff_counts));
1802
    s->coeffs = av_malloc(s->fragment_count * sizeof(Coeff) * 65);
1803
    s->coded_fragment_list = av_malloc(s->fragment_count * sizeof(int));
1804
    s->fast_fragment_list = av_malloc(s->fragment_count * sizeof(int));
1805
    s->pixel_addresses_initialized = 0;
1806
    if (!s->superblock_coding || !s->all_fragments || !s->coeff_counts ||
1807
        !s->coeffs || !s->coded_fragment_list || !s->fast_fragment_list) {
1808
        vp3_decode_end(avctx);
1809
        return -1;
1810
    }
1811

    
1812
    if (!s->theora_tables)
1813
    {
1814
        for (i = 0; i < 64; i++) {
1815
            s->coded_dc_scale_factor[i] = vp31_dc_scale_factor[i];
1816
            s->coded_ac_scale_factor[i] = vp31_ac_scale_factor[i];
1817
            s->base_matrix[0][i] = vp31_intra_y_dequant[i];
1818
            s->base_matrix[1][i] = vp31_intra_c_dequant[i];
1819
            s->base_matrix[2][i] = vp31_inter_dequant[i];
1820
            s->filter_limit_values[i] = vp31_filter_limit_values[i];
1821
        }
1822

    
1823
        for(inter=0; inter<2; inter++){
1824
            for(plane=0; plane<3; plane++){
1825
                s->qr_count[inter][plane]= 1;
1826
                s->qr_size [inter][plane][0]= 63;
1827
                s->qr_base [inter][plane][0]=
1828
                s->qr_base [inter][plane][1]= 2*inter + (!!plane)*!inter;
1829
            }
1830
        }
1831

    
1832
        /* init VLC tables */
1833
        for (i = 0; i < 16; i++) {
1834

    
1835
            /* DC histograms */
1836
            init_vlc(&s->dc_vlc[i], 5, 32,
1837
                &dc_bias[i][0][1], 4, 2,
1838
                &dc_bias[i][0][0], 4, 2, 0);
1839

    
1840
            /* group 1 AC histograms */
1841
            init_vlc(&s->ac_vlc_1[i], 5, 32,
1842
                &ac_bias_0[i][0][1], 4, 2,
1843
                &ac_bias_0[i][0][0], 4, 2, 0);
1844

    
1845
            /* group 2 AC histograms */
1846
            init_vlc(&s->ac_vlc_2[i], 5, 32,
1847
                &ac_bias_1[i][0][1], 4, 2,
1848
                &ac_bias_1[i][0][0], 4, 2, 0);
1849

    
1850
            /* group 3 AC histograms */
1851
            init_vlc(&s->ac_vlc_3[i], 5, 32,
1852
                &ac_bias_2[i][0][1], 4, 2,
1853
                &ac_bias_2[i][0][0], 4, 2, 0);
1854

    
1855
            /* group 4 AC histograms */
1856
            init_vlc(&s->ac_vlc_4[i], 5, 32,
1857
                &ac_bias_3[i][0][1], 4, 2,
1858
                &ac_bias_3[i][0][0], 4, 2, 0);
1859
        }
1860
    } else {
1861
        for (i = 0; i < 16; i++) {
1862

    
1863
            /* DC histograms */
1864
            if (init_vlc(&s->dc_vlc[i], 5, 32,
1865
                &s->huffman_table[i][0][1], 4, 2,
1866
                &s->huffman_table[i][0][0], 4, 2, 0) < 0)
1867
                goto vlc_fail;
1868

    
1869
            /* group 1 AC histograms */
1870
            if (init_vlc(&s->ac_vlc_1[i], 5, 32,
1871
                &s->huffman_table[i+16][0][1], 4, 2,
1872
                &s->huffman_table[i+16][0][0], 4, 2, 0) < 0)
1873
                goto vlc_fail;
1874

    
1875
            /* group 2 AC histograms */
1876
            if (init_vlc(&s->ac_vlc_2[i], 5, 32,
1877
                &s->huffman_table[i+16*2][0][1], 4, 2,
1878
                &s->huffman_table[i+16*2][0][0], 4, 2, 0) < 0)
1879
                goto vlc_fail;
1880

