383bcf9ea298c035cd89da56f8bb315bb877adf8
[libav.git] / libavcodec / indeo5.c
1 /*
2 * Indeo Video Interactive v5 compatible decoder
3 * Copyright (c) 2009 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 libavcodec/indeo5.c
24 * Indeo Video Interactive version 5 decoder
25 *
26 * Indeo5 data is usually transported within .avi or .mov files.
27 * Known FOURCCs: 'IV50'
28 */
29
30 #define ALT_BITSTREAM_READER_LE
31 #include "avcodec.h"
32 #include "get_bits.h"
33 #include "dsputil.h"
34 #include "ivi_dsp.h"
35 #include "ivi_common.h"
36 #include "indeo5data.h"
37
38 /**
39 * Indeo5 frame types.
40 */
41 enum {
42 FRAMETYPE_INTRA = 0,
43 FRAMETYPE_INTER = 1, ///< non-droppable P-frame
44 FRAMETYPE_INTER_SCAL = 2, ///< droppable P-frame used in the scalability mode
45 FRAMETYPE_INTER_NOREF = 3, ///< droppable P-frame
46 FRAMETYPE_NULL = 4 ///< empty frame with no data
47 };
48
49 #define IVI5_PIC_SIZE_ESC 15
50
51 #define IVI5_IS_PROTECTED 0x20
52
53 typedef struct {
54 GetBitContext gb;
55 AVFrame frame;
56 RVMapDesc rvmap_tabs[9]; ///< local corrected copy of the static rvmap tables
57 IVIPlaneDesc planes[3]; ///< color planes
58 const uint8_t *frame_data; ///< input frame data pointer
59 int buf_switch; ///< used to switch between three buffers
60 int dst_buf; ///< buffer index for the currently decoded frame
61 int ref_buf; ///< inter frame reference buffer index
62 uint32_t frame_size; ///< frame size in bytes
63 int frame_type;
64 int prev_frame_type; ///< frame type of the previous frame
65 int frame_num;
66 uint32_t pic_hdr_size; ///< picture header size in bytes
67 uint8_t frame_flags;
68 uint16_t checksum; ///< frame checksum
69
70 IVIHuffTab mb_vlc; ///< vlc table for decoding macroblock data
71
72 uint16_t gop_hdr_size;
73 uint8_t gop_flags;
74 int is_scalable;
75 uint32_t lock_word;
76 IVIPicConfig pic_conf;
77 } IVI5DecContext;
78
79
80 /**
81 * Decodes Indeo5 GOP (Group of pictures) header.
82 * This header is present in key frames only.
83 * It defines parameters for all frames in a GOP.
84 *
85 * @param ctx [in,out] ptr to the decoder context
86 * @param avctx [in] ptr to the AVCodecContext
87 * @return result code: 0 = OK, -1 = error
88 */
89 static int decode_gop_header(IVI5DecContext *ctx, AVCodecContext *avctx)
90 {
91 int result, i, p, tile_size, pic_size_indx, mb_size, blk_size, blk_size_changed = 0;
92 IVIBandDesc *band, *band1, *band2;
93 IVIPicConfig pic_conf;
94
95 ctx->gop_flags = get_bits(&ctx->gb, 8);
96
97 ctx->gop_hdr_size = (ctx->gop_flags & 1) ? get_bits(&ctx->gb, 16) : 0;
98
99 if (ctx->gop_flags & IVI5_IS_PROTECTED)
100 ctx->lock_word = get_bits_long(&ctx->gb, 32);
101
102 tile_size = (ctx->gop_flags & 0x40) ? 64 << get_bits(&ctx->gb, 2) : 0;
103 if (tile_size > 256) {
104 av_log(avctx, AV_LOG_ERROR, "Invalid tile size: %d\n", tile_size);
