VirtualBox

source: vbox/trunk/src/libs/ffmpeg-20060710/libavformat/aiff.c@ 11551

Last change on this file since 11551 was 5776, checked in by vboxsync, 17 years ago

ffmpeg: exported to OSE
File size: 12.6 KB
Line 
1/*
2 * AIFF/AIFF-C encoder and decoder
3 * Copyright (c) 2006 Patrick Guimond
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19#include "avformat.h"
20#include "allformats.h"
21#include "avi.h"
22#include "intfloat_readwrite.h"
23
24const CodecTag codec_aiff_tags[] = {
25 { CODEC_ID_PCM_S16BE, MKTAG('N','O','N','E') },
26 { CODEC_ID_PCM_S8, MKTAG('N','O','N','E') },
27 { CODEC_ID_PCM_S24BE, MKTAG('N','O','N','E') },
28 { CODEC_ID_PCM_S32BE, MKTAG('N','O','N','E') },
29 { CODEC_ID_PCM_ALAW, MKTAG('a','l','a','w') },
30 { CODEC_ID_PCM_ALAW, MKTAG('A','L','A','W') },
31 { CODEC_ID_PCM_MULAW, MKTAG('u','l','a','w') },
32 { CODEC_ID_PCM_MULAW, MKTAG('U','L','A','W') },
33 { CODEC_ID_MACE3, MKTAG('M','A','C','3') },
34 { CODEC_ID_MACE6, MKTAG('M','A','C','6') },
35 { CODEC_ID_GSM, MKTAG('G','S','M',' ') },
36 { CODEC_ID_ADPCM_G726, MKTAG('G','7','2','6') },
37 { 0, 0 },
38};
39
40#define AIFF 0
41#define AIFF_C_VERSION1 0xA2805140
42
43static int aiff_codec_get_id (int bps)
44{
45 if (bps <= 8)
46 return CODEC_ID_PCM_S8;
47 if (bps <= 16)
48 return CODEC_ID_PCM_S16BE;
49 if (bps <= 24)
50 return CODEC_ID_PCM_S24BE;
51 if (bps <= 32)
52 return CODEC_ID_PCM_S32BE;
53
54 /* bigger than 32 isn't allowed */
55 return 0;
56}
57
58/* returns the size of the found tag */
59static int get_tag(ByteIOContext *pb, uint32_t * tag)
60{
61 int size;
62
63 if (url_feof(pb))
64 return AVERROR_IO;
65
66 *tag = get_le32(pb);
67 size = get_be32(pb);
68
69 if (size < 0)
70 size = 0x7fffffff;
71
72 return size;
73}
74
75/* Metadata string read */
76static void get_meta(ByteIOContext *pb, char * str, int strsize, int size)
77{
78 int res;
79
80 if (size > strsize-1)
81 res = get_buffer(pb, (uint8_t*)str, strsize-1);
82 else
83 res = get_buffer(pb, (uint8_t*)str, size);
84
85 if (res < 0)
86 return;
87
88 str[res] = 0;
89 if (size & 1)
90 size++;
91 size -= res;
92 if (size);
93 url_fskip(pb, size);
94}
95
96/* Returns the number of bits per second */
97static int fix_bps(int codec_id)
98{
99 switch (codec_id) {
100 case CODEC_ID_PCM_S8:
101 return 8;
102 case CODEC_ID_PCM_S16BE:
103 return 16;
104 case CODEC_ID_PCM_S24BE:
105 return 24;
106 case CODEC_ID_PCM_S32BE:
107 return 32;
108 }
109
110 return -1;
111}
112
113/* Returns the number of sound data frames or negative on error */
114static unsigned int get_aiff_header(ByteIOContext *pb, AVCodecContext *codec,
115 int size, unsigned version)
116{
117 AVExtFloat ext;
118 double sample_rate;
119 unsigned int num_frames;
120
121
122 if (size & 1)
123 size++;
124
125 codec->codec_type = CODEC_TYPE_AUDIO;
126 codec->channels = get_be16(pb);
127 num_frames = get_be32(pb);
128 codec->bits_per_sample = get_be16(pb);
129
130 get_buffer(pb, (uint8_t*)&ext, sizeof(ext));/* Sample rate is in */
