yading@10: /*
yading@10:  * Duck TrueMotion 1.0 Decoder
yading@10:  * Copyright (C) 2003 Alex Beregszaszi & Mike Melanson
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * Duck TrueMotion v1 Video Decoder by
yading@10:  * Alex Beregszaszi and
yading@10:  * Mike Melanson (melanson@pcisys.net)
yading@10:  *
yading@10:  * The TrueMotion v1 decoder presently only decodes 16-bit TM1 data and
yading@10:  * outputs RGB555 (or RGB565) data. 24-bit TM1 data is not supported yet.
yading@10:  */
yading@10: 
yading@10: #include <stdio.h>
yading@10: #include <stdlib.h>
yading@10: #include <string.h>
yading@10: 
yading@10: #include "avcodec.h"
yading@10: #include "internal.h"
yading@10: #include "libavutil/imgutils.h"
yading@10: #include "libavutil/internal.h"
yading@10: #include "libavutil/intreadwrite.h"
yading@10: #include "libavutil/mem.h"
yading@10: 
yading@10: #include "truemotion1data.h"
yading@10: 
yading@10: typedef struct TrueMotion1Context {
yading@10:     AVCodecContext *avctx;
yading@10:     AVFrame frame;
yading@10: 
yading@10:     const uint8_t *buf;
yading@10:     int size;
yading@10: 
yading@10:     const uint8_t *mb_change_bits;
yading@10:     int mb_change_bits_row_size;
yading@10:     const uint8_t *index_stream;
yading@10:     int index_stream_size;
yading@10: 
yading@10:     int flags;
yading@10:     int x, y, w, h;
yading@10: 
yading@10:     uint32_t y_predictor_table[1024];
yading@10:     uint32_t c_predictor_table[1024];
yading@10:     uint32_t fat_y_predictor_table[1024];
yading@10:     uint32_t fat_c_predictor_table[1024];
yading@10: 
yading@10:     int compression;
yading@10:     int block_type;
yading@10:     int block_width;
yading@10:     int block_height;
yading@10: 
yading@10:     int16_t ydt[8];
yading@10:     int16_t cdt[8];
yading@10:     int16_t fat_ydt[8];
yading@10:     int16_t fat_cdt[8];
yading@10: 
yading@10:     int last_deltaset, last_vectable;
yading@10: 
yading@10:     unsigned int *vert_pred;
yading@10:     int vert_pred_size;
yading@10: 
yading@10: } TrueMotion1Context;
yading@10: 
yading@10: #define FLAG_SPRITE         32
yading@10: #define FLAG_KEYFRAME       16
yading@10: #define FLAG_INTERFRAME      8
yading@10: #define FLAG_INTERPOLATED    4
yading@10: 
yading@10: struct frame_header {
yading@10:     uint8_t header_size;
yading@10:     uint8_t compression;
yading@10:     uint8_t deltaset;
yading@10:     uint8_t vectable;
yading@10:     uint16_t ysize;
yading@10:     uint16_t xsize;
yading@10:     uint16_t checksum;
yading@10:     uint8_t version;
yading@10:     uint8_t header_type;
yading@10:     uint8_t flags;
yading@10:     uint8_t control;
yading@10:     uint16_t xoffset;
yading@10:     uint16_t yoffset;
yading@10:     uint16_t width;
yading@10:     uint16_t height;
yading@10: };
yading@10: 
yading@10: #define ALGO_NOP        0
yading@10: #define ALGO_RGB16V     1
yading@10: #define ALGO_RGB16H     2
yading@10: #define ALGO_RGB24H     3
yading@10: 
yading@10: /* these are the various block sizes that can occupy a 4x4 block */
yading@10: #define BLOCK_2x2  0
yading@10: #define BLOCK_2x4  1
yading@10: #define BLOCK_4x2  2
yading@10: #define BLOCK_4x4  3
yading@10: 
yading@10: typedef struct comp_types {
yading@10:     int algorithm;
yading@10:     int block_width; // vres
yading@10:     int block_height; // hres
yading@10:     int block_type;
yading@10: } comp_types;
yading@10: 
yading@10: /* { valid for metatype }, algorithm, num of deltas, vert res, horiz res */
yading@10: static const comp_types compression_types[17] = {
yading@10:     { ALGO_NOP,    0, 0, 0 },
yading@10: 
yading@10:     { ALGO_RGB16V, 4, 4, BLOCK_4x4 },
yading@10:     { ALGO_RGB16H, 4, 4, BLOCK_4x4 },
yading@10:     { ALGO_RGB16V, 4, 2, BLOCK_4x2 },
yading@10:     { ALGO_RGB16H, 4, 2, BLOCK_4x2 },
yading@10: 
yading@10:     { ALGO_RGB16V, 2, 4, BLOCK_2x4 },
yading@10:     { ALGO_RGB16H, 2, 4, BLOCK_2x4 },
yading@10:     { ALGO_RGB16V, 2, 2, BLOCK_2x2 },
yading@10:     { ALGO_RGB16H, 2, 2, BLOCK_2x2 },
yading@10: 
yading@10:     { ALGO_NOP,    4, 4, BLOCK_4x4 },
yading@10:     { ALGO_RGB24H, 4, 4, BLOCK_4x4 },
yading@10:     { ALGO_NOP,    4, 2, BLOCK_4x2 },
yading@10:     { ALGO_RGB24H, 4, 2, BLOCK_4x2 },
yading@10: 
yading@10:     { ALGO_NOP,    2, 4, BLOCK_2x4 },
yading@10:     { ALGO_RGB24H, 2, 4, BLOCK_2x4 },
yading@10:     { ALGO_NOP,    2, 2, BLOCK_2x2 },
yading@10:     { ALGO_RGB24H, 2, 2, BLOCK_2x2 }
yading@10: };
yading@10: 
yading@10: static void select_delta_tables(TrueMotion1Context *s, int delta_table_index)
