quicktime/ffmpeg/libavcodec/truemotion1.c

   1 /*
   2  * Duck TrueMotion 1.0 Decoder
   3  * Copyright (C) 2003 Alex Beregszaszi & Mike Melanson
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19
  20 /**
  21  * @file truemotion1.c
  22  * Duck TrueMotion v1 Video Decoder by
  23  * Alex Beregszaszi (alex@fsn.hu) and
  24  * Mike Melanson (melanson@pcisys.net)
  25  *
  26  * The TrueMotion v1 decoder presently only decodes 16-bit TM1 data and
  27  * outputs RGB555 (or RGB565) data. 24-bit TM1 data is not supported yet.
  28  */
  29
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <unistd.h>
  34
  35 #include "common.h"
  36 #include "avcodec.h"
  37 #include "dsputil.h"
  38
  39 #include "truemotion1data.h"
  40
  41 typedef struct TrueMotion1Context {
  42     AVCodecContext *avctx;
  43     AVFrame frame;
  44     AVFrame prev_frame;
  45
  46     uint8_t *buf;
  47     int size;
  48
  49     uint8_t *mb_change_bits;
  50     int mb_change_bits_row_size;
  51     uint8_t *index_stream;
  52     int index_stream_size;
  53
  54     int flags;
  55     int x, y, w, h;
  56
  57     uint32_t y_predictor_table[1024];
  58     uint32_t c_predictor_table[1024];
  59     uint32_t fat_y_predictor_table[1024];
  60     uint32_t fat_c_predictor_table[1024];
  61
  62     int compression;
  63     int block_type;
  64     int block_width;
  65     int block_height;
  66
  67     int16_t ydt[8];
  68     int16_t cdt[8];
  69     int16_t fat_ydt[8];
  70     int16_t fat_cdt[8];
  71
  72     int last_deltaset, last_vectable;
  73
  74     unsigned int *vert_pred;
  75
  76 } TrueMotion1Context;
  77
  78 #define FLAG_SPRITE         32
  79 #define FLAG_KEYFRAME       16
  80 #define FLAG_INTERFRAME      8
  81 #define FLAG_INTERPOLATED    4
  82
  83 struct frame_header {
  84     uint8_t header_size;
  85     uint8_t compression;
  86     uint8_t deltaset;
  87     uint8_t vectable;
  88     uint16_t ysize;
  89     uint16_t xsize;
  90     uint16_t checksum;
  91     uint8_t version;
  92     uint8_t header_type;
  93     uint8_t flags;
  94     uint8_t control;
  95     uint16_t xoffset;
  96     uint16_t yoffset;
  97     uint16_t width;
  98     uint16_t height;
  99 };
 100
 101 #define ALGO_NOP        0
 102 #define ALGO_RGB16V     1
 103 #define ALGO_RGB16H     2
 104 #define ALGO_RGB24H     3
 105
 106 /* these are the various block sizes that can occupy a 4x4 block */
 107 #define BLOCK_2x2  0
 108 #define BLOCK_2x4  1
 109 #define BLOCK_4x2  2
 110 #define BLOCK_4x4  3
 111
 112 typedef struct comp_types {
 113     int algorithm;
 114     int block_width; // vres
 115     int block_height; // hres
 116     int block_type;
 117 } comp_types;
 118
 119 /* { valid for metatype }, algorithm, num of deltas, vert res, horiz res */
 120 static comp_types compression_types[17] = {
 121     { ALGO_NOP,    0, 0, 0 },
 122
 123     { ALGO_RGB16V, 4, 4, BLOCK_4x4 },
 124     { ALGO_RGB16H, 4, 4, BLOCK_4x4 },
 125     { ALGO_RGB16V, 4, 2, BLOCK_4x2 },
 126     { ALGO_RGB16H, 4, 2, BLOCK_4x2 },
 127
 128     { ALGO_RGB16V, 2, 4, BLOCK_2x4 },
 129     { ALGO_RGB16H, 2, 4, BLOCK_2x4 },
 130     { ALGO_RGB16V, 2, 2, BLOCK_2x2 },
 131     { ALGO_RGB16H, 2, 2, BLOCK_2x2 },
 132
 133     { ALGO_NOP,    4, 4, BLOCK_4x4 },
 134     { ALGO_RGB24H, 4, 4, BLOCK_4x4 },
 135     { ALGO_NOP,    4, 2, BLOCK_4x2 },
 136     { ALGO_RGB24H, 4, 2, BLOCK_4x2 },
 137
 138     { ALGO_NOP,    2, 4, BLOCK_2x4 },
 139     { ALGO_RGB24H, 2, 4, BLOCK_2x4 },
 140     { ALGO_NOP,    2, 2, BLOCK_2x2 },
 141     { ALGO_RGB24H, 2, 2, BLOCK_2x2 }
 142 };
 143
 144 static void select_delta_tables(TrueMotion1Context *s, int delta_table_index)
 145 {
 146     int i;
 147
 148     if (delta_table_index > 3)
 149         return;
 150
 151     memcpy(s->ydt, ydts[delta_table_index], 8 * sizeof(int16_t));
