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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 /**
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] = {
65  { NULL, NULL, 0 }, /* inverse DCT 8x8 */
66  { NULL, NULL, 0 }, /* inverse DCT 8x1 */
67  { NULL, NULL, 0 }, /* inverse DCT 1x8 */
70  { NULL, NULL, 0 }, /* no transform 4x4 */
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  ctx->pic_conf.luma_bands = 0;
214  return AVERROR(ENOMEM);
215  }
216 
217  ctx->pic_conf = pic_conf;
218 
219  /* set default macroblock/block dimensions */
220  for (p = 0; p <= 2; p++) {
221  for (i = 0; i < (!p ? pic_conf.luma_bands : pic_conf.chroma_bands); i++) {
222  ctx->planes[p].bands[i].mb_size = !p ? (!ctx->is_scalable ? 16 : 8) : 4;
223  ctx->planes[p].bands[i].blk_size = !p ? 8 : 4;
224  }
225  }
226 
228  ctx->pic_conf.tile_height)) {
229  av_log(avctx, AV_LOG_ERROR,
230  "Couldn't reallocate internal structures!\n");
231  return AVERROR(ENOMEM);
232  }
233  }
234 
235  ctx->frame_num = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 20) : 0;
236 
237  /* skip decTimeEst field if present */
238  if (get_bits1(&ctx->gb))
239  skip_bits(&ctx->gb, 8);
240 
241  /* decode macroblock and block huffman codebooks */
242  if (ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_MB_HUFF, &ctx->mb_vlc, avctx) ||
243  ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_BLK_HUFF, &ctx->blk_vlc, avctx))
244  return AVERROR_INVALIDDATA;
245 
246  ctx->rvmap_sel = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 8;
247 
248  ctx->in_imf = get_bits1(&ctx->gb);
249  ctx->in_q = get_bits1(&ctx->gb);
250 
251  ctx->pic_glob_quant = get_bits(&ctx->gb, 5);
252 
253  /* TODO: ignore this parameter if unused */
254  ctx->unknown1 = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 0;
255 
256  ctx->checksum = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 16) : 0;
257 
258  /* skip picture header extension if any */
259  while (get_bits1(&ctx->gb)) {
260  av_dlog(avctx, "Pic hdr extension encountered!\n");
261  skip_bits(&ctx->gb, 8);
262  }
263 
264  if (get_bits1(&ctx->gb)) {
265  av_log(avctx, AV_LOG_ERROR, "Bad blocks bits encountered!\n");
266  }
267 
268  align_get_bits(&ctx->gb);
269 
270  return 0;
271 }
272 
273 
274 /**
275  * Decode Indeo 4 band header.
276  *
277  * @param[in,out] ctx pointer to the decoder context
278  * @param[in,out] band pointer to the band descriptor
279  * @param[in] avctx pointer to the AVCodecContext
280  * @return result code: 0 = OK, negative number = error
281  */
283  AVCodecContext *avctx)
284 {
285  int plane, band_num, indx, transform_id, scan_indx;
286  int i;
287  int quant_mat;
288 
289  plane = get_bits(&ctx->gb, 2);
290  band_num = get_bits(&ctx->gb, 4);
291  if (band->plane != plane || band->band_num != band_num) {
292  av_log(avctx, AV_LOG_ERROR, "Invalid band header sequence!\n");
293  return AVERROR_INVALIDDATA;
294  }
295 
296  band->is_empty = get_bits1(&ctx->gb);
297  if (!band->is_empty) {
298  int old_blk_size = band->blk_size;
299  /* skip header size
300  * If header size is not given, header size is 4 bytes. */
301  if (get_bits1(&ctx->gb))
302  skip_bits(&ctx->gb, 16);
303 
304  band->is_halfpel = get_bits(&ctx->gb, 2);
305  if (band->is_halfpel >= 2) {
306  av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported mv resolution: %d!\n",
307  band->is_halfpel);
308  return AVERROR_INVALIDDATA;
309  }
310 #if IVI4_STREAM_ANALYSER
311  if (!band->is_halfpel)
312  ctx->uses_fullpel = 1;
313 #endif
314 
315  band->checksum_present = get_bits1(&ctx->gb);
316  if (band->checksum_present)
317  band->checksum = get_bits(&ctx->gb, 16);
318 
319  indx = get_bits(&ctx->gb, 2);
