6779e1a54404aacbf1ec89b7aa37bc6411d8f1a1
[libav.git] / libavcodec / utils.c
1 /*
2 * utils for libavcodec
3 * Copyright (c) 2001 Fabrice Bellard
4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5 *
6 * This file is part of Libav.
7 *
8 * Libav is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * Libav is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 /**
24 * @file
25 * utils.
26 */
27
28 #include "config.h"
29 #include "libavutil/attributes.h"
30 #include "libavutil/avassert.h"
31 #include "libavutil/avstring.h"
32 #include "libavutil/channel_layout.h"
33 #include "libavutil/crc.h"
34 #include "libavutil/frame.h"
35 #include "libavutil/internal.h"
36 #include "libavutil/mathematics.h"
37 #include "libavutil/pixdesc.h"
38 #include "libavutil/imgutils.h"
39 #include "libavutil/samplefmt.h"
40 #include "libavutil/dict.h"
41 #include "avcodec.h"
42 #include "libavutil/opt.h"
43 #include "me_cmp.h"
44 #include "mpegvideo.h"
45 #include "thread.h"
46 #include "internal.h"
47 #include "bytestream.h"
48 #include "version.h"
49 #include <stdlib.h>
50 #include <stdarg.h>
51 #include <limits.h>
52 #include <float.h>
53
54 static int volatile entangled_thread_counter = 0;
55 static int (*lockmgr_cb)(void **mutex, enum AVLockOp op);
56 static void *codec_mutex;
57 static void *avformat_mutex;
58
59 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
60 {
61 void **p = ptr;
62 if (min_size > SIZE_MAX - AV_INPUT_BUFFER_PADDING_SIZE) {
63 av_freep(p);
64 *size = 0;
65 return;
66 }
67 av_fast_malloc(p, size, min_size + AV_INPUT_BUFFER_PADDING_SIZE);
68 if (*size)
69 memset((uint8_t *)*p + min_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
70 }
71
72 /* encoder management */
73 static AVCodec *first_avcodec = NULL;
74
75 AVCodec *av_codec_next(const AVCodec *c)
76 {
77 if (c)
78 return c->next;
79 else
80 return first_avcodec;
81 }
82
83 static av_cold void avcodec_init(void)
84 {
85 static int initialized = 0;
86
87 if (initialized != 0)
88 return;
89 initialized = 1;
90
91 if (CONFIG_ME_CMP)
92 ff_me_cmp_init_static();
93 }
94
95 int av_codec_is_encoder(const AVCodec *codec)
96 {
97 return codec && (codec->encode_sub || codec->encode2);
98 }
99
100 int av_codec_is_decoder(const AVCodec *codec)
101 {
102 return codec && codec->decode;
103 }
104
105 av_cold void avcodec_register(AVCodec *codec)
106 {
107 AVCodec **p;
108 avcodec_init();
109 p = &first_avcodec;
110 while (*p)
111 p = &(*p)->next;
112 *p = codec;
113 codec->next = NULL;
114
115 if (codec->init_static_data)
116 codec->init_static_data(codec);
117 }
118
119 #if FF_API_EMU_EDGE
120 unsigned avcodec_get_edge_width(void)
121 {
122 return EDGE_WIDTH;
123 }
124 #endif
125
126 #if FF_API_SET_DIMENSIONS
127 void avcodec_set_dimensions(AVCodecContext *s, int width, int height)
128 {
129 ff_set_dimensions(s, width, height);
130 }
131 #endif
132
133 int ff_set_dimensions(AVCodecContext *s, int width, int height)
134 {
135 int ret = av_image_check_size(width, height, 0, s);
136
137 if (ret < 0)
138 width = height = 0;
139 s->width = s->coded_width = width;
140 s->height = s->coded_height = height;
141
142 return ret;
143 }
144
145 int ff_set_sar(AVCodecContext *avctx, AVRational sar)
146 {
147 int ret = av_image_check_sar(avctx->width, avctx->height, sar);
148
149 if (ret < 0) {
150 av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %d/%d\n",
151 sar.num, sar.den);
152 avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
153 return ret;
154 } else {
155 avctx->sample_aspect_ratio = sar;
156 }
157 return 0;
158 }
159
160 int ff_side_data_update_matrix_encoding(AVFrame *frame,
161 enum AVMatrixEncoding matrix_encoding)
162 {
163 AVFrameSideData *side_data;
164 enum AVMatrixEncoding *data;
165
166 side_data = av_frame_get_side_data(frame, AV_FRAME_DATA_MATRIXENCODING);
167 if (!side_data)
168 side_data = av_frame_new_side_data(frame, AV_FRAME_DATA_MATRIXENCODING,
169 sizeof(enum AVMatrixEncoding));
170
171 if (!side_data)
172 return AVERROR(ENOMEM);
173
174 data = (enum AVMatrixEncoding*)side_data->data;
175 *data = matrix_encoding;
176
177 return 0;
178 }
179
180 #if HAVE_SIMD_ALIGN_16
181 # define STRIDE_ALIGN 16
182 #else
183 # define STRIDE_ALIGN 8
184 #endif
185
186 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
187 int linesize_align[AV_NUM_DATA_POINTERS])
188 {
189 int i;
190 int w_align = 1;
191 int h_align = 1;
192
193 switch (s->pix_fmt) {
194 case AV_PIX_FMT_YUV420P:
195 case AV_PIX_FMT_YUYV422:
196 case AV_PIX_FMT_YVYU422:
197 case AV_PIX_FMT_UYVY422:
198 case AV_PIX_FMT_YUV422P:
199 case AV_PIX_FMT_YUV440P:
200 case AV_PIX_FMT_YUV444P:
201 case AV_PIX_FMT_GBRP:
202 case AV_PIX_FMT_GBRAP:
203 case AV_PIX_FMT_GRAY8:
204 case AV_PIX_FMT_GRAY16BE:
205 case AV_PIX_FMT_GRAY16LE:
206 case AV_PIX_FMT_YUVJ420P:
207 case AV_PIX_FMT_YUVJ422P:
208 case AV_PIX_FMT_YUVJ440P:
209 case AV_PIX_FMT_YUVJ444P:
210 case AV_PIX_FMT_YUVA420P:
211 case AV_PIX_FMT_YUVA422P:
212 case AV_PIX_FMT_YUVA444P:
213 case AV_PIX_FMT_YUV420P9LE:
214 case AV_PIX_FMT_YUV420P9BE:
215 case AV_PIX_FMT_YUV420P10LE:
216 case AV_PIX_FMT_YUV420P10BE:
217 case AV_PIX_FMT_YUV422P9LE:
218 case AV_PIX_FMT_YUV422P9BE:
219 case AV_PIX_FMT_YUV422P10LE:
220 case AV_PIX_FMT_YUV422P10BE:
221 case AV_PIX_FMT_YUVA422P10LE:
222 case AV_PIX_FMT_YUVA422P10BE:
223 case AV_PIX_FMT_YUV444P9LE:
224 case AV_PIX_FMT_YUV444P9BE:
225 case AV_PIX_FMT_YUV444P10LE:
226 case AV_PIX_FMT_YUV444P10BE:
227 case AV_PIX_FMT_YUVA444P10LE:
228 case AV_PIX_FMT_YUVA444P10BE:
229 case AV_PIX_FMT_GBRP9LE:
230 case AV_PIX_FMT_GBRP9BE:
231 case AV_PIX_FMT_GBRP10LE:
232 case AV_PIX_FMT_GBRP10BE:
233 w_align = 16; //FIXME assume 16 pixel per macroblock
234 h_align = 16 * 2; // interlaced needs 2 macroblocks height
235 break;
236 case AV_PIX_FMT_YUV411P:
237 case AV_PIX_FMT_UYYVYY411:
238 w_align = 32;
239 h_align = 8;
240 break;
241 case AV_PIX_FMT_YUV410P:
242 if (s->codec_id == AV_CODEC_ID_SVQ1) {
243 w_align = 64;
244 h_align = 64;
245 }
246 case AV_PIX_FMT_RGB555:
247 if (s->codec_id == AV_CODEC_ID_RPZA) {
248 w_align = 4;
249 h_align = 4;
250 }
251 case AV_PIX_FMT_PAL8:
252 case AV_PIX_FMT_BGR8:
253 case AV_PIX_FMT_RGB8:
254 if (s->codec_id == AV_CODEC_ID_SMC) {
255 w_align = 4;
256 h_align = 4;
257 }
258 break;
259 case AV_PIX_FMT_BGR24:
260 if ((s->codec_id == AV_CODEC_ID_MSZH) ||
261 (s->codec_id == AV_CODEC_ID_ZLIB)) {
262 w_align = 4;
263 h_align = 4;
264 }
265 break;
266 default:
267 w_align = 1;
268 h_align = 1;
269 break;
270 }
271
272 *width = FFALIGN(*width, w_align);
273 *height = FFALIGN(*height, h_align);
274 if (s->codec_id == AV_CODEC_ID_H264)
275 // some of the optimized chroma MC reads one line too much
276 *height += 2;
277
278 for (i = 0; i < 4; i++)
279 linesize_align[i] = STRIDE_ALIGN;
280 }
281
282 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)
283 {
284 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);
285 int chroma_shift = desc->log2_chroma_w;
286 int linesize_align[AV_NUM_DATA_POINTERS];
287 int align;
288
289 avcodec_align_dimensions2(s, width, height, linesize_align);
290 align = FFMAX(linesize_align[0], linesize_align[3]);
291 linesize_align[1] <<= chroma_shift;
292 linesize_align[2] <<= chroma_shift;
293 align = FFMAX3(align, linesize_align[1], linesize_align[2]);
294 *width = FFALIGN(*width, align);
295 }
296
297 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
298 enum AVSampleFormat sample_fmt, const uint8_t *buf,
299 int buf_size, int align)
300 {
301 int ch, planar, needed_size, ret = 0;
302
303 needed_size = av_samples_get_buffer_size(NULL, nb_channels,
304 frame->nb_samples, sample_fmt,
305 align);
306 if (buf_size < needed_size)
307 return AVERROR(EINVAL);
308
309 planar = av_sample_fmt_is_planar(sample_fmt);
310 if (planar && nb_channels > AV_NUM_DATA_POINTERS) {
311 if (!(frame->extended_data = av_mallocz(nb_channels *
312 sizeof(*frame->extended_data))))
313 return AVERROR(ENOMEM);
314 } else {
315 frame->extended_data = frame->data;
316 }
317
318 if ((ret = av_samples_fill_arrays(frame->extended_data, &frame->linesize[0],
319 buf, nb_channels, frame->nb_samples,
320 sample_fmt, align)) < 0) {
321 if (frame->extended_data != frame->data)
322 av_free(frame->extended_data);
323 return ret;
324 }
325 if (frame->extended_data != frame->data) {
326 for (ch = 0; ch < AV_NUM_DATA_POINTERS; ch++)
327 frame->data[ch] = frame->extended_data[ch];
328 }
329
330 return ret;
331 }
332
333 static int update_frame_pool(AVCodecContext *avctx, AVFrame *frame)
334 {
335 FramePool *pool = avctx->internal->pool;
336 int i, ret;
337
338 switch (avctx->codec_type) {
339 case AVMEDIA_TYPE_VIDEO: {
340 AVPicture picture;
341 int size[4] = { 0 };
342 int w = frame->width;
343 int h = frame->height;
344 int tmpsize, unaligned;
345
346 if (pool->format == frame->format &&
347 pool->width == frame->width && pool->height == frame->height)
348 return 0;
349
350 avcodec_align_dimensions2(avctx, &w, &h, pool->stride_align);
351
352 do {
353 // NOTE: do not align linesizes individually, this breaks e.g. assumptions
354 // that linesize[0] == 2*linesize[1] in the MPEG-encoder for 4:2:2
355 av_image_fill_linesizes(picture.linesize, avctx->pix_fmt, w);
356 // increase alignment of w for next try (rhs gives the lowest bit set in w)
357 w += w & ~(w - 1);
