FFmpeg
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 {
44  int64_t pos;
45  int nblocks;
46  int size;
47  int skip;
48  int64_t pts;
49 } APEFrame;
50 
51 typedef struct APEContext {
52  /* Derived fields */
53  uint32_t junklength;
54  uint32_t firstframe;
55  uint32_t totalsamples;
56  int currentframe;
57  APEFrame *frames;
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;
67  uint32_t audiodatalength_high;
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 
81  /* Seektable */
82  uint32_t *seektable;
83  uint8_t *bittable;
84 } APEContext;
85 
86 static int ape_probe(const AVProbeData * p)
87 {
88  int version = AV_RL16(p->buf+4);
89  if (AV_RL32(p->buf) != MKTAG('M', 'A', 'C', ' '))
90  return 0;
91 
92  if (version < APE_MIN_VERSION || version > APE_MAX_VERSION)
93  return AVPROBE_SCORE_MAX/4;
94 
95  return AVPROBE_SCORE_MAX;
96 }
97 
98 static void ape_dumpinfo(AVFormatContext * s, APEContext * ape_ctx)
99 {
100 #ifdef DEBUG
101  int i;
102 
103  av_log(s, AV_LOG_DEBUG, "Descriptor Block:\n\n");
104  av_log(s, AV_LOG_DEBUG, "fileversion = %"PRId16"\n", ape_ctx->fileversion);
105  av_log(s, AV_LOG_DEBUG, "descriptorlength = %"PRIu32"\n", ape_ctx->descriptorlength);
106  av_log(s, AV_LOG_DEBUG, "headerlength = %"PRIu32"\n", ape_ctx->headerlength);
107  av_log(s, AV_LOG_DEBUG, "seektablelength = %"PRIu32"\n", ape_ctx->seektablelength);
108  av_log(s, AV_LOG_DEBUG, "wavheaderlength = %"PRIu32"\n", ape_ctx->wavheaderlength);
109  av_log(s, AV_LOG_DEBUG, "audiodatalength = %"PRIu32"\n", ape_ctx->audiodatalength);
110  av_log(s, AV_LOG_DEBUG, "audiodatalength_high = %"PRIu32"\n", ape_ctx->audiodatalength_high);
111  av_log(s, AV_LOG_DEBUG, "wavtaillength = %"PRIu32"\n", ape_ctx->wavtaillength);
112  av_log(s, AV_LOG_DEBUG, "md5 = ");
113  for (i = 0; i < 16; i++)
114  av_log(s, AV_LOG_DEBUG, "%02x", ape_ctx->md5[i]);
115  av_log(s, AV_LOG_DEBUG, "\n");
116 
117  av_log(s, AV_LOG_DEBUG, "\nHeader Block:\n\n");
118 
119  av_log(s, AV_LOG_DEBUG, "compressiontype = %"PRIu16"\n", ape_ctx->compressiontype);
120  av_log(s, AV_LOG_DEBUG, "formatflags = %"PRIu16"\n", ape_ctx->formatflags);
121  av_log(s, AV_LOG_DEBUG, "blocksperframe = %"PRIu32"\n", ape_ctx->blocksperframe);
122  av_log(s, AV_LOG_DEBUG, "finalframeblocks = %"PRIu32"\n", ape_ctx->finalframeblocks);
123  av_log(s, AV_LOG_DEBUG, "totalframes = %"PRIu32"\n", ape_ctx->totalframes);
124  av_log(s, AV_LOG_DEBUG, "bps = %"PRIu16"\n", ape_ctx->bps);
125  av_log(s, AV_LOG_DEBUG, "channels = %"PRIu16"\n", ape_ctx->channels);
126  av_log(s, AV_LOG_DEBUG, "samplerate = %"PRIu32"\n", ape_ctx->samplerate);
127 
128  av_log(s, AV_LOG_DEBUG, "\nSeektable\n\n");
129  if ((ape_ctx->seektablelength / sizeof(uint32_t)) != ape_ctx->totalframes) {
130  av_log(s, AV_LOG_DEBUG, "No seektable\n");
131  } else {
132  for (i = 0; i < ape_ctx->seektablelength / sizeof(uint32_t); i++) {
133  if (i < ape_ctx->totalframes - 1) {
134  av_log(s, AV_LOG_DEBUG, "%8d %"PRIu32" (%"PRIu32" bytes)",
135  i, ape_ctx->seektable[i],
136  ape_ctx->seektable[i + 1] - ape_ctx->seektable[i]);
137  if (ape_ctx->bittable)
138  av_log(s, AV_LOG_DEBUG, " + %2d bits\n",
139  ape_ctx->bittable[i]);
140  av_log(s, AV_LOG_DEBUG, "\n");
141  } else {
142  av_log(s, AV_LOG_DEBUG, "%8d %"PRIu32"\n", i, ape_ctx->seektable[i]);
143  }
144  }
145  }
146 
147  av_log(s, AV_LOG_DEBUG, "\nFrames\n\n");
148  for (i = 0; i < ape_ctx->totalframes; i++)
149  av_log(s, AV_LOG_DEBUG, "%8d %8"PRId64" %8d (%d samples)\n", i,
150  ape_ctx->frames[i].pos, ape_ctx->frames[i].size,
151  ape_ctx->frames[i].nblocks);
152 