320  if (indx == 3) {
321  av_log(avctx, AV_LOG_ERROR, "Invalid block size!\n");
322  return AVERROR_INVALIDDATA;
323  }
324  band->mb_size = 16 >> indx;
325  band->blk_size = 8 >> (indx >> 1);
326 
327  band->inherit_mv = get_bits1(&ctx->gb);
328  band->inherit_qdelta = get_bits1(&ctx->gb);
329 
330  band->glob_quant = get_bits(&ctx->gb, 5);
331 
332  if (!get_bits1(&ctx->gb) || ctx->frame_type == FRAMETYPE_INTRA) {
333  transform_id = get_bits(&ctx->gb, 5);
334  if (transform_id >= FF_ARRAY_ELEMS(transforms) ||
335  !transforms[transform_id].inv_trans) {
336  avpriv_request_sample(avctx, "Transform %d", transform_id);
337  return AVERROR_PATCHWELCOME;
338  }
339  if ((transform_id >= 7 && transform_id <= 9) ||
340  transform_id == 17) {
341  avpriv_request_sample(avctx, "DCT transform");
342  return AVERROR_PATCHWELCOME;
343  }
344 
345  if (transform_id < 10 && band->blk_size < 8) {
346  av_log(avctx, AV_LOG_ERROR, "wrong transform size!\n");
347  return AVERROR_INVALIDDATA;
348  }
349 #if IVI4_STREAM_ANALYSER
350  if ((transform_id >= 0 && transform_id <= 2) || transform_id == 10)
351  ctx->uses_haar = 1;
352 #endif
353 
354  band->inv_transform = transforms[transform_id].inv_trans;
355  band->dc_transform = transforms[transform_id].dc_trans;
356  band->is_2d_trans = transforms[transform_id].is_2d_trans;
357 
358  if (transform_id < 10)
359  band->transform_size = 8;
360  else
361  band->transform_size = 4;
362 
363  if (band->blk_size != band->transform_size) {
364  av_log(avctx, AV_LOG_ERROR, "transform and block size mismatch (%d != %d)\n", band->transform_size, band->blk_size);
365  return AVERROR_INVALIDDATA;
366  }
367 
368  scan_indx = get_bits(&ctx->gb, 4);
369  if (scan_indx == 15) {
370  av_log(avctx, AV_LOG_ERROR, "Custom scan pattern encountered!\n");
371  return AVERROR_INVALIDDATA;
372  }
373  if (scan_indx > 4 && scan_indx < 10) {
374  if (band->blk_size != 4) {
375  av_log(avctx, AV_LOG_ERROR, "mismatching scan table!\n");
376  return AVERROR_INVALIDDATA;
377  }
378  } else if (band->blk_size != 8) {
379  av_log(avctx, AV_LOG_ERROR, "mismatching scan table!\n");
380  return AVERROR_INVALIDDATA;
381  }
382 
383  band->scan = scan_index_to_tab[scan_indx];
384  band->scan_size = band->blk_size;
385 
386  quant_mat = get_bits(&ctx->gb, 5);
387  if (quant_mat == 31) {
388  av_log(avctx, AV_LOG_ERROR, "Custom quant matrix encountered!\n");
389  return AVERROR_INVALIDDATA;
390  }
391  if (quant_mat >= FF_ARRAY_ELEMS(quant_index_to_tab)) {
392  avpriv_request_sample(avctx, "Quantization matrix %d",
393  quant_mat);
394  return AVERROR_INVALIDDATA;
395  }
396  band->quant_mat = quant_mat;
397  } else {
398  if (old_blk_size != band->blk_size) {
399  av_log(avctx, AV_LOG_ERROR,
400  "The band block size does not match the configuration "
401  "inherited\n");
402  return AVERROR_INVALIDDATA;
403  }
404  }
405  if (quant_index_to_tab[band->quant_mat] > 4 && band->blk_size == 4) {
406  av_log(avctx, AV_LOG_ERROR, "Invalid quant matrix for 4x4 block encountered!\n");
407  band->quant_mat = 0;
408  return AVERROR_INVALIDDATA;
409  }
410  if (band->scan_size != band->blk_size) {
411  av_log(avctx, AV_LOG_ERROR, "mismatching scan table!\n");
412  return AVERROR_INVALIDDATA;
413  }
414  if (band->transform_size == 8 && band->blk_size < 8) {
415  av_log(avctx, AV_LOG_ERROR, "mismatching transform_size!\n");
416  return AVERROR_INVALIDDATA;
417  }
418 
419  /* decode block huffman codebook */
420  if (!get_bits1(&ctx->gb))
421  band->blk_vlc.tab = ctx->blk_vlc.tab;
422  else
423  if (ff_ivi_dec_huff_desc(&ctx->gb, 1, IVI_BLK_HUFF,
424  &band->blk_vlc, avctx))
425  return AVERROR_INVALIDDATA;
426 
427  /* select appropriate rvmap table for this band */
