FFmpeg  4.4.6
ape.c
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1 /*
2  * Monkey's Audio APE demuxer
3  * Copyright (c) 2007 Benjamin Zores <ben@geexbox.org>
4  * based upon libdemac from Dave Chapman.
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg 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  * FFmpeg 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 FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include <stdio.h>
24 
25 #include "libavutil/intreadwrite.h"
26 #include "avformat.h"
27 #include "internal.h"
28 #include "apetag.h"
29 
30 /* The earliest and latest file formats supported by this library */
31 #define APE_MIN_VERSION 3800
32 #define APE_MAX_VERSION 3990
33 
34 #define MAC_FORMAT_FLAG_8_BIT 1 // is 8-bit [OBSOLETE]
35 #define MAC_FORMAT_FLAG_CRC 2 // uses the new CRC32 error detection [OBSOLETE]
36 #define MAC_FORMAT_FLAG_HAS_PEAK_LEVEL 4 // uint32 nPeakLevel after the header [OBSOLETE]
37 #define MAC_FORMAT_FLAG_24_BIT 8 // is 24-bit [OBSOLETE]
38 #define MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS 16 // has the number of seek elements after the peak level
39 #define MAC_FORMAT_FLAG_CREATE_WAV_HEADER 32 // create the wave header on decompression (not stored)
40 
41 #define APE_EXTRADATA_SIZE 6
42 
43 typedef struct APEFrame {
46  int nblocks;
47  int skip;
49 } APEFrame;
50 
51 typedef struct APEContext {
52  /* Derived fields */
53  uint32_t junklength;
54  uint32_t firstframe;
55  uint32_t totalsamples;
58 
59  /* Info from Descriptor Block */
60  int16_t fileversion;
61  int16_t padding1;
62  uint32_t descriptorlength;
63  uint32_t headerlength;
64  uint32_t seektablelength;
65  uint32_t wavheaderlength;
66  uint32_t audiodatalength;
68  uint32_t wavtaillength;
69  uint8_t md5[16];
70 
71  /* Info from Header Block */
72  uint16_t compressiontype;
73  uint16_t formatflags;
74  uint32_t blocksperframe;
75  uint32_t finalframeblocks;
76  uint32_t totalframes;
77  uint16_t bps;
78  uint16_t channels;
79  uint32_t samplerate;
80 } APEContext;
81 
82 static int ape_read_close(AVFormatContext * s);
83 
84 static int ape_probe(const AVProbeData * p)
85 {
86  int version = AV_RL16(p->buf+4);
87  if (AV_RL32(p->buf) != MKTAG('M', 'A', 'C', ' '))
88  return 0;
89 
90  if (version < APE_MIN_VERSION || version > APE_MAX_VERSION)
91  return AVPROBE_SCORE_MAX/4;
92 
93  return AVPROBE_SCORE_MAX;
94 }
95 
96 static void ape_dumpinfo(AVFormatContext * s, APEContext * ape_ctx)
97 {
98 #ifdef DEBUG
99  int i;
100 
101  av_log(s, AV_LOG_DEBUG, "Descriptor Block:\n\n");
102  av_log(s, AV_LOG_DEBUG, "fileversion = %"PRId16"\n", ape_ctx->fileversion);
103  av_log(s, AV_LOG_DEBUG, "descriptorlength = %"PRIu32"\n", ape_ctx->descriptorlength);
104  av_log(s, AV_LOG_DEBUG, "headerlength = %"PRIu32"\n", ape_ctx->headerlength);
105  av_log(s, AV_LOG_DEBUG, "seektablelength = %"PRIu32"\n", ape_ctx->seektablelength);
106  av_log(s, AV_LOG_DEBUG, "wavheaderlength = %"PRIu32"\n", ape_ctx->wavheaderlength);
