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/mathematics.h"
23 #include "libavutil/dict.h"
32 #define AIFF_C_VERSION1 0xA2805140
39 static enum CodecID aiff_codec_get_id(int bps)
42 return CODEC_ID_PCM_S8;
44 return CODEC_ID_PCM_S16BE;
46 return CODEC_ID_PCM_S24BE;
48 return CODEC_ID_PCM_S32BE;
50 /* bigger than 32 isn't allowed */
54 /* returns the size of the found tag */
55 static int get_tag(AVIOContext *pb, uint32_t * tag)
71 /* Metadata string read */
72 static void get_meta(AVFormatContext *s, const char *key, int size)
74 uint8_t *str = av_malloc(size+1);
77 int res = avio_read(s->pb, str, size);
84 av_dict_set(&s->metadata, key, str, AV_DICT_DONT_STRDUP_VAL);
88 avio_skip(s->pb, size);
91 /* Returns the number of sound data frames or negative on error */
92 static unsigned int get_aiff_header(AVFormatContext *s, int size,
95 AVIOContext *pb = s->pb;
96 AVCodecContext *codec = s->streams[0]->codec;
97 AIFFInputContext *aiff = s->priv_data;
101 unsigned int num_frames;
105 codec->codec_type = AVMEDIA_TYPE_AUDIO;
106 codec->channels = avio_rb16(pb);
107 num_frames = avio_rb32(pb);
108 codec->bits_per_coded_sample = avio_rb16(pb);
112 sample_rate = ldexp(val, exp - 16383 - 63);
113 codec->sample_rate = sample_rate;
116 /* get codec id for AIFF-C */
117 if (version == AIFF_C_VERSION1) {
118 codec->codec_tag = avio_rl32(pb);
119 codec->codec_id = ff_codec_get_id(ff_codec_aiff_tags, codec->codec_tag);
123 if (version != AIFF_C_VERSION1 || codec->codec_id == CODEC_ID_PCM_S16BE) {
124 codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
125 codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
126 aiff->block_duration = 1;
128 switch (codec->codec_id) {
129 case CODEC_ID_PCM_F32BE:
130 case CODEC_ID_PCM_F64BE:
131 case CODEC_ID_PCM_S16LE:
132 case CODEC_ID_PCM_ALAW:
133 case CODEC_ID_PCM_MULAW:
134 aiff->block_duration = 1;
136 case CODEC_ID_ADPCM_IMA_QT:
137 codec->block_align = 34*codec->channels;
140 codec->block_align = 2*codec->channels;
143 codec->block_align = 1*codec->channels;
146 codec->block_align = 33;
149 codec->block_align = 35;
152 aiff->block_duration = 1;
155 if (codec->block_align > 0)
156 aiff->block_duration = av_get_audio_frame_duration(codec,
160 /* Block align needs to be computed in all cases, as the definition
161 * is specific to applications -> here we use the WAVE format definition */
162 if (!codec->block_align)
163 codec->block_align = (codec->bits_per_coded_sample * codec->channels) >> 3;
165 if (aiff->block_duration) {
166 codec->bit_rate = codec->sample_rate * (codec->block_align << 3) /
167 aiff->block_duration;
177 static int aiff_probe(AVProbeData *p)
179 /* check file header */
180 if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
181 p->buf[2] == 'R' && p->buf[3] == 'M' &&
182 p->buf[8] == 'A' && p->buf[9] == 'I' &&
183 p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
184 return AVPROBE_SCORE_MAX;
190 static int aiff_read_header(AVFormatContext *s)
195 unsigned version = AIFF_C_VERSION1;
196 AVIOContext *pb = s->pb;
198 AIFFInputContext *aiff = s->priv_data;
199 ID3v2ExtraMeta *id3v2_extra_meta = NULL;
201 /* check FORM header */
202 filesize = get_tag(pb, &tag);
203 if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
204 return AVERROR_INVALIDDATA;
208 if (tag == MKTAG('A', 'I', 'F', 'F')) /* Got an AIFF file */
210 else if (tag != MKTAG('A', 'I', 'F', 'C')) /* An AIFF-C file then */
