Indeo 5 decoder
[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 "ivi_dsp.h"
34 #include "ivi_common.h"
35 #include "indeo5data.h"
36
37 /**
38 * Indeo5 frame types.
39 */
40 enum {
41 FRAMETYPE_INTRA = 0,
42 FRAMETYPE_INTER = 1, ///< non-droppable P-frame
43 FRAMETYPE_INTER_SCAL = 2, ///< droppable P-frame used in the scalability mode
44 FRAMETYPE_INTER_NOREF = 3, ///< droppable P-frame
45 FRAMETYPE_NULL = 4 ///< empty frame with no data
46 };
47
48 #define IVI5_PIC_SIZE_ESC 15
49
50 #define IVI5_IS_PROTECTED 0x20
51
52 typedef struct {
53 GetBitContext gb;
54 AVFrame frame;
55 RVMapDesc rvmap_tabs[9]; ///< local corrected copy of the static rvmap tables
56 IVIPlaneDesc planes[3]; ///< color planes
57 const uint8_t *frame_data; ///< input frame data pointer
58 int buf_switch; ///< used to switch between three buffers
59 int dst_buf;
60 int ref_buf;
61 uint32_t frame_size; ///< frame size in bytes
62 int frame_type;
63 int prev_frame_type; ///< frame type of the previous frame
64 int frame_num;
65 uint32_t pic_hdr_size; ///< picture header size in bytes
66 uint8_t frame_flags;
67 uint16_t checksum; ///< frame checksum
68
69 int16_t mb_huff_sel; ///< MB huffman table selector
70 IVIHuffDesc mb_huff_desc; ///< MB table descriptor associated with the selector above
71 VLC *mb_vlc; ///< ptr to the vlc table for decoding macroblock data
72 VLC mb_vlc_cust; ///< custom macroblock vlc table
73
74 uint16_t gop_hdr_size;
75 uint8_t gop_flags;
76 int is_scalable;
77 uint32_t lock_word;
78 IVIPicConfig pic_conf;
79 } IVI5DecContext;
80
81 //! static vlc tables (initialized at startup)
82 static VLC mb_vlc_tabs [8];
83 static VLC blk_vlc_tabs[8];
84
85
86 /**
87 * Decodes Indeo5 GOP (Group of pictures) header.
88 * This header is present in key frames only.
89 * It defines parameters for all frames in a GOP.
90 *
91 * @param ctx [in,out] ptr to the decoder context
92 * @param avctx [in] ptr to the AVCodecContext
93 * @return result code: 0 = OK, -1 = error
94 */
95 static int decode_gop_header(IVI5DecContext *ctx, AVCodecContext *avctx)
96 {
97 int result, i, p, tile_size, pic_size_indx, mb_size, blk_size, blk_size_changed = 0;
98 IVIBandDesc *band, *band1, *band2;
99 IVIPicConfig pic_conf;
100
101 ctx->gop_flags = get_bits(&ctx->gb, 8);
102
103 ctx->gop_hdr_size = (ctx->gop_flags & 1) ? get_bits(&ctx->gb, 16) : 0;
104
105 if (ctx->gop_flags & IVI5_IS_PROTECTED)
106 ctx->lock_word = get_bits_long(&ctx->gb, 32);
107
108 tile_size = (ctx->gop_flags & 0x40) ? 64 << get_bits(&ctx->gb, 2) : 0;
109 if (tile_size > 256) {
110 av_log(avctx, AV_LOG_ERROR, "Invalid tile size: %d\n", tile_size);
111 return -1;
112 }
113
114 /* decode number of wavelet bands */
115 /* num_levels * 3 + 1 */
116 pic_conf.luma_bands = get_bits(&ctx->gb, 2) * 3 + 1;
117 pic_conf.chroma_bands = get_bits1(&ctx->gb) * 3 + 1;
118 ctx->is_scalable = pic_conf.luma_bands != 1 || pic_conf.chroma_bands != 1;
119 if (ctx->is_scalable && (pic_conf.luma_bands != 4 || pic_conf.chroma_bands != 1)) {
120 av_log(avctx, AV_LOG_ERROR, "Scalability: unsupported subdivision! Luma bands: %d, chroma bands: %d\n",
121 pic_conf.luma_bands, pic_conf.chroma_bands);
122 return -1;
123 }
124
125 pic_size_indx = get_bits(&ctx->gb, 4);
126 if (pic_size_indx == IVI5_PIC_SIZE_ESC) {