131 sample_rate = av_ext2dbl(ext); /* 80 bits BE IEEE extended float */
132 codec->sample_rate = sample_rate;
133 size -= 18;
134
135 /* Got an AIFF-C? */
136 if (version == AIFF_C_VERSION1) {
137 codec->codec_tag = get_le32(pb);
138 codec->codec_id = codec_get_id (codec_aiff_tags, codec->codec_tag);
139
140 if (codec->codec_id == CODEC_ID_PCM_S16BE) {
141 codec->codec_id = aiff_codec_get_id (codec->bits_per_sample);
142 codec->bits_per_sample = fix_bps(codec->codec_id);
143 }
144
145 size -= 4;
146 } else {
147 /* Need the codec type */
148 codec->codec_id = aiff_codec_get_id (codec->bits_per_sample);
149 codec->bits_per_sample = fix_bps(codec->codec_id);
150 }
151
152 if (!codec->codec_id)
153 return AVERROR_INVALIDDATA;
154
155 /* Block align needs to be computed in all cases, as the definition
156 * is specific to applications -> here we use the WAVE format definition */
157 codec->block_align = (codec->bits_per_sample * codec->channels) >> 3;
158
159 codec->bit_rate = codec->sample_rate * codec->block_align;
160
161 /* Chunk is over */
162 if (size)
163 url_fseek(pb, size, SEEK_CUR);
164
165 return num_frames;
166}
167
168#ifdef CONFIG_MUXERS
169typedef struct {
170 offset_t form;
171 offset_t frames;
172 offset_t ssnd;
173} AIFFOutputContext;
174
175static int aiff_write_header(AVFormatContext *s)
176{
177 AIFFOutputContext *aiff = s->priv_data;
178 ByteIOContext *pb = &s->pb;
179 AVCodecContext *enc = s->streams[0]->codec;
180 AVExtFloat sample_rate;
181 int coder_len;
182
183 /* First verify if format is ok */
184 enc->codec_tag = codec_get_tag(codec_aiff_tags, enc->codec_id);
185 if (!enc->codec_tag) {
186 av_free(aiff);
187 return -1;
188 }
189
190 coder_len = strlen(enc->codec->name);
191
192 /* FORM AIFF header */
193 put_tag(pb, "FORM");
194 aiff->form = url_ftell(pb);
195 put_be32(pb, 0); /* file length */
196 put_tag(pb, "AIFC");
197
198 /* Version chunk */
199 put_tag(pb, "FVER");
200 put_be32(pb, 4);
201 put_be32(pb, 0xA2805140);
202
203 /* Common chunk */
204 put_tag(pb, "COMM");
205 if (coder_len & 1) /* Common chunk is of var size */
206 put_be32(pb, 23+coder_len);
207 else
208 put_be32(pb, 24+coder_len);
209 put_be16(pb, enc->channels); /* Number of channels */
210
211 aiff->frames = url_ftell(pb);
212 put_be32(pb, 0); /* Number of frames */
213
214 if (!enc->bits_per_sample)
215 enc->bits_per_sample = (enc->block_align<<3) / enc->channels;
216 put_be16(pb, enc->bits_per_sample); /* Sample size */
217
218 sample_rate = av_dbl2ext((double)enc->sample_rate);
219 put_buffer(pb, (uint8_t*)&sample_rate, sizeof(sample_rate));
220
221 put_le32(pb, enc->codec_tag);
222 if (coder_len & 1) {
223 put_byte(pb, coder_len);
224 put_buffer(pb, (const uint8_t*)enc->codec->name, coder_len);
225 } else {
226 put_byte(pb, coder_len+1);
227 put_buffer(pb, (const uint8_t*)enc->codec->name, coder_len);
228 put_byte(pb, 0);
229 }
230
231 /* Sound data chunk */
232 put_tag(pb, "SSND");
233 aiff->ssnd = url_ftell(pb); /* Sound chunk size */