yading@10: {
yading@10:     int i;
yading@10: 
yading@10:     if (delta_table_index > 3)
yading@10:         return;
yading@10: 
yading@10:     memcpy(s->ydt, ydts[delta_table_index], 8 * sizeof(int16_t));
yading@10:     memcpy(s->cdt, cdts[delta_table_index], 8 * sizeof(int16_t));
yading@10:     memcpy(s->fat_ydt, fat_ydts[delta_table_index], 8 * sizeof(int16_t));
yading@10:     memcpy(s->fat_cdt, fat_cdts[delta_table_index], 8 * sizeof(int16_t));
yading@10: 
yading@10:     /* Y skinny deltas need to be halved for some reason; maybe the
yading@10:      * skinny Y deltas should be modified */
yading@10:     for (i = 0; i < 8; i++)
yading@10:     {
yading@10:         /* drop the lsb before dividing by 2-- net effect: round down
yading@10:          * when dividing a negative number (e.g., -3/2 = -2, not -1) */
yading@10:         s->ydt[i] &= 0xFFFE;
yading@10:         s->ydt[i] /= 2;
yading@10:     }
yading@10: }
yading@10: 
yading@10: #if HAVE_BIGENDIAN
yading@10: static int make_ydt15_entry(int p2, int p1, int16_t *ydt)
yading@10: #else
yading@10: static int make_ydt15_entry(int p1, int p2, int16_t *ydt)
yading@10: #endif
yading@10: {
yading@10:     int lo, hi;
yading@10: 
yading@10:     lo = ydt[p1];
yading@10:     lo += (lo << 5) + (lo << 10);
yading@10:     hi = ydt[p2];
yading@10:     hi += (hi << 5) + (hi << 10);
yading@10:     return (lo + (hi << 16)) << 1;
yading@10: }
yading@10: 
yading@10: static int make_cdt15_entry(int p1, int p2, int16_t *cdt)
yading@10: {
yading@10:     int r, b, lo;
yading@10: 
yading@10:     b = cdt[p2];
yading@10:     r = cdt[p1] << 10;
yading@10:     lo = b + r;
yading@10:     return (lo + (lo << 16)) << 1;
yading@10: }
yading@10: 
yading@10: #if HAVE_BIGENDIAN
yading@10: static int make_ydt16_entry(int p2, int p1, int16_t *ydt)
yading@10: #else
yading@10: static int make_ydt16_entry(int p1, int p2, int16_t *ydt)
yading@10: #endif
yading@10: {
yading@10:     int lo, hi;
yading@10: 
yading@10:     lo = ydt[p1];
yading@10:     lo += (lo << 6) + (lo << 11);
yading@10:     hi = ydt[p2];
yading@10:     hi += (hi << 6) + (hi << 11);
yading@10:     return (lo + (hi << 16)) << 1;
yading@10: }
yading@10: 
yading@10: static int make_cdt16_entry(int p1, int p2, int16_t *cdt)
yading@10: {
yading@10:     int r, b, lo;
yading@10: 
yading@10:     b = cdt[p2];
yading@10:     r = cdt[p1] << 11;
yading@10:     lo = b + r;
yading@10:     return (lo + (lo << 16)) << 1;
yading@10: }
yading@10: 
yading@10: static int make_ydt24_entry(int p1, int p2, int16_t *ydt)
yading@10: {
yading@10:     int lo, hi;
yading@10: 
yading@10:     lo = ydt[p1];
yading@10:     hi = ydt[p2];
yading@10:     return (lo + (hi << 8) + (hi << 16)) << 1;
yading@10: }
yading@10: 
yading@10: static int make_cdt24_entry(int p1, int p2, int16_t *cdt)
yading@10: {
yading@10:     int r, b;
yading@10: 
yading@10:     b = cdt[p2];
yading@10:     r = cdt[p1]<<16;
yading@10:     return (b+r) << 1;
yading@10: }
yading@10: 
yading@10: static void gen_vector_table15(TrueMotion1Context *s, const uint8_t *sel_vector_table)
yading@10: {
yading@10:     int len, i, j;
yading@10:     unsigned char delta_pair;
yading@10: 
yading@10:     for (i = 0; i < 1024; i += 4)
yading@10:     {
yading@10:         len = *sel_vector_table++ / 2;
yading@10:         for (j = 0; j < len; j++)
yading@10:         {
yading@10:             delta_pair = *sel_vector_table++;
yading@10:             s->y_predictor_table[i+j] = 0xfffffffe &
yading@10:                 make_ydt15_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
yading@10:             s->c_predictor_table[i+j] = 0xfffffffe &
yading@10:                 make_cdt15_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
yading@10:         }
yading@10:         s->y_predictor_table[i+(j-1)] |= 1;
yading@10:         s->c_predictor_table[i+(j-1)] |= 1;
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void gen_vector_table16(TrueMotion1Context *s, const uint8_t *sel_vector_table)
yading@10: {
yading@10:     int len, i, j;
yading@10:     unsigned char delta_pair;
yading@10: 
yading@10:     for (i = 0; i < 1024; i += 4)
yading@10:     {
yading@10:         len = *sel_vector_table++ / 2;
yading@10:         for (j = 0; j < len; j++)
yading@10:         {
yading@10:             delta_pair = *sel_vector_table++;
yading@10:             s->y_predictor_table[i+j] = 0xfffffffe &
yading@10:                 make_ydt16_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
yading@10:             s->c_predictor_table[i+j] = 0xfffffffe &
