truemotion1.c
Go to the documentation of this file.
1 /*
2  * Duck TrueMotion 1.0 Decoder
3  * Copyright (C) 2003 Alex Beregszaszi & Mike Melanson
4  *
5  * This file is part of Libav.
6  *
7  * Libav is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * Libav is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <string.h>
35 
36 #include "avcodec.h"
37 #include "dsputil.h"
38 #include "libavutil/imgutils.h"
39 #include "libavutil/internal.h"
40 #include "libavutil/mem.h"
41 
42 #include "truemotion1data.h"
43 
44 typedef struct TrueMotion1Context {
47 
48  const uint8_t *buf;
49  int size;
50 
55 
56  int flags;
57  int x, y, w, h;
58 
59  uint32_t y_predictor_table[1024];
60  uint32_t c_predictor_table[1024];
61  uint32_t fat_y_predictor_table[1024];
62  uint32_t fat_c_predictor_table[1024];
63 
68 
69  int16_t ydt[8];
70  int16_t cdt[8];
71  int16_t fat_ydt[8];
72  int16_t fat_cdt[8];
73 
75 
76  unsigned int *vert_pred;
78 
80 
81 #define FLAG_SPRITE 32
82 #define FLAG_KEYFRAME 16
83 #define FLAG_INTERFRAME 8
84 #define FLAG_INTERPOLATED 4
85 
86 struct frame_header {
91  uint16_t ysize;
92  uint16_t xsize;
93  uint16_t checksum;
98  uint16_t xoffset;
99  uint16_t yoffset;
100  uint16_t width;
101  uint16_t height;
102 };
103 
104 #define ALGO_NOP 0
105 #define ALGO_RGB16V 1
106 #define ALGO_RGB16H 2
107 #define ALGO_RGB24H 3
108 
109 /* these are the various block sizes that can occupy a 4x4 block */
110 #define BLOCK_2x2 0
111 #define BLOCK_2x4 1
112 #define BLOCK_4x2 2
113 #define BLOCK_4x4 3
114 
115 typedef struct comp_types {
117  int block_width; // vres
118  int block_height; // hres
120 } comp_types;
121 
122 /* { valid for metatype }, algorithm, num of deltas, vert res, horiz res */
123 static const comp_types compression_types[17] = {
124  { ALGO_NOP, 0, 0, 0 },
125 
126  { ALGO_RGB16V, 4, 4, BLOCK_4x4 },
127  { ALGO_RGB16H, 4, 4, BLOCK_4x4 },
128  { ALGO_RGB16V, 4, 2, BLOCK_4x2 },
129  { ALGO_RGB16H, 4, 2, BLOCK_4x2 },
130 
131  { ALGO_RGB16V, 2, 4, BLOCK_2x4 },
132  { ALGO_RGB16H, 2, 4, BLOCK_2x4 },
133  { ALGO_RGB16V, 2, 2, BLOCK_2x2 },
134  { ALGO_RGB16H, 2, 2, BLOCK_2x2 },
135 
136  { ALGO_NOP, 4, 4, BLOCK_4x4 },
137  { ALGO_RGB24H, 4, 4, BLOCK_4x4 },
138  { ALGO_NOP, 4, 2, BLOCK_4x2 },
139  { ALGO_RGB24H, 4, 2, BLOCK_4x2 },
140 
141  { ALGO_NOP, 2, 4, BLOCK_2x4 },
142  { ALGO_RGB24H, 2, 4, BLOCK_2x4 },
143  { ALGO_NOP, 2, 2, BLOCK_2x2 },
144  { ALGO_RGB24H, 2, 2, BLOCK_2x2 }
145 };
146 
147 static void select_delta_tables(TrueMotion1Context *s, int delta_table_index)
148 {
149  int i;
150 
151  if (delta_table_index > 3)
152  return;
153 
154  memcpy(s->ydt, ydts[delta_table_index], 8 * sizeof(int16_t));
155  memcpy(s->cdt, cdts[delta_table_index], 8 * sizeof(int16_t));
156  memcpy(s->fat_ydt, fat_ydts[delta_table_index], 8 * sizeof(int16_t));
157  memcpy(s->fat_cdt, fat_cdts[delta_table_index], 8 * sizeof(int16_t));
158 
159  /* Y skinny deltas need to be halved for some reason; maybe the
160  * skinny Y deltas should be modified */
161  for (i = 0; i < 8; i++)
162  {
163  /* drop the lsb before dividing by 2-- net effect: round down
164  * when dividing a negative number (e.g., -3/2 = -2, not -1) */
165  s->ydt[i] &= 0xFFFE;
166  s->ydt[i] /= 2;
167  }
168 }
169 
170 #if HAVE_BIGENDIAN
171 static int make_ydt15_entry(int p2, int p1, int16_t *ydt)
172 #else
173 static int make_ydt15_entry(int p1, int p2, int16_t *ydt)