 152     memcpy(s->cdt, cdts[delta_table_index], 8 * sizeof(int16_t));
 153     memcpy(s->fat_ydt, fat_ydts[delta_table_index], 8 * sizeof(int16_t));
 154     memcpy(s->fat_cdt, fat_cdts[delta_table_index], 8 * sizeof(int16_t));
 155
 156     /* Y skinny deltas need to be halved for some reason; maybe the
 157      * skinny Y deltas should be modified */
 158     for (i = 0; i < 8; i++)
 159     {
 160         /* drop the lsb before dividing by 2-- net effect: round down
 161          * when dividing a negative number (e.g., -3/2 = -2, not -1) */
 162         s->ydt[i] &= 0xFFFE;
 163         s->ydt[i] /= 2;
 164     }
 165 }
 166
 167 #ifdef WORDS_BIGENDIAN
 168 static int make_ydt15_entry(int p2, int p1, int16_t *ydt)
 169 #else
 170 static int make_ydt15_entry(int p1, int p2, int16_t *ydt)
 171 #endif
 172 {
 173     int lo, hi;
 174
 175     lo = ydt[p1];
 176     lo += (lo << 5) + (lo << 10);
 177     hi = ydt[p2];
 178     hi += (hi << 5) + (hi << 10);
 179     return ((lo + (hi << 16)) << 1);
 180 }
 181
 182 #ifdef WORDS_BIGENDIAN
 183 static int make_cdt15_entry(int p2, int p1, int16_t *cdt)
 184 #else
 185 static int make_cdt15_entry(int p1, int p2, int16_t *cdt)
 186 #endif
 187 {
 188     int r, b, lo;
 189
 190     b = cdt[p2];
 191     r = cdt[p1] << 10;
 192     lo = b + r;
 193     return ((lo + (lo << 16)) << 1);
 194 }
 195
 196 #ifdef WORDS_BIGENDIAN
 197 static int make_ydt16_entry(int p2, int p1, int16_t *ydt)
 198 #else
 199 static int make_ydt16_entry(int p1, int p2, int16_t *ydt)
 200 #endif
 201 {
 202     int lo, hi;
 203
 204     lo = ydt[p1];
 205     lo += (lo << 6) + (lo << 11);
 206     hi = ydt[p2];
 207     hi += (hi << 6) + (hi << 11);
 208     return ((lo + (hi << 16)) << 1);
 209 }
 210
 211 #ifdef WORDS_BIGENDIAN
 212 static int make_cdt16_entry(int p2, int p1, int16_t *cdt)
 213 #else
 214 static int make_cdt16_entry(int p1, int p2, int16_t *cdt)
 215 #endif
 216 {
 217     int r, b, lo;
 218
 219     b = cdt[p2];
 220     r = cdt[p1] << 11;
 221     lo = b + r;
 222     return ((lo + (lo << 16)) << 1);
 223 }
 224
 225 #ifdef WORDS_BIGENDIAN
 226 static int make_ydt24_entry(int p2, int p1, int16_t *ydt)
 227 #else
 228 static int make_ydt24_entry(int p1, int p2, int16_t *ydt)
 229 #endif
 230 {
 231     int lo, hi;
 232
 233     lo = ydt[p1];
 234     hi = ydt[p2];
 235     return ((lo + (hi << 8)) << 1);
 236 }
 237
 238 #ifdef WORDS_BIGENDIAN
 239 static int make_cdt24_entry(int p2, int p1, int16_t *cdt)
 240 #else
 241 static int make_cdt24_entry(int p1, int p2, int16_t *cdt)
 242 #endif
 243 {
 244     int r, b;
 245
 246     b = cdt[p2];
 247     r = cdt[p1]<<16;
 248     return ((b+r) << 1);
 249 }
 250
 251 static void gen_vector_table15(TrueMotion1Context *s, const uint8_t *sel_vector_table)
 252 {
 253     int len, i, j;
 254     unsigned char delta_pair;
 255
 256     for (i = 0; i < 1024; i += 4)
 257     {
 258         len = *sel_vector_table++ / 2;
 259         for (j = 0; j < len; j++)
 260         {
 261             delta_pair = *sel_vector_table++;
 262             s->y_predictor_table[i+j] = 0xfffffffe &
 263                 make_ydt15_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
 264             s->c_predictor_table[i+j] = 0xfffffffe &
 265                 make_cdt15_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
 266         }
 267         s->y_predictor_table[i+(j-1)] |= 1;
 268         s->c_predictor_table[i+(j-1)] |= 1;
 269     }
 270 }
 271
 272 static void gen_vector_table16(TrueMotion1Context *s, const uint8_t *sel_vector_table)
 273 {
 274     int len, i, j;
 275     unsigned char delta_pair;
 276
 277     for (i = 0; i < 1024; i += 4)
 278     {
 279         len = *sel_vector_table++ / 2;
 280         for (j = 0; j < len; j++)
 281         {
 282             delta_pair = *sel_vector_table++;