107  av_log(s, AV_LOG_DEBUG, "audiodatalength = %"PRIu32"\n", ape_ctx->audiodatalength);
108  av_log(s, AV_LOG_DEBUG, "audiodatalength_high = %"PRIu32"\n", ape_ctx->audiodatalength_high);
109  av_log(s, AV_LOG_DEBUG, "wavtaillength = %"PRIu32"\n", ape_ctx->wavtaillength);
110  av_log(s, AV_LOG_DEBUG, "md5 = ");
111  for (i = 0; i < 16; i++)
112  av_log(s, AV_LOG_DEBUG, "%02x", ape_ctx->md5[i]);
113  av_log(s, AV_LOG_DEBUG, "\n");
114 
115  av_log(s, AV_LOG_DEBUG, "\nHeader Block:\n\n");
116 
117  av_log(s, AV_LOG_DEBUG, "compressiontype = %"PRIu16"\n", ape_ctx->compressiontype);
118  av_log(s, AV_LOG_DEBUG, "formatflags = %"PRIu16"\n", ape_ctx->formatflags);
119  av_log(s, AV_LOG_DEBUG, "blocksperframe = %"PRIu32"\n", ape_ctx->blocksperframe);
120  av_log(s, AV_LOG_DEBUG, "finalframeblocks = %"PRIu32"\n", ape_ctx->finalframeblocks);
121  av_log(s, AV_LOG_DEBUG, "totalframes = %"PRIu32"\n", ape_ctx->totalframes);
122  av_log(s, AV_LOG_DEBUG, "bps = %"PRIu16"\n", ape_ctx->bps);
123  av_log(s, AV_LOG_DEBUG, "channels = %"PRIu16"\n", ape_ctx->channels);
124  av_log(s, AV_LOG_DEBUG, "samplerate = %"PRIu32"\n", ape_ctx->samplerate);
125 
126  av_log(s, AV_LOG_DEBUG, "\nSeektable\n\n");
127  if ((ape_ctx->seektablelength / sizeof(uint32_t)) != ape_ctx->totalframes) {
128  av_log(s, AV_LOG_DEBUG, "No seektable\n");
129  }
130 
131  av_log(s, AV_LOG_DEBUG, "\nFrames\n\n");
132  for (i = 0; i < ape_ctx->totalframes; i++)
133  av_log(s, AV_LOG_DEBUG, "%8d %8"PRId64" %8"PRId64" (%d samples)\n", i,
134  ape_ctx->frames[i].pos, ape_ctx->frames[i].size,
135  ape_ctx->frames[i].nblocks);
136 
137  av_log(s, AV_LOG_DEBUG, "\nCalculated information:\n\n");
138  av_log(s, AV_LOG_DEBUG, "junklength = %"PRIu32"\n", ape_ctx->junklength);
139  av_log(s, AV_LOG_DEBUG, "firstframe = %"PRIu32"\n", ape_ctx->firstframe);
140  av_log(s, AV_LOG_DEBUG, "totalsamples = %"PRIu32"\n", ape_ctx->totalsamples);
141 #endif
142 }
143 
145 {
146  AVIOContext *pb = s->pb;
147  APEContext *ape = s->priv_data;
148  AVStream *st;
149  uint32_t tag;
150  int i, ret;
151  int total_blocks;
152  int64_t final_size = 0;
153  int64_t pts, file_size;
154 
155  /* Skip any leading junk such as id3v2 tags */
156  ape->junklength = avio_tell(pb);
157 
158  tag = avio_rl32(pb);
159  if (tag != MKTAG('M', 'A', 'C', ' '))
160  return AVERROR_INVALIDDATA;
161 
162  ape->fileversion = avio_rl16(pb);
163 
165  av_log(s, AV_LOG_ERROR, "Unsupported file version - %d.%02d\n",
166  ape->fileversion / 1000, (ape->fileversion % 1000) / 10);
167  return AVERROR_PATCHWELCOME;
168  }
169 
170  if (ape->fileversion >= 3980) {
171  ape->padding1 = avio_rl16(pb);
172  ape->descriptorlength = avio_rl32(pb);
173  ape->headerlength = avio_rl32(pb);
174  ape->seektablelength = avio_rl32(pb);
175  ape->wavheaderlength = avio_rl32(pb);
176  ape->audiodatalength = avio_rl32(pb);
177  ape->audiodatalength_high = avio_rl32(pb);
178  ape->wavtaillength = avio_rl32(pb);
179  avio_read(pb, ape->md5, 16);
180 
181  /* Skip any unknown bytes at the end of the descriptor.