127 pic_conf.pic_height = get_bits(&ctx->gb, 13);
128 pic_conf.pic_width = get_bits(&ctx->gb, 13);
129 } else {
130 pic_conf.pic_height = ivi5_common_pic_sizes[pic_size_indx * 2 + 1] << 2;
131 pic_conf.pic_width = ivi5_common_pic_sizes[pic_size_indx * 2 ] << 2;
132 }
133
134 if (ctx->gop_flags & 2) {
135 av_log(avctx, AV_LOG_ERROR, "YV12 picture format not supported!\n");
136 return -1;
137 }
138
139 pic_conf.chroma_height = (pic_conf.pic_height + 3) >> 2;
140 pic_conf.chroma_width = (pic_conf.pic_width + 3) >> 2;
141
142 if (!tile_size) {
143 pic_conf.tile_height = pic_conf.pic_height;
144 pic_conf.tile_width = pic_conf.pic_width;
145 } else {
146 pic_conf.tile_height = pic_conf.tile_width = tile_size;
147 }
148
149 /* check if picture layout was changed and reallocate buffers */
150 if (ivi_pic_config_cmp(&pic_conf, &ctx->pic_conf)) {
151 result = ff_ivi_init_planes(ctx->planes, &pic_conf);
152 if (result) {
153 av_log(avctx, AV_LOG_ERROR, "Couldn't reallocate color planes!\n");
154 return -1;
155 }
156 ctx->pic_conf = pic_conf;
157 blk_size_changed = 1; /* force reallocation of the internal structures */
158 }
159
160 for (p = 0; p <= 1; p++) {
161 for (i = 0; i < (!p ? pic_conf.luma_bands : pic_conf.chroma_bands); i++) {
162 band = &ctx->planes[p].bands[i];
163
164 band->is_halfpel = get_bits1(&ctx->gb);
165
166 mb_size = get_bits1(&ctx->gb);
167 blk_size = 8 >> get_bits1(&ctx->gb);
168 mb_size = blk_size << !mb_size;
169
170 blk_size_changed = mb_size != band->mb_size || blk_size != band->blk_size;
171 if (blk_size_changed) {
172 band->mb_size = mb_size;
173 band->blk_size = blk_size;
174 }
175
176 if (get_bits1(&ctx->gb)) {
177 av_log(avctx, AV_LOG_ERROR, "Extended transform info encountered!\n");
178 return -1;
179 }
180
181 /* select transform function and scan pattern according to plane and band number */
182 switch ((p << 2) + i) {
183 case 0:
184 band->inv_transform = ff_ivi_inverse_slant_8x8;
185 band->dc_transform = ff_ivi_dc_slant_2d;
186 band->scan = ivi5_scans8x8[0];
187 break;
188
189 case 1:
190 band->inv_transform = ff_ivi_row_slant8;
191 band->dc_transform = ff_ivi_dc_row_slant;
192 band->scan = ivi5_scans8x8[1];
193 break;
194
195 case 2:
196 band->inv_transform = ff_ivi_col_slant8;
197 band->dc_transform = ff_ivi_dc_col_slant;
198 band->scan = ivi5_scans8x8[2];
199 break;
200
201 case 3:
202 band->inv_transform = ff_ivi_put_pixels_8x8;
203 band->dc_transform = ff_ivi_put_dc_pixel_8x8;
204 band->scan = ivi5_scans8x8[2];
205 break;
206
207 case 4:
208 band->inv_transform = ff_ivi_inverse_slant_4x4;
209 band->dc_transform = ff_ivi_dc_slant_2d;
210 band->scan = ivi5_scan4x4;
211 break;
212 }
213
214 band->is_2d_trans = band->inv_transform == ff_ivi_inverse_slant_8x8 ||
215 band->inv_transform == ff_ivi_inverse_slant_4x4;
216
217 /* select dequant matrix according to plane and band number */
218 if (!p) {
219 band->quant_mat = (pic_conf.luma_bands > 1) ? i+1 : 0;
220 } else {
221 band->quant_mat = 5;
222 }
223
224 if (get_bits(&ctx->gb, 2)) {
225 av_log(avctx, AV_LOG_ERROR, "End marker missing!\n");
226 return -1;
227 }
228 }
229 }
230
231 /* copy chroma parameters into the 2nd chroma plane */
232 for (i = 0; i < pic_conf.chroma_bands; i++) {
233 band1 = &ctx->planes[1].bands[i];