153  av_log(s, AV_LOG_DEBUG, "\nCalculated information:\n\n");
154  av_log(s, AV_LOG_DEBUG, "junklength = %"PRIu32"\n", ape_ctx->junklength);
155  av_log(s, AV_LOG_DEBUG, "firstframe = %"PRIu32"\n", ape_ctx->firstframe);
156  av_log(s, AV_LOG_DEBUG, "totalsamples = %"PRIu32"\n", ape_ctx->totalsamples);
157 #endif
158 }
159 
160 static int ape_read_header(AVFormatContext * s)
161 {
162  AVIOContext *pb = s->pb;
163  APEContext *ape = s->priv_data;
164  AVStream *st;
165  uint32_t tag;
166  int i;
167  int total_blocks, final_size = 0;
168  int64_t pts, file_size;
169 
170  /* Skip any leading junk such as id3v2 tags */
171  ape->junklength = avio_tell(pb);
172 
173  tag = avio_rl32(pb);
174  if (tag != MKTAG('M', 'A', 'C', ' '))
175  return AVERROR_INVALIDDATA;
176 
177  ape->fileversion = avio_rl16(pb);
178 
179  if (ape->fileversion < APE_MIN_VERSION || ape->fileversion > APE_MAX_VERSION) {
180  av_log(s, AV_LOG_ERROR, "Unsupported file version - %d.%02d\n",
181  ape->fileversion / 1000, (ape->fileversion % 1000) / 10);
182  return AVERROR_PATCHWELCOME;
183  }
184 
185  if (ape->fileversion >= 3980) {
186  ape->padding1 = avio_rl16(pb);
187  ape->descriptorlength = avio_rl32(pb);
188  ape->headerlength = avio_rl32(pb);
189  ape->seektablelength = avio_rl32(pb);
190  ape->wavheaderlength = avio_rl32(pb);
191  ape->audiodatalength = avio_rl32(pb);
192  ape->audiodatalength_high = avio_rl32(pb);
193  ape->wavtaillength = avio_rl32(pb);
194  avio_read(pb, ape->md5, 16);
195 
196  /* Skip any unknown bytes at the end of the descriptor.
197  This is for future compatibility */
198  if (ape->descriptorlength > 52)
199  avio_skip(pb, ape->descriptorlength - 52);
200 
201  /* Read header data */
202  ape->compressiontype = avio_rl16(pb);
203  ape->formatflags = avio_rl16(pb);
204  ape->blocksperframe = avio_rl32(pb);
205  ape->finalframeblocks = avio_rl32(pb);
206  ape->totalframes = avio_rl32(pb);
207  ape->bps = avio_rl16(pb);
208  ape->channels = avio_rl16(pb);
209  ape->samplerate = avio_rl32(pb);
210  } else {
211  ape->descriptorlength = 0;
212  ape->headerlength = 32;
213 
214  ape->compressiontype = avio_rl16(pb);
215  ape->formatflags = avio_rl16(pb);
216  ape->channels = avio_rl16(pb);
217  ape->samplerate = avio_rl32(pb);
218  ape->wavheaderlength = avio_rl32(pb);
219  ape->wavtaillength = avio_rl32(pb);
220  ape->totalframes = avio_rl32(pb);
221  ape->finalframeblocks = avio_rl32(pb);
222 
223  if (ape->formatflags & MAC_FORMAT_FLAG_HAS_PEAK_LEVEL) {
224  avio_skip(pb, 4); /* Skip the peak level */
225  ape->headerlength += 4;
226  }
227 
228  if (ape->formatflags & MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS) {
229  ape->seektablelength = avio_rl32(pb);
230  ape->headerlength += 4;
231  ape->seektablelength *= sizeof(int32_t);
232  } else
233  ape->seektablelength = ape->totalframes * sizeof(int32_t);
234 
235  if (ape->formatflags & MAC_FORMAT_FLAG_8_BIT)
236  ape->bps = 8;
237  else if (ape->formatflags & MAC_FORMAT_FLAG_24_BIT)
238  ape->bps = 24;
239  else
240  ape->bps = 16;
241 
242  if (ape->fileversion >= 3950)
243  ape->blocksperframe = 73728 * 4;
244  else if (ape->fileversion >= 3900 || (ape->fileversion >= 3800 && ape->compressiontype >= 4000))
245  ape->blocksperframe = 73728;
246  else
247  ape->blocksperframe = 9216;
248 
249  /* Skip any stored wav header */
250  if (!(ape->formatflags & MAC_FORMAT_FLAG_CREATE_WAV_HEADER))
251  avio_skip(pb, ape->wavheaderlength);
252  }
253 
254  if(!ape->totalframes){
255  av_log(s, AV_LOG_ERROR, "No frames in the file!\n");
256  return AVERROR(EINVAL);
257  }