 283             s->y_predictor_table[i+j] = 0xfffffffe &
 284                 make_ydt16_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
 285             s->c_predictor_table[i+j] = 0xfffffffe &
 286                 make_cdt16_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
 287         }
 288         s->y_predictor_table[i+(j-1)] |= 1;
 289         s->c_predictor_table[i+(j-1)] |= 1;
 290     }
 291 }
 292
 293 static void gen_vector_table24(TrueMotion1Context *s, const uint8_t *sel_vector_table)
 294 {
 295     int len, i, j;
 296     unsigned char delta_pair;
 297
 298     for (i = 0; i < 1024; i += 4)
 299     {
 300         len = *sel_vector_table++ / 2;
 301         for (j = 0; j < len; j++)
 302         {
 303             delta_pair = *sel_vector_table++;
 304             s->y_predictor_table[i+j] = 0xfffffffe &
 305                 make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
 306             s->c_predictor_table[i+j] = 0xfffffffe &
 307                 make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
 308             s->fat_y_predictor_table[i+j] = 0xfffffffe &
 309                 make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_ydt);
 310             s->fat_c_predictor_table[i+j] = 0xfffffffe &
 311                 make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_cdt);
 312         }
 313         s->y_predictor_table[i+(j-1)] |= 1;
 314         s->c_predictor_table[i+(j-1)] |= 1;
 315         s->fat_y_predictor_table[i+(j-1)] |= 1;
 316         s->fat_c_predictor_table[i+(j-1)] |= 1;
 317     }
 318 }
 319
 320 /* Returns the number of bytes consumed from the bytestream. Returns -1 if
 321  * there was an error while decoding the header */
 322 static int truemotion1_decode_header(TrueMotion1Context *s)
 323 {
 324     int i;
 325     struct frame_header header;
 326     uint8_t header_buffer[128];  /* logical maximum size of the header */
 327     const uint8_t *sel_vector_table;
 328
 329     /* There is 1 change bit per 4 pixels, so each change byte represents
 330      * 32 pixels; divide width by 4 to obtain the number of change bits and
 331      * then round up to the nearest byte. */
 332     s->mb_change_bits_row_size = ((s->avctx->width >> 2) + 7) >> 3;
 333
 334     header.header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f;
 335     if (s->buf[0] < 0x10)
 336     {
 337         av_log(s->avctx, AV_LOG_ERROR, "invalid header size (%d)\n", s->buf[0]);
 338         return -1;
 339     }
 340
 341     /* unscramble the header bytes with a XOR operation */
 342     memset(header_buffer, 0, 128);
 343     for (i = 1; i < header.header_size; i++)
 344         header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1];
 345
 346     header.compression = header_buffer[0];
 347     header.deltaset = header_buffer[1];
 348     header.vectable = header_buffer[2];
 349     header.ysize = LE_16(&header_buffer[3]);
 350     header.xsize = LE_16(&header_buffer[5]);
 351     header.checksum = LE_16(&header_buffer[7]);
 352     header.version = header_buffer[9];
 353     header.header_type = header_buffer[10];
 354     header.flags = header_buffer[11];
 355     header.control = header_buffer[12];
 356
 357     /* Version 2 */
 358     if (header.version >= 2)
 359     {
 360         if (header.header_type > 3)
 361         {
 362             av_log(s->avctx, AV_LOG_ERROR, "invalid header type (%d)\n", header.header_type);
 363             return -1;
 364         } else if ((header.header_type == 2) || (header.header_type == 3)) {
 365             s->flags = header.flags;
 366             if (!(s->flags & FLAG_INTERFRAME))
 367                 s->flags |= FLAG_KEYFRAME;
 368         } else
 369             s->flags = FLAG_KEYFRAME;
 370     } else /* Version 1 */
 371         s->flags = FLAG_KEYFRAME;
 372