234 band2 = &ctx->planes[2].bands[i];
235
236 band2->width = band1->width;
237 band2->height = band1->height;
238 band2->mb_size = band1->mb_size;
239 band2->blk_size = band1->blk_size;
240 band2->is_halfpel = band1->is_halfpel;
241 band2->quant_mat = band1->quant_mat;
242 band2->scan = band1->scan;
243 band2->inv_transform = band1->inv_transform;
244 band2->dc_transform = band1->dc_transform;
245 band2->is_2d_trans = band1->is_2d_trans;
246 }
247
248 /* reallocate internal structures if needed */
249 if (blk_size_changed) {
250 result = ff_ivi_init_tiles(ctx->planes, pic_conf.tile_width,
251 pic_conf.tile_height);
252 if (result) {
253 av_log(avctx, AV_LOG_ERROR,
254 "Couldn't reallocate internal structures!\n");
255 return -1;
256 }
257 }
258
259 if (ctx->gop_flags & 8) {
260 if (get_bits(&ctx->gb, 3)) {
261 av_log(avctx, AV_LOG_ERROR, "Alignment bits are not zero!\n");
262 return -1;
263 }
264
265 if (get_bits1(&ctx->gb))
266 skip_bits_long(&ctx->gb, 24); /* skip transparency fill color */
267 }
268
269 align_get_bits(&ctx->gb);
270
271 skip_bits(&ctx->gb, 23); /* FIXME: unknown meaning */
272
273 /* skip GOP extension if any */
274 if (get_bits1(&ctx->gb)) {
275 do {
276 i = get_bits(&ctx->gb, 16);
277 } while (i & 0x8000);
278 }
279
280 align_get_bits(&ctx->gb);
281
282 return 0;
283 }
284
285
286 /**
287 * Skips a header extension.
288 *
289 * @param gb [in,out] the GetBit context
290 */
291 static inline void skip_hdr_extension(GetBitContext *gb)
292 {
293 int i, len;
294
295 do {
296 len = get_bits(gb, 8);
297 for (i = 0; i < len; i++) skip_bits(gb, 8);
298 } while(len);
299 }
300
301
302 /**
303 * Decodes Indeo5 picture header.
304 *
305 * @param ctx [in,out] ptr to the decoder context
306 * @param avctx [in] ptr to the AVCodecContext
307 * @return result code: 0 = OK, -1 = error
308 */
309 static int decode_pic_hdr(IVI5DecContext *ctx, AVCodecContext *avctx)
310 {
311 int result;
312 IVIHuffDesc new_huff;
313
314 if (get_bits(&ctx->gb, 5) != 0x1F) {
315 av_log(avctx, AV_LOG_ERROR, "Invalid picture start code!\n");
316 return -1;
317 }
318
319 ctx->prev_frame_type = ctx->frame_type;
320 ctx->frame_type = get_bits(&ctx->gb, 3);
321 if (ctx->frame_type >= 5) {
322 av_log(avctx, AV_LOG_ERROR, "Invalid frame type: %d \n", ctx->frame_type);
323 return -1;
324 }
325
326 ctx->frame_num = get_bits(&ctx->gb, 8);
327
328 if (ctx->frame_type == FRAMETYPE_INTRA) {
329 if (decode_gop_header(ctx, avctx))
330 return -1;
331 }
332
333 if (ctx->frame_type != FRAMETYPE_NULL) {
334 ctx->frame_flags = get_bits(&ctx->gb, 8);
335
336 ctx->pic_hdr_size = (ctx->frame_flags & 1) ? get_bits_long(&ctx->gb, 24) : 0;
337
338 ctx->checksum = (ctx->frame_flags & 0x10) ? get_bits(&ctx->gb, 16) : 0;
339
340 /* skip unknown extension if any */
341 if (ctx->frame_flags & 0x20)
342 skip_hdr_extension(&ctx->gb); /* XXX: untested */
343
344 /* decode macroblock huffman codebook */
345 if (ctx->frame_flags & 0x40) {
346 ctx->mb_huff_sel = ff_ivi_dec_huff_desc(&ctx->gb, &new_huff);
347 if (ctx->mb_huff_sel != 7) {
348 ctx->mb_vlc = &mb_vlc_tabs[ctx->mb_huff_sel];
349 } else {
350 if (ff_ivi_huff_desc_cmp(&new_huff, &ctx->mb_huff_desc)) {
351 ff_ivi_huff_desc_copy(&ctx->mb_huff_desc, &new_huff);
352
353 if (ctx->mb_vlc_cust.table)
354 free_vlc(&ctx->mb_vlc_cust);
