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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 FFmpeg.
6  *
7  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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 #define IVI4_PIC_SIZE_ESC 7
38 
39 
40 static const struct {
44 } transforms[18] = {
52  { NULL, NULL, 0 }, /* inverse DCT 8x8 */
53  { NULL, NULL, 0 }, /* inverse DCT 8x1 */
54  { NULL, NULL, 0 }, /* inverse DCT 1x8 */
57  { NULL, NULL, 0 }, /* no transform 4x4 */
62  { NULL, NULL, 0 }, /* inverse DCT 4x4 */
63 };
64 
65 /**
66  * Decode subdivision of a plane.
67  * This is a simplified version that checks for two supported subdivisions:
68  * - 1 wavelet band per plane, size factor 1:1, code pattern: 3
69  * - 4 wavelet bands per plane, size factor 1:4, code pattern: 2,3,3,3,3
70  * Anything else is either unsupported or corrupt.
71  *
72  * @param[in,out] gb the GetBit context
73  * @return number of wavelet bands or 0 on error
74  */
76 {
77  int i;
78 
79  switch (get_bits(gb, 2)) {
80  case 3:
81  return 1;
82  case 2:
83  for (i = 0; i < 4; i++)
84  if (get_bits(gb, 2) != 3)
85  return 0;
86  return 4;
87  default:
88  return 0;
89  }
90 }
91 
92 static inline int scale_tile_size(int def_size, int size_factor)
93 {
94  return size_factor == 15 ? def_size : (size_factor + 1) << 5;
95 }
96 
97 /**
98  * Decode Indeo 4 picture header.
99  *
100  * @param[in,out] ctx pointer to the decoder context
101  * @param[in] avctx pointer to the AVCodecContext
102  * @return result code: 0 = OK, negative number = error
103  */
105 {
106  int pic_size_indx, i, p;
107  IVIPicConfig pic_conf;
108 
109  if (get_bits(&ctx->gb, 18) != 0x3FFF8) {
110  av_log(avctx, AV_LOG_ERROR, "Invalid picture start code!\n");
111  return AVERROR_INVALIDDATA;
112  }
113 
114  ctx->prev_frame_type = ctx->frame_type;
115  ctx->frame_type = get_bits(&ctx->gb, 3);
116  if (ctx->frame_type == 7) {
117  av_log(avctx, AV_LOG_ERROR, "Invalid frame type: %d\n", ctx->frame_type);
118  return AVERROR_INVALIDDATA;
119  }
120 
121 #if IVI4_STREAM_ANALYSER
122  if (ctx->frame_type == IVI4_FRAMETYPE_BIDIR)
123  ctx->has_b_frames = 1;
124 #endif
125 
126  ctx->transp_status = get_bits1(&ctx->gb);
127 #if IVI4_STREAM_ANALYSER
128  if (ctx->transp_status) {
129  ctx->has_transp = 1;
130  }
131 #endif
132 
133  /* unknown bit: Mac decoder ignores this bit, XANIM returns error */
134  if (get_bits1(&ctx->gb)) {
135  av_log(avctx, AV_LOG_ERROR, "Sync bit is set!\n");
136  return AVERROR_INVALIDDATA;
137  }
138 
139  ctx->data_size = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 24) : 0;
140 
141  /* null frames don't contain anything else so we just return */
143  av_dlog(avctx, "Null frame encountered!\n");
144  return 0;
145  }
146 
147  /* Check key lock status. If enabled - ignore lock word. */
148  /* Usually we have to prompt the user for the password, but */
149  /* we don't do that because Indeo 4 videos can be decoded anyway */
150  if (get_bits1(&ctx->gb)) {
151  skip_bits_long(&ctx->gb, 32);
152  av_dlog(avctx, "Password-protected clip!\n");
153  }
154 
155  pic_size_indx = get_bits(&ctx->gb, 3);
156  if (pic_size_indx == IVI4_PIC_SIZE_ESC) {
157  pic_conf.pic_height = get_bits(&ctx->gb, 16);
158  pic_conf.pic_width = get_bits(&ctx->gb, 16);
159  } else {
160  pic_conf.pic_height = ivi4_common_pic_sizes[pic_size_indx * 2 + 1];
161  pic_conf.pic_width = ivi4_common_pic_sizes[pic_size_indx * 2 ];
162  }
163 
164  /* Decode tile dimensions. */