174 #endif
175 {
176  int lo, hi;
177 
178  lo = ydt[p1];
179  lo += (lo << 5) + (lo << 10);
180  hi = ydt[p2];
181  hi += (hi << 5) + (hi << 10);
182  return (lo + (hi << 16)) << 1;
183 }
184 
185 static int make_cdt15_entry(int p1, int p2, int16_t *cdt)
186 {
187  int r, b, lo;
188 
189  b = cdt[p2];
190  r = cdt[p1] << 10;
191  lo = b + r;
192  return (lo + (lo << 16)) << 1;
193 }
194 
195 #if HAVE_BIGENDIAN
196 static int make_ydt16_entry(int p2, int p1, int16_t *ydt)
197 #else
198 static int make_ydt16_entry(int p1, int p2, int16_t *ydt)
199 #endif
200 {
201  int lo, hi;
202 
203  lo = ydt[p1];
204  lo += (lo << 6) + (lo << 11);
205  hi = ydt[p2];
206  hi += (hi << 6) + (hi << 11);
207  return (lo + (hi << 16)) << 1;
208 }
209 
210 static int make_cdt16_entry(int p1, int p2, int16_t *cdt)
211 {
212  int r, b, lo;
213 
214  b = cdt[p2];
215  r = cdt[p1] << 11;
216  lo = b + r;
217  return (lo + (lo << 16)) << 1;
218 }
219 
220 static int make_ydt24_entry(int p1, int p2, int16_t *ydt)
221 {
222  int lo, hi;
223 
224  lo = ydt[p1];
225  hi = ydt[p2];
226  return (lo + (hi << 8) + (hi << 16)) << 1;
227 }
228 
229 static int make_cdt24_entry(int p1, int p2, int16_t *cdt)
230 {
231  int r, b;
232 
233  b = cdt[p2];
234  r = cdt[p1]<<16;
235  return (b+r) << 1;
236 }
237 
238 static void gen_vector_table15(TrueMotion1Context *s, const uint8_t *sel_vector_table)
239 {
240  int len, i, j;
241  unsigned char delta_pair;
242 
243  for (i = 0; i < 1024; i += 4)
244  {
245  len = *sel_vector_table++ / 2;
246  for (j = 0; j < len; j++)
247  {
248  delta_pair = *sel_vector_table++;
249  s->y_predictor_table[i+j] = 0xfffffffe &
250  make_ydt15_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
251  s->c_predictor_table[i+j] = 0xfffffffe &
252  make_cdt15_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
253  }
254  s->y_predictor_table[i+(j-1)] |= 1;
255  s->c_predictor_table[i+(j-1)] |= 1;
256  }
257 }
258 
259 static void gen_vector_table16(TrueMotion1Context *s, const uint8_t *sel_vector_table)
260 {
261  int len, i, j;
262  unsigned char delta_pair;
263 
264  for (i = 0; i < 1024; i += 4)
265  {
266  len = *sel_vector_table++ / 2;
267  for (j = 0; j < len; j++)
268  {
269  delta_pair = *sel_vector_table++;
270  s->y_predictor_table[i+j] = 0xfffffffe &
271  make_ydt16_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
272  s->c_predictor_table[i+j] = 0xfffffffe &
273  make_cdt16_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
274  }
275  s->y_predictor_table[i+(j-1)] |= 1;
276  s->c_predictor_table[i+(j-1)] |= 1;
277  }
278 }
279 
280 static void gen_vector_table24(TrueMotion1Context *s, const uint8_t *sel_vector_table)
281 {
282  int len, i, j;
283  unsigned char delta_pair;
284 
285  for (i = 0; i < 1024; i += 4)
286  {
287  len = *sel_vector_table++ / 2;
288  for (j = 0; j < len; j++)
289  {
290  delta_pair = *sel_vector_table++;
291  s->y_predictor_table[i+j] = 0xfffffffe &
292  make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
293  s->c_predictor_table[i+j] = 0xfffffffe &
294  make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
295  s->fat_y_predictor_table[i+j] = 0xfffffffe &
296  make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_ydt);
297  s->fat_c_predictor_table[i+j] = 0xfffffffe &
298  make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_cdt);
299  }
300  s->y_predictor_table[i+(j-1)] |= 1;
