truemotion1.c
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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  if (header.header_size + 1 > s->size) {
326  av_log(s->avctx, AV_LOG_ERROR, "Input packet too small.\n");
327  return AVERROR_INVALIDDATA;
328  }
329 
330  /* unscramble the header bytes with a XOR operation */
331  for (i = 1; i < header.header_size; i++)
332  header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1];
333 
334  header.compression = header_buffer[0];
335  header.deltaset = header_buffer[1];
336  header.vectable = header_buffer[2];
337  header.ysize = AV_RL16(&header_buffer[3]);
338  header.xsize = AV_RL16(&header_buffer[5]);
339  header.checksum = AV_RL16(&header_buffer[7]);
340  header.version = header_buffer[9];
341  header.header_type = header_buffer[10];
342  header.flags = header_buffer[11];
343  header.control = header_buffer[12];
344 
345  /* Version 2 */
346  if (header.version >= 2)
347  {
348  if (header.header_type > 3)
349  {
350  av_log(s->avctx, AV_LOG_ERROR, "invalid header type (%d)\n", header.header_type);
351  return -1;
352  } else if ((header.header_type == 2) || (header.header_type == 3)) {
353  s->flags = header.flags;
354  if (!(s->flags & FLAG_INTERFRAME))
355  s->flags |= FLAG_KEYFRAME;
356  } else
357  s->flags = FLAG_KEYFRAME;
358  } else /* Version 1 */
359  s->flags = FLAG_KEYFRAME;
360 
361  if (s->flags & FLAG_SPRITE) {
362  av_log_ask_for_sample(s->avctx, "SPRITE frame found.\n");
363  /* FIXME header.width, height, xoffset and yoffset aren't initialized */
364  return AVERROR_PATCHWELCOME;
365  } else {
366  s->w = header.xsize;
367  s->h = header.ysize;
368  if (header.header_type < 2) {
369  if ((s->w < 213) && (s->h >= 176))
370  {
371  s->flags |= FLAG_INTERPOLATED;
372  av_log_ask_for_sample(s->avctx, "INTERPOLATION selected.\n");
373  }
374  }
375  }
376 
377  if (header.compression >= 17) {
378  av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression);
379  return -1;
380  }
381 
382  if ((header.deltaset != s->last_deltaset) ||
383  (header.vectable != s->last_vectable))
384  select_delta_tables(s, header.deltaset);
385 
386  if ((header.compression & 1) && header.header_type)
387  sel_vector_table = pc_tbl2;
388  else {
389  if (header.vectable > 0 && header.vectable < 4)
390  sel_vector_table = tables[header.vectable - 1];
391  else {
392  av_log(s->avctx, AV_LOG_ERROR, "invalid vector table id (%d)\n", header.vectable);
393  return -1;
394  }
395  }
396 
397  if (compression_types[header.compression].algorithm == ALGO_RGB24H) {
398  new_pix_fmt = AV_PIX_FMT_RGB32;
399  width_shift = 1;
400  } else
401  new_pix_fmt = AV_PIX_FMT_RGB555; // RGB565 is supported as well
402 
403  s->w >>= width_shift;
404  if (av_image_check_size(s->w, s->h, 0, s->avctx) < 0)
405  return -1;
406 
407  if (s->w != s->avctx->width || s->h != s->avctx->height ||
408  new_pix_fmt != s->avctx->pix_fmt) {
409  if (s->frame.data[0])
410  s->avctx->release_buffer(s->avctx, &s->frame);
411  s->avctx->sample_aspect_ratio = (AVRational){ 1 << width_shift, 1 };
412  s->avctx->pix_fmt = new_pix_fmt;
413  avcodec_set_dimensions(s->avctx, s->w, s->h);
414  av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
415  }
416 
417  /* There is 1 change bit per 4 pixels, so each change byte represents
418  * 32 pixels; divide width by 4 to obtain the number of change bits and
419  * then round up to the nearest byte. */
420  s->mb_change_bits_row_size = ((s->avctx->width >> (2 - width_shift)) + 7) >> 3;
421 
422  if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable))