355 result = ff_ivi_create_huff_from_desc(&ctx->mb_huff_desc,
356 &ctx->mb_vlc_cust, 0);
357 if (result) {
358 av_log(avctx, AV_LOG_ERROR, "Error while initializing custom macroblock vlc table!\n");
359 return -1;
360 }
361 }
362 ctx->mb_vlc = &ctx->mb_vlc_cust;
363 }
364 } else {
365 ctx->mb_vlc = &mb_vlc_tabs[7]; /* select the default macroblock huffman table */
366 }
367
368 skip_bits(&ctx->gb, 3); /* FIXME: unknown meaning! */
369 }
370
371 align_get_bits(&ctx->gb);
372
373 return 0;
374 }
375
376
377 /**
378 * Decodes Indeo5 band header.
379 *
380 * @param ctx [in,out] ptr to the decoder context
381 * @param band [in,out] ptr to the band descriptor
382 * @param avctx [in] ptr to the AVCodecContext
383 * @return result code: 0 = OK, -1 = error
384 */
385 static int decode_band_hdr(IVI5DecContext *ctx, IVIBandDesc *band,
386 AVCodecContext *avctx)
387 {
388 int i, result;
389 uint8_t band_flags;
390 IVIHuffDesc new_huff;
391
392 band_flags = get_bits(&ctx->gb, 8);
393
394 if (band_flags & 1) {
395 band->is_empty = 1;
396 return 0;
397 }
398
399 band->data_size = (ctx->frame_flags & 0x80) ? get_bits_long(&ctx->gb, 24) : 0;
400
401 band->inherit_mv = band_flags & 2;
402 band->inherit_qdelta = band_flags & 8;
403 band->qdelta_present = band_flags & 4;
404 if (!band->qdelta_present) band->inherit_qdelta = 1;
405
406 /* decode rvmap probability corrections if any */
407 band->num_corr = 0; /* there are no corrections */
408 if (band_flags & 0x10) {
409 band->num_corr = get_bits(&ctx->gb, 8); /* get number of correction pairs */
410 if (band->num_corr > 61) {
411 av_log(avctx, AV_LOG_ERROR, "Too many corrections: %d\n",
412 band->num_corr);
413 return -1;
414 }
415
416 /* read correction pairs */
417 for (i = 0; i < band->num_corr * 2; i++)
418 band->corr[i] = get_bits(&ctx->gb, 8);
419 }
420
421 /* select appropriate rvmap table for this band */
422 band->rvmap_sel = (band_flags & 0x40) ? get_bits(&ctx->gb, 3) : 8;
423
424 /* decode block huffman codebook */
425 if (band_flags & 0x80) {
426 band->huff_sel = ff_ivi_dec_huff_desc(&ctx->gb, &new_huff);
427 if (band->huff_sel != 7) {
428 band->blk_vlc = &blk_vlc_tabs[band->huff_sel];
429 } else {
430 if (ff_ivi_huff_desc_cmp(&new_huff, &band->huff_desc)) {
431 ff_ivi_huff_desc_copy(&band->huff_desc, &new_huff);
432
433 if (band->blk_vlc_cust.table)
434 free_vlc(&band->blk_vlc_cust);
435 result = ff_ivi_create_huff_from_desc(&band->huff_desc,
436 &band->blk_vlc_cust, 0);
437 if (result) {
438 av_log(avctx, AV_LOG_ERROR, "Error while initializing custom block vlc table!\n");
439 return -1;
440 }
441 }
442 band->blk_vlc = &band->blk_vlc_cust;
443 }
444 } else {
445 band->blk_vlc = &blk_vlc_tabs[7]; /* select the default macroblock huffman table */
446 }
447
448 band->checksum_present = get_bits1(&ctx->gb);
449 if (band->checksum_present)
450 band->checksum = get_bits(&ctx->gb, 16);
451
452 band->glob_quant = get_bits(&ctx->gb, 5);
453
454 /* skip unknown extension if any */
455 if (band_flags & 0x20) { /* XXX: untested */
456 align_get_bits(&ctx->gb);
457 skip_hdr_extension(&ctx->gb);
458 }
459
460 align_get_bits(&ctx->gb);
461
462 return 0;
463 }
464
465
466 /**
467 * Decodes info (block type, cbp, quant delta, motion vector)
468 * for all macroblocks in the current tile.
