FFmpeg
target_dec_fuzzer.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 /* Targeted fuzzer that targets specific codecs depending on two
20  compile-time flags.
21  INSTRUCTIONS:
22 
23  * Get the very fresh clang, e.g. see http://libfuzzer.info#versions
24  * Get and build libFuzzer:
25  svn co http://llvm.org/svn/llvm-project/llvm/trunk/lib/Fuzzer
26  ./Fuzzer/build.sh
27  * build ffmpeg for fuzzing:
28  FLAGS="-fsanitize=address -fsanitize-coverage=trace-pc-guard,trace-cmp -g" CC="clang $FLAGS" CXX="clang++ $FLAGS" ./configure --disable-x86asm
29  make clean && make -j
30  * build the fuzz target.
31  Choose the value of FFMPEG_CODEC (e.g. AV_CODEC_ID_DVD_SUBTITLE) and
32  choose one of FUZZ_FFMPEG_VIDEO, FUZZ_FFMPEG_AUDIO, FUZZ_FFMPEG_SUBTITLE.
33  clang -fsanitize=address -fsanitize-coverage=trace-pc-guard,trace-cmp tools/target_dec_fuzzer.c -o target_dec_fuzzer -I. -DFFMPEG_CODEC=AV_CODEC_ID_MPEG1VIDEO -DFUZZ_FFMPEG_VIDEO ../../libfuzzer/libFuzzer.a -Llibavcodec -Llibavdevice -Llibavfilter -Llibavformat -Llibavresample -Llibavutil -Llibpostproc -Llibswscale -Llibswresample -Wl,--as-needed -Wl,-z,noexecstack -Wl,--warn-common -Wl,-rpath-link=:libpostproc:libswresample:libswscale:libavfilter:libavdevice:libavformat:libavcodec:libavutil:libavresample -lavdevice -lavfilter -lavformat -lavcodec -lswresample -lswscale -lavutil -ldl -lxcb -lxcb-shm -lxcb -lxcb-xfixes -lxcb -lxcb-shape -lxcb -lX11 -lasound -lm -lbz2 -lz -pthread
34  * create a corpus directory and put some samples there (empty dir is ok too):
35  mkdir CORPUS && cp some-files CORPUS
36 
37  * Run fuzzing:
38  ./target_dec_fuzzer -max_len=100000 CORPUS
39 
40  More info:
41  http://libfuzzer.info
42  http://tutorial.libfuzzer.info
43  https://github.com/google/oss-fuzz
44  http://lcamtuf.coredump.cx/afl/
45  https://security.googleblog.com/2016/08/guided-in-process-fuzzing-of-chrome.html
46 */
47 
48 #include "config.h"
49 #include "libavutil/avassert.h"
50 #include "libavutil/imgutils.h"
51 #include "libavutil/intreadwrite.h"
52 
53 #include "libavcodec/avcodec.h"
54 #include "libavcodec/bytestream.h"
55 #include "libavformat/avformat.h"
56 
57 //For FF_SANE_NB_CHANNELS, so we dont waste energy testing things that will get instantly rejected
58 #include "libavcodec/internal.h"
59 
60 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
61 
62 extern AVCodec * codec_list[];
63 
64 static void error(const char *err)
65 {
66  fprintf(stderr, "%s", err);
67  exit(1);
68 }
69 
70 static AVCodec *c = NULL;
72 {
73  AVCodec *res;
74 
75  res = avcodec_find_decoder(codec_id);
76  if (!res)
77  error("Failed to find decoder");
78  return res;
79 }
80 
81 static int subtitle_handler(AVCodecContext *avctx, void *frame,
82  int *got_sub_ptr, AVPacket *avpkt)
83 {
84  AVSubtitle sub;
85  int ret = avcodec_decode_subtitle2(avctx, &sub, got_sub_ptr, avpkt);
86  if (ret >= 0 && *got_sub_ptr)
87  avsubtitle_free(&sub);
88  return ret;
89 }
90 
91 // Ensure we don't loop forever
92 const uint32_t maxiteration = 8096;
93 const uint64_t maxpixels_per_frame = 4096 * 4096;
94 uint64_t maxpixels;
95 
96 uint64_t maxsamples_per_frame = 256*1024*32;
97 uint64_t maxsamples;
98 
99 static const uint64_t FUZZ_TAG = 0x4741542D5A5A5546ULL;
