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"
31 #define AIFF_C_VERSION1 0xA2805140
38 static enum CodecID aiff_codec_get_id(int bps)
41 return CODEC_ID_PCM_S8;
43 return CODEC_ID_PCM_S16BE;
45 return CODEC_ID_PCM_S24BE;
47 return CODEC_ID_PCM_S32BE;
49 /* bigger than 32 isn't allowed */
53 /* returns the size of the found tag */
54 static int get_tag(AVIOContext *pb, uint32_t * tag)
70 /* Metadata string read */
71 static void get_meta(AVFormatContext *s, const char *key, int size)
73 uint8_t *str = av_malloc(size+1);
76 int res = avio_read(s->pb, str, size);
83 av_dict_set(&s->metadata, key, str, AV_DICT_DONT_STRDUP_VAL);
87 avio_skip(s->pb, size);
90 /* Returns the number of sound data frames or negative on error */
91 static unsigned int get_aiff_header(AVFormatContext *s, int size,
94 AVIOContext *pb = s->pb;
95 AVCodecContext *codec = s->streams[0]->codec;
96 AIFFInputContext *aiff = s->priv_data;
100 unsigned int num_frames;
104 codec->codec_type = AVMEDIA_TYPE_AUDIO;
105 codec->channels = avio_rb16(pb);
106 num_frames = avio_rb32(pb);
107 codec->bits_per_coded_sample = avio_rb16(pb);
111 sample_rate = ldexp(val, exp - 16383 - 63);
112 codec->sample_rate = sample_rate;
115 /* get codec id for AIFF-C */
116 if (version == AIFF_C_VERSION1) {
117 codec->codec_tag = avio_rl32(pb);
118 codec->codec_id = ff_codec_get_id(ff_codec_aiff_tags, codec->codec_tag);
122 if (version != AIFF_C_VERSION1 || codec->codec_id == CODEC_ID_PCM_S16BE) {
123 codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
124 codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
125 aiff->block_duration = 1;
127 switch (codec->codec_id) {
128 case CODEC_ID_PCM_F32BE:
129 case CODEC_ID_PCM_F64BE:
130 case CODEC_ID_PCM_S16LE:
131 case CODEC_ID_PCM_ALAW:
132 case CODEC_ID_PCM_MULAW:
133 aiff->block_duration = 1;
135 case CODEC_ID_ADPCM_IMA_QT:
136 codec->block_align = 34*codec->channels;
139 codec->block_align = 2*codec->channels;
142 codec->block_align = 1*codec->channels;
145 codec->block_align = 33;
148 codec->block_align = 35;
151 aiff->block_duration = 1;
154 if (codec->block_align > 0)
155 aiff->block_duration = av_get_audio_frame_duration(codec,
159 /* Block align needs to be computed in all cases, as the definition
160 * is specific to applications -> here we use the WAVE format definition */
161 if (!codec->block_align)
162 codec->block_align = (codec->bits_per_coded_sample * codec->channels) >> 3;
164 if (aiff->block_duration) {
165 codec->bit_rate = codec->sample_rate * (codec->block_align << 3) /
166 aiff->block_duration;
176 static int aiff_probe(AVProbeData *p)
178 /* check file header */
179 if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
180 p->buf[2] == 'R' && p->buf[3] == 'M' &&
181 p->buf[8] == 'A' && p->buf[9] == 'I' &&
182 p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
183 return AVPROBE_SCORE_MAX;
189 static int aiff_read_header(AVFormatContext *s)
194 unsigned version = AIFF_C_VERSION1;
195 AVIOContext *pb = s->pb;
197 AIFFInputContext *aiff = s->priv_data;
199 /* check FORM header */
200 filesize = get_tag(pb, &tag);
201 if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
202 return AVERROR_INVALIDDATA;
206 if (tag == MKTAG('A', 'I', 'F', 'F')) /* Got an AIFF file */
