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path: root/libavcodec/indeo4.c (plain)
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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 "indeo4data.h"
34#include "internal.h"
35#include "ivi.h"
36#include "ivi_dsp.h"
37
38#define IVI4_PIC_SIZE_ESC 7
39
40
41static const struct {
42 InvTransformPtr *inv_trans;
43 DCTransformPtr *dc_trans;
44 int is_2d_trans;
45} transforms[18] = {
46 { ff_ivi_inverse_haar_8x8, ff_ivi_dc_haar_2d, 1 },
47 { ff_ivi_row_haar8, ff_ivi_dc_haar_2d, 0 },
48 { ff_ivi_col_haar8, ff_ivi_dc_haar_2d, 0 },
49 { ff_ivi_put_pixels_8x8, ff_ivi_put_dc_pixel_8x8, 1 },
50 { ff_ivi_inverse_slant_8x8, ff_ivi_dc_slant_2d, 1 },
51 { ff_ivi_row_slant8, ff_ivi_dc_row_slant, 1 },
52 { ff_ivi_col_slant8, ff_ivi_dc_col_slant, 1 },
53 { NULL, NULL, 0 }, /* inverse DCT 8x8 */
54 { NULL, NULL, 0 }, /* inverse DCT 8x1 */
55 { NULL, NULL, 0 }, /* inverse DCT 1x8 */
56 { ff_ivi_inverse_haar_4x4, ff_ivi_dc_haar_2d, 1 },
57 { ff_ivi_inverse_slant_4x4, ff_ivi_dc_slant_2d, 1 },
58 { NULL, NULL, 0 }, /* no transform 4x4 */
59 { ff_ivi_row_haar4, ff_ivi_dc_haar_2d, 0 },
60 { ff_ivi_col_haar4, ff_ivi_dc_haar_2d, 0 },
61 { ff_ivi_row_slant4, ff_ivi_dc_row_slant, 0 },
62 { ff_ivi_col_slant4, ff_ivi_dc_col_slant, 0 },
63 { NULL, NULL, 0 }, /* inverse DCT 4x4 */
64};
65
66/**
67 * Decode subdivision of a plane.
68 * This is a simplified version that checks for two supported subdivisions:
69 * - 1 wavelet band per plane, size factor 1:1, code pattern: 3
70 * - 4 wavelet bands per plane, size factor 1:4, code pattern: 2,3,3,3,3
71 * Anything else is either unsupported or corrupt.
72 *
73 * @param[in,out] gb the GetBit context
74 * @return number of wavelet bands or 0 on error
75 */
76static int decode_plane_subdivision(GetBitContext *gb)
77{
78 int i;
79
80 switch (get_bits(gb, 2)) {
81 case 3:
82 return 1;
83 case 2:
84 for (i = 0; i < 4; i++)
85 if (get_bits(gb, 2) != 3)
86 return 0;
87 return 4;
88 default:
89 return 0;
90 }
91}
92
93static inline int scale_tile_size(int def_size, int size_factor)
94{
95 return size_factor == 15 ? def_size : (size_factor + 1) << 5;
96}
97
98/**
99 * Decode Indeo 4 picture header.