100 
102  const uint64_t fuzz_tag = FUZZ_TAG;
103  const uint8_t *last = data;
104  const uint8_t *end = data + size;
105  uint32_t it = 0;
106  uint64_t ec_pixels = 0;
107  uint64_t nb_samples = 0;
108  int (*decode_handler)(AVCodecContext *avctx, AVFrame *picture,
109  int *got_picture_ptr,
110  const AVPacket *avpkt) = NULL;
111  AVCodecParserContext *parser = NULL;
112  uint64_t keyframes = 0;
114 
115  if (!c) {
116 #ifdef FFMPEG_DECODER
117 #define DECODER_SYMBOL0(CODEC) ff_##CODEC##_decoder
118 #define DECODER_SYMBOL(CODEC) DECODER_SYMBOL0(CODEC)
119  extern AVCodec DECODER_SYMBOL(FFMPEG_DECODER);
120  codec_list[0] = &DECODER_SYMBOL(FFMPEG_DECODER);
121  avcodec_register(&DECODER_SYMBOL(FFMPEG_DECODER));
122 
123 #if FFMPEG_DECODER == tiff || FFMPEG_DECODER == tdsc
124  extern AVCodec DECODER_SYMBOL(mjpeg);
125  codec_list[1] = &DECODER_SYMBOL(mjpeg);
126  avcodec_register(&DECODER_SYMBOL(mjpeg));
127 #endif
128 
129  c = &DECODER_SYMBOL(FFMPEG_DECODER);
130 #else
132  c = AVCodecInitialize(FFMPEG_CODEC); // Done once.
133 #endif
135  }
136 
137  switch (c->type) {
138  case AVMEDIA_TYPE_AUDIO : decode_handler = avcodec_decode_audio4; break;
139  case AVMEDIA_TYPE_VIDEO : decode_handler = avcodec_decode_video2; break;
140  case AVMEDIA_TYPE_SUBTITLE: decode_handler = subtitle_handler ; break;
141  }
142  switch (c->id) {
143  case AV_CODEC_ID_APE: maxsamples_per_frame /= 256; break;
144  }
147  switch (c->id) {
148  case AV_CODEC_ID_BINKVIDEO: maxpixels /= 32; break;
149  case AV_CODEC_ID_CFHD: maxpixels /= 128; break;
150  case AV_CODEC_ID_DIRAC: maxpixels /= 8192; break;
151  case AV_CODEC_ID_DST: maxsamples /= 8192; break;
152  case AV_CODEC_ID_DXV: maxpixels /= 32; break;
153  case AV_CODEC_ID_FFWAVESYNTH: maxsamples /= 16384; break;
154  case AV_CODEC_ID_G2M: maxpixels /= 64; break;
155  case AV_CODEC_ID_GDV: maxpixels /= 512; break;
156  case AV_CODEC_ID_GIF: maxpixels /= 16; break;
157  case AV_CODEC_ID_HAP: maxpixels /= 128; break;
158  case AV_CODEC_ID_HEVC: maxpixels /= 16384; break;
159  case AV_CODEC_ID_HNM4_VIDEO: maxpixels /= 128; break;
160  case AV_CODEC_ID_IFF_ILBM: maxpixels /= 128; break;
161  case AV_CODEC_ID_INDEO4: maxpixels /= 128; break;
162  case AV_CODEC_ID_LAGARITH: maxpixels /= 1024; break;
163  case AV_CODEC_ID_LSCR: maxpixels /= 16; break;
164  case AV_CODEC_ID_MOTIONPIXELS:maxpixels /= 256; break;
165  case AV_CODEC_ID_MP4ALS: maxsamples /= 65536; break;
166  case AV_CODEC_ID_MSRLE: maxpixels /= 16; break;
167  case AV_CODEC_ID_MSS2: maxpixels /= 16384; break;
168  case AV_CODEC_ID_MSZH: maxpixels /= 128; break;
169  case AV_CODEC_ID_PNG: maxpixels /= 128; break;
170  case AV_CODEC_ID_APNG: maxpixels /= 128; break;
171  case AV_CODEC_ID_QTRLE: maxpixels /= 16; break;
172  case AV_CODEC_ID_RASC: maxpixels /= 16; break;
173  case AV_CODEC_ID_SANM: maxpixels /= 16; break;
174  case AV_CODEC_ID_SCPR: maxpixels /= 32; break;
175  case AV_CODEC_ID_SCREENPRESSO:maxpixels /= 64; break;
176  case AV_CODEC_ID_SMACKVIDEO: maxpixels /= 64; break;
177  case AV_CODEC_ID_SNOW: maxpixels /= 128; break;
178  case AV_CODEC_ID_TGV: maxpixels /= 32; break;
179  case AV_CODEC_ID_TRUEMOTION2: maxpixels /= 1024; break;
180  case AV_CODEC_ID_VP7: maxpixels /= 256; break;
