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/*
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 * Duck TrueMotion 1.0 Decoder
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 * Copyright (C) 2003 Alex Beregszaszi & Mike Melanson
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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 truemotion1.c
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 * Duck TrueMotion v1 Video Decoder by
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 * Alex Beregszaszi (alex@fsn.hu) and
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 * Mike Melanson (melanson@pcisys.net)
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 *
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 * The TrueMotion v1 decoder presently only decodes 16-bit TM1 data and
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 * outputs RGB555 (or RGB565) data. 24-bit TM1 data is not supported yet.
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "common.h"
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#include "avcodec.h"
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#include "dsputil.h"
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#include "truemotion1data.h"
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typedef struct TrueMotion1Context {
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    AVCodecContext *avctx;
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    AVFrame frame;
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    AVFrame prev_frame;
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    uint8_t *buf;
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    int size;
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    uint8_t *mb_change_bits;
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    int mb_change_bits_row_size;
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    uint8_t *index_stream;
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    int index_stream_size;
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    int flags;
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    int x, y, w, h;
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    uint32_t y_predictor_table[1024];
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    uint32_t c_predictor_table[1024];
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    uint32_t fat_y_predictor_table[1024];
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    uint32_t fat_c_predictor_table[1024];
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    int compression;
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    int block_type;
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    int block_width;
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    int block_height;
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    int16_t ydt[8];
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    int16_t cdt[8];
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    int16_t fat_ydt[8];
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    int16_t fat_cdt[8];
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    int last_deltaset, last_vectable;
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    unsigned int *vert_pred;
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} TrueMotion1Context;
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#define FLAG_SPRITE         32
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#define FLAG_KEYFRAME       16
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#define FLAG_INTERFRAME      8
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#define FLAG_INTERPOLATED    4
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struct frame_header {
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    uint8_t header_size;
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    uint8_t compression;
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    uint8_t deltaset;
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    uint8_t vectable;
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    uint16_t ysize;
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    uint16_t xsize;
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    uint16_t checksum;
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    uint8_t version;
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    uint8_t header_type;
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    uint8_t flags;
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    uint8_t control;
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    uint16_t xoffset;
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    uint16_t yoffset;
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    uint16_t width;
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    uint16_t height;
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};
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#define ALGO_NOP        0
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#define ALGO_RGB16V     1
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#define ALGO_RGB16H     2
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#define ALGO_RGB24H     3
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/* these are the various block sizes that can occupy a 4x4 block */
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#define BLOCK_2x2  0
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#define BLOCK_2x4  1
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#define BLOCK_4x2  2
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#define BLOCK_4x4  3
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typedef struct comp_types {
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    int algorithm;
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    int block_width; // vres
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    int block_height; // hres
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    int block_type;
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} comp_types;
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/* { valid for metatype }, algorithm, num of deltas, vert res, horiz res */
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static comp_types compression_types[17] = {
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    { ALGO_NOP,    0, 0, 0 },
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    { ALGO_RGB16V, 4, 4, BLOCK_4x4 },
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    { ALGO_RGB16H, 4, 4, BLOCK_4x4 },
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    { ALGO_RGB16V, 4, 2, BLOCK_4x2 },
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    { ALGO_RGB16H, 4, 2, BLOCK_4x2 },
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    { ALGO_RGB16V, 2, 4, BLOCK_2x4 },
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    { ALGO_RGB16H, 2, 4, BLOCK_2x4 },
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    { ALGO_RGB16V, 2, 2, BLOCK_2x2 },
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    { ALGO_RGB16H, 2, 2, BLOCK_2x2 },
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    { ALGO_NOP,    4, 4, BLOCK_4x4 },
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    { ALGO_RGB24H, 4, 4, BLOCK_4x4 },
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    { ALGO_NOP,    4, 2, BLOCK_4x2 },
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    { ALGO_RGB24H, 4, 2, BLOCK_4x2 },
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    { ALGO_NOP,    2, 4, BLOCK_2x4 },
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    { ALGO_RGB24H, 2, 4, BLOCK_2x4 },
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    { ALGO_NOP,    2, 2, BLOCK_2x2 },
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    { ALGO_RGB24H, 2, 2, BLOCK_2x2 }
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};
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static void select_delta_tables(TrueMotion1Context *s, int delta_table_index)
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{
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    int i;
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    if (delta_table_index > 3)
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        return;
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    memcpy(s->ydt, ydts[delta_table_index], 8 * sizeof(int16_t));
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    memcpy(s->cdt, cdts[delta_table_index], 8 * sizeof(int16_t));
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    memcpy(s->fat_ydt, fat_ydts[delta_table_index], 8 * sizeof(int16_t));
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    memcpy(s->fat_cdt, fat_cdts[delta_table_index], 8 * sizeof(int16_t));
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    /* Y skinny deltas need to be halved for some reason; maybe the
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     * skinny Y deltas should be modified */
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    for (i = 0; i < 8; i++)
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    {
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        /* drop the lsb before dividing by 2-- net effect: round down