    
1881
            /* group 3 AC histograms */
1882
            if (init_vlc(&s->ac_vlc_3[i], 5, 32,
1883
                &s->huffman_table[i+16*3][0][1], 4, 2,
1884
                &s->huffman_table[i+16*3][0][0], 4, 2, 0) < 0)
1885
                goto vlc_fail;
1886

    
1887
            /* group 4 AC histograms */
1888
            if (init_vlc(&s->ac_vlc_4[i], 5, 32,
1889
                &s->huffman_table[i+16*4][0][1], 4, 2,
1890
                &s->huffman_table[i+16*4][0][0], 4, 2, 0) < 0)
1891
                goto vlc_fail;
1892
        }
1893
    }
1894

    
1895
    init_vlc(&s->superblock_run_length_vlc, 6, 34,
1896
        &superblock_run_length_vlc_table[0][1], 4, 2,
1897
        &superblock_run_length_vlc_table[0][0], 4, 2, 0);
1898

    
1899
    init_vlc(&s->fragment_run_length_vlc, 5, 30,
1900
        &fragment_run_length_vlc_table[0][1], 4, 2,
1901
        &fragment_run_length_vlc_table[0][0], 4, 2, 0);
1902

    
1903
    init_vlc(&s->mode_code_vlc, 3, 8,
1904
        &mode_code_vlc_table[0][1], 2, 1,
1905
        &mode_code_vlc_table[0][0], 2, 1, 0);
1906

    
1907
    init_vlc(&s->motion_vector_vlc, 6, 63,
1908
        &motion_vector_vlc_table[0][1], 2, 1,
1909
        &motion_vector_vlc_table[0][0], 2, 1, 0);
1910

    
1911
    /* work out the block mapping tables */
1912
    s->superblock_fragments = av_malloc(s->superblock_count * 16 * sizeof(int));
1913
    s->superblock_macroblocks = av_malloc(s->superblock_count * 4 * sizeof(int));
1914
    s->macroblock_fragments = av_malloc(s->macroblock_count * 6 * sizeof(int));
1915
    s->macroblock_coding = av_malloc(s->macroblock_count + 1);
1916
    if (!s->superblock_fragments || !s->superblock_macroblocks ||
1917
        !s->macroblock_fragments || !s->macroblock_coding) {
1918
        vp3_decode_end(avctx);
1919
        return -1;
1920
    }
1921
    init_block_mapping(s);
1922

    
1923
    for (i = 0; i < 3; i++) {
1924
        s->current_frame.data[i] = NULL;
1925
        s->last_frame.data[i] = NULL;
1926
        s->golden_frame.data[i] = NULL;
1927
    }
1928

    
1929
    return 0;
1930

    
1931
vlc_fail:
1932
    av_log(avctx, AV_LOG_FATAL, "Invalid huffman table\n");
1933
    return -1;
1934
}
1935

    
1936
/*
1937
 * This is the ffmpeg/libavcodec API frame decode function.
1938
 */
1939
static int vp3_decode_frame(AVCodecContext *avctx,
1940
                            void *data, int *data_size,
1941
                            AVPacket *avpkt)
1942
{
1943
    const uint8_t *buf = avpkt->data;
1944
    int buf_size = avpkt->size;
1945
    Vp3DecodeContext *s = avctx->priv_data;
1946
    GetBitContext gb;
1947
    static int counter = 0;
1948
    int i;
1949

    
1950
    init_get_bits(&gb, buf, buf_size * 8);
1951

    
1952
    if (s->theora && get_bits1(&gb))
1953
    {
1954
        av_log(avctx, AV_LOG_ERROR, "Header packet passed to frame decoder, skipping\n");
1955
        return -1;
1956
    }
1957

    
1958
    s->keyframe = !get_bits1(&gb);
1959
    if (!s->theora)
1960
        skip_bits(&gb, 1);
1961
    for (i = 0; i < 3; i++)
1962
        s->last_qps[i] = s->qps[i];
1963