301  s->c_predictor_table[i+(j-1)] |= 1;
302  s->fat_y_predictor_table[i+(j-1)] |= 1;
303  s->fat_c_predictor_table[i+(j-1)] |= 1;
304  }
305 }
306 
307 /* Returns the number of bytes consumed from the bytestream. Returns -1 if
308  * there was an error while decoding the header */
310 {
311  int i;
312  int width_shift = 0;
313  int new_pix_fmt;
314  struct frame_header header;
315  uint8_t header_buffer[128] = { 0 }; /* logical maximum size of the header */
316  const uint8_t *sel_vector_table;
317 
318  header.header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f;
319  if (s->buf[0] < 0x10)
320  {
321  av_log(s->avctx, AV_LOG_ERROR, "invalid header size (%d)\n", s->buf[0]);
322  return -1;
323  }
324 
325  /* unscramble the header bytes with a XOR operation */
326  for (i = 1; i < header.header_size; i++)
327  header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1];
328 
329  header.compression = header_buffer[0];
330  header.deltaset = header_buffer[1];
331  header.vectable = header_buffer[2];
332  header.ysize = AV_RL16(&header_buffer[3]);
333  header.xsize = AV_RL16(&header_buffer[5]);
334  header.checksum = AV_RL16(&header_buffer[7]);
335  header.version = header_buffer[9];
336  header.header_type = header_buffer[10];
337  header.flags = header_buffer[11];
338  header.control = header_buffer[12];
339 
340  /* Version 2 */
341  if (header.version >= 2)
342  {
343  if (header.header_type > 3)
344  {
345  av_log(s->avctx, AV_LOG_ERROR, "invalid header type (%d)\n", header.header_type);
346  return -1;
347  } else if ((header.header_type == 2) || (header.header_type == 3)) {
348  s->flags = header.flags;
349  if (!(s->flags & FLAG_INTERFRAME))
350  s->flags |= FLAG_KEYFRAME;
351  } else
352  s->flags = FLAG_KEYFRAME;
353  } else /* Version 1 */
354  s->flags = FLAG_KEYFRAME;
355 
356  if (s->flags & FLAG_SPRITE) {
357  av_log_ask_for_sample(s->avctx, "SPRITE frame found.\n");
358  /* FIXME header.width, height, xoffset and yoffset aren't initialized */
359  return AVERROR_PATCHWELCOME;
360  } else {
361  s->w = header.xsize;
362  s->h = header.ysize;
363  if (header.header_type < 2) {
364  if ((s->w < 213) && (s->h >= 176))
365  {
366  s->flags |= FLAG_INTERPOLATED;
367  av_log_ask_for_sample(s->avctx, "INTERPOLATION selected.\n");
368  }
369  }
370  }
371 
372  if (header.compression >= 17) {
373  av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression);
374  return -1;
375  }
376 
377  if ((header.deltaset != s->last_deltaset) ||
378  (header.vectable != s->last_vectable))
379  select_delta_tables(s, header.deltaset);
380 
381  if ((header.compression & 1) && header.header_type)
382  sel_vector_table = pc_tbl2;
383  else {
384  if (header.vectable > 0 && header.vectable < 4)
385  sel_vector_table = tables[header.vectable - 1];
386  else {
387  av_log(s->avctx, AV_LOG_ERROR, "invalid vector table id (%d)\n", header.vectable);
388  return -1;
389  }
390  }
391 
392  if (compression_types[header.compression].algorithm == ALGO_RGB24H) {
393  new_pix_fmt = AV_PIX_FMT_RGB32;
394  width_shift = 1;
395  } else
396  new_pix_fmt = AV_PIX_FMT_RGB555; // RGB565 is supported as well
397 
398  s->w >>= width_shift;
399  if (av_image_check_size(s->w, s->h, 0, s->avctx) < 0)
400  return -1;
401 
402  if (s->w != s->avctx->width || s->h != s->avctx->height ||
403  new_pix_fmt != s->avctx->pix_fmt) {
