FFmpeg  4.0
aiffdec.c
Go to the documentation of this file.
1 /*
2  * AIFF/AIFF-C demuxer
3  * Copyright (c) 2006 Patrick Guimond
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/intreadwrite.h"
23 #include "libavutil/mathematics.h"
24 #include "libavutil/dict.h"
25 #include "avformat.h"
26 #include "internal.h"
27 #include "pcm.h"
28 #include "aiff.h"
29 #include "isom.h"
30 #include "id3v2.h"
31 #include "mov_chan.h"
32 
33 #define AIFF 0
34 #define AIFF_C_VERSION1 0xA2805140
35 
36 typedef struct AIFFInputContext {
37  int64_t data_end;
40 
42 {
43  if (bps <= 8)
44  return AV_CODEC_ID_PCM_S8;
45  if (bps <= 16)
46  return AV_CODEC_ID_PCM_S16BE;
47  if (bps <= 24)
48  return AV_CODEC_ID_PCM_S24BE;
49  if (bps <= 32)
50  return AV_CODEC_ID_PCM_S32BE;
51 
52  /* bigger than 32 isn't allowed */
53  return AV_CODEC_ID_NONE;
54 }
55 
56 /* returns the size of the found tag */
57 static int get_tag(AVIOContext *pb, uint32_t * tag)
58 {
59  int size;
60 
61  if (avio_feof(pb))
62  return AVERROR(EIO);
63 
64  *tag = avio_rl32(pb);
65  size = avio_rb32(pb);
66 
67  if (size < 0)
68  size = 0x7fffffff;
69 
70  return size;
71 }
72 
73 /* Metadata string read */
74 static void get_meta(AVFormatContext *s, const char *key, int size)
75 {
76  uint8_t *str = av_malloc(size+1);
77 
78  if (str) {
79  int res = avio_read(s->pb, str, size);
80  if (res < 0){
81  av_free(str);
82  return;
83  }
84  size -= res;
85  str[res] = 0;
87  }
88 
89  avio_skip(s->pb, size);
90 }
91 
92 /* Returns the number of sound data frames or negative on error */
94  unsigned version)
95 {
96  AVIOContext *pb = s->pb;
97  AVCodecParameters *par = s->streams[0]->codecpar;
98  AIFFInputContext *aiff = s->priv_data;
99  int exp;
100  uint64_t val;
101  int sample_rate;
102  unsigned int num_frames;
103 
104  if (size & 1)
105  size++;
107  par->channels = avio_rb16(pb);
108  num_frames = avio_rb32(pb);
109  par->bits_per_coded_sample = avio_rb16(pb);
110 
111  exp = avio_rb16(pb) - 16383 - 63;
112  val = avio_rb64(pb);
113  if (exp <-63 || exp >63) {
114  av_log(s, AV_LOG_ERROR, "exp %d is out of range\n", exp);
115  return AVERROR_INVALIDDATA;
116  }
117  if (exp >= 0)
118  sample_rate = val << exp;
119  else
120  sample_rate = (val + (1ULL<<(-exp-1))) >> -exp;
121  par->sample_rate = sample_rate;
122  size -= 18;
123 
124  /* get codec id for AIFF-C */
125  if (size < 4) {
126  version = AIFF;
127  } else if (version == AIFF_C_VERSION1) {
128  par->codec_tag = avio_rl32(pb);
130  if (par->codec_id == AV_CODEC_ID_NONE)
131  avpriv_request_sample(s, "unknown or unsupported codec tag: %s",
132  av_fourcc2str(par->codec_tag));
133  size -= 4;
134  }
135 
136  if (version != AIFF_C_VERSION1 || par->codec_id == AV_CODEC_ID_PCM_S16BE) {
139  aiff->block_duration = 1;
140  } else {
141  switch (par->codec_id) {
147  aiff->block_duration = 1;
148  break;
150  par->block_align = 34 * par->channels;
151  break;
152  case AV_CODEC_ID_MACE3:
153  par->block_align = 2 * par->channels;
154  break;
156  par->bits_per_coded_sample = 5;
159  case AV_CODEC_ID_MACE6:
161  par->block_align = 1 * par->channels;
162  break;
163  case AV_CODEC_ID_GSM:
164  par->block_align = 33;
165  break;
166  default:
167  aiff->block_duration = 1;
168  break;
169  }
170  if (par->block_align > 0)
172  par->block_align);
173  }
174 
175  /* Block align needs to be computed in all cases, as the definition
176  * is specific to applications -> here we use the WAVE format definition */
177  if (!par->block_align)
178  par->block_align = (av_get_bits_per_sample(par->codec_id) * par->channels) >> 3;
179 
180  if (aiff->block_duration) {
181  par->bit_rate = (int64_t)par->sample_rate * (par->block_align << 3) /
182  aiff->block_duration;
183  }
184 
185  /* Chunk is over */
186  if (size)
187  avio_skip(pb, size);
188 
189  return num_frames;
190 }
191 
192 static int aiff_probe(AVProbeData *p)