358
359 unaligned = 0;
360 for (i = 0; i < 4; i++)
361 unaligned |= picture.linesize[i] % pool->stride_align[i];
362 } while (unaligned);
363
364 tmpsize = av_image_fill_pointers(picture.data, avctx->pix_fmt, h,
365 NULL, picture.linesize);
366 if (tmpsize < 0)
367 return -1;
368
369 for (i = 0; i < 3 && picture.data[i + 1]; i++)
370 size[i] = picture.data[i + 1] - picture.data[i];
371 size[i] = tmpsize - (picture.data[i] - picture.data[0]);
372
373 for (i = 0; i < 4; i++) {
374 av_buffer_pool_uninit(&pool->pools[i]);
375 pool->linesize[i] = picture.linesize[i];
376 if (size[i]) {
377 pool->pools[i] = av_buffer_pool_init(size[i] + 16, NULL);
378 if (!pool->pools[i]) {
379 ret = AVERROR(ENOMEM);
380 goto fail;
381 }
382 }
383 }
384 pool->format = frame->format;
385 pool->width = frame->width;
386 pool->height = frame->height;
387
388 break;
389 }
390 case AVMEDIA_TYPE_AUDIO: {
391 int ch = av_get_channel_layout_nb_channels(frame->channel_layout);
392 int planar = av_sample_fmt_is_planar(frame->format);
393 int planes = planar ? ch : 1;
394
395 if (pool->format == frame->format && pool->planes == planes &&
396 pool->channels == ch && frame->nb_samples == pool->samples)
397 return 0;
398
399 av_buffer_pool_uninit(&pool->pools[0]);
400 ret = av_samples_get_buffer_size(&pool->linesize[0], ch,
401 frame->nb_samples, frame->format, 0);
402 if (ret < 0)
403 goto fail;
404
405 pool->pools[0] = av_buffer_pool_init(pool->linesize[0], NULL);
406 if (!pool->pools[0]) {
407 ret = AVERROR(ENOMEM);
408 goto fail;
409 }
410
411 pool->format = frame->format;
412 pool->planes = planes;
413 pool->channels = ch;
414 pool->samples = frame->nb_samples;
415 break;
416 }
417 default: av_assert0(0);
418 }
419 return 0;
420 fail:
421 for (i = 0; i < 4; i++)
422 av_buffer_pool_uninit(&pool->pools[i]);
423 pool->format = -1;
424 pool->planes = pool->channels = pool->samples = 0;
425 pool->width = pool->height = 0;
426 return ret;
427 }
428
429 static int audio_get_buffer(AVCodecContext *avctx, AVFrame *frame)
430 {
431 FramePool *pool = avctx->internal->pool;
432 int planes = pool->planes;
433 int i;
434
435 frame->linesize[0] = pool->linesize[0];
436
437 if (planes > AV_NUM_DATA_POINTERS) {
438 frame->extended_data = av_mallocz(planes * sizeof(*frame->extended_data));
439 frame->nb_extended_buf = planes - AV_NUM_DATA_POINTERS;
440 frame->extended_buf = av_mallocz(frame->nb_extended_buf *
441 sizeof(*frame->extended_buf));
442 if (!frame->extended_data || !frame->extended_buf) {
443 av_freep(&frame->extended_data);
444 av_freep(&frame->extended_buf);
445 return AVERROR(ENOMEM);
446 }
447 } else
448 frame->extended_data = frame->data;
449
450 for (i = 0; i < FFMIN(planes, AV_NUM_DATA_POINTERS); i++) {
451 frame->buf[i] = av_buffer_pool_get(pool->pools[0]);
452 if (!frame->buf[i])
453 goto fail;
454 frame->extended_data[i] = frame->data[i] = frame->buf[i]->data;
455 }
456 for (i = 0; i < frame->nb_extended_buf; i++) {
457 frame->extended_buf[i] = av_buffer_pool_get(pool->pools[0]);
458 if (!frame->extended_buf[i])
459 goto fail;
460 frame->extended_data[i + AV_NUM_DATA_POINTERS] = frame->extended_buf[i]->data;
461 }
462
463 if (avctx->debug & FF_DEBUG_BUFFERS)
464 av_log(avctx, AV_LOG_DEBUG, "default_get_buffer called on frame %p", frame);
465
466 return 0;
467 fail:
468 av_frame_unref(frame);
469 return AVERROR(ENOMEM);
470 }
471
472 static int video_get_buffer(AVCodecContext *s, AVFrame *pic)
473 {
474 FramePool *pool = s->internal->pool;
475 int i;
476
477 if (pic->data[0]) {
478 av_log(s, AV_LOG_ERROR, "pic->data[0]!=NULL in avcodec_default_get_buffer\n");
479 return -1;
480 }
481
482 memset(pic->data, 0, sizeof(pic->data));
483 pic->extended_data = pic->data;
484
485 for (i = 0; i < 4 && pool->pools[i]; i++) {
486 pic->linesize[i] = pool->linesize[i];
487
488 pic->buf[i] = av_buffer_pool_get(pool->pools[i]);
489 if (!pic->buf[i])
490 goto fail;
491
492 pic->data[i] = pic->buf[i]->data;
493 }
494 for (; i < AV_NUM_DATA_POINTERS; i++) {
495 pic->data[i] = NULL;
496 pic->linesize[i] = 0;
497 }
498 if (pic->data[1] && !pic->data[2])
499 avpriv_set_systematic_pal2((uint32_t *)pic->data[1], s->pix_fmt);
500
501 if (s->debug & FF_DEBUG_BUFFERS)
502 av_log(s, AV_LOG_DEBUG, "default_get_buffer called on pic %p\n", pic);
503
504 return 0;
505 fail:
506 av_frame_unref(pic);
507 return AVERROR(ENOMEM);
508 }
509
510 int avcodec_default_get_buffer2(AVCodecContext *avctx, AVFrame *frame, int flags)
511 {
512 int ret;
513
514 if ((ret = update_frame_pool(avctx, frame)) < 0)
515 return ret;
516
517 #if FF_API_GET_BUFFER
518 FF_DISABLE_DEPRECATION_WARNINGS
519 frame->type = FF_BUFFER_TYPE_INTERNAL;
520 FF_ENABLE_DEPRECATION_WARNINGS
521 #endif
522
523 switch (avctx->codec_type) {
524 case AVMEDIA_TYPE_VIDEO:
525 return video_get_buffer(avctx, frame);
526 case AVMEDIA_TYPE_AUDIO:
527 return audio_get_buffer(avctx, frame);
528 default:
529 return -1;
530 }
531 }
532
533 #if FF_API_GET_BUFFER
534 FF_DISABLE_DEPRECATION_WARNINGS
535 int avcodec_default_get_buffer(AVCodecContext *avctx, AVFrame *frame)
536 {
537 return avcodec_default_get_buffer2(avctx, frame, 0);
538 }
539
540 typedef struct CompatReleaseBufPriv {
541 AVCodecContext avctx;
542 AVFrame frame;
543 } CompatReleaseBufPriv;
544
545 static void compat_free_buffer(void *opaque, uint8_t *data)
546 {
547 CompatReleaseBufPriv *priv = opaque;
548 if (priv->avctx.release_buffer)
549 priv->avctx.release_buffer(&priv->avctx, &priv->frame);
550 av_freep(&priv);
551 }
552
553 static void compat_release_buffer(void *opaque, uint8_t *data)
554 {
555 AVBufferRef *buf = opaque;
556 av_buffer_unref(&buf);
557 }
558 FF_ENABLE_DEPRECATION_WARNINGS
559 #endif
560
561 int ff_decode_frame_props(AVCodecContext *avctx, AVFrame *frame)
562 {
563 AVPacket *pkt = avctx->internal->pkt;
564 int i;
565 struct {
566 enum AVPacketSideDataType packet;
567 enum AVFrameSideDataType frame;
568 } sd[] = {
569 { AV_PKT_DATA_REPLAYGAIN , AV_FRAME_DATA_REPLAYGAIN },
570 { AV_PKT_DATA_DISPLAYMATRIX, AV_FRAME_DATA_DISPLAYMATRIX },
571 { AV_PKT_DATA_STEREO3D, AV_FRAME_DATA_STEREO3D },
572 { AV_PKT_DATA_AUDIO_SERVICE_TYPE, AV_FRAME_DATA_AUDIO_SERVICE_TYPE },
573 };
574
575 frame->color_primaries = avctx->color_primaries;
576 frame->color_trc = avctx->color_trc;
577 frame->colorspace = avctx->colorspace;
578 frame->color_range = avctx->color_range;
579 frame->chroma_location = avctx->chroma_sample_location;
580
581 frame->reordered_opaque = avctx->reordered_opaque;
582 if (!pkt) {
583 frame->pkt_pts = AV_NOPTS_VALUE;
584 return 0;
585 }
586
587 frame->pkt_pts = pkt->pts;
588
589 for (i = 0; i < FF_ARRAY_ELEMS(sd); i++) {
590 int size;
591 uint8_t *packet_sd = av_packet_get_side_data(pkt, sd[i].packet, &size);
592 if (packet_sd) {
593 AVFrameSideData *frame_sd = av_frame_new_side_data(frame,
594 sd[i].frame,
595 size);
596 if (!frame_sd)
597 return AVERROR(ENOMEM);
598
599 memcpy(frame_sd->data, packet_sd, size);
600 }
601 }
602
603 return 0;
604 }
605
606 int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
607 {
608 const AVHWAccel *hwaccel = avctx->hwaccel;
609 int override_dimensions = 1;
610 int ret;
611
612 switch (avctx->codec_type) {
613 case AVMEDIA_TYPE_VIDEO:
614 if (frame->width <= 0 || frame->height <= 0) {
615 frame->width = FFMAX(avctx->width, avctx->coded_width);
616 frame->height = FFMAX(avctx->height, avctx->coded_height);
617 override_dimensions = 0;
618 }
619 if (frame->format < 0)
620 frame->format = avctx->pix_fmt;
621 if (!frame->sample_aspect_ratio.num)
622 frame->sample_aspect_ratio = avctx->sample_aspect_ratio;
623
624 if (av_image_check_sar(frame->width, frame->height,
625 frame->sample_aspect_ratio) < 0) {
626 av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
627 frame->sample_aspect_ratio.num,
628 frame->sample_aspect_ratio.den);
629 frame->sample_aspect_ratio = (AVRational){ 0, 1 };
630 }
631
632 if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
633 return ret;
634 break;
635 case AVMEDIA_TYPE_AUDIO:
636 if (!frame->sample_rate)
637 frame->sample_rate = avctx->sample_rate;
638 if (frame->format < 0)
639 frame->format = avctx->sample_fmt;
640 if (!frame->channel_layout) {
641 if (avctx->channel_layout) {
642 if (av_get_channel_layout_nb_channels(avctx->channel_layout) !=
643 avctx->channels) {
644 av_log(avctx, AV_LOG_ERROR, "Inconsistent channel "
645 "configuration.\n");
646 return AVERROR(EINVAL);
647 }
648
649 frame->channel_layout = avctx->channel_layout;
650 } else {
651 if (avctx->channels > FF_SANE_NB_CHANNELS) {
652 av_log(avctx, AV_LOG_ERROR, "Too many channels: %d.\n",
653 avctx->channels);
654 return AVERROR(ENOSYS);
655 }
656
657 frame->channel_layout = av_get_default_channel_layout(avctx->channels);
658 if (!frame->channel_layout)
659 frame->channel_layout = (1ULL << avctx->channels) - 1;
660 }
661 }
662 break;
663 default: return AVERROR(EINVAL);
664 }
665
666 ret = ff_decode_frame_props(avctx, frame);
667 if (ret < 0)
668 return ret;
669
670 if (hwaccel) {
671 if (hwaccel->alloc_frame) {
672 ret = hwaccel->alloc_frame(avctx, frame);
673 goto end;
674 }
675 } else
676 avctx->sw_pix_fmt = avctx->pix_fmt;
677
678 #if FF_API_GET_BUFFER
679 FF_DISABLE_DEPRECATION_WARNINGS
680 /*
681 * Wrap an old get_buffer()-allocated buffer in an bunch of AVBuffers.