428  band->rvmap_sel = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 8;
429 
430  /* decode rvmap probability corrections if any */
431  band->num_corr = 0; /* there is no corrections */
432  if (get_bits1(&ctx->gb)) {
433  band->num_corr = get_bits(&ctx->gb, 8); /* get number of correction pairs */
434  if (band->num_corr > 61) {
435  av_log(avctx, AV_LOG_ERROR, "Too many corrections: %d\n",
436  band->num_corr);
437  return AVERROR_INVALIDDATA;
438  }
439 
440  /* read correction pairs */
441  for (i = 0; i < band->num_corr * 2; i++)
442  band->corr[i] = get_bits(&ctx->gb, 8);
443  }
444  }
445 
446  if (band->blk_size == 8) {
448  band->inter_base = &ivi4_quant_8x8_inter[quant_index_to_tab[band->quant_mat]][0];
449  } else {
451  band->inter_base = &ivi4_quant_4x4_inter[quant_index_to_tab[band->quant_mat]][0];
452  }
453 
454  /* Indeo 4 doesn't use scale tables */
455  band->intra_scale = NULL;
456  band->inter_scale = NULL;
457 
458  align_get_bits(&ctx->gb);
459 
460  if (!band->scan) {
461  av_log(avctx, AV_LOG_ERROR, "band->scan not set\n");
462  return AVERROR_INVALIDDATA;
463  }
464 
465  return 0;
466 }
467 
468 
469 /**
470  * Decode information (block type, cbp, quant delta, motion vector)
471  * for all macroblocks in the current tile.
472  *
473  * @param[in,out] ctx pointer to the decoder context
474  * @param[in,out] band pointer to the band descriptor
475  * @param[in,out] tile pointer to the tile descriptor
476  * @param[in] avctx pointer to the AVCodecContext
477  * @return result code: 0 = OK, negative number = error
478  */
480  IVITile *tile, AVCodecContext *avctx)
481 {
482  int x, y, mv_x, mv_y, mv_delta, offs, mb_offset, blks_per_mb,
483  mv_scale, mb_type_bits, s;
484  IVIMbInfo *mb, *ref_mb;
485  int row_offset = band->mb_size * band->pitch;
486 
487  mb = tile->mbs;
488  ref_mb = tile->ref_mbs;
489  offs = tile->ypos * band->pitch + tile->xpos;
490 
491  blks_per_mb = band->mb_size != band->blk_size ? 4 : 1;
492  mb_type_bits = ctx->frame_type == FRAMETYPE_BIDIR ? 2 : 1;
493 
494  /* scale factor for motion vectors */
495  mv_scale = (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3);
496  mv_x = mv_y = 0;
497 
498  if (((tile->width + band->mb_size-1)/band->mb_size) * ((tile->height + band->mb_size-1)/band->mb_size) != tile->num_MBs) {
499  av_log(avctx, AV_LOG_ERROR, "num_MBs mismatch %d %d %d %d\n", tile->width, tile->height, band->mb_size, tile->num_MBs);
500  return -1;
501  }
502 
503  for (y = tile->ypos; y < tile->ypos + tile->height; y += band->mb_size) {
504  mb_offset = offs;
505 
506  for (x = tile->xpos; x < tile->xpos + tile->width; x += band->mb_size) {
507  mb->xpos = x;
508  mb->ypos = y;
509  mb->buf_offs = mb_offset;
510 
511  if (get_bits1(&ctx->gb)) {
512  if (ctx->frame_type == FRAMETYPE_INTRA) {
513  av_log(avctx, AV_LOG_ERROR, "Empty macroblock in an INTRA picture!\n");
514  return AVERROR_INVALIDDATA;
515  }
516  mb->type = 1; /* empty macroblocks are always INTER */
517  mb->cbp = 0; /* all blocks are empty */
518 
519  mb->q_delta = 0;
520  if (!band->plane && !band->band_num && ctx->in_q) {
521  mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
522  IVI_VLC_BITS, 1);
523  mb->q_delta = IVI_TOSIGNED(mb->q_delta);
524  }
525 
526  mb->mv_x = mb->mv_y = 0; /* no motion vector coded */
527  if (band->inherit_mv && ref_mb) {
528  /* motion vector inheritance */
529  if (mv_scale) {
530  mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
531  mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
532  } else {
533  mb->mv_x = ref_mb->mv_x;
534  mb->mv_y = ref_mb->mv_y;
535  }
536  }
537  } else {
538  if (band->inherit_mv) {