208 else if (tag != MKTAG('A', 'I', 'F', 'C')) /* An AIFF-C file then */
209 return AVERROR_INVALIDDATA;
213 st = avformat_new_stream(s, NULL);
215 return AVERROR(ENOMEM);
217 while (filesize > 0) {
218 /* parse different chunks */
219 size = get_tag(pb, &tag);
223 filesize -= size + 8;
226 case MKTAG('C', 'O', 'M', 'M'): /* Common chunk */
227 /* Then for the complete header info */
228 st->nb_frames = get_aiff_header(s, size, version);
229 if (st->nb_frames < 0)
230 return st->nb_frames;
231 if (offset > 0) // COMM is after SSND
234 case MKTAG('F', 'V', 'E', 'R'): /* Version chunk */
235 version = avio_rb32(pb);
237 case MKTAG('N', 'A', 'M', 'E'): /* Sample name chunk */
238 get_meta(s, "title" , size);
240 case MKTAG('A', 'U', 'T', 'H'): /* Author chunk */
241 get_meta(s, "author" , size);
243 case MKTAG('(', 'c', ')', ' '): /* Copyright chunk */
244 get_meta(s, "copyright", size);
246 case MKTAG('A', 'N', 'N', 'O'): /* Annotation chunk */
247 get_meta(s, "comment" , size);
249 case MKTAG('S', 'S', 'N', 'D'): /* Sampled sound chunk */
250 aiff->data_end = avio_tell(pb) + size;
251 offset = avio_rb32(pb); /* Offset of sound data */
252 avio_rb32(pb); /* BlockSize... don't care */
253 offset += avio_tell(pb); /* Compute absolute data offset */
254 if (st->codec->block_align) /* Assume COMM already parsed */
257 av_log(s, AV_LOG_ERROR, "file is not seekable\n");
260 avio_skip(pb, size - 8);
262 case MKTAG('w', 'a', 'v', 'e'):
263 if ((uint64_t)size > (1<<30))
265 st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
266 if (!st->codec->extradata)
267 return AVERROR(ENOMEM);
268 st->codec->extradata_size = size;
269 avio_read(pb, st->codec->extradata, size);
271 case MKTAG('C','H','A','N'):
273 return AVERROR_INVALIDDATA;
274 ff_mov_read_chan(s, size, st->codec);
277 if (size & 1) /* Always even aligned */
284 if (!st->codec->block_align) {
285 av_log(s, AV_LOG_ERROR, "could not find COMM tag or invalid block_align value\n");
289 /* Now positioned, get the sound data start and end */
290 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
292 st->duration = st->nb_frames * aiff->block_duration;
294 /* Position the stream at the first block */
295 avio_seek(pb, offset, SEEK_SET);
300 #define MAX_SIZE 4096
302 static int aiff_read_packet(AVFormatContext *s,
305 AVStream *st = s->streams[0];
306 AIFFInputContext *aiff = s->priv_data;
310 /* calculate size of remaining data */
311 max_size = aiff->data_end - avio_tell(s->pb);
315 /* Now for that packet */
316 if (st->codec->block_align >= 33) // GSM, QCLP, IMA4
317 size = st->codec->block_align;
319 size = (MAX_SIZE / st->codec->block_align) * st->codec->block_align;
320 size = FFMIN(max_size, size);
321 res = av_get_packet(s->pb, pkt, size);
325 /* Only one stream in an AIFF file */
326 pkt->stream_index = 0;
327 pkt->duration = (res / st->codec->block_align) * aiff->block_duration;
331 AVInputFormat ff_aiff_demuxer = {
333 .long_name = NULL_IF_CONFIG_SMALL("Audio IFF"),
334 .priv_data_size = sizeof(AIFFInputContext),
335 .read_probe = aiff_probe,
336 .read_header = aiff_read_header,
337 .read_packet = aiff_read_packet,
338 .read_seek = ff_pcm_read_seek,
339 .codec_tag = (const AVCodecTag* const []){ ff_codec_aiff_tags, 0 },