2 * AIFF/AIFF-C muxer and demuxer
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 "allformats.h"
24 #include "intfloat_readwrite.h"
26 static const AVCodecTag codec_aiff_tags[] = {
27 { CODEC_ID_PCM_S16BE, MKTAG('N','O','N','E') },
28 { CODEC_ID_PCM_S8, MKTAG('N','O','N','E') },
29 { CODEC_ID_PCM_S24BE, MKTAG('N','O','N','E') },
30 { CODEC_ID_PCM_S32BE, MKTAG('N','O','N','E') },
31 { CODEC_ID_PCM_ALAW, MKTAG('a','l','a','w') },
32 { CODEC_ID_PCM_ALAW, MKTAG('A','L','A','W') },
33 { CODEC_ID_PCM_MULAW, MKTAG('u','l','a','w') },
34 { CODEC_ID_PCM_MULAW, MKTAG('U','L','A','W') },
35 { CODEC_ID_MACE3, MKTAG('M','A','C','3') },
36 { CODEC_ID_MACE6, MKTAG('M','A','C','6') },
37 { CODEC_ID_GSM, MKTAG('G','S','M',' ') },
38 { CODEC_ID_ADPCM_G726, MKTAG('G','7','2','6') },
43 #define AIFF_C_VERSION1 0xA2805140
45 static int aiff_codec_get_id (int bps)
48 return CODEC_ID_PCM_S8;
50 return CODEC_ID_PCM_S16BE;
52 return CODEC_ID_PCM_S24BE;
54 return CODEC_ID_PCM_S32BE;
56 /* bigger than 32 isn't allowed */
60 /* returns the size of the found tag */
61 static int get_tag(ByteIOContext *pb, uint32_t * tag)
77 /* Metadata string read */
78 static void get_meta(ByteIOContext *pb, char * str, int strsize, int size)
83 res = get_buffer(pb, (uint8_t*)str, strsize-1);
85 res = get_buffer(pb, (uint8_t*)str, size);
98 /* Returns the number of sound data frames or negative on error */
99 static unsigned int get_aiff_header(ByteIOContext *pb, AVCodecContext *codec,
100 int size, unsigned version)
104 unsigned int num_frames;
110 codec->codec_type = CODEC_TYPE_AUDIO;
111 codec->channels = get_be16(pb);
112 num_frames = get_be32(pb);
113 codec->bits_per_sample = get_be16(pb);
115 get_buffer(pb, (uint8_t*)&ext, sizeof(ext));/* Sample rate is in */
116 sample_rate = av_ext2dbl(ext); /* 80 bits BE IEEE extended float */
117 codec->sample_rate = sample_rate;
121 if (version == AIFF_C_VERSION1) {
122 codec->codec_tag = get_le32(pb);
123 codec->codec_id = codec_get_id (codec_aiff_tags, codec->codec_tag);
125 if (codec->codec_id == CODEC_ID_PCM_S16BE) {
126 codec->codec_id = aiff_codec_get_id (codec->bits_per_sample);
127 codec->bits_per_sample = av_get_bits_per_sample(codec->codec_id);
132 /* Need the codec type */
133 codec->codec_id = aiff_codec_get_id (codec->bits_per_sample);
134 codec->bits_per_sample = av_get_bits_per_sample(codec->codec_id);
137 if (!codec->codec_id)
138 return AVERROR_INVALIDDATA;
140 /* Block align needs to be computed in all cases, as the definition
141 * is specific to applications -> here we use the WAVE format definition */
142 codec->block_align = (codec->bits_per_sample * codec->channels) >> 3;
144 codec->bit_rate = codec->sample_rate * (codec->block_align << 3);
148 url_fseek(pb, size, SEEK_CUR);
160 static int aiff_write_header(AVFormatContext *s)
162 AIFFOutputContext *aiff = s->priv_data;
163 ByteIOContext *pb = &s->pb;
164 AVCodecContext *enc = s->streams[0]->codec;
165 AVExtFloat sample_rate;
168 /* First verify if format is ok */
169 if (!enc->codec_tag) {
173 if (enc->codec_tag != MKTAG('N','O','N','E'))
176 /* FORM AIFF header */
178 aiff->form = url_ftell(pb);
179 put_be32(pb, 0); /* file length */
180 put_tag(pb, aifc ? "AIFC" : "AIFF");
186 put_be32(pb, 0xA2805140);
191 put_be32(pb, aifc ? 24 : 18); /* size */
192 put_be16(pb, enc->channels); /* Number of channels */
194 aiff->frames = url_ftell(pb);
195 put_be32(pb, 0); /* Number of frames */
197 if (!enc->bits_per_sample)
198 enc->bits_per_sample = av_get_bits_per_sample(enc->codec_id);
199 if (!enc->bits_per_sample) {
200 av_log(s, AV_LOG_ERROR, "could not compute bits per sample\n");
203 if (!enc->block_align)
204 enc->block_align = (enc->bits_per_sample * enc->channels) >> 3;
206 put_be16(pb, enc->bits_per_sample); /* Sample size */
208 sample_rate = av_dbl2ext((double)enc->sample_rate);
209 put_buffer(pb, (uint8_t*)&sample_rate, sizeof(sample_rate));
212 put_le32(pb, enc->codec_tag);
216 /* Sound data chunk */
218 aiff->ssnd = url_ftell(pb); /* Sound chunk size */
219 put_be32(pb, 0); /* Sound samples data size */
220 put_be32(pb, 0); /* Data offset */
221 put_be32(pb, 0); /* Block-size (block align) */
223 av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
225 /* Data is starting here */