    
1964
    s->nqps=0;
1965
    do{
1966
        s->qps[s->nqps++]= get_bits(&gb, 6);
1967
    } while(s->theora >= 0x030200 && s->nqps<3 && get_bits1(&gb));
1968
    for (i = s->nqps; i < 3; i++)
1969
        s->qps[i] = -1;
1970

    
1971
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1972
        av_log(s->avctx, AV_LOG_INFO, " VP3 %sframe #%d: Q index = %d\n",
1973
            s->keyframe?"key":"", counter, s->qps[0]);
1974
    counter++;
1975

    
1976
    if (s->qps[0] != s->last_qps[0])
1977
        init_loop_filter(s);
1978

    
1979
    for (i = 0; i < s->nqps; i++)
1980
        // reinit all dequantizers if the first one changed, because
1981
        // the DC of the first quantizer must be used for all matrices
1982
        if (s->qps[i] != s->last_qps[i] || s->qps[0] != s->last_qps[0])
1983
            init_dequantizer(s, i);
1984

    
1985
    if (avctx->skip_frame >= AVDISCARD_NONKEY && !s->keyframe)
1986
        return buf_size;
1987

    
1988
    if (s->keyframe) {
1989
        if (!s->theora)
1990
        {
1991
            skip_bits(&gb, 4); /* width code */
1992
            skip_bits(&gb, 4); /* height code */
1993
            if (s->version)
1994
            {
1995
                s->version = get_bits(&gb, 5);
1996
                if (counter == 1)
1997
                    av_log(s->avctx, AV_LOG_DEBUG, "VP version: %d\n", s->version);
1998
            }
1999
        }
2000
        if (s->version || s->theora)
2001
        {
2002
                if (get_bits1(&gb))
2003
                    av_log(s->avctx, AV_LOG_ERROR, "Warning, unsupported keyframe coding type?!\n");
2004
            skip_bits(&gb, 2); /* reserved? */
2005
        }
2006

    
2007
        if (s->last_frame.data[0] == s->golden_frame.data[0]) {
2008
            if (s->golden_frame.data[0])
2009
                avctx->release_buffer(avctx, &s->golden_frame);
2010
            s->last_frame= s->golden_frame; /* ensure that we catch any access to this released frame */
2011
        } else {
2012
            if (s->golden_frame.data[0])
2013
                avctx->release_buffer(avctx, &s->golden_frame);
2014
            if (s->last_frame.data[0])
2015
                avctx->release_buffer(avctx, &s->last_frame);
2016
        }
2017

    
2018
        s->golden_frame.reference = 3;
2019
        if(avctx->get_buffer(avctx, &s->golden_frame) < 0) {
2020
            av_log(s->avctx, AV_LOG_ERROR, "vp3: get_buffer() failed\n");
2021
            return -1;
2022
        }
2023

    
2024
        /* golden frame is also the current frame */
2025
        s->current_frame= s->golden_frame;
2026

    
2027
        /* time to figure out pixel addresses? */
2028
        if (!s->pixel_addresses_initialized)
2029
        {
2030
            vp3_calculate_pixel_addresses(s);
2031
            s->pixel_addresses_initialized = 1;
2032
        }
2033
    } else {
2034
        /* allocate a new current frame */
2035
        s->current_frame.reference = 3;
2036
        if (!s->pixel_addresses_initialized) {
2037
            av_log(s->avctx, AV_LOG_ERROR, "vp3: first frame not a keyframe\n");
2038
            return -1;
2039
        }
2040
        if(avctx->get_buffer(avctx, &s->current_frame) < 0) {
2041
            av_log(s->avctx, AV_LOG_ERROR, "vp3: get_buffer() failed\n");
2042
            return -1;
2043
        }
2044
    }
2045

    
2046
    s->current_frame.qscale_table= s->qscale_table; //FIXME allocate individual tables per AVFrame
2047
    s->current_frame.qstride= 0;
2048