 373     if (s->flags & FLAG_SPRITE) {
 374         av_log(s->avctx, AV_LOG_INFO, "SPRITE frame found, please report the sample to the developers\n");
 375         s->w = header.width;
 376         s->h = header.height;
 377         s->x = header.xoffset;
 378         s->y = header.yoffset;
 379     } else {
 380         s->w = header.xsize;
 381         s->h = header.ysize;
 382         if (header.header_type < 2) {
 383             if ((s->w < 213) && (s->h >= 176))
 384             {
 385                 s->flags |= FLAG_INTERPOLATED;
 386                 av_log(s->avctx, AV_LOG_INFO, "INTERPOLATION selected, please report the sample to the developers\n");
 387             }
 388         }
 389     }
 390
 391     if (header.compression > 17) {
 392         av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression);
 393         return -1;
 394     }
 395
 396     if ((header.deltaset != s->last_deltaset) ||
 397         (header.vectable != s->last_vectable))
 398         select_delta_tables(s, header.deltaset);
 399
 400     if ((header.compression & 1) && header.header_type)
 401         sel_vector_table = pc_tbl2;
 402     else {
 403         if (header.vectable < 4)
 404             sel_vector_table = tables[header.vectable - 1];
 405         else {
 406             av_log(s->avctx, AV_LOG_ERROR, "invalid vector table id (%d)\n", header.vectable);
 407             return -1;
 408         }
 409     }
 410
 411     // FIXME: where to place this ?!?!
 412     if (compression_types[header.compression].algorithm == ALGO_RGB24H)
 413         s->avctx->pix_fmt = PIX_FMT_BGR24;
 414     else
 415         s->avctx->pix_fmt = PIX_FMT_RGB555; // RGB565 is supported aswell
 416
 417     if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable))
 418     {
 419         if (compression_types[header.compression].algorithm == ALGO_RGB24H)
 420             gen_vector_table24(s, sel_vector_table);
 421         else
 422         if (s->avctx->pix_fmt == PIX_FMT_RGB555)
 423             gen_vector_table15(s, sel_vector_table);
 424         else
 425             gen_vector_table16(s, sel_vector_table);
 426     }
 427
 428     /* set up pointers to the other key data chunks */
 429     s->mb_change_bits = s->buf + header.header_size;
 430     if (s->flags & FLAG_KEYFRAME) {
 431         /* no change bits specified for a keyframe; only index bytes */
 432         s->index_stream = s->mb_change_bits;
 433     } else {
 434         /* one change bit per 4x4 block */
 435         s->index_stream = s->mb_change_bits +
 436             (s->mb_change_bits_row_size * (s->avctx->height >> 2));
 437     }
 438     s->index_stream_size = s->size - (s->index_stream - s->buf);
 439
 440     s->last_deltaset = header.deltaset;
 441     s->last_vectable = header.vectable;
 442     s->compression = header.compression;
 443     s->block_width = compression_types[header.compression].block_width;
 444     s->block_height = compression_types[header.compression].block_height;
 445     s->block_type = compression_types[header.compression].block_type;
 446
 447     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
 448         av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n",
 449             s->last_deltaset, s->last_vectable, s->compression, s->block_width,
 450             s->block_height, s->block_type,
 451             s->flags & FLAG_KEYFRAME ? " KEY" : "",
 452             s->flags & FLAG_INTERFRAME ? " INTER" : "",
 453             s->flags & FLAG_SPRITE ? " SPRITE" : "",
 454             s->flags & FLAG_INTERPOLATED ? " INTERPOL" : "");
 455
 456     return header.header_size;
 457 }
 458
 459 static int truemotion1_decode_init(AVCodecContext *avctx)
 460 {
 461     TrueMotion1Context *s = (TrueMotion1Context *)avctx->priv_data;
 462
 463     s->avctx = avctx;
 464
 465     // FIXME: it may change ?