181  case AV_CODEC_ID_VP9: maxpixels /= 4096; break;
182  case AV_CODEC_ID_ZEROCODEC: maxpixels /= 128; break;
183  }
184 
185 
187  AVCodecContext* parser_avctx = avcodec_alloc_context3(NULL);
188  if (!ctx || !parser_avctx)
189  error("Failed memory allocation");
190 
191  if (ctx->max_pixels == 0 || ctx->max_pixels > maxpixels_per_frame)
192  ctx->max_pixels = maxpixels_per_frame; //To reduce false positive OOM and hangs
193  ctx->refcounted_frames = 1; //To reduce false positive timeouts and focus testing on the refcounted API
194 
196 
197  if (size > 1024) {
198  GetByteContext gbc;
199  int extradata_size;
200  int flags;
201  size -= 1024;
202  bytestream2_init(&gbc, data + size, 1024);
203  ctx->width = bytestream2_get_le32(&gbc);
204  ctx->height = bytestream2_get_le32(&gbc);
205  ctx->bit_rate = bytestream2_get_le64(&gbc);
206  ctx->bits_per_coded_sample = bytestream2_get_le32(&gbc);
207  // Try to initialize a parser for this codec, note, this may fail which just means we test without one
208  flags = bytestream2_get_byte(&gbc);
209  if (flags & 1)
210  parser = av_parser_init(c->id);
211  if (flags & 2)
213  if (flags & 4) {
215  if (flags & 8)
217  }
218  if ((flags & 0x10) && c->id != AV_CODEC_ID_H264)
219  ctx->flags2 |= AV_CODEC_FLAG2_FAST;
220 
221  if (flags & 0x40)
223 
224  extradata_size = bytestream2_get_le32(&gbc);
225 
226  ctx->sample_rate = bytestream2_get_le32(&gbc) & 0x7FFFFFFF;
227  ctx->channels = (unsigned)bytestream2_get_le32(&gbc) % FF_SANE_NB_CHANNELS;
228  ctx->block_align = bytestream2_get_le32(&gbc) & 0x7FFFFFFF;
229  ctx->codec_tag = bytestream2_get_le32(&gbc);
230  if (c->codec_tags) {
231  int n;
232  for (n = 0; c->codec_tags[n] != FF_CODEC_TAGS_END; n++);
233  ctx->codec_tag = c->codec_tags[ctx->codec_tag % n];
234  }
235  keyframes = bytestream2_get_le64(&gbc);
236  ctx->request_channel_layout = bytestream2_get_le64(&gbc);
237 
238  ctx->idct_algo = bytestream2_get_byte(&gbc) % 25;
239 
240  if (flags & 0x20) {
241  switch (ctx->codec_id) {
242  case AV_CODEC_ID_AC3:
243  case AV_CODEC_ID_EAC3:
244  av_dict_set_int(&opts, "cons_noisegen", bytestream2_get_byte(&gbc) & 1, 0);
245  av_dict_set_int(&opts, "heavy_compr", bytestream2_get_byte(&gbc) & 1, 0);
246  av_dict_set_int(&opts, "target_level", (int)(bytestream2_get_byte(&gbc) % 32) - 31, 0);
247  av_dict_set_int(&opts, "dmix_mode", (int)(bytestream2_get_byte(&gbc) % 4) - 1, 0);
248  break;
249  }
250  }
251 
252 
253  if (extradata_size < size) {
254  ctx->extradata = av_mallocz(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
255  if (ctx->extradata) {
256  ctx->extradata_size = extradata_size;
257  size -= ctx->extradata_size;
258  memcpy(ctx->extradata, data + size, ctx->extradata_size);
259  }
260  }
261  if (av_image_check_size(ctx->width, ctx->height, 0, ctx))
262  ctx->width = ctx->height = 0;
263  }
264 
265  int res = avcodec_open2(ctx, c, &opts);
266  if (res < 0) {
267  avcodec_free_context(&ctx);
268  av_free(parser_avctx);
269  av_parser_close(parser);
270  av_dict_free(&opts);
271  return 0; // Failure of avcodec_open2() does not imply that a issue was found
272  }
273  parser_avctx->codec_id = ctx->codec_id;
274 
275  int got_frame;
277  if (!frame)