yading@10:                 make_cdt16_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
yading@10:         }
yading@10:         s->y_predictor_table[i+(j-1)] |= 1;
yading@10:         s->c_predictor_table[i+(j-1)] |= 1;
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void gen_vector_table24(TrueMotion1Context *s, const uint8_t *sel_vector_table)
yading@10: {
yading@10:     int len, i, j;
yading@10:     unsigned char delta_pair;
yading@10: 
yading@10:     for (i = 0; i < 1024; i += 4)
yading@10:     {
yading@10:         len = *sel_vector_table++ / 2;
yading@10:         for (j = 0; j < len; j++)
yading@10:         {
yading@10:             delta_pair = *sel_vector_table++;
yading@10:             s->y_predictor_table[i+j] = 0xfffffffe &
yading@10:                 make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
yading@10:             s->c_predictor_table[i+j] = 0xfffffffe &
yading@10:                 make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
yading@10:             s->fat_y_predictor_table[i+j] = 0xfffffffe &
yading@10:                 make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_ydt);
yading@10:             s->fat_c_predictor_table[i+j] = 0xfffffffe &
yading@10:                 make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_cdt);
yading@10:         }
yading@10:         s->y_predictor_table[i+(j-1)] |= 1;
yading@10:         s->c_predictor_table[i+(j-1)] |= 1;
yading@10:         s->fat_y_predictor_table[i+(j-1)] |= 1;
yading@10:         s->fat_c_predictor_table[i+(j-1)] |= 1;
yading@10:     }
yading@10: }
yading@10: 
yading@10: /* Returns the number of bytes consumed from the bytestream. Returns -1 if
yading@10:  * there was an error while decoding the header */
yading@10: static int truemotion1_decode_header(TrueMotion1Context *s)
yading@10: {
yading@10:     int i, ret;
yading@10:     int width_shift = 0;
yading@10:     int new_pix_fmt;
yading@10:     struct frame_header header;
yading@10:     uint8_t header_buffer[128] = { 0 };  /* logical maximum size of the header */
yading@10:     const uint8_t *sel_vector_table;
yading@10: 
yading@10:     header.header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f;
yading@10:     if (s->buf[0] < 0x10 || header.header_size >= s->size)
yading@10:     {
yading@10:         av_log(s->avctx, AV_LOG_ERROR, "invalid header size (%d)\n", s->buf[0]);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     /* unscramble the header bytes with a XOR operation */
yading@10:     for (i = 1; i < header.header_size; i++)
yading@10:         header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1];
yading@10: 
yading@10:     header.compression = header_buffer[0];
yading@10:     header.deltaset = header_buffer[1];
yading@10:     header.vectable = header_buffer[2];
yading@10:     header.ysize = AV_RL16(&header_buffer[3]);
yading@10:     header.xsize = AV_RL16(&header_buffer[5]);
yading@10:     header.checksum = AV_RL16(&header_buffer[7]);
yading@10:     header.version = header_buffer[9];
yading@10:     header.header_type = header_buffer[10];
yading@10:     header.flags = header_buffer[11];
yading@10:     header.control = header_buffer[12];
yading@10: 
yading@10:     /* Version 2 */
yading@10:     if (header.version >= 2)
yading@10:     {
yading@10:         if (header.header_type > 3)
yading@10:         {
yading@10:             av_log(s->avctx, AV_LOG_ERROR, "invalid header type (%d)\n", header.header_type);
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         } else if ((header.header_type == 2) || (header.header_type == 3)) {
yading@10:             s->flags = header.flags;
yading@10:             if (!(s->flags & FLAG_INTERFRAME))
yading@10:                 s->flags |= FLAG_KEYFRAME;
yading@10:         } else
yading@10:             s->flags = FLAG_KEYFRAME;
yading@10:     } else /* Version 1 */
yading@10:         s->flags = FLAG_KEYFRAME;
yading@10: 
yading@10:     if (s->flags & FLAG_SPRITE) {
yading@10:         avpriv_request_sample(s->avctx, "Frame with sprite");
yading@10:         /* FIXME header.width, height, xoffset and yoffset aren't initialized */
yading@10:         return AVERROR_PATCHWELCOME;
yading@10:     } else {
yading@10:         s->w = header.xsize;
yading@10:         s->h = header.ysize;
yading@10:         if (header.header_type < 2) {
yading@10:             if ((s->w < 213) && (s->h >= 176))
yading@10:             {
yading@10:                 s->flags |= FLAG_INTERPOLATED;
yading@10:                 avpriv_request_sample(s->avctx, "Interpolated frame");