193 {
194  /* check file header */
195  if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
196  p->buf[2] == 'R' && p->buf[3] == 'M' &&
197  p->buf[8] == 'A' && p->buf[9] == 'I' &&
198  p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
199  return AVPROBE_SCORE_MAX;
200  else
201  return 0;
202 }
203 
204 /* aiff input */
206 {
207  int ret, size, filesize;
208  int64_t offset = 0, position;
209  uint32_t tag;
210  unsigned version = AIFF_C_VERSION1;
211  AVIOContext *pb = s->pb;
212  AVStream * st;
213  AIFFInputContext *aiff = s->priv_data;
214  ID3v2ExtraMeta *id3v2_extra_meta = NULL;
215 
216  /* check FORM header */
217  filesize = get_tag(pb, &tag);
218  if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
219  return AVERROR_INVALIDDATA;
220 
221  /* AIFF data type */
222  tag = avio_rl32(pb);
223  if (tag == MKTAG('A', 'I', 'F', 'F')) /* Got an AIFF file */
224  version = AIFF;
225  else if (tag != MKTAG('A', 'I', 'F', 'C')) /* An AIFF-C file then */
226  return AVERROR_INVALIDDATA;
227 
228  filesize -= 4;
229 
230  st = avformat_new_stream(s, NULL);
231  if (!st)
232  return AVERROR(ENOMEM);
233 
234  while (filesize > 0) {
235  /* parse different chunks */
236  size = get_tag(pb, &tag);
237 
238  if (size == AVERROR_EOF && offset > 0 && st->codecpar->block_align) {
239  av_log(s, AV_LOG_WARNING, "header parser hit EOF\n");
240  goto got_sound;
241  }
242  if (size < 0)
243  return size;
244 
245  filesize -= size + 8;
246 
247  switch (tag) {
248  case MKTAG('C', 'O', 'M', 'M'): /* Common chunk */
249  /* Then for the complete header info */
250  st->nb_frames = get_aiff_header(s, size, version);
251  if (st->nb_frames < 0)
252  return st->nb_frames;
253  if (offset > 0) // COMM is after SSND
254  goto got_sound;
255  break;
256  case MKTAG('I', 'D', '3', ' '):
257  position = avio_tell(pb);
258  ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, size);
259  if (id3v2_extra_meta)
260  if ((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta)) < 0 ||
261  (ret = ff_id3v2_parse_chapters(s, &id3v2_extra_meta)) < 0) {
262  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
263  return ret;
264  }
265  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
266  if (position + size > avio_tell(pb))
267  avio_skip(pb, position + size - avio_tell(pb));
268  break;
269  case MKTAG('F', 'V', 'E', 'R'): /* Version chunk */
270  version = avio_rb32(pb);
271  break;
272  case MKTAG('N', 'A', 'M', 'E'): /* Sample name chunk */
273  get_meta(s, "title" , size);
274  break;
275  case MKTAG('A', 'U', 'T', 'H'): /* Author chunk */
276  get_meta(s, "author" , size);
277  break;
278  case MKTAG('(', 'c', ')', ' '): /* Copyright chunk */
279  get_meta(s, "copyright", size);
280  break;
281  case MKTAG('A', 'N', 'N', 'O'): /* Annotation chunk */
282  get_meta(s, "comment" , size);
283  break;
284  case MKTAG('S', 'S', 'N', 'D'): /* Sampled sound chunk */
285  aiff->data_end = avio_tell(pb) + size;
286  offset = avio_rb32(pb); /* Offset of sound data */
287  avio_rb32(pb); /* BlockSize... don't care */
288  offset += avio_tell(pb); /* Compute absolute data offset */
289  if (st->codecpar->block_align && !(pb->seekable & AVIO_SEEKABLE_NORMAL)) /* Assume COMM already parsed */
290  goto got_sound;
291  if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
292  av_log(s, AV_LOG_ERROR, "file is not seekable\n");
293  return -1;
294  }
295  avio_skip(pb, size - 8);
296  break;
297  case MKTAG('w', 'a', 'v', 'e'):
298  if ((uint64_t)size > (1<<30))
299  return -1;
300  if (ff_get_extradata(s, st->codecpar, pb, size) < 0)
301  return AVERROR(ENOMEM);
303  && size>=12*4 && !st->codecpar->block_align) {
304  st->codecpar->block_align = AV_RB32(st->codecpar->extradata+11*4);
305  aiff->block_duration = AV_RB32(st->codecpar->extradata+9*4);
306  } else if (st->codecpar->codec_id == AV_CODEC_ID_QCELP) {
307  char rate = 0;