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         * when dividing a negative number (e.g., -3/2 = -2, not -1) */
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        s->ydt[i] &= 0xFFFE;
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        s->ydt[i] /= 2;
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    }
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}
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#ifdef WORDS_BIGENDIAN
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static int make_ydt15_entry(int p2, int p1, int16_t *ydt)
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#else
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static int make_ydt15_entry(int p1, int p2, int16_t *ydt)
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#endif
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{
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    int lo, hi;
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    lo = ydt[p1];
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    lo += (lo << 5) + (lo << 10);
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    hi = ydt[p2];
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    hi += (hi << 5) + (hi << 10);
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    return ((lo + (hi << 16)) << 1);
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}
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#ifdef WORDS_BIGENDIAN
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static int make_cdt15_entry(int p2, int p1, int16_t *cdt)
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#else
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static int make_cdt15_entry(int p1, int p2, int16_t *cdt)
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#endif
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{
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    int r, b, lo;
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    b = cdt[p2];
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    r = cdt[p1] << 10;
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    lo = b + r;
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    return ((lo + (lo << 16)) << 1);
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}
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#ifdef WORDS_BIGENDIAN
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static int make_ydt16_entry(int p2, int p1, int16_t *ydt)
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#else
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static int make_ydt16_entry(int p1, int p2, int16_t *ydt)
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#endif
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{
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    int lo, hi;
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    lo = ydt[p1];
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    lo += (lo << 6) + (lo << 11);
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    hi = ydt[p2];
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    hi += (hi << 6) + (hi << 11);
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    return ((lo + (hi << 16)) << 1);
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}
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#ifdef WORDS_BIGENDIAN
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static int make_cdt16_entry(int p2, int p1, int16_t *cdt)
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#else
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static int make_cdt16_entry(int p1, int p2, int16_t *cdt)
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#endif
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{
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    int r, b, lo;
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    b = cdt[p2];
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    r = cdt[p1] << 11;
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    lo = b + r;
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    return ((lo + (lo << 16)) << 1);
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}
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#ifdef WORDS_BIGENDIAN
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static int make_ydt24_entry(int p2, int p1, int16_t *ydt)
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#else
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static int make_ydt24_entry(int p1, int p2, int16_t *ydt)
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#endif
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{
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    int lo, hi;
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    lo = ydt[p1];
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    hi = ydt[p2];
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    return ((lo + (hi << 8) + (hi << 16)) << 1);
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}
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#ifdef WORDS_BIGENDIAN
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static int make_cdt24_entry(int p2, int p1, int16_t *cdt)
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#else
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static int make_cdt24_entry(int p1, int p2, int16_t *cdt)
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#endif
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{
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    int r, b;
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    b = cdt[p2];
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    r = cdt[p1]<<16;
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    return ((b+r) << 1);
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}
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static void gen_vector_table15(TrueMotion1Context *s, const uint8_t *sel_vector_table)
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{
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    int len, i, j;
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    unsigned char delta_pair;
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    for (i = 0; i < 1024; i += 4)
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    {
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        len = *sel_vector_table++ / 2;
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        for (j = 0; j < len; j++)
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        {
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            delta_pair = *sel_vector_table++;
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            s->y_predictor_table[i+j] = 0xfffffffe &
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                make_ydt15_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
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            s->c_predictor_table[i+j] = 0xfffffffe &
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                make_cdt15_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
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        }
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        s->y_predictor_table[i+(j-1)] |= 1;
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        s->c_predictor_table[i+(j-1)] |= 1;
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    }
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}
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static void gen_vector_table16(TrueMotion1Context *s, const uint8_t *sel_vector_table)
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{
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    int len, i, j;
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    unsigned char delta_pair;
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    for (i = 0; i < 1024; i += 4)
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    {
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        len = *sel_vector_table++ / 2;
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        for (j = 0; j < len; j++)
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        {
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            delta_pair = *sel_vector_table++;
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            s->y_predictor_table[i+j] = 0xfffffffe &
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                make_ydt16_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
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            s->c_predictor_table[i+j] = 0xfffffffe &
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                make_cdt16_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
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        }
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        s->y_predictor_table[i+(j-1)] |= 1;
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        s->c_predictor_table[i+(j-1)] |= 1;
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    }
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}
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static void gen_vector_table24(TrueMotion1Context *s, const uint8_t *sel_vector_table)
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{