105 return -1;
106 }
107
108 /* decode number of wavelet bands */
109 /* num_levels * 3 + 1 */
110 pic_conf.luma_bands = get_bits(&ctx->gb, 2) * 3 + 1;
111 pic_conf.chroma_bands = get_bits1(&ctx->gb) * 3 + 1;
112 ctx->is_scalable = pic_conf.luma_bands != 1 || pic_conf.chroma_bands != 1;
113 if (ctx->is_scalable && (pic_conf.luma_bands != 4 || pic_conf.chroma_bands != 1)) {
114 av_log(avctx, AV_LOG_ERROR, "Scalability: unsupported subdivision! Luma bands: %d, chroma bands: %d\n",
115 pic_conf.luma_bands, pic_conf.chroma_bands);
116 return -1;
117 }
118
119 pic_size_indx = get_bits(&ctx->gb, 4);
120 if (pic_size_indx == IVI5_PIC_SIZE_ESC) {
121 pic_conf.pic_height = get_bits(&ctx->gb, 13);
122 pic_conf.pic_width = get_bits(&ctx->gb, 13);
123 } else {
124 pic_conf.pic_height = ivi5_common_pic_sizes[pic_size_indx * 2 + 1] << 2;
125 pic_conf.pic_width = ivi5_common_pic_sizes[pic_size_indx * 2 ] << 2;
126 }
127
128 if (ctx->gop_flags & 2) {
129 av_log(avctx, AV_LOG_ERROR, "YV12 picture format not supported!\n");
130 return -1;
131 }
132
133 pic_conf.chroma_height = (pic_conf.pic_height + 3) >> 2;
134 pic_conf.chroma_width = (pic_conf.pic_width + 3) >> 2;
135
136 if (!tile_size) {
137 pic_conf.tile_height = pic_conf.pic_height;
138 pic_conf.tile_width = pic_conf.pic_width;
139 } else {
140 pic_conf.tile_height = pic_conf.tile_width = tile_size;
141 }
142
143 /* check if picture layout was changed and reallocate buffers */
144 if (ivi_pic_config_cmp(&pic_conf, &ctx->pic_conf)) {
145 result = ff_ivi_init_planes(ctx->planes, &pic_conf);
146 if (result) {
147 av_log(avctx, AV_LOG_ERROR, "Couldn't reallocate color planes!\n");
148 return -1;
149 }
150 ctx->pic_conf = pic_conf;
151 blk_size_changed = 1; /* force reallocation of the internal structures */
152 }
153
154 for (p = 0; p <= 1; p++) {
155 for (i = 0; i < (!p ? pic_conf.luma_bands : pic_conf.chroma_bands); i++) {
156 band = &ctx->planes[p].bands[i];
157
158 band->is_halfpel = get_bits1(&ctx->gb);
159
160 mb_size = get_bits1(&ctx->gb);
161 blk_size = 8 >> get_bits1(&ctx->gb);
162 mb_size = blk_size << !mb_size;
163
164 blk_size_changed = mb_size != band->mb_size || blk_size != band->blk_size;
165 if (blk_size_changed) {
166 band->mb_size = mb_size;
167 band->blk_size = blk_size;
168 }
169
170 if (get_bits1(&ctx->gb)) {
171 av_log(avctx, AV_LOG_ERROR, "Extended transform info encountered!\n");
172 return -1;
173 }
174
175 /* select transform function and scan pattern according to plane and band number */
176 switch ((p << 2) + i) {
177 case 0:
178 band->inv_transform = ff_ivi_inverse_slant_8x8;
179 band->dc_transform = ff_ivi_dc_slant_2d;
180 band->scan = ff_zigzag_direct;
181 break;
182
183 case 1:
184 band->inv_transform = ff_ivi_row_slant8;
185 band->dc_transform = ff_ivi_dc_row_slant;