182  This is for future compatibility */
183  if (ape->descriptorlength > 52)
184  avio_skip(pb, ape->descriptorlength - 52);
185 
186  /* Read header data */
187  ape->compressiontype = avio_rl16(pb);
188  ape->formatflags = avio_rl16(pb);
189  ape->blocksperframe = avio_rl32(pb);
190  ape->finalframeblocks = avio_rl32(pb);
191  ape->totalframes = avio_rl32(pb);
192  ape->bps = avio_rl16(pb);
193  ape->channels = avio_rl16(pb);
194  ape->samplerate = avio_rl32(pb);
195  } else {
196  ape->descriptorlength = 0;
197  ape->headerlength = 32;
198 
199  ape->compressiontype = avio_rl16(pb);
200  ape->formatflags = avio_rl16(pb);
201  ape->channels = avio_rl16(pb);
202  ape->samplerate = avio_rl32(pb);
203  ape->wavheaderlength = avio_rl32(pb);
204  ape->wavtaillength = avio_rl32(pb);
205  ape->totalframes = avio_rl32(pb);
206  ape->finalframeblocks = avio_rl32(pb);
207 
209  avio_skip(pb, 4); /* Skip the peak level */
210  ape->headerlength += 4;
211  }
212 
214  ape->seektablelength = avio_rl32(pb);
215  ape->headerlength += 4;
216  ape->seektablelength *= sizeof(int32_t);
217  } else
218  ape->seektablelength = ape->totalframes * sizeof(int32_t);
219 
221  ape->bps = 8;
222  else if (ape->formatflags & MAC_FORMAT_FLAG_24_BIT)
223  ape->bps = 24;
224  else
225  ape->bps = 16;
226 
227  if (ape->fileversion >= 3950)
228  ape->blocksperframe = 73728 * 4;
229  else if (ape->fileversion >= 3900 || (ape->fileversion >= 3800 && ape->compressiontype >= 4000))
230  ape->blocksperframe = 73728;
231  else
232  ape->blocksperframe = 9216;
233 
234  /* Skip any stored wav header */
236  avio_skip(pb, ape->wavheaderlength);
237  }
238 
239  if(!ape->totalframes || pb->eof_reached){
240  av_log(s, AV_LOG_ERROR, "No frames in the file!\n");
241  return AVERROR(EINVAL);
242  }
243  if(ape->totalframes > UINT_MAX / sizeof(APEFrame)){
244  av_log(s, AV_LOG_ERROR, "Too many frames: %"PRIu32"\n",
245  ape->totalframes);
246  return AVERROR_INVALIDDATA;
247  }
248  if (ape->seektablelength / sizeof(uint32_t) < ape->totalframes) {
250  "Number of seek entries is less than number of frames: %"SIZE_SPECIFIER" vs. %"PRIu32"\n",
251  ape->seektablelength / sizeof(uint32_t), ape->totalframes);
252  return AVERROR_INVALIDDATA;
253  }
254  ape->frames = av_malloc_array(ape->totalframes, sizeof(APEFrame));
255  if(!ape->frames)
256  return AVERROR(ENOMEM);
257  ape->firstframe = ape->junklength + ape->descriptorlength + ape->headerlength + ape->seektablelength + ape->wavheaderlength;
258  if (ape->fileversion < 3810)
259  ape->firstframe += ape->totalframes;
260  ape->currentframe = 0;
261 
262 
263  ape->totalsamples = ape->finalframeblocks;
264  if (ape->totalframes > 1)
265  ape->totalsamples += ape->blocksperframe * (ape->totalframes - 1);
266 
267  ape->frames[0].pos = ape->firstframe;
268  ape->frames[0].nblocks = ape->blocksperframe;
269  ape->frames[0].skip = 0;
270  avio_rl32(pb); // seektable[0]
271  for (i = 1; i < ape->totalframes; i++) {
272  uint32_t seektable_entry = avio_rl32(pb);
273  ape->frames[i].pos = seektable_entry + ape->junklength;
274  ape->frames[i].nblocks = ape->blocksperframe;
275  ape->frames[i - 1].size = ape->frames[i].pos - ape->frames[i - 1].pos;
276  ape->frames[i].skip = (ape->frames[i].pos - ape->frames[0].pos) & 3;
