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path: root/libavformat/aiffdec.c (plain)
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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
36typedef struct AIFFInputContext {
37 int64_t data_end;
38 int block_duration;
39} AIFFInputContext;
40
41static enum AVCodecID aiff_codec_get_id(int bps)
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 */
57static 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 */
74static 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;
86 av_dict_set(&s->metadata, key, str, AV_DICT_DONT_STRDUP_VAL);
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 */
94static int get_aiff_header(AVFormatContext *s, int size,
95 unsigned version)
96{
97 AVIOContext *pb = s->pb;
98 AVCodecParameters *par = s->streams[0]->codecpar;
99 AIFFInputContext *aiff = s->priv_data;
100 int exp;
101 uint64_t val;
102 int sample_rate;
103 unsigned int num_frames;
104
105 if (size & 1)
106 size++;
107 par->codec_type = AVMEDIA_TYPE_AUDIO;
108 par->channels = avio_rb16(pb);
109 num_frames = avio_rb32(pb);
110 par->bits_per_coded_sample = avio_rb16(pb);
111
112 exp = avio_rb16(pb) - 16383 - 63;
113 val = avio_rb64(pb);
114 if (exp <-63 || exp >63) {
115 av_log(s, AV_LOG_ERROR, "exp %d is out of range\n", exp);
116 return AVERROR_INVALIDDATA;
117 }
118 if (exp >= 0)
119 sample_rate = val << exp;
120 else
121 sample_rate = (val + (1ULL<<(-exp-1))) >> -exp;
122 par->sample_rate = sample_rate;
123 size -= 18;
124
125 /* get codec id for AIFF-C */
126 if (size < 4) {
127 version = AIFF;
128 } else if (version == AIFF_C_VERSION1) {
129 par->codec_tag = avio_rl32(pb);
130 par->codec_id = ff_codec_get_id(ff_codec_aiff_tags, par->codec_tag);
131 if (par->codec_id == AV_CODEC_ID_NONE)
132 avpriv_request_sample(s, "unknown or unsupported codec tag: %s",
133 av_fourcc2str(par->codec_tag));
134 size -= 4;
135 }
136
137 if (version != AIFF_C_VERSION1 || par->codec_id == AV_CODEC_ID_PCM_S16BE) {
138 par->codec_id = aiff_codec_get_id(par->bits_per_coded_sample);
139 par->bits_per_coded_sample = av_get_bits_per_sample(par->codec_id);
140 aiff->block_duration = 1;
141 } else {
142 switch (par->codec_id) {
143 case AV_CODEC_ID_PCM_F32BE:
144 case AV_CODEC_ID_PCM_F64BE:
145 case AV_CODEC_ID_PCM_S16LE:
146 case AV_CODEC_ID_PCM_ALAW:
147 case AV_CODEC_ID_PCM_MULAW:
148 aiff->block_duration = 1;
149 break;
150 case AV_CODEC_ID_ADPCM_IMA_QT:
151 par->block_align = 34 * par->channels;
152 break;
153 case AV_CODEC_ID_MACE3:
154 par->block_align = 2 * par->channels;
155 break;
156 case AV_CODEC_ID_ADPCM_G726LE:
157 par->bits_per_coded_sample = 5;
158 case AV_CODEC_ID_ADPCM_IMA_WS:
159 case AV_CODEC_ID_ADPCM_G722:
160 case AV_CODEC_ID_MACE6:
161 case AV_CODEC_ID_SDX2_DPCM:
162 par->block_align = 1 * par->channels;
163 break;
164 case AV_CODEC_ID_GSM:
165 par->block_align = 33;
166 break;
167 default:
168 aiff->block_duration = 1;
169 break;
170 }
171 if (par->block_align > 0)
172 aiff->block_duration = av_get_audio_frame_duration2(par,
173 par->block_align);
174 }
175
176 /* Block align needs to be computed in all cases, as the definition
177 * is specific to applications -> here we use the WAVE format definition */
178 if (!par->block_align)
179 par->block_align = (av_get_bits_per_sample(par->codec_id) * par->channels) >> 3;
180
181 if (aiff->block_duration) {
182 par->bit_rate = (int64_t)par->sample_rate * (par->block_align << 3) /
183 aiff->block_duration;
184 }
185
186 /* Chunk is over */
187 if (size)
188 avio_skip(pb, size);
189
190 return num_frames;
191}
192
193static int aiff_probe(AVProbeData *p)
194{
195 /* check file header */
196 if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
197 p->buf[2] == 'R' && p->buf[3] == 'M' &&
198 p->buf[8] == 'A' && p->buf[9] == 'I' &&
199 p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
200 return AVPROBE_SCORE_MAX;
201 else
202 return 0;
203}
204
205/* aiff input */
206static int aiff_read_header(AVFormatContext *s)
207{
208 int ret, size, filesize;
209 int64_t offset = 0, position;
210 uint32_t tag;
211 unsigned version = AIFF_C_VERSION1;
212 AVIOContext *pb = s->pb;
213 AVStream * st;
214 AIFFInputContext *aiff = s->priv_data;