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    int len, i, j;
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    unsigned char delta_pair;
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    for (i = 0; i < 1024; i += 4)
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    {
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        len = *sel_vector_table++ / 2;
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        for (j = 0; j < len; j++)
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        {
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            delta_pair = *sel_vector_table++;
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            s->y_predictor_table[i+j] = 0xfffffffe &
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                make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
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            s->c_predictor_table[i+j] = 0xfffffffe &
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                make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
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            s->fat_y_predictor_table[i+j] = 0xfffffffe &
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                make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_ydt);
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            s->fat_c_predictor_table[i+j] = 0xfffffffe &
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                make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_cdt);
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        }
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        s->y_predictor_table[i+(j-1)] |= 1;
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        s->c_predictor_table[i+(j-1)] |= 1;
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        s->fat_y_predictor_table[i+(j-1)] |= 1;
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        s->fat_c_predictor_table[i+(j-1)] |= 1;
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    }
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}
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/* Returns the number of bytes consumed from the bytestream. Returns -1 if
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 * there was an error while decoding the header */
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static int truemotion1_decode_header(TrueMotion1Context *s)
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{
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    int i;
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    struct frame_header header;
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    uint8_t header_buffer[128];  /* logical maximum size of the header */
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    const uint8_t *sel_vector_table;
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    /* There is 1 change bit per 4 pixels, so each change byte represents
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     * 32 pixels; divide width by 4 to obtain the number of change bits and
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     * then round up to the nearest byte. */
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    s->mb_change_bits_row_size = ((s->avctx->width >> 2) + 7) >> 3;
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    header.header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f;
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    if (s->buf[0] < 0x10)
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    {
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        av_log(s->avctx, AV_LOG_ERROR, "invalid header size (%d)\n", s->buf[0]);
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        return -1;
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    }
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    /* unscramble the header bytes with a XOR operation */
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    memset(header_buffer, 0, 128);
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    for (i = 1; i < header.header_size; i++)
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        header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1];
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    header.compression = header_buffer[0];
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    header.deltaset = header_buffer[1];
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    header.vectable = header_buffer[2];
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    header.ysize = AV_RL16(&header_buffer[3]);
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    header.xsize = AV_RL16(&header_buffer[5]);
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    header.checksum = AV_RL16(&header_buffer[7]);
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    header.version = header_buffer[9];
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    header.header_type = header_buffer[10];
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    header.flags = header_buffer[11];
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    header.control = header_buffer[12];
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    /* Version 2 */
360
    if (header.version >= 2)
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    {
362
        if (header.header_type > 3)
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        {
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            av_log(s->avctx, AV_LOG_ERROR, "invalid header type (%d)\n", header.header_type);
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            return -1;
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        } else if ((header.header_type == 2) || (header.header_type == 3)) {
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            s->flags = header.flags;
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            if (!(s->flags & FLAG_INTERFRAME))
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                s->flags |= FLAG_KEYFRAME;
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        } else
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            s->flags = FLAG_KEYFRAME;
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    } else /* Version 1 */
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        s->flags = FLAG_KEYFRAME;
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    if (s->flags & FLAG_SPRITE) {
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        av_log(s->avctx, AV_LOG_INFO, "SPRITE frame found, please report the sample to the developers\n");
377 8274e422 Sascha Sommer
        /* FIXME header.width, height, xoffset and yoffset aren't initialized */
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#if 0
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        s->w = header.width;
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        s->h = header.height;
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        s->x = header.xoffset;
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        s->y = header.yoffset;
383 8274e422 Sascha Sommer
#else
384
        return -1;
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#endif
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    } else {
387
        s->w = header.xsize;
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        s->h = header.ysize;
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        if (header.header_type < 2) {
390
            if ((s->w < 213) && (s->h >= 176))
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            {
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                s->flags |= FLAG_INTERPOLATED;
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                av_log(s->avctx, AV_LOG_INFO, "INTERPOLATION selected, please report the sample to the developers\n");
394
            }
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        }
396
    }
397
398
    if (header.compression > 17) {
399 fd146758 Alex Beregszaszi
        av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression);
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        return -1;
401
    }
402 115329f1 Diego Biurrun
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    if ((header.deltaset != s->last_deltaset) ||
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        (header.vectable != s->last_vectable))
405
        select_delta_tables(s, header.deltaset);
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    if ((header.compression & 1) && header.header_type)
408
        sel_vector_table = pc_tbl2;
409
    else {
410
        if (header.vectable < 4)
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            sel_vector_table = tables[header.vectable - 1];
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        else {
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            av_log(s->avctx, AV_LOG_ERROR, "invalid vector table id (%d)\n", header.vectable);
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            return -1;
415
        }
416
    }
417 115329f1 Diego Biurrun
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    // FIXME: where to place this ?!?!