277 
278  if (pb->eof_reached) {
279  av_log(s, AV_LOG_ERROR, "seektable truncated\n");
280  ret = AVERROR_INVALIDDATA;
281  goto fail;
282  }
283  ff_dlog(s, "seektable: %8d %"PRIu32"\n", i, seektable_entry);
284  }
285  avio_skip(pb, ape->seektablelength / sizeof(uint32_t) - ape->totalframes);
286 
287  ape->frames[ape->totalframes - 1].nblocks = ape->finalframeblocks;
288  /* calculate final packet size from total file size, if available */
289  file_size = avio_size(pb);
290  if (file_size > 0) {
291  final_size = file_size - ape->frames[ape->totalframes - 1].pos -
292  ape->wavtaillength;
293  final_size -= final_size & 3;
294  }
295  if (file_size <= 0 || final_size <= 0)
296  final_size = ape->finalframeblocks * 8LL;
297  ape->frames[ape->totalframes - 1].size = final_size;
298 
299  for (i = 0; i < ape->totalframes; i++) {
300  if(ape->frames[i].skip){
301  ape->frames[i].pos -= ape->frames[i].skip;
302  ape->frames[i].size += ape->frames[i].skip;
303  }
304  if (ape->frames[i].size > INT_MAX - 3)
305  return AVERROR_INVALIDDATA;
306  ape->frames[i].size = (ape->frames[i].size + 3) & ~3;
307  }
308  if (ape->fileversion < 3810) {
309  for (i = 0; i < ape->totalframes; i++) {
310  int bits = avio_r8(pb);
311  if (i && bits)
312  ape->frames[i - 1].size += 4;
313 
314  ape->frames[i].skip <<= 3;
315  ape->frames[i].skip += bits;
316  ff_dlog(s, "bittable: %2d\n", bits);
317  if (pb->eof_reached) {
318  av_log(s, AV_LOG_ERROR, "bittable truncated\n");
319  ret = AVERROR_INVALIDDATA;
320  goto fail;
321  }
322  }
323  }
324 
325  ape_dumpinfo(s, ape);
326 
327  av_log(s, AV_LOG_VERBOSE, "Decoding file - v%d.%02d, compression level %"PRIu16"\n",
328  ape->fileversion / 1000, (ape->fileversion % 1000) / 10,
329  ape->compressiontype);
330 
331  /* now we are ready: build format streams */
332  st = avformat_new_stream(s, NULL);
333  if (!st) {
334  ret = AVERROR(ENOMEM);
335  goto fail;
336  }
337 
338  total_blocks = (ape->totalframes == 0) ? 0 : ((ape->totalframes - 1) * ape->blocksperframe) + ape->finalframeblocks;
339 
342  st->codecpar->codec_tag = MKTAG('A', 'P', 'E', ' ');
343  st->codecpar->channels = ape->channels;
344  st->codecpar->sample_rate = ape->samplerate;
345  st->codecpar->bits_per_coded_sample = ape->bps;
346 
347  st->nb_frames = ape->totalframes;
348  st->start_time = 0;
349  st->duration = total_blocks;
350  avpriv_set_pts_info(st, 64, 1, ape->samplerate);
351 
352  if ((ret = ff_alloc_extradata(st->codecpar, APE_EXTRADATA_SIZE)) < 0)
353  goto fail;
354  AV_WL16(st->codecpar->extradata + 0, ape->fileversion);
355  AV_WL16(st->codecpar->extradata + 2, ape->compressiontype);
356  AV_WL16(st->codecpar->extradata + 4, ape->formatflags);
357 
358  pts = 0;
359  for (i = 0; i < ape->totalframes; i++) {
360  ape->frames[i].pts = pts;
361  av_add_index_entry(st, ape->frames[i].pos, ape->frames[i].pts, 0, 0, AVINDEX_KEYFRAME);
362  pts += ape->blocksperframe;
363  }
364 
365  /* try to read APE tags */
366  if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
368  avio_seek(pb, 0, SEEK_SET);
369  }
370 
371  return 0;
372 fail:
373  ape_read_close(s);
374 
375  return ret;
376 }
377 
379 {
380  int ret;
381  int nblocks;
382  APEContext *ape = s->priv_data;