100 *
101 * @param[in,out] ctx pointer to the decoder context
102 * @param[in] avctx pointer to the AVCodecContext
103 * @return result code: 0 = OK, negative number = error
104 */
105static int decode_pic_hdr(IVI45DecContext *ctx, AVCodecContext *avctx)
106{
107 int pic_size_indx, i, p;
108 IVIPicConfig pic_conf;
109
110 if (get_bits(&ctx->gb, 18) != 0x3FFF8) {
111 av_log(avctx, AV_LOG_ERROR, "Invalid picture start code!\n");
112 return AVERROR_INVALIDDATA;
113 }
114
115 ctx->prev_frame_type = ctx->frame_type;
116 ctx->frame_type = get_bits(&ctx->gb, 3);
117 if (ctx->frame_type == 7) {
118 av_log(avctx, AV_LOG_ERROR, "Invalid frame type: %d\n", ctx->frame_type);
119 return AVERROR_INVALIDDATA;
120 }
121
122 if (ctx->frame_type == IVI4_FRAMETYPE_BIDIR)
123 ctx->has_b_frames = 1;
124
125 ctx->has_transp = get_bits1(&ctx->gb);
126
127 /* unknown bit: Mac decoder ignores this bit, XANIM returns error */
128 if (get_bits1(&ctx->gb)) {
129 av_log(avctx, AV_LOG_ERROR, "Sync bit is set!\n");
130 return AVERROR_INVALIDDATA;
131 }
132
133 ctx->data_size = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 24) : 0;
134
135 /* null frames don't contain anything else so we just return */
136 if (ctx->frame_type >= IVI4_FRAMETYPE_NULL_FIRST) {
137 ff_dlog(avctx, "Null frame encountered!\n");
138 return 0;
139 }
140
141 /* Check key lock status. If enabled - ignore lock word. */
142 /* Usually we have to prompt the user for the password, but */
143 /* we don't do that because Indeo 4 videos can be decoded anyway */
144 if (get_bits1(&ctx->gb)) {
145 skip_bits_long(&ctx->gb, 32);
146 ff_dlog(avctx, "Password-protected clip!\n");
147 }
148
149 pic_size_indx = get_bits(&ctx->gb, 3);
150 if (pic_size_indx == IVI4_PIC_SIZE_ESC) {
151 pic_conf.pic_height = get_bits(&ctx->gb, 16);
152 pic_conf.pic_width = get_bits(&ctx->gb, 16);
153 } else {
154 pic_conf.pic_height = ivi4_common_pic_sizes[pic_size_indx * 2 + 1];
155 pic_conf.pic_width = ivi4_common_pic_sizes[pic_size_indx * 2 ];
156 }
157
158 /* Decode tile dimensions. */
159 ctx->uses_tiling = get_bits1(&ctx->gb);
160 if (ctx->uses_tiling) {
161 pic_conf.tile_height = scale_tile_size(pic_conf.pic_height, get_bits(&ctx->gb, 4));
162 pic_conf.tile_width = scale_tile_size(pic_conf.pic_width, get_bits(&ctx->gb, 4));
163 } else {
164 pic_conf.tile_height = pic_conf.pic_height;
165 pic_conf.tile_width = pic_conf.pic_width;
166 }
167
168 /* Decode chroma subsampling. We support only 4:4 aka YVU9. */
169 if (get_bits(&ctx->gb, 2)) {
170 av_log(avctx, AV_LOG_ERROR, "Only YVU9 picture format is supported!\n");
171 return AVERROR_INVALIDDATA;
172 }
173 pic_conf.chroma_height = (pic_conf.pic_height + 3) >> 2;
174 pic_conf.chroma_width = (pic_conf.pic_width + 3) >> 2;
175
176 /* decode subdivision of the planes */
177 pic_conf.luma_bands = decode_plane_subdivision(&ctx->gb);
178 pic_conf.chroma_bands = 0;
179 if (pic_conf.luma_bands)
180 pic_conf.chroma_bands = decode_plane_subdivision(&ctx->gb);
181 ctx->is_scalable = pic_conf.luma_bands != 1 || pic_conf.chroma_bands != 1;
182 if (ctx->is_scalable && (pic_conf.luma_bands != 4 || pic_conf.chroma_bands != 1)) {
183 av_log(avctx, AV_LOG_ERROR, "Scalability: unsupported subdivision! Luma bands: %d, chroma bands: %d\n",
184 pic_conf.luma_bands, pic_conf.chroma_bands);