278  error("Failed memory allocation");
279 
280  // Read very simple container
281  AVPacket avpkt, parsepkt;
282  av_init_packet(&avpkt);
283  av_init_packet(&parsepkt);
284  while (data < end && it < maxiteration) {
285  // Search for the TAG
286  while (data + sizeof(fuzz_tag) < end) {
287  if (data[0] == (fuzz_tag & 0xFF) && AV_RN64(data) == fuzz_tag)
288  break;
289  data++;
290  }
291  if (data + sizeof(fuzz_tag) > end)
292  data = end;
293 
294  res = av_new_packet(&parsepkt, data - last);
295  if (res < 0)
296  error("Failed memory allocation");
297  memcpy(parsepkt.data, last, data - last);
298  parsepkt.flags = (keyframes & 1) * AV_PKT_FLAG_DISCARD + (!!(keyframes & 2)) * AV_PKT_FLAG_KEY;
299  keyframes = (keyframes >> 2) + (keyframes<<62);
300  data += sizeof(fuzz_tag);
301  last = data;
302 
303  while (parsepkt.size > 0) {
304 
305  if (parser) {
306  av_init_packet(&avpkt);
307  int ret = av_parser_parse2(parser, parser_avctx, &avpkt.data, &avpkt.size,
308  parsepkt.data, parsepkt.size,
309  parsepkt.pts, parsepkt.dts, parsepkt.pos);
310  if (avpkt.data == parsepkt.data) {
311  avpkt.buf = av_buffer_ref(parsepkt.buf);
312  if (!avpkt.buf)
313  error("Failed memory allocation");
314  } else {
315  if (av_packet_make_refcounted(&avpkt) < 0)
316  error("Failed memory allocation");
317  }
318  parsepkt.data += ret;
319  parsepkt.size -= ret;
320  parsepkt.pos += ret;
321  avpkt.pts = parser->pts;
322  avpkt.dts = parser->dts;
323  avpkt.pos = parser->pos;
324  if ( parser->key_frame == 1 ||
325  (parser->key_frame == -1 && parser->pict_type == AV_PICTURE_TYPE_I))
326  avpkt.flags |= AV_PKT_FLAG_KEY;
327  avpkt.flags |= parsepkt.flags & AV_PKT_FLAG_DISCARD;
328  } else {
329  av_packet_move_ref(&avpkt, &parsepkt);
330  }
331 
332  // Iterate through all data
333  while (avpkt.size > 0 && it++ < maxiteration) {
334  av_frame_unref(frame);
335  int ret = decode_handler(ctx, frame, &got_frame, &avpkt);
336 
337  ec_pixels += (ctx->width + 32LL) * (ctx->height + 32LL);
338  if (it > 20 || ec_pixels > 4 * ctx->max_pixels)
339  ctx->error_concealment = 0;
340  if (ec_pixels > maxpixels)
341  goto maximums_reached;
342 
343  nb_samples += frame->nb_samples;
344  if (nb_samples > maxsamples)
345  goto maximums_reached;
346 
347  if (ret <= 0 || ret > avpkt.size)
348  break;
349  if (ctx->codec_type != AVMEDIA_TYPE_AUDIO)
350  ret = avpkt.size;
351  avpkt.data += ret;
352  avpkt.size -= ret;
353  }
354  av_packet_unref(&avpkt);
355  }
356  av_packet_unref(&parsepkt);
357  }
358 maximums_reached:
359 
360  av_packet_unref(&avpkt);
361 
362  do {
363  got_frame = 0;
364  av_frame_unref(frame);
365  decode_handler(ctx, frame, &got_frame, &avpkt);
366  } while (got_frame == 1 && it++ < maxiteration);
367 
368  fprintf(stderr, "pixels decoded: %"PRId64", samples decoded: %"PRId64", iterations: %d\n", ec_pixels, nb_samples, it);
369 
370  av_frame_free(&frame);
371  avcodec_free_context(&ctx);
372  avcodec_free_context(&parser_avctx);
373  av_parser_close(parser);
374  av_packet_unref(&parsepkt);
375  av_dict_free(&opts);
376  return 0;
377 }
#define FF_SANE_NB_CHANNELS
Definition: internal.h:97
#define FF_COMPLIANCE_EXPERIMENTAL
Allow nonstandardized experimental things.