539  /* copy mb_type from corresponding reference mb */
540  if (!ref_mb) {
541  av_log(avctx, AV_LOG_ERROR, "ref_mb unavailable\n");
542  return AVERROR_INVALIDDATA;
543  }
544  mb->type = ref_mb->type;
545  } else if (ctx->frame_type == FRAMETYPE_INTRA ||
546  ctx->frame_type == FRAMETYPE_INTRA1) {
547  mb->type = 0; /* mb_type is always INTRA for intra-frames */
548  } else {
549  mb->type = get_bits(&ctx->gb, mb_type_bits);
550  }
551 
552  mb->cbp = get_bits(&ctx->gb, blks_per_mb);
553 
554  mb->q_delta = 0;
555  if (band->inherit_qdelta) {
556  if (ref_mb) mb->q_delta = ref_mb->q_delta;
557  } else if (mb->cbp || (!band->plane && !band->band_num &&
558  ctx->in_q)) {
559  mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
560  IVI_VLC_BITS, 1);
561  mb->q_delta = IVI_TOSIGNED(mb->q_delta);
562  }
563 
564  if (!mb->type) {
565  mb->mv_x = mb->mv_y = 0; /* there is no motion vector in intra-macroblocks */
566  } else {
567  if (band->inherit_mv) {
568  if (ref_mb)
569  /* motion vector inheritance */
570  if (mv_scale) {
571  mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
572  mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
573  } else {
574  mb->mv_x = ref_mb->mv_x;
575  mb->mv_y = ref_mb->mv_y;
576  }
577  } else {
578  /* decode motion vector deltas */
579  mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
580  IVI_VLC_BITS, 1);
581  mv_y += IVI_TOSIGNED(mv_delta);
582  mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
583  IVI_VLC_BITS, 1);
584  mv_x += IVI_TOSIGNED(mv_delta);
585  mb->mv_x = mv_x;
586  mb->mv_y = mv_y;
587  }
588  }
589  }
590 
591  s= band->is_halfpel;
592  if (mb->type)
593  if ( x + (mb->mv_x >>s) + (y+ (mb->mv_y >>s))*band->pitch < 0 ||
594  x + ((mb->mv_x+s)>>s) + band->mb_size - 1
595  + (y+band->mb_size - 1 +((mb->mv_y+s)>>s))*band->pitch > band->bufsize -1) {
596  av_log(avctx, AV_LOG_ERROR, "motion vector %d %d outside reference\n", x*s + mb->mv_x, y*s + mb->mv_y);
597  return AVERROR_INVALIDDATA;
598  }
599 
600  mb++;
601  if (ref_mb)
602  ref_mb++;
603  mb_offset += band->mb_size;
604  }
605 
606  offs += row_offset;
607  }
608 
609  align_get_bits(&ctx->gb);
610 
611  return 0;
612 }
613 
614 
615 /**
616  * Rearrange decoding and reference buffers.
617  *
618  * @param[in,out] ctx pointer to the decoder context
619  */
621 {
622  switch (ctx->prev_frame_type) {
623  case FRAMETYPE_INTRA:
624  case FRAMETYPE_INTRA1:
625  case FRAMETYPE_INTER:
626  ctx->buf_switch ^= 1;
627  ctx->dst_buf = ctx->buf_switch;
628  ctx->ref_buf = ctx->buf_switch ^ 1;
629  break;
631  break;
632  }
633 
634  switch (ctx->frame_type) {
635  case FRAMETYPE_INTRA:
636  case FRAMETYPE_INTRA1:
637  ctx->buf_switch = 0;
638  /* FALLTHROUGH */
639  case FRAMETYPE_INTER:
640  ctx->dst_buf = ctx->buf_switch;
641  ctx->ref_buf = ctx->buf_switch ^ 1;
642  break;
645  case FRAMETYPE_NULL_LAST:
646  break;
647  }
648 }
649 
650 
652 {
653  return ctx->frame_type < FRAMETYPE_NULL_FIRST;
654 }
655 
656 
658 {
659  IVI45DecContext *ctx = avctx->priv_data;
660 
662 
663  /* copy rvmap tables in our context so we can apply changes to them */
664  memcpy(ctx->rvmap_tabs, ff_ivi_rvmap_tabs, sizeof(ff_ivi_rvmap_tabs));
665 
666  /* Force allocation of the internal buffers */
667  /* during picture header decoding. */
668  ctx->pic_conf.pic_width = 0;
669  ctx->pic_conf.pic_height = 0;
670 
671  avctx->pix_fmt = AV_PIX_FMT_YUV410P;
672 
678 
679  return 0;
680 }
681 
682 
684  .name = "indeo4",
685  .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 4"),
686  .type = AVMEDIA_TYPE_VIDEO,
687  .id = AV_CODEC_ID_INDEO4,
688  .priv_data_size = sizeof(IVI45DecContext),
689  .init = decode_init,
692  .capabilities = CODEC_CAP_DR1,
693 };