165  if (get_bits1(&ctx->gb)) {
166  pic_conf.tile_height = scale_tile_size(pic_conf.pic_height, get_bits(&ctx->gb, 4));
167  pic_conf.tile_width = scale_tile_size(pic_conf.pic_width, get_bits(&ctx->gb, 4));
168 #if IVI4_STREAM_ANALYSER
169  ctx->uses_tiling = 1;
170 #endif
171  } else {
172  pic_conf.tile_height = pic_conf.pic_height;
173  pic_conf.tile_width = pic_conf.pic_width;
174  }
175 
176  /* Decode chroma subsampling. We support only 4:4 aka YVU9. */
177  if (get_bits(&ctx->gb, 2)) {
178  av_log(avctx, AV_LOG_ERROR, "Only YVU9 picture format is supported!\n");
179  return AVERROR_INVALIDDATA;
180  }
181  pic_conf.chroma_height = (pic_conf.pic_height + 3) >> 2;
182  pic_conf.chroma_width = (pic_conf.pic_width + 3) >> 2;
183 
184  /* decode subdivision of the planes */
185  pic_conf.luma_bands = decode_plane_subdivision(&ctx->gb);
186  pic_conf.chroma_bands = 0;
187  if (pic_conf.luma_bands)
188  pic_conf.chroma_bands = decode_plane_subdivision(&ctx->gb);
189  ctx->is_scalable = pic_conf.luma_bands != 1 || pic_conf.chroma_bands != 1;
190  if (ctx->is_scalable && (pic_conf.luma_bands != 4 || pic_conf.chroma_bands != 1)) {
191  av_log(avctx, AV_LOG_ERROR, "Scalability: unsupported subdivision! Luma bands: %d, chroma bands: %d\n",
192  pic_conf.luma_bands, pic_conf.chroma_bands);
193  return AVERROR_INVALIDDATA;
194  }
195 
196  /* check if picture layout was changed and reallocate buffers */
197  if (ivi_pic_config_cmp(&pic_conf, &ctx->pic_conf)) {
198  if (ff_ivi_init_planes(ctx->planes, &pic_conf, 1)) {
199  av_log(avctx, AV_LOG_ERROR, "Couldn't reallocate color planes!\n");
200  ctx->pic_conf.luma_bands = 0;
201  return AVERROR(ENOMEM);
202  }
203 
204  ctx->pic_conf = pic_conf;
205 
206  /* set default macroblock/block dimensions */
207  for (p = 0; p <= 2; p++) {
208  for (i = 0; i < (!p ? pic_conf.luma_bands : pic_conf.chroma_bands); i++) {
209  ctx->planes[p].bands[i].mb_size = !p ? (!ctx->is_scalable ? 16 : 8) : 4;
210  ctx->planes[p].bands[i].blk_size = !p ? 8 : 4;
211  }
212  }
213 
215  ctx->pic_conf.tile_height)) {
216  av_log(avctx, AV_LOG_ERROR,
217  "Couldn't reallocate internal structures!\n");
218  return AVERROR(ENOMEM);
219  }
220  }
221 
222  ctx->frame_num = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 20) : 0;
223 
224  /* skip decTimeEst field if present */
225  if (get_bits1(&ctx->gb))
226  skip_bits(&ctx->gb, 8);
227 
228  /* decode macroblock and block huffman codebooks */
229  if (ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_MB_HUFF, &ctx->mb_vlc, avctx) ||
230  ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_BLK_HUFF, &ctx->blk_vlc, avctx))
231  return AVERROR_INVALIDDATA;
232 
233  ctx->rvmap_sel = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 8;
234 
235  ctx->in_imf = get_bits1(&ctx->gb);
236  ctx->in_q = get_bits1(&ctx->gb);
237 
238  ctx->pic_glob_quant = get_bits(&ctx->gb, 5);
239 
240  /* TODO: ignore this parameter if unused */
241  ctx->unknown1 = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 0;
242 
243  ctx->checksum = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 16) : 0;
244 
245  /* skip picture header extension if any */
246  while (get_bits1(&ctx->gb)) {
247  av_dlog(avctx, "Pic hdr extension encountered!\n");
248  skip_bits(&ctx->gb, 8);
249  }
250 
251  if (get_bits1(&ctx->gb)) {
252  av_log(avctx, AV_LOG_ERROR, "Bad blocks bits encountered!\n");
253  }
254 
255  align_get_bits(&ctx->gb);
256 
257  return 0;
258 }
259 
260 
261 /**
262  * Decode Indeo 4 band header.