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (header.compression >= 17) {
yading@10:         av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if ((header.deltaset != s->last_deltaset) ||
yading@10:         (header.vectable != s->last_vectable))
yading@10:         select_delta_tables(s, header.deltaset);
yading@10: 
yading@10:     if ((header.compression & 1) && header.header_type)
yading@10:         sel_vector_table = pc_tbl2;
yading@10:     else {
yading@10:         if (header.vectable > 0 && header.vectable < 4)
yading@10:             sel_vector_table = tables[header.vectable - 1];
yading@10:         else {
yading@10:             av_log(s->avctx, AV_LOG_ERROR, "invalid vector table id (%d)\n", header.vectable);
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (compression_types[header.compression].algorithm == ALGO_RGB24H) {
yading@10:         new_pix_fmt = AV_PIX_FMT_RGB32;
yading@10:         width_shift = 1;
yading@10:     } else
yading@10:         new_pix_fmt = AV_PIX_FMT_RGB555; // RGB565 is supported as well
yading@10: 
yading@10:     s->w >>= width_shift;
yading@10:     if ((ret = av_image_check_size(s->w, s->h, 0, s->avctx)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     if (s->w != s->avctx->width || s->h != s->avctx->height ||
yading@10:         new_pix_fmt != s->avctx->pix_fmt) {
yading@10:         av_frame_unref(&s->frame);
yading@10:         s->avctx->sample_aspect_ratio = (AVRational){ 1 << width_shift, 1 };
yading@10:         s->avctx->pix_fmt = new_pix_fmt;
yading@10:         avcodec_set_dimensions(s->avctx, s->w, s->h);
yading@10:         av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
yading@10:     }
yading@10: 
yading@10:     /* There is 1 change bit per 4 pixels, so each change byte represents
yading@10:      * 32 pixels; divide width by 4 to obtain the number of change bits and
yading@10:      * then round up to the nearest byte. */
yading@10:     s->mb_change_bits_row_size = ((s->avctx->width >> (2 - width_shift)) + 7) >> 3;
yading@10: 
yading@10:     if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable))
yading@10:     {
yading@10:         if (compression_types[header.compression].algorithm == ALGO_RGB24H)
yading@10:             gen_vector_table24(s, sel_vector_table);
yading@10:         else
yading@10:         if (s->avctx->pix_fmt == AV_PIX_FMT_RGB555)
yading@10:             gen_vector_table15(s, sel_vector_table);
yading@10:         else
yading@10:             gen_vector_table16(s, sel_vector_table);
yading@10:     }
yading@10: 
yading@10:     /* set up pointers to the other key data chunks */
yading@10:     s->mb_change_bits = s->buf + header.header_size;
yading@10:     if (s->flags & FLAG_KEYFRAME) {
yading@10:         /* no change bits specified for a keyframe; only index bytes */
yading@10:         s->index_stream = s->mb_change_bits;
yading@10:     } else {
yading@10:         /* one change bit per 4x4 block */
yading@10:         s->index_stream = s->mb_change_bits +
yading@10:             (s->mb_change_bits_row_size * (s->avctx->height >> 2));
yading@10:     }
yading@10:     s->index_stream_size = s->size - (s->index_stream - s->buf);
yading@10: 
yading@10:     s->last_deltaset = header.deltaset;
yading@10:     s->last_vectable = header.vectable;
yading@10:     s->compression = header.compression;
yading@10:     s->block_width = compression_types[header.compression].block_width;
yading@10:     s->block_height = compression_types[header.compression].block_height;
yading@10:     s->block_type = compression_types[header.compression].block_type;
yading@10: 
yading@10:     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
yading@10:         av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n",
yading@10:             s->last_deltaset, s->last_vectable, s->compression, s->block_width,
yading@10:             s->block_height, s->block_type,
yading@10:             s->flags & FLAG_KEYFRAME ? " KEY" : "",
yading@10:             s->flags & FLAG_INTERFRAME ? " INTER" : "",
yading@10:             s->flags & FLAG_SPRITE ? " SPRITE" : "",
yading@10:             s->flags & FLAG_INTERPOLATED ? " INTERPOL" : "");
yading@10: 
yading@10:     return header.header_size;
yading@10: }
yading@10: 
yading@10: static av_cold int truemotion1_decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     TrueMotion1Context *s = avctx->priv_data;
yading@10: 
yading@10:     s->avctx = avctx;
yading@10: 
yading@10:     // FIXME: it may change ?