383  uint32_t extra_size = 8;
384  int64_t ret64;
385 
386  if (avio_feof(s->pb))
387  return AVERROR_EOF;
388  if (ape->currentframe >= ape->totalframes)
389  return AVERROR_EOF;
390 
391  ret64 = avio_seek(s->pb, ape->frames[ape->currentframe].pos, SEEK_SET);
392  if (ret64 < 0)
393  return ret64;
394 
395  /* Calculate how many blocks there are in this frame */
396  if (ape->currentframe == (ape->totalframes - 1))
397  nblocks = ape->finalframeblocks;
398  else
399  nblocks = ape->blocksperframe;
400 
401  if (ape->frames[ape->currentframe].size <= 0 ||
402  ape->frames[ape->currentframe].size > INT_MAX - extra_size) {
403  av_log(s, AV_LOG_ERROR, "invalid packet size: %8"PRId64"\n",
404  ape->frames[ape->currentframe].size);
405  ape->currentframe++;
406  return AVERROR(EIO);
407  }
408 
409  ret = av_new_packet(pkt, ape->frames[ape->currentframe].size + extra_size);
410  if (ret < 0)
411  return ret;
412 
413  AV_WL32(pkt->data , nblocks);
414  AV_WL32(pkt->data + 4, ape->frames[ape->currentframe].skip);
415  ret = avio_read(s->pb, pkt->data + extra_size, ape->frames[ape->currentframe].size);
416  if (ret < 0) {
417  return ret;
418  }
419 
420  pkt->pts = ape->frames[ape->currentframe].pts;
421  pkt->stream_index = 0;
422 
423  /* note: we need to modify the packet size here to handle the last
424  packet */
425  pkt->size = ret + extra_size;
426 
427  ape->currentframe++;
428 
429  return 0;
430 }
431 
433 {
434  APEContext *ape = s->priv_data;
435 
436  av_freep(&ape->frames);
437  return 0;
438 }
439 
440 static int ape_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
441 {
442  AVStream *st = s->streams[stream_index];
443  APEContext *ape = s->priv_data;
444  int index = av_index_search_timestamp(st, timestamp, flags);
445  int64_t ret;
446 
447  if (index < 0)
448  return -1;
449 
450  if ((ret = avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET)) < 0)
451  return ret;
452  ape->currentframe = index;
453  return 0;
454 }
455 
457  .name = "ape",
458  .long_name = NULL_IF_CONFIG_SMALL("Monkey's Audio"),
459  .priv_data_size = sizeof(APEContext),
465  .extensions = "ape,apl,mac",
466 };
#define MAC_FORMAT_FLAG_8_BIT
Definition: ape.c:34
#define MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS
Definition: ape.c:38
AVInputFormat ff_ape_demuxer
Definition: ape.c:456
#define MAC_FORMAT_FLAG_24_BIT
Definition: ape.c:37
#define APE_EXTRADATA_SIZE
Definition: ape.c:41
static int ape_probe(const AVProbeData *p)
Definition: ape.c:84
#define MAC_FORMAT_FLAG_CREATE_WAV_HEADER
Definition: ape.c:39
static int ape_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: ape.c:378
static int ape_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: ape.c:440
static void ape_dumpinfo(AVFormatContext *s, APEContext *ape_ctx)
Definition: ape.c:96
static int ape_read_header(AVFormatContext *s)
Definition: ape.c:144
#define APE_MAX_VERSION
Definition: ape.c:32
#define MAC_FORMAT_FLAG_HAS_PEAK_LEVEL
Definition: ape.c:36
#define APE_MIN_VERSION
Definition: ape.c:31
static int ape_read_close(AVFormatContext *s)
Definition: ape.c:432
int64_t ff_ape_parse_tag(AVFormatContext *s)
Read and parse an APE tag.
Definition: apetag.c:118
uint8_t
int32_t
Main libavformat public API header.
