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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 | ||
36 | typedef struct { | |
37 | int64_t data_end; | |
38 | int block_duration; | |
39 | } AIFFInputContext; | |
40 | ||
41 | static 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 */ | |
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 += (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 */ | |
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++; | |
107 | codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
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); | |
121 | codec->codec_id = ff_codec_get_id(ff_codec_aiff_tags, codec->codec_tag); | |
122 | size -= 4; | |
123 | } | |
124 | ||
125 | if (version != AIFF_C_VERSION1 || codec->codec_id == AV_CODEC_ID_PCM_S16BE) { | |
126 | codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample); | |
127 | codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id); | |
128 | aiff->block_duration = 1; | |
129 | } else { | |
130 | switch (codec->codec_id) { | |
131 | case AV_CODEC_ID_PCM_F32BE: | |
132 | case AV_CODEC_ID_PCM_F64BE: | |
133 | case AV_CODEC_ID_PCM_S16LE: | |
134 | case AV_CODEC_ID_PCM_ALAW: | |
135 | case AV_CODEC_ID_PCM_MULAW: | |
136 | aiff->block_duration = 1; | |
137 | break; | |
138 | case AV_CODEC_ID_ADPCM_IMA_QT: | |
139 | codec->block_align = 34*codec->channels; | |
140 | break; | |
141 | case AV_CODEC_ID_MACE3: | |
142 | codec->block_align = 2*codec->channels; | |
143 | break; | |
144 | case AV_CODEC_ID_ADPCM_G726LE: | |
145 | codec->bits_per_coded_sample = 5; | |
146 | case AV_CODEC_ID_ADPCM_G722: | |
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) | |
158 | aiff->block_duration = av_get_audio_frame_duration(codec, | |
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 */ | |
192 | static int aiff_read_header(AVFormatContext *s) | |
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, size); | |
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_get_extradata(st->codec, pb, size) < 0) | |
282 | return AVERROR(ENOMEM); | |
283 | if (st->codec->codec_id == AV_CODEC_ID_QDM2 && size>=12*4 && !st->codec->block_align) { | |
284 | st->codec->block_align = AV_RB32(st->codec->extradata+11*4); | |
285 | aiff->block_duration = AV_RB32(st->codec->extradata+9*4); | |
286 | } else if (st->codec->codec_id == AV_CODEC_ID_QCELP) { | |
287 | char rate = 0; | |
288 | if (size >= 25) | |
289 | rate = st->codec->extradata[24]; | |
290 | switch (rate) { | |
291 | case 'H': // RATE_HALF | |
292 | st->codec->block_align = 17; | |
293 | break; | |
294 | case 'F': // RATE_FULL | |
295 | default: | |
296 | st->codec->block_align = 35; | |
297 | } | |
298 | aiff->block_duration = 160; | |
299 | st->codec->bit_rate = st->codec->sample_rate * (st->codec->block_align << 3) / | |
300 | aiff->block_duration; | |
301 | } | |
302 | break; | |
303 | case MKTAG('C','H','A','N'): | |
304 | if(ff_mov_read_chan(s, pb, st, size) < 0) | |
305 | return AVERROR_INVALIDDATA; | |
306 | break; | |
307 | default: /* Jump */ | |
308 | if (size & 1) /* Always even aligned */ | |
309 | size++; | |
310 | avio_skip(pb, size); | |
311 | } | |
312 | } | |
313 | ||
314 | got_sound: | |
315 | if (!st->codec->block_align) { | |
316 | av_log(s, AV_LOG_ERROR, "could not find COMM tag or invalid block_align value\n"); | |
317 | return -1; | |
318 | } | |
319 | ||
320 | /* Now positioned, get the sound data start and end */ | |
321 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); | |
322 | st->start_time = 0; | |
323 | st->duration = st->nb_frames * aiff->block_duration; | |
324 | ||
325 | /* Position the stream at the first block */ | |
326 | avio_seek(pb, offset, SEEK_SET); | |
327 | ||
328 | return 0; | |
329 | } | |
330 | ||
331 | #define MAX_SIZE 4096 | |
332 | ||
333 | static int aiff_read_packet(AVFormatContext *s, | |
334 | AVPacket *pkt) | |
335 | { | |
336 | AVStream *st = s->streams[0]; | |
337 | AIFFInputContext *aiff = s->priv_data; | |
338 | int64_t max_size; | |
339 | int res, size; | |
340 | ||
341 | /* calculate size of remaining data */ | |
342 | max_size = aiff->data_end - avio_tell(s->pb); | |
343 | if (max_size <= 0) | |
344 | return AVERROR_EOF; | |
345 | ||
346 | /* Now for that packet */ | |
347 | switch (st->codec->codec_id) { | |
348 | case AV_CODEC_ID_ADPCM_IMA_QT: | |
349 | case AV_CODEC_ID_GSM: | |
350 | case AV_CODEC_ID_QDM2: | |
351 | case AV_CODEC_ID_QCELP: | |
352 | size = st->codec->block_align; | |
353 | break; | |
354 | default: | |
355 | size = (MAX_SIZE / st->codec->block_align) * st->codec->block_align; | |
356 | } | |
357 | size = FFMIN(max_size, size); | |
358 | res = av_get_packet(s->pb, pkt, size); | |
359 | if (res < 0) | |
360 | return res; | |
361 | ||
362 | if (size >= st->codec->block_align) | |
363 | pkt->flags &= ~AV_PKT_FLAG_CORRUPT; | |
364 | /* Only one stream in an AIFF file */ | |
365 | pkt->stream_index = 0; | |
366 | pkt->duration = (res / st->codec->block_align) * aiff->block_duration; | |
367 | return 0; | |
368 | } | |
369 | ||
370 | AVInputFormat ff_aiff_demuxer = { | |
371 | .name = "aiff", | |
372 | .long_name = NULL_IF_CONFIG_SMALL("Audio IFF"), | |
373 | .priv_data_size = sizeof(AIFFInputContext), | |
374 | .read_probe = aiff_probe, | |
375 | .read_header = aiff_read_header, | |
376 | .read_packet = aiff_read_packet, | |
377 | .read_seek = ff_pcm_read_seek, | |
378 | .codec_tag = (const AVCodecTag* const []){ ff_codec_aiff_tags, 0 }, | |
379 | }; |