682 * We wrap each plane in its own AVBuffer. Each of those has a reference to
683 * a dummy AVBuffer as its private data, unreffing it on free.
684 * When all the planes are freed, the dummy buffer's free callback calls
685 * release_buffer().
686 */
687 if (avctx->get_buffer) {
688 CompatReleaseBufPriv *priv = NULL;
689 AVBufferRef *dummy_buf = NULL;
690 int planes, i, ret;
691
692 if (flags & AV_GET_BUFFER_FLAG_REF)
693 frame->reference = 1;
694
695 ret = avctx->get_buffer(avctx, frame);
696 if (ret < 0)
697 return ret;
698
699 /* return if the buffers are already set up
700 * this would happen e.g. when a custom get_buffer() calls
701 * avcodec_default_get_buffer
702 */
703 if (frame->buf[0])
704 return 0;
705
706 priv = av_mallocz(sizeof(*priv));
707 if (!priv) {
708 ret = AVERROR(ENOMEM);
709 goto fail;
710 }
711 priv->avctx = *avctx;
712 priv->frame = *frame;
713
714 dummy_buf = av_buffer_create(NULL, 0, compat_free_buffer, priv, 0);
715 if (!dummy_buf) {
716 ret = AVERROR(ENOMEM);
717 goto fail;
718 }
719
720 #define WRAP_PLANE(ref_out, data, data_size) \
721 do { \
722 AVBufferRef *dummy_ref = av_buffer_ref(dummy_buf); \
723 if (!dummy_ref) { \
724 ret = AVERROR(ENOMEM); \
725 goto fail; \
726 } \
727 ref_out = av_buffer_create(data, data_size, compat_release_buffer, \
728 dummy_ref, 0); \
729 if (!ref_out) { \
730 av_buffer_unref(&dummy_ref); \
731 av_frame_unref(frame); \
732 ret = AVERROR(ENOMEM); \
733 goto fail; \
734 } \
735 } while (0)
736
737 if (avctx->codec_type == AVMEDIA_TYPE_VIDEO) {
738 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(frame->format);
739
740 planes = av_pix_fmt_count_planes(frame->format);
741 /* workaround for AVHWAccel plane count of 0, buf[0] is used as
742 check for allocated buffers: make libavcodec happy */
743 if (desc && desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
744 planes = 1;
745 if (!desc || planes <= 0) {
746 ret = AVERROR(EINVAL);
747 goto fail;
748 }
749
750 for (i = 0; i < planes; i++) {
751 int v_shift = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
752 int plane_size = (frame->height >> v_shift) * frame->linesize[i];
753
754 WRAP_PLANE(frame->buf[i], frame->data[i], plane_size);
755 }
756 } else {
757 int planar = av_sample_fmt_is_planar(frame->format);
758 planes = planar ? avctx->channels : 1;
759
760 if (planes > FF_ARRAY_ELEMS(frame->buf)) {
761 frame->nb_extended_buf = planes - FF_ARRAY_ELEMS(frame->buf);
762 frame->extended_buf = av_malloc(sizeof(*frame->extended_buf) *
763 frame->nb_extended_buf);
764 if (!frame->extended_buf) {
765 ret = AVERROR(ENOMEM);
766 goto fail;
767 }
768 }
769
770 for (i = 0; i < FFMIN(planes, FF_ARRAY_ELEMS(frame->buf)); i++)
771 WRAP_PLANE(frame->buf[i], frame->extended_data[i], frame->linesize[0]);
772
773 for (i = 0; i < frame->nb_extended_buf; i++)
774 WRAP_PLANE(frame->extended_buf[i],
775 frame->extended_data[i + FF_ARRAY_ELEMS(frame->buf)],
776 frame->linesize[0]);
777 }
778
779 av_buffer_unref(&dummy_buf);
780
781 frame->width = avctx->width;
782 frame->height = avctx->height;
783
784 return 0;
785
786 fail:
787 avctx->release_buffer(avctx, frame);
788 av_freep(&priv);
789 av_buffer_unref(&dummy_buf);
790 return ret;
791 }
792 FF_ENABLE_DEPRECATION_WARNINGS
793 #endif
794
795 ret = avctx->get_buffer2(avctx, frame, flags);
796
797 end:
798 if (avctx->codec_type == AVMEDIA_TYPE_VIDEO && !override_dimensions) {
799 frame->width = avctx->width;
800 frame->height = avctx->height;
801 }
802
803 return ret;
804 }
805
806 int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame)
807 {
808 AVFrame *tmp;
809 int ret;
810
811 av_assert0(avctx->codec_type == AVMEDIA_TYPE_VIDEO);
812
813 if (!frame->data[0])
814 return ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF);
815
816 if (av_frame_is_writable(frame))
817 return ff_decode_frame_props(avctx, frame);
818
819 tmp = av_frame_alloc();
820 if (!tmp)
821 return AVERROR(ENOMEM);
822
823 av_frame_move_ref(tmp, frame);
824
825 ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF);
826 if (ret < 0) {
827 av_frame_free(&tmp);
828 return ret;
829 }
830
831 av_frame_copy(frame, tmp);
832 av_frame_free(&tmp);
833
834 return 0;
835 }
836
837 #if FF_API_GET_BUFFER
838 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic)
839 {
840 av_frame_unref(pic);
841 }
842
843 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic)
844 {
845 av_assert0(0);
846 return AVERROR_BUG;
847 }
848 #endif
849
850 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2), void *arg, int *ret, int count, int size)
851 {
852 int i;
853
854 for (i = 0; i < count; i++) {
855 int r = func(c, (char *)arg + i * size);
856 if (ret)
857 ret[i] = r;
858 }
859 return 0;
860 }
861
862 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int jobnr, int threadnr), void *arg, int *ret, int count)
863 {
864 int i;
865
866 for (i = 0; i < count; i++) {
867 int r = func(c, arg, i, 0);
868 if (ret)
869 ret[i] = r;
870 }
871 return 0;
872 }
873
874 static int is_hwaccel_pix_fmt(enum AVPixelFormat pix_fmt)
875 {
876 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
877 return desc->flags & AV_PIX_FMT_FLAG_HWACCEL;
878 }
879
880 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
881 {
882 while (*fmt != AV_PIX_FMT_NONE && is_hwaccel_pix_fmt(*fmt))
883 ++fmt;
884 return fmt[0];
885 }
886
887 static AVHWAccel *find_hwaccel(enum AVCodecID codec_id,
888 enum AVPixelFormat pix_fmt)
889 {
890 AVHWAccel *hwaccel = NULL;
891
892 while ((hwaccel = av_hwaccel_next(hwaccel)))
893 if (hwaccel->id == codec_id
894 && hwaccel->pix_fmt == pix_fmt)
895 return hwaccel;
896 return NULL;
897 }
898
899 static int setup_hwaccel(AVCodecContext *avctx,
900 const enum AVPixelFormat fmt,
901 const char *name)
902 {
903 AVHWAccel *hwa = find_hwaccel(avctx->codec_id, fmt);
904 int ret = 0;
905
906 if (!hwa) {
907 av_log(avctx, AV_LOG_ERROR,
908 "Could not find an AVHWAccel for the pixel format: %s",
909 name);
910 return AVERROR(ENOENT);
911 }
912
913 if (hwa->priv_data_size) {
914 avctx->internal->hwaccel_priv_data = av_mallocz(hwa->priv_data_size);
915 if (!avctx->internal->hwaccel_priv_data)
916 return AVERROR(ENOMEM);
917 }
918
919 if (hwa->init) {
920 ret = hwa->init(avctx);
921 if (ret < 0) {
922 av_freep(&avctx->internal->hwaccel_priv_data);
923 return ret;
924 }
925 }
926
927 avctx->hwaccel = hwa;
928
929 return 0;
930 }
931
932 int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
933 {
934 const AVPixFmtDescriptor *desc;
935 enum AVPixelFormat *choices;
936 enum AVPixelFormat ret;
937 unsigned n = 0;
938
939 while (fmt[n] != AV_PIX_FMT_NONE)
940 ++n;
941
942 av_assert0(n >= 1);
943 avctx->sw_pix_fmt = fmt[n - 1];
944 av_assert2(!is_hwaccel_pix_fmt(avctx->sw_pix_fmt));
945
946 choices = av_malloc_array(n + 1, sizeof(*choices));
947 if (!choices)
948 return AV_PIX_FMT_NONE;
949
950 memcpy(choices, fmt, (n + 1) * sizeof(*choices));
951
952 for (;;) {
953 if (avctx->hwaccel && avctx->hwaccel->uninit)
954 avctx->hwaccel->uninit(avctx);
955 av_freep(&avctx->internal->hwaccel_priv_data);
956 avctx->hwaccel = NULL;
957
958 ret = avctx->get_format(avctx, choices);
959
960 desc = av_pix_fmt_desc_get(ret);
961 if (!desc) {
962 ret = AV_PIX_FMT_NONE;
963 break;
964 }
965
966 if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
967 break;
968
969 if (!setup_hwaccel(avctx, ret, desc->name))
970 break;
971
972 /* Remove failed hwaccel from choices */
973 for (n = 0; choices[n] != ret; n++)
974 av_assert0(choices[n] != AV_PIX_FMT_NONE);
975
976 do
977 choices[n] = choices[n + 1];
978 while (choices[n++] != AV_PIX_FMT_NONE);
979 }
980
981 av_freep(&choices);
982 return ret;
983 }
984
985 #if FF_API_AVFRAME_LAVC
986 void avcodec_get_frame_defaults(AVFrame *frame)
987 {
988 if (frame->extended_data != frame->data)
989 av_freep(&frame->extended_data);
990
991 memset(frame, 0, sizeof(AVFrame));
992
993 frame->pts = AV_NOPTS_VALUE;
994 frame->key_frame = 1;
995 frame->sample_aspect_ratio = (AVRational) {0, 1 };
996 frame->format = -1; /* unknown */
997 frame->extended_data = frame->data;
998 }
999
1000 AVFrame *avcodec_alloc_frame(void)
1001 {
1002 AVFrame *frame = av_mallocz(sizeof(AVFrame));
1003
1004 if (!frame)
1005 return NULL;
1006
1007 FF_DISABLE_DEPRECATION_WARNINGS
1008 avcodec_get_frame_defaults(frame);
1009 FF_ENABLE_DEPRECATION_WARNINGS
1010
1011 return frame;
1012 }
1013
1014 void avcodec_free_frame(AVFrame **frame)
1015 {
1016 av_frame_free(frame);
1017 }
1018 #endif
1019
1020 int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
1021 {
1022 int ret = 0;
1023 AVDictionary *tmp = NULL;
1024
1025 if (avcodec_is_open(avctx))
1026 return 0;
1027
1028 if ((!codec && !avctx->codec)) {
1029 av_log(avctx, AV_LOG_ERROR, "No codec provided to avcodec_open2().\n");
1030 return AVERROR(EINVAL);
1031 }
1032 if ((codec && avctx->codec && codec != avctx->codec)) {
1033 av_log(avctx, AV_LOG_ERROR, "This AVCodecContext was allocated for %s, "
1034 "but %s passed to avcodec_open2().\n", avctx->codec->name, codec->name);
1035 return AVERROR(EINVAL);
1036 }
1037 if (!codec)
1038 codec = avctx->codec;
1039
1040 if (avctx->extradata_size < 0 || avctx->extradata_size >= FF_MAX_EXTRADATA_SIZE)
1041 return AVERROR(EINVAL);
1042
1043 if (options)
1044 av_dict_copy(&tmp, *options, 0);
1045
1046 /* If there is a user-supplied mutex locking routine, call it. */
1047 if (lockmgr_cb) {
1048 if ((*lockmgr_cb)(&codec_mutex, AV_LOCK_OBTAIN))
1049 return -1;
1050 }
1051
1052 entangled_thread_counter++;
1053 if (entangled_thread_counter != 1 &&