258  if(ape->totalframes > UINT_MAX / sizeof(APEFrame)){
259  av_log(s, AV_LOG_ERROR, "Too many frames: %"PRIu32"\n",
260  ape->totalframes);
261  return AVERROR_INVALIDDATA;
262  }
263  if (ape->seektablelength / sizeof(*ape->seektable) < ape->totalframes) {
264  av_log(s, AV_LOG_ERROR,
265  "Number of seek entries is less than number of frames: %"SIZE_SPECIFIER" vs. %"PRIu32"\n",
266  ape->seektablelength / sizeof(*ape->seektable), ape->totalframes);
267  return AVERROR_INVALIDDATA;
268  }
269  ape->frames = av_malloc_array(ape->totalframes, sizeof(APEFrame));
270  if(!ape->frames)
271  return AVERROR(ENOMEM);
272  ape->firstframe = ape->junklength + ape->descriptorlength + ape->headerlength + ape->seektablelength + ape->wavheaderlength;
273  if (ape->fileversion < 3810)
274  ape->firstframe += ape->totalframes;
275  ape->currentframe = 0;
276 
277 
278  ape->totalsamples = ape->finalframeblocks;
279  if (ape->totalframes > 1)
280  ape->totalsamples += ape->blocksperframe * (ape->totalframes - 1);
281 
282  if (ape->seektablelength > 0) {
283  ape->seektable = av_mallocz(ape->seektablelength);
284  if (!ape->seektable)
285  return AVERROR(ENOMEM);
286  for (i = 0; i < ape->seektablelength / sizeof(uint32_t) && !pb->eof_reached; i++)
287  ape->seektable[i] = avio_rl32(pb);
288  if (ape->fileversion < 3810) {
289  ape->bittable = av_mallocz(ape->totalframes);
290  if (!ape->bittable)
291  return AVERROR(ENOMEM);
292  for (i = 0; i < ape->totalframes && !pb->eof_reached; i++)
293  ape->bittable[i] = avio_r8(pb);
294  }
295  if (pb->eof_reached)
296  av_log(s, AV_LOG_WARNING, "File truncated\n");
297  }
298 
299  ape->frames[0].pos = ape->firstframe;
300  ape->frames[0].nblocks = ape->blocksperframe;
301  ape->frames[0].skip = 0;
302  for (i = 1; i < ape->totalframes; i++) {
303  ape->frames[i].pos = ape->seektable[i] + ape->junklength;
304  ape->frames[i].nblocks = ape->blocksperframe;
305  ape->frames[i - 1].size = ape->frames[i].pos - ape->frames[i - 1].pos;
306  ape->frames[i].skip = (ape->frames[i].pos - ape->frames[0].pos) & 3;
307  }
308  ape->frames[ape->totalframes - 1].nblocks = ape->finalframeblocks;
309  /* calculate final packet size from total file size, if available */
310  file_size = avio_size(pb);
311  if (file_size > 0) {
312  final_size = file_size - ape->frames[ape->totalframes - 1].pos -
313  ape->wavtaillength;
314  final_size -= final_size & 3;
315  }
316  if (file_size <= 0 || final_size <= 0)
317  final_size = ape->finalframeblocks * 8;
318  ape->frames[ape->totalframes - 1].size = final_size;
319 
320  for (i = 0; i < ape->totalframes; i++) {
321  if(ape->frames[i].skip){
322  ape->frames[i].pos -= ape->frames[i].skip;
323  ape->frames[i].size += ape->frames[i].skip;
324  }
325  ape->frames[i].size = (ape->frames[i].size + 3) & ~3;
326  }
327  if (ape->fileversion < 3810) {
328  for (i = 0; i < ape->totalframes; i++) {
329  if (i < ape->totalframes - 1 && ape->bittable[i + 1])
330  ape->frames[i].size += 4;
331  ape->frames[i].skip <<= 3;
332  ape->frames[i].skip += ape->bittable[i];
333  }
334  }
335 
336  ape_dumpinfo(s, ape);
337 
338  av_log(s, AV_LOG_VERBOSE, "Decoding file - v%d.%02d, compression level %"PRIu16"\n",
339  ape->fileversion / 1000, (ape->fileversion % 1000) / 10,
340  ape->compressiontype);
341 
342  /* now we are ready: build format streams */
343  st = avformat_new_stream(s, NULL);
344  if (!st)
345  return AVERROR(ENOMEM);
346 
347  total_blocks = (ape->totalframes == 0) ? 0 : ((ape->totalframes - 1) * ape->blocksperframe) + ape->finalframeblocks;
348 
349  st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