469 *
470 * @param ctx [in,out] ptr to the decoder context
471 * @param band [in,out] ptr to the band descriptor
472 * @param tile [in,out] ptr to the tile descriptor
473 * @param avctx [in] ptr to the AVCodecContext
474 * @return result code: 0 = OK, -1 = error
475 */
476 static int decode_mb_info(IVI5DecContext *ctx, IVIBandDesc *band,
477 IVITile *tile, AVCodecContext *avctx)
478 {
479 int x, y, mv_x, mv_y, mv_delta, offs, mb_offset,
480 mv_scale, blks_per_mb;
481 IVIMbInfo *mb, *ref_mb;
482 int row_offset = band->mb_size * band->pitch;
483
484 mb = tile->mbs;
485 ref_mb = tile->ref_mbs;
486 offs = tile->ypos * band->pitch + tile->xpos;
487
488 /* scale factor for motion vectors */
489 mv_scale = (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3);
490 mv_x = mv_y = 0;
491
492 for (y = tile->ypos; y < (tile->ypos + tile->height); y += band->mb_size) {
493 mb_offset = offs;
494
495 for (x = tile->xpos; x < (tile->xpos + tile->width); x += band->mb_size) {
496 mb->xpos = x;
497 mb->ypos = y;
498 mb->buf_offs = mb_offset;
499
500 if (get_bits1(&ctx->gb)) {
501 if (ctx->frame_type == FRAMETYPE_INTRA) {
502 av_log(avctx, AV_LOG_ERROR, "Empty macroblock in an INTRA picture!\n");
503 return -1;
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->frame_flags & 8)) {
510 mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc->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){
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 mb->type = ref_mb->type; /* copy mb_type from corresponding reference mb */
529 } else if (ctx->frame_type == FRAMETYPE_INTRA) {
530 mb->type = 0; /* mb_type is always INTRA for intra-frames */
531 } else {
532 mb->type = get_bits1(&ctx->gb);
533 }
534
535 blks_per_mb = band->mb_size != band->blk_size ? 4 : 1;
536 mb->cbp = get_bits(&ctx->gb, blks_per_mb);
537
538 mb->q_delta = 0;
539 if (band->qdelta_present) {
540 if (band->inherit_qdelta) {
541 if (ref_mb) mb->q_delta = ref_mb->q_delta;
542 } else if (mb->cbp || (!band->plane && !band->band_num &&
543 (ctx->frame_flags & 8))) {
544 mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc->table,
545 IVI_VLC_BITS, 1);
546 mb->q_delta = IVI_TOSIGNED(mb->q_delta);
547 }
548 }
549
550 if (!mb->type) {
551 mb->mv_x = mb->mv_y = 0; /* there is no motion vector in intra-macroblocks */
552 } else {
553 if (band->inherit_mv){
554 /* motion vector inheritance */
555 if (mv_scale) {
556 mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
557 mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
558 } else {
559 mb->mv_x = ref_mb->mv_x;
560 mb->mv_y = ref_mb->mv_y;
561 }
562 } else {
563 /* decode motion vector deltas */
564 mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc->table,
565 IVI_VLC_BITS, 1);
566 mv_y += IVI_TOSIGNED(mv_delta);
567 mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc->table,
568 IVI_VLC_BITS, 1);
569 mv_x += IVI_TOSIGNED(mv_delta);
570 mb->mv_x = mv_x;
571 mb->mv_y = mv_y;
572 }
573 }
574 }
575
576 mb++;
577 if (ref_mb)
578 ref_mb++;
579 mb_offset += band->mb_size;
580 }
581
582 offs += row_offset;
583 }
584
585 align_get_bits(&ctx->gb);
586
587 return 0;
588 }
589
590
591 /**
592 * Decodes an Indeo5 band.