    
2049
    init_frame(s, &gb);
2050

    
2051
    if (unpack_superblocks(s, &gb)){
2052
        av_log(s->avctx, AV_LOG_ERROR, "error in unpack_superblocks\n");
2053
        return -1;
2054
    }
2055
    if (unpack_modes(s, &gb)){
2056
        av_log(s->avctx, AV_LOG_ERROR, "error in unpack_modes\n");
2057
        return -1;
2058
    }
2059
    if (unpack_vectors(s, &gb)){
2060
        av_log(s->avctx, AV_LOG_ERROR, "error in unpack_vectors\n");
2061
        return -1;
2062
    }
2063
    if (unpack_block_qpis(s, &gb)){
2064
        av_log(s->avctx, AV_LOG_ERROR, "error in unpack_block_qpis\n");
2065
        return -1;
2066
    }
2067
    if (unpack_dct_coeffs(s, &gb)){
2068
        av_log(s->avctx, AV_LOG_ERROR, "error in unpack_dct_coeffs\n");
2069
        return -1;
2070
    }
2071

    
2072
    for (i = 0; i < s->macroblock_height; i++)
2073
        render_slice(s, i);
2074

    
2075
    apply_loop_filter(s);
2076

    
2077
    *data_size=sizeof(AVFrame);
2078
    *(AVFrame*)data= s->current_frame;
2079

    
2080
    /* release the last frame, if it is allocated and if it is not the
2081
     * golden frame */
2082
    if ((s->last_frame.data[0]) &&
2083
        (s->last_frame.data[0] != s->golden_frame.data[0]))
2084
        avctx->release_buffer(avctx, &s->last_frame);
2085

    
2086
    /* shuffle frames (last = current) */
2087
    s->last_frame= s->current_frame;
2088
    s->current_frame.data[0]= NULL; /* ensure that we catch any access to this released frame */
2089

    
2090
    return buf_size;
2091
}
2092

    
2093
/*
2094
 * This is the ffmpeg/libavcodec API module cleanup function.
2095
 */
2096
static av_cold int vp3_decode_end(AVCodecContext *avctx)
2097
{
2098
    Vp3DecodeContext *s = avctx->priv_data;
2099
    int i;
2100

    
2101
    av_free(s->superblock_coding);
2102
    av_free(s->all_fragments);
2103
    av_free(s->coeff_counts);
2104
    av_free(s->coeffs);
2105
    av_free(s->coded_fragment_list);
2106
    av_free(s->fast_fragment_list);
2107
    av_free(s->superblock_fragments);
2108
    av_free(s->superblock_macroblocks);
2109
    av_free(s->macroblock_fragments);
2110
    av_free(s->macroblock_coding);
2111

    
2112
    for (i = 0; i < 16; i++) {
2113
        free_vlc(&s->dc_vlc[i]);
2114
        free_vlc(&s->ac_vlc_1[i]);
2115
        free_vlc(&s->ac_vlc_2[i]);
2116
        free_vlc(&s->ac_vlc_3[i]);
2117
        free_vlc(&s->ac_vlc_4[i]);
2118
    }
2119

    
2120
    free_vlc(&s->superblock_run_length_vlc);
2121
    free_vlc(&s->fragment_run_length_vlc);
2122
    free_vlc(&s->mode_code_vlc);
2123
    free_vlc(&s->motion_vector_vlc);
2124

    
2125
    /* release all frames */
2126
    if (s->golden_frame.data[0] && s->golden_frame.data[0] != s->last_frame.data[0])
2127
        avctx->release_buffer(avctx, &s->golden_frame);
2128
    if (s->last_frame.data[0])
2129
        avctx->release_buffer(avctx, &s->last_frame);
2130
    /* no need to release the current_frame since it will always be pointing
2131
     * to the same frame as either the golden or last frame */
2132

    
2133
    return 0;
2134
}
2135

    
2136
static int read_huffman_tree(AVCodecContext *avctx, GetBitContext *gb)
2137
{
2138
    Vp3DecodeContext *s = avctx->priv_data;
2139