 466 //    if (avctx->bits_per_sample == 24)
 467 //      avctx->pix_fmt = PIX_FMT_RGB24;
 468 //    else
 469 //      avctx->pix_fmt = PIX_FMT_RGB555;
 470
 471     avctx->has_b_frames = 0;
 472     s->frame.data[0] = s->prev_frame.data[0] = NULL;
 473
 474     /* there is a vertical predictor for each pixel in a line; each vertical
 475      * predictor is 0 to start with */
 476     s->vert_pred =
 477         (unsigned int *)av_malloc(s->avctx->width * sizeof(unsigned short));
 478
 479     return 0;
 480 }
 481
 482 /*
 483 Block decoding order:
 484
 485 dxi: Y-Y
 486 dxic: Y-C-Y
 487 dxic2: Y-C-Y-C
 488
 489 hres,vres,i,i%vres (0 < i < 4)
 490 2x2 0: 0 dxic2
 491 2x2 1: 1 dxi
 492 2x2 2: 0 dxic2
 493 2x2 3: 1 dxi
 494 2x4 0: 0 dxic2
 495 2x4 1: 1 dxi
 496 2x4 2: 2 dxi
 497 2x4 3: 3 dxi
 498 4x2 0: 0 dxic
 499 4x2 1: 1 dxi
 500 4x2 2: 0 dxic
 501 4x2 3: 1 dxi
 502 4x4 0: 0 dxic
 503 4x4 1: 1 dxi
 504 4x4 2: 2 dxi
 505 4x4 3: 3 dxi
 506 */
 507
 508 #define GET_NEXT_INDEX() \
 509 {\
 510     if (index_stream_index >= s->index_stream_size) { \
 511         av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \
 512         return; \
 513     } \
 514     index = s->index_stream[index_stream_index++] * 4; \
 515 }
 516
 517 #define APPLY_C_PREDICTOR() \
 518     predictor_pair = s->c_predictor_table[index]; \
 519     horiz_pred += (predictor_pair >> 1); \
 520     if (predictor_pair & 1) { \
 521         GET_NEXT_INDEX() \
 522         if (!index) { \
 523             GET_NEXT_INDEX() \
 524             predictor_pair = s->c_predictor_table[index]; \
 525             horiz_pred += ((predictor_pair >> 1) * 5); \
 526             if (predictor_pair & 1) \
 527                 GET_NEXT_INDEX() \
 528             else \
 529                 index++; \
 530         } \
 531     } else \
 532         index++;
 533
 534 #define APPLY_C_PREDICTOR_24() \
 535     predictor_pair = s->c_predictor_table[index]; \
 536     c_horiz_pred += (predictor_pair >> 1); \
 537     if (predictor_pair & 1) { \
 538         GET_NEXT_INDEX() \
 539         if (!index) { \
 540             GET_NEXT_INDEX() \
 541             predictor_pair = s->fat_c_predictor_table[index]; \
 542             c_horiz_pred += (predictor_pair >> 1); \
 543             if (predictor_pair & 1) \
 544                 GET_NEXT_INDEX() \
 545             else \
 546                 index++; \
 547         } \
 548     } else \
 549         index++;
 550 //    c_last+coff = clast+c_horiz_pred;
 551
 552
 553 #define APPLY_Y_PREDICTOR() \
 554     predictor_pair = s->y_predictor_table[index]; \
 555     horiz_pred += (predictor_pair >> 1); \
 556     if (predictor_pair & 1) { \
 557         GET_NEXT_INDEX() \
 558         if (!index) { \
 559             GET_NEXT_INDEX() \
 560             predictor_pair = s->y_predictor_table[index]; \
 561             horiz_pred += ((predictor_pair >> 1) * 5); \
 562             if (predictor_pair & 1) \
 563                 GET_NEXT_INDEX() \
 564             else \
 565                 index++; \
 566         } \
 567     } else \
 568         index++;
 569
 570 #define APPLY_Y_PREDICTOR_24() \
 571     predictor_pair = s->y_predictor_table[index]; \
 572     horiz_pred += (predictor_pair >> 1); \
 573     if (predictor_pair & 1) { \
 574         GET_NEXT_INDEX() \
 575         if (!index) { \
 576             GET_NEXT_INDEX() \
 577             predictor_pair = s->fat_y_predictor_table[index]; \
 578             horiz_pred += (predictor_pair >> 1); \
 579             if (predictor_pair & 1) \
 580                 GET_NEXT_INDEX() \
 581             else \
 582                 index++; \
 583         } \
 584     } else \
 585         index++;
 586
 587 #define OUTPUT_PIXEL_PAIR() \
 588     *current_pixel_pair = *vert_pred + horiz_pred; \
 589     *vert_pred++ = *current_pixel_pair++; \
 590     prev_pixel_pair++;
 591
 592 static void truemotion1_decode_16bit(TrueMotion1Context *s)
 593 {
 594     int y;
 595     int pixels_left;  /* remaining pixels on this line */
 596     unsigned int predictor_pair;
 597     unsigned int horiz_pred;
 598     unsigned int *vert_pred;
 599     unsigned int *current_pixel_pair;
 600     unsigned int *prev_pixel_pair;
 601     unsigned char *current_line = s->frame.data[0];