185 return AVERROR_INVALIDDATA;
186 }
187
188 /* check if picture layout was changed and reallocate buffers */
189 if (ivi_pic_config_cmp(&pic_conf, &ctx->pic_conf)) {
190 if (ff_ivi_init_planes(ctx->planes, &pic_conf, 1)) {
191 av_log(avctx, AV_LOG_ERROR, "Couldn't reallocate color planes!\n");
192 ctx->pic_conf.luma_bands = 0;
193 return AVERROR(ENOMEM);
194 }
195
196 ctx->pic_conf = pic_conf;
197
198 /* set default macroblock/block dimensions */
199 for (p = 0; p <= 2; p++) {
200 for (i = 0; i < (!p ? pic_conf.luma_bands : pic_conf.chroma_bands); i++) {
201 ctx->planes[p].bands[i].mb_size = !p ? (!ctx->is_scalable ? 16 : 8) : 4;
202 ctx->planes[p].bands[i].blk_size = !p ? 8 : 4;
203 }
204 }
205
206 if (ff_ivi_init_tiles(ctx->planes, ctx->pic_conf.tile_width,
207 ctx->pic_conf.tile_height)) {
208 av_log(avctx, AV_LOG_ERROR,
209 "Couldn't reallocate internal structures!\n");
210 return AVERROR(ENOMEM);
211 }
212 }
213
214 ctx->frame_num = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 20) : 0;
215
216 /* skip decTimeEst field if present */
217 if (get_bits1(&ctx->gb))
218 skip_bits(&ctx->gb, 8);
219
220 /* decode macroblock and block huffman codebooks */
221 if (ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_MB_HUFF, &ctx->mb_vlc, avctx) ||
222 ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_BLK_HUFF, &ctx->blk_vlc, avctx))
223 return AVERROR_INVALIDDATA;
224
225 ctx->rvmap_sel = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 8;
226
227 ctx->in_imf = get_bits1(&ctx->gb);
228 ctx->in_q = get_bits1(&ctx->gb);
229
230 ctx->pic_glob_quant = get_bits(&ctx->gb, 5);
231
232 /* TODO: ignore this parameter if unused */
233 ctx->unknown1 = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 0;
234
235 ctx->checksum = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 16) : 0;
236
237 /* skip picture header extension if any */
238 while (get_bits1(&ctx->gb)) {
239 ff_dlog(avctx, "Pic hdr extension encountered!\n");
240 skip_bits(&ctx->gb, 8);
241 }
242
243 if (get_bits1(&ctx->gb)) {
244 av_log(avctx, AV_LOG_ERROR, "Bad blocks bits encountered!\n");
245 }
246
247 align_get_bits(&ctx->gb);
248
249 return 0;
250}
251
252
253/**
254 * Decode Indeo 4 band header.
255 *
256 * @param[in,out] ctx pointer to the decoder context
257 * @param[in,out] band pointer to the band descriptor
258 * @param[in] avctx pointer to the AVCodecContext
259 * @return result code: 0 = OK, negative number = error
260 */
261static int decode_band_hdr(IVI45DecContext *ctx, IVIBandDesc *band,
262 AVCodecContext *avctx)
263{
264 int plane, band_num, indx, transform_id, scan_indx;
265 int i;
266 int quant_mat;
267
268 plane = get_bits(&ctx->gb, 2);
269 band_num = get_bits(&ctx->gb, 4);
270 if (band->plane != plane || band->band_num != band_num) {
271 av_log(avctx, AV_LOG_ERROR, "Invalid band header sequence!\n");
272 return AVERROR_INVALIDDATA;
273 }
274
275 band->is_empty = get_bits1(&ctx->gb);
276 if (!band->is_empty) {
277 int old_blk_size = band->blk_size;
278 /* skip header size
279 * If header size is not given, header size is 4 bytes. */
280 if (get_bits1(&ctx->gb))
281 skip_bits(&ctx->gb, 16);
282
283 band->is_halfpel = get_bits(&ctx->gb, 2);
284 if (band->is_halfpel >= 2) {
285 av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported mv resolution: %d!\n",
