aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* IRCAM demuxer
* Copyright (c) 2012 Paul B Mahol
*
* 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
*/
#include "libavutil/intreadwrite.h"
#include "libavcodec/internal.h"
#include "avformat.h"
#include "internal.h"
#include "pcm.h"
#include "ircam.h"
static int ircam_probe(const AVProbeData *p)
{
if ((p->buf[0] == 0x64 && p->buf[1] == 0xA3 && p->buf[3] == 0x00 &&
p->buf[2] >= 1 && p->buf[2] <= 4) ||
(p->buf[3] == 0x64 && p->buf[2] == 0xA3 && p->buf[0] == 0x00 &&
p->buf[1] >= 1 && p->buf[1] <= 3) &&
AV_RN32(p->buf + 4) && AV_RN32(p->buf + 8))
return AVPROBE_SCORE_MAX / 4 * 3;
return 0;
}
static const struct endianess {
uint32_t magic;
int is_le;
} table[] = {
{ 0x64A30100, 0 },
{ 0x64A30200, 1 },
{ 0x64A30300, 0 },
{ 0x64A30400, 1 },
{ 0x0001A364, 1 },
{ 0x0002A364, 0 },
{ 0x0003A364, 1 },
};
static int ircam_read_header(AVFormatContext *s)
{
uint32_t magic, sample_rate, channels, tag;
const AVCodecTag *tags;
int le = -1, i;
AVStream *st;
magic = avio_rl32(s->pb);
for (i = 0; i < 7; i++) {
if (magic == table[i].magic) {
le = table[i].is_le;
break;
}
}
if (le == 1) {
sample_rate = av_int2float(avio_rl32(s->pb));
channels = avio_rl32(s->pb);
tag = avio_rl32(s->pb);
tags = ff_codec_ircam_le_tags;
} else if (le == 0) {
sample_rate = av_int2float(avio_rb32(s->pb));
channels = avio_rb32(s->pb);
tag = avio_rb32(s->pb);
tags = ff_codec_ircam_be_tags;
} else {
return AVERROR_INVALIDDATA;
}
if (!channels || !sample_rate)
return AVERROR_INVALIDDATA;
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->channels = channels;
if (st->codecpar->channels > FF_SANE_NB_CHANNELS)
return AVERROR(ENOSYS);
st->codecpar->sample_rate = sample_rate;
st->codecpar->codec_id = ff_codec_get_id(tags, tag);
if (st->codecpar->codec_id == AV_CODEC_ID_NONE) {
av_log(s, AV_LOG_ERROR, "unknown tag %"PRIx32"\n", tag);
return AVERROR_INVALIDDATA;
}
st->codecpar->bits_per_coded_sample = av_get_bits_per_sample(st->codecpar->codec_id);
st->codecpar->block_align = st->codecpar->bits_per_coded_sample * st->codecpar->channels / 8;
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
avio_skip(s->pb, 1008);
return 0;
}
AVInputFormat ff_ircam_demuxer = {
.name = "ircam",
.long_name = NULL_IF_CONFIG_SMALL("Berkeley/IRCAM/CARL Sound Format"),
.read_probe = ircam_probe,
.read_header = ircam_read_header,
.read_packet = ff_pcm_read_packet,
.read_seek = ff_pcm_read_seek,
.extensions = "sf,ircam",
.flags = AVFMT_GENERIC_INDEX,
};
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