 602     unsigned char *prev_line = s->prev_frame.data[0];
 603     int keyframe = s->flags & FLAG_KEYFRAME;
 604
 605     /* these variables are for managing the stream of macroblock change bits */
 606     unsigned char *mb_change_bits = s->mb_change_bits;
 607     unsigned char mb_change_byte;
 608     unsigned char mb_change_byte_mask;
 609     int mb_change_index;
 610
 611     /* these variables are for managing the main index stream */
 612     int index_stream_index = 0;  /* yes, the index into the index stream */
 613     int index;
 614
 615     /* clean out the line buffer */
 616     memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned short));
 617
 618     GET_NEXT_INDEX();
 619
 620     for (y = 0; y < s->avctx->height; y++) {
 621
 622         /* re-init variables for the next line iteration */
 623         horiz_pred = 0;
 624         current_pixel_pair = (unsigned int *)current_line;
 625         prev_pixel_pair = (unsigned int *)prev_line;
 626         vert_pred = s->vert_pred;
 627         mb_change_index = 0;
 628         mb_change_byte = mb_change_bits[mb_change_index++];
 629         mb_change_byte_mask = 0x01;
 630         pixels_left = s->avctx->width;
 631
 632         while (pixels_left > 0) {
 633
 634             if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
 635
 636                 switch (y & 3) {
 637                 case 0:
 638                     /* if macroblock width is 2, apply C-Y-C-Y; else
 639                      * apply C-Y-Y */
 640                     if (s->block_width == 2) {
 641                         APPLY_C_PREDICTOR();
 642                         APPLY_Y_PREDICTOR();
 643                         OUTPUT_PIXEL_PAIR();
 644                         APPLY_C_PREDICTOR();
 645                         APPLY_Y_PREDICTOR();
 646                         OUTPUT_PIXEL_PAIR();
 647                     } else {
 648                         APPLY_C_PREDICTOR();
 649                         APPLY_Y_PREDICTOR();
 650                         OUTPUT_PIXEL_PAIR();
 651                         APPLY_Y_PREDICTOR();
 652                         OUTPUT_PIXEL_PAIR();
 653                     }
 654                     break;
 655
 656                 case 1:
 657                 case 3:
 658                     /* always apply 2 Y predictors on these iterations */
 659                     APPLY_Y_PREDICTOR();
 660                     OUTPUT_PIXEL_PAIR();
 661                     APPLY_Y_PREDICTOR();
 662                     OUTPUT_PIXEL_PAIR();
 663                     break;
 664
 665                 case 2:
 666                     /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
 667                      * depending on the macroblock type */
 668                     if (s->block_type == BLOCK_2x2) {
 669                         APPLY_C_PREDICTOR();
 670                         APPLY_Y_PREDICTOR();
 671                         OUTPUT_PIXEL_PAIR();
 672                         APPLY_C_PREDICTOR();
 673                         APPLY_Y_PREDICTOR();
 674                         OUTPUT_PIXEL_PAIR();
 675                     } else if (s->block_type == BLOCK_4x2) {
 676                         APPLY_C_PREDICTOR();
 677                         APPLY_Y_PREDICTOR();
 678                         OUTPUT_PIXEL_PAIR();
 679                         APPLY_Y_PREDICTOR();
 680                         OUTPUT_PIXEL_PAIR();
 681                     } else {
 682                         APPLY_Y_PREDICTOR();
 683                         OUTPUT_PIXEL_PAIR();
 684                         APPLY_Y_PREDICTOR();
 685                         OUTPUT_PIXEL_PAIR();
 686                     }
 687                     break;
 688                 }
 689
 690             } else {
 691
 692                 /* skip (copy) four pixels, but reassign the horizontal
 693                  * predictor */
 694                 *current_pixel_pair = *prev_pixel_pair++;
 695                 *vert_pred++ = *current_pixel_pair++;
 696                 *current_pixel_pair = *prev_pixel_pair++;
 697                 horiz_pred = *current_pixel_pair - *vert_pred;
 698                 *vert_pred++ = *current_pixel_pair++;
 699
 700             }
 701
 702             if (!keyframe) {
 703                 mb_change_byte_mask <<= 1;
 704