    
2140
    if (get_bits1(gb)) {
2141
        int token;
2142
        if (s->entries >= 32) { /* overflow */
2143
            av_log(avctx, AV_LOG_ERROR, "huffman tree overflow\n");
2144
            return -1;
2145
        }
2146
        token = get_bits(gb, 5);
2147
        //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);
2148
        s->huffman_table[s->hti][token][0] = s->hbits;
2149
        s->huffman_table[s->hti][token][1] = s->huff_code_size;
2150
        s->entries++;
2151
    }
2152
    else {
2153
        if (s->huff_code_size >= 32) {/* overflow */
2154
            av_log(avctx, AV_LOG_ERROR, "huffman tree overflow\n");
2155
            return -1;
2156
        }
2157
        s->huff_code_size++;
2158
        s->hbits <<= 1;
2159
        if (read_huffman_tree(avctx, gb))
2160
            return -1;
2161
        s->hbits |= 1;
2162
        if (read_huffman_tree(avctx, gb))
2163
            return -1;
2164
        s->hbits >>= 1;
2165
        s->huff_code_size--;
2166
    }
2167
    return 0;
2168
}
2169

    
2170
#if CONFIG_THEORA_DECODER
2171
static int theora_decode_header(AVCodecContext *avctx, GetBitContext *gb)
2172
{
2173
    Vp3DecodeContext *s = avctx->priv_data;
2174
    int visible_width, visible_height;
2175

    
2176
    s->theora = get_bits_long(gb, 24);
2177
    av_log(avctx, AV_LOG_DEBUG, "Theora bitstream version %X\n", s->theora);
2178

    
2179
    /* 3.2.0 aka alpha3 has the same frame orientation as original vp3 */
2180
    /* but previous versions have the image flipped relative to vp3 */
2181
    if (s->theora < 0x030200)
2182
    {
2183
        s->flipped_image = 1;
2184
        av_log(avctx, AV_LOG_DEBUG, "Old (<alpha3) Theora bitstream, flipped image\n");
2185
    }
2186

    
2187
    visible_width  = s->width  = get_bits(gb, 16) << 4;
2188
    visible_height = s->height = get_bits(gb, 16) << 4;
2189

    
2190
    if(avcodec_check_dimensions(avctx, s->width, s->height)){
2191
        av_log(avctx, AV_LOG_ERROR, "Invalid dimensions (%dx%d)\n", s->width, s->height);
2192
        s->width= s->height= 0;
2193
        return -1;
2194
    }
2195

    
2196
    if (s->theora >= 0x030400)
2197
    {
2198
        skip_bits(gb, 32); /* total number of superblocks in a frame */
2199
        // fixme, the next field is 36bits long
2200
        skip_bits(gb, 32); /* total number of blocks in a frame */
2201
        skip_bits(gb, 4); /* total number of blocks in a frame */
2202
        skip_bits(gb, 32); /* total number of macroblocks in a frame */
2203
    }
2204

    
2205
    if (s->theora >= 0x030200) {
2206
        visible_width  = get_bits_long(gb, 24);
2207
        visible_height = get_bits_long(gb, 24);
2208

    
2209
        skip_bits(gb, 8); /* offset x */
2210
        skip_bits(gb, 8); /* offset y */
2211
    }
2212

    
2213
    skip_bits(gb, 32); /* fps numerator */
2214
    skip_bits(gb, 32); /* fps denumerator */
2215
    skip_bits(gb, 24); /* aspect numerator */
2216
    skip_bits(gb, 24); /* aspect denumerator */
2217

    
2218
    if (s->theora < 0x030200)
2219
        skip_bits(gb, 5); /* keyframe frequency force */
2220
    skip_bits(gb, 8); /* colorspace */
2221
    if (s->theora >= 0x030400)
2222
        skip_bits(gb, 2); /* pixel format: 420,res,422,444 */
2223
    skip_bits(gb, 24); /* bitrate */
2224

    
2225
    skip_bits(gb, 6); /* quality hint */
2226

    
2227
    if (s->theora >= 0x030200)
2228
    {
2229
        skip_bits(gb, 5); /* keyframe frequency force */
2230

    
2231
        if (s->theora < 0x030400)
2232
            skip_bits(gb, 5); /* spare bits */
2233
    }
2234

    
2235
//    align_get_bits(gb);
2236

    
2237
    if (   visible_width  <= s->width  && visible_width  > s->width-16
2238
        && visible_height <= s->height && visible_height > s->height-16)
2239
        avcodec_set_dimensions(avctx, visible_width, visible_height);
2240
    else
2241
        avcodec_set_dimensions(avctx, s->width, s->height);
2242