1054 !(codec->caps_internal & FF_CODEC_CAP_INIT_THREADSAFE)) {
1055 av_log(avctx, AV_LOG_ERROR,
1056 "Insufficient thread locking. At least %d threads are "
1057 "calling avcodec_open2() at the same time right now.\n",
1058 entangled_thread_counter);
1059 ret = -1;
1060 goto end;
1061 }
1062
1063 avctx->internal = av_mallocz(sizeof(AVCodecInternal));
1064 if (!avctx->internal) {
1065 ret = AVERROR(ENOMEM);
1066 goto end;
1067 }
1068
1069 avctx->internal->pool = av_mallocz(sizeof(*avctx->internal->pool));
1070 if (!avctx->internal->pool) {
1071 ret = AVERROR(ENOMEM);
1072 goto free_and_end;
1073 }
1074
1075 avctx->internal->to_free = av_frame_alloc();
1076 if (!avctx->internal->to_free) {
1077 ret = AVERROR(ENOMEM);
1078 goto free_and_end;
1079 }
1080
1081 if (codec->priv_data_size > 0) {
1082 if (!avctx->priv_data) {
1083 avctx->priv_data = av_mallocz(codec->priv_data_size);
1084 if (!avctx->priv_data) {
1085 ret = AVERROR(ENOMEM);
1086 goto end;
1087 }
1088 if (codec->priv_class) {
1089 *(const AVClass **)avctx->priv_data = codec->priv_class;
1090 av_opt_set_defaults(avctx->priv_data);
1091 }
1092 }
1093 if (codec->priv_class && (ret = av_opt_set_dict(avctx->priv_data, &tmp)) < 0)
1094 goto free_and_end;
1095 } else {
1096 avctx->priv_data = NULL;
1097 }
1098 if ((ret = av_opt_set_dict(avctx, &tmp)) < 0)
1099 goto free_and_end;
1100
1101 if (avctx->coded_width && avctx->coded_height && !avctx->width && !avctx->height)
1102 ret = ff_set_dimensions(avctx, avctx->coded_width, avctx->coded_height);
1103 else if (avctx->width && avctx->height)
1104 ret = ff_set_dimensions(avctx, avctx->width, avctx->height);
1105 if (ret < 0)
1106 goto free_and_end;
1107
1108 if ((avctx->coded_width || avctx->coded_height || avctx->width || avctx->height)
1109 && ( av_image_check_size(avctx->coded_width, avctx->coded_height, 0, avctx) < 0
1110 || av_image_check_size(avctx->width, avctx->height, 0, avctx) < 0)) {
1111 av_log(avctx, AV_LOG_WARNING, "ignoring invalid width/height values\n");
1112 ff_set_dimensions(avctx, 0, 0);
1113 }
1114
1115 if (avctx->width > 0 && avctx->height > 0) {
1116 if (av_image_check_sar(avctx->width, avctx->height,
1117 avctx->sample_aspect_ratio) < 0) {
1118 av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
1119 avctx->sample_aspect_ratio.num,
1120 avctx->sample_aspect_ratio.den);
1121 avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
1122 }
1123 }
1124
1125 /* if the decoder init function was already called previously,
1126 * free the already allocated subtitle_header before overwriting it */
1127 if (av_codec_is_decoder(codec))
1128 av_freep(&avctx->subtitle_header);
1129
1130 if (avctx->channels > FF_SANE_NB_CHANNELS) {
1131 ret = AVERROR(EINVAL);
1132 goto free_and_end;
1133 }
1134
1135 avctx->codec = codec;
1136 if ((avctx->codec_type == AVMEDIA_TYPE_UNKNOWN || avctx->codec_type == codec->type) &&
1137 avctx->codec_id == AV_CODEC_ID_NONE) {
1138 avctx->codec_type = codec->type;
1139 avctx->codec_id = codec->id;
1140 }
1141 if (avctx->codec_id != codec->id || (avctx->codec_type != codec->type
1142 && avctx->codec_type != AVMEDIA_TYPE_ATTACHMENT)) {
1143 av_log(avctx, AV_LOG_ERROR, "codec type or id mismatches\n");
1144 ret = AVERROR(EINVAL);
1145 goto free_and_end;
1146 }
1147 avctx->frame_number = 0;
1148
1149 if ((avctx->codec->capabilities & AV_CODEC_CAP_EXPERIMENTAL) &&
1150 avctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
1151 ret = AVERROR_EXPERIMENTAL;
1152 goto free_and_end;
1153 }
1154
1155 if (avctx->codec_type == AVMEDIA_TYPE_AUDIO &&
1156 (!avctx->time_base.num || !avctx->time_base.den)) {
1157 avctx->time_base.num = 1;
1158 avctx->time_base.den = avctx->sample_rate;
1159 }
1160
1161 if (HAVE_THREADS) {
1162 ret = ff_thread_init(avctx);
1163 if (ret < 0) {
1164 goto free_and_end;
1165 }
1166 }
1167 if (!HAVE_THREADS && !(codec->capabilities & AV_CODEC_CAP_AUTO_THREADS))
1168 avctx->thread_count = 1;
1169
1170 if (av_codec_is_encoder(avctx->codec)) {
1171 int i;
1172 #if FF_API_CODED_FRAME
1173 FF_DISABLE_DEPRECATION_WARNINGS
1174 avctx->coded_frame = av_frame_alloc();
1175 if (!avctx->coded_frame) {
1176 ret = AVERROR(ENOMEM);
1177 goto free_and_end;
1178 }
1179 FF_ENABLE_DEPRECATION_WARNINGS
1180 #endif
1181 if (avctx->codec->sample_fmts) {
1182 for (i = 0; avctx->codec->sample_fmts[i] != AV_SAMPLE_FMT_NONE; i++) {
1183 if (avctx->sample_fmt == avctx->codec->sample_fmts[i])
1184 break;
1185 if (avctx->channels == 1 &&
1186 av_get_planar_sample_fmt(avctx->sample_fmt) ==
1187 av_get_planar_sample_fmt(avctx->codec->sample_fmts[i])) {
1188 avctx->sample_fmt = avctx->codec->sample_fmts[i];
1189 break;
1190 }
1191 }
1192 if (avctx->codec->sample_fmts[i] == AV_SAMPLE_FMT_NONE) {
1193 av_log(avctx, AV_LOG_ERROR, "Specified sample_fmt is not supported.\n");
1194 ret = AVERROR(EINVAL);
1195 goto free_and_end;
1196 }
1197 }
1198 if (avctx->codec->pix_fmts) {
1199 for (i = 0; avctx->codec->pix_fmts[i] != AV_PIX_FMT_NONE; i++)
1200 if (avctx->pix_fmt == avctx->codec->pix_fmts[i])
1201 break;
1202 if (avctx->codec->pix_fmts[i] == AV_PIX_FMT_NONE) {
1203 av_log(avctx, AV_LOG_ERROR, "Specified pix_fmt is not supported\n");
1204 ret = AVERROR(EINVAL);
1205 goto free_and_end;
1206 }
1207 if (avctx->codec->pix_fmts[i] == AV_PIX_FMT_YUVJ420P ||
1208 avctx->codec->pix_fmts[i] == AV_PIX_FMT_YUVJ422P ||
1209 avctx->codec->pix_fmts[i] == AV_PIX_FMT_YUVJ440P ||
1210 avctx->codec->pix_fmts[i] == AV_PIX_FMT_YUVJ444P)
1211 avctx->color_range = AVCOL_RANGE_JPEG;
1212 }
1213 if (avctx->codec->supported_samplerates) {
1214 for (i = 0; avctx->codec->supported_samplerates[i] != 0; i++)
1215 if (avctx->sample_rate == avctx->codec->supported_samplerates[i])
1216 break;
1217 if (avctx->codec->supported_samplerates[i] == 0) {
1218 av_log(avctx, AV_LOG_ERROR, "Specified sample_rate is not supported\n");
1219 ret = AVERROR(EINVAL);
1220 goto free_and_end;
1221 }
1222 }
1223 if (avctx->codec->channel_layouts) {
1224 if (!avctx->channel_layout) {
1225 av_log(avctx, AV_LOG_WARNING, "channel_layout not specified\n");
1226 } else {
1227 for (i = 0; avctx->codec->channel_layouts[i] != 0; i++)
1228 if (avctx->channel_layout == avctx->codec->channel_layouts[i])
1229 break;
1230 if (avctx->codec->channel_layouts[i] == 0) {
1231 av_log(avctx, AV_LOG_ERROR, "Specified channel_layout is not supported\n");
1232 ret = AVERROR(EINVAL);
1233 goto free_and_end;
1234 }
1235 }
1236 }
1237 if (avctx->channel_layout && avctx->channels) {
1238 if (av_get_channel_layout_nb_channels(avctx->channel_layout) != avctx->channels) {
1239 av_log(avctx, AV_LOG_ERROR, "channel layout does not match number of channels\n");
1240 ret = AVERROR(EINVAL);
1241 goto free_and_end;
1242 }
1243 } else if (avctx->channel_layout) {
1244 avctx->channels = av_get_channel_layout_nb_channels(avctx->channel_layout);
1245 }
1246
1247 if (!avctx->rc_initial_buffer_occupancy)
1248 avctx->rc_initial_buffer_occupancy = avctx->rc_buffer_size * 3 / 4;
1249 }
1250
1251 if (avctx->codec->init && !(avctx->active_thread_type & FF_THREAD_FRAME)) {
1252 ret = avctx->codec->init(avctx);
1253 if (ret < 0) {
1254 goto free_and_end;
1255 }
1256 }
1257
1258 #if FF_API_AUDIOENC_DELAY
1259 if (av_codec_is_encoder(avctx->codec))
1260 avctx->delay = avctx->initial_padding;
1261 #endif
1262
1263 if (av_codec_is_decoder(avctx->codec)) {
1264 /* validate channel layout from the decoder */
1265 if (avctx->channel_layout) {
1266 int channels = av_get_channel_layout_nb_channels(avctx->channel_layout);
1267 if (!avctx->channels)
1268 avctx->channels = channels;
1269 else if (channels != avctx->channels) {
1270 av_log(avctx, AV_LOG_WARNING,
1271 "channel layout does not match number of channels\n");
1272 avctx->channel_layout = 0;
1273 }
1274 }
1275 if (avctx->channels && avctx->channels < 0 ||
1276 avctx->channels > FF_SANE_NB_CHANNELS) {
1277 ret = AVERROR(EINVAL);
1278 goto free_and_end;
1279 }
1280
1281 #if FF_API_AVCTX_TIMEBASE
1282 if (avctx->framerate.num > 0 && avctx->framerate.den > 0)
1283 avctx->time_base = av_inv_q(avctx->framerate);
1284 #endif
1285 }
1286 end:
1287 entangled_thread_counter--;
1288
1289 /* Release any user-supplied mutex. */
1290 if (lockmgr_cb) {
1291 (*lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE);
1292 }
1293 if (options) {
1294 av_dict_free(options);
1295 *options = tmp;
1296 }
1297
1298 return ret;
1299 free_and_end:
1300 if (avctx->codec &&
1301 (avctx->codec->caps_internal & FF_CODEC_CAP_INIT_CLEANUP))
1302 avctx->codec->close(avctx);
1303
1304 if (avctx->priv_data && avctx->codec && avctx->codec->priv_class)
1305 av_opt_free(avctx->priv_data);
1306 av_opt_free(avctx);
1307
1308 #if FF_API_CODED_FRAME
1309 FF_DISABLE_DEPRECATION_WARNINGS
1310 av_frame_free(&avctx->coded_frame);
1311 FF_ENABLE_DEPRECATION_WARNINGS
1312 #endif
1313
1314 av_dict_free(&tmp);
1315 av_freep(&avctx->priv_data);
1316 if (avctx->internal) {
1317 av_frame_free(&avctx->internal->to_free);
1318 av_freep(&avctx->internal->pool);
1319 }
1320 av_freep(&avctx->internal);
1321 avctx->codec = NULL;
1322 goto end;
1323 }
1324
1325 int ff_alloc_packet(AVPacket *avpkt, int size)
1326 {
1327 if (size > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE)
1328 return AVERROR(EINVAL);
1329
1330 if (avpkt->data) {
1331 AVBufferRef *buf = avpkt->buf;
1332
1333 if (avpkt->size < size)
1334 return AVERROR(EINVAL);
1335
1336 av_init_packet(avpkt);
1337 avpkt->buf = buf;
1338 avpkt->size = size;
1339 return 0;
1340 } else {
1341 return av_new_packet(avpkt, size);
1342 }
1343 }
1344
1345 /**
1346 * Pad last frame with silence.