286 band->is_halfpel);
287 return AVERROR_INVALIDDATA;
288 }
289 if (!band->is_halfpel)
290 ctx->uses_fullpel = 1;
291
292 band->checksum_present = get_bits1(&ctx->gb);
293 if (band->checksum_present)
294 band->checksum = get_bits(&ctx->gb, 16);
295
296 indx = get_bits(&ctx->gb, 2);
297 if (indx == 3) {
298 av_log(avctx, AV_LOG_ERROR, "Invalid block size!\n");
299 return AVERROR_INVALIDDATA;
300 }
301 band->mb_size = 16 >> indx;
302 band->blk_size = 8 >> (indx >> 1);
303
304 band->inherit_mv = get_bits1(&ctx->gb);
305 band->inherit_qdelta = get_bits1(&ctx->gb);
306
307 band->glob_quant = get_bits(&ctx->gb, 5);
308
309 if (!get_bits1(&ctx->gb) || ctx->frame_type == IVI4_FRAMETYPE_INTRA) {
310 transform_id = get_bits(&ctx->gb, 5);
311 if (transform_id >= FF_ARRAY_ELEMS(transforms) ||
312 !transforms[transform_id].inv_trans) {
313 avpriv_request_sample(avctx, "Transform %d", transform_id);
314 return AVERROR_PATCHWELCOME;
315 }
316 if ((transform_id >= 7 && transform_id <= 9) ||
317 transform_id == 17) {
318 avpriv_request_sample(avctx, "DCT transform");
319 return AVERROR_PATCHWELCOME;
320 }
321
322 if (transform_id < 10 && band->blk_size < 8) {
323 av_log(avctx, AV_LOG_ERROR, "wrong transform size!\n");
324 return AVERROR_INVALIDDATA;
325 }
326 if ((transform_id >= 0 && transform_id <= 2) || transform_id == 10)
327 ctx->uses_haar = 1;
328
329 band->inv_transform = transforms[transform_id].inv_trans;
330 band->dc_transform = transforms[transform_id].dc_trans;
331 band->is_2d_trans = transforms[transform_id].is_2d_trans;
332
333 if (transform_id < 10)
334 band->transform_size = 8;
335 else
336 band->transform_size = 4;
337
338 if (band->blk_size != band->transform_size) {
339 av_log(avctx, AV_LOG_ERROR, "transform and block size mismatch (%d != %d)\n", band->transform_size, band->blk_size);
340 return AVERROR_INVALIDDATA;
341 }
342
343 scan_indx = get_bits(&ctx->gb, 4);
344 if (scan_indx == 15) {
345 av_log(avctx, AV_LOG_ERROR, "Custom scan pattern encountered!\n");
346 return AVERROR_INVALIDDATA;
347 }
348 if (scan_indx > 4 && scan_indx < 10) {
349 if (band->blk_size != 4) {
350 av_log(avctx, AV_LOG_ERROR, "mismatching scan table!\n");
351 return AVERROR_INVALIDDATA;
352 }
353 } else if (band->blk_size != 8) {
354 av_log(avctx, AV_LOG_ERROR, "mismatching scan table!\n");
355 return AVERROR_INVALIDDATA;
356 }
357
358 band->scan = scan_index_to_tab[scan_indx];
359 band->scan_size = band->blk_size;
360
361 quant_mat = get_bits(&ctx->gb, 5);
362 if (quant_mat == 31) {
363 av_log(avctx, AV_LOG_ERROR, "Custom quant matrix encountered!\n");
364 return AVERROR_INVALIDDATA;
365 }
366 if (quant_mat >= FF_ARRAY_ELEMS(quant_index_to_tab)) {
367 avpriv_request_sample(avctx, "Quantization matrix %d",
368 quant_mat);
369 return AVERROR_INVALIDDATA;
370 }
371 band->quant_mat = quant_mat;
372 } else {
373 if (old_blk_size != band->blk_size) {
374 av_log(avctx, AV_LOG_ERROR,
375 "The band block size does not match the configuration "
376 "inherited\n");
377 return AVERROR_INVALIDDATA;
378 }
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 (!get_bits1(&ctx->gb))
396 band->blk_vlc.tab = ctx->blk_vlc.tab;
397 else
398 if (ff_ivi_dec_huff_desc(&ctx->gb, 1, IVI_BLK_HUFF,
399 &band->blk_vlc, avctx))