593 *
594 * @param ctx [in,out] ptr to the decoder context
595 * @param band [in,out] ptr to the band descriptor
596 * @param avctx [in] ptr to the AVCodecContext
597 * @return result code: 0 = OK, -1 = error
598 */
599 static int decode_band(IVI5DecContext *ctx, int plane_num,
600 IVIBandDesc *band, AVCodecContext *avctx)
601 {
602 int result, i, t, idx1, idx2;
603 IVITile *tile;
604 uint16_t chksum;
605
606 band->buf = band->bufs[ctx->dst_buf];
607 band->ref_buf = band->bufs[ctx->ref_buf];
608 band->data_ptr = ctx->frame_data + (get_bits_count(&ctx->gb) >> 3);
609
610 result = decode_band_hdr(ctx, band, avctx);
611 if (result) {
612 av_log(avctx, AV_LOG_ERROR, "Error while decoding band header: %d\n",
613 result);
614 return -1;
615 }
616
617 if (band->is_empty) {
618 av_log(avctx, AV_LOG_ERROR, "Empty band encountered!\n");
619 return -1;
620 }
621
622 band->rv_map = &ctx->rvmap_tabs[band->rvmap_sel];
623
624 /* apply corrections to the selected rvmap table if present */
625 for (i = 0; i < band->num_corr; i++) {
626 idx1 = band->corr[i*2];
627 idx2 = band->corr[i*2+1];
628 FFSWAP(uint8_t, band->rv_map->runtab[idx1], band->rv_map->runtab[idx2]);
629 FFSWAP(int16_t, band->rv_map->valtab[idx1], band->rv_map->valtab[idx2]);
630 }
631
632 for (t = 0; t < band->num_tiles; t++) {
633 tile = &band->tiles[t];
634
635 tile->is_empty = get_bits1(&ctx->gb);
636 if (tile->is_empty) {
637 ff_ivi_process_empty_tile(avctx, band, tile,
638 (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3));
639 align_get_bits(&ctx->gb);
640 } else {
641 tile->data_size = ff_ivi_dec_tile_data_size(&ctx->gb);
642
643 result = decode_mb_info(ctx, band, tile, avctx);
644 if (result < 0)
645 break;
646
647 if (band->blk_size == 8) {
648 band->intra_base = &ivi5_base_quant_8x8_intra[band->quant_mat][0];
649 band->inter_base = &ivi5_base_quant_8x8_inter[band->quant_mat][0];
650 band->intra_scale = &ivi5_scale_quant_8x8_intra[band->quant_mat][0];
651 band->inter_scale = &ivi5_scale_quant_8x8_inter[band->quant_mat][0];
652 } else {
653 band->intra_base = ivi5_base_quant_4x4_intra;
654 band->inter_base = ivi5_base_quant_4x4_inter;
655 band->intra_scale = ivi5_scale_quant_4x4_intra;
656 band->inter_scale = ivi5_scale_quant_4x4_inter;
657 }
658
659 result = ff_ivi_decode_blocks(&ctx->gb, band, tile);
660 if (result < 0) {
661 av_log(avctx, AV_LOG_ERROR, "Corrupted blocks data encountered!\n");
662 break;
663 }
664 }
665 }
666
667 /* restore the selected rvmap table by applying its corrections in reverse order */
668 for (i = band->num_corr-1; i >= 0; i--) {
669 idx1 = band->corr[i*2];
670 idx2 = band->corr[i*2+1];
671 FFSWAP(uint8_t, band->rv_map->runtab[idx1], band->rv_map->runtab[idx2]);
672 FFSWAP(int16_t, band->rv_map->valtab[idx1], band->rv_map->valtab[idx2]);
673 }
674
675 if (IVI_DEBUG && band->checksum_present) {
676 chksum = ivi_calc_band_checksum(band);
677 if (chksum != band->checksum) {
678 av_log(avctx, AV_LOG_ERROR,
679 "Band checksum mismatch! Plane %d, band %d, received: %x, calculated: %x\n",
680 band->plane, band->band_num, band->checksum, chksum);
681 }
682 }
683
684 return result;
685 }
686
687
688 /**
689 * Switches buffers.