1347 */
1348 static int pad_last_frame(AVCodecContext *s, AVFrame **dst, const AVFrame *src)
1349 {
1350 AVFrame *frame = NULL;
1351 int ret;
1352
1353 if (!(frame = av_frame_alloc()))
1354 return AVERROR(ENOMEM);
1355
1356 frame->format = src->format;
1357 frame->channel_layout = src->channel_layout;
1358 frame->nb_samples = s->frame_size;
1359 ret = av_frame_get_buffer(frame, 32);
1360 if (ret < 0)
1361 goto fail;
1362
1363 ret = av_frame_copy_props(frame, src);
1364 if (ret < 0)
1365 goto fail;
1366
1367 if ((ret = av_samples_copy(frame->extended_data, src->extended_data, 0, 0,
1368 src->nb_samples, s->channels, s->sample_fmt)) < 0)
1369 goto fail;
1370 if ((ret = av_samples_set_silence(frame->extended_data, src->nb_samples,
1371 frame->nb_samples - src->nb_samples,
1372 s->channels, s->sample_fmt)) < 0)
1373 goto fail;
1374
1375 *dst = frame;
1376
1377 return 0;
1378
1379 fail:
1380 av_frame_free(&frame);
1381 return ret;
1382 }
1383
1384 int attribute_align_arg avcodec_encode_audio2(AVCodecContext *avctx,
1385 AVPacket *avpkt,
1386 const AVFrame *frame,
1387 int *got_packet_ptr)
1388 {
1389 AVFrame tmp;
1390 AVFrame *padded_frame = NULL;
1391 int ret;
1392 int user_packet = !!avpkt->data;
1393
1394 *got_packet_ptr = 0;
1395
1396 if (!(avctx->codec->capabilities & AV_CODEC_CAP_DELAY) && !frame) {
1397 av_free_packet(avpkt);
1398 av_init_packet(avpkt);
1399 return 0;
1400 }
1401
1402 /* ensure that extended_data is properly set */
1403 if (frame && !frame->extended_data) {
1404 if (av_sample_fmt_is_planar(avctx->sample_fmt) &&
1405 avctx->channels > AV_NUM_DATA_POINTERS) {
1406 av_log(avctx, AV_LOG_ERROR, "Encoding to a planar sample format, "
1407 "with more than %d channels, but extended_data is not set.\n",
1408 AV_NUM_DATA_POINTERS);
1409 return AVERROR(EINVAL);
1410 }
1411 av_log(avctx, AV_LOG_WARNING, "extended_data is not set.\n");
1412
1413 tmp = *frame;
1414 tmp.extended_data = tmp.data;
1415 frame = &tmp;
1416 }
1417
1418 /* extract audio service type metadata */
1419 if (frame) {
1420 AVFrameSideData *sd = av_frame_get_side_data(frame, AV_FRAME_DATA_AUDIO_SERVICE_TYPE);
1421 if (sd && sd->size >= sizeof(enum AVAudioServiceType))
1422 avctx->audio_service_type = *(enum AVAudioServiceType*)sd->data;
1423 }
1424
1425 /* check for valid frame size */
1426 if (frame) {
1427 if (avctx->codec->capabilities & AV_CODEC_CAP_SMALL_LAST_FRAME) {
1428 if (frame->nb_samples > avctx->frame_size)
1429 return AVERROR(EINVAL);
1430 } else if (!(avctx->codec->capabilities & AV_CODEC_CAP_VARIABLE_FRAME_SIZE)) {
1431 if (frame->nb_samples < avctx->frame_size &&
1432 !avctx->internal->last_audio_frame) {
1433 ret = pad_last_frame(avctx, &padded_frame, frame);
1434 if (ret < 0)
1435 return ret;
1436
1437 frame = padded_frame;
1438 avctx->internal->last_audio_frame = 1;
1439 }
1440
1441 if (frame->nb_samples != avctx->frame_size) {
1442 ret = AVERROR(EINVAL);
1443 goto end;
1444 }
1445 }
1446 }
1447
1448 ret = avctx->codec->encode2(avctx, avpkt, frame, got_packet_ptr);
1449 if (!ret) {
1450 if (*got_packet_ptr) {
1451 if (!(avctx->codec->capabilities & AV_CODEC_CAP_DELAY)) {
1452 if (avpkt->pts == AV_NOPTS_VALUE)
1453 avpkt->pts = frame->pts;
1454 if (!avpkt->duration)
1455 avpkt->duration = ff_samples_to_time_base(avctx,
1456 frame->nb_samples);
1457 }
1458 avpkt->dts = avpkt->pts;
1459 } else {
1460 avpkt->size = 0;
1461 }
1462
1463 if (!user_packet && avpkt->size) {
1464 ret = av_buffer_realloc(&avpkt->buf, avpkt->size);
1465 if (ret >= 0)
1466 avpkt->data = avpkt->buf->data;
1467 }
1468
1469 avctx->frame_number++;
1470 }
1471
1472 if (ret < 0 || !*got_packet_ptr) {
1473 av_free_packet(avpkt);
1474 av_init_packet(avpkt);
1475 goto end;
1476 }
1477
1478 /* NOTE: if we add any audio encoders which output non-keyframe packets,
1479 * this needs to be moved to the encoders, but for now we can do it
1480 * here to simplify things */
1481 avpkt->flags |= AV_PKT_FLAG_KEY;
1482
1483 end:
1484 av_frame_free(&padded_frame);
1485
1486 #if FF_API_AUDIOENC_DELAY
1487 avctx->delay = avctx->initial_padding;
1488 #endif
1489
1490 return ret;
1491 }
1492
1493 int attribute_align_arg avcodec_encode_video2(AVCodecContext *avctx,
1494 AVPacket *avpkt,
1495 const AVFrame *frame,
1496 int *got_packet_ptr)
1497 {
1498 int ret;
1499 int user_packet = !!avpkt->data;
1500
1501 *got_packet_ptr = 0;
1502
1503 if (!(avctx->codec->capabilities & AV_CODEC_CAP_DELAY) && !frame) {
1504 av_free_packet(avpkt);
1505 av_init_packet(avpkt);
1506 avpkt->size = 0;
1507 return 0;
1508 }
1509
1510 if (av_image_check_size(avctx->width, avctx->height, 0, avctx))
1511 return AVERROR(EINVAL);
1512
1513 av_assert0(avctx->codec->encode2);
1514
1515 ret = avctx->codec->encode2(avctx, avpkt, frame, got_packet_ptr);
1516 if (!ret) {
1517 if (!*got_packet_ptr)
1518 avpkt->size = 0;
1519 else if (!(avctx->codec->capabilities & AV_CODEC_CAP_DELAY))
1520 avpkt->pts = avpkt->dts = frame->pts;
1521
1522 if (!user_packet && avpkt->size) {
1523 ret = av_buffer_realloc(&avpkt->buf, avpkt->size);
1524 if (ret >= 0)
1525 avpkt->data = avpkt->buf->data;
1526 }
1527
1528 avctx->frame_number++;
1529 }
1530
1531 if (ret < 0 || !*got_packet_ptr)
1532 av_free_packet(avpkt);
1533
1534 emms_c();
1535 return ret;
1536 }
1537
1538 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
1539 const AVSubtitle *sub)
1540 {
1541 int ret;
1542 if (sub->start_display_time) {
1543 av_log(avctx, AV_LOG_ERROR, "start_display_time must be 0.\n");
1544 return -1;
1545 }
1546 if (sub->num_rects == 0 || !sub->rects)
1547 return -1;
1548 ret = avctx->codec->encode_sub(avctx, buf, buf_size, sub);
1549 avctx->frame_number++;
1550 return ret;
1551 }
1552
1553 static int apply_param_change(AVCodecContext *avctx, AVPacket *avpkt)
1554 {
1555 int size = 0, ret;
1556 const uint8_t *data;
1557 uint32_t flags;
1558
1559 data = av_packet_get_side_data(avpkt, AV_PKT_DATA_PARAM_CHANGE, &size);
1560 if (!data)
1561 return 0;
1562
1563 if (!(avctx->codec->capabilities & AV_CODEC_CAP_PARAM_CHANGE)) {
1564 av_log(avctx, AV_LOG_ERROR, "This decoder does not support parameter "
1565 "changes, but PARAM_CHANGE side data was sent to it.\n");
1566 return AVERROR(EINVAL);
1567 }
1568
1569 if (size < 4)
1570 goto fail;
1571
1572 flags = bytestream_get_le32(&data);
1573 size -= 4;
1574
1575 if (flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT) {
1576 if (size < 4)
1577 goto fail;
1578 avctx->channels = bytestream_get_le32(&data);
1579 size -= 4;
1580 }
1581 if (flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT) {
1582 if (size < 8)
1583 goto fail;
1584 avctx->channel_layout = bytestream_get_le64(&data);
1585 size -= 8;
1586 }
1587 if (flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE) {
1588 if (size < 4)
1589 goto fail;
1590 avctx->sample_rate = bytestream_get_le32(&data);
1591 size -= 4;
1592 }
1593 if (flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS) {
1594 if (size < 8)
1595 goto fail;
1596 avctx->width = bytestream_get_le32(&data);
1597 avctx->height = bytestream_get_le32(&data);
1598 size -= 8;
1599 ret = ff_set_dimensions(avctx, avctx->width, avctx->height);
1600 if (ret < 0)
1601 return ret;
1602 }
1603
1604 return 0;
1605 fail:
1606 av_log(avctx, AV_LOG_ERROR, "PARAM_CHANGE side data too small.\n");
1607 return AVERROR_INVALIDDATA;
1608 }
1609
1610 static int unrefcount_frame(AVCodecInternal *avci, AVFrame *frame)
1611 {
1612 int ret;
1613
1614 /* move the original frame to our backup */
1615 av_frame_unref(avci->to_free);
1616 av_frame_move_ref(avci->to_free, frame);
1617
1618 /* now copy everything except the AVBufferRefs back
1619 * note that we make a COPY of the side data, so calling av_frame_free() on
1620 * the caller's frame will work properly */
1621 ret = av_frame_copy_props(frame, avci->to_free);
1622 if (ret < 0)
1623 return ret;
1624
1625 memcpy(frame->data, avci->to_free->data, sizeof(frame->data));
1626 memcpy(frame->linesize, avci->to_free->linesize, sizeof(frame->linesize));
1627 if (avci->to_free->extended_data != avci->to_free->data) {
1628 int planes = av_get_channel_layout_nb_channels(avci->to_free->channel_layout);
1629 int size = planes * sizeof(*frame->extended_data);
1630
1631 if (!size) {
1632 av_frame_unref(frame);
1633 return AVERROR_BUG;
1634 }
1635
1636 frame->extended_data = av_malloc(size);
1637 if (!frame->extended_data) {
1638 av_frame_unref(frame);
1639 return AVERROR(ENOMEM);
1640 }
1641 memcpy(frame->extended_data, avci->to_free->extended_data,
1642 size);
1643 } else
1644 frame->extended_data = frame->data;
1645
1646 frame->format = avci->to_free->format;
1647 frame->width = avci->to_free->width;
1648 frame->height = avci->to_free->height;