404  if (s->frame.data[0])
405  s->avctx->release_buffer(s->avctx, &s->frame);
406  s->avctx->sample_aspect_ratio = (AVRational){ 1 << width_shift, 1 };
407  s->avctx->pix_fmt = new_pix_fmt;
408  avcodec_set_dimensions(s->avctx, s->w, s->h);
409  av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
410  }
411 
412  /* There is 1 change bit per 4 pixels, so each change byte represents
413  * 32 pixels; divide width by 4 to obtain the number of change bits and
414  * then round up to the nearest byte. */
415  s->mb_change_bits_row_size = ((s->avctx->width >> (2 - width_shift)) + 7) >> 3;
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 == AV_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 */
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",
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 
460 {
461  TrueMotion1Context *s = 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 = AV_PIX_FMT_RGB24;
468 // else
469 // avctx->pix_fmt = AV_PIX_FMT_RGB555;
470 
471  s->frame.data[0] = NULL;
472 
473  /* there is a vertical predictor for each pixel in a line; each vertical
474  * predictor is 0 to start with */
475  av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
476 
477  return 0;
478 }
479 
480 /*
481 Block decoding order:
482 
483 dxi: Y-Y
484 dxic: Y-C-Y
485 dxic2: Y-C-Y-C
486 
487 hres,vres,i,i%vres (0 < i < 4)
488 2x2 0: 0 dxic2
489 2x2 1: 1 dxi
490 2x2 2: 0 dxic2
491 2x2 3: 1 dxi
492 2x4 0: 0 dxic2
493 2x4 1: 1 dxi
494 2x4 2: 2 dxi
495 2x4 3: 3 dxi
496 4x2 0: 0 dxic
497 4x2 1: 1 dxi
498 4x2 2: 0 dxic
499 4x2 3: 1 dxi
500 4x4 0: 0 dxic
501 4x4 1: 1 dxi
502 4x4 2: 2 dxi
503 4x4 3: 3 dxi
504 */
505 
506 #define GET_NEXT_INDEX() \
507 {\
508  if (index_stream_index >= s->index_stream_size) { \
509  av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \
510  return; \
511  } \
512  index = s->index_stream[index_stream_index++] * 4; \
513 }
514 
515 #define APPLY_C_PREDICTOR() \
516  predictor_pair = s->c_predictor_table[index]; \
517  horiz_pred += (predictor_pair >> 1); \
518  if (predictor_pair & 1) { \
519  GET_NEXT_INDEX() \
520  if (!index) { \
521  GET_NEXT_INDEX() \
522  predictor_pair = s->c_predictor_table[index]; \
523  horiz_pred += ((predictor_pair >> 1) * 5); \
524  if (predictor_pair & 1) \
525  GET_NEXT_INDEX() \
526  else \
527  index++; \
528  } \
529  } else \
530  index++;
531 
532 #define APPLY_C_PREDICTOR_24() \
533  predictor_pair = s->c_predictor_table[index]; \
534  horiz_pred += (predictor_pair >> 1); \
535  if (predictor_pair & 1) { \
536  GET_NEXT_INDEX() \
537  if (!index) { \
538  GET_NEXT_INDEX() \
539  predictor_pair = s->fat_c_predictor_table[index]; \
540  horiz_pred += (predictor_pair >> 1); \
541  if (predictor_pair & 1) \
542  GET_NEXT_INDEX() \
543  else \
544  index++; \
545  } \
546  } else \
547  index++;
548 
549 
550 #define APPLY_Y_PREDICTOR() \
551  predictor_pair = s->y_predictor_table[index]; \
552  horiz_pred += (predictor_pair >> 1); \
553  if (predictor_pair & 1) { \
554  GET_NEXT_INDEX() \
555  if (!index) { \
556  GET_NEXT_INDEX() \
557  predictor_pair = s->y_predictor_table[index]; \
558  horiz_pred += ((predictor_pair >> 1) * 5); \
559  if (predictor_pair & 1) \
560  GET_NEXT_INDEX() \
561  else \
562  index++; \
563  } \
564  } else \
565  index++;
566 
567 #define APPLY_Y_PREDICTOR_24() \
568  predictor_pair = s->y_predictor_table[index]; \