419
    if (compression_types[header.compression].algorithm == ALGO_RGB24H)
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        s->avctx->pix_fmt = PIX_FMT_RGB32;
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    else
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        s->avctx->pix_fmt = PIX_FMT_RGB555; // RGB565 is supported aswell
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    if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable))
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    {
426
        if (compression_types[header.compression].algorithm == ALGO_RGB24H)
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            gen_vector_table24(s, sel_vector_table);
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        else
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        if (s->avctx->pix_fmt == PIX_FMT_RGB555)
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            gen_vector_table15(s, sel_vector_table);
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        else
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            gen_vector_table16(s, sel_vector_table);
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    }
434
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    /* set up pointers to the other key data chunks */
436
    s->mb_change_bits = s->buf + header.header_size;
437
    if (s->flags & FLAG_KEYFRAME) {
438
        /* no change bits specified for a keyframe; only index bytes */
439
        s->index_stream = s->mb_change_bits;
440
    } else {
441
        /* one change bit per 4x4 block */
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        s->index_stream = s->mb_change_bits +
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            (s->mb_change_bits_row_size * (s->avctx->height >> 2));
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    }
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    s->index_stream_size = s->size - (s->index_stream - s->buf);
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    s->last_deltaset = header.deltaset;
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    s->last_vectable = header.vectable;
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    s->compression = header.compression;
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    s->block_width = compression_types[header.compression].block_width;
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    s->block_height = compression_types[header.compression].block_height;
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    s->block_type = compression_types[header.compression].block_type;
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    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
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        av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n",
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            s->last_deltaset, s->last_vectable, s->compression, s->block_width,
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            s->block_height, s->block_type,
458
            s->flags & FLAG_KEYFRAME ? " KEY" : "",
459
            s->flags & FLAG_INTERFRAME ? " INTER" : "",
460
            s->flags & FLAG_SPRITE ? " SPRITE" : "",
461
            s->flags & FLAG_INTERPOLATED ? " INTERPOL" : "");
462 be441a9e Alex Beregszaszi
463 115329f1 Diego Biurrun
    return header.header_size;
464 9a4117d5 Mike Melanson
}
465
466
static int truemotion1_decode_init(AVCodecContext *avctx)
467
{
468
    TrueMotion1Context *s = (TrueMotion1Context *)avctx->priv_data;
469
470
    s->avctx = avctx;
471
472 be441a9e Alex Beregszaszi
    // FIXME: it may change ?