1649 frame->channel_layout = avci->to_free->channel_layout;
1650 frame->nb_samples = avci->to_free->nb_samples;
1651
1652 return 0;
1653 }
1654
1655 int attribute_align_arg avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
1656 int *got_picture_ptr,
1657 AVPacket *avpkt)
1658 {
1659 AVCodecInternal *avci = avctx->internal;
1660 int ret;
1661
1662 *got_picture_ptr = 0;
1663 if ((avctx->coded_width || avctx->coded_height) && av_image_check_size(avctx->coded_width, avctx->coded_height, 0, avctx))
1664 return -1;
1665
1666 avctx->internal->pkt = avpkt;
1667 ret = apply_param_change(avctx, avpkt);
1668 if (ret < 0) {
1669 av_log(avctx, AV_LOG_ERROR, "Error applying parameter changes.\n");
1670 if (avctx->err_recognition & AV_EF_EXPLODE)
1671 return ret;
1672 }
1673
1674 av_frame_unref(picture);
1675
1676 if ((avctx->codec->capabilities & AV_CODEC_CAP_DELAY) || avpkt->size ||
1677 (avctx->active_thread_type & FF_THREAD_FRAME)) {
1678 if (HAVE_THREADS && avctx->active_thread_type & FF_THREAD_FRAME)
1679 ret = ff_thread_decode_frame(avctx, picture, got_picture_ptr,
1680 avpkt);
1681 else {
1682 ret = avctx->codec->decode(avctx, picture, got_picture_ptr,
1683 avpkt);
1684 picture->pkt_dts = avpkt->dts;
1685 /* get_buffer is supposed to set frame parameters */
1686 if (!(avctx->codec->capabilities & AV_CODEC_CAP_DR1)) {
1687 picture->sample_aspect_ratio = avctx->sample_aspect_ratio;
1688 picture->width = avctx->width;
1689 picture->height = avctx->height;
1690 picture->format = avctx->pix_fmt;
1691 }
1692 }
1693
1694 emms_c(); //needed to avoid an emms_c() call before every return;
1695
1696 if (*got_picture_ptr) {
1697 if (!avctx->refcounted_frames) {
1698 int err = unrefcount_frame(avci, picture);
1699 if (err < 0)
1700 return err;
1701 }
1702
1703 avctx->frame_number++;
1704 } else
1705 av_frame_unref(picture);
1706 } else
1707 ret = 0;
1708
1709 #if FF_API_AVCTX_TIMEBASE
1710 if (avctx->framerate.num > 0 && avctx->framerate.den > 0)
1711 avctx->time_base = av_inv_q(avctx->framerate);
1712 #endif
1713
1714 return ret;
1715 }
1716
1717 int attribute_align_arg avcodec_decode_audio4(AVCodecContext *avctx,
1718 AVFrame *frame,
1719 int *got_frame_ptr,
1720 AVPacket *avpkt)
1721 {
1722 AVCodecInternal *avci = avctx->internal;
1723 int ret = 0;
1724
1725 *got_frame_ptr = 0;
1726
1727 avctx->internal->pkt = avpkt;
1728
1729 if (!avpkt->data && avpkt->size) {
1730 av_log(avctx, AV_LOG_ERROR, "invalid packet: NULL data, size != 0\n");
1731 return AVERROR(EINVAL);
1732 }
1733
1734 ret = apply_param_change(avctx, avpkt);
1735 if (ret < 0) {
1736 av_log(avctx, AV_LOG_ERROR, "Error applying parameter changes.\n");
1737 if (avctx->err_recognition & AV_EF_EXPLODE)
1738 return ret;
1739 }
1740
1741 av_frame_unref(frame);
1742
1743 if ((avctx->codec->capabilities & AV_CODEC_CAP_DELAY) || avpkt->size) {
1744 ret = avctx->codec->decode(avctx, frame, got_frame_ptr, avpkt);
1745 if (ret >= 0 && *got_frame_ptr) {
1746 avctx->frame_number++;
1747 frame->pkt_dts = avpkt->dts;
1748 if (frame->format == AV_SAMPLE_FMT_NONE)
1749 frame->format = avctx->sample_fmt;
1750
1751 if (!avctx->refcounted_frames) {
1752 int err = unrefcount_frame(avci, frame);
1753 if (err < 0)
1754 return err;
1755 }
1756 } else
1757 av_frame_unref(frame);
1758 }
1759
1760
1761 return ret;
1762 }
1763
1764 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
1765 int *got_sub_ptr,
1766 AVPacket *avpkt)
1767 {
1768 int ret;
1769
1770 avctx->internal->pkt = avpkt;
1771 *got_sub_ptr = 0;
1772 ret = avctx->codec->decode(avctx, sub, got_sub_ptr, avpkt);
1773 if (*got_sub_ptr)
1774 avctx->frame_number++;
1775 return ret;
1776 }
1777
1778 void avsubtitle_free(AVSubtitle *sub)
1779 {
1780 int i;
1781
1782 for (i = 0; i < sub->num_rects; i++) {
1783 av_freep(&sub->rects[i]->pict.data[0]);
1784 av_freep(&sub->rects[i]->pict.data[1]);
1785 av_freep(&sub->rects[i]->pict.data[2]);
1786 av_freep(&sub->rects[i]->pict.data[3]);
1787 av_freep(&sub->rects[i]->text);
1788 av_freep(&sub->rects[i]->ass);
1789 av_freep(&sub->rects[i]);
1790 }
1791
1792 av_freep(&sub->rects);
1793
1794 memset(sub, 0, sizeof(AVSubtitle));
1795 }
1796
1797 av_cold int avcodec_close(AVCodecContext *avctx)
1798 {
1799 if (avcodec_is_open(avctx)) {
1800 FramePool *pool = avctx->internal->pool;
1801 int i;
1802 if (HAVE_THREADS && avctx->internal->thread_ctx)
1803 ff_thread_free(avctx);
1804 if (avctx->codec && avctx->codec->close)
1805 avctx->codec->close(avctx);
1806 av_frame_free(&avctx->internal->to_free);
1807 for (i = 0; i < FF_ARRAY_ELEMS(pool->pools); i++)
1808 av_buffer_pool_uninit(&pool->pools[i]);
1809 av_freep(&avctx->internal->pool);
1810
1811 if (avctx->hwaccel && avctx->hwaccel->uninit)
1812 avctx->hwaccel->uninit(avctx);
1813 av_freep(&avctx->internal->hwaccel_priv_data);
1814
1815 av_freep(&avctx->internal);
1816 }
1817
1818 if (avctx->priv_data && avctx->codec && avctx->codec->priv_class)
1819 av_opt_free(avctx->priv_data);
1820 av_opt_free(avctx);
1821 av_freep(&avctx->priv_data);
1822 if (av_codec_is_encoder(avctx->codec)) {
1823 av_freep(&avctx->extradata);
1824 #if FF_API_CODED_FRAME
1825 FF_DISABLE_DEPRECATION_WARNINGS
1826 av_frame_free(&avctx->coded_frame);
1827 FF_ENABLE_DEPRECATION_WARNINGS
1828 #endif
1829 }
1830 avctx->codec = NULL;
1831 avctx->active_thread_type = 0;
1832
1833 return 0;
1834 }
1835
1836 static AVCodec *find_encdec(enum AVCodecID id, int encoder)
1837 {
1838 AVCodec *p, *experimental = NULL;
1839 p = first_avcodec;
1840 while (p) {
1841 if ((encoder ? av_codec_is_encoder(p) : av_codec_is_decoder(p)) &&
1842 p->id == id) {
1843 if (p->capabilities & AV_CODEC_CAP_EXPERIMENTAL && !experimental) {
1844 experimental = p;
1845 } else
1846 return p;
1847 }
1848 p = p->next;
1849 }
1850 return experimental;
1851 }
1852
1853 AVCodec *avcodec_find_encoder(enum AVCodecID id)
1854 {
1855 return find_encdec(id, 1);
1856 }
1857
1858 AVCodec *avcodec_find_encoder_by_name(const char *name)
1859 {
1860 AVCodec *p;
1861 if (!name)
1862 return NULL;
1863 p = first_avcodec;
1864 while (p) {
1865 if (av_codec_is_encoder(p) && strcmp(name, p->name) == 0)
1866 return p;
1867 p = p->next;
1868 }
1869 return NULL;
1870 }
1871
1872 AVCodec *avcodec_find_decoder(enum AVCodecID id)
1873 {
1874 return find_encdec(id, 0);
1875 }
1876
1877 AVCodec *avcodec_find_decoder_by_name(const char *name)
1878 {
1879 AVCodec *p;
1880 if (!name)
1881 return NULL;
1882 p = first_avcodec;
1883 while (p) {
1884 if (av_codec_is_decoder(p) && strcmp(name, p->name) == 0)
1885 return p;
1886 p = p->next;
1887 }
1888 return NULL;
1889 }
1890
1891 static int get_bit_rate(AVCodecContext *ctx)
1892 {
1893 int bit_rate;
1894 int bits_per_sample;
1895
1896 switch (ctx->codec_type) {
1897 case AVMEDIA_TYPE_VIDEO:
1898 case AVMEDIA_TYPE_DATA:
1899 case AVMEDIA_TYPE_SUBTITLE:
1900 case AVMEDIA_TYPE_ATTACHMENT:
1901 bit_rate = ctx->bit_rate;
1902 break;
1903 case AVMEDIA_TYPE_AUDIO:
1904 bits_per_sample = av_get_bits_per_sample(ctx->codec_id);
1905 bit_rate = bits_per_sample ? ctx->sample_rate * ctx->channels * bits_per_sample : ctx->bit_rate;
1906 break;
1907 default:
1908 bit_rate = 0;
1909 break;
1910 }
1911 return bit_rate;
1912 }
1913
1914 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag)
1915 {
1916 int i, len, ret = 0;
1917
1918 #define TAG_PRINT(x) \
1919 (((x) >= '0' && (x) <= '9') || \
1920 ((x) >= 'a' && (x) <= 'z') || ((x) >= 'A' && (x) <= 'Z') || \
1921 ((x) == '.' || (x) == ' '))
1922
1923 for (i = 0; i < 4; i++) {
1924 len = snprintf(buf, buf_size,
1925 TAG_PRINT(codec_tag & 0xFF) ? "%c" : "[%d]", codec_tag & 0xFF);
1926 buf += len;
1927 buf_size = buf_size > len ? buf_size - len : 0;
1928 ret += len;
1929 codec_tag >>= 8;
1930 }
1931 return ret;
1932 }
1933
1934 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
1935 {
1936 const char *codec_name;
1937 const char *profile = NULL;
1938 const AVCodec *p;
1939 char buf1[32];
1940 int bitrate;
1941 int new_line = 0;
1942 AVRational display_aspect_ratio;
1943
1944 if (enc->codec)
1945 p = enc->codec;
1946 else if (encode)
1947 p = avcodec_find_encoder(enc->codec_id);
1948 else
1949 p = avcodec_find_decoder(enc->codec_id);
1950
1951 if (p) {
1952 codec_name = p->name;
1953 profile = av_get_profile_name(p, enc->profile);
1954 } else if (enc->codec_id == AV_CODEC_ID_MPEG2TS) {
1955 /* fake mpeg2 transport stream codec (currently not
1956 * registered) */
1957 codec_name = "mpeg2ts";
1958 } else {
1959 /* output avi tags */
1960 char tag_buf[32];
1961 av_get_codec_tag_string(tag_buf, sizeof(tag_buf), enc->codec_tag);
1962 snprintf(buf1, sizeof(buf1), "%s / 0x%04X", tag_buf, enc->codec_tag);
1963 codec_name = buf1;