400 return AVERROR_INVALIDDATA;
401
402 /* select appropriate rvmap table for this band */
403 band->rvmap_sel = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 8;
404
405 /* decode rvmap probability corrections if any */
406 band->num_corr = 0; /* there is no corrections */
407 if (get_bits1(&ctx->gb)) {
408 band->num_corr = get_bits(&ctx->gb, 8); /* get number of correction pairs */
409 if (band->num_corr > 61) {
410 av_log(avctx, AV_LOG_ERROR, "Too many corrections: %d\n",
411 band->num_corr);
412 return AVERROR_INVALIDDATA;
413 }
414
415 /* read correction pairs */
416 for (i = 0; i < band->num_corr * 2; i++)
417 band->corr[i] = get_bits(&ctx->gb, 8);
418 }
419 }
420
421 if (band->blk_size == 8) {
422 band->intra_base = &ivi4_quant_8x8_intra[quant_index_to_tab[band->quant_mat]][0];
423 band->inter_base = &ivi4_quant_8x8_inter[quant_index_to_tab[band->quant_mat]][0];
424 } else {
425 band->intra_base = &ivi4_quant_4x4_intra[quant_index_to_tab[band->quant_mat]][0];
426 band->inter_base = &ivi4_quant_4x4_inter[quant_index_to_tab[band->quant_mat]][0];
427 }
428
429 /* Indeo 4 doesn't use scale tables */
430 band->intra_scale = NULL;
431 band->inter_scale = NULL;
432
433 align_get_bits(&ctx->gb);
434
435 if (!band->scan) {
436 av_log(avctx, AV_LOG_ERROR, "band->scan not set\n");
437 return AVERROR_INVALIDDATA;
438 }
439
440 return 0;
441}
442
443
444/**
445 * Decode information (block type, cbp, quant delta, motion vector)
446 * for all macroblocks in the current tile.
447 *
448 * @param[in,out] ctx pointer to the decoder context
449 * @param[in,out] band pointer to the band descriptor
450 * @param[in,out] tile pointer to the tile descriptor
451 * @param[in] avctx pointer to the AVCodecContext
452 * @return result code: 0 = OK, negative number = error
453 */
454static int decode_mb_info(IVI45DecContext *ctx, IVIBandDesc *band,
455 IVITile *tile, AVCodecContext *avctx)
456{
457 int x, y, mv_x, mv_y, mv_delta, offs, mb_offset, blks_per_mb,
458 mv_scale, mb_type_bits, s;
459 IVIMbInfo *mb, *ref_mb;
460 int row_offset = band->mb_size * band->pitch;
461
462 mb = tile->mbs;
463 ref_mb = tile->ref_mbs;
464 offs = tile->ypos * band->pitch + tile->xpos;
465
466 blks_per_mb = band->mb_size != band->blk_size ? 4 : 1;
467 mb_type_bits = ctx->frame_type == IVI4_FRAMETYPE_BIDIR ? 2 : 1;
468
469 /* scale factor for motion vectors */
470 mv_scale = (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3);
471 mv_x = mv_y = 0;
472
473 if (((tile->width + band->mb_size-1)/band->mb_size) * ((tile->height + band->mb_size-1)/band->mb_size) != tile->num_MBs) {
474 av_log(avctx, AV_LOG_ERROR, "num_MBs mismatch %d %d %d %d\n", tile->width, tile->height, band->mb_size, tile->num_MBs);
475 return -1;
476 }
477
478 for (y = tile->ypos; y < tile->ypos + tile->height; y += band->mb_size) {
479 mb_offset = offs;
480
481 for (x = tile->xpos; x < tile->xpos + tile->width; x += band->mb_size) {
482 mb->xpos = x;
483 mb->ypos = y;
484 mb->buf_offs = mb_offset;
485 mb->b_mv_x =
486 mb->b_mv_y = 0;
487
488 if (get_bits1(&ctx->gb)) {
489 if (ctx->frame_type == IVI4_FRAMETYPE_INTRA) {
490 av_log(avctx, AV_LOG_ERROR, "Empty macroblock in an INTRA picture!\n");
491 return AVERROR_INVALIDDATA;
492 }
493 mb->type = 1; /* empty macroblocks are always INTER */