186 band->scan = ivi5_scans8x8[0];
187 break;
188
189 case 2:
190 band->inv_transform = ff_ivi_col_slant8;
191 band->dc_transform = ff_ivi_dc_col_slant;
192 band->scan = ivi5_scans8x8[1];
193 break;
194
195 case 3:
196 band->inv_transform = ff_ivi_put_pixels_8x8;
197 band->dc_transform = ff_ivi_put_dc_pixel_8x8;
198 band->scan = ivi5_scans8x8[1];
199 break;
200
201 case 4:
202 band->inv_transform = ff_ivi_inverse_slant_4x4;
203 band->dc_transform = ff_ivi_dc_slant_2d;
204 band->scan = ivi5_scan4x4;
205 break;
206 }
207
208 band->is_2d_trans = band->inv_transform == ff_ivi_inverse_slant_8x8 ||
209 band->inv_transform == ff_ivi_inverse_slant_4x4;
210
211 /* select dequant matrix according to plane and band number */
212 if (!p) {
213 band->quant_mat = (pic_conf.luma_bands > 1) ? i+1 : 0;
214 } else {
215 band->quant_mat = 5;
216 }
217
218 if (get_bits(&ctx->gb, 2)) {
219 av_log(avctx, AV_LOG_ERROR, "End marker missing!\n");
220 return -1;
221 }
222 }
223 }
224
225 /* copy chroma parameters into the 2nd chroma plane */
226 for (i = 0; i < pic_conf.chroma_bands; i++) {
227 band1 = &ctx->planes[1].bands[i];
228 band2 = &ctx->planes[2].bands[i];
229
230 band2->width = band1->width;
231 band2->height = band1->height;
232 band2->mb_size = band1->mb_size;
233 band2->blk_size = band1->blk_size;
234 band2->is_halfpel = band1->is_halfpel;
235 band2->quant_mat = band1->quant_mat;
236 band2->scan = band1->scan;
237 band2->inv_transform = band1->inv_transform;
238 band2->dc_transform = band1->dc_transform;
239 band2->is_2d_trans = band1->is_2d_trans;
240 }
241
242 /* reallocate internal structures if needed */
243 if (blk_size_changed) {
244 result = ff_ivi_init_tiles(ctx->planes, pic_conf.tile_width,
245 pic_conf.tile_height);
246 if (result) {
247 av_log(avctx, AV_LOG_ERROR,
248 "Couldn't reallocate internal structures!\n");
249 return -1;
250 }
251 }
252
253 if (ctx->gop_flags & 8) {
254 if (get_bits(&ctx->gb, 3)) {
255 av_log(avctx, AV_LOG_ERROR, "Alignment bits are not zero!\n");
256 return -1;
257 }
258
259 if (get_bits1(&ctx->gb))
260 skip_bits_long(&ctx->gb, 24); /* skip transparency fill color */
261 }
262
263 align_get_bits(&ctx->gb);
264
265 skip_bits(&ctx->gb, 23); /* FIXME: unknown meaning */
266
267 /* skip GOP extension if any */
268 if (get_bits1(&ctx->gb)) {
269 do {
270 i = get_bits(&ctx->gb, 16);
271 } while (i & 0x8000);
272 }
273
274 align_get_bits(&ctx->gb);
275
276 return 0;
277 }
278
279
280 /**
281 * Skips a header extension.
282 *
283 * @param gb [in,out] the GetBit context
284 */
285 static inline void skip_hdr_extension(GetBitContext *gb)
286 {
287 int i, len;
288
289 do {
290 len = get_bits(gb, 8);
291 for (i = 0; i < len; i++) skip_bits(gb, 8);
292 } while(len);
293 }
294
295
296 /**
297 * Decodes Indeo5 picture header.
