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indeo4.c
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1 /*
2  * Indeo Video Interactive v4 compatible decoder
3  * Copyright (c) 2009-2011 Maxim Poliakovski
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 
22 /**
23  * @file
24  * Indeo Video Interactive version 4 decoder
25  *
26  * Indeo 4 data is usually transported within .avi or .mov files.
27  * Known FOURCCs: 'IV41'
28  */
29 
30 #define BITSTREAM_READER_LE
31 #include "avcodec.h"
32 #include "get_bits.h"
33 #include "ivi_dsp.h"
34 #include "ivi_common.h"
35 #include "indeo4data.h"
36 
37 /**
38  * Indeo 4 frame types.
39  */
40 enum {
42  FRAMETYPE_INTRA1 = 1, ///< intra frame with slightly different bitstream coding
43  FRAMETYPE_INTER = 2, ///< non-droppable P-frame
44  FRAMETYPE_BIDIR = 3, ///< bidirectional frame
45  FRAMETYPE_INTER_NOREF = 4, ///< droppable P-frame
46  FRAMETYPE_NULL_FIRST = 5, ///< empty frame with no data
47  FRAMETYPE_NULL_LAST = 6 ///< empty frame with no data
48 };
49 
50 #define IVI4_PIC_SIZE_ESC 7
51 
52 
53 static const struct {
57 } transforms[18] = {
59  { NULL, NULL, 0 }, /* inverse Haar 8x1 */
60  { NULL, NULL, 0 }, /* inverse Haar 1x8 */
65  { NULL, NULL, 0 }, /* inverse DCT 8x8 */
66  { NULL, NULL, 0 }, /* inverse DCT 8x1 */
67  { NULL, NULL, 0 }, /* inverse DCT 1x8 */
68  { NULL, NULL, 0 }, /* inverse Haar 4x4 */
70  { NULL, NULL, 0 }, /* no transform 4x4 */
71  { NULL, NULL, 0 }, /* inverse Haar 1x4 */
72  { NULL, NULL, 0 }, /* inverse Haar 4x1 */
73  { NULL, NULL, 0 }, /* inverse slant 1x4 */
74  { NULL, NULL, 0 }, /* inverse slant 4x1 */
75  { NULL, NULL, 0 }, /* inverse DCT 4x4 */
76 };
77 
78 /**
79  * Decode subdivision of a plane.
80  * This is a simplified version that checks for two supported subdivisions:
81  * - 1 wavelet band per plane, size factor 1:1, code pattern: 3
82  * - 4 wavelet bands per plane, size factor 1:4, code pattern: 2,3,3,3,3
83  * Anything else is either unsupported or corrupt.
84  *
85  * @param[in,out] gb the GetBit context
86  * @return number of wavelet bands or 0 on error
87  */
89 {
90  int i;
91 
92  switch (get_bits(gb, 2)) {
93  case 3:
94  return 1;
95  case 2:
96  for (i = 0; i < 4; i++)
97  if (get_bits(gb, 2) != 3)
98  return 0;
99  return 4;
100  default:
101  return 0;
102  }
103 }
104 
105 static inline int scale_tile_size(int def_size, int size_factor)
106 {
107  return size_factor == 15 ? def_size : (size_factor + 1) << 5;
108 }
109 
110 /**
111  * Decode Indeo 4 picture header.
