FFmpeg  2.1.1
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 {
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 (url_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 += (size&1)-res;
85  str[res] = 0;
87  }else
88  size+= size&1;
89 
90  avio_skip(s->pb, size);
91 }
92 
93 /* Returns the number of sound data frames or negative on error */
94 static unsigned int get_aiff_header(AVFormatContext *s, int size,
95  unsigned version)
96 {
97  AVIOContext *pb = s->pb;
98  AVCodecContext *codec = s->streams[0]->codec;
99  AIFFInputContext *aiff = s->priv_data;
100  int exp;
101  uint64_t val;
102  double sample_rate;
103  unsigned int num_frames;
104 
105  if (size & 1)
106  size++;
108  codec->channels = avio_rb16(pb);
109  num_frames = avio_rb32(pb);
110  codec->bits_per_coded_sample = avio_rb16(pb);
111 
112  exp = avio_rb16(pb);
113  val = avio_rb64(pb);
114  sample_rate = ldexp(val, exp - 16383 - 63);
115  codec->sample_rate = sample_rate;
116  size -= 18;
117 
118  /* get codec id for AIFF-C */
119  if (version == AIFF_C_VERSION1) {
120  codec->codec_tag = avio_rl32(pb);
122  size -= 4;
123  }
124 
125  if (version != AIFF_C_VERSION1 || codec->codec_id == AV_CODEC_ID_PCM_S16BE) {
128  aiff->block_duration = 1;
129  } else {
130  switch (codec->codec_id) {
136  aiff->block_duration = 1;
137  break;
139  codec->block_align = 34*codec->channels;
140  break;
141  case AV_CODEC_ID_MACE3:
142  codec->block_align = 2*codec->channels;
143  break;
145  codec->bits_per_coded_sample = 5;
147  case AV_CODEC_ID_MACE6:
148  codec->block_align = 1*codec->channels;
149  break;
150  case AV_CODEC_ID_GSM:
151  codec->block_align = 33;
152  break;
153  default:
154  aiff->block_duration = 1;
155  break;
156  }
157  if (codec->block_align > 0)
159  codec->block_align);
160  }
161 
162  /* Block align needs to be computed in all cases, as the definition
163  * is specific to applications -> here we use the WAVE format definition */
164  if (!codec->block_align)
165  codec->block_align = (av_get_bits_per_sample(codec->codec_id) * codec->channels) >> 3;
166 
167  if (aiff->block_duration) {
168  codec->bit_rate = codec->sample_rate * (codec->block_align << 3) /
169  aiff->block_duration;
170  }
171 
172  /* Chunk is over */
173  if (size)
174  avio_skip(pb, size);
175 
176  return num_frames;
177 }
178 
179 static int aiff_probe(AVProbeData *p)
180 {
181  /* check file header */
182  if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
183  p->buf[2] == 'R' && p->buf[3] == 'M' &&
184  p->buf[8] == 'A' && p->buf[9] == 'I' &&
185  p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
186  return AVPROBE_SCORE_MAX;
187  else
188  return 0;
189 }
190 
191 /* aiff input */
193 {
194  int ret, size, filesize;
195  int64_t offset = 0, position;
196  uint32_t tag;
197  unsigned version = AIFF_C_VERSION1;
198  AVIOContext *pb = s->pb;
199  AVStream * st;
200  AIFFInputContext *aiff = s->priv_data;
201  ID3v2ExtraMeta *id3v2_extra_meta = NULL;
202 
203  /* check FORM header */
204  filesize = get_tag(pb, &tag);
205  if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
206  return AVERROR_INVALIDDATA;
207 
208  /* AIFF data type */
209  tag = avio_rl32(pb);
210  if (tag == MKTAG('A', 'I', 'F', 'F')) /* Got an AIFF file */
211  version = AIFF;
212  else if (tag != MKTAG('A', 'I', 'F', 'C')) /* An AIFF-C file then */
213  return AVERROR_INVALIDDATA;
214 
215  filesize -= 4;
216 
217  st = avformat_new_stream(s, NULL);
218  if (!st)
219  return AVERROR(ENOMEM);
220 
221  while (filesize > 0) {
222  /* parse different chunks */
223  size = get_tag(pb, &tag);
224  if (size < 0)
225  return size;
226 
227  filesize -= size + 8;
228 
229  switch (tag) {
230  case MKTAG('C', 'O', 'M', 'M'): /* Common chunk */
231  /* Then for the complete header info */
232  st->nb_frames = get_aiff_header(s, size, version);
233  if (st->nb_frames < 0)
234  return st->nb_frames;
235  if (offset > 0) // COMM is after SSND
236  goto got_sound;
237  break;
238  case MKTAG('I', 'D', '3', ' '):
239  position = avio_tell(pb);
240  ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
241  if (id3v2_extra_meta)
242  if ((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta)) < 0) {