yading@10: //    if (avctx->bits_per_sample == 24)
yading@10: //        avctx->pix_fmt = AV_PIX_FMT_RGB24;
yading@10: //    else
yading@10: //        avctx->pix_fmt = AV_PIX_FMT_RGB555;
yading@10: 
yading@10:     avcodec_get_frame_defaults(&s->frame);
yading@10: 
yading@10:     /* there is a vertical predictor for each pixel in a line; each vertical
yading@10:      * predictor is 0 to start with */
yading@10:     av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: /*
yading@10: Block decoding order:
yading@10: 
yading@10: dxi: Y-Y
yading@10: dxic: Y-C-Y
yading@10: dxic2: Y-C-Y-C
yading@10: 
yading@10: hres,vres,i,i%vres (0 < i < 4)
yading@10: 2x2 0: 0 dxic2
yading@10: 2x2 1: 1 dxi
yading@10: 2x2 2: 0 dxic2
yading@10: 2x2 3: 1 dxi
yading@10: 2x4 0: 0 dxic2
yading@10: 2x4 1: 1 dxi
yading@10: 2x4 2: 2 dxi
yading@10: 2x4 3: 3 dxi
yading@10: 4x2 0: 0 dxic
yading@10: 4x2 1: 1 dxi
yading@10: 4x2 2: 0 dxic
yading@10: 4x2 3: 1 dxi
yading@10: 4x4 0: 0 dxic
yading@10: 4x4 1: 1 dxi
yading@10: 4x4 2: 2 dxi
yading@10: 4x4 3: 3 dxi
yading@10: */
yading@10: 
yading@10: #define GET_NEXT_INDEX() \
yading@10: {\
yading@10:     if (index_stream_index >= s->index_stream_size) { \
yading@10:         av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \
yading@10:         return; \
yading@10:     } \
yading@10:     index = s->index_stream[index_stream_index++] * 4; \
yading@10: }
yading@10: 
yading@10: #define APPLY_C_PREDICTOR() \
yading@10:     if(index > 1023){\
yading@10:         av_log(s->avctx, AV_LOG_ERROR, " index %d went out of bounds\n", index); \
yading@10:         return; \
yading@10:     }\
yading@10:     predictor_pair = s->c_predictor_table[index]; \
yading@10:     horiz_pred += (predictor_pair >> 1); \
yading@10:     if (predictor_pair & 1) { \
yading@10:         GET_NEXT_INDEX() \
yading@10:         if (!index) { \
yading@10:             GET_NEXT_INDEX() \
yading@10:             predictor_pair = s->c_predictor_table[index]; \
yading@10:             horiz_pred += ((predictor_pair >> 1) * 5); \
yading@10:             if (predictor_pair & 1) \
yading@10:                 GET_NEXT_INDEX() \
yading@10:             else \
yading@10:                 index++; \
yading@10:         } \
yading@10:     } else \
yading@10:         index++;
yading@10: 
yading@10: #define APPLY_C_PREDICTOR_24() \
yading@10:     if(index > 1023){\
yading@10:         av_log(s->avctx, AV_LOG_ERROR, " index %d went out of bounds\n", index); \
yading@10:         return; \
yading@10:     }\
yading@10:     predictor_pair = s->c_predictor_table[index]; \
yading@10:     horiz_pred += (predictor_pair >> 1); \
yading@10:     if (predictor_pair & 1) { \
yading@10:         GET_NEXT_INDEX() \
yading@10:         if (!index) { \
yading@10:             GET_NEXT_INDEX() \
yading@10:             predictor_pair = s->fat_c_predictor_table[index]; \
yading@10:             horiz_pred += (predictor_pair >> 1); \
yading@10:             if (predictor_pair & 1) \
yading@10:                 GET_NEXT_INDEX() \
yading@10:             else \
yading@10:                 index++; \
yading@10:         } \
yading@10:     } else \
yading@10:         index++;
yading@10: 
yading@10: 
yading@10: #define APPLY_Y_PREDICTOR() \
yading@10:     if(index > 1023){\
yading@10:         av_log(s->avctx, AV_LOG_ERROR, " index %d went out of bounds\n", index); \
yading@10:         return; \
yading@10:     }\
yading@10:     predictor_pair = s->y_predictor_table[index]; \
yading@10:     horiz_pred += (predictor_pair >> 1); \
yading@10:     if (predictor_pair & 1) { \
yading@10:         GET_NEXT_INDEX() \
yading@10:         if (!index) { \
yading@10:             GET_NEXT_INDEX() \
yading@10:             predictor_pair = s->y_predictor_table[index]; \
yading@10:             horiz_pred += ((predictor_pair >> 1) * 5); \
yading@10:             if (predictor_pair & 1) \
yading@10:                 GET_NEXT_INDEX() \
yading@10:             else \
yading@10:                 index++; \
yading@10:         } \
yading@10:     } else \
yading@10:         index++;
yading@10: 
yading@10: #define APPLY_Y_PREDICTOR_24() \
yading@10:     if(index > 1023){\
yading@10:         av_log(s->avctx, AV_LOG_ERROR, " index %d went out of bounds\n", index); \
yading@10:         return; \
yading@10:     }\
yading@10:     predictor_pair = s->y_predictor_table[index]; \
yading@10:     horiz_pred += (predictor_pair >> 1); \
yading@10:     if (predictor_pair & 1) { \
yading@10:         GET_NEXT_INDEX() \
yading@10:         if (!index) { \
yading@10:             GET_NEXT_INDEX() \
yading@10:             predictor_pair = s->fat_y_predictor_table[index]; \
