2 * AIFF/AIFF-C encoder and decoder
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 const CodecTag 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 bits per second */
99 static int fix_bps(int codec_id)
102 case CODEC_ID_PCM_S8:
104 case CODEC_ID_PCM_S16BE:
106 case CODEC_ID_PCM_S24BE:
108 case CODEC_ID_PCM_S32BE:
115 /* Returns the number of sound data frames or negative on error */
116 static unsigned int get_aiff_header(ByteIOContext *pb, AVCodecContext *codec,
117 int size, unsigned version)
121 unsigned int num_frames;
127 codec->codec_type = CODEC_TYPE_AUDIO;
128 codec->channels = get_be16(pb);
129 num_frames = get_be32(pb);
130 codec->bits_per_sample = get_be16(pb);
132 get_buffer(pb, (uint8_t*)&ext, sizeof(ext));/* Sample rate is in */
133 sample_rate = av_ext2dbl(ext); /* 80 bits BE IEEE extended float */
134 codec->sample_rate = sample_rate;
138 if (version == AIFF_C_VERSION1) {
139 codec->codec_tag = get_le32(pb);
140 codec->codec_id = codec_get_id (codec_aiff_tags, codec->codec_tag);
142 if (codec->codec_id == CODEC_ID_PCM_S16BE) {
143 codec->codec_id = aiff_codec_get_id (codec->bits_per_sample);
144 codec->bits_per_sample = fix_bps(codec->codec_id);
149 /* Need the codec type */
150 codec->codec_id = aiff_codec_get_id (codec->bits_per_sample);
151 codec->bits_per_sample = fix_bps(codec->codec_id);
154 if (!codec->codec_id)
155 return AVERROR_INVALIDDATA;
157 /* Block align needs to be computed in all cases, as the definition
158 * is specific to applications -> here we use the WAVE format definition */
159 codec->block_align = (codec->bits_per_sample * codec->channels) >> 3;
161 codec->bit_rate = codec->sample_rate * codec->block_align;
165 url_fseek(pb, size, SEEK_CUR);
177 static int aiff_write_header(AVFormatContext *s)
179 AIFFOutputContext *aiff = s->priv_data;
180 ByteIOContext *pb = &s->pb;
181 AVCodecContext *enc = s->streams[0]->codec;
182 AVExtFloat sample_rate;
184 /* First verify if format is ok */
185 enc->codec_tag = codec_get_tag(codec_aiff_tags, enc->codec_id);
186 if (!enc->codec_tag) {
191 /* FORM AIFF header */
193 aiff->form = url_ftell(pb);
194 put_be32(pb, 0); /* file length */
200 put_be32(pb, 0xA2805140);
204 put_be32(pb, 24); /* size */
205 put_be16(pb, enc->channels); /* Number of channels */
207 aiff->frames = url_ftell(pb);
208 put_be32(pb, 0); /* Number of frames */
210 if (!enc->bits_per_sample)
211 enc->bits_per_sample = (enc->block_align<<3) / enc->channels;
212 put_be16(pb, enc->bits_per_sample); /* Sample size */
214 sample_rate = av_dbl2ext((double)enc->sample_rate);
215 put_buffer(pb, (uint8_t*)&sample_rate, sizeof(sample_rate));
217 put_le32(pb, enc->codec_tag);
220 /* Sound data chunk */
222 aiff->ssnd = url_ftell(pb); /* Sound chunk size */
223 put_be32(pb, 0); /* Sound samples data size */
224 put_be32(pb, 0); /* Data offset */
225 put_be32(pb, 0); /* Block-size (block align) */
227 av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
229 /* Data is starting here */
230 put_flush_packet(pb);
235 static int aiff_write_packet(AVFormatContext *s, AVPacket *pkt)
237 ByteIOContext *pb = &s->pb;
238 put_buffer(pb, pkt->data, pkt->size);
242 static int aiff_write_trailer(AVFormatContext *s)
244 ByteIOContext *pb = &s->pb;
245 AIFFOutputContext *aiff = s->priv_data;
246 AVCodecContext *enc = s->streams[0]->codec;
248 /* Chunks sizes must be even */
249 offset_t file_size, end_size;
250 end_size = file_size = url_ftell(pb);
256 if (!url_is_streamed(&s->pb)) {
258 url_fseek(pb, aiff->form, SEEK_SET);
259 put_be32(pb, (uint32_t)(file_size - aiff->form - 4));