298 *
299 * @param ctx [in,out] ptr to the decoder context
300 * @param avctx [in] ptr to the AVCodecContext
301 * @return result code: 0 = OK, -1 = error
302 */
303 static int decode_pic_hdr(IVI5DecContext *ctx, AVCodecContext *avctx)
304 {
305 if (get_bits(&ctx->gb, 5) != 0x1F) {
306 av_log(avctx, AV_LOG_ERROR, "Invalid picture start code!\n");
307 return -1;
308 }
309
310 ctx->prev_frame_type = ctx->frame_type;
311 ctx->frame_type = get_bits(&ctx->gb, 3);
312 if (ctx->frame_type >= 5) {
313 av_log(avctx, AV_LOG_ERROR, "Invalid frame type: %d \n", ctx->frame_type);
314 return -1;
315 }
316
317 ctx->frame_num = get_bits(&ctx->gb, 8);
318
319 if (ctx->frame_type == FRAMETYPE_INTRA) {
320 if (decode_gop_header(ctx, avctx))
321 return -1;
322 }
323
324 if (ctx->frame_type != FRAMETYPE_NULL) {
325 ctx->frame_flags = get_bits(&ctx->gb, 8);
326
327 ctx->pic_hdr_size = (ctx->frame_flags & 1) ? get_bits_long(&ctx->gb, 24) : 0;
328
329 ctx->checksum = (ctx->frame_flags & 0x10) ? get_bits(&ctx->gb, 16) : 0;
330
331 /* skip unknown extension if any */
332 if (ctx->frame_flags & 0x20)
333 skip_hdr_extension(&ctx->gb); /* XXX: untested */
334
335 /* decode macroblock huffman codebook */
336 if (ff_ivi_dec_huff_desc(&ctx->gb, ctx->frame_flags & 0x40, IVI_MB_HUFF, &ctx->mb_vlc, avctx))
337 return -1;
338
339 skip_bits(&ctx->gb, 3); /* FIXME: unknown meaning! */
340 }
341
342 align_get_bits(&ctx->gb);
343
344 return 0;
345 }
346
347
348 /**
349 * Decodes Indeo5 band header.
350 *
351 * @param ctx [in,out] ptr to the decoder context
352 * @param band [in,out] ptr to the band descriptor
353 * @param avctx [in] ptr to the AVCodecContext
354 * @return result code: 0 = OK, -1 = error
355 */
356 static int decode_band_hdr(IVI5DecContext *ctx, IVIBandDesc *band,
357 AVCodecContext *avctx)
358 {
359 int i;
360 uint8_t band_flags;
361
362 band_flags = get_bits(&ctx->gb, 8);
363
364 if (band_flags & 1) {
365 band->is_empty = 1;
366 return 0;
367 }
368
369 band->data_size = (ctx->frame_flags & 0x80) ? get_bits_long(&ctx->gb, 24) : 0;
370
371 band->inherit_mv = band_flags & 2;
372 band->inherit_qdelta = band_flags & 8;
373 band->qdelta_present = band_flags & 4;
374 if (!band->qdelta_present) band->inherit_qdelta = 1;
375
376 /* decode rvmap probability corrections if any */
377 band->num_corr = 0; /* there are no corrections */
378 if (band_flags & 0x10) {
379 band->num_corr = get_bits(&ctx->gb, 8); /* get number of correction pairs */
380 if (band->num_corr > 61) {
381 av_log(avctx, AV_LOG_ERROR, "Too many corrections: %d\n",
382 band->num_corr);
383 return -1;
384 }
385
386 /* read correction pairs */
387 for (i = 0; i < band->num_corr * 2; i++)
388 band->corr[i] = get_bits(&ctx->gb, 8);
389 }
390
391 /* select appropriate rvmap table for this band */
392 band->rvmap_sel = (band_flags & 0x40) ? get_bits(&ctx->gb, 3) : 8;
393
394 /* decode block huffman codebook */
395 if (ff_ivi_dec_huff_desc(&ctx->gb, band_flags & 0x80, IVI_BLK_HUFF, &band->blk_vlc, avctx))
396 return -1;
397
398 band->checksum_present = get_bits1(&ctx->gb);
399 if (band->checksum_present)
400 band->checksum = get_bits(&ctx->gb, 16);
401
402 band->glob_quant = get_bits(&ctx->gb, 5);
403
404 /* skip unknown extension if any */
405 if (band_flags & 0x20) { /* XXX: untested */
406 align_get_bits(&ctx->gb);
407 skip_hdr_extension(&ctx->gb);
408 }
409
410 align_get_bits(&ctx->gb);
411
412 return 0;
413 }
414
415
416 /**
417 * Decodes info (block type, cbp, quant delta, motion vector)
418 * for all macroblocks in the current tile.