350  st->codecpar->codec_id = AV_CODEC_ID_APE;
351  st->codecpar->codec_tag = MKTAG('A', 'P', 'E', ' ');
352  st->codecpar->channels = ape->channels;
353  st->codecpar->sample_rate = ape->samplerate;
354  st->codecpar->bits_per_coded_sample = ape->bps;
355 
356  st->nb_frames = ape->totalframes;
357  st->start_time = 0;
358  st->duration = total_blocks;
359  avpriv_set_pts_info(st, 64, 1, ape->samplerate);
360 
361  if (ff_alloc_extradata(st->codecpar, APE_EXTRADATA_SIZE))
362  return AVERROR(ENOMEM);
363  AV_WL16(st->codecpar->extradata + 0, ape->fileversion);
364  AV_WL16(st->codecpar->extradata + 2, ape->compressiontype);
365  AV_WL16(st->codecpar->extradata + 4, ape->formatflags);
366 
367  pts = 0;
368  for (i = 0; i < ape->totalframes; i++) {
369  ape->frames[i].pts = pts;
370  av_add_index_entry(st, ape->frames[i].pos, ape->frames[i].pts, 0, 0, AVINDEX_KEYFRAME);
371  pts += ape->blocksperframe;
372  }
373 
374  /* try to read APE tags */
375  if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
376  ff_ape_parse_tag(s);
377  avio_seek(pb, 0, SEEK_SET);
378  }
379 
380  return 0;
381 }
382 
383 static int ape_read_packet(AVFormatContext * s, AVPacket * pkt)
384 {
385  int ret;
386  int nblocks;
387  APEContext *ape = s->priv_data;
388  uint32_t extra_size = 8;
389 
390  if (avio_feof(s->pb))
391  return AVERROR_EOF;
392  if (ape->currentframe >= ape->totalframes)
393  return AVERROR_EOF;
394 
395  if (avio_seek(s->pb, ape->frames[ape->currentframe].pos, SEEK_SET) < 0)
396  return AVERROR(EIO);
397 
398  /* Calculate how many blocks there are in this frame */
399  if (ape->currentframe == (ape->totalframes - 1))
400  nblocks = ape->finalframeblocks;
401  else
402  nblocks = ape->blocksperframe;
403 
404  if (ape->frames[ape->currentframe].size <= 0 ||
405  ape->frames[ape->currentframe].size > INT_MAX - extra_size) {
406  av_log(s, AV_LOG_ERROR, "invalid packet size: %d\n",
407  ape->frames[ape->currentframe].size);
408  ape->currentframe++;
409  return AVERROR(EIO);
410  }
411 
412  if (av_new_packet(pkt, ape->frames[ape->currentframe].size + extra_size) < 0)
413  return AVERROR(ENOMEM);
414 
415  AV_WL32(pkt->data , nblocks);
416  AV_WL32(pkt->data + 4, ape->frames[ape->currentframe].skip);
417  ret = avio_read(s->pb, pkt->data + extra_size, ape->frames[ape->currentframe].size);
418  if (ret < 0) {
419  av_packet_unref(pkt);
420  return ret;
421  }
422 
423  pkt->pts = ape->frames[ape->currentframe].pts;
424  pkt->stream_index = 0;
425 
426  /* note: we need to modify the packet size here to handle the last
427  packet */
428  pkt->size = ret + extra_size;
429 
430  ape->currentframe++;
431 
432  return 0;
433 }
434 
435 static int ape_read_close(AVFormatContext * s)
436 {
437  APEContext *ape = s->priv_data;
438 
439  av_freep(&ape->frames);
440  av_freep(&ape->seektable);
441  av_freep(&ape->bittable);
442  return 0;
443 }
444 
445 static int ape_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
446 {
447  AVStream *st = s->streams[stream_index];
448  APEContext *ape = s->priv_data;
449  int index = av_index_search_timestamp(st, timestamp, flags);
450 
451  if (index < 0)
452  return -1;
453 
454  if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0)
455  return -1;
456  ape->currentframe = index;
457  return 0;
458 }
459 
460 AVInputFormat ff_ape_demuxer = {
461  .name = "ape",
462  .long_name = NULL_IF_CONFIG_SMALL("Monkey's Audio"),
463  .priv_data_size = sizeof(APEContext),
464  .read_probe = ape_probe,
465  .read_header = ape_read_header,
466  .read_packet = ape_read_packet,
467  .read_close = ape_read_close,