215 ID3v2ExtraMeta *id3v2_extra_meta = NULL;
216
217 /* check FORM header */
218 filesize = get_tag(pb, &tag);
219 if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
220 return AVERROR_INVALIDDATA;
221
222 /* AIFF data type */
223 tag = avio_rl32(pb);
224 if (tag == MKTAG('A', 'I', 'F', 'F')) /* Got an AIFF file */
225 version = AIFF;
226 else if (tag != MKTAG('A', 'I', 'F', 'C')) /* An AIFF-C file then */
227 return AVERROR_INVALIDDATA;
228
229 filesize -= 4;
230
231 st = avformat_new_stream(s, NULL);
232 if (!st)
233 return AVERROR(ENOMEM);
234
235 while (filesize > 0) {
236 /* parse different chunks */
237 size = get_tag(pb, &tag);
238
239 if (size == AVERROR_EOF && offset > 0 && st->codecpar->block_align) {
240 av_log(s, AV_LOG_WARNING, "header parser hit EOF\n");
241 goto got_sound;
242 }
243 if (size < 0)
244 return size;
245
246 filesize -= size + 8;
247
248 switch (tag) {
249 case MKTAG('C', 'O', 'M', 'M'): /* Common chunk */
250 /* Then for the complete header info */
251 st->nb_frames = get_aiff_header(s, size, version);
252 if (st->nb_frames < 0)
253 return st->nb_frames;
254 if (offset > 0) // COMM is after SSND
255 goto got_sound;
256 break;
257 case MKTAG('I', 'D', '3', ' '):
258 position = avio_tell(pb);
259 ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, size);
260 if (id3v2_extra_meta)
261 if ((ret = ff_id3v2_parse_apic(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);
302 if ( (st->codecpar->codec_id == AV_CODEC_ID_QDMC || st->codecpar->codec_id == AV_CODEC_ID_QDM2)
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 0:
328 if (offset > 0 && st->codecpar->block_align) // COMM && SSND
329 goto got_sound;
330 default: /* Jump */
331 avio_skip(pb, size);
332 }
333
334 /* Skip required padding byte for odd-sized chunks. */
335 if (size & 1) {
336 filesize--;
337 avio_skip(pb, 1);
338 }
339 }
340
341got_sound:
342 if (!st->codecpar->block_align && st->codecpar->codec_id == AV_CODEC_ID_QCELP) {
343 av_log(s, AV_LOG_WARNING, "qcelp without wave chunk, assuming full rate\n");
344 st->codecpar->block_align = 35;
345 } else if (!st->codecpar->block_align) {
346 av_log(s, AV_LOG_ERROR, "could not find COMM tag or invalid block_align value\n");
347 return -1;
348 }
349
350 /* Now positioned, get the sound data start and end */
351 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
352 st->start_time = 0;
353 st->duration = st->nb_frames * aiff->block_duration;
354
355 /* Position the stream at the first block */
356 avio_seek(pb, offset, SEEK_SET);
357
358 return 0;
359}
360
361#define MAX_SIZE 4096
362
363static int aiff_read_packet(AVFormatContext *s,
364 AVPacket *pkt)
365{
366 AVStream *st = s->streams[0];
367 AIFFInputContext *aiff = s->priv_data;
368 int64_t max_size;
369 int res, size;
370
371 /* calculate size of remaining data */
372 max_size = aiff->data_end - avio_tell(s->pb);
373 if (max_size <= 0)
374 return AVERROR_EOF;
375
376 if (!st->codecpar->block_align) {
377 av_log(s, AV_LOG_ERROR, "block_align not set\n");
378 return AVERROR_INVALIDDATA;
379 }
380
381 /* Now for that packet */
382 switch (st->codecpar->codec_id) {
383 case AV_CODEC_ID_ADPCM_IMA_QT:
384 case AV_CODEC_ID_GSM:
385 case AV_CODEC_ID_QDM2:
386 case AV_CODEC_ID_QCELP:
387 size = st->codecpar->block_align;
388 break;
389 default:
390 size = st->codecpar->block_align ? (MAX_SIZE / st->codecpar->block_align) * st->codecpar->block_align : MAX_SIZE;
391 }
392 size = FFMIN(max_size, size);
393 res = av_get_packet(s->pb, pkt, size);
394 if (res < 0)
395 return res;
396
397 if (size >= st->codecpar->block_align)
398 pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
399 /* Only one stream in an AIFF file */
400 pkt->stream_index = 0;
401 pkt->duration = (res / st->codecpar->block_align) * aiff->block_duration;
402 return 0;
403}
404
405AVInputFormat ff_aiff_demuxer = {
406 .name = "aiff",
407 .long_name = NULL_IF_CONFIG_SMALL("Audio IFF"),
408 .priv_data_size = sizeof(AIFFInputContext),
409 .read_probe = aiff_probe,
410 .read_header = aiff_read_header,
411 .read_packet = aiff_read_packet,
412 .read_seek = ff_pcm_read_seek,
413 .codec_tag = (const AVCodecTag* const []){ ff_codec_aiff_tags, 0 },
414};
415
generated by cgit at 2024-05-17 18:48:56 (GMT)