263  *
264  * @param[in,out] ctx pointer to the decoder context
265  * @param[in,out] band pointer to the band descriptor
266  * @param[in] avctx pointer to the AVCodecContext
267  * @return result code: 0 = OK, negative number = error
268  */
270  AVCodecContext *avctx)
271 {
272  int plane, band_num, indx, transform_id, scan_indx;
273  int i;
274  int quant_mat;
275 
276  plane = get_bits(&ctx->gb, 2);
277  band_num = get_bits(&ctx->gb, 4);
278  if (band->plane != plane || band->band_num != band_num) {
279  av_log(avctx, AV_LOG_ERROR, "Invalid band header sequence!\n");
280  return AVERROR_INVALIDDATA;
281  }
282 
283  band->is_empty = get_bits1(&ctx->gb);
284  if (!band->is_empty) {
285  int old_blk_size = band->blk_size;
286  /* skip header size
287  * If header size is not given, header size is 4 bytes. */
288  if (get_bits1(&ctx->gb))
289  skip_bits(&ctx->gb, 16);
290 
291  band->is_halfpel = get_bits(&ctx->gb, 2);
292  if (band->is_halfpel >= 2) {
293  av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported mv resolution: %d!\n",
294  band->is_halfpel);
295  return AVERROR_INVALIDDATA;
296  }
297 #if IVI4_STREAM_ANALYSER
298  if (!band->is_halfpel)
299  ctx->uses_fullpel = 1;
300 #endif
301 
302  band->checksum_present = get_bits1(&ctx->gb);
303  if (band->checksum_present)
304  band->checksum = get_bits(&ctx->gb, 16);
305 
306  indx = get_bits(&ctx->gb, 2);
307  if (indx == 3) {
308  av_log(avctx, AV_LOG_ERROR, "Invalid block size!\n");
309  return AVERROR_INVALIDDATA;
310  }
311  band->mb_size = 16 >> indx;
312  band->blk_size = 8 >> (indx >> 1);
313 
314  band->inherit_mv = get_bits1(&ctx->gb);
315  band->inherit_qdelta = get_bits1(&ctx->gb);
316 
317  band->glob_quant = get_bits(&ctx->gb, 5);
318 
319  if (!get_bits1(&ctx->gb) || ctx->frame_type == IVI4_FRAMETYPE_INTRA) {
320  transform_id = get_bits(&ctx->gb, 5);
321  if (transform_id >= FF_ARRAY_ELEMS(transforms) ||
322  !transforms[transform_id].inv_trans) {
323  avpriv_request_sample(avctx, "Transform %d", transform_id);
324  return AVERROR_PATCHWELCOME;
325  }
326  if ((transform_id >= 7 && transform_id <= 9) ||
327  transform_id == 17) {
328  avpriv_request_sample(avctx, "DCT transform");
329  return AVERROR_PATCHWELCOME;
330  }
331 
332  if (transform_id < 10 && band->blk_size < 8) {
333  av_log(avctx, AV_LOG_ERROR, "wrong transform size!\n");
334  return AVERROR_INVALIDDATA;
335  }
336 #if IVI4_STREAM_ANALYSER
337  if ((transform_id >= 0 && transform_id <= 2) || transform_id == 10)
338  ctx->uses_haar = 1;
339 #endif
340 
341  band->inv_transform = transforms[transform_id].inv_trans;
342  band->dc_transform = transforms[transform_id].dc_trans;
343  band->is_2d_trans = transforms[transform_id].is_2d_trans;
344 
345  if (transform_id < 10)
346  band->transform_size = 8;
347  else
348  band->transform_size = 4;
349 
350  if (band->blk_size != band->transform_size) {
351  av_log(avctx, AV_LOG_ERROR, "transform and block size mismatch (%d != %d)\n", band->transform_size, band->blk_size);
352  return AVERROR_INVALIDDATA;
353  }
354 
355  scan_indx = get_bits(&ctx->gb, 4);
356  if (scan_indx == 15) {
357  av_log(avctx, AV_LOG_ERROR, "Custom scan pattern encountered!\n");
