3 * Copyright (c) 2006 Patrick Guimond
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/intreadwrite.h"
23 #include "libavutil/mathematics.h"
24 #include "libavutil/dict.h"
34 #define AIFF_C_VERSION1 0xA2805140
36 typedef struct AIFFInputContext {
41 static enum AVCodecID aiff_codec_get_id(int bps)
44 return AV_CODEC_ID_PCM_S8;
46 return AV_CODEC_ID_PCM_S16BE;
48 return AV_CODEC_ID_PCM_S24BE;
50 return AV_CODEC_ID_PCM_S32BE;
52 /* bigger than 32 isn't allowed */
53 return AV_CODEC_ID_NONE;
56 /* returns the size of the found tag */
57 static int get_tag(AVIOContext *pb, uint32_t * tag)
73 /* Metadata string read */
74 static void get_meta(AVFormatContext *s, const char *key, int size)
76 uint8_t *str = av_malloc(size+1);
79 int res = avio_read(s->pb, str, size);
86 av_dict_set(&s->metadata, key, str, AV_DICT_DONT_STRDUP_VAL);
90 avio_skip(s->pb, size);
93 /* Returns the number of sound data frames or negative on error */
94 static int get_aiff_header(AVFormatContext *s, int size,
97 AVIOContext *pb = s->pb;
98 AVCodecContext *codec = s->streams[0]->codec;
99 AIFFInputContext *aiff = s->priv_data;
103 unsigned int num_frames;
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);
112 exp = avio_rb16(pb) - 16383 - 63;
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;
119 sample_rate = val << exp;
121 sample_rate = (val + (1ULL<<(-exp-1))) >> -exp;
122 codec->sample_rate = sample_rate;
125 /* get codec id for AIFF-C */
128 } else if (version == AIFF_C_VERSION1) {
129 codec->codec_tag = avio_rl32(pb);
130 codec->codec_id = ff_codec_get_id(ff_codec_aiff_tags, codec->codec_tag);
131 if (codec->codec_id == AV_CODEC_ID_NONE) {
133 av_get_codec_tag_string(tag, sizeof(tag), codec->codec_tag);
134 avpriv_request_sample(s, "unknown or unsupported codec tag: %s", tag);
139 if (version != AIFF_C_VERSION1 || codec->codec_id == AV_CODEC_ID_PCM_S16BE) {
140 codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
141 codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
142 aiff->block_duration = 1;
144 switch (codec->codec_id) {
145 case AV_CODEC_ID_PCM_F32BE:
146 case AV_CODEC_ID_PCM_F64BE:
147 case AV_CODEC_ID_PCM_S16LE:
148 case AV_CODEC_ID_PCM_ALAW:
149 case AV_CODEC_ID_PCM_MULAW:
150 aiff->block_duration = 1;
152 case AV_CODEC_ID_ADPCM_IMA_QT:
153 codec->block_align = 34*codec->channels;
155 case AV_CODEC_ID_MACE3:
156 codec->block_align = 2*codec->channels;
158 case AV_CODEC_ID_ADPCM_G726LE:
159 codec->bits_per_coded_sample = 5;
160 case AV_CODEC_ID_ADPCM_G722:
161 case AV_CODEC_ID_MACE6:
162 case AV_CODEC_ID_SDX2_DPCM:
163 codec->block_align = 1*codec->channels;
165 case AV_CODEC_ID_GSM:
166 codec->block_align = 33;
169 aiff->block_duration = 1;
172 if (codec->block_align > 0)
173 aiff->block_duration = av_get_audio_frame_duration(codec,
177 /* Block align needs to be computed in all cases, as the definition
178 * is specific to applications -> here we use the WAVE format definition */
179 if (!codec->block_align)
180 codec->block_align = (av_get_bits_per_sample(codec->codec_id) * codec->channels) >> 3;
182 if (aiff->block_duration) {
183 codec->bit_rate = codec->sample_rate * (codec->block_align << 3) /
184 aiff->block_duration;
194 static int aiff_probe(AVProbeData *p)
196 /* check file header */
197 if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
198 p->buf[2] == 'R' && p->buf[3] == 'M' &&
199 p->buf[8] == 'A' && p->buf[9] == 'I' &&
200 p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
201 return AVPROBE_SCORE_MAX;
207 static int aiff_read_header(AVFormatContext *s)
209 int ret, size, filesize;
210 int64_t offset = 0, position;
212 unsigned version = AIFF_C_VERSION1;
213 AVIOContext *pb = s->pb;
215 AIFFInputContext *aiff = s->priv_data;
216 ID3v2ExtraMeta *id3v2_extra_meta = NULL;
218 /* check FORM header */
219 filesize = get_tag(pb, &tag);
220 if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
221 return AVERROR_INVALIDDATA;
225 if (tag == MKTAG('A', 'I', 'F', 'F')) /* Got an AIFF file */
227 else if (tag != MKTAG('A', 'I', 'F', 'C')) /* An AIFF-C file then */
228 return AVERROR_INVALIDDATA;
232 st = avformat_new_stream(s, NULL);
234 return AVERROR(ENOMEM);
236 while (filesize > 0) {
237 /* parse different chunks */
238 size = get_tag(pb, &tag);