569  horiz_pred += (predictor_pair >> 1); \
570  if (predictor_pair & 1) { \
571  GET_NEXT_INDEX() \
572  if (!index) { \
573  GET_NEXT_INDEX() \
574  predictor_pair = s->fat_y_predictor_table[index]; \
575  horiz_pred += (predictor_pair >> 1); \
576  if (predictor_pair & 1) \
577  GET_NEXT_INDEX() \
578  else \
579  index++; \
580  } \
581  } else \
582  index++;
583 
584 #define OUTPUT_PIXEL_PAIR() \
585  *current_pixel_pair = *vert_pred + horiz_pred; \
586  *vert_pred++ = *current_pixel_pair++;
587 
589 {
590  int y;
591  int pixels_left; /* remaining pixels on this line */
592  unsigned int predictor_pair;
593  unsigned int horiz_pred;
594  unsigned int *vert_pred;
595  unsigned int *current_pixel_pair;
596  unsigned char *current_line = s->frame.data[0];
597  int keyframe = s->flags & FLAG_KEYFRAME;
598 
599  /* these variables are for managing the stream of macroblock change bits */
600  const unsigned char *mb_change_bits = s->mb_change_bits;
601  unsigned char mb_change_byte;
602  unsigned char mb_change_byte_mask;
603  int mb_change_index;
604 
605  /* these variables are for managing the main index stream */
606  int index_stream_index = 0; /* yes, the index into the index stream */
607  int index;
608 
609  /* clean out the line buffer */
610  memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
611 
612  GET_NEXT_INDEX();
613 
614  for (y = 0; y < s->avctx->height; y++) {
615 
616  /* re-init variables for the next line iteration */
617  horiz_pred = 0;
618  current_pixel_pair = (unsigned int *)current_line;
619  vert_pred = s->vert_pred;
620  mb_change_index = 0;
621  mb_change_byte = mb_change_bits[mb_change_index++];
622  mb_change_byte_mask = 0x01;
623  pixels_left = s->avctx->width;
624 
625  while (pixels_left > 0) {
626 
627  if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
628 
629  switch (y & 3) {
630  case 0:
631  /* if macroblock width is 2, apply C-Y-C-Y; else
632  * apply C-Y-Y */
633  if (s->block_width == 2) {
640  } else {
646  }
647  break;
648 
649  case 1:
650  case 3:
651  /* always apply 2 Y predictors on these iterations */
656  break;
657 
658  case 2:
659  /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
660  * depending on the macroblock type */
661  if (s->block_type == BLOCK_2x2) {
668  } else if (s->block_type == BLOCK_4x2) {
674  } else {
679  }
680  break;
681  }
682 
683  } else {
684 
685  /* skip (copy) four pixels, but reassign the horizontal
686  * predictor */
687  *vert_pred++ = *current_pixel_pair++;
688  horiz_pred = *current_pixel_pair - *vert_pred;
689  *vert_pred++ = *current_pixel_pair++;
690 
691  }
692 
693  if (!keyframe) {
694  mb_change_byte_mask <<= 1;
695 
696  /* next byte */
697  if (!mb_change_byte_mask) {
698  mb_change_byte = mb_change_bits[mb_change_index++];
699  mb_change_byte_mask = 0x01;
700  }
701  }
702 
703  pixels_left -= 4;
704  }
705 
706  /* next change row */
707  if (((y + 1) & 3) == 0)
708  mb_change_bits += s->mb_change_bits_row_size;
709 
710  current_line += s->frame.linesize[0];
711  }
712 }
713 
715 {
716  int y;
717  int pixels_left; /* remaining pixels on this line */
718  unsigned int predictor_pair;
719  unsigned int horiz_pred;
720  unsigned int *vert_pred;
721  unsigned int *current_pixel_pair;
722  unsigned char *current_line = s->frame.data[0];
723  int keyframe = s->flags & FLAG_KEYFRAME;
724 
725  /* these variables are for managing the stream of macroblock change bits */