358  return AVERROR_INVALIDDATA;
359  }
360  if (scan_indx > 4 && scan_indx < 10) {
361  if (band->blk_size != 4) {
362  av_log(avctx, AV_LOG_ERROR, "mismatching scan table!\n");
363  return AVERROR_INVALIDDATA;
364  }
365  } else if (band->blk_size != 8) {
366  av_log(avctx, AV_LOG_ERROR, "mismatching scan table!\n");
367  return AVERROR_INVALIDDATA;
368  }
369 
370  band->scan = scan_index_to_tab[scan_indx];
371  band->scan_size = band->blk_size;
372 
373  quant_mat = get_bits(&ctx->gb, 5);
374  if (quant_mat == 31) {
375  av_log(avctx, AV_LOG_ERROR, "Custom quant matrix encountered!\n");
376  return AVERROR_INVALIDDATA;
377  }
378  if (quant_mat >= FF_ARRAY_ELEMS(quant_index_to_tab)) {
379  avpriv_request_sample(avctx, "Quantization matrix %d",
380  quant_mat);
381  return AVERROR_INVALIDDATA;
382  }
383  band->quant_mat = quant_mat;
384  } else {
385  if (old_blk_size != band->blk_size) {
386  av_log(avctx, AV_LOG_ERROR,
387  "The band block size does not match the configuration "
388  "inherited\n");
389  return AVERROR_INVALIDDATA;
390  }
391  }
392  if (quant_index_to_tab[band->quant_mat] > 4 && band->blk_size == 4) {
393  av_log(avctx, AV_LOG_ERROR, "Invalid quant matrix for 4x4 block encountered!\n");
394  band->quant_mat = 0;
395  return AVERROR_INVALIDDATA;
396  }
397  if (band->scan_size != band->blk_size) {
398  av_log(avctx, AV_LOG_ERROR, "mismatching scan table!\n");
399  return AVERROR_INVALIDDATA;
400  }
401  if (band->transform_size == 8 && band->blk_size < 8) {
402  av_log(avctx, AV_LOG_ERROR, "mismatching transform_size!\n");
403  return AVERROR_INVALIDDATA;
404  }
405 
406  /* decode block huffman codebook */
407  if (!get_bits1(&ctx->gb))
408  band->blk_vlc.tab = ctx->blk_vlc.tab;
409  else
410  if (ff_ivi_dec_huff_desc(&ctx->gb, 1, IVI_BLK_HUFF,
411  &band->blk_vlc, avctx))
412  return AVERROR_INVALIDDATA;
413 
414  /* select appropriate rvmap table for this band */
415  band->rvmap_sel = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 8;
416 
417  /* decode rvmap probability corrections if any */
418  band->num_corr = 0; /* there is no corrections */
419  if (get_bits1(&ctx->gb)) {
420  band->num_corr = get_bits(&ctx->gb, 8); /* get number of correction pairs */
421  if (band->num_corr > 61) {
422  av_log(avctx, AV_LOG_ERROR, "Too many corrections: %d\n",
423  band->num_corr);
424  return AVERROR_INVALIDDATA;
425  }
426 
427  /* read correction pairs */
428  for (i = 0; i < band->num_corr * 2; i++)
429  band->corr[i] = get_bits(&ctx->gb, 8);
430  }
431  }
432 
433  if (band->blk_size == 8) {
435  band->inter_base = &ivi4_quant_8x8_inter[quant_index_to_tab[band->quant_mat]][0];
436  } else {
438  band->inter_base = &ivi4_quant_4x4_inter[quant_index_to_tab[band->quant_mat]][0];
439  }
440 
441  /* Indeo 4 doesn't use scale tables */
442  band->intra_scale = NULL;
443  band->inter_scale = NULL;
444 
445  align_get_bits(&ctx->gb);
446 
447  if (!band->scan) {
448  av_log(avctx, AV_LOG_ERROR, "band->scan not set\n");
449  return AVERROR_INVALIDDATA;
450  }
451 
452  return 0;
453 }
454 
455 
456 /**
457  * Decode information (block type, cbp, quant delta, motion vector)
458  * for all macroblocks in the current tile.