 705                 /* next byte */
 706                 if (!mb_change_byte_mask) {
 707                     mb_change_byte = mb_change_bits[mb_change_index++];
 708                     mb_change_byte_mask = 0x01;
 709                 }
 710             }
 711
 712             pixels_left -= 4;
 713         }
 714
 715         /* next change row */
 716         if (((y + 1) & 3) == 0)
 717             mb_change_bits += s->mb_change_bits_row_size;
 718
 719         current_line += s->frame.linesize[0];
 720         prev_line += s->prev_frame.linesize[0];
 721     }
 722 }
 723
 724 static void truemotion1_decode_24bit(TrueMotion1Context *s)
 725 {
 726     int y;
 727     int pixels_left;  /* remaining pixels on this line */
 728     unsigned int predictor_pair;
 729     unsigned int horiz_pred;
 730     unsigned int c_horiz_pred;
 731     unsigned int *vert_pred;
 732     unsigned int *current_pixel_pair;
 733     unsigned int *prev_pixel_pair;
 734     unsigned char *current_line = s->frame.data[0];
 735     unsigned char *prev_line = s->prev_frame.data[0];
 736     int keyframe = s->flags & FLAG_KEYFRAME;
 737
 738     /* these variables are for managing the stream of macroblock change bits */
 739     unsigned char *mb_change_bits = s->mb_change_bits;
 740     unsigned char mb_change_byte;
 741     unsigned char mb_change_byte_mask;
 742     int mb_change_index;
 743
 744     /* these variables are for managing the main index stream */
 745     int index_stream_index = 0;  /* yes, the index into the index stream */
 746     int index;
 747
 748     /* clean out the line buffer */
 749     memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned short));
 750
 751     GET_NEXT_INDEX();
 752
 753     for (y = 0; y < s->avctx->height; y++) {
 754
 755         /* re-init variables for the next line iteration */
 756         horiz_pred = c_horiz_pred = 0;
 757         current_pixel_pair = (unsigned int *)current_line;
 758         prev_pixel_pair = (unsigned int *)prev_line;
 759         vert_pred = s->vert_pred;
 760         mb_change_index = 0;
 761         mb_change_byte = mb_change_bits[mb_change_index++];
 762         mb_change_byte_mask = 0x01;
 763         pixels_left = s->avctx->width;
 764
 765         while (pixels_left > 0) {
 766
 767             if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
 768
 769                 switch (y & 3) {
 770                 case 0:
 771                     /* if macroblock width is 2, apply C-Y-C-Y; else
 772                      * apply C-Y-Y */
 773                     if (s->block_width == 2) {
 774                         APPLY_C_PREDICTOR_24();
 775                         APPLY_Y_PREDICTOR_24();
 776                         OUTPUT_PIXEL_PAIR();
 777 //                        OUTPUT_PIXEL_PAIR_24_C();
 778                         APPLY_C_PREDICTOR_24();
 779                         APPLY_Y_PREDICTOR_24();
 780                         OUTPUT_PIXEL_PAIR();
 781 //                        OUTPUT_PIXEL_PAIR_24_C();
 782                     } else {
 783                         APPLY_C_PREDICTOR_24();
 784                         APPLY_Y_PREDICTOR_24();
 785                         OUTPUT_PIXEL_PAIR();
 786 //                        OUTPUT_PIXEL_PAIR_24_C();
 787                         APPLY_Y_PREDICTOR_24();
 788                         OUTPUT_PIXEL_PAIR();
 789 //                        OUTPUT_PIXEL_PAIR_24_C();
 790                     }
 791                     break;
 792
 793                 case 1:
 794                 case 3:
 795                     /* always apply 2 Y predictors on these iterations */
 796                     APPLY_Y_PREDICTOR_24();
 797                     OUTPUT_PIXEL_PAIR();
 798                     APPLY_Y_PREDICTOR_24();
 799                     OUTPUT_PIXEL_PAIR();
 800                     break;
 801
 802                 case 2:
 803                     /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
 804                      * depending on the macroblock type */
 805                     if (s->block_type == BLOCK_2x2) {
 806                         APPLY_C_PREDICTOR_24();
 807                         APPLY_Y_PREDICTOR_24();
 808                         OUTPUT_PIXEL_PAIR();
 809 //                        OUTPUT_PIXEL_PAIR_24_C();
