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/*
* SoX native format demuxer
* Copyright (c) 2009 Daniel Verkamp <daniel@drv.nu>
*
* Based on libSoX sox-fmt.c
* Copyright (c) 2008 robs@users.sourceforge.net
*
* 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
*/
/**
* SoX native format demuxer
* @file
* @author Daniel Verkamp
* @sa http://wiki.multimedia.cx/index.php?title=SoX_native_intermediate_format
*/
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "pcm.h"
#include "sox.h"
static int sox_probe(AVProbeData *p)
{
if (AV_RL32(p->buf) == SOX_TAG || AV_RB32(p->buf) == SOX_TAG)
return AVPROBE_SCORE_MAX;
return 0;
}
static int sox_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
AVIOContext *pb = s->pb;
unsigned header_size, comment_size;
double sample_rate, sample_rate_frac;
AVStream *st;
st = av_new_stream(s, 0);
if (!st)
return AVERROR(ENOMEM);
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
if (avio_rl32(pb) == SOX_TAG) {
st->codec->codec_id = CODEC_ID_PCM_S32LE;
header_size = avio_rl32(pb);
avio_seek(pb, 8, SEEK_CUR); /* sample count */
sample_rate = av_int2dbl(avio_rl64(pb));
st->codec->channels = avio_rl32(pb);
comment_size = avio_rl32(pb);
} else {
st->codec->codec_id = CODEC_ID_PCM_S32BE;
header_size = avio_rb32(pb);
avio_seek(pb, 8, SEEK_CUR); /* sample count */
sample_rate = av_int2dbl(avio_rb64(pb));
st->codec->channels = avio_rb32(pb);
comment_size = avio_rb32(pb);
}
if (comment_size > 0xFFFFFFFFU - SOX_FIXED_HDR - 4U) {
av_log(s, AV_LOG_ERROR, "invalid comment size (%u)\n", comment_size);
return -1;
}
if (sample_rate <= 0 || sample_rate > INT_MAX) {
av_log(s, AV_LOG_ERROR, "invalid sample rate (%f)\n", sample_rate);
return -1;
}
sample_rate_frac = sample_rate - floor(sample_rate);
if (sample_rate_frac)
av_log(s, AV_LOG_WARNING,
"truncating fractional part of sample rate (%f)\n",
sample_rate_frac);
if ((header_size + 4) & 7 || header_size < SOX_FIXED_HDR + comment_size
|| st->codec->channels > 65535) /* Reserve top 16 bits */ {
av_log(s, AV_LOG_ERROR, "invalid header\n");
return -1;
}
if (comment_size && comment_size < UINT_MAX) {
char *comment = av_malloc(comment_size+1);
if (avio_read(pb, comment, comment_size) != comment_size) {
av_freep(&comment);
return AVERROR(EIO);
}
comment[comment_size] = 0;
av_metadata_set2(&s->metadata, "comment", comment,
AV_METADATA_DONT_STRDUP_VAL);
}
avio_seek(pb, header_size - SOX_FIXED_HDR - comment_size, SEEK_CUR);
st->codec->sample_rate = sample_rate;
st->codec->bits_per_coded_sample = 32;
st->codec->bit_rate = st->codec->sample_rate *
st->codec->bits_per_coded_sample *
st->codec->channels;
st->codec->block_align = st->codec->bits_per_coded_sample *
st->codec->channels / 8;
av_set_pts_info(st, 64, 1, st->codec->sample_rate);
return 0;
}
#define SOX_SAMPLES 1024
static int sox_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
int ret, size;
if (url_feof(s->pb))
return AVERROR_EOF;
size = SOX_SAMPLES*s->streams[0]->codec->block_align;
ret = av_get_packet(s->pb, pkt, size);
if (ret < 0)
return AVERROR(EIO);
pkt->stream_index = 0;
pkt->size = ret;
return 0;
}
AVInputFormat ff_sox_demuxer = {
"sox",
NULL_IF_CONFIG_SMALL("SoX native format"),
0,
sox_probe,
sox_read_header,
sox_read_packet,
NULL,
pcm_read_seek,
};
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