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/*
* Sony OpenMG (OMA) muxer
*
* Copyright (c) 2011 Michael Karcher
* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* 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.
* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* 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 |
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* License along with FFmpeg; if not, write to the Free Software |
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* 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; |
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AVCodecParameters *par; |
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int srate_index;
int isjointstereo;
|
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par = s->streams[0]->codecpar; |
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/* 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", |
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par->sample_rate); |
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return AVERROR(EINVAL);
}
|
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if (ff_oma_srate_tab[srate_index] * 100 == par->sample_rate) |
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break;
}
/* Metadata; OpenMG does not support ID3v2.4 */ |
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ff_id3v2_write_simple(s, 3, ID3v2_EA3_MAGIC); |
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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 */
|
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switch (par->codec_tag) { |
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case OMA_CODECID_ATRAC3: |
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if (par->channels != 2) { |
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av_log(s, AV_LOG_ERROR, "ATRAC3 in OMA is only supported with 2 channels\n"); |
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return AVERROR(EINVAL);
} |
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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; |
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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) | |
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(par->block_align/8)); |
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break;
case OMA_CODECID_ATRAC3P:
avio_wb32(s->pb, (OMA_CODECID_ATRAC3P << 24) |
(srate_index << 13) | |
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(par->channels << 10) |
(par->block_align/8 - 1)); |
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break;
default: |
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av_log(s, AV_LOG_ERROR, "unsupported codec tag %s for write\n",
av_fourcc2str(par->codec_tag)); |
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return AVERROR(EINVAL); |
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}
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", |
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.audio_codec = AV_CODEC_ID_ATRAC3, |
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.write_header = oma_write_header,
.write_packet = ff_raw_write_packet,
.codec_tag = (const AVCodecTag* const []){ff_oma_codec_tags, 0}, |
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.flags = AVFMT_NOTIMESTAMPS, |
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}; |