226 put_flush_packet(pb);
231 static int aiff_write_packet(AVFormatContext *s, AVPacket *pkt)
233 ByteIOContext *pb = &s->pb;
234 put_buffer(pb, pkt->data, pkt->size);
238 static int aiff_write_trailer(AVFormatContext *s)
240 ByteIOContext *pb = &s->pb;
241 AIFFOutputContext *aiff = s->priv_data;
242 AVCodecContext *enc = s->streams[0]->codec;
244 /* Chunks sizes must be even */
245 offset_t file_size, end_size;
246 end_size = file_size = url_ftell(pb);
252 if (!url_is_streamed(&s->pb)) {
254 url_fseek(pb, aiff->form, SEEK_SET);
255 put_be32(pb, (uint32_t)(file_size - aiff->form - 4));
257 /* Number of sample frames */
258 url_fseek(pb, aiff->frames, SEEK_SET);
259 put_be32(pb, ((uint32_t)(file_size-aiff->ssnd-12))/enc->block_align);
261 /* Sound Data chunk size */
262 url_fseek(pb, aiff->ssnd, SEEK_SET);
263 put_be32(pb, (uint32_t)(file_size - aiff->ssnd - 4));
265 /* return to the end */
266 url_fseek(pb, end_size, SEEK_SET);
268 put_flush_packet(pb);
273 #endif //CONFIG_MUXERS
275 static int aiff_probe(AVProbeData *p)
277 /* check file header */
278 if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
279 p->buf[2] == 'R' && p->buf[3] == 'M' &&
280 p->buf[8] == 'A' && p->buf[9] == 'I' &&
281 p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
282 return AVPROBE_SCORE_MAX;
288 static int aiff_read_header(AVFormatContext *s,
289 AVFormatParameters *ap)
291 int size, filesize, offset;
293 unsigned version = AIFF_C_VERSION1;
294 ByteIOContext *pb = &s->pb;
295 AVStream * st = s->streams[0];
297 /* check FORM header */
298 filesize = get_tag(pb, &tag);
299 if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
300 return AVERROR_INVALIDDATA;
304 if (tag == MKTAG('A', 'I', 'F', 'F')) /* Got an AIFF file */
306 else if (tag != MKTAG('A', 'I', 'F', 'C')) /* An AIFF-C file then */
307 return AVERROR_INVALIDDATA;
311 st = av_new_stream(s, 0);
313 return AVERROR_NOMEM;
315 while (filesize > 0) {
316 /* parse different chunks */
317 size = get_tag(pb, &tag);
321 filesize -= size + 8;
324 case MKTAG('C', 'O', 'M', 'M'): /* Common chunk */
325 /* Then for the complete header info */
326 st->nb_frames = get_aiff_header (pb, st->codec, size, version);
327 if (st->nb_frames < 0)
328 return st->nb_frames;
331 case MKTAG('F', 'V', 'E', 'R'): /* Version chunk */
332 version = get_be32(pb);
335 case MKTAG('N', 'A', 'M', 'E'): /* Sample name chunk */
336 get_meta (pb, s->title, sizeof(s->title), size);
339 case MKTAG('A', 'U', 'T', 'H'): /* Author chunk */
340 get_meta (pb, s->author, sizeof(s->author), size);
343 case MKTAG('(', 'c', ')', ' '): /* Copyright chunk */
344 get_meta (pb, s->copyright, sizeof(s->copyright), size);
347 case MKTAG('A', 'N', 'N', 'O'): /* Annotation chunk */
348 get_meta (pb, s->comment, sizeof(s->comment), size);
351 case MKTAG('S', 'S', 'N', 'D'): /* Sampled sound chunk */
352 get_be32(pb); /* Block align... don't care */
353 offset = get_be32(pb); /* Offset of sound data */
357 if (size & 1) /* Always even aligned */
359 url_fskip (pb, size);
363 /* End of loop and didn't get sound */
364 return AVERROR_INVALIDDATA;
367 /* Now positioned, get the sound data start and end */
369 s->file_size = st->nb_frames * st->codec->block_align;
371 av_set_pts_info(st, 64, 1, st->codec->sample_rate);
373 st->duration = st->nb_frames;
375 /* Position the stream at the first block */
376 url_fskip(pb, offset);
381 #define MAX_SIZE 4096
383 static int aiff_read_packet(AVFormatContext *s,
386 AVStream *st = s->streams[0];
389 /* End of stream may be reached */
390 if (url_feof(&s->pb))
393 /* Now for that packet */
394 res = av_get_packet(&s->pb, pkt, (MAX_SIZE / st->codec->block_align) * st->codec->block_align);
398 /* Only one stream in an AIFF file */
399 pkt->stream_index = 0;
403 static int aiff_read_close(AVFormatContext *s)
408 static int aiff_read_seek(AVFormatContext *s,
409 int stream_index, int64_t timestamp, int flags)
411 return pcm_read_seek(s, stream_index, timestamp, flags);
414 #ifdef CONFIG_AIFF_DEMUXER
415 AVInputFormat aiff_demuxer = {
424 .codec_tag= (const AVCodecTag*[]){codec_aiff_tags, 0},
428 #ifdef CONFIG_AIFF_MUXER
429 AVOutputFormat aiff_muxer = {
434 sizeof(AIFFOutputContext),
440 .codec_tag= (const AVCodecTag*[]){codec_aiff_tags, 0},