473
//    if (avctx->bits_per_sample == 24)
474 bb270c08 Diego Biurrun
//        avctx->pix_fmt = PIX_FMT_RGB24;
475 be441a9e Alex Beregszaszi
//    else
476 bb270c08 Diego Biurrun
//        avctx->pix_fmt = PIX_FMT_RGB555;
477 be441a9e Alex Beregszaszi
478 9a4117d5 Mike Melanson
    avctx->has_b_frames = 0;
479
    s->frame.data[0] = s->prev_frame.data[0] = NULL;
480
481
    /* there is a vertical predictor for each pixel in a line; each vertical
482
     * predictor is 0 to start with */
483 115329f1 Diego Biurrun
    s->vert_pred =
484 4b7e4bed Mike Melanson
        (unsigned int *)av_malloc(s->avctx->width * sizeof(unsigned int));
485 9a4117d5 Mike Melanson
486
    return 0;
487
}
488
489 be441a9e Alex Beregszaszi
/*
490
Block decoding order:
491

492
dxi: Y-Y
493
dxic: Y-C-Y
494
dxic2: Y-C-Y-C
495

496
hres,vres,i,i%vres (0 < i < 4)
497
2x2 0: 0 dxic2
498
2x2 1: 1 dxi
499
2x2 2: 0 dxic2
500
2x2 3: 1 dxi
501
2x4 0: 0 dxic2
502
2x4 1: 1 dxi
503
2x4 2: 2 dxi
504
2x4 3: 3 dxi
505
4x2 0: 0 dxic
506
4x2 1: 1 dxi
507
4x2 2: 0 dxic
508
4x2 3: 1 dxi
509
4x4 0: 0 dxic
510
4x4 1: 1 dxi
511
4x4 2: 2 dxi
512
4x4 3: 3 dxi
513
*/
514
515 9a4117d5 Mike Melanson
#define GET_NEXT_INDEX() \
516
{\
517
    if (index_stream_index >= s->index_stream_size) { \
518 fd146758 Alex Beregszaszi
        av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \
519 9a4117d5 Mike Melanson
        return; \
520
    } \
521
    index = s->index_stream[index_stream_index++] * 4; \
522
}
523
524
#define APPLY_C_PREDICTOR() \
525
    predictor_pair = s->c_predictor_table[index]; \
526
    horiz_pred += (predictor_pair >> 1); \
527
    if (predictor_pair & 1) { \
528
        GET_NEXT_INDEX() \
529
        if (!index) { \
530
            GET_NEXT_INDEX() \
531
            predictor_pair = s->c_predictor_table[index]; \
532
            horiz_pred += ((predictor_pair >> 1) * 5); \
533
            if (predictor_pair & 1) \
534
                GET_NEXT_INDEX() \
535
            else \
536
                index++; \
537
        } \
538
    } else \
539
        index++;
540
541 be441a9e Alex Beregszaszi
#define APPLY_C_PREDICTOR_24() \
542
    predictor_pair = s->c_predictor_table[index]; \
543 4b7e4bed Mike Melanson
    horiz_pred += (predictor_pair >> 1); \
544 be441a9e Alex Beregszaszi
    if (predictor_pair & 1) { \
545
        GET_NEXT_INDEX() \
546
        if (!index) { \
547
            GET_NEXT_INDEX() \
548
            predictor_pair = s->fat_c_predictor_table[index]; \
549 4b7e4bed Mike Melanson
            horiz_pred += (predictor_pair >> 1); \
550 be441a9e Alex Beregszaszi
            if (predictor_pair & 1) \
551
                GET_NEXT_INDEX() \
552
            else \
553
                index++; \
554
        } \
555
    } else \
556 115329f1 Diego Biurrun
        index++;
557 be441a9e Alex Beregszaszi
558
559 9a4117d5 Mike Melanson
#define APPLY_Y_PREDICTOR() \
560
    predictor_pair = s->y_predictor_table[index]; \
561
    horiz_pred += (predictor_pair >> 1); \
562
    if (predictor_pair & 1) { \
563
        GET_NEXT_INDEX() \
564
        if (!index) { \
565
            GET_NEXT_INDEX() \
566
            predictor_pair = s->y_predictor_table[index]; \
567
            horiz_pred += ((predictor_pair >> 1) * 5); \
568
            if (predictor_pair & 1) \
569
                GET_NEXT_INDEX() \
570
            else \
571
                index++; \
572
        } \
573
    } else \
574
        index++;
575
576 be441a9e Alex Beregszaszi
#define APPLY_Y_PREDICTOR_24() \
577
    predictor_pair = s->y_predictor_table[index]; \
578
    horiz_pred += (predictor_pair >> 1); \
579
    if (predictor_pair & 1) { \
580
        GET_NEXT_INDEX() \
581
        if (!index) { \
582
            GET_NEXT_INDEX() \
583
            predictor_pair = s->fat_y_predictor_table[index]; \
584
            horiz_pred += (predictor_pair >> 1); \
585
            if (predictor_pair & 1) \
586
                GET_NEXT_INDEX() \
587
            else \
588
                index++; \
589
        } \
590
    } else \
591
        index++;
592
593 9a4117d5 Mike Melanson
#define OUTPUT_PIXEL_PAIR() \
594
    *current_pixel_pair = *vert_pred + horiz_pred; \
595
    *vert_pred++ = *current_pixel_pair++; \
596
    prev_pixel_pair++;
597
598
static void truemotion1_decode_16bit(TrueMotion1Context *s)
599
{
600
    int y;
601