726  const unsigned char *mb_change_bits = s->mb_change_bits;
727  unsigned char mb_change_byte;
728  unsigned char mb_change_byte_mask;
729  int mb_change_index;
730 
731  /* these variables are for managing the main index stream */
732  int index_stream_index = 0; /* yes, the index into the index stream */
733  int index;
734 
735  /* clean out the line buffer */
736  memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
737 
738  GET_NEXT_INDEX();
739 
740  for (y = 0; y < s->avctx->height; y++) {
741 
742  /* re-init variables for the next line iteration */
743  horiz_pred = 0;
744  current_pixel_pair = (unsigned int *)current_line;
745  vert_pred = s->vert_pred;
746  mb_change_index = 0;
747  mb_change_byte = mb_change_bits[mb_change_index++];
748  mb_change_byte_mask = 0x01;
749  pixels_left = s->avctx->width;
750 
751  while (pixels_left > 0) {
752 
753  if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
754 
755  switch (y & 3) {
756  case 0:
757  /* if macroblock width is 2, apply C-Y-C-Y; else
758  * apply C-Y-Y */
759  if (s->block_width == 2) {
766  } else {
772  }
773  break;
774 
775  case 1:
776  case 3:
777  /* always apply 2 Y predictors on these iterations */
782  break;
783 
784  case 2:
785  /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
786  * depending on the macroblock type */
787  if (s->block_type == BLOCK_2x2) {
794  } else if (s->block_type == BLOCK_4x2) {
800  } else {
805  }
806  break;
807  }
808 
809  } else {
810 
811  /* skip (copy) four pixels, but reassign the horizontal
812  * predictor */
813  *vert_pred++ = *current_pixel_pair++;
814  horiz_pred = *current_pixel_pair - *vert_pred;
815  *vert_pred++ = *current_pixel_pair++;
816 
817  }
818 
819  if (!keyframe) {
820  mb_change_byte_mask <<= 1;
821 
822  /* next byte */
823  if (!mb_change_byte_mask) {
824  mb_change_byte = mb_change_bits[mb_change_index++];
825  mb_change_byte_mask = 0x01;
826  }
827  }
828 
829  pixels_left -= 2;
830  }
831 
832  /* next change row */
833  if (((y + 1) & 3) == 0)
834  mb_change_bits += s->mb_change_bits_row_size;
835 
836  current_line += s->frame.linesize[0];
837  }
838 }
839 
840 
842  void *data, int *got_frame,
843  AVPacket *avpkt)
844 {
845  const uint8_t *buf = avpkt->data;
846  int buf_size = avpkt->size;
847  TrueMotion1Context *s = avctx->priv_data;
848 
849  s->buf = buf;
850  s->size = buf_size;
851 
852  if (truemotion1_decode_header(s) == -1)
853  return -1;
854 
855  s->frame.reference = 1;
858  if (avctx->reget_buffer(avctx, &s->frame) < 0) {
859  av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
860  return -1;
861  }
862 
863  if (compression_types[s->compression].algorithm == ALGO_RGB24H) {
865  } else if (compression_types[s->compression].algorithm != ALGO_NOP) {
867  }
868 
869  *got_frame = 1;
870  *(AVFrame*)data = s->frame;
871 
872  /* report that the buffer was completely consumed */
873  return buf_size;
874 }
875 
877 {
878  TrueMotion1Context *s = avctx->priv_data;
879 
880  if (s->frame.data[0])
881  avctx->release_buffer(avctx, &s->frame);
882 
883  av_free(s->vert_pred);
884 
885  return 0;
886 }
887 
889  .name = "truemotion1",
890  .type = AVMEDIA_TYPE_VIDEO,
892  .priv_data_size = sizeof(TrueMotion1Context),
896  .capabilities = CODEC_CAP_DR1,
897  .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 1.0"),
898 };