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ffmpeg/libavformat/au.c

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/*
* AU muxer and demuxer
* Copyright (c) 2001 Fabrice Bellard
*
* first version by Francois Revol <revol@free.fr>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* Reference documents:
* http://www.opengroup.org/public/pubs/external/auformat.html
* http://www.goice.co.jp/member/mo/formats/au.html
*/
#include "avformat.h"
#include "internal.h"
#include "avio_internal.h"
#include "pcm.h"
#include "libavutil/avassert.h"
/* if we don't know the size in advance */
#define AU_UNKNOWN_SIZE ((uint32_t)(~0))
/* the specification requires an annotation field of at least eight bytes */
#define AU_HEADER_SIZE (24+8)
static const AVCodecTag codec_au_tags[] = {
{ AV_CODEC_ID_PCM_MULAW, 1 },
{ AV_CODEC_ID_PCM_S8, 2 },
{ AV_CODEC_ID_PCM_S16BE, 3 },
{ AV_CODEC_ID_PCM_S24BE, 4 },
{ AV_CODEC_ID_PCM_S32BE, 5 },
{ AV_CODEC_ID_PCM_F32BE, 6 },
{ AV_CODEC_ID_PCM_F64BE, 7 },
{ AV_CODEC_ID_ADPCM_G726LE, 23 },
{ AV_CODEC_ID_ADPCM_G722,24 },
{ AV_CODEC_ID_ADPCM_G726LE, 25 },
{ AV_CODEC_ID_ADPCM_G726LE, 26 },
{ AV_CODEC_ID_PCM_ALAW, 27 },
{ AV_CODEC_ID_ADPCM_G726LE, MKBETAG('7','2','6','2') },
{ AV_CODEC_ID_NONE, 0 },
};
#if CONFIG_AU_DEMUXER
static int au_probe(AVProbeData *p)
{
if (p->buf[0] == '.' && p->buf[1] == 's' &&
p->buf[2] == 'n' && p->buf[3] == 'd')
return AVPROBE_SCORE_MAX;
else
return 0;
}
#define BLOCK_SIZE 1024
static int au_read_header(AVFormatContext *s)
{
int size, data_size = 0;
unsigned int tag;
AVIOContext *pb = s->pb;
unsigned int id, channels, rate;
int bps;
enum AVCodecID codec;
AVStream *st;
tag = avio_rl32(pb);
if (tag != MKTAG('.', 's', 'n', 'd'))
return AVERROR_INVALIDDATA;
size = avio_rb32(pb); /* header size */
data_size = avio_rb32(pb); /* data size in bytes */
if (data_size < 0 && data_size != AU_UNKNOWN_SIZE) {
av_log(s, AV_LOG_ERROR, "Invalid negative data size '%d' found\n", data_size);
return AVERROR_INVALIDDATA;
}
id = avio_rb32(pb);
rate = avio_rb32(pb);
channels = avio_rb32(pb);
if (size > 24) {
/* skip unused data */
avio_skip(pb, size - 24);
}
codec = ff_codec_get_id(codec_au_tags, id);
if (codec == AV_CODEC_ID_NONE) {
avpriv_request_sample(s, "unknown or unsupported codec tag: %u", id);
return AVERROR_PATCHWELCOME;
}
bps = av_get_bits_per_sample(codec);
if (codec == AV_CODEC_ID_ADPCM_G726LE) {
if (id == MKBETAG('7','2','6','2')) {
bps = 2;
} else {
const uint8_t bpcss[] = {4, 0, 3, 5};
av_assert0(id >= 23 && id < 23 + 4);
bps = bpcss[id - 23];
}
} else if (!bps) {
avpriv_request_sample(s, "Unknown bits per sample");
return AVERROR_PATCHWELCOME;
}
if (channels == 0 || channels >= INT_MAX / (BLOCK_SIZE * bps >> 3)) {
av_log(s, AV_LOG_ERROR, "Invalid number of channels %u\n", channels);
return AVERROR_INVALIDDATA;
}
if (rate == 0 || rate > INT_MAX) {
av_log(s, AV_LOG_ERROR, "Invalid sample rate: %u\n", rate);
return AVERROR_INVALIDDATA;
}
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->codec_tag = id;
st->codec->codec_id = codec;
st->codec->channels = channels;
st->codec->sample_rate = rate;
st->codec->bits_per_coded_sample = bps;
st->codec->bit_rate = channels * rate * bps;
st->codec->block_align = FFMAX(bps * st->codec->channels / 8, 1);
if (data_size != AU_UNKNOWN_SIZE)
st->duration = (((int64_t)data_size)<<3) / (st->codec->channels * (int64_t)bps);
st->start_time = 0;
avpriv_set_pts_info(st, 64, 1, rate);
return 0;
}
AVInputFormat ff_au_demuxer = {
.name = "au",
.long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
.read_probe = au_probe,
.read_header = au_read_header,
.read_packet = ff_pcm_read_packet,
.read_seek = ff_pcm_read_seek,
.codec_tag = (const AVCodecTag* const []) { codec_au_tags, 0 },
};
#endif /* CONFIG_AU_DEMUXER */
#if CONFIG_AU_MUXER
#include "rawenc.h"
static int au_write_header(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
AVCodecContext *enc = s->streams[0]->codec;
if (s->nb_streams != 1) {
av_log(s, AV_LOG_ERROR, "only one stream is supported\n");
return AVERROR(EINVAL);
}
enc->codec_tag = ff_codec_get_tag(codec_au_tags, enc->codec_id);
if (!enc->codec_tag) {
av_log(s, AV_LOG_ERROR, "unsupported codec\n");
return AVERROR(EINVAL);
}
ffio_wfourcc(pb, ".snd"); /* magic number */
avio_wb32(pb, AU_HEADER_SIZE); /* header size */
avio_wb32(pb, AU_UNKNOWN_SIZE); /* data size */
avio_wb32(pb, enc->codec_tag); /* codec ID */
avio_wb32(pb, enc->sample_rate);
avio_wb32(pb, enc->channels);
avio_wb64(pb, 0); /* annotation field */
avio_flush(pb);
return 0;
}
static int au_write_trailer(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
int64_t file_size = avio_tell(pb);
if (s->pb->seekable && file_size < INT32_MAX) {
/* update file size */
avio_seek(pb, 8, SEEK_SET);
avio_wb32(pb, (uint32_t)(file_size - AU_HEADER_SIZE));
avio_seek(pb, file_size, SEEK_SET);
avio_flush(pb);
}
return 0;
}
AVOutputFormat ff_au_muxer = {
.name = "au",
.long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
.mime_type = "audio/basic",
.extensions = "au",
.audio_codec = AV_CODEC_ID_PCM_S16BE,
.video_codec = AV_CODEC_ID_NONE,
.write_header = au_write_header,
.write_packet = ff_raw_write_packet,
.write_trailer = au_write_trailer,
.codec_tag = (const AVCodecTag* const []) { codec_au_tags, 0 },
.flags = AVFMT_NOTIMESTAMPS,
};
#endif /* CONFIG_AU_MUXER */
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