211 return AVERROR_INVALIDDATA;
215 st = avformat_new_stream(s, NULL);
217 return AVERROR(ENOMEM);
219 while (filesize > 0) {
220 /* parse different chunks */
221 size = get_tag(pb, &tag);
225 filesize -= size + 8;
228 case MKTAG('C', 'O', 'M', 'M'): /* Common chunk */
229 /* Then for the complete header info */
230 st->nb_frames = get_aiff_header(s, size, version);
231 if (st->nb_frames < 0)
232 return st->nb_frames;
233 if (offset > 0) // COMM is after SSND
236 case MKTAG('I', 'D', '3', ' '):
237 ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
238 ff_id3v2_free_extra_meta(&id3v2_extra_meta);
240 case MKTAG('F', 'V', 'E', 'R'): /* Version chunk */
241 version = avio_rb32(pb);
243 case MKTAG('N', 'A', 'M', 'E'): /* Sample name chunk */
244 get_meta(s, "title" , size);
246 case MKTAG('A', 'U', 'T', 'H'): /* Author chunk */
247 get_meta(s, "author" , size);
249 case MKTAG('(', 'c', ')', ' '): /* Copyright chunk */
250 get_meta(s, "copyright", size);
252 case MKTAG('A', 'N', 'N', 'O'): /* Annotation chunk */
253 get_meta(s, "comment" , size);
255 case MKTAG('S', 'S', 'N', 'D'): /* Sampled sound chunk */
256 aiff->data_end = avio_tell(pb) + size;
257 offset = avio_rb32(pb); /* Offset of sound data */
258 avio_rb32(pb); /* BlockSize... don't care */
259 offset += avio_tell(pb); /* Compute absolute data offset */
260 if (st->codec->block_align) /* Assume COMM already parsed */
263 av_log(s, AV_LOG_ERROR, "file is not seekable\n");
266 avio_skip(pb, size - 8);
268 case MKTAG('w', 'a', 'v', 'e'):
269 if ((uint64_t)size > (1<<30))
271 st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
272 if (!st->codec->extradata)
273 return AVERROR(ENOMEM);
274 st->codec->extradata_size = size;
275 avio_read(pb, st->codec->extradata, size);
277 case MKTAG('C','H','A','N'):
279 return AVERROR_INVALIDDATA;
280 ff_mov_read_chan(s, size, st->codec);
283 if (size & 1) /* Always even aligned */
290 if (!st->codec->block_align) {
291 av_log(s, AV_LOG_ERROR, "could not find COMM tag or invalid block_align value\n");
295 /* Now positioned, get the sound data start and end */
296 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
298 st->duration = st->nb_frames * aiff->block_duration;
300 /* Position the stream at the first block */
301 avio_seek(pb, offset, SEEK_SET);
306 #define MAX_SIZE 4096
308 static int aiff_read_packet(AVFormatContext *s,
311 AVStream *st = s->streams[0];
312 AIFFInputContext *aiff = s->priv_data;
316 /* calculate size of remaining data */
317 max_size = aiff->data_end - avio_tell(s->pb);
321 /* Now for that packet */
322 if (st->codec->block_align >= 33) // GSM, QCLP, IMA4
323 size = st->codec->block_align;
325 size = (MAX_SIZE / st->codec->block_align) * st->codec->block_align;
326 size = FFMIN(max_size, size);
327 res = av_get_packet(s->pb, pkt, size);
331 if (size >= st->codec->block_align)
332 pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
333 /* Only one stream in an AIFF file */
334 pkt->stream_index = 0;
335 pkt->duration = (res / st->codec->block_align) * aiff->block_duration;
339 AVInputFormat ff_aiff_demuxer = {
341 .long_name = NULL_IF_CONFIG_SMALL("Audio IFF"),
342 .priv_data_size = sizeof(AIFFInputContext),
343 .read_probe = aiff_probe,
344 .read_header = aiff_read_header,
345 .read_packet = aiff_read_packet,
346 .read_seek = ff_pcm_read_seek,
347 .codec_tag = (const AVCodecTag* const []){ ff_codec_aiff_tags, 0 },