423  {
424  if (compression_types[header.compression].algorithm == ALGO_RGB24H)
425  gen_vector_table24(s, sel_vector_table);
426  else
427  if (s->avctx->pix_fmt == AV_PIX_FMT_RGB555)
428  gen_vector_table15(s, sel_vector_table);
429  else
430  gen_vector_table16(s, sel_vector_table);
431  }
432 
433  /* set up pointers to the other key data chunks */
434  s->mb_change_bits = s->buf + header.header_size;
435  if (s->flags & FLAG_KEYFRAME) {
436  /* no change bits specified for a keyframe; only index bytes */
438  } else {
439  /* one change bit per 4x4 block */
440  s->index_stream = s->mb_change_bits +
441  (s->mb_change_bits_row_size * (s->avctx->height >> 2));
442  }
443  s->index_stream_size = s->size - (s->index_stream - s->buf);
444 
445  s->last_deltaset = header.deltaset;
446  s->last_vectable = header.vectable;
447  s->compression = header.compression;
448  s->block_width = compression_types[header.compression].block_width;
449  s->block_height = compression_types[header.compression].block_height;
450  s->block_type = compression_types[header.compression].block_type;
451 
452  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
453  av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n",
455  s->block_height, s->block_type,
456  s->flags & FLAG_KEYFRAME ? " KEY" : "",
457  s->flags & FLAG_INTERFRAME ? " INTER" : "",
458  s->flags & FLAG_SPRITE ? " SPRITE" : "",
459  s->flags & FLAG_INTERPOLATED ? " INTERPOL" : "");
460 
461  return header.header_size;
462 }
463 
465 {
466  TrueMotion1Context *s = avctx->priv_data;
467 
468  s->avctx = avctx;
469 
470  // FIXME: it may change ?
471 // if (avctx->bits_per_sample == 24)
472 // avctx->pix_fmt = AV_PIX_FMT_RGB24;
473 // else
474 // avctx->pix_fmt = AV_PIX_FMT_RGB555;
475 
476  s->frame.data[0] = NULL;
477 
478  /* there is a vertical predictor for each pixel in a line; each vertical
479  * predictor is 0 to start with */
480  av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
481 
482  return 0;
483 }
484 
485 /*
486 Block decoding order:
487 
488 dxi: Y-Y
489 dxic: Y-C-Y
490 dxic2: Y-C-Y-C
491 
492 hres,vres,i,i%vres (0 < i < 4)
493 2x2 0: 0 dxic2
494 2x2 1: 1 dxi
495 2x2 2: 0 dxic2
496 2x2 3: 1 dxi
497 2x4 0: 0 dxic2
498 2x4 1: 1 dxi
499 2x4 2: 2 dxi
500 2x4 3: 3 dxi
501 4x2 0: 0 dxic
502 4x2 1: 1 dxi
503 4x2 2: 0 dxic
504 4x2 3: 1 dxi
505 4x4 0: 0 dxic
506 4x4 1: 1 dxi
507 4x4 2: 2 dxi
508 4x4 3: 3 dxi
509 */
510 
511 #define GET_NEXT_INDEX() \
512 {\
513  if (index_stream_index >= s->index_stream_size) { \
514  av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \
515  return; \
516  } \
517  index = s->index_stream[index_stream_index++] * 4; \
518 }
519 
520 #define INC_INDEX \
521 do { \
522  if (index >= 1023) { \
523  av_log(s->avctx, AV_LOG_ERROR, "Invalid index value.\n"); \
524  return; \
525  } \
526  index++; \
527 } while (0)
528 
529 #define APPLY_C_PREDICTOR() \
530  predictor_pair = s->c_predictor_table[index]; \
531  horiz_pred += (predictor_pair >> 1); \
532  if (predictor_pair & 1) { \
533  GET_NEXT_INDEX() \
534  if (!index) { \
535  GET_NEXT_INDEX() \
536  predictor_pair = s->c_predictor_table[index]; \
537  horiz_pred += ((predictor_pair >> 1) * 5); \
538  if (predictor_pair & 1) \
539  GET_NEXT_INDEX() \
540  else \
541  INC_INDEX; \
542  } \
543  } else \
544  INC_INDEX;
545 
546 #define APPLY_C_PREDICTOR_24() \
547  predictor_pair = s->c_predictor_table[index]; \
548  horiz_pred += (predictor_pair >> 1); \
549  if (predictor_pair & 1) { \
550  GET_NEXT_INDEX() \
551  if (!index) { \
552  GET_NEXT_INDEX() \
553  predictor_pair = s->fat_c_predictor_table[index]; \