419 *
420 * @param ctx [in,out] ptr to the decoder context
421 * @param band [in,out] ptr to the band descriptor
422 * @param tile [in,out] ptr to the tile descriptor
423 * @param avctx [in] ptr to the AVCodecContext
424 * @return result code: 0 = OK, -1 = error
425 */
426 static int decode_mb_info(IVI5DecContext *ctx, IVIBandDesc *band,
427 IVITile *tile, AVCodecContext *avctx)
428 {
429 int x, y, mv_x, mv_y, mv_delta, offs, mb_offset,
430 mv_scale, blks_per_mb;
431 IVIMbInfo *mb, *ref_mb;
432 int row_offset = band->mb_size * band->pitch;
433
434 mb = tile->mbs;
435 ref_mb = tile->ref_mbs;
436 offs = tile->ypos * band->pitch + tile->xpos;
437
438 /* scale factor for motion vectors */
439 mv_scale = (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3);
440 mv_x = mv_y = 0;
441
442 for (y = tile->ypos; y < (tile->ypos + tile->height); y += band->mb_size) {
443 mb_offset = offs;
444
445 for (x = tile->xpos; x < (tile->xpos + tile->width); x += band->mb_size) {
446 mb->xpos = x;
447 mb->ypos = y;
448 mb->buf_offs = mb_offset;
449
450 if (get_bits1(&ctx->gb)) {
451 if (ctx->frame_type == FRAMETYPE_INTRA) {
452 av_log(avctx, AV_LOG_ERROR, "Empty macroblock in an INTRA picture!\n");
453 return -1;
454 }
455 mb->type = 1; /* empty macroblocks are always INTER */
456 mb->cbp = 0; /* all blocks are empty */
457
458 mb->q_delta = 0;
459 if (!band->plane && !band->band_num && (ctx->frame_flags & 8)) {
460 mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
461 IVI_VLC_BITS, 1);
462 mb->q_delta = IVI_TOSIGNED(mb->q_delta);
463 }
464
465 mb->mv_x = mb->mv_y = 0; /* no motion vector coded */
466 if (band->inherit_mv){
467 /* motion vector inheritance */
468 if (mv_scale) {
469 mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
470 mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
471 } else {
472 mb->mv_x = ref_mb->mv_x;
473 mb->mv_y = ref_mb->mv_y;
474 }
475 }
476 } else {
477 if (band->inherit_mv) {
478 mb->type = ref_mb->type; /* copy mb_type from corresponding reference mb */
479 } else if (ctx->frame_type == FRAMETYPE_INTRA) {
480 mb->type = 0; /* mb_type is always INTRA for intra-frames */
481 } else {
482 mb->type = get_bits1(&ctx->gb);
483 }
484
485 blks_per_mb = band->mb_size != band->blk_size ? 4 : 1;
486 mb->cbp = get_bits(&ctx->gb, blks_per_mb);
487
488 mb->q_delta = 0;
489 if (band->qdelta_present) {
490 if (band->inherit_qdelta) {
491 if (ref_mb) mb->q_delta = ref_mb->q_delta;
492 } else if (mb->cbp || (!band->plane && !band->band_num &&
493 (ctx->frame_flags & 8))) {
494 mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
495 IVI_VLC_BITS, 1);
496 mb->q_delta = IVI_TOSIGNED(mb->q_delta);
497 }
498 }
499
500 if (!mb->type) {
501 mb->mv_x = mb->mv_y = 0; /* there is no motion vector in intra-macroblocks */
502 } else {
503 if (band->inherit_mv){
504 /* motion vector inheritance */
505 if (mv_scale) {
506 mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
507 mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
508 } else {
509 mb->mv_x = ref_mb->mv_x;
510 mb->mv_y = ref_mb->mv_y;
511 }
512 } else {
513 /* decode motion vector deltas */
514 mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
515 IVI_VLC_BITS, 1);
516 mv_y += IVI_TOSIGNED(mv_delta);
517 mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
518 IVI_VLC_BITS, 1);
519 mv_x += IVI_TOSIGNED(mv_delta);
520 mb->mv_x = mv_x;
521 mb->mv_y = mv_y;
522 }
523 }
524 }
525
526 mb++;
527 if (ref_mb)
528 ref_mb++;
529 mb_offset += band->mb_size;
530 }
531
532 offs += row_offset;
533 }
534
535 align_get_bits(&ctx->gb);
536
537 return 0;
538 }
539
540
541 /**
542 * Decodes an Indeo5 band.