459  *
460  * @param[in,out] ctx pointer to the decoder context
461  * @param[in,out] band pointer to the band descriptor
462  * @param[in,out] tile pointer to the tile descriptor
463  * @param[in] avctx pointer to the AVCodecContext
464  * @return result code: 0 = OK, negative number = error
465  */
467  IVITile *tile, AVCodecContext *avctx)
468 {
469  int x, y, mv_x, mv_y, mv_delta, offs, mb_offset, blks_per_mb,
470  mv_scale, mb_type_bits, s;
471  IVIMbInfo *mb, *ref_mb;
472  int row_offset = band->mb_size * band->pitch;
473 
474  mb = tile->mbs;
475  ref_mb = tile->ref_mbs;
476  offs = tile->ypos * band->pitch + tile->xpos;
477 
478  blks_per_mb = band->mb_size != band->blk_size ? 4 : 1;
479  mb_type_bits = ctx->frame_type == IVI4_FRAMETYPE_BIDIR ? 2 : 1;
480 
481  /* scale factor for motion vectors */
482  mv_scale = (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3);
483  mv_x = mv_y = 0;
484 
485  if (((tile->width + band->mb_size-1)/band->mb_size) * ((tile->height + band->mb_size-1)/band->mb_size) != tile->num_MBs) {
486  av_log(avctx, AV_LOG_ERROR, "num_MBs mismatch %d %d %d %d\n", tile->width, tile->height, band->mb_size, tile->num_MBs);
487  return -1;
488  }
489 
490  for (y = tile->ypos; y < tile->ypos + tile->height; y += band->mb_size) {
491  mb_offset = offs;
492 
493  for (x = tile->xpos; x < tile->xpos + tile->width; x += band->mb_size) {
494  mb->xpos = x;
495  mb->ypos = y;
496  mb->buf_offs = mb_offset;
497  mb->b_mv_x =
498  mb->b_mv_y = 0;
499 
500  if (get_bits1(&ctx->gb)) {
501  if (ctx->frame_type == IVI4_FRAMETYPE_INTRA) {
502  av_log(avctx, AV_LOG_ERROR, "Empty macroblock in an INTRA picture!\n");
503  return AVERROR_INVALIDDATA;
504  }
505  mb->type = 1; /* empty macroblocks are always INTER */
506  mb->cbp = 0; /* all blocks are empty */
507 
508  mb->q_delta = 0;
509  if (!band->plane && !band->band_num && ctx->in_q) {
510  mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
511  IVI_VLC_BITS, 1);
512  mb->q_delta = IVI_TOSIGNED(mb->q_delta);
513  }
514 
515  mb->mv_x = mb->mv_y = 0; /* no motion vector coded */
516  if (band->inherit_mv && ref_mb) {
517  /* motion vector inheritance */
518  if (mv_scale) {
519  mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
520  mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
521  } else {
522  mb->mv_x = ref_mb->mv_x;
523  mb->mv_y = ref_mb->mv_y;
524  }
525  }
526  } else {
527  if (band->inherit_mv) {
528  /* copy mb_type from corresponding reference mb */
529  if (!ref_mb) {
530  av_log(avctx, AV_LOG_ERROR, "ref_mb unavailable\n");
531  return AVERROR_INVALIDDATA;
532  }
533  mb->type = ref_mb->type;
534  } else if (ctx->frame_type == IVI4_FRAMETYPE_INTRA ||
536  mb->type = 0; /* mb_type is always INTRA for intra-frames */
537  } else {
538  mb->type = get_bits(&ctx->gb, mb_type_bits);
539  }
540 
541  mb->cbp = get_bits(&ctx->gb, blks_per_mb);
542 
543  mb->q_delta = 0;
544  if (band->inherit_qdelta) {
545  if (ref_mb) mb->q_delta = ref_mb->q_delta;
546  } else if (mb->cbp || (!band->plane && !band->band_num &&
547  ctx->in_q)) {
548  mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
549  IVI_VLC_BITS, 1);
550  mb->q_delta = IVI_TOSIGNED(mb->q_delta);
551  }
552 
553  if (!mb->type) {
554  mb->mv_x = mb->mv_y = 0; /* there is no motion vector in intra-macroblocks */