yading@10:             horiz_pred += (predictor_pair >> 1); \
yading@10:             if (predictor_pair & 1) \
yading@10:                 GET_NEXT_INDEX() \
yading@10:             else \
yading@10:                 index++; \
yading@10:         } \
yading@10:     } else \
yading@10:         index++;
yading@10: 
yading@10: #define OUTPUT_PIXEL_PAIR() \
yading@10:     *current_pixel_pair = *vert_pred + horiz_pred; \
yading@10:     *vert_pred++ = *current_pixel_pair++;
yading@10: 
yading@10: static void truemotion1_decode_16bit(TrueMotion1Context *s)
yading@10: {
yading@10:     int y;
yading@10:     int pixels_left;  /* remaining pixels on this line */
yading@10:     unsigned int predictor_pair;
yading@10:     unsigned int horiz_pred;
yading@10:     unsigned int *vert_pred;
yading@10:     unsigned int *current_pixel_pair;
yading@10:     unsigned char *current_line = s->frame.data[0];
yading@10:     int keyframe = s->flags & FLAG_KEYFRAME;
yading@10: 
yading@10:     /* these variables are for managing the stream of macroblock change bits */
yading@10:     const unsigned char *mb_change_bits = s->mb_change_bits;
yading@10:     unsigned char mb_change_byte;
yading@10:     unsigned char mb_change_byte_mask;
yading@10:     int mb_change_index;
yading@10: 
yading@10:     /* these variables are for managing the main index stream */
yading@10:     int index_stream_index = 0;  /* yes, the index into the index stream */
yading@10:     int index;
yading@10: 
yading@10:     /* clean out the line buffer */
yading@10:     memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
yading@10: 
yading@10:     GET_NEXT_INDEX();
yading@10: 
yading@10:     for (y = 0; y < s->avctx->height; y++) {
yading@10: 
yading@10:         /* re-init variables for the next line iteration */
yading@10:         horiz_pred = 0;
yading@10:         current_pixel_pair = (unsigned int *)current_line;
yading@10:         vert_pred = s->vert_pred;
yading@10:         mb_change_index = 0;
yading@10:         mb_change_byte = mb_change_bits[mb_change_index++];
yading@10:         mb_change_byte_mask = 0x01;
yading@10:         pixels_left = s->avctx->width;
yading@10: 
yading@10:         while (pixels_left > 0) {
yading@10: 
yading@10:             if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
yading@10: 
yading@10:                 switch (y & 3) {
yading@10:                 case 0:
yading@10:                     /* if macroblock width is 2, apply C-Y-C-Y; else
yading@10:                      * apply C-Y-Y */
yading@10:                     if (s->block_width == 2) {
yading@10:                         APPLY_C_PREDICTOR();
yading@10:                         APPLY_Y_PREDICTOR();
yading@10:                         OUTPUT_PIXEL_PAIR();
yading@10:                         APPLY_C_PREDICTOR();
yading@10:                         APPLY_Y_PREDICTOR();
yading@10:                         OUTPUT_PIXEL_PAIR();
yading@10:                     } else {
yading@10:                         APPLY_C_PREDICTOR();
yading@10:                         APPLY_Y_PREDICTOR();
yading@10:                         OUTPUT_PIXEL_PAIR();
yading@10:                         APPLY_Y_PREDICTOR();
yading@10:                         OUTPUT_PIXEL_PAIR();
yading@10:                     }
yading@10:                     break;
yading@10: 
yading@10:                 case 1:
yading@10:                 case 3:
yading@10:                     /* always apply 2 Y predictors on these iterations */
yading@10:                     APPLY_Y_PREDICTOR();
yading@10:                     OUTPUT_PIXEL_PAIR();
yading@10:                     APPLY_Y_PREDICTOR();
yading@10:                     OUTPUT_PIXEL_PAIR();
yading@10:                     break;
yading@10: 
yading@10:                 case 2:
yading@10:                     /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
yading@10:                      * depending on the macroblock type */
yading@10:                     if (s->block_type == BLOCK_2x2) {
yading@10:                         APPLY_C_PREDICTOR();
yading@10:                         APPLY_Y_PREDICTOR();
yading@10:                         OUTPUT_PIXEL_PAIR();
yading@10:                         APPLY_C_PREDICTOR();
yading@10:                         APPLY_Y_PREDICTOR();
yading@10:                         OUTPUT_PIXEL_PAIR();
yading@10:                     } else if (s->block_type == BLOCK_4x2) {
yading@10:                         APPLY_C_PREDICTOR();
yading@10:                         APPLY_Y_PREDICTOR();
yading@10:                         OUTPUT_PIXEL_PAIR();
yading@10:                         APPLY_Y_PREDICTOR();
yading@10:                         OUTPUT_PIXEL_PAIR();