543 *
544 * @param ctx [in,out] ptr to the decoder context
545 * @param band [in,out] ptr to the band descriptor
546 * @param avctx [in] ptr to the AVCodecContext
547 * @return result code: 0 = OK, -1 = error
548 */
549 static int decode_band(IVI5DecContext *ctx, int plane_num,
550 IVIBandDesc *band, AVCodecContext *avctx)
551 {
552 int result, i, t, idx1, idx2, pos;
553 IVITile *tile;
554
555 band->buf = band->bufs[ctx->dst_buf];
556 band->ref_buf = band->bufs[ctx->ref_buf];
557 band->data_ptr = ctx->frame_data + (get_bits_count(&ctx->gb) >> 3);
558
559 result = decode_band_hdr(ctx, band, avctx);
560 if (result) {
561 av_log(avctx, AV_LOG_ERROR, "Error while decoding band header: %d\n",
562 result);
563 return -1;
564 }
565
566 if (band->is_empty) {
567 av_log(avctx, AV_LOG_ERROR, "Empty band encountered!\n");
568 return -1;
569 }
570
571 if (band->blk_size == 8) {
572 band->intra_base = &ivi5_base_quant_8x8_intra[band->quant_mat][0];
573 band->inter_base = &ivi5_base_quant_8x8_inter[band->quant_mat][0];
574 band->intra_scale = &ivi5_scale_quant_8x8_intra[band->quant_mat][0];
575 band->inter_scale = &ivi5_scale_quant_8x8_inter[band->quant_mat][0];
576 } else {
577 band->intra_base = ivi5_base_quant_4x4_intra;
578 band->inter_base = ivi5_base_quant_4x4_inter;
579 band->intra_scale = ivi5_scale_quant_4x4_intra;
580 band->inter_scale = ivi5_scale_quant_4x4_inter;
581 }
582
583 band->rv_map = &ctx->rvmap_tabs[band->rvmap_sel];
584
585 /* apply corrections to the selected rvmap table if present */
586 for (i = 0; i < band->num_corr; i++) {
587 idx1 = band->corr[i*2];
588 idx2 = band->corr[i*2+1];
589 FFSWAP(uint8_t, band->rv_map->runtab[idx1], band->rv_map->runtab[idx2]);
590 FFSWAP(int16_t, band->rv_map->valtab[idx1], band->rv_map->valtab[idx2]);
591 }
592
593 pos = get_bits_count(&ctx->gb);
594
595 for (t = 0; t < band->num_tiles; t++) {
596 tile = &band->tiles[t];
597
598 tile->is_empty = get_bits1(&ctx->gb);
599 if (tile->is_empty) {
600 ff_ivi_process_empty_tile(avctx, band, tile,
601 (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3));
602 } else {
603 tile->data_size = ff_ivi_dec_tile_data_size(&ctx->gb);
604
605 result = decode_mb_info(ctx, band, tile, avctx);
606 if (result < 0)
607 break;
608
609 result = ff_ivi_decode_blocks(&ctx->gb, band, tile);
610 if (result < 0 || (get_bits_count(&ctx->gb) - pos) >> 3 != tile->data_size) {
611 av_log(avctx, AV_LOG_ERROR, "Corrupted tile data encountered!\n");
612 break;
613 }
614 pos += tile->data_size << 3; // skip to next tile
615 }
616 }
617
618 /* restore the selected rvmap table by applying its corrections in reverse order */
619 for (i = band->num_corr-1; i >= 0; i--) {
620 idx1 = band->corr[i*2];
621 idx2 = band->corr[i*2+1];
622 FFSWAP(uint8_t, band->rv_map->runtab[idx1], band->rv_map->runtab[idx2]);
623 FFSWAP(int16_t, band->rv_map->valtab[idx1], band->rv_map->valtab[idx2]);
624 }
625
626 #if IVI_DEBUG
627 if (band->checksum_present) {
628 uint16_t chksum = ivi_calc_band_checksum(band);
629 if (chksum != band->checksum) {
630 av_log(avctx, AV_LOG_ERROR,
631 "Band checksum mismatch! Plane %d, band %d, received: %x, calculated: %x\n",
632 band->plane, band->band_num, band->checksum, chksum);
633 }
634 }
635 #endif
636
637 align_get_bits(&ctx->gb);
638
639 return result;
640 }
641
642
643 /**
644 * Switches buffers.