555  } else {
556  if (band->inherit_mv) {
557  if (ref_mb)
558  /* motion vector inheritance */
559  if (mv_scale) {
560  mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
561  mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
562  } else {
563  mb->mv_x = ref_mb->mv_x;
564  mb->mv_y = ref_mb->mv_y;
565  }
566  } else {
567  /* decode motion vector deltas */
568  mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
569  IVI_VLC_BITS, 1);
570  mv_y += IVI_TOSIGNED(mv_delta);
571  mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
572  IVI_VLC_BITS, 1);
573  mv_x += IVI_TOSIGNED(mv_delta);
574  mb->mv_x = mv_x;
575  mb->mv_y = mv_y;
576  if (mb->type == 3) {
577  mv_delta = get_vlc2(&ctx->gb,
578  ctx->mb_vlc.tab->table,
579  IVI_VLC_BITS, 1);
580  mv_y += IVI_TOSIGNED(mv_delta);
581  mv_delta = get_vlc2(&ctx->gb,
582  ctx->mb_vlc.tab->table,
583  IVI_VLC_BITS, 1);
584  mv_x += IVI_TOSIGNED(mv_delta);
585  mb->b_mv_x = -mv_x;
586  mb->b_mv_y = -mv_y;
587  }
588  }
589  if (mb->type == 2) {
590  mb->b_mv_x = -mb->mv_x;
591  mb->b_mv_y = -mb->mv_y;
592  mb->mv_x = 0;
593  mb->mv_y = 0;
594  }
595  }
596  }
597 
598  s= band->is_halfpel;
599  if (mb->type)
600  if ( x + (mb->mv_x >>s) + (y+ (mb->mv_y >>s))*band->pitch < 0 ||
601  x + ((mb->mv_x+s)>>s) + band->mb_size - 1
602  + (y+band->mb_size - 1 +((mb->mv_y+s)>>s))*band->pitch > band->bufsize -1) {
603  av_log(avctx, AV_LOG_ERROR, "motion vector %d %d outside reference\n", x*s + mb->mv_x, y*s + mb->mv_y);
604  return AVERROR_INVALIDDATA;
605  }
606 
607  mb++;
608  if (ref_mb)
609  ref_mb++;
610  mb_offset += band->mb_size;
611  }
612 
613  offs += row_offset;
614  }
615 
616  align_get_bits(&ctx->gb);
617 
618  return 0;
619 }
620 
621 
622 /**
623  * Rearrange decoding and reference buffers.
624  *
625  * @param[in,out] ctx pointer to the decoder context
626  */
628 {
629  int is_prev_ref = 0, is_ref = 0;
630 
631  switch (ctx->prev_frame_type) {
635  is_prev_ref = 1;
636  break;
637  }
638 
639  switch (ctx->frame_type) {
643  is_ref = 1;
644  break;
645  }
646 
647  if (is_prev_ref && is_ref) {
648  FFSWAP(int, ctx->dst_buf, ctx->ref_buf);
649  } else if (is_prev_ref) {
650  FFSWAP(int, ctx->ref_buf, ctx->b_ref_buf);
651  FFSWAP(int, ctx->dst_buf, ctx->ref_buf);
652  }
653 }
654 
655 
657 {
659 }
660 
661 
663 {
664  IVI45DecContext *ctx = avctx->priv_data;
665 
667 
668  /* copy rvmap tables in our context so we can apply changes to them */
669  memcpy(ctx->rvmap_tabs, ff_ivi_rvmap_tabs, sizeof(ff_ivi_rvmap_tabs));
670 
671  /* Force allocation of the internal buffers */
672  /* during picture header decoding. */
673  ctx->pic_conf.pic_width = 0;
674  ctx->pic_conf.pic_height = 0;
675 
676  avctx->pix_fmt = AV_PIX_FMT_YUV410P;
677 
683 
684  ctx->is_indeo4 = 1;
685 
686  ctx->dst_buf = 0;
687  ctx->ref_buf = 1;
688  ctx->b_ref_buf = 3; /* buffer 2 is used for scalability mode */
689  ctx->p_frame = av_frame_alloc();
690  if (!ctx->p_frame)
691  return AVERROR(ENOMEM);
692 
693  return 0;
694 }
695 
696 
698  .name = "indeo4",
699  .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 4"),
700  .type = AVMEDIA_TYPE_VIDEO,
701  .id = AV_CODEC_ID_INDEO4,
702  .priv_data_size = sizeof(IVI45DecContext),
703  .init = decode_init,
704  .close = ff_ivi_decode_close,
706  .capabilities = CODEC_CAP_DR1,
707 };