1964 }
1965
1966 switch (enc->codec_type) {
1967 case AVMEDIA_TYPE_VIDEO:
1968 snprintf(buf, buf_size,
1969 "Video: %s%s",
1970 codec_name, enc->mb_decision ? " (hq)" : "");
1971 if (profile)
1972 snprintf(buf + strlen(buf), buf_size - strlen(buf),
1973 " (%s)", profile);
1974 if (enc->codec_tag) {
1975 char tag_buf[32];
1976 av_get_codec_tag_string(tag_buf, sizeof(tag_buf), enc->codec_tag);
1977 snprintf(buf + strlen(buf), buf_size - strlen(buf),
1978 " [%s / 0x%04X]", tag_buf, enc->codec_tag);
1979 }
1980
1981 av_strlcat(buf, "\n ", buf_size);
1982 snprintf(buf + strlen(buf), buf_size - strlen(buf),
1983 "%s", enc->pix_fmt == AV_PIX_FMT_NONE ? "none" :
1984 av_get_pix_fmt_name(enc->pix_fmt));
1985
1986 if (enc->color_range != AVCOL_RANGE_UNSPECIFIED)
1987 snprintf(buf + strlen(buf), buf_size - strlen(buf), ", %s",
1988 av_color_range_name(enc->color_range));
1989 if (enc->colorspace != AVCOL_SPC_UNSPECIFIED ||
1990 enc->color_primaries != AVCOL_PRI_UNSPECIFIED ||
1991 enc->color_trc != AVCOL_TRC_UNSPECIFIED) {
1992 new_line = 1;
1993 snprintf(buf + strlen(buf), buf_size - strlen(buf), ", %s/%s/%s",
1994 av_color_space_name(enc->colorspace),
1995 av_color_primaries_name(enc->color_primaries),
1996 av_color_transfer_name(enc->color_trc));
1997 }
1998 if (av_log_get_level() >= AV_LOG_DEBUG &&
1999 enc->chroma_sample_location != AVCHROMA_LOC_UNSPECIFIED)
2000 snprintf(buf + strlen(buf), buf_size - strlen(buf), ", %s",
2001 av_chroma_location_name(enc->chroma_sample_location));
2002
2003 if (enc->width) {
2004 av_strlcat(buf, new_line ? "\n " : ", ", buf_size);
2005
2006 snprintf(buf + strlen(buf), buf_size - strlen(buf),
2007 "%dx%d",
2008 enc->width, enc->height);
2009
2010 if (av_log_get_level() >= AV_LOG_VERBOSE &&
2011 (enc->width != enc->coded_width ||
2012 enc->height != enc->coded_height))
2013 snprintf(buf + strlen(buf), buf_size - strlen(buf),
2014 " (%dx%d)", enc->coded_width, enc->coded_height);
2015
2016 if (enc->sample_aspect_ratio.num) {
2017 av_reduce(&display_aspect_ratio.num, &display_aspect_ratio.den,
2018 enc->width * enc->sample_aspect_ratio.num,
2019 enc->height * enc->sample_aspect_ratio.den,
2020 1024 * 1024);
2021 snprintf(buf + strlen(buf), buf_size - strlen(buf),
2022 " [PAR %d:%d DAR %d:%d]",
2023 enc->sample_aspect_ratio.num, enc->sample_aspect_ratio.den,
2024 display_aspect_ratio.num, display_aspect_ratio.den);
2025 }
2026 if (av_log_get_level() >= AV_LOG_DEBUG) {
2027 int g = av_gcd(enc->time_base.num, enc->time_base.den);
2028 snprintf(buf + strlen(buf), buf_size - strlen(buf),
2029 ", %d/%d",
2030 enc->time_base.num / g, enc->time_base.den / g);
2031 }
2032 }
2033 if (encode) {
2034 snprintf(buf + strlen(buf), buf_size - strlen(buf),
2035 ", q=%d-%d", enc->qmin, enc->qmax);
2036 }
2037 break;
2038 case AVMEDIA_TYPE_AUDIO:
2039 snprintf(buf, buf_size,
2040 "Audio: %s",
2041 codec_name);
2042 if (profile)
2043 snprintf(buf + strlen(buf), buf_size - strlen(buf),
2044 " (%s)", profile);
2045 if (enc->codec_tag) {
2046 char tag_buf[32];
2047 av_get_codec_tag_string(tag_buf, sizeof(tag_buf), enc->codec_tag);
2048 snprintf(buf + strlen(buf), buf_size - strlen(buf),
2049 " [%s / 0x%04X]", tag_buf, enc->codec_tag);
2050 }
2051
2052 av_strlcat(buf, "\n ", buf_size);
2053 if (enc->sample_rate) {
2054 snprintf(buf + strlen(buf), buf_size - strlen(buf),
2055 "%d Hz, ", enc->sample_rate);
2056 }
2057 av_get_channel_layout_string(buf + strlen(buf), buf_size - strlen(buf), enc->channels, enc->channel_layout);
2058 if (enc->sample_fmt != AV_SAMPLE_FMT_NONE) {
2059 snprintf(buf + strlen(buf), buf_size - strlen(buf),
2060 ", %s", av_get_sample_fmt_name(enc->sample_fmt));
2061 }
2062 break;
2063 case AVMEDIA_TYPE_DATA:
2064 snprintf(buf, buf_size, "Data: %s", codec_name);
2065 break;
2066 case AVMEDIA_TYPE_SUBTITLE:
2067 snprintf(buf, buf_size, "Subtitle: %s", codec_name);
2068 break;
2069 case AVMEDIA_TYPE_ATTACHMENT:
2070 snprintf(buf, buf_size, "Attachment: %s", codec_name);
2071 break;
2072 default:
2073 snprintf(buf, buf_size, "Invalid Codec type %d", enc->codec_type);
2074 return;
2075 }
2076 if (encode) {
2077 if (enc->flags & AV_CODEC_FLAG_PASS1)
2078 snprintf(buf + strlen(buf), buf_size - strlen(buf),
2079 ", pass 1");
2080 if (enc->flags & AV_CODEC_FLAG_PASS2)
2081 snprintf(buf + strlen(buf), buf_size - strlen(buf),
2082 ", pass 2");
2083 }
2084 bitrate = get_bit_rate(enc);
2085 if (bitrate != 0) {
2086 snprintf(buf + strlen(buf), buf_size - strlen(buf),
2087 ", %d kb/s", bitrate / 1000);
2088 }
2089 }
2090
2091 const char *av_get_profile_name(const AVCodec *codec, int profile)
2092 {
2093 const AVProfile *p;
2094 if (profile == FF_PROFILE_UNKNOWN || !codec->profiles)
2095 return NULL;
2096
2097 for (p = codec->profiles; p->profile != FF_PROFILE_UNKNOWN; p++)
2098 if (p->profile == profile)
2099 return p->name;
2100
2101 return NULL;
2102 }
2103
2104 unsigned avcodec_version(void)
2105 {
2106 return LIBAVCODEC_VERSION_INT;
2107 }
2108
2109 const char *avcodec_configuration(void)
2110 {
2111 return LIBAV_CONFIGURATION;
2112 }
2113
2114 const char *avcodec_license(void)
2115 {
2116 #define LICENSE_PREFIX "libavcodec license: "
2117 return LICENSE_PREFIX LIBAV_LICENSE + sizeof(LICENSE_PREFIX) - 1;
2118 }
2119
2120 void avcodec_flush_buffers(AVCodecContext *avctx)
2121 {
2122 if (HAVE_THREADS && avctx->active_thread_type & FF_THREAD_FRAME)
2123 ff_thread_flush(avctx);
2124 else if (avctx->codec->flush)
2125 avctx->codec->flush(avctx);
2126
2127 if (!avctx->refcounted_frames)
2128 av_frame_unref(avctx->internal->to_free);
2129 }
2130
2131 int av_get_exact_bits_per_sample(enum AVCodecID codec_id)
2132 {
2133 switch (codec_id) {
2134 case AV_CODEC_ID_ADPCM_CT:
2135 case AV_CODEC_ID_ADPCM_IMA_APC:
2136 case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:
2137 case AV_CODEC_ID_ADPCM_IMA_WS:
2138 case AV_CODEC_ID_ADPCM_G722:
2139 case AV_CODEC_ID_ADPCM_YAMAHA:
2140 return 4;
2141 case AV_CODEC_ID_PCM_ALAW:
2142 case AV_CODEC_ID_PCM_MULAW:
2143 case AV_CODEC_ID_PCM_S8:
2144 case AV_CODEC_ID_PCM_U8:
2145 case AV_CODEC_ID_PCM_ZORK:
2146 return 8;
2147 case AV_CODEC_ID_PCM_S16BE:
2148 case AV_CODEC_ID_PCM_S16BE_PLANAR:
2149 case AV_CODEC_ID_PCM_S16LE:
2150 case AV_CODEC_ID_PCM_S16LE_PLANAR:
2151 case AV_CODEC_ID_PCM_U16BE:
2152 case AV_CODEC_ID_PCM_U16LE:
2153 return 16;
2154 case AV_CODEC_ID_PCM_S24DAUD:
2155 case AV_CODEC_ID_PCM_S24BE:
2156 case AV_CODEC_ID_PCM_S24LE:
2157 case AV_CODEC_ID_PCM_S24LE_PLANAR:
2158 case AV_CODEC_ID_PCM_U24BE:
2159 case AV_CODEC_ID_PCM_U24LE:
2160 return 24;
2161 case AV_CODEC_ID_PCM_S32BE:
2162 case AV_CODEC_ID_PCM_S32LE:
2163 case AV_CODEC_ID_PCM_S32LE_PLANAR:
2164 case AV_CODEC_ID_PCM_U32BE:
2165 case AV_CODEC_ID_PCM_U32LE:
2166 case AV_CODEC_ID_PCM_F32BE:
2167 case AV_CODEC_ID_PCM_F32LE:
2168 return 32;
2169 case AV_CODEC_ID_PCM_F64BE:
2170 case AV_CODEC_ID_PCM_F64LE:
2171 return 64;
2172 default:
2173 return 0;
2174 }
2175 }
2176
2177 int av_get_bits_per_sample(enum AVCodecID codec_id)
2178 {
2179 switch (codec_id) {
2180 case AV_CODEC_ID_ADPCM_SBPRO_2:
2181 return 2;
2182 case AV_CODEC_ID_ADPCM_SBPRO_3:
2183 return 3;
2184 case AV_CODEC_ID_ADPCM_SBPRO_4:
2185 case AV_CODEC_ID_ADPCM_IMA_WAV:
2186 case AV_CODEC_ID_ADPCM_IMA_QT:
2187 case AV_CODEC_ID_ADPCM_SWF:
2188 case AV_CODEC_ID_ADPCM_MS:
2189 return 4;
2190 default:
2191 return av_get_exact_bits_per_sample(codec_id);
2192 }
2193 }
2194
2195 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes)
2196 {
2197 int id, sr, ch, ba, tag, bps;
2198
2199 id = avctx->codec_id;
2200 sr = avctx->sample_rate;
2201 ch = avctx->channels;
2202 ba = avctx->block_align;
2203 tag = avctx->codec_tag;
2204 bps = av_get_exact_bits_per_sample(avctx->codec_id);
2205
2206 /* codecs with an exact constant bits per sample */
2207 if (bps > 0 && ch > 0 && frame_bytes > 0)
2208 return (frame_bytes * 8) / (bps * ch);
2209 bps = avctx->bits_per_coded_sample;
2210
2211 /* codecs with a fixed packet duration */
2212 switch (id) {
2213 case AV_CODEC_ID_ADPCM_ADX: return 32;
2214 case AV_CODEC_ID_ADPCM_IMA_QT: return 64;
2215 case AV_CODEC_ID_ADPCM_EA_XAS: return 128;
2216 case AV_CODEC_ID_AMR_NB:
2217 case AV_CODEC_ID_GSM:
2218 case AV_CODEC_ID_QCELP:
2219 case AV_CODEC_ID_RA_144:
2220 case AV_CODEC_ID_RA_288: return 160;
2221 case AV_CODEC_ID_IMC: return 256;
2222 case AV_CODEC_ID_AMR_WB:
2223 case AV_CODEC_ID_GSM_MS: return 320;
2224 case AV_CODEC_ID_MP1: return 384;
2225 case AV_CODEC_ID_ATRAC1: return 512;
2226 case AV_CODEC_ID_ATRAC3: return 1024;
2227 case AV_CODEC_ID_MP2:
2228 case AV_CODEC_ID_MUSEPACK7: return 1152;
2229 case AV_CODEC_ID_AC3: return 1536;
2230 }
2231
2232 if (sr > 0) {