645 *
646 * @param ctx [in,out] ptr to the decoder context
647 * @param avctx [in] ptr to the AVCodecContext
648 */
649 static void switch_buffers(IVI5DecContext *ctx, AVCodecContext *avctx)
650 {
651 switch (ctx->frame_type) {
652 case FRAMETYPE_INTRA:
653 ctx->buf_switch = 0;
654 ctx->dst_buf = 0;
655 ctx->ref_buf = 0;
656 break;
657 case FRAMETYPE_INTER:
658 ctx->buf_switch &= 1;
659 /* swap buffers only if there were no droppable frames */
660 if (ctx->prev_frame_type != FRAMETYPE_INTER_NOREF &&
661 ctx->prev_frame_type != FRAMETYPE_INTER_SCAL)
662 ctx->buf_switch ^= 1;
663 ctx->dst_buf = ctx->buf_switch;
664 ctx->ref_buf = ctx->buf_switch ^ 1;
665 break;
666 case FRAMETYPE_INTER_SCAL:
667 if (ctx->prev_frame_type == FRAMETYPE_INTER_NOREF)
668 break;
669 if (ctx->prev_frame_type != FRAMETYPE_INTER_SCAL) {
670 ctx->buf_switch ^= 1;
671 ctx->dst_buf = ctx->buf_switch;
672 ctx->ref_buf = ctx->buf_switch ^ 1;
673 } else {
674 ctx->buf_switch ^= 2;
675 ctx->dst_buf = 2;
676 ctx->ref_buf = ctx->buf_switch & 1;
677 if (!(ctx->buf_switch & 2))
678 FFSWAP(int, ctx->dst_buf, ctx->ref_buf);
679 }
680 break;
681 case FRAMETYPE_INTER_NOREF:
682 if (ctx->prev_frame_type == FRAMETYPE_INTER_SCAL) {
683 ctx->buf_switch ^= 2;
684 ctx->dst_buf = 2;
685 ctx->ref_buf = ctx->buf_switch & 1;
686 if (!(ctx->buf_switch & 2))
687 FFSWAP(int, ctx->dst_buf, ctx->ref_buf);
688 } else {
689 ctx->buf_switch ^= 1;
690 ctx->dst_buf = ctx->buf_switch & 1;
691 ctx->ref_buf = (ctx->buf_switch & 1) ^ 1;
692 }
693 break;
694 case FRAMETYPE_NULL:
695 return;
696 default:
697 av_log(avctx, AV_LOG_ERROR, "unsupported frame type: %d\n", ctx->frame_type);
698 }
699 }
700
701
702 /**
703 * Initializes Indeo5 decoder.