    int pixels_left;  /* remaining pixels on this line */
602
    unsigned int predictor_pair;
603
    unsigned int horiz_pred;
604
    unsigned int *vert_pred;
605
    unsigned int *current_pixel_pair;
606
    unsigned int *prev_pixel_pair;
607
    unsigned char *current_line = s->frame.data[0];
608
    unsigned char *prev_line = s->prev_frame.data[0];
609
    int keyframe = s->flags & FLAG_KEYFRAME;
610
611
    /* these variables are for managing the stream of macroblock change bits */
612
    unsigned char *mb_change_bits = s->mb_change_bits;
613
    unsigned char mb_change_byte;
614
    unsigned char mb_change_byte_mask;
615
    int mb_change_index;
616
617
    /* these variables are for managing the main index stream */
618
    int index_stream_index = 0;  /* yes, the index into the index stream */
619
    int index;
620
621
    /* clean out the line buffer */
622 4b7e4bed Mike Melanson
    memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
623 9a4117d5 Mike Melanson
624
    GET_NEXT_INDEX();
625
626
    for (y = 0; y < s->avctx->height; y++) {
627
628
        /* re-init variables for the next line iteration */
629
        horiz_pred = 0;
630
        current_pixel_pair = (unsigned int *)current_line;
631
        prev_pixel_pair = (unsigned int *)prev_line;
632
        vert_pred = s->vert_pred;
633
        mb_change_index = 0;
634
        mb_change_byte = mb_change_bits[mb_change_index++];
635
        mb_change_byte_mask = 0x01;
636
        pixels_left = s->avctx->width;
637
638
        while (pixels_left > 0) {
639
640
            if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
641
642
                switch (y & 3) {
643
                case 0:
644 115329f1 Diego Biurrun
                    /* if macroblock width is 2, apply C-Y-C-Y; else
645 9a4117d5 Mike Melanson
                     * apply C-Y-Y */
646 6952f123 Mike Melanson
                    if (s->block_width == 2) {
647 9a4117d5 Mike Melanson
                        APPLY_C_PREDICTOR();
648
                        APPLY_Y_PREDICTOR();
649
                        OUTPUT_PIXEL_PAIR();
650
                        APPLY_C_PREDICTOR();
651
                        APPLY_Y_PREDICTOR();
652
                        OUTPUT_PIXEL_PAIR();
653
                    } else {
654
                        APPLY_C_PREDICTOR();
655
                        APPLY_Y_PREDICTOR();
656
                        OUTPUT_PIXEL_PAIR();
657
                        APPLY_Y_PREDICTOR();
658
                        OUTPUT_PIXEL_PAIR();
659
                    }
660
                    break;
661
662
                case 1:
663
                case 3:
664
                    /* always apply 2 Y predictors on these iterations */
665
                    APPLY_Y_PREDICTOR();
666
                    OUTPUT_PIXEL_PAIR();
667
                    APPLY_Y_PREDICTOR();
668
                    OUTPUT_PIXEL_PAIR();
669
                    break;
670
671
                case 2:
672 115329f1 Diego Biurrun
                    /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
673 9a4117d5 Mike Melanson
                     * depending on the macroblock type */
674
                    if (s->block_type == BLOCK_2x2) {
675
                        APPLY_C_PREDICTOR();
676
                        APPLY_Y_PREDICTOR();
677
                        OUTPUT_PIXEL_PAIR();
678
                        APPLY_C_PREDICTOR();
679
                        APPLY_Y_PREDICTOR();
680
                        OUTPUT_PIXEL_PAIR();
681
                    } else if (s->block_type == BLOCK_4x2) {
682
                        APPLY_C_PREDICTOR();
683
                        APPLY_Y_PREDICTOR();
684
                        OUTPUT_PIXEL_PAIR();
685
                        APPLY_Y_PREDICTOR();
686
                        OUTPUT_PIXEL_PAIR();
687
                    } else {
688
                        APPLY_Y_PREDICTOR();
689
                        OUTPUT_PIXEL_PAIR();
690
                        APPLY_Y_PREDICTOR();
691
                        OUTPUT_PIXEL_PAIR();
692
                    }
693
                    break;
694
                }
695
696
            } else {
697
698 115329f1 Diego Biurrun
                /* skip (copy) four pixels, but reassign the horizontal
699 9a4117d5 Mike Melanson
                 * predictor */
700
                *current_pixel_pair = *prev_pixel_pair++;