494 mb->cbp = 0; /* all blocks are empty */
495
496 mb->q_delta = 0;
497 if (!band->plane && !band->band_num && ctx->in_q) {
498 mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
499 IVI_VLC_BITS, 1);
500 mb->q_delta = IVI_TOSIGNED(mb->q_delta);
501 }
502
503 mb->mv_x = mb->mv_y = 0; /* no motion vector coded */
504 if (band->inherit_mv && ref_mb) {
505 /* motion vector inheritance */
506 if (mv_scale) {
507 mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
508 mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
509 } else {
510 mb->mv_x = ref_mb->mv_x;
511 mb->mv_y = ref_mb->mv_y;
512 }
513 }
514 } else {
515 if (band->inherit_mv) {
516 /* copy mb_type from corresponding reference mb */
517 if (!ref_mb) {
518 av_log(avctx, AV_LOG_ERROR, "ref_mb unavailable\n");
519 return AVERROR_INVALIDDATA;
520 }
521 mb->type = ref_mb->type;
522 } else if (ctx->frame_type == IVI4_FRAMETYPE_INTRA ||
523 ctx->frame_type == IVI4_FRAMETYPE_INTRA1) {
524 mb->type = 0; /* mb_type is always INTRA for intra-frames */
525 } else {
526 mb->type = get_bits(&ctx->gb, mb_type_bits);
527 }
528
529 mb->cbp = get_bits(&ctx->gb, blks_per_mb);
530
531 mb->q_delta = 0;
532 if (band->inherit_qdelta) {
533 if (ref_mb) mb->q_delta = ref_mb->q_delta;
534 } else if (mb->cbp || (!band->plane && !band->band_num &&
535 ctx->in_q)) {
536 mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
537 IVI_VLC_BITS, 1);
538 mb->q_delta = IVI_TOSIGNED(mb->q_delta);
539 }
540
541 if (!mb->type) {
542 mb->mv_x = mb->mv_y = 0; /* there is no motion vector in intra-macroblocks */
543 } else {
544 if (band->inherit_mv) {
545 if (ref_mb)
546 /* motion vector inheritance */
547 if (mv_scale) {
548 mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
549 mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
550 } else {
551 mb->mv_x = ref_mb->mv_x;
552 mb->mv_y = ref_mb->mv_y;
553 }
554 } else {
555 /* decode motion vector deltas */
556 mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
557 IVI_VLC_BITS, 1);
558 mv_y += IVI_TOSIGNED(mv_delta);
559 mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
560 IVI_VLC_BITS, 1);
561 mv_x += IVI_TOSIGNED(mv_delta);
562 mb->mv_x = mv_x;
563 mb->mv_y = mv_y;
564 if (mb->type == 3) {
565 mv_delta = get_vlc2(&ctx->gb,
566 ctx->mb_vlc.tab->table,
567 IVI_VLC_BITS, 1);
568 mv_y += IVI_TOSIGNED(mv_delta);
569 mv_delta = get_vlc2(&ctx->gb,
570 ctx->mb_vlc.tab->table,
571 IVI_VLC_BITS, 1);
572 mv_x += IVI_TOSIGNED(mv_delta);
573 mb->b_mv_x = -mv_x;
574 mb->b_mv_y = -mv_y;
575 }
576 }
577 if (mb->type == 2) {
578 mb->b_mv_x = -mb->mv_x;
579 mb->b_mv_y = -mb->mv_y;
580 mb->mv_x = 0;
581 mb->mv_y = 0;
582 }
583 }
584 }
585
586 s= band->is_halfpel;
587 if (mb->type)
588 if ( x + (mb->mv_x >>s) + (y+ (mb->mv_y >>s))*band->pitch < 0 ||
589 x + ((mb->mv_x+s)>>s) + band->mb_size - 1
590 + (y+band->mb_size - 1 +((mb->mv_y+s)>>s))*band->pitch > band->bufsize -1) {
591 av_log(avctx, AV_LOG_ERROR, "motion vector %d %d outside reference\n", x*s + mb->mv_x, y*s + mb->mv_y);
592 return AVERROR_INVALIDDATA;
593 }
594
595 mb++;
596 if (ref_mb)
597 ref_mb++;
598 mb_offset += band->mb_size;
599 }
600
601 offs += row_offset;
602 }
603
604 align_get_bits(&ctx->gb);
605
606 return 0;
607}
608
609
610/**
611 * Rearrange decoding and reference buffers.