yading@10:                     } else {
yading@10:                         APPLY_Y_PREDICTOR();
yading@10:                         OUTPUT_PIXEL_PAIR();
yading@10:                         APPLY_Y_PREDICTOR();
yading@10:                         OUTPUT_PIXEL_PAIR();
yading@10:                     }
yading@10:                     break;
yading@10:                 }
yading@10: 
yading@10:             } else {
yading@10: 
yading@10:                 /* skip (copy) four pixels, but reassign the horizontal
yading@10:                  * predictor */
yading@10:                 *vert_pred++ = *current_pixel_pair++;
yading@10:                 horiz_pred = *current_pixel_pair - *vert_pred;
yading@10:                 *vert_pred++ = *current_pixel_pair++;
yading@10: 
yading@10:             }
yading@10: 
yading@10:             if (!keyframe) {
yading@10:                 mb_change_byte_mask <<= 1;
yading@10: 
yading@10:                 /* next byte */
yading@10:                 if (!mb_change_byte_mask) {
yading@10:                     mb_change_byte = mb_change_bits[mb_change_index++];
yading@10:                     mb_change_byte_mask = 0x01;
yading@10:                 }
yading@10:             }
yading@10: 
yading@10:             pixels_left -= 4;
yading@10:         }
yading@10: 
yading@10:         /* next change row */
yading@10:         if (((y + 1) & 3) == 0)
yading@10:             mb_change_bits += s->mb_change_bits_row_size;
yading@10: 
yading@10:         current_line += s->frame.linesize[0];
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void truemotion1_decode_24bit(TrueMotion1Context *s)
yading@10: {
yading@10:     int y;
yading@10:     int pixels_left;  /* remaining pixels on this line */
yading@10:     unsigned int predictor_pair;
yading@10:     unsigned int horiz_pred;
yading@10:     unsigned int *vert_pred;
yading@10:     unsigned int *current_pixel_pair;
yading@10:     unsigned char *current_line = s->frame.data[0];
yading@10:     int keyframe = s->flags & FLAG_KEYFRAME;
yading@10: 
yading@10:     /* these variables are for managing the stream of macroblock change bits */
yading@10:     const unsigned char *mb_change_bits = s->mb_change_bits;
yading@10:     unsigned char mb_change_byte;
yading@10:     unsigned char mb_change_byte_mask;
yading@10:     int mb_change_index;
yading@10: 
yading@10:     /* these variables are for managing the main index stream */
yading@10:     int index_stream_index = 0;  /* yes, the index into the index stream */
yading@10:     int index;
yading@10: 
yading@10:     /* clean out the line buffer */
yading@10:     memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
yading@10: 
yading@10:     GET_NEXT_INDEX();
yading@10: 
yading@10:     for (y = 0; y < s->avctx->height; y++) {
yading@10: 
yading@10:         /* re-init variables for the next line iteration */
yading@10:         horiz_pred = 0;
yading@10:         current_pixel_pair = (unsigned int *)current_line;
yading@10:         vert_pred = s->vert_pred;
yading@10:         mb_change_index = 0;
yading@10:         mb_change_byte = mb_change_bits[mb_change_index++];
yading@10:         mb_change_byte_mask = 0x01;
yading@10:         pixels_left = s->avctx->width;
yading@10: 
yading@10:         while (pixels_left > 0) {
yading@10: 
yading@10:             if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
yading@10: 
yading@10:                 switch (y & 3) {
yading@10:                 case 0:
yading@10:                     /* if macroblock width is 2, apply C-Y-C-Y; else
yading@10:                      * apply C-Y-Y */
yading@10:                     if (s->block_width == 2) {
yading@10:                         APPLY_C_PREDICTOR_24();
yading@10:                         APPLY_Y_PREDICTOR_24();
yading@10:                         OUTPUT_PIXEL_PAIR();
yading@10:                         APPLY_C_PREDICTOR_24();
yading@10:                         APPLY_Y_PREDICTOR_24();
yading@10:                         OUTPUT_PIXEL_PAIR();
yading@10:                     } else {
yading@10:                         APPLY_C_PREDICTOR_24();
yading@10:                         APPLY_Y_PREDICTOR_24();
yading@10:                         OUTPUT_PIXEL_PAIR();
yading@10:                         APPLY_Y_PREDICTOR_24();
yading@10:                         OUTPUT_PIXEL_PAIR();
yading@10:                     }
yading@10:                     break;
yading@10: 
yading@10:                 case 1:
yading@10:                 case 3:
yading@10:                     /* always apply 2 Y predictors on these iterations */
yading@10:                     APPLY_Y_PREDICTOR_24();
yading@10:                     OUTPUT_PIXEL_PAIR();