    
2243
    return 0;
2244
}
2245

    
2246
static int theora_decode_tables(AVCodecContext *avctx, GetBitContext *gb)
2247
{
2248
    Vp3DecodeContext *s = avctx->priv_data;
2249
    int i, n, matrices, inter, plane;
2250

    
2251
    if (s->theora >= 0x030200) {
2252
        n = get_bits(gb, 3);
2253
        /* loop filter limit values table */
2254
        for (i = 0; i < 64; i++) {
2255
            s->filter_limit_values[i] = get_bits(gb, n);
2256
            if (s->filter_limit_values[i] > 127) {
2257
                av_log(avctx, AV_LOG_ERROR, "filter limit value too large (%i > 127), clamping\n", s->filter_limit_values[i]);
2258
                s->filter_limit_values[i] = 127;
2259
            }
2260
        }
2261
    }
2262

    
2263
    if (s->theora >= 0x030200)
2264
        n = get_bits(gb, 4) + 1;
2265
    else
2266
        n = 16;
2267
    /* quality threshold table */
2268
    for (i = 0; i < 64; i++)
2269
        s->coded_ac_scale_factor[i] = get_bits(gb, n);
2270

    
2271
    if (s->theora >= 0x030200)
2272
        n = get_bits(gb, 4) + 1;
2273
    else
2274
        n = 16;
2275
    /* dc scale factor table */
2276
    for (i = 0; i < 64; i++)
2277
        s->coded_dc_scale_factor[i] = get_bits(gb, n);
2278

    
2279
    if (s->theora >= 0x030200)
2280
        matrices = get_bits(gb, 9) + 1;
2281
    else
2282
        matrices = 3;
2283

    
2284
    if(matrices > 384){
2285
        av_log(avctx, AV_LOG_ERROR, "invalid number of base matrixes\n");
2286
        return -1;
2287
    }
2288

    
2289
    for(n=0; n<matrices; n++){
2290
        for (i = 0; i < 64; i++)
2291
            s->base_matrix[n][i]= get_bits(gb, 8);
2292
    }
2293

    
2294
    for (inter = 0; inter <= 1; inter++) {
2295
        for (plane = 0; plane <= 2; plane++) {
2296
            int newqr= 1;
2297
            if (inter || plane > 0)
2298
                newqr = get_bits1(gb);
2299
            if (!newqr) {
2300
                int qtj, plj;
2301
                if(inter && get_bits1(gb)){
2302
                    qtj = 0;
2303
                    plj = plane;
2304
                }else{
2305
                    qtj= (3*inter + plane - 1) / 3;
2306
                    plj= (plane + 2) % 3;
2307
                }
2308
                s->qr_count[inter][plane]= s->qr_count[qtj][plj];
2309
                memcpy(s->qr_size[inter][plane], s->qr_size[qtj][plj], sizeof(s->qr_size[0][0]));
2310
                memcpy(s->qr_base[inter][plane], s->qr_base[qtj][plj], sizeof(s->qr_base[0][0]));
2311
            } else {
2312
                int qri= 0;
2313
                int qi = 0;
2314

    
2315
                for(;;){
2316
                    i= get_bits(gb, av_log2(matrices-1)+1);
2317
                    if(i>= matrices){
2318
                        av_log(avctx, AV_LOG_ERROR, "invalid base matrix index\n");
2319
                        return -1;
2320
                    }
2321
                    s->qr_base[inter][plane][qri]= i;
2322
                    if(qi >= 63)
2323
                        break;
2324
                    i = get_bits(gb, av_log2(63-qi)+1) + 1;
2325
                    s->qr_size[inter][plane][qri++]= i;
2326
                    qi += i;
2327
                }
2328

    
2329
                if (qi > 63) {
2330
                    av_log(avctx, AV_LOG_ERROR, "invalid qi %d > 63\n", qi);
2331
                    return -1;
2332
                }
2333
                s->qr_count[inter][plane]= qri;
2334
            }
2335
        }
2336
    }
2337