112  *
113  * @param[in,out] ctx pointer to the decoder context
114  * @param[in] avctx pointer to the AVCodecContext
115  * @return result code: 0 = OK, negative number = error
116  */
118 {
119  int pic_size_indx, i, p;
120  IVIPicConfig pic_conf;
121 
122  if (get_bits(&ctx->gb, 18) != 0x3FFF8) {
123  av_log(avctx, AV_LOG_ERROR, "Invalid picture start code!\n");
124  return AVERROR_INVALIDDATA;
125  }
126 
127  ctx->prev_frame_type = ctx->frame_type;
128  ctx->frame_type = get_bits(&ctx->gb, 3);
129  if (ctx->frame_type == 7) {
130  av_log(avctx, AV_LOG_ERROR, "Invalid frame type: %d\n", ctx->frame_type);
131  return AVERROR_INVALIDDATA;
132  }
133 
134 #if IVI4_STREAM_ANALYSER
135  if (ctx->frame_type == FRAMETYPE_BIDIR)
136  ctx->has_b_frames = 1;
137 #endif
138 
139  ctx->transp_status = get_bits1(&ctx->gb);
140 #if IVI4_STREAM_ANALYSER
141  if (ctx->transp_status) {
142  ctx->has_transp = 1;
143  }
144 #endif
145 
146  /* unknown bit: Mac decoder ignores this bit, XANIM returns error */
147  if (get_bits1(&ctx->gb)) {
148  av_log(avctx, AV_LOG_ERROR, "Sync bit is set!\n");
149  return AVERROR_INVALIDDATA;
150  }
151 
152  ctx->data_size = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 24) : 0;
153 
154  /* null frames don't contain anything else so we just return */
155  if (ctx->frame_type >= FRAMETYPE_NULL_FIRST) {
156  av_dlog(avctx, "Null frame encountered!\n");
157  return 0;
158  }
159 
160  /* Check key lock status. If enabled - ignore lock word. */
161  /* Usually we have to prompt the user for the password, but */
162  /* we don't do that because Indeo 4 videos can be decoded anyway */
163  if (get_bits1(&ctx->gb)) {
164  skip_bits_long(&ctx->gb, 32);
165  av_dlog(avctx, "Password-protected clip!\n");
166  }
167 
168  pic_size_indx = get_bits(&ctx->gb, 3);
169  if (pic_size_indx == IVI4_PIC_SIZE_ESC) {
170  pic_conf.pic_height = get_bits(&ctx->gb, 16);
171  pic_conf.pic_width = get_bits(&ctx->gb, 16);
172  } else {
173  pic_conf.pic_height = ivi4_common_pic_sizes[pic_size_indx * 2 + 1];
174  pic_conf.pic_width = ivi4_common_pic_sizes[pic_size_indx * 2 ];
175  }
176 
177  /* Decode tile dimensions. */
178  if (get_bits1(&ctx->gb)) {
179  pic_conf.tile_height = scale_tile_size(pic_conf.pic_height, get_bits(&ctx->gb, 4));
180  pic_conf.tile_width = scale_tile_size(pic_conf.pic_width, get_bits(&ctx->gb, 4));
181 #if IVI4_STREAM_ANALYSER
182  ctx->uses_tiling = 1;
183 #endif
184  } else {
185  pic_conf.tile_height = pic_conf.pic_height;
186  pic_conf.tile_width = pic_conf.pic_width;
187  }
188 
189  /* Decode chroma subsampling. We support only 4:4 aka YVU9. */
190  if (get_bits(&ctx->gb, 2)) {
191  av_log(avctx, AV_LOG_ERROR, "Only YVU9 picture format is supported!\n");
192  return AVERROR_INVALIDDATA;
193  }
194  pic_conf.chroma_height = (pic_conf.pic_height + 3) >> 2;
195  pic_conf.chroma_width = (pic_conf.pic_width + 3) >> 2;
196 
197  /* decode subdivision of the planes */
198  pic_conf.luma_bands = decode_plane_subdivision(&ctx->gb);
199  pic_conf.chroma_bands = 0;
200  if (pic_conf.luma_bands)
201  pic_conf.chroma_bands = decode_plane_subdivision(&ctx->gb);
202  ctx->is_scalable = pic_conf.luma_bands != 1 || pic_conf.chroma_bands != 1;
203  if (ctx->is_scalable && (pic_conf.luma_bands != 4 || pic_conf.chroma_bands != 1)) {
204  av_log(avctx, AV_LOG_ERROR, "Scalability: unsupported subdivision! Luma bands: %d, chroma bands: %d\n",
205  pic_conf.luma_bands, pic_conf.chroma_bands);
206  return AVERROR_INVALIDDATA;
207  }
208 
209  /* check if picture layout was changed and reallocate buffers */
210  if (ivi_pic_config_cmp(&pic_conf, &ctx->pic_conf)) {
211  if (ff_ivi_init_planes(ctx->planes, &pic_conf)) {
212  av_log(avctx, AV_LOG_ERROR, "Couldn't reallocate color planes!\n");