Definition: avcodec.h:1594
const uint32_t maxiteration
#define AV_EF_AGGRESSIVE
consider things that a sane encoder should not do as an error
Definition: avcodec.h:1671
#define NULL
Definition: coverity.c:32
This structure describes decoded (raw) audio or video data.
Definition: frame.h:308
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
uint64_t maxsamples
misc image utilities
int64_t bit_rate
the average bitrate
Definition: avcodec.h:576
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:375
void av_log_set_level(int level)
Set the log level.
Definition: log.c:440
int size
Definition: packet.h:356
#define AV_EF_COMPLIANT
consider all spec non compliances as errors
Definition: avcodec.h:1670
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
attribute_deprecated int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, const AVPacket *avpkt)
Decode the audio frame of size avpkt->size from avpkt->data into frame.
Definition: decode.c:813
enum AVMediaType type
Definition: codec.h:203
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:237
int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub, int *got_sub_ptr, AVPacket *avpkt)
Decode a subtitle message.
Definition: decode.c:978
AVCodec.
Definition: codec.h:190
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:1223
uint8_t
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:190
#define AV_LOG_PANIC
Something went really wrong and we will crash now.
Definition: log.h:181
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:627
uint8_t * data
Definition: packet.h:355
s EdgeDetect Foobar g libavfilter vf_edgedetect c libavfilter vf_foobar c edit libavfilter and add an entry for foobar following the pattern of the other filters edit libavfilter allfilters and add an entry for foobar following the pattern of the other filters configure make j< whatever > ffmpeg ffmpeg i you should get a foobar png with Lena edge detected That s it
void av_packet_move_ref(AVPacket *dst, AVPacket *src)
Move every field in src to dst and reset src.
Definition: avpacket.c:663
av_cold void avcodec_register(AVCodec *codec)
Register the codec codec and initialize libavcodec.
Definition: allcodecs.c:863
ptrdiff_t size
Definition: opengl_enc.c:100
const uint32_t * codec_tags
List of supported codec_tags, terminated by FF_CODEC_TAGS_END.
Definition: codec.h:326
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:1750
void avcodec_register_all(void)
Register all the codecs, parsers and bitstream filters which were enabled at configuration time...
Definition: allcodecs.c:878
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:388
static AVCodec * c
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:88
enum AVCodecID id
Definition: codec.h:204
static const uint64_t FUZZ_TAG
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:46
int64_t pos
Byte position of currently parsed frame in stream.
Definition: avcodec.h:3463
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:203
int error_concealment
error concealment flags
Definition: avcodec.h:1601
void av_dict_free(AVDictionary **pm)
Free all the memory allocated for an AVDictionary struct and all keys and values. ...
Definition: dict.c:203
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
Definition: packet.h:338
simple assert() macros that are a bit more flexible than ISO C assert().
int64_t max_pixels
The number of pixels per image to maximally accept.
Definition: avcodec.h:2256
const uint64_t maxpixels_per_frame
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:361
AVDictionary * opts
Definition: movenc.c:50
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of the image can be address...
Definition: imgutils.c:282
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:1655
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
Definition: options.c:172
int av_parser_parse2(AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int64_t pts, int64_t dts, int64_t pos)
Parse a packet.