2233 /* calc from sample rate */
2234 if (id == AV_CODEC_ID_TTA)
2235 return 256 * sr / 245;
2236
2237 if (ch > 0) {
2238 /* calc from sample rate and channels */
2239 if (id == AV_CODEC_ID_BINKAUDIO_DCT)
2240 return (480 << (sr / 22050)) / ch;
2241 }
2242 }
2243
2244 if (ba > 0) {
2245 /* calc from block_align */
2246 if (id == AV_CODEC_ID_SIPR) {
2247 switch (ba) {
2248 case 20: return 160;
2249 case 19: return 144;
2250 case 29: return 288;
2251 case 37: return 480;
2252 }
2253 } else if (id == AV_CODEC_ID_ILBC) {
2254 switch (ba) {
2255 case 38: return 160;
2256 case 50: return 240;
2257 }
2258 }
2259 }
2260
2261 if (frame_bytes > 0) {
2262 /* calc from frame_bytes only */
2263 if (id == AV_CODEC_ID_TRUESPEECH)
2264 return 240 * (frame_bytes / 32);
2265 if (id == AV_CODEC_ID_NELLYMOSER)
2266 return 256 * (frame_bytes / 64);
2267
2268 if (bps > 0) {
2269 /* calc from frame_bytes and bits_per_coded_sample */
2270 if (id == AV_CODEC_ID_ADPCM_G726)
2271 return frame_bytes * 8 / bps;
2272 }
2273
2274 if (ch > 0) {
2275 /* calc from frame_bytes and channels */
2276 switch (id) {
2277 case AV_CODEC_ID_ADPCM_4XM:
2278 case AV_CODEC_ID_ADPCM_IMA_ISS:
2279 return (frame_bytes - 4 * ch) * 2 / ch;
2280 case AV_CODEC_ID_ADPCM_IMA_SMJPEG:
2281 return (frame_bytes - 4) * 2 / ch;
2282 case AV_CODEC_ID_ADPCM_IMA_AMV:
2283 return (frame_bytes - 8) * 2 / ch;
2284 case AV_CODEC_ID_ADPCM_XA:
2285 return (frame_bytes / 128) * 224 / ch;
2286 case AV_CODEC_ID_INTERPLAY_DPCM:
2287 return (frame_bytes - 6 - ch) / ch;
2288 case AV_CODEC_ID_ROQ_DPCM:
2289 return (frame_bytes - 8) / ch;
2290 case AV_CODEC_ID_XAN_DPCM:
2291 return (frame_bytes - 2 * ch) / ch;
2292 case AV_CODEC_ID_MACE3:
2293 return 3 * frame_bytes / ch;
2294 case AV_CODEC_ID_MACE6:
2295 return 6 * frame_bytes / ch;
2296 case AV_CODEC_ID_PCM_LXF:
2297 return 2 * (frame_bytes / (5 * ch));
2298 }
2299
2300 if (tag) {
2301 /* calc from frame_bytes, channels, and codec_tag */
2302 if (id == AV_CODEC_ID_SOL_DPCM) {
2303 if (tag == 3)
2304 return frame_bytes / ch;
2305 else
2306 return frame_bytes * 2 / ch;
2307 }
2308 }
2309
2310 if (ba > 0) {
2311 /* calc from frame_bytes, channels, and block_align */
2312 int blocks = frame_bytes / ba;
2313 switch (avctx->codec_id) {
2314 case AV_CODEC_ID_ADPCM_IMA_WAV:
2315 return blocks * (1 + (ba - 4 * ch) / (4 * ch) * 8);
2316 case AV_CODEC_ID_ADPCM_IMA_DK3:
2317 return blocks * (((ba - 16) * 2 / 3 * 4) / ch);
2318 case AV_CODEC_ID_ADPCM_IMA_DK4:
2319 return blocks * (1 + (ba - 4 * ch) * 2 / ch);
2320 case AV_CODEC_ID_ADPCM_MS:
2321 return blocks * (2 + (ba - 7 * ch) * 2 / ch);
2322 }
2323 }
2324
2325 if (bps > 0) {
2326 /* calc from frame_bytes, channels, and bits_per_coded_sample */
2327 switch (avctx->codec_id) {
2328 case AV_CODEC_ID_PCM_DVD:
2329 return 2 * (frame_bytes / ((bps * 2 / 8) * ch));
2330 case AV_CODEC_ID_PCM_BLURAY:
2331 return frame_bytes / ((FFALIGN(ch, 2) * bps) / 8);
2332 case AV_CODEC_ID_S302M:
2333 return 2 * (frame_bytes / ((bps + 4) / 4)) / ch;
2334 }
2335 }
2336 }
2337 }
2338
2339 return 0;
2340 }
2341
2342 #if !HAVE_THREADS
2343 int ff_thread_init(AVCodecContext *s)
2344 {
2345 return -1;
2346 }
2347
2348 #endif
2349
2350 unsigned int av_xiphlacing(unsigned char *s, unsigned int v)
2351 {
2352 unsigned int n = 0;
2353
2354 while (v >= 0xff) {
2355 *s++ = 0xff;
2356 v -= 0xff;
2357 n++;
2358 }
2359 *s = v;
2360 n++;
2361 return n;
2362 }
2363
2364 int ff_match_2uint16(const uint16_t(*tab)[2], int size, int a, int b)
2365 {
2366 int i;
2367 for (i = 0; i < size && !(tab[i][0] == a && tab[i][1] == b); i++) ;
2368 return i;
2369 }
2370
2371 #if FF_API_MISSING_SAMPLE
2372 FF_DISABLE_DEPRECATION_WARNINGS
2373 void av_log_missing_feature(void *avc, const char *feature, int want_sample)
2374 {
2375 av_log(avc, AV_LOG_WARNING, "%s is not implemented. Update your Libav "
2376 "version to the newest one from Git. If the problem still "
2377 "occurs, it means that your file has a feature which has not "
2378 "been implemented.\n", feature);
2379 if(want_sample)
2380 av_log_ask_for_sample(avc, NULL);
2381 }
2382
2383 void av_log_ask_for_sample(void *avc, const char *msg, ...)
2384 {
2385 va_list argument_list;
2386
2387 va_start(argument_list, msg);
2388
2389 if (msg)
2390 av_vlog(avc, AV_LOG_WARNING, msg, argument_list);
2391 av_log(avc, AV_LOG_WARNING, "If you want to help, upload a sample "
2392 "of this file to ftp://upload.libav.org/incoming/ "
2393 "and contact the libav-devel mailing list.\n");
2394
2395 va_end(argument_list);
2396 }
2397 FF_ENABLE_DEPRECATION_WARNINGS
2398 #endif /* FF_API_MISSING_SAMPLE */
2399
2400 static AVHWAccel *first_hwaccel = NULL;
2401
2402 void av_register_hwaccel(AVHWAccel *hwaccel)
2403 {
2404 AVHWAccel **p = &first_hwaccel;
2405 while (*p)
2406 p = &(*p)->next;
2407 *p = hwaccel;
2408 hwaccel->next = NULL;
2409 }
2410
2411 AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel)
2412 {
2413 return hwaccel ? hwaccel->next : first_hwaccel;
2414 }
2415
2416 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op))
2417 {
2418 if (lockmgr_cb) {
2419 // There is no good way to rollback a failure to destroy the
2420 // mutex, so we ignore failures.
2421 lockmgr_cb(&codec_mutex, AV_LOCK_DESTROY);
2422 lockmgr_cb(&avformat_mutex, AV_LOCK_DESTROY);
2423 lockmgr_cb = NULL;
2424 codec_mutex = NULL;
2425 avformat_mutex = NULL;
2426 }
2427
2428 if (cb) {
2429 void *new_codec_mutex = NULL;
2430 void *new_avformat_mutex = NULL;
2431 int err;
2432 if (err = cb(&new_codec_mutex, AV_LOCK_CREATE)) {
2433 return err > 0 ? AVERROR_UNKNOWN : err;
2434 }
2435 if (err = cb(&new_avformat_mutex, AV_LOCK_CREATE)) {
2436 // Ignore failures to destroy the newly created mutex.
2437 cb(&new_codec_mutex, AV_LOCK_DESTROY);
2438 return err > 0 ? AVERROR_UNKNOWN : err;
2439 }
2440 lockmgr_cb = cb;
2441 codec_mutex = new_codec_mutex;
2442 avformat_mutex = new_avformat_mutex;
2443 }
2444
2445 return 0;
2446 }
2447
2448 int avpriv_lock_avformat(void)
2449 {
2450 if (lockmgr_cb) {
2451 if ((*lockmgr_cb)(&avformat_mutex, AV_LOCK_OBTAIN))
2452 return -1;
2453 }
2454 return 0;
2455 }
2456
2457 int avpriv_unlock_avformat(void)
2458 {
2459 if (lockmgr_cb) {
2460 if ((*lockmgr_cb)(&avformat_mutex, AV_LOCK_RELEASE))
2461 return -1;
2462 }
2463 return 0;
2464 }
2465
2466 unsigned int avpriv_toupper4(unsigned int x)
2467 {
2468 return av_toupper(x & 0xFF) +
2469 (av_toupper((x >> 8) & 0xFF) << 8) +
2470 (av_toupper((x >> 16) & 0xFF) << 16) +
2471 (av_toupper((x >> 24) & 0xFF) << 24);
2472 }
2473
2474 int ff_thread_ref_frame(ThreadFrame *dst, ThreadFrame *src)
2475 {
2476 int ret;
2477
2478 dst->owner = src->owner;
2479
2480 ret = av_frame_ref(dst->f, src->f);
2481 if (ret < 0)
2482 return ret;
2483
2484 if (src->progress &&
2485 !(dst->progress = av_buffer_ref(src->progress))) {
2486 ff_thread_release_buffer(dst->owner, dst);
2487 return AVERROR(ENOMEM);
2488 }
2489
2490 return 0;
2491 }
2492
2493 #if !HAVE_THREADS
2494
2495 int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
2496 {
2497 f->owner = avctx;
2498 return ff_get_buffer(avctx, f->f, flags);
2499 }
2500
2501 void ff_thread_release_buffer(AVCodecContext *avctx, ThreadFrame *f)
2502 {
2503 if (f->f)
2504 av_frame_unref(f->f);
2505 }
2506
2507 void ff_thread_finish_setup(AVCodecContext *avctx)
2508 {
2509 }
2510
2511 void ff_thread_report_progress(ThreadFrame *f, int progress, int field)
2512 {
2513 }
2514
2515 void ff_thread_await_progress(ThreadFrame *f, int progress, int field)
2516 {
2517 }
2518
2519 #endif
2520
2521 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id)
2522 {
2523 if (codec_id <= AV_CODEC_ID_NONE)
2524 return AVMEDIA_TYPE_UNKNOWN;
2525 else if (codec_id < AV_CODEC_ID_FIRST_AUDIO)
2526 return AVMEDIA_TYPE_VIDEO;
2527 else if (codec_id < AV_CODEC_ID_FIRST_SUBTITLE)
2528 return AVMEDIA_TYPE_AUDIO;
2529 else if (codec_id < AV_CODEC_ID_FIRST_UNKNOWN)
2530 return AVMEDIA_TYPE_SUBTITLE;
2531
2532 return AVMEDIA_TYPE_UNKNOWN;
2533 }
2534
2535 int avcodec_is_open(AVCodecContext *s)
2536 {
2537 return !!s->internal;
2538 }
2539
2540 const uint8_t *avpriv_find_start_code(const uint8_t *restrict p,
2541 const uint8_t *end,
2542 uint32_t * restrict state)
2543 {
2544 int i;
2545
2546 assert(p <= end);
2547 if (p >= end)
2548 return end;
2549
2550 for (i = 0; i < 3; i++) {
2551 uint32_t tmp = *state << 8;
2552 *state = tmp + *(p++);
2553 if (tmp == 0x100 || p == end)
2554 return p;
2555 }
2556
2557 while (p < end) {
2558 if (p[-1] > 1 ) p += 3;
2559 else if (p[-2] ) p += 2;
2560 else if (p[-3]|(p[-1]-1)) p++;
2561 else {
2562 p++;
2563 break;
2564 }
2565 }
2566
2567 p = FFMIN(p, end) - 4;
2568 *state = AV_RB32(p);
2569
2570 return p + 4;
2571 }