213  return AVERROR(ENOMEM);
214  }
215 
216  ctx->pic_conf = pic_conf;
217 
218  /* set default macroblock/block dimensions */
219  for (p = 0; p <= 2; p++) {
220  for (i = 0; i < (!p ? pic_conf.luma_bands : pic_conf.chroma_bands); i++) {
221  ctx->planes[p].bands[i].mb_size = !p ? (!ctx->is_scalable ? 16 : 8) : 4;
222  ctx->planes[p].bands[i].blk_size = !p ? 8 : 4;
223  }
224  }
225 
227  ctx->pic_conf.tile_height)) {
228  av_log(avctx, AV_LOG_ERROR,
229  "Couldn't reallocate internal structures!\n");
230  return AVERROR(ENOMEM);
231  }
232  }
233 
234  ctx->frame_num = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 20) : 0;
235 
236  /* skip decTimeEst field if present */
237  if (get_bits1(&ctx->gb))
238  skip_bits(&ctx->gb, 8);
239 
240  /* decode macroblock and block huffman codebooks */
241  if (ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_MB_HUFF, &ctx->mb_vlc, avctx) ||
242  ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_BLK_HUFF, &ctx->blk_vlc, avctx))
243  return AVERROR_INVALIDDATA;
244 
245  ctx->rvmap_sel = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 8;
246 
247  ctx->in_imf = get_bits1(&ctx->gb);
248  ctx->in_q = get_bits1(&ctx->gb);
249 
250  ctx->pic_glob_quant = get_bits(&ctx->gb, 5);
251 
252  /* TODO: ignore this parameter if unused */
253  ctx->unknown1 = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 0;
254 
255  ctx->checksum = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 16) : 0;
256 
257  /* skip picture header extension if any */
258  while (get_bits1(&ctx->gb)) {
259  av_dlog(avctx, "Pic hdr extension encountered!\n");
260  skip_bits(&ctx->gb, 8);
261  }
262 
263  if (get_bits1(&ctx->gb)) {
264  av_log(avctx, AV_LOG_ERROR, "Bad blocks bits encountered!\n");
265  }
266 
267  align_get_bits(&ctx->gb);
268 
269  return 0;
270 }
271 
272 
273 /**
274  * Decode Indeo 4 band header.
275  *
276  * @param[in,out] ctx pointer to the decoder context
277  * @param[in,out] band pointer to the band descriptor
278  * @param[in] avctx pointer to the AVCodecContext
279  * @return result code: 0 = OK, negative number = error
280  */
282  AVCodecContext *avctx)
283 {
284  int plane, band_num, indx, transform_id, scan_indx;
285  int i;
286  int quant_mat;
287 
288  plane = get_bits(&ctx->gb, 2);
289  band_num = get_bits(&ctx->gb, 4);
290  if (band->plane != plane || band->band_num != band_num) {
291  av_log(avctx, AV_LOG_ERROR, "Invalid band header sequence!\n");
292  return AVERROR_INVALIDDATA;
293  }
294 
295  band->is_empty = get_bits1(&ctx->gb);
296  if (!band->is_empty) {
297  /* skip header size
298  * If header size is not given, header size is 4 bytes. */
299  if (get_bits1(&ctx->gb))
300  skip_bits(&ctx->gb, 16);
301 
302  band->is_halfpel = get_bits(&ctx->gb, 2);
303  if (band->is_halfpel >= 2) {
304  av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported mv resolution: %d!\n",
305  band->is_halfpel);
306  return AVERROR_INVALIDDATA;
307  }
308 #if IVI4_STREAM_ANALYSER
309  if (!band->is_halfpel)
310  ctx->uses_fullpel = 1;
311 #endif
312 
313  band->checksum_present = get_bits1(&ctx->gb);
314  if (band->checksum_present)
315  band->checksum = get_bits(&ctx->gb, 16);
316 
317  indx = get_bits(&ctx->gb, 2);
318  if (indx == 3) {
319  av_log(avctx, AV_LOG_ERROR, "Invalid block size!\n");
320  return AVERROR_INVALIDDATA;
321  }
322  band->mb_size = 16 >> indx;
323  band->blk_size = 8 >> (indx >> 1);
324 
325  band->inherit_mv = get_bits1(&ctx->gb);
326  band->inherit_qdelta = get_bits1(&ctx->gb);
327 
328  band->glob_quant = get_bits(&ctx->gb, 5);
329 
330  if (!get_bits1(&ctx->gb) || ctx->frame_type == FRAMETYPE_INTRA) {
331  transform_id = get_bits(&ctx->gb, 5);
332  if (transform_id >= FF_ARRAY_ELEMS(transforms) ||