308  if (size >= 25)
309  rate = st->codecpar->extradata[24];
310  switch (rate) {
311  case 'H': // RATE_HALF
312  st->codecpar->block_align = 17;
313  break;
314  case 'F': // RATE_FULL
315  default:
316  st->codecpar->block_align = 35;
317  }
318  aiff->block_duration = 160;
319  st->codecpar->bit_rate = (int64_t)st->codecpar->sample_rate * (st->codecpar->block_align << 3) /
320  aiff->block_duration;
321  }
322  break;
323  case MKTAG('C','H','A','N'):
324  if(ff_mov_read_chan(s, pb, st, size) < 0)
325  return AVERROR_INVALIDDATA;
326  break;
327  case MKTAG('A','P','C','M'): /* XA ADPCM compressed sound chunk */
329  aiff->data_end = avio_tell(pb) + size;
330  offset = avio_tell(pb) + 8;
331  /* This field is unknown and its data seems to be irrelevant */
332  avio_rb32(pb);
333  st->codecpar->block_align = avio_rb32(pb);
334 
335  goto got_sound;
336  break;
337  case 0:
338  if (offset > 0 && st->codecpar->block_align) // COMM && SSND
339  goto got_sound;
340  default: /* Jump */
341  avio_skip(pb, size);
342  }
343 
344  /* Skip required padding byte for odd-sized chunks. */
345  if (size & 1) {
346  filesize--;
347  avio_skip(pb, 1);
348  }
349  }
350 
351 got_sound:
352  if (!st->codecpar->block_align && st->codecpar->codec_id == AV_CODEC_ID_QCELP) {
353  av_log(s, AV_LOG_WARNING, "qcelp without wave chunk, assuming full rate\n");
354  st->codecpar->block_align = 35;
355  } else if (!st->codecpar->block_align) {
356  av_log(s, AV_LOG_ERROR, "could not find COMM tag or invalid block_align value\n");
357  return -1;
358  }
359 
360  /* Now positioned, get the sound data start and end */
361  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
362  st->start_time = 0;
363  st->duration = st->nb_frames * aiff->block_duration;
364 
365  /* Position the stream at the first block */
366  avio_seek(pb, offset, SEEK_SET);
367 
368  return 0;
369 }
370 
371 #define MAX_SIZE 4096
372 
374  AVPacket *pkt)
375 {
376  AVStream *st = s->streams[0];
377  AIFFInputContext *aiff = s->priv_data;
378  int64_t max_size;
379  int res, size;
380 
381  /* calculate size of remaining data */
382  max_size = aiff->data_end - avio_tell(s->pb);
383  if (max_size <= 0)
384  return AVERROR_EOF;
385 
386  if (!st->codecpar->block_align) {
387  av_log(s, AV_LOG_ERROR, "block_align not set\n");
388  return AVERROR_INVALIDDATA;
389  }
390 
391  /* Now for that packet */
392  switch (st->codecpar->codec_id) {
394  case AV_CODEC_ID_GSM:
395  case AV_CODEC_ID_QDM2:
396  case AV_CODEC_ID_QCELP:
397  size = st->codecpar->block_align;
398  break;
399  default:
401  }
402  size = FFMIN(max_size, size);
403  res = av_get_packet(s->pb, pkt, size);
404  if (res < 0)
405  return res;
406 
407  if (size >= st->codecpar->block_align)
408  pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
409  /* Only one stream in an AIFF file */
410  pkt->stream_index = 0;
411  pkt->duration = (res / st->codecpar->block_align) * aiff->block_duration;
412  return 0;
413 }
414 
416  .name = "aiff",
417  .long_name = NULL_IF_CONFIG_SMALL("Audio IFF"),
418  .priv_data_size = sizeof(AIFFInputContext),
423  .codec_tag = (const AVCodecTag* const []){ ff_codec_aiff_tags, 0 },
424 };
#define NULL
Definition: coverity.c:32
const char const char void * val
Definition: avisynth_c.h:771
static int get_aiff_header(AVFormatContext *s, int size, unsigned version)
Definition: aiffdec.c:93
const char * s
Definition: avisynth_c.h:768
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int size
int64_t data_end
Definition: aiffdec.c:37
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3108
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
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:4811
#define MAX_SIZE
Definition: aiffdec.c:371
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3884
#define ID3v2_DEFAULT_MAGIC
Default magic bytes for ID3v2 header: "ID3".