234 put_be32(pb, 0); /* Sound samples data size */
235 put_be32(pb, 0); /* Data offset */
236 put_be32(pb, 0); /* Block-size (block align) */
237
238 av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
239
240 /* Data is starting here */
241 put_flush_packet(pb);
242
243 return 0;
244}
245
246static int aiff_write_packet(AVFormatContext *s, AVPacket *pkt)
247{
248 ByteIOContext *pb = &s->pb;
249 put_buffer(pb, pkt->data, pkt->size);
250 return 0;
251}
252
253static int aiff_write_trailer(AVFormatContext *s)
254{
255 ByteIOContext *pb = &s->pb;
256 AIFFOutputContext *aiff = s->priv_data;
257 AVCodecContext *enc = s->streams[0]->codec;
258
259 /* Chunks sizes must be even */
260 offset_t file_size, end_size;
261 end_size = file_size = url_ftell(pb);
262 if (file_size & 1) {
263 put_byte(pb, 0);
264 end_size++;
265 }
266
267 if (!url_is_streamed(&s->pb)) {
268 /* File length */
269 url_fseek(pb, aiff->form, SEEK_SET);
270 put_be32(pb, (uint32_t)(file_size - aiff->form - 4));
271
272 /* Number of sample frames */
273 url_fseek(pb, aiff->frames, SEEK_SET);
274 put_be32(pb, ((uint32_t)(file_size-aiff->ssnd-12))/enc->block_align);
275
276 /* Sound Data chunk size */
277 url_fseek(pb, aiff->ssnd, SEEK_SET);
278 put_be32(pb, (uint32_t)(file_size - aiff->ssnd - 4));
279
280 /* return to the end */
281 url_fseek(pb, end_size, SEEK_SET);
282
283 put_flush_packet(pb);
284 }
285
286 return 0;
287}
288#endif //CONFIG_MUXERS
289
290static int aiff_probe(AVProbeData *p)
291{
292 /* check file header */
293 if (p->buf_size < 16)
294 return 0;
295 if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
296 p->buf[2] == 'R' && p->buf[3] == 'M' &&
297 p->buf[8] == 'A' && p->buf[9] == 'I' &&
298 p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
299 return AVPROBE_SCORE_MAX;
300 else
301 return 0;
302}
303
304/* aiff input */
305static int aiff_read_header(AVFormatContext *s,
306 AVFormatParameters *ap)
307{
308 int size, filesize, offset;
309 uint32_t tag;
310 unsigned version = AIFF_C_VERSION1;
311 ByteIOContext *pb = &s->pb;
312 AVStream * st = s->streams[0];
313
314 /* check FORM header */
315 filesize = get_tag(pb, &tag);
316 if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
317 return AVERROR_INVALIDDATA;
318
319 /* AIFF data type */
320 tag = get_le32(pb);
321 if (tag == MKTAG('A', 'I', 'F', 'F')) /* Got an AIFF file */
322 version = AIFF;
323 else if (tag != MKTAG('A', 'I', 'F', 'C')) /* An AIFF-C file then */
324 return AVERROR_INVALIDDATA;
325
326 filesize -= 4;
327
328 st = av_new_stream(s, 0);
329 if (!st)
330 return AVERROR_NOMEM;
331
332 while (filesize > 0) {
333 /* parse different chunks */
334 size = get_tag(pb, &tag);
335 if (size < 0)
336 return size;
337
338 filesize -= size + 8;
339
340 switch (tag) {
341 case MKTAG('C', 'O', 'M', 'M'): /* Common chunk */
342 /* Then for the complete header info */
343 st->nb_frames = get_aiff_header (pb, st->codec, size, version);
344 if (st->nb_frames < 0)
345 return st->nb_frames;
346 break;
347