468  .read_seek = ape_read_seek,
469  .extensions = "ape,apl,mac",
470 };
AVStream::index_entries
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1099
MAC_FORMAT_FLAG_CREATE_WAV_HEADER
#define MAC_FORMAT_FLAG_CREATE_WAV_HEADER
Definition: ape.c:39
av_packet_unref
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:599
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3971
MAC_FORMAT_FLAG_HAS_PEAK_LEVEL
#define MAC_FORMAT_FLAG_HAS_PEAK_LEVEL
Definition: ape.c:36
APEContext::wavheaderlength
uint32_t wavheaderlength
Definition: ape.c:65
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4480
AV_CODEC_ID_APE
@ AV_CODEC_ID_APE
Definition: avcodec.h:596
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3953
AV_WL32
#define AV_WL32(p, v)
Definition: intreadwrite.h:426
APEContext::finalframeblocks
uint32_t finalframeblocks
Definition: ape.c:75
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:55
MKTAG
#define MKTAG(a, b, c, d)
Definition: common.h:366
APEFrame::skip
int skip
Definition: ape.c:47
APEContext::totalsamples
uint32_t totalsamples
Definition: ape.c:55
apetag.h
APEFrame::size
int size
Definition: ape.c:46
AVPacket::data
uint8_t * data
Definition: avcodec.h:1477
APEContext::fileversion
int16_t fileversion
Definition: ape.c:60
AV_LOG_VERBOSE
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
MAC_FORMAT_FLAG_8_BIT
#define MAC_FORMAT_FLAG_8_BIT
Definition: ape.c:34
ape_probe
static int ape_probe(const AVProbeData *p)
Definition: ape.c:86
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3961
avio_size
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:336
ff_ape_parse_tag
int64_t ff_ape_parse_tag(AVFormatContext *s)
Read and parse an APE tag.
Definition: apetag.c:118
APEContext::audiodatalength
uint32_t audiodatalength
Definition: ape.c:66
AVINDEX_KEYFRAME
#define AVINDEX_KEYFRAME
Definition: avformat.h:808
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
APEContext::firstframe
uint32_t firstframe
Definition: ape.c:54
AVCodecParameters::channels
int channels
Audio only.
Definition: avcodec.h:4063
APEContext::fileversion
int fileversion
codec version, very important in decoding process
Definition: apedec.c:145
read_seek
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
av_add_index_entry
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:2056
read_close
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
pts
static int64_t pts
Definition: transcode_aac.c:647
APEContext::blocksperframe
uint32_t blocksperframe
Definition: ape.c:74
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:919
APEContext::compressiontype
uint16_t compressiontype
Definition: ape.c:72
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:753
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
AVInputFormat
Definition: avformat.h:640
APEContext::audiodatalength_high
uint32_t audiodatalength_high
Definition: ape.c:67
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
av_new_packet
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:86
APEContext::junklength
uint32_t junklength
Definition: ape.c:53
ape_dumpinfo
static void ape_dumpinfo(AVFormatContext *s, APEContext *ape_ctx)
Definition: ape.c:98
APEContext::currentframe
int currentframe
Definition: ape.c:56
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
AV_RL16
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:90
MAC_FORMAT_FLAG_24_BIT
#define MAC_FORMAT_FLAG_24_BIT
Definition: ape.c:37
version
int version
Definition: avisynth_c.h:858
int32_t
int32_t
Definition: audio_convert.c:194
if
if(ret)
Definition: filter_design.txt:179
AVFormatContext
Format I/O context.