#define AVINDEX_KEYFRAME
Definition: avformat.h:811
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:342
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:364
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:734
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:337
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:633
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:750
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:624
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
#define AV_RL16
Definition: intreadwrite.h:42
#define AV_RL32
Definition: intreadwrite.h:146
#define flags(name, subs,...)
Definition: cbs_av1.c:572
#define s(width, name)
Definition: cbs_vp9.c:257
#define fail()
Definition: checkasm.h:133
#define MKTAG(a, b, c, d)
Definition: common.h:478
#define NULL
Definition: coverity.c:32
long long int64_t
Definition: coverity.c:34
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:545
@ AV_CODEC_ID_APE
Definition: codec_id.h:456
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:99
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4509
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp, int size, int distance, int flags)
Add an index entry into a sorted list.
Definition: utils.c:2013
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2130
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AVERROR_EOF
End of file.
Definition: error.h:55
#define AVERROR(e)
Definition: error.h:43
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:215
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:210
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
int index
Definition: gxfenc.c:89
int i
Definition: input.c:407
#define AV_WL32(p, v)
Definition: intreadwrite.h:426
#define AV_WL16(p, v)
Definition: intreadwrite.h:412
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4945
int ff_alloc_extradata(AVCodecParameters *par, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0.
Definition: utils.c:3314
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
common internal API header
#define SIZE_SPECIFIER
Definition: internal.h:193
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
version
Definition: libkvazaar.c:326
uint32_t tag
Definition: movenc.c:1611
Decoder context.
Definition: apedec.c:152
uint32_t junklength
Definition: ape.c:53
uint32_t totalframes
Definition: ape.c:76
uint32_t descriptorlength
Definition: ape.c:62
uint16_t bps
Definition: ape.c:77
uint16_t formatflags
Definition: ape.c:73
int channels
Definition: apedec.c:157
uint8_t md5[16]
Definition: ape.c:69
uint32_t samplerate
Definition: ape.c:79
int fileversion
codec version, very important in decoding process
Definition: apedec.c:161
uint32_t wavtaillength
Definition: ape.c:68
uint32_t headerlength
Definition: ape.c:63
uint32_t audiodatalength_high
Definition: ape.c:67
uint16_t channels
Definition: ape.c:78
uint32_t firstframe
Definition: ape.c:54
uint32_t totalsamples
Definition: ape.c:55
int currentframe
Definition: ape.c:56
uint32_t seektablelength
Definition: ape.c:64
uint32_t audiodatalength
Definition: ape.c:66
APEFrame * frames
Definition: ape.c:57
uint32_t finalframeblocks
Definition: ape.c:75
uint32_t wavheaderlength
Definition: ape.c:65
int bps
Definition: apedec.c:159
uint16_t compressiontype
Definition: ape.c:72
int16_t padding1
Definition: ape.c:61
uint32_t blocksperframe
Definition: ape.c:74
int16_t fileversion
Definition: ape.c:60
Definition: ape.c:43
int64_t pts
Definition: ape.c:48
int64_t size
Definition: ape.c:45
int skip
Definition: ape.c:47
int nblocks
Definition: ape.c:46
int64_t pos
Definition: ape.c:44
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:102
int channels
Audio only.
Definition: codec_par.h:166
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int sample_rate
Audio only.
Definition: codec_par.h:170
Format I/O context.
Definition: avformat.h:1232
Bytestream IO Context.
Definition: avio.h:161
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
int eof_reached
true if was unable to read due to error or eof
Definition: avio.h:239
int64_t pos
Definition: avformat.h:804
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
This structure stores compressed data.
Definition: packet.h:346
int stream_index
Definition: packet.h:371
int size
Definition: packet.h:370
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:362
uint8_t * data
Definition: packet.h:369
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
Stream structure.
Definition: avformat.h:873
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:924
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:922
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base.
Definition: avformat.h:912
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1090
#define av_malloc_array(a, b)
#define ff_dlog(a,...)
#define av_freep(p)
#define av_log(a,...)
AVPacket * pkt
Definition: movenc.c:59
static int64_t pts
if(ret< 0)
Definition: vf_mcdeint.c:282
uint8_t bits
Definition: vp3data.h:141