yading@10:                     APPLY_Y_PREDICTOR_24();
yading@10:                     OUTPUT_PIXEL_PAIR();
yading@10:                     break;
yading@10: 
yading@10:                 case 2:
yading@10:                     /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
yading@10:                      * depending on the macroblock type */
yading@10:                     if (s->block_type == BLOCK_2x2) {
yading@10:                         APPLY_C_PREDICTOR_24();
yading@10:                         APPLY_Y_PREDICTOR_24();
yading@10:                         OUTPUT_PIXEL_PAIR();
yading@10:                         APPLY_C_PREDICTOR_24();
yading@10:                         APPLY_Y_PREDICTOR_24();
yading@10:                         OUTPUT_PIXEL_PAIR();
yading@10:                     } else if (s->block_type == BLOCK_4x2) {
yading@10:                         APPLY_C_PREDICTOR_24();
yading@10:                         APPLY_Y_PREDICTOR_24();
yading@10:                         OUTPUT_PIXEL_PAIR();
yading@10:                         APPLY_Y_PREDICTOR_24();
yading@10:                         OUTPUT_PIXEL_PAIR();
yading@10:                     } else {
yading@10:                         APPLY_Y_PREDICTOR_24();
yading@10:                         OUTPUT_PIXEL_PAIR();
yading@10:                         APPLY_Y_PREDICTOR_24();
yading@10:                         OUTPUT_PIXEL_PAIR();
yading@10:                     }
yading@10:                     break;
yading@10:                 }
yading@10: 
yading@10:             } else {
yading@10: 
yading@10:                 /* skip (copy) four pixels, but reassign the horizontal
yading@10:                  * predictor */
yading@10:                 *vert_pred++ = *current_pixel_pair++;
yading@10:                 horiz_pred = *current_pixel_pair - *vert_pred;
yading@10:                 *vert_pred++ = *current_pixel_pair++;
yading@10: 
yading@10:             }
yading@10: 
yading@10:             if (!keyframe) {
yading@10:                 mb_change_byte_mask <<= 1;
yading@10: 
yading@10:                 /* next byte */
yading@10:                 if (!mb_change_byte_mask) {
yading@10:                     mb_change_byte = mb_change_bits[mb_change_index++];
yading@10:                     mb_change_byte_mask = 0x01;
yading@10:                 }
yading@10:             }
yading@10: 
yading@10:             pixels_left -= 2;
yading@10:         }
yading@10: 
yading@10:         /* next change row */
yading@10:         if (((y + 1) & 3) == 0)
yading@10:             mb_change_bits += s->mb_change_bits_row_size;
yading@10: 
yading@10:         current_line += s->frame.linesize[0];
yading@10:     }
yading@10: }
yading@10: 
yading@10: 
yading@10: static int truemotion1_decode_frame(AVCodecContext *avctx,
yading@10:                                     void *data, int *got_frame,
yading@10:                                     AVPacket *avpkt)
yading@10: {
yading@10:     const uint8_t *buf = avpkt->data;
yading@10:     int ret, buf_size = avpkt->size;
yading@10:     TrueMotion1Context *s = avctx->priv_data;
yading@10: 
yading@10:     s->buf = buf;
yading@10:     s->size = buf_size;
yading@10: 
yading@10:     if ((ret = truemotion1_decode_header(s)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     if ((ret = ff_reget_buffer(avctx, &s->frame)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     if (compression_types[s->compression].algorithm == ALGO_RGB24H) {
yading@10:         truemotion1_decode_24bit(s);
yading@10:     } else if (compression_types[s->compression].algorithm != ALGO_NOP) {
yading@10:         truemotion1_decode_16bit(s);
yading@10:     }
yading@10: 
yading@10:     if ((ret = av_frame_ref(data, &s->frame)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     *got_frame      = 1;
yading@10: 
yading@10:     /* report that the buffer was completely consumed */
yading@10:     return buf_size;
yading@10: }
yading@10: 
yading@10: static av_cold int truemotion1_decode_end(AVCodecContext *avctx)
yading@10: {
yading@10:     TrueMotion1Context *s = avctx->priv_data;
yading@10: 
yading@10:     av_frame_unref(&s->frame);
yading@10:     av_free(s->vert_pred);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: AVCodec ff_truemotion1_decoder = {
yading@10:     .name           = "truemotion1",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_TRUEMOTION1,
yading@10:     .priv_data_size = sizeof(TrueMotion1Context),
yading@10:     .init           = truemotion1_decode_init,
yading@10:     .close          = truemotion1_decode_end,
yading@10:     .decode         = truemotion1_decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Duck TrueMotion 1.0"),
yading@10: };