    
2338
    /* Huffman tables */
2339
    for (s->hti = 0; s->hti < 80; s->hti++) {
2340
        s->entries = 0;
2341
        s->huff_code_size = 1;
2342
        if (!get_bits1(gb)) {
2343
            s->hbits = 0;
2344
            if(read_huffman_tree(avctx, gb))
2345
                return -1;
2346
            s->hbits = 1;
2347
            if(read_huffman_tree(avctx, gb))
2348
                return -1;
2349
        }
2350
    }
2351

    
2352
    s->theora_tables = 1;
2353

    
2354
    return 0;
2355
}
2356

    
2357
static av_cold int theora_decode_init(AVCodecContext *avctx)
2358
{
2359
    Vp3DecodeContext *s = avctx->priv_data;
2360
    GetBitContext gb;
2361
    int ptype;
2362
    uint8_t *header_start[3];
2363
    int header_len[3];
2364
    int i;
2365

    
2366
    s->theora = 1;
2367

    
2368
    if (!avctx->extradata_size)
2369
    {
2370
        av_log(avctx, AV_LOG_ERROR, "Missing extradata!\n");
2371
        return -1;
2372
    }
2373

    
2374
    if (ff_split_xiph_headers(avctx->extradata, avctx->extradata_size,
2375
                              42, header_start, header_len) < 0) {
2376
        av_log(avctx, AV_LOG_ERROR, "Corrupt extradata\n");
2377
        return -1;
2378
    }
2379

    
2380
  for(i=0;i<3;i++) {
2381
    init_get_bits(&gb, header_start[i], header_len[i] * 8);
2382

    
2383
    ptype = get_bits(&gb, 8);
2384

    
2385
     if (!(ptype & 0x80))
2386
     {
2387
        av_log(avctx, AV_LOG_ERROR, "Invalid extradata!\n");
2388
//        return -1;
2389
     }
2390

    
2391
    // FIXME: Check for this as well.
2392
    skip_bits_long(&gb, 6*8); /* "theora" */
2393

    
2394
    switch(ptype)
2395
    {
2396
        case 0x80:
2397
            theora_decode_header(avctx, &gb);
2398
                break;
2399
        case 0x81:
2400
// FIXME: is this needed? it breaks sometimes
2401
//            theora_decode_comments(avctx, gb);
2402
            break;
2403
        case 0x82:
2404
            if (theora_decode_tables(avctx, &gb))
2405
                return -1;
2406
            break;
2407
        default:
2408
            av_log(avctx, AV_LOG_ERROR, "Unknown Theora config packet: %d\n", ptype&~0x80);
2409
            break;
2410
    }
2411
    if(ptype != 0x81 && 8*header_len[i] != get_bits_count(&gb))
2412
        av_log(avctx, AV_LOG_WARNING, "%d bits left in packet %X\n", 8*header_len[i] - get_bits_count(&gb), ptype);
2413
    if (s->theora < 0x030200)
2414
        break;
2415
  }
2416

    
2417
    return vp3_decode_init(avctx);
2418
}
2419

    
2420
AVCodec theora_decoder = {
2421
    "theora",
2422
    CODEC_TYPE_VIDEO,
2423
    CODEC_ID_THEORA,
2424
    sizeof(Vp3DecodeContext),
2425
    theora_decode_init,
2426
    NULL,
2427
    vp3_decode_end,
2428
    vp3_decode_frame,
2429
    CODEC_CAP_DR1,
2430
    NULL,
2431
    .long_name = NULL_IF_CONFIG_SMALL("Theora"),
2432
};
2433
#endif
2434

    
2435
AVCodec vp3_decoder = {
2436
    "vp3",
2437
    CODEC_TYPE_VIDEO,
2438
    CODEC_ID_VP3,
2439
    sizeof(Vp3DecodeContext),
2440
    vp3_decode_init,
2441
    NULL,
2442
    vp3_decode_end,
2443
    vp3_decode_frame,
2444
    CODEC_CAP_DR1,
2445
    NULL,
2446
    .long_name = NULL_IF_CONFIG_SMALL("On2 VP3"),
2447
};