243  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
244  return ret;
245  }
246  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
247  if (position + size > avio_tell(pb))
248  avio_skip(pb, position + size - avio_tell(pb));
249  break;
250  case MKTAG('F', 'V', 'E', 'R'): /* Version chunk */
251  version = avio_rb32(pb);
252  break;
253  case MKTAG('N', 'A', 'M', 'E'): /* Sample name chunk */
254  get_meta(s, "title" , size);
255  break;
256  case MKTAG('A', 'U', 'T', 'H'): /* Author chunk */
257  get_meta(s, "author" , size);
258  break;
259  case MKTAG('(', 'c', ')', ' '): /* Copyright chunk */
260  get_meta(s, "copyright", size);
261  break;
262  case MKTAG('A', 'N', 'N', 'O'): /* Annotation chunk */
263  get_meta(s, "comment" , size);
264  break;
265  case MKTAG('S', 'S', 'N', 'D'): /* Sampled sound chunk */
266  aiff->data_end = avio_tell(pb) + size;
267  offset = avio_rb32(pb); /* Offset of sound data */
268  avio_rb32(pb); /* BlockSize... don't care */
269  offset += avio_tell(pb); /* Compute absolute data offset */
270  if (st->codec->block_align && !pb->seekable) /* Assume COMM already parsed */
271  goto got_sound;
272  if (!pb->seekable) {
273  av_log(s, AV_LOG_ERROR, "file is not seekable\n");
274  return -1;
275  }
276  avio_skip(pb, size - 8);
277  break;
278  case MKTAG('w', 'a', 'v', 'e'):
279  if ((uint64_t)size > (1<<30))
280  return -1;
281  if (ff_alloc_extradata(st->codec, size))
282  return AVERROR(ENOMEM);
283  avio_read(pb, st->codec->extradata, size);
284  if (st->codec->codec_id == AV_CODEC_ID_QDM2 && size>=12*4 && !st->codec->block_align) {
285  st->codec->block_align = AV_RB32(st->codec->extradata+11*4);
286  aiff->block_duration = AV_RB32(st->codec->extradata+9*4);
287  } else if (st->codec->codec_id == AV_CODEC_ID_QCELP) {
288  char rate = 0;
289  if (size >= 25)
290  rate = st->codec->extradata[24];
291  switch (rate) {
292  case 'H': // RATE_HALF
293  st->codec->block_align = 17;
294  break;
295  case 'F': // RATE_FULL
296  default:
297  st->codec->block_align = 35;
298  }
299  aiff->block_duration = 160;
300  st->codec->bit_rate = st->codec->sample_rate * (st->codec->block_align << 3) /
301  aiff->block_duration;
302  }
303  break;
304  case MKTAG('C','H','A','N'):
305  if(ff_mov_read_chan(s, pb, st, size) < 0)
306  return AVERROR_INVALIDDATA;
307  break;
308  default: /* Jump */
309  if (size & 1) /* Always even aligned */
310  size++;
311  avio_skip(pb, size);
312  }
313  }
314 
315 got_sound:
316  if (!st->codec->block_align) {
317  av_log(s, AV_LOG_ERROR, "could not find COMM tag or invalid block_align value\n");
318  return -1;
319  }
320 
321  /* Now positioned, get the sound data start and end */
322  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
323  st->start_time = 0;
324  st->duration = st->nb_frames * aiff->block_duration;
325 
326  /* Position the stream at the first block */
327  avio_seek(pb, offset, SEEK_SET);
328 
329  return 0;
330 }
331 
332 #define MAX_SIZE 4096
333 
335  AVPacket *pkt)
336 {
337  AVStream *st = s->streams[0];
338  AIFFInputContext *aiff = s->priv_data;
339  int64_t max_size;
340  int res, size;
341 
342  /* calculate size of remaining data */
343  max_size = aiff->data_end - avio_tell(s->pb);
344  if (max_size <= 0)
345  return AVERROR_EOF;
346 
347  /* Now for that packet */
348  if (st->codec->block_align >= 17) // GSM, QCLP, IMA4
349  size = st->codec->block_align;
350  else
351  size = (MAX_SIZE / st->codec->block_align) * st->codec->block_align;
352  size = FFMIN(max_size, size);
353  res = av_get_packet(s->pb, pkt, size);
354  if (res < 0)
355  return res;
356 
357  if (size >= st->codec->block_align)
358  pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
359  /* Only one stream in an AIFF file */
360  pkt->stream_index = 0;
361  pkt->duration = (res / st->codec->block_align) * aiff->block_duration;
362  return 0;
363 }
364 
366  .name = "aiff",
367  .long_name = NULL_IF_CONFIG_SMALL("Audio IFF"),
368  .priv_data_size = sizeof(AIFFInputContext),
373  .codec_tag = (const AVCodecTag* const []){ ff_codec_aiff_tags, 0 },
374 };
const char const char void * val
Definition: avisynth_c.h:671
const char * s
Definition: avisynth_c.h:668
Bytestream IO Context.