Definition: id3v2.h:35
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:331
const char * key
static int aiff_read_header(AVFormatContext *s)
Definition: aiffdec.c:205
int version
Definition: avisynth_c.h:766
static AVPacket pkt
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:786
int ff_id3v2_parse_apic(AVFormatContext *s, ID3v2ExtraMeta **extra_meta)
Create a stream for each APIC (attached picture) extracted from the ID3v2 header. ...
Definition: id3v2.c:1140
This struct describes the properties of an encoded stream.
Definition: avcodec.h:3876
Format I/O context.
Definition: avformat.h:1342
Public dictionary API.
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
uint8_t
#define av_malloc(s)
int ff_id3v2_parse_chapters(AVFormatContext *s, ID3v2ExtraMeta **extra_meta)
Create chapters for all CHAP tags found in the ID3v2 header.
Definition: id3v2.c:1180
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:801
#define AV_RB32
Definition: intreadwrite.h:130
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1448
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4441
static int aiff_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: aiffdec.c:373
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1410
#define AIFF_C_VERSION1
Definition: aiffdec.c:34
uint32_t tag
Definition: movenc.c:1455
#define AVERROR_EOF
End of file.
Definition: error.h:55
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:310
uint64_t avio_rb64(AVIOContext *s)
Definition: aviobuf.c:922
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:648
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3913
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:215
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:1495
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1580
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:770
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
#define av_fourcc2str(fourcc)
Definition: avutil.h:348
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3880
void ff_id3v2_free_extra_meta(ID3v2ExtraMeta **extra_meta)
Free memory allocated parsing special (non-text) metadata.
Definition: id3v2.c:1124
static void get_meta(AVFormatContext *s, const char *key, int size)
Definition: aiffdec.c:74
static enum AVCodecID aiff_codec_get_id(int bps)
Definition: aiffdec.c:41
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes)
This function is the same as av_get_audio_frame_duration(), except it works with AVCodecParameters in...
Definition: utils.c:1709
int8_t exp
Definition: eval.c:72
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1436
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:450
int block_align
Audio only.
Definition: avcodec.h:4001
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
#define FFMIN(a, b)
Definition: common.h:96
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that&#39;s been allocated with av_malloc() or another memory allocation functio...
Definition: dict.h:76
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
static int aiff_probe(AVProbeData *p)
Definition: aiffdec.c:192
int ff_pcm_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: pcm.c:52
int ff_mov_read_chan(AVFormatContext *s, AVIOContext *pb, AVStream *st, int64_t size)
Read &#39;chan&#39; tag from the input stream.
Definition: mov_chan.c:547
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:530
Stream structure.
Definition: avformat.h:873
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
static int get_tag(AVIOContext *pb, uint32_t *tag)
Definition: aiffdec.c:57
int block_duration
Definition: aiffdec.c:38
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
sample_rate
AVIOContext * pb
I/O context.
Definition: avformat.h:1384
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:70
This structure contains the data a format has to probe a file.
Definition: avformat.h:448
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:922
int sample_rate
Audio only.
Definition: avcodec.h:3994
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:460
Main libavformat public API header.
AVInputFormat ff_aiff_demuxer
Definition: aiffdec.c:415
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:912
int ff_get_extradata(AVFormatContext *s, AVCodecParameters *par, AVIOContext *pb, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0 and f...
Definition: utils.c:3289
static const AVCodecTag ff_codec_aiff_tags[]
Definition: aiff.h:33
void ff_id3v2_read(AVFormatContext *s, const char *magic, ID3v2ExtraMeta **extra_meta, unsigned int max_search_size)
Read an ID3v2 tag, including supported extra metadata.
Definition: id3v2.c:1118
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:924
#define AV_PKT_FLAG_CORRUPT
The packet content is corrupted.
Definition: avcodec.h:1463
unsigned bps
Definition: movenc.c:1456
#define AIFF
Definition: aiffdec.c:33
#define av_free(p)
as in Berlin toast format
Definition: avcodec.h:569
void * priv_data
Format private data.
Definition: avformat.h:1370
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:3926
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3898
int channels
Audio only.
Definition: avcodec.h:3990
common header for AIFF muxer and demuxer
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:647
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1020
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:358
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3888
int stream_index
Definition: avcodec.h:1432
#define MKTAG(a, b, c, d)
Definition: common.h:366
This structure stores compressed data.
Definition: avcodec.h:1407