612 *
613 * @param[in,out] ctx pointer to the decoder context
614 */
615static void switch_buffers(IVI45DecContext *ctx)
616{
617 int is_prev_ref = 0, is_ref = 0;
618
619 switch (ctx->prev_frame_type) {
620 case IVI4_FRAMETYPE_INTRA:
621 case IVI4_FRAMETYPE_INTRA1:
622 case IVI4_FRAMETYPE_INTER:
623 is_prev_ref = 1;
624 break;
625 }
626
627 switch (ctx->frame_type) {
628 case IVI4_FRAMETYPE_INTRA:
629 case IVI4_FRAMETYPE_INTRA1:
630 case IVI4_FRAMETYPE_INTER:
631 is_ref = 1;
632 break;
633 }
634
635 if (is_prev_ref && is_ref) {
636 FFSWAP(int, ctx->dst_buf, ctx->ref_buf);
637 } else if (is_prev_ref) {
638 FFSWAP(int, ctx->ref_buf, ctx->b_ref_buf);
639 FFSWAP(int, ctx->dst_buf, ctx->ref_buf);
640 }
641}
642
643
644static int is_nonnull_frame(IVI45DecContext *ctx)
645{
646 return ctx->frame_type < IVI4_FRAMETYPE_NULL_FIRST;
647}
648
649
650static av_cold int decode_init(AVCodecContext *avctx)
651{
652 IVI45DecContext *ctx = avctx->priv_data;
653
654 ff_ivi_init_static_vlc();
655
656 /* copy rvmap tables in our context so we can apply changes to them */
657 memcpy(ctx->rvmap_tabs, ff_ivi_rvmap_tabs, sizeof(ff_ivi_rvmap_tabs));
658
659 /* Force allocation of the internal buffers */
660 /* during picture header decoding. */
661 ctx->pic_conf.pic_width = 0;
662 ctx->pic_conf.pic_height = 0;
663
664 avctx->pix_fmt = AV_PIX_FMT_YUV410P;
665
666 ctx->decode_pic_hdr = decode_pic_hdr;
667 ctx->decode_band_hdr = decode_band_hdr;
668 ctx->decode_mb_info = decode_mb_info;
669 ctx->switch_buffers = switch_buffers;
670 ctx->is_nonnull_frame = is_nonnull_frame;
671
672 ctx->is_indeo4 = 1;
673 ctx->show_indeo4_info = 1;
674
675 ctx->dst_buf = 0;
676 ctx->ref_buf = 1;
677 ctx->b_ref_buf = 3; /* buffer 2 is used for scalability mode */
678 ctx->p_frame = av_frame_alloc();
679 if (!ctx->p_frame)
680 return AVERROR(ENOMEM);
681
682 return 0;
683}
684
685
686AVCodec ff_indeo4_decoder = {
687 .name = "indeo4",
688 .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 4"),
689 .type = AVMEDIA_TYPE_VIDEO,
690 .id = AV_CODEC_ID_INDEO4,
691 .priv_data_size = sizeof(IVI45DecContext),
692 .init = decode_init,
693 .close = ff_ivi_decode_close,
694 .decode = ff_ivi_decode_frame,
695 .capabilities = AV_CODEC_CAP_DR1,
696};
697
generated by cgit at 2024-05-17 02:01:20 (GMT)