333  !transforms[transform_id].inv_trans) {
334  av_log_ask_for_sample(avctx, "Unimplemented transform: %d!\n", transform_id);
335  return AVERROR_PATCHWELCOME;
336  }
337  if ((transform_id >= 7 && transform_id <= 9) ||
338  transform_id == 17) {
339  av_log_ask_for_sample(avctx, "DCT transform not supported yet!\n");
340  return AVERROR_PATCHWELCOME;
341  }
342 
343  if (transform_id < 10 && band->blk_size < 8) {
344  av_log(avctx, AV_LOG_ERROR, "wrong transform size!\n");
345  return AVERROR_INVALIDDATA;
346  }
347 #if IVI4_STREAM_ANALYSER
348  if ((transform_id >= 0 && transform_id <= 2) || transform_id == 10)
349  ctx->uses_haar = 1;
350 #endif
351 
352  band->inv_transform = transforms[transform_id].inv_trans;
353  band->dc_transform = transforms[transform_id].dc_trans;
354  band->is_2d_trans = transforms[transform_id].is_2d_trans;
355  band->transform_size= (transform_id < 10) ? 8 : 4;
356 
357  scan_indx = get_bits(&ctx->gb, 4);
358  if ((scan_indx>4 && scan_indx<10) != (band->blk_size==4)) {
359  av_log(avctx, AV_LOG_ERROR, "mismatching scan table!\n");
360  return AVERROR_INVALIDDATA;
361  }
362  if (scan_indx == 15) {
363  av_log(avctx, AV_LOG_ERROR, "Custom scan pattern encountered!\n");
364  return AVERROR_INVALIDDATA;
365  }
366  band->scan = scan_index_to_tab[scan_indx];
367  band->scan_size = band->blk_size;
368 
369  quant_mat = get_bits(&ctx->gb, 5);
370  if (quant_mat == 31) {
371  av_log(avctx, AV_LOG_ERROR, "Custom quant matrix encountered!\n");
372  return AVERROR_INVALIDDATA;
373  }
374  if (quant_mat > 21) {
375  av_log(avctx, AV_LOG_ERROR, "Invalid quant matrix encountered!\n");
376  return AVERROR_INVALIDDATA;
377  }
378  band->quant_mat = quant_mat;
379  }
380  if (quant_index_to_tab[band->quant_mat] > 4 && band->blk_size == 4) {
381  av_log(avctx, AV_LOG_ERROR, "Invalid quant matrix for 4x4 block encountered!\n");
382  band->quant_mat = 0;
383  return AVERROR_INVALIDDATA;
384  }
385  if (band->scan_size != band->blk_size) {
386  av_log(avctx, AV_LOG_ERROR, "mismatching scan table!\n");
387  return AVERROR_INVALIDDATA;
388  }
389  if (band->transform_size == 8 && band->blk_size < 8) {
390  av_log(avctx, AV_LOG_ERROR, "mismatching transform_size!\n");
391  return AVERROR_INVALIDDATA;
392  }
393 
394  /* decode block huffman codebook */
395  if (ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_BLK_HUFF,
396  &band->blk_vlc, avctx))
397  return AVERROR_INVALIDDATA;
398 
399  /* select appropriate rvmap table for this band */
400  band->rvmap_sel = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 8;
401 
402  /* decode rvmap probability corrections if any */
403  band->num_corr = 0; /* there is no corrections */
404  if (get_bits1(&ctx->gb)) {
405  band->num_corr = get_bits(&ctx->gb, 8); /* get number of correction pairs */
406  if (band->num_corr > 61) {
407  av_log(avctx, AV_LOG_ERROR, "Too many corrections: %d\n",
408  band->num_corr);
409  return AVERROR_INVALIDDATA;
410  }
411 
412  /* read correction pairs */
413  for (i = 0; i < band->num_corr * 2; i++)
414  band->corr[i] = get_bits(&ctx->gb, 8);
415  }
416  }
417 
418  if (band->blk_size == 8) {
420  band->inter_base = &ivi4_quant_8x8_inter[quant_index_to_tab[band->quant_mat]][0];
421  } else {
423  band->inter_base = &ivi4_quant_4x4_inter[quant_index_to_tab[band->quant_mat]][0];
424  }
425 
426  /* Indeo 4 doesn't use scale tables */
427  band->intra_scale = NULL;
428  band->inter_scale = NULL;
429 
430  align_get_bits(&ctx->gb);
431 
432  if (!band->scan) {
433  av_log(avctx, AV_LOG_ERROR, "band->scan not set\n");
434  return AVERROR_INVALIDDATA;
435  }
436 
437  return 0;
438 }
439 
440 
441 /**
442  * Decode information (block type, cbp, quant delta, motion vector)
443  * for all macroblocks in the current tile.