Definition: avformat.h:1342
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1017
APEContext::formatflags
uint16_t formatflags
Definition: ape.c:73
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:530
NULL
#define NULL
Definition: coverity.c:32
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
read_probe
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
APEContext::md5
uint8_t md5[16]
Definition: ape.c:69
APEContext
Decoder context.
Definition: apedec.c:136
APEContext::wavtaillength
uint32_t wavtaillength
Definition: ape.c:68
APEFrame::nblocks
int nblocks
Definition: ape.c:45
index
int index
Definition: gxfenc.c:89
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: avcodec.h:4067
AVStream::nb_frames
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:921
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:769
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
AVPacket::size
int size
Definition: avcodec.h:1478
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:188
AVIOContext::seekable
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
avpriv_set_pts_info
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:4910
APE_EXTRADATA_SIZE
#define APE_EXTRADATA_SIZE
Definition: ape.c:41
AV_WL16
#define AV_WL16(p, v)
Definition: intreadwrite.h:412
APEContext::channels
uint16_t channels
Definition: ape.c:78
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:638
ape_read_header
static int ape_read_header(AVFormatContext *s)
Definition: ape.c:160
APE_MIN_VERSION
#define APE_MIN_VERSION
Definition: ape.c:31
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1470
APEContext::totalframes
uint32_t totalframes
Definition: ape.c:76
av_malloc_array
#define av_malloc_array(a, b)
Definition: tableprint_vlc.h:32
APEContext::bps
uint16_t bps
Definition: ape.c:77
uint8_t
uint8_t
Definition: audio_convert.c:194
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:236
APEContext::bittable
uint8_t * bittable
Definition: ape.c:83
APEFrame
Definition: ape.c:43
ape_read_packet
static int ape_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: ape.c:383
tag
uint32_t tag
Definition: movenc.c:1496
ret
ret
Definition: filter_design.txt:187
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVStream
Stream structure.
Definition: avformat.h:870
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
APEContext::samplerate
uint32_t samplerate
Definition: ape.c:79
ff_ape_demuxer
AVInputFormat ff_ape_demuxer
Definition: ape.c:460
APE_MAX_VERSION
#define APE_MAX_VERSION
Definition: ape.c:32
avformat.h
ape_read_close
static int ape_read_close(AVFormatContext *s)
Definition: ape.c:435
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:88
SIZE_SPECIFIER
#define SIZE_SPECIFIER
Definition: internal.h:264
pkt
static AVPacket pkt
Definition: demuxing_decoding.c:54
APEFrame::pts
int64_t pts
Definition: ape.c:48
AVIO_SEEKABLE_NORMAL
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
APEContext::channels
int channels
Definition: apedec.c:141
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:647
AVIndexEntry::pos
int64_t pos
Definition: avformat.h:801
AVIOContext::eof_reached
int eof_reached
true if was unable to read due to error or eof
Definition: avio.h:239
AVPacket::stream_index
int stream_index
Definition: avcodec.h:1479
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:331
APEContext::headerlength
uint32_t headerlength
Definition: ape.c:63
MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS
#define MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS
Definition: ape.c:38
APEFrame::pos
int64_t pos
Definition: ape.c:44
AVCodecParameters::bits_per_coded_sample
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:3999
APEContext::bps
int bps
Definition: apedec.c:143
ape_read_seek
static int ape_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: ape.c:445
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3957
AVPacket
This structure stores compressed data.
Definition: avcodec.h:1454
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:565
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
AVStream::start_time
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base.
Definition: avformat.h:909
APEContext::seektable
uint32_t * seektable
Definition: ape.c:82
APEContext::padding1
int16_t padding1
Definition: ape.c:61
APEContext::seektablelength
uint32_t seektablelength
Definition: ape.c:64
APEContext::descriptorlength
uint32_t descriptorlength
Definition: ape.c:62
av_index_search_timestamp
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2167
ff_alloc_extradata
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:3309
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:358
APEContext::frames
APEFrame * frames
Definition: ape.c:57
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