Definition: avio.h:68
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:2556
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:478
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:3922
#define MAX_SIZE
Definition: aiffdec.c:332
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:686
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:593
#define ID3v2_DEFAULT_MAGIC
Default magic bytes for ID3v2 header: &quot;ID3&quot;.
Definition: id3v2.h:35
void av_log(void *avcl, int level, const char *fmt,...) av_printf_format(3
Send the specified message to the log if the level is less than or equal to the current av_log_level...
static int aiff_read_header(AVFormatContext *s)
Definition: aiffdec.c:192
int version
Definition: avisynth_c.h:666
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:624
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:865
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:1910
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1254
Format I/O context.
Definition: avformat.h:968
static uint8_t * res
Definition: ffhash.c:43
uint8_t
static const uint8_t offset[511][2]
Definition: vf_uspp.c:58
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:336
uint64_t avio_rb64(AVIOContext *s)
Definition: aviobuf.c:689
static int aiff_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: aiffdec.c:334
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:248
#define AIFF_C_VERSION1
Definition: aiffdec.c:34
uint32_t tag
Definition: movenc.c:961
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2563
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3348
int duration
Duration of this packet in AVStream-&gt;time_base units, 0 if unknown.
Definition: avcodec.h:1085
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:200
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:102
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: avcodec.h:4147
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:2928
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:219
void * priv_data
Format private data.
Definition: avformat.h:988
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:151
void ff_id3v2_free_extra_meta(ID3v2ExtraMeta **extra_meta)
Free memory allocated parsing special (non-text) metadata.
Definition: id3v2.c:851
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
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1069
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:117
int bit_rate
the average bitrate
Definition: avcodec.h:1204
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that&#39;s been allocated with av_malloc() and chilren.
Definition: dict.h:72
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:54
ret
Definition: avfilter.c:961
AVStream ** streams
Definition: avformat.h:1016
void * av_malloc(size_t size) av_malloc_attrib 1(1)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:73
#define FFMIN(a, b)
Definition: avcodec.h:925
static int aiff_probe(AVProbeData *p)
Definition: aiffdec.c:179
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:199
int ff_pcm_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: pcm.c:46
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
void ff_id3v2_read(AVFormatContext *s, const char *magic, ID3v2ExtraMeta **extra_meta)
Read an ID3v2 tag, including supported extra metadata.
Definition: id3v2.c:817
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:592
Stream structure.
Definition: avformat.h:667
static int get_tag(AVIOContext *pb, uint32_t *tag)
Definition: aiffdec.c:57
int block_duration
Definition: aiffdec.c:38
sample_rate
enum AVMediaType codec_type
Definition: avcodec.h:1154
enum AVCodecID codec_id
Definition: avcodec.h:1157
int sample_rate
samples per second
Definition: avcodec.h:1873
main external API structure.
Definition: avcodec.h:1146
unsigned int codec_tag
fourcc (LSB first, so &quot;ABCD&quot; -&gt; (&#39;D&#39;&lt;&lt;24) + (&#39;C&#39;&lt;&lt;16) + (&#39;B&#39;&lt;&lt;8) + &#39;A&#39;).
Definition: avcodec.h:1172
int ff_alloc_extradata(AVCodecContext *avctx, int size)
Allocate extradata with additional FF_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0...
Definition: utils.c:2690
AVIOContext * pb
I/O context.
Definition: avformat.h:1001
static int read_packet(AVFormatContext *ctx, AVPacket *pkt)
Definition: libcdio.c:114
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:62
#define MKTAG(a, b, c, d)
AVDictionary * metadata
Definition: avformat.h:1128
This structure contains the data a format has to probe a file.
Definition: avformat.h:334
int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes)
Return audio frame duration.
Definition: utils.c:2946
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:256
#define AVERROR_EOF
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:342
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:720
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:480
int url_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:280
AVInputFormat ff_aiff_demuxer
Definition: aiffdec.c:365
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:713
Main libavformat public API header.
static const AVCodecTag ff_codec_aiff_tags[]
Definition: aiff.h:33
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:722
static unsigned int get_aiff_header(AVFormatContext *s, int size, unsigned version)
Definition: aiffdec.c:94
#define AV_PKT_FLAG_CORRUPT
The packet content is corrupted.
Definition: avcodec.h:1114
unsigned bps
Definition: movenc.c:962
#define AIFF
Definition: aiffdec.c:33
#define AV_RB32(x)
Definition: intreadwrite.h:258
#define AVERROR_INVALIDDATA
as in Berlin toast format
Definition: avcodec.h:415
int channels
number of audio channels
Definition: avcodec.h:1874
#define AVERROR(e)
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:609
common header for AIFF muxer and demuxer
static AVPacket pkt
Definition: demuxing.c:52
int stream_index
Definition: avcodec.h:1065
This structure stores compressed data.
Definition: avcodec.h:1040