aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* Sony OpenMG (OMA) muxer
*
* Copyright (c) 2011 Michael Karcher
*
* 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 "avformat.h"
#include "avio_internal.h"
#include "id3v2.h"
#include "internal.h"
#include "oma.h"
#include "rawenc.h"
static av_cold int oma_write_header(AVFormatContext *s)
{
int i;
AVCodecParameters *par;
int srate_index;
int isjointstereo;
par = s->streams[0]->codecpar;
/* check for support of the format first */
for (srate_index = 0; ; srate_index++) {
if (ff_oma_srate_tab[srate_index] == 0) {
av_log(s, AV_LOG_ERROR, "Sample rate %d not supported in OpenMG audio\n",
par->sample_rate);
return AVERROR(EINVAL);
}
if (ff_oma_srate_tab[srate_index] * 100 == par->sample_rate)
break;
}
/* Metadata; OpenMG does not support ID3v2.4 */
ff_id3v2_write_simple(s, 3, ID3v2_EA3_MAGIC);
ffio_wfourcc(s->pb, "EA3\0");
avio_w8(s->pb, EA3_HEADER_SIZE >> 7);
avio_w8(s->pb, EA3_HEADER_SIZE & 0x7F);
avio_wl16(s->pb, 0xFFFF); /* not encrypted */
for (i = 0; i < 6; i++)
avio_wl32(s->pb, 0); /* Padding + DRM id */
switch (par->codec_tag) {
case OMA_CODECID_ATRAC3:
if (par->channels != 2) {
av_log(s, AV_LOG_ERROR, "ATRAC3 in OMA is only supported with 2 channels\n");
return AVERROR(EINVAL);
}
if (par->extradata_size == 14) /* WAV format extradata */
isjointstereo = par->extradata[6] != 0;
else if(par->extradata_size == 10) /* RM format extradata */
isjointstereo = par->extradata[8] == 0x12;
else {
av_log(s, AV_LOG_ERROR, "ATRAC3: Unsupported extradata size\n");
return AVERROR(EINVAL);
}
avio_wb32(s->pb, (OMA_CODECID_ATRAC3 << 24) |
(isjointstereo << 17) |
(srate_index << 13) |
(par->block_align/8));
break;
case OMA_CODECID_ATRAC3P:
avio_wb32(s->pb, (OMA_CODECID_ATRAC3P << 24) |
(srate_index << 13) |
(par->channels << 10) |
(par->block_align/8 - 1));
break;
default:
av_log(s, AV_LOG_ERROR, "unsupported codec tag %s for write\n",
av_fourcc2str(par->codec_tag));
return AVERROR(EINVAL);
}
for (i = 0; i < (EA3_HEADER_SIZE - 36)/4; i++)
avio_wl32(s->pb, 0); /* Padding */
return 0;
}
AVOutputFormat ff_oma_muxer = {
.name = "oma",
.long_name = NULL_IF_CONFIG_SMALL("Sony OpenMG audio"),
.mime_type = "audio/x-oma",
.extensions = "oma",
.audio_codec = AV_CODEC_ID_ATRAC3,
.write_header = oma_write_header,
.write_packet = ff_raw_write_packet,
.codec_tag = (const AVCodecTag* const []){ff_oma_codec_tags, 0},
.flags = AVFMT_NOTIMESTAMPS,
};
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