701
                *vert_pred++ = *current_pixel_pair++;
702
                *current_pixel_pair = *prev_pixel_pair++;
703
                horiz_pred = *current_pixel_pair - *vert_pred;
704
                *vert_pred++ = *current_pixel_pair++;
705 115329f1 Diego Biurrun
706 9a4117d5 Mike Melanson
            }
707
708
            if (!keyframe) {
709
                mb_change_byte_mask <<= 1;
710
711
                /* next byte */
712
                if (!mb_change_byte_mask) {
713
                    mb_change_byte = mb_change_bits[mb_change_index++];
714
                    mb_change_byte_mask = 0x01;
715
                }
716
            }
717
718
            pixels_left -= 4;
719
        }
720
721
        /* next change row */
722
        if (((y + 1) & 3) == 0)
723
            mb_change_bits += s->mb_change_bits_row_size;
724
725
        current_line += s->frame.linesize[0];
726
        prev_line += s->prev_frame.linesize[0];
727
    }
728
}
729
730 be441a9e Alex Beregszaszi
static void truemotion1_decode_24bit(TrueMotion1Context *s)
731
{
732
    int y;
733
    int pixels_left;  /* remaining pixels on this line */
734
    unsigned int predictor_pair;
735
    unsigned int horiz_pred;
736
    unsigned int *vert_pred;
737
    unsigned int *current_pixel_pair;
738
    unsigned int *prev_pixel_pair;
739
    unsigned char *current_line = s->frame.data[0];
740
    unsigned char *prev_line = s->prev_frame.data[0];
741
    int keyframe = s->flags & FLAG_KEYFRAME;
742
743
    /* these variables are for managing the stream of macroblock change bits */
744
    unsigned char *mb_change_bits = s->mb_change_bits;
745
    unsigned char mb_change_byte;
746
    unsigned char mb_change_byte_mask;
747
    int mb_change_index;
748
749
    /* these variables are for managing the main index stream */
750
    int index_stream_index = 0;  /* yes, the index into the index stream */
751
    int index;
752
753
    /* clean out the line buffer */
754 a0ed075b Reimar Döffinger
    memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
755 be441a9e Alex Beregszaszi
756
    GET_NEXT_INDEX();
757
758
    for (y = 0; y < s->avctx->height; y++) {
759
760
        /* re-init variables for the next line iteration */
761 4b7e4bed Mike Melanson
        horiz_pred = 0;
762 be441a9e Alex Beregszaszi
        current_pixel_pair = (unsigned int *)current_line;
763
        prev_pixel_pair = (unsigned int *)prev_line;
764
        vert_pred = s->vert_pred;
765
        mb_change_index = 0;
766
        mb_change_byte = mb_change_bits[mb_change_index++];
767
        mb_change_byte_mask = 0x01;
768
        pixels_left = s->avctx->width;
769
770
        while (pixels_left > 0) {
771
772
            if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
773
774
                switch (y & 3) {
775
                case 0:
776 115329f1 Diego Biurrun
                    /* if macroblock width is 2, apply C-Y-C-Y; else
777 be441a9e Alex Beregszaszi
                     * apply C-Y-Y */
778
                    if (s->block_width == 2) {
779
                        APPLY_C_PREDICTOR_24();
780
                        APPLY_Y_PREDICTOR_24();
781
                        OUTPUT_PIXEL_PAIR();
782
                        APPLY_C_PREDICTOR_24();
783
                        APPLY_Y_PREDICTOR_24();
784
                        OUTPUT_PIXEL_PAIR();
785
                    } else {
786
                        APPLY_C_PREDICTOR_24();
787
                        APPLY_Y_PREDICTOR_24();
788
                        OUTPUT_PIXEL_PAIR();
789
                        APPLY_Y_PREDICTOR_24();
790
                        OUTPUT_PIXEL_PAIR();
791
                    }
792
                    break;
793
794
                case 1:
795
                case 3:
796
                    /* always apply 2 Y predictors on these iterations */
797
                    APPLY_Y_PREDICTOR_24();
798
                    OUTPUT_PIXEL_PAIR();
799
                    APPLY_Y_PREDICTOR_24();
800
                    OUTPUT_PIXEL_PAIR();
801
                    break;
802
803
                case 2:
804 115329f1 Diego Biurrun
                    /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
805 be441a9e Alex Beregszaszi
                     * depending on the macroblock type */
806
                    if (s->block_type == BLOCK_2x2) {