554  horiz_pred += (predictor_pair >> 1); \
555  if (predictor_pair & 1) \
556  GET_NEXT_INDEX() \
557  else \
558  INC_INDEX; \
559  } \
560  } else \
561  INC_INDEX;
562 
563 
564 #define APPLY_Y_PREDICTOR() \
565  predictor_pair = s->y_predictor_table[index]; \
566  horiz_pred += (predictor_pair >> 1); \
567  if (predictor_pair & 1) { \
568  GET_NEXT_INDEX() \
569  if (!index) { \
570  GET_NEXT_INDEX() \
571  predictor_pair = s->y_predictor_table[index]; \
572  horiz_pred += ((predictor_pair >> 1) * 5); \
573  if (predictor_pair & 1) \
574  GET_NEXT_INDEX() \
575  else \
576  INC_INDEX; \
577  } \
578  } else \
579  INC_INDEX;
580 
581 #define APPLY_Y_PREDICTOR_24() \
582  predictor_pair = s->y_predictor_table[index]; \
583  horiz_pred += (predictor_pair >> 1); \
584  if (predictor_pair & 1) { \
585  GET_NEXT_INDEX() \
586  if (!index) { \
587  GET_NEXT_INDEX() \
588  predictor_pair = s->fat_y_predictor_table[index]; \
589  horiz_pred += (predictor_pair >> 1); \
590  if (predictor_pair & 1) \
591  GET_NEXT_INDEX() \
592  else \
593  INC_INDEX; \
594  } \
595  } else \
596  INC_INDEX;
597 
598 #define OUTPUT_PIXEL_PAIR() \
599  *current_pixel_pair = *vert_pred + horiz_pred; \
600  *vert_pred++ = *current_pixel_pair++;
601 
603 {
604  int y;
605  int pixels_left; /* remaining pixels on this line */
606  unsigned int predictor_pair;
607  unsigned int horiz_pred;
608  unsigned int *vert_pred;
609  unsigned int *current_pixel_pair;
610  unsigned char *current_line = s->frame.data[0];
611  int keyframe = s->flags & FLAG_KEYFRAME;
612 
613  /* these variables are for managing the stream of macroblock change bits */
614  const unsigned char *mb_change_bits = s->mb_change_bits;
615  unsigned char mb_change_byte;
616  unsigned char mb_change_byte_mask;
617  int mb_change_index;
618 
619  /* these variables are for managing the main index stream */
620  int index_stream_index = 0; /* yes, the index into the index stream */
621  int index;
622 
623  /* clean out the line buffer */
624  memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
625 
626  GET_NEXT_INDEX();
627 
628  for (y = 0; y < s->avctx->height; y++) {
629 
630  /* re-init variables for the next line iteration */
631  horiz_pred = 0;
632  current_pixel_pair = (unsigned int *)current_line;
633  vert_pred = s->vert_pred;
634  mb_change_index = 0;
635  mb_change_byte = mb_change_bits[mb_change_index++];
636  mb_change_byte_mask = 0x01;
637  pixels_left = s->avctx->width;
638 
639  while (pixels_left > 0) {
640 
641  if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
642 
643  switch (y & 3) {
644  case 0:
645  /* if macroblock width is 2, apply C-Y-C-Y; else
646  * apply C-Y-Y */
647  if (s->block_width == 2) {
654  } else {
660  }
661  break;
662 
663  case 1:
664  case 3:
665  /* always apply 2 Y predictors on these iterations */
670  break;
671 
672  case 2:
673  /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
674  * depending on the macroblock type */
675  if (s->block_type == BLOCK_2x2) {
682  } else if (s->block_type == BLOCK_4x2) {
688  } else {
693  }
694  break;
695  }
696 
697  } else {
698 
699  /* skip (copy) four pixels, but reassign the horizontal
700  * predictor */
701  *vert_pred++ = *current_pixel_pair++;
702  horiz_pred = *current_pixel_pair - *vert_pred;
703  *vert_pred++ = *current_pixel_pair++;
704 
705  }
706 
707  if (!keyframe) {
708  mb_change_byte_mask <<= 1;
709 
710  /* next byte */
711  if (!mb_change_byte_mask) {
712  mb_change_byte = mb_change_bits[mb_change_index++];
713  mb_change_byte_mask = 0x01;