 810                         APPLY_C_PREDICTOR_24();
 811                         APPLY_Y_PREDICTOR_24();
 812                         OUTPUT_PIXEL_PAIR();
 813 //                        OUTPUT_PIXEL_PAIR_24_C();
 814                     } else if (s->block_type == BLOCK_4x2) {
 815                         APPLY_C_PREDICTOR_24();
 816                         APPLY_Y_PREDICTOR_24();
 817                         OUTPUT_PIXEL_PAIR();
 818 //                        OUTPUT_PIXEL_PAIR_24_C();
 819                         APPLY_Y_PREDICTOR_24();
 820                         OUTPUT_PIXEL_PAIR();
 821 //                        OUTPUT_PIXEL_PAIR_24_C();
 822                     } else {
 823                         APPLY_Y_PREDICTOR_24();
 824                         OUTPUT_PIXEL_PAIR();
 825                         APPLY_Y_PREDICTOR_24();
 826                         OUTPUT_PIXEL_PAIR();
 827                     }
 828                     break;
 829                 }
 830
 831             } else {
 832
 833                 /* skip (copy) four pixels, but reassign the horizontal
 834                  * predictor */
 835                 *current_pixel_pair = *prev_pixel_pair++;
 836                 *vert_pred++ = *current_pixel_pair++;
 837                 *current_pixel_pair = *prev_pixel_pair++;
 838                 horiz_pred = *current_pixel_pair - *vert_pred;
 839 //              c_horiz_pred = *current_pixel_pair - *vert_pred;
 840                 *vert_pred++ = *current_pixel_pair++;
 841
 842             }
 843
 844             if (!keyframe) {
 845                 mb_change_byte_mask <<= 1;
 846
 847                 /* next byte */
 848                 if (!mb_change_byte_mask) {
 849                     mb_change_byte = mb_change_bits[mb_change_index++];
 850                     mb_change_byte_mask = 0x01;
 851                 }
 852             }
 853
 854             pixels_left -= 4;
 855         }
 856
 857         /* next change row */
 858         if (((y + 1) & 3) == 0)
 859             mb_change_bits += s->mb_change_bits_row_size;
 860
 861         current_line += s->frame.linesize[0];
 862         prev_line += s->prev_frame.linesize[0];
 863     }
 864 }
 865
 866
 867 static int truemotion1_decode_frame(AVCodecContext *avctx,
 868                                     void *data, int *data_size,
 869                                     uint8_t *buf, int buf_size)
 870 {
 871     TrueMotion1Context *s = (TrueMotion1Context *)avctx->priv_data;
 872
 873     s->buf = buf;
 874     s->size = buf_size;
 875
 876     if (truemotion1_decode_header(s) == -1)
 877         return -1;
 878
 879     s->frame.reference = 1;
 880     if (avctx->get_buffer(avctx, &s->frame) < 0) {
 881         av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 882         return -1;
 883     }
 884
 885     /* check for a do-nothing frame and copy the previous frame */
 886     if (compression_types[s->compression].algorithm == ALGO_NOP)
 887     {
 888         memcpy(s->frame.data[0], s->prev_frame.data[0],
 889             s->frame.linesize[0] * s->avctx->height);
 890     } else if (compression_types[s->compression].algorithm == ALGO_RGB24H) {
 891         truemotion1_decode_24bit(s);
 892     } else {
 893         truemotion1_decode_16bit(s);
 894     }
 895
 896     if (s->prev_frame.data[0])
 897         avctx->release_buffer(avctx, &s->prev_frame);
 898
 899     /* shuffle frames */
 900     s->prev_frame = s->frame;
 901
 902     *data_size = sizeof(AVFrame);
 903     *(AVFrame*)data = s->frame;
 904
 905     /* report that the buffer was completely consumed */
 906     return buf_size;
 907 }
 908
 909 static int truemotion1_decode_end(AVCodecContext *avctx)
 910 {
 911     TrueMotion1Context *s = (TrueMotion1Context *)avctx->priv_data;
 912
 913     /* release the last frame */
 914     if (s->prev_frame.data[0])
 915         avctx->release_buffer(avctx, &s->prev_frame);
 916
 917     av_free(s->vert_pred);
 918
 919     return 0;
 920 }
 921
 922 AVCodec truemotion1_decoder = {
 923     "truemotion1",
 924     CODEC_TYPE_VIDEO,
 925     CODEC_ID_TRUEMOTION1,
 926     sizeof(TrueMotion1Context),
 927     truemotion1_decode_init,
 928     NULL,
 929     truemotion1_decode_end,
 930     truemotion1_decode_frame,
 931     CODEC_CAP_DR1,
 932 };