690 *
691 * @param ctx [in,out] ptr to the decoder context
692 * @param avctx [in] ptr to the AVCodecContext
693 */
694 static void switch_buffers(IVI5DecContext *ctx, AVCodecContext *avctx)
695 {
696 switch (ctx->frame_type) {
697 case FRAMETYPE_INTRA:
698 ctx->buf_switch = 0;
699 ctx->dst_buf = 0;
700 ctx->ref_buf = 0;
701 break;
702 case FRAMETYPE_INTER:
703 ctx->buf_switch &= 1;
704 /* swap buffers only if there were no droppable frames */
705 if (ctx->prev_frame_type != FRAMETYPE_INTER_NOREF &&
706 ctx->prev_frame_type != FRAMETYPE_INTER_SCAL)
707 ctx->buf_switch ^= 1;
708 ctx->dst_buf = ctx->buf_switch;
709 ctx->ref_buf = ctx->buf_switch ^ 1;
710 break;
711 case FRAMETYPE_INTER_SCAL:
712 if (ctx->prev_frame_type == FRAMETYPE_INTER_NOREF)
713 break;
714 if (ctx->prev_frame_type != FRAMETYPE_INTER_SCAL) {
715 ctx->buf_switch ^= 1;
716 ctx->dst_buf = ctx->buf_switch;
717 ctx->ref_buf = ctx->buf_switch ^ 1;
718 } else {
719 ctx->buf_switch ^= 2;
720 ctx->dst_buf = 2;
721 ctx->ref_buf = ctx->buf_switch & 1;
722 if (!(ctx->buf_switch & 2))
723 FFSWAP(int, ctx->dst_buf, ctx->ref_buf);
724 }
725 break;
726 case FRAMETYPE_INTER_NOREF:
727 if (ctx->prev_frame_type == FRAMETYPE_INTER_SCAL) {
728 ctx->buf_switch ^= 2;
729 ctx->dst_buf = 2;
730 ctx->ref_buf = ctx->buf_switch & 1;
731 if (!(ctx->buf_switch & 2))
732 FFSWAP(int, ctx->dst_buf, ctx->ref_buf);
733 } else {
734 ctx->buf_switch ^= 1;
735 ctx->dst_buf = ctx->buf_switch & 1;
736 ctx->ref_buf = (ctx->buf_switch & 1) ^ 1;
737 }
738 break;
739 case FRAMETYPE_NULL:
740 return;
741 default:
742 av_log(avctx, AV_LOG_ERROR, "unsupported frame type: %d\n", ctx->frame_type);
743 }
744 }
745
746
747 /**
748 * Initializes Indeo5 decoder.