714  }
715  }
716 
717  pixels_left -= 4;
718  }
719 
720  /* next change row */
721  if (((y + 1) & 3) == 0)
722  mb_change_bits += s->mb_change_bits_row_size;
723 
724  current_line += s->frame.linesize[0];
725  }
726 }
727 
729 {
730  int y;
731  int pixels_left; /* remaining pixels on this line */
732  unsigned int predictor_pair;
733  unsigned int horiz_pred;
734  unsigned int *vert_pred;
735  unsigned int *current_pixel_pair;
736  unsigned char *current_line = s->frame.data[0];
737  int keyframe = s->flags & FLAG_KEYFRAME;
738 
739  /* these variables are for managing the stream of macroblock change bits */
740  const unsigned char *mb_change_bits = s->mb_change_bits;
741  unsigned char mb_change_byte;
742  unsigned char mb_change_byte_mask;
743  int mb_change_index;
744 
745  /* these variables are for managing the main index stream */
746  int index_stream_index = 0; /* yes, the index into the index stream */
747  int index;
748 
749  /* clean out the line buffer */
750  memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
751 
752  GET_NEXT_INDEX();
753 
754  for (y = 0; y < s->avctx->height; y++) {
755 
756  /* re-init variables for the next line iteration */
757  horiz_pred = 0;
758  current_pixel_pair = (unsigned int *)current_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) {
780  } else {
786  }
787  break;
788 
789  case 1:
790  case 3:
791  /* always apply 2 Y predictors on these iterations */
796  break;
797 
798  case 2:
799  /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
800  * depending on the macroblock type */
801  if (s->block_type == BLOCK_2x2) {
808  } else if (s->block_type == BLOCK_4x2) {
814  } else {
819  }
820  break;
821  }
822 
823  } else {
824 
825  /* skip (copy) four pixels, but reassign the horizontal
826  * predictor */
827  *vert_pred++ = *current_pixel_pair++;
828  horiz_pred = *current_pixel_pair - *vert_pred;
829  *vert_pred++ = *current_pixel_pair++;
830 
831  }
832 
833  if (!keyframe) {
834  mb_change_byte_mask <<= 1;
835 
836  /* next byte */
837  if (!mb_change_byte_mask) {
838  mb_change_byte = mb_change_bits[mb_change_index++];
839  mb_change_byte_mask = 0x01;
840  }
841  }
842 
843  pixels_left -= 2;
844  }
845 
846  /* next change row */
847  if (((y + 1) & 3) == 0)
848  mb_change_bits += s->mb_change_bits_row_size;
849 
850  current_line += s->frame.linesize[0];
851  }
852 }
853 
854 
856  void *data, int *got_frame,
857  AVPacket *avpkt)
858 {
859  const uint8_t *buf = avpkt->data;
860  int buf_size = avpkt->size;
861  TrueMotion1Context *s = avctx->priv_data;
862 
863  s->buf = buf;
864  s->size = buf_size;
865 
866  if (truemotion1_decode_header(s) == -1)
867  return -1;
868 
869  s->frame.reference = 1;
872  if (avctx->reget_buffer(avctx, &s->frame) < 0) {
873  av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
874  return -1;
875  }
876 
877  if (compression_types[s->compression].algorithm == ALGO_RGB24H) {
879  } else if (compression_types[s->compression].algorithm != ALGO_NOP) {
881  }
882 
883  *got_frame = 1;
884  *(AVFrame*)data = s->frame;
885 
886  /* report that the buffer was completely consumed */
887  return buf_size;
888 }
889 
891 {
892  TrueMotion1Context *s = avctx->priv_data;
893 
894  if (s->frame.data[0])
895  avctx->release_buffer(avctx, &s->frame);
896 
897  av_free(s->vert_pred);
898 
899  return 0;
900 }
901 
903  .name = "truemotion1",
904  .type = AVMEDIA_TYPE_VIDEO,
906  .priv_data_size = sizeof(TrueMotion1Context),
910  .capabilities = CODEC_CAP_DR1,
911  .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 1.0"),
912 };