240 if (size == AVERROR_EOF && offset > 0 && st->codec->block_align) {
241 av_log(s, AV_LOG_WARNING, "header parser hit EOF\n");
247 filesize -= size + 8;
250 case MKTAG('C', 'O', 'M', 'M'): /* Common chunk */
251 /* Then for the complete header info */
252 st->nb_frames = get_aiff_header(s, size, version);
253 if (st->nb_frames < 0)
254 return st->nb_frames;
255 if (offset > 0) // COMM is after SSND
258 case MKTAG('I', 'D', '3', ' '):
259 position = avio_tell(pb);
260 ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, size);
261 if (id3v2_extra_meta)
262 if ((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta)) < 0) {
263 ff_id3v2_free_extra_meta(&id3v2_extra_meta);
266 ff_id3v2_free_extra_meta(&id3v2_extra_meta);
267 if (position + size > avio_tell(pb))
268 avio_skip(pb, position + size - avio_tell(pb));
270 case MKTAG('F', 'V', 'E', 'R'): /* Version chunk */
271 version = avio_rb32(pb);
273 case MKTAG('N', 'A', 'M', 'E'): /* Sample name chunk */
274 get_meta(s, "title" , size);
276 case MKTAG('A', 'U', 'T', 'H'): /* Author chunk */
277 get_meta(s, "author" , size);
279 case MKTAG('(', 'c', ')', ' '): /* Copyright chunk */
280 get_meta(s, "copyright", size);
282 case MKTAG('A', 'N', 'N', 'O'): /* Annotation chunk */
283 get_meta(s, "comment" , size);
285 case MKTAG('S', 'S', 'N', 'D'): /* Sampled sound chunk */
286 aiff->data_end = avio_tell(pb) + size;
287 offset = avio_rb32(pb); /* Offset of sound data */
288 avio_rb32(pb); /* BlockSize... don't care */
289 offset += avio_tell(pb); /* Compute absolute data offset */
290 if (st->codec->block_align && !pb->seekable) /* Assume COMM already parsed */
293 av_log(s, AV_LOG_ERROR, "file is not seekable\n");
296 avio_skip(pb, size - 8);
298 case MKTAG('w', 'a', 'v', 'e'):
299 if ((uint64_t)size > (1<<30))
301 if (ff_get_extradata(st->codec, pb, size) < 0)
302 return AVERROR(ENOMEM);
303 if (st->codec->codec_id == AV_CODEC_ID_QDM2 && size>=12*4 && !st->codec->block_align) {
304 st->codec->block_align = AV_RB32(st->codec->extradata+11*4);
305 aiff->block_duration = AV_RB32(st->codec->extradata+9*4);
306 } else if (st->codec->codec_id == AV_CODEC_ID_QCELP) {
309 rate = st->codec->extradata[24];
311 case 'H': // RATE_HALF
312 st->codec->block_align = 17;
314 case 'F': // RATE_FULL
316 st->codec->block_align = 35;
318 aiff->block_duration = 160;
319 st->codec->bit_rate = st->codec->sample_rate * (st->codec->block_align << 3) /
320 aiff->block_duration;
323 case MKTAG('C','H','A','N'):
324 if(ff_mov_read_chan(s, pb, st, size) < 0)
325 return AVERROR_INVALIDDATA;
328 if (offset > 0 && st->codec->block_align) // COMM && SSND
331 if (size & 1) /* Always even aligned */
338 if (!st->codec->block_align) {
339 av_log(s, AV_LOG_ERROR, "could not find COMM tag or invalid block_align value\n");
343 /* Now positioned, get the sound data start and end */
344 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
346 st->duration = st->nb_frames * aiff->block_duration;
348 /* Position the stream at the first block */
349 avio_seek(pb, offset, SEEK_SET);
354 #define MAX_SIZE 4096
356 static int aiff_read_packet(AVFormatContext *s,
359 AVStream *st = s->streams[0];
360 AIFFInputContext *aiff = s->priv_data;
364 /* calculate size of remaining data */
365 max_size = aiff->data_end - avio_tell(s->pb);
369 /* Now for that packet */
370 switch (st->codec->codec_id) {
371 case AV_CODEC_ID_ADPCM_IMA_QT:
372 case AV_CODEC_ID_GSM:
373 case AV_CODEC_ID_QDM2:
374 case AV_CODEC_ID_QCELP:
375 size = st->codec->block_align;
378 size = (MAX_SIZE / st->codec->block_align) * st->codec->block_align;
380 size = FFMIN(max_size, size);
381 res = av_get_packet(s->pb, pkt, size);
385 if (size >= st->codec->block_align)
386 pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
387 /* Only one stream in an AIFF file */
388 pkt->stream_index = 0;
389 pkt->duration = (res / st->codec->block_align) * aiff->block_duration;
393 AVInputFormat ff_aiff_demuxer = {
395 .long_name = NULL_IF_CONFIG_SMALL("Audio IFF"),
396 .priv_data_size = sizeof(AIFFInputContext),
397 .read_probe = aiff_probe,
398 .read_header = aiff_read_header,
399 .read_packet = aiff_read_packet,
400 .read_seek = ff_pcm_read_seek,
401 .codec_tag = (const AVCodecTag* const []){ ff_codec_aiff_tags, 0 },