807
                        APPLY_C_PREDICTOR_24();
808
                        APPLY_Y_PREDICTOR_24();
809
                        OUTPUT_PIXEL_PAIR();
810
                        APPLY_C_PREDICTOR_24();
811
                        APPLY_Y_PREDICTOR_24();
812
                        OUTPUT_PIXEL_PAIR();
813
                    } else if (s->block_type == BLOCK_4x2) {
814
                        APPLY_C_PREDICTOR_24();
815
                        APPLY_Y_PREDICTOR_24();
816
                        OUTPUT_PIXEL_PAIR();
817
                        APPLY_Y_PREDICTOR_24();
818
                        OUTPUT_PIXEL_PAIR();
819
                    } else {
820
                        APPLY_Y_PREDICTOR_24();
821
                        OUTPUT_PIXEL_PAIR();
822
                        APPLY_Y_PREDICTOR_24();
823
                        OUTPUT_PIXEL_PAIR();
824
                    }
825
                    break;
826
                }
827
828
            } else {
829
830 115329f1 Diego Biurrun
                /* skip (copy) four pixels, but reassign the horizontal
831 be441a9e Alex Beregszaszi
                 * predictor */
832
                *current_pixel_pair = *prev_pixel_pair++;
833
                *vert_pred++ = *current_pixel_pair++;
834
                *current_pixel_pair = *prev_pixel_pair++;
835
                horiz_pred = *current_pixel_pair - *vert_pred;
836
                *vert_pred++ = *current_pixel_pair++;
837 115329f1 Diego Biurrun
838 be441a9e Alex Beregszaszi
            }
839
840
            if (!keyframe) {
841
                mb_change_byte_mask <<= 1;
842
843
                /* next byte */
844
                if (!mb_change_byte_mask) {
845
                    mb_change_byte = mb_change_bits[mb_change_index++];
846
                    mb_change_byte_mask = 0x01;
847
                }
848
            }
849
850
            pixels_left -= 4;
851
        }
852
853
        /* next change row */
854
        if (((y + 1) & 3) == 0)
855
            mb_change_bits += s->mb_change_bits_row_size;
856
857
        current_line += s->frame.linesize[0];
858
        prev_line += s->prev_frame.linesize[0];
859
    }
860
}
861
862
863 9a4117d5 Mike Melanson
static int truemotion1_decode_frame(AVCodecContext *avctx,
864
                                    void *data, int *data_size,
865
                                    uint8_t *buf, int buf_size)
866
{
867
    TrueMotion1Context *s = (TrueMotion1Context *)avctx->priv_data;
868
869
    s->buf = buf;
870
    s->size = buf_size;
871
872
    if (truemotion1_decode_header(s) == -1)
873
        return -1;
874
875 be441a9e Alex Beregszaszi
    s->frame.reference = 1;
876
    if (avctx->get_buffer(avctx, &s->frame) < 0) {
877
        av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
878
        return -1;
879
    }
880
881 9a4117d5 Mike Melanson
    /* check for a do-nothing frame and copy the previous frame */
882
    if (compression_types[s->compression].algorithm == ALGO_NOP)
883
    {
884
        memcpy(s->frame.data[0], s->prev_frame.data[0],
885
            s->frame.linesize[0] * s->avctx->height);
886
    } else if (compression_types[s->compression].algorithm == ALGO_RGB24H) {
887 be441a9e Alex Beregszaszi
        truemotion1_decode_24bit(s);
888 9a4117d5 Mike Melanson
    } else {
889
        truemotion1_decode_16bit(s);
890
    }
891
892
    if (s->prev_frame.data[0])
893
        avctx->release_buffer(avctx, &s->prev_frame);
894
895
    /* shuffle frames */
896
    s->prev_frame = s->frame;
897
898
    *data_size = sizeof(AVFrame);
899
    *(AVFrame*)data = s->frame;
900
901
    /* report that the buffer was completely consumed */
902
    return buf_size;
903
}
904
905
static int truemotion1_decode_end(AVCodecContext *avctx)
906
{
907
    TrueMotion1Context *s = (TrueMotion1Context *)avctx->priv_data;
908
909
    /* release the last frame */
910
    if (s->prev_frame.data[0])
911
        avctx->release_buffer(avctx, &s->prev_frame);
912
913
    av_free(s->vert_pred);
914
915
    return 0;
916
}
917
918
AVCodec truemotion1_decoder = {
919
    "truemotion1",
920
    CODEC_TYPE_VIDEO,
921
    CODEC_ID_TRUEMOTION1,
922
    sizeof(TrueMotion1Context),
923
    truemotion1_decode_init,
924
    NULL,
925
    truemotion1_decode_end,
926
    truemotion1_decode_frame,
927
    CODEC_CAP_DR1,
928
};