261 /* Number of sample frames */
262 url_fseek(pb, aiff->frames, SEEK_SET);
263 put_be32(pb, ((uint32_t)(file_size-aiff->ssnd-12))/enc->block_align);
265 /* Sound Data chunk size */
266 url_fseek(pb, aiff->ssnd, SEEK_SET);
267 put_be32(pb, (uint32_t)(file_size - aiff->ssnd - 4));
269 /* return to the end */
270 url_fseek(pb, end_size, SEEK_SET);
272 put_flush_packet(pb);
277 #endif //CONFIG_MUXERS
279 static int aiff_probe(AVProbeData *p)
281 /* check file header */
282 if (p->buf_size < 16)
284 if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
285 p->buf[2] == 'R' && p->buf[3] == 'M' &&
286 p->buf[8] == 'A' && p->buf[9] == 'I' &&
287 p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
288 return AVPROBE_SCORE_MAX;
294 static int aiff_read_header(AVFormatContext *s,
295 AVFormatParameters *ap)
297 int size, filesize, offset;
299 unsigned version = AIFF_C_VERSION1;
300 ByteIOContext *pb = &s->pb;
301 AVStream * st = s->streams[0];
303 /* check FORM header */
304 filesize = get_tag(pb, &tag);
305 if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
306 return AVERROR_INVALIDDATA;
310 if (tag == MKTAG('A', 'I', 'F', 'F')) /* Got an AIFF file */
312 else if (tag != MKTAG('A', 'I', 'F', 'C')) /* An AIFF-C file then */
313 return AVERROR_INVALIDDATA;
317 st = av_new_stream(s, 0);
319 return AVERROR_NOMEM;
321 while (filesize > 0) {
322 /* parse different chunks */
323 size = get_tag(pb, &tag);
327 filesize -= size + 8;
330 case MKTAG('C', 'O', 'M', 'M'): /* Common chunk */
331 /* Then for the complete header info */
332 st->nb_frames = get_aiff_header (pb, st->codec, size, version);
333 if (st->nb_frames < 0)
334 return st->nb_frames;
337 case MKTAG('F', 'V', 'E', 'R'): /* Version chunk */
338 version = get_be32(pb);
341 case MKTAG('N', 'A', 'M', 'E'): /* Sample name chunk */
342 get_meta (pb, s->title, sizeof(s->title), size);
345 case MKTAG('A', 'U', 'T', 'H'): /* Author chunk */
346 get_meta (pb, s->author, sizeof(s->author), size);
349 case MKTAG('(', 'c', ')', ' '): /* Copyright chunk */
350 get_meta (pb, s->copyright, sizeof(s->copyright), size);
353 case MKTAG('A', 'N', 'N', 'O'): /* Annotation chunk */
354 get_meta (pb, s->comment, sizeof(s->comment), size);
357 case MKTAG('S', 'S', 'N', 'D'): /* Sampled sound chunk */
358 get_be32(pb); /* Block align... don't care */
359 offset = get_be32(pb); /* Offset of sound data */
363 if (size & 1) /* Always even aligned */
365 url_fskip (pb, size);
369 /* End of loop and didn't get sound */
370 return AVERROR_INVALIDDATA;
373 /* Now positioned, get the sound data start and end */
375 s->file_size = st->nb_frames * st->codec->block_align;
377 av_set_pts_info(st, 64, 1, st->codec->sample_rate);
379 st->duration = st->nb_frames;
381 /* Position the stream at the first block */
382 url_fskip(pb, offset);
387 #define MAX_SIZE 4096
389 static int aiff_read_packet(AVFormatContext *s,
392 AVStream *st = s->streams[0];
395 /* End of stream may be reached */
396 if (url_feof(&s->pb))
399 /* Now for that packet */
400 res = av_get_packet(&s->pb, pkt, (MAX_SIZE / st->codec->block_align) * st->codec->block_align);
404 /* Only one stream in an AIFF file */
405 pkt->stream_index = 0;
409 static int aiff_read_close(AVFormatContext *s)
414 static int aiff_read_seek(AVFormatContext *s,
415 int stream_index, int64_t timestamp, int flags)
417 return pcm_read_seek(s, stream_index, timestamp, flags);
420 #ifdef CONFIG_AIFF_DEMUXER
421 AVInputFormat aiff_demuxer = {
433 #ifdef CONFIG_AIFF_MUXER
434 AVOutputFormat aiff_muxer = {
439 sizeof(AIFFOutputContext),