749 */
750 static av_cold int decode_init(AVCodecContext *avctx)
751 {
752 IVI5DecContext *ctx = avctx->priv_data;
753 int i, result;
754
755 /* initialize static vlc tables for macroblock/block signals */
756 for (i = 0; i < 8; i++) {
757 ff_ivi_create_huff_from_desc(&ff_ivi_mb_huff_desc[i], &mb_vlc_tabs[i], 1);
758 ff_ivi_create_huff_from_desc(&ff_ivi_blk_huff_desc[i], &blk_vlc_tabs[i], 1);
759 }
760
761 /* copy rvmap tables in our context so we can apply changes to them */
762 memcpy(ctx->rvmap_tabs, ff_ivi_rvmap_tabs, sizeof(ff_ivi_rvmap_tabs));
763
764 /* set the initial picture layout according to the basic profile:
765 there is only one band per plane (no scalability), only one tile (no local decoding)
766 and picture format = YVU9 */
767 ctx->pic_conf.pic_width = avctx->width;
768 ctx->pic_conf.pic_height = avctx->height;
769 ctx->pic_conf.chroma_width = (avctx->width + 3) >> 2;
770 ctx->pic_conf.chroma_height = (avctx->height + 3) >> 2;
771 ctx->pic_conf.tile_width = avctx->width;
772 ctx->pic_conf.tile_height = avctx->height;
773 ctx->pic_conf.luma_bands = ctx->pic_conf.chroma_bands = 1;
774
775 result = ff_ivi_init_planes(ctx->planes, &ctx->pic_conf);
776 if (result) {
777 av_log(avctx, AV_LOG_ERROR, "Couldn't allocate color planes!\n");
778 return -1;
779 }
780
781 avctx->pix_fmt = PIX_FMT_YUV410P;
782
783 return 0;
784 }
785
786
787 /**
788 * main decoder function
789 */
790 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
791 AVPacket *avpkt)
792 {
793 IVI5DecContext *ctx = avctx->priv_data;
794 const uint8_t *buf = avpkt->data;
795 int buf_size = avpkt->size;
796 int result, p, b;
797
798 init_get_bits(&ctx->gb, buf, buf_size * 8);
799 ctx->frame_data = buf;
800 ctx->frame_size = buf_size;
801
802 result = decode_pic_hdr(ctx, avctx);
803 if (result) {
804 av_log(avctx, AV_LOG_ERROR,
805 "Error while decoding picture header: %d\n", result);
806 return -1;
807 }
808
809 if (ctx->gop_flags & IVI5_IS_PROTECTED) {
810 av_log(avctx, AV_LOG_ERROR, "Password-protected clip!\n");
811 return -1;
812 }
813
814 switch_buffers(ctx, avctx);
815
816 //START_TIMER;
817
818 if (ctx->frame_type == FRAMETYPE_NULL) {
819 ctx->frame_type = ctx->prev_frame_type;
820 } else {
821 for (p = 0; p < 3; p++) {
822 for (b = 0; b < ctx->planes[p].num_bands; b++) {
823 result = decode_band(ctx, p, &ctx->planes[p].bands[b], avctx);
824 if (result) {
825 av_log(avctx, AV_LOG_ERROR,
826 "Error while decoding band: %d, plane: %d\n", b, p);
827 return -1;
828 }
829 }
830 }
831 }
832
833 //STOP_TIMER("decode_planes");
834
835 if (ctx->frame.data[0])
836 avctx->release_buffer(avctx, &ctx->frame);
837
838 ctx->frame.reference = 0;
839 if (avctx->get_buffer(avctx, &ctx->frame) < 0) {
840 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
841 return -1;
842 }
843
844 if (ctx->is_scalable) {
845 ff_ivi_recompose53 (&ctx->planes[0], ctx->frame.data[0], ctx->frame.linesize[0], 4);
846 } else {
847 ff_ivi_output_plane(&ctx->planes[0], ctx->frame.data[0], ctx->frame.linesize[0]);
848 }
849
850 ff_ivi_output_plane(&ctx->planes[2], ctx->frame.data[1], ctx->frame.linesize[1]);
851 ff_ivi_output_plane(&ctx->planes[1], ctx->frame.data[2], ctx->frame.linesize[2]);
852
853 *data_size = sizeof(AVFrame);
854 *(AVFrame*)data = ctx->frame;
855
856 return buf_size;
857 }
858
859
860 /**
861 * Closes Indeo5 decoder and cleans up its context.
862 */
863 static av_cold int decode_close(AVCodecContext *avctx)
864 {
865 IVI5DecContext *ctx = avctx->priv_data;
866
867 ff_ivi_free_buffers(&ctx->planes[0]);
868
869 if (ctx->frame.data[0])
870 avctx->release_buffer(avctx, &ctx->frame);
871
872 return 0;
873 }
874
875
876 AVCodec indeo5_decoder = {
877 .name = "indeo5",
878 .type = CODEC_TYPE_VIDEO,
879 .id = CODEC_ID_INDEO5,
880 .priv_data_size = sizeof(IVI5DecContext),
881 .init = decode_init,
882 .close = decode_close,
883 .decode = decode_frame,
884 .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 5"),
885 };