704 */
705 static av_cold int decode_init(AVCodecContext *avctx)
706 {
707 IVI5DecContext *ctx = avctx->priv_data;
708 int result;
709
710 ff_ivi_init_static_vlc();
711
712 /* copy rvmap tables in our context so we can apply changes to them */
713 memcpy(ctx->rvmap_tabs, ff_ivi_rvmap_tabs, sizeof(ff_ivi_rvmap_tabs));
714
715 /* set the initial picture layout according to the basic profile:
716 there is only one band per plane (no scalability), only one tile (no local decoding)
717 and picture format = YVU9 */
718 ctx->pic_conf.pic_width = avctx->width;
719 ctx->pic_conf.pic_height = avctx->height;
720 ctx->pic_conf.chroma_width = (avctx->width + 3) >> 2;
721 ctx->pic_conf.chroma_height = (avctx->height + 3) >> 2;
722 ctx->pic_conf.tile_width = avctx->width;
723 ctx->pic_conf.tile_height = avctx->height;
724 ctx->pic_conf.luma_bands = ctx->pic_conf.chroma_bands = 1;
725
726 result = ff_ivi_init_planes(ctx->planes, &ctx->pic_conf);
727 if (result) {
728 av_log(avctx, AV_LOG_ERROR, "Couldn't allocate color planes!\n");
729 return -1;
730 }
731
732 avctx->pix_fmt = PIX_FMT_YUV410P;
733
734 return 0;
735 }
736
737
738 /**
739 * main decoder function
740 */
741 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
742 AVPacket *avpkt)
743 {
744 IVI5DecContext *ctx = avctx->priv_data;
745 const uint8_t *buf = avpkt->data;
746 int buf_size = avpkt->size;
747 int result, p, b;
748
749 init_get_bits(&ctx->gb, buf, buf_size * 8);
750 ctx->frame_data = buf;
751 ctx->frame_size = buf_size;
752
753 result = decode_pic_hdr(ctx, avctx);
754 if (result) {
755 av_log(avctx, AV_LOG_ERROR,
756 "Error while decoding picture header: %d\n", result);
757 return -1;
758 }
759
760 if (ctx->gop_flags & IVI5_IS_PROTECTED) {
761 av_log(avctx, AV_LOG_ERROR, "Password-protected clip!\n");
762 return -1;
763 }
764
765 switch_buffers(ctx, avctx);
766
767 //START_TIMER;
768
769 if (ctx->frame_type == FRAMETYPE_NULL) {
770 ctx->frame_type = ctx->prev_frame_type;
771 } else {
772 for (p = 0; p < 3; p++) {
773 for (b = 0; b < ctx->planes[p].num_bands; b++) {
774 result = decode_band(ctx, p, &ctx->planes[p].bands[b], avctx);
775 if (result) {
776 av_log(avctx, AV_LOG_ERROR,
777 "Error while decoding band: %d, plane: %d\n", b, p);
778 return -1;
779 }
780 }
781 }
782 }
783
784 //STOP_TIMER("decode_planes");
785
786 if (ctx->frame.data[0])
787 avctx->release_buffer(avctx, &ctx->frame);
788
789 ctx->frame.reference = 0;
790 if (avctx->get_buffer(avctx, &ctx->frame) < 0) {
791 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
792 return -1;
793 }
794
795 if (ctx->is_scalable) {
796 ff_ivi_recompose53 (&ctx->planes[0], ctx->frame.data[0], ctx->frame.linesize[0], 4);
797 } else {
798 ff_ivi_output_plane(&ctx->planes[0], ctx->frame.data[0], ctx->frame.linesize[0]);
799 }
800
801 ff_ivi_output_plane(&ctx->planes[2], ctx->frame.data[1], ctx->frame.linesize[1]);
802 ff_ivi_output_plane(&ctx->planes[1], ctx->frame.data[2], ctx->frame.linesize[2]);
803
804 *data_size = sizeof(AVFrame);
805 *(AVFrame*)data = ctx->frame;
806
807 return buf_size;
808 }
809
810
811 /**
812 * Closes Indeo5 decoder and cleans up its context.
813 */
814 static av_cold int decode_close(AVCodecContext *avctx)
815 {
816 IVI5DecContext *ctx = avctx->priv_data;
817
818 ff_ivi_free_buffers(&ctx->planes[0]);
819
820 if (ctx->mb_vlc.cust_tab.table)
821 free_vlc(&ctx->mb_vlc.cust_tab);
822
823 if (ctx->frame.data[0])
824 avctx->release_buffer(avctx, &ctx->frame);
825
826 return 0;
827 }
828
829
830 AVCodec indeo5_decoder = {
831 .name = "indeo5",
832 .type = CODEC_TYPE_VIDEO,
833 .id = CODEC_ID_INDEO5,
834 .priv_data_size = sizeof(IVI5DecContext),
835 .init = decode_init,
836 .close = decode_close,
837 .decode = decode_frame,
838 .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 5"),
839 };