Definition: parser.c:120
static AVCodec * AVCodecInitialize(enum AVCodecID codec_id)
int width
picture width / height.
Definition: avcodec.h:699
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:1729
int av_packet_make_refcounted(AVPacket *pkt)
Ensure the data described by a given packet is reference counted.
Definition: avpacket.c:671
AVFormatContext * ctx
Definition: movenc.c:48
void av_parser_close(AVCodecParserContext *s)
Definition: parser.c:224
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:1666
enum AVCodecID codec_id
Definition: vaapi_decode.c:369
static void error(const char *err)
static int subtitle_handler(AVCodecContext *avctx, void *frame, int *got_sub_ptr, AVPacket *avpkt)
AVCodecParserContext * av_parser_init(int codec_id)
Definition: parser.c:34
Libavcodec external API header.
enum AVMediaType codec_type
Definition: avcodec.h:534
attribute_deprecated int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture, int *got_picture_ptr, const AVPacket *avpkt)
Decode the video frame of size avpkt->size from avpkt->data into picture.
Definition: decode.c:806
void avcodec_free_context(AVCodecContext **avctx)
Free the codec context and everything associated with it and write NULL to the provided pointer...
Definition: options.c:187
enum AVCodecID codec_id
Definition: avcodec.h:536
int sample_rate
samples per second
Definition: avcodec.h:1186
#define AV_CODEC_FLAG2_FAST
Allow non spec compliant speedup tricks.
Definition: avcodec.h:348
main external API structure.
Definition: avcodec.h:526
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:605
void avsubtitle_free(AVSubtitle *sub)
Free all allocated data in the given subtitle struct.
Definition: utils.c:1109
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> (&#39;D&#39;<<24) + (&#39;C&#39;<<16) + (&#39;B&#39;<<8) + &#39;A&#39;).
Definition: avcodec.h:551
int64_t max_samples
The number of samples per frame to maximally accept.
Definition: avcodec.h:2344
int extradata_size
Definition: avcodec.h:628
#define AV_EF_CAREFUL
consider things that violate the spec, are fast to calculate and have not been seen in the wild as er...
Definition: avcodec.h:1669
int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
Definition: utils.c:549
attribute_deprecated int refcounted_frames
If non-zero, the decoded audio and video frames returned from avcodec_decode_video2() and avcodec_dec...
Definition: avcodec.h:1357
AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
Definition: allcodecs.c:920
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:554
#define flags(name, subs,...)
Definition: cbs_av1.c:560
Main libavformat public API header.
int
#define AV_PKT_FLAG_DISCARD
Flag is used to discard packets which are required to maintain valid decoder state but are not requir...
Definition: packet.h:395
common internal api header.
int av_dict_set_int(AVDictionary **pm, const char *key, int64_t value, int flags)
Convenience wrapper for av_dict_set that converts the value to a string and stores it...
Definition: dict.c:147
AVBufferRef * av_buffer_ref(AVBufferRef *buf)
Create a new reference to an AVBuffer.
Definition: buffer.c:93
void av_init_packet(AVPacket *pkt)
Initialize optional fields of a packet with default values.
Definition: avpacket.c:35
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:215
#define av_free(p)
uint64_t maxpixels
int channels
number of audio channels
Definition: avcodec.h:1187
#define AV_RN64(p)
Definition: intreadwrite.h:368
int flags2
AV_CODEC_FLAG2_*.
Definition: avcodec.h:613
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: packet.h:354
#define FF_CODEC_TAGS_END
AVCodec.codec_tags termination value.
Definition: internal.h:80
void av_force_cpu_flags(int arg)
Disables cpu detection and forces the specified flags.
Definition: cpu.c:65
uint64_t maxsamples_per_frame
uint64_t request_channel_layout
Request decoder to use this channel layout if it can (0 for default)
Definition: avcodec.h:1244
This structure stores compressed data.
Definition: packet.h:332
int key_frame
Set by parser to 1 for key frames and 0 for non-key frames.
Definition: avcodec.h:3402
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:374
int strict_std_compliance
strictly follow the standard (MPEG-4, ...).
Definition: avcodec.h:1589
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:348
AVCodec * codec_list[]