Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / indeo4.c
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 {
41 InvTransformPtr *inv_trans;
42 DCTransformPtr *dc_trans;
43 int is_2d_trans;
44 } transforms[18] = {
45 { ff_ivi_inverse_haar_8x8, ff_ivi_dc_haar_2d, 1 },
46 { ff_ivi_row_haar8, ff_ivi_dc_haar_2d, 0 },
47 { ff_ivi_col_haar8, ff_ivi_dc_haar_2d, 0 },
48 { ff_ivi_put_pixels_8x8, ff_ivi_put_dc_pixel_8x8, 1 },
49 { ff_ivi_inverse_slant_8x8, ff_ivi_dc_slant_2d, 1 },
50 { ff_ivi_row_slant8, ff_ivi_dc_row_slant, 1 },
51 { ff_ivi_col_slant8, ff_ivi_dc_col_slant, 1 },
52 { NULL, NULL, 0 }, /* inverse DCT 8x8 */
53 { NULL, NULL, 0 }, /* inverse DCT 8x1 */
54 { NULL, NULL, 0 }, /* inverse DCT 1x8 */
55 { ff_ivi_inverse_haar_4x4, ff_ivi_dc_haar_2d, 1 },
56 { ff_ivi_inverse_slant_4x4, ff_ivi_dc_slant_2d, 1 },
57 { NULL, NULL, 0 }, /* no transform 4x4 */
58 { ff_ivi_row_haar4, ff_ivi_dc_haar_2d, 0 },
59 { ff_ivi_col_haar4, ff_ivi_dc_haar_2d, 0 },
60 { ff_ivi_row_slant4, ff_ivi_dc_row_slant, 0 },
61 { ff_ivi_col_slant4, ff_ivi_dc_col_slant, 0 },
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 */
75 static int decode_plane_subdivision(GetBitContext *gb)
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 */
104 static int decode_pic_hdr(IVI45DecContext *ctx, AVCodecContext *avctx)
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 */
142 if (ctx->frame_type >= IVI4_FRAMETYPE_NULL_FIRST) {
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
214 if (ff_ivi_init_tiles(ctx->planes, ctx->pic_conf.tile_width,
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 */
269 static int decode_band_hdr(IVI45DecContext *ctx, IVIBandDesc *band,
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) {
434 band->intra_base = &ivi4_quant_8x8_intra[quant_index_to_tab[band->quant_mat]][0];
435 band->inter_base = &ivi4_quant_8x8_inter[quant_index_to_tab[band->quant_mat]][0];
436 } else {
437 band->intra_base = &ivi4_quant_4x4_intra[quant_index_to_tab[band->quant_mat]][0];
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 */
466 static int decode_mb_info(IVI45DecContext *ctx, IVIBandDesc *band,
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 ||
535 ctx->frame_type == IVI4_FRAMETYPE_INTRA1) {
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 */
627 static void switch_buffers(IVI45DecContext *ctx)
628 {
629 int is_prev_ref = 0, is_ref = 0;
630
631 switch (ctx->prev_frame_type) {
632 case IVI4_FRAMETYPE_INTRA:
633 case IVI4_FRAMETYPE_INTRA1:
634 case IVI4_FRAMETYPE_INTER:
635 is_prev_ref = 1;
636 break;
637 }
638
639 switch (ctx->frame_type) {
640 case IVI4_FRAMETYPE_INTRA:
641 case IVI4_FRAMETYPE_INTRA1:
642 case IVI4_FRAMETYPE_INTER:
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
656 static int is_nonnull_frame(IVI45DecContext *ctx)
657 {
658 return ctx->frame_type < IVI4_FRAMETYPE_NULL_FIRST;
659 }
660
661
662 static av_cold int decode_init(AVCodecContext *avctx)
663 {
664 IVI45DecContext *ctx = avctx->priv_data;
665
666 ff_ivi_init_static_vlc();
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
678 ctx->decode_pic_hdr = decode_pic_hdr;
679 ctx->decode_band_hdr = decode_band_hdr;
680 ctx->decode_mb_info = decode_mb_info;
681 ctx->switch_buffers = switch_buffers;
682 ctx->is_nonnull_frame = is_nonnull_frame;
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
697 AVCodec ff_indeo4_decoder = {
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,
705 .decode = ff_ivi_decode_frame,
706 .capabilities = CODEC_CAP_DR1,
707 };