348 case MKTAG('F', 'V', 'E', 'R'): /* Version chunk */
349 version = get_be32(pb);
350 break;
351
352 case MKTAG('N', 'A', 'M', 'E'): /* Sample name chunk */
353 get_meta (pb, s->title, sizeof(s->title), size);
354 break;
355
356 case MKTAG('A', 'U', 'T', 'H'): /* Author chunk */
357 get_meta (pb, s->author, sizeof(s->author), size);
358 break;
359
360 case MKTAG('(', 'c', ')', ' '): /* Copyright chunk */
361 get_meta (pb, s->copyright, sizeof(s->copyright), size);
362 break;
363
364 case MKTAG('A', 'N', 'N', 'O'): /* Annotation chunk */
365 get_meta (pb, s->comment, sizeof(s->comment), size);
366 break;
367
368 case MKTAG('S', 'S', 'N', 'D'): /* Sampled sound chunk */
369 get_be32(pb); /* Block align... don't care */
370 offset = get_be32(pb); /* Offset of sound data */
371 goto got_sound;
372
373 default: /* Jump */
374 if (size & 1) /* Always even aligned */
375 size++;
376 url_fskip (pb, size);
377 }
378 }
379
380 /* End of loop and didn't get sound */
381 return AVERROR_INVALIDDATA;
382
383got_sound:
384 /* Now positioned, get the sound data start and end */
385 if (st->nb_frames)
386 s->file_size = st->nb_frames * st->codec->block_align;
387
388 av_set_pts_info(st, 64, 1, st->codec->sample_rate);
389 st->start_time = 0;
390 st->duration = st->nb_frames;
391
392 /* Position the stream at the first block */
393 url_fskip(pb, offset);
394
395 return 0;
396}
397
398#define MAX_SIZE 4096
399
400static int aiff_read_packet(AVFormatContext *s,
401 AVPacket *pkt)
402{
403 AVStream *st = s->streams[0];
404 int res;
405
406 /* End of stream may be reached */
407 if (url_feof(&s->pb))
408 return AVERROR_IO;
409
410 /* Now for that packet */
411 res = av_get_packet(&s->pb, pkt, (MAX_SIZE / st->codec->block_align) * st->codec->block_align);
412 if (res < 0)
413 return res;
414
415 /* Only one stream in an AIFF file */
416 pkt->stream_index = 0;
417 return 0;
418}
419
420static int aiff_read_close(AVFormatContext *s)
421{
422 return 0;
423}
424
425static int aiff_read_seek(AVFormatContext *s,
426 int stream_index, int64_t timestamp, int flags)
427{
428 return pcm_read_seek(s, stream_index, timestamp, flags);
429}
430
431
432static AVInputFormat aiff_demuxer = {
433 "aiff",
434 "Audio IFF",
435 0,
436 aiff_probe,
437 aiff_read_header,
438 aiff_read_packet,
439 aiff_read_close,
440 aiff_read_seek,
441};
442
443#ifdef CONFIG_MUXERS
444static AVOutputFormat aiff_muxer = {
445 "aiff",
446 "Audio IFF",
447 "audio/aiff",
448 "aif,aiff,afc,aifc",
449 sizeof(AIFFOutputContext),
450 CODEC_ID_PCM_S16BE,
451 CODEC_ID_NONE,
452 aiff_write_header,
453 aiff_write_packet,
454 aiff_write_trailer,
455};
456#endif //CONFIG_MUXERS
457
458int ff_aiff_init(void)
459{
460 av_register_input_format(&aiff_demuxer);
461#ifdef CONFIG_MUXERS
462 av_register_output_format(&aiff_muxer);
463#endif //CONFIG_MUXERS
464 return 0;
465}
466
Note: See TracBrowser for help on using the repository browser.

© 2024 Oracle Support Privacy / Do Not Sell My Info Terms of Use Trademark Policy Automated Access Etiquette