444  *
445  * @param[in,out] ctx pointer to the decoder context
446  * @param[in,out] band pointer to the band descriptor
447  * @param[in,out] tile pointer to the tile descriptor
448  * @param[in] avctx pointer to the AVCodecContext
449  * @return result code: 0 = OK, negative number = error
450  */
452  IVITile *tile, AVCodecContext *avctx)
453 {
454  int x, y, mv_x, mv_y, mv_delta, offs, mb_offset, blks_per_mb,
455  mv_scale, mb_type_bits, s;
456  IVIMbInfo *mb, *ref_mb;
457  int row_offset = band->mb_size * band->pitch;
458 
459  mb = tile->mbs;
460  ref_mb = tile->ref_mbs;
461  offs = tile->ypos * band->pitch + tile->xpos;
462 
463  blks_per_mb = band->mb_size != band->blk_size ? 4 : 1;
464  mb_type_bits = ctx->frame_type == FRAMETYPE_BIDIR ? 2 : 1;
465 
466  /* scale factor for motion vectors */
467  mv_scale = (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3);
468  mv_x = mv_y = 0;
469 
470  if (((tile->width + band->mb_size-1)/band->mb_size) * ((tile->height + band->mb_size-1)/band->mb_size) != tile->num_MBs) {
471  av_log(avctx, AV_LOG_ERROR, "num_MBs mismatch %d %d %d %d\n", tile->width, tile->height, band->mb_size, tile->num_MBs);
472  return -1;
473  }
474 
475  for (y = tile->ypos; y < tile->ypos + tile->height; y += band->mb_size) {
476  mb_offset = offs;
477 
478  for (x = tile->xpos; x < tile->xpos + tile->width; x += band->mb_size) {
479  mb->xpos = x;
480  mb->ypos = y;
481  mb->buf_offs = mb_offset;
482 
483  if (get_bits1(&ctx->gb)) {
484  if (ctx->frame_type == FRAMETYPE_INTRA) {
485  av_log(avctx, AV_LOG_ERROR, "Empty macroblock in an INTRA picture!\n");
486  return AVERROR_INVALIDDATA;
487  }
488  mb->type = 1; /* empty macroblocks are always INTER */
489  mb->cbp = 0; /* all blocks are empty */
490 
491  mb->q_delta = 0;
492  if (!band->plane && !band->band_num && ctx->in_q) {
493  mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
494  IVI_VLC_BITS, 1);
495  mb->q_delta = IVI_TOSIGNED(mb->q_delta);
496  }
497 
498  mb->mv_x = mb->mv_y = 0; /* no motion vector coded */
499  if (band->inherit_mv && ref_mb) {
500  /* motion vector inheritance */
501  if (mv_scale) {
502  mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
503  mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
504  } else {
505  mb->mv_x = ref_mb->mv_x;
506  mb->mv_y = ref_mb->mv_y;
507  }
508  }
509  } else {
510  if (band->inherit_mv && ref_mb) {
511  mb->type = ref_mb->type; /* copy mb_type from corresponding reference mb */
512  } else if (ctx->frame_type == FRAMETYPE_INTRA ||
513  ctx->frame_type == FRAMETYPE_INTRA1) {
514  mb->type = 0; /* mb_type is always INTRA for intra-frames */
515  } else {
516  mb->type = get_bits(&ctx->gb, mb_type_bits);
517  }
518 
519  mb->cbp = get_bits(&ctx->gb, blks_per_mb);
520 
521  mb->q_delta = 0;
522  if (band->inherit_qdelta) {
523  if (ref_mb) mb->q_delta = ref_mb->q_delta;
524  } else if (mb->cbp || (!band->plane && !band->band_num &&
525  ctx->in_q)) {
526  mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
527  IVI_VLC_BITS, 1);
528  mb->q_delta = IVI_TOSIGNED(mb->q_delta);
529  }
530 
531  if (!mb->type) {
532  mb->mv_x = mb->mv_y = 0; /* there is no motion vector in intra-macroblocks */
533  } else {
534  if (band->inherit_mv && ref_mb) {
535  /* motion vector inheritance */
536  if (mv_scale) {
537  mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
538  mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
539  } else {
540  mb->mv_x = ref_mb->mv_x;
541  mb->mv_y = ref_mb->mv_y;
542  }
543  } else {
544  /* decode motion vector deltas */
545  mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
546  IVI_VLC_BITS, 1);
547  mv_y += IVI_TOSIGNED(mv_delta);
548  mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
549  IVI_VLC_BITS, 1);
550  mv_x += IVI_TOSIGNED(mv_delta);
551  mb->mv_x = mv_x;
552  mb->mv_y = mv_y;
553  }
554  }
555  }
556 
557  s= band->is_halfpel;
558  if (mb->type)
559  if ( x + (mb->mv_x >>s) + (y+ (mb->mv_y >>s))*band->pitch < 0 ||
560  x + ((mb->mv_x+s)>>s) + band->mb_size - 1
561  + (y+band->mb_size - 1 +((mb->mv_y+s)>>s))*band->pitch > band->bufsize -1) {
562  av_log(avctx, AV_LOG_ERROR, "motion vector %d %d outside reference\n", x*s + mb->mv_x, y*s + mb->mv_y);
563  return AVERROR_INVALIDDATA;
564  }
565 
566  mb++;
567  if (ref_mb)
568  ref_mb++;
569  mb_offset += band->mb_size;
570  }
571 
572  offs += row_offset;
573  }
574 
575  align_get_bits(&ctx->gb);
576 
577  return 0;
578 }
579 
580 
581 /**
582  * Rearrange decoding and reference buffers.
583  *
584  * @param[in,out] ctx pointer to the decoder context
585  */
587 {
588  switch (ctx->prev_frame_type) {
589  case FRAMETYPE_INTRA:
590  case FRAMETYPE_INTRA1:
591  case FRAMETYPE_INTER:
592  ctx->buf_switch ^= 1;
593  ctx->dst_buf = ctx->buf_switch;
594  ctx->ref_buf = ctx->buf_switch ^ 1;
595  break;
597  break;
598  }
599 
600  switch (ctx->frame_type) {
601  case FRAMETYPE_INTRA:
602  case FRAMETYPE_INTRA1:
603  ctx->buf_switch = 0;
604  /* FALLTHROUGH */
605  case FRAMETYPE_INTER:
606  ctx->dst_buf = ctx->buf_switch;
607  ctx->ref_buf = ctx->buf_switch ^ 1;
608  break;
611  case FRAMETYPE_NULL_LAST:
612  break;
613  }
614 }
615 
616 
618 {
619  return ctx->frame_type < FRAMETYPE_NULL_FIRST;
620 }
621 
622 
624 {
625  IVI45DecContext *ctx = avctx->priv_data;
626 
628 
629  /* copy rvmap tables in our context so we can apply changes to them */
630  memcpy(ctx->rvmap_tabs, ff_ivi_rvmap_tabs, sizeof(ff_ivi_rvmap_tabs));
631 
632  /* Force allocation of the internal buffers */
633  /* during picture header decoding. */
634  ctx->pic_conf.pic_width = 0;
635  ctx->pic_conf.pic_height = 0;
636 
637  avctx->pix_fmt = AV_PIX_FMT_YUV410P;
638 
644 
645  return 0;
646 }
647 
648 
650  .name = "indeo4",
651  .type = AVMEDIA_TYPE_VIDEO,
652  .id = AV_CODEC_ID_INDEO4,
653  .priv_data_size = sizeof(IVI45DecContext),
654  .init = decode_init,
657  .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 4"),
658  .capabilities = CODEC_CAP_DR1,
659 };