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107 lines
3.6 KiB
C
107 lines
3.6 KiB
C
/*
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* Sony OpenMG (OMA) muxer
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*
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* Copyright (c) 2011 Michael Karcher
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include "avio_internal.h"
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#include "id3v2.h"
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#include "internal.h"
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#include "oma.h"
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#include "rawenc.h"
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static av_cold int oma_write_header(AVFormatContext *s)
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{
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int i;
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AVCodecContext *format;
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int srate_index;
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int isjointstereo;
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format = s->streams[0]->codec;
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/* check for support of the format first */
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for (srate_index = 0; ; srate_index++) {
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if (ff_oma_srate_tab[srate_index] == 0) {
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av_log(s, AV_LOG_ERROR, "Sample rate %d not supported in OpenMG audio\n",
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format->sample_rate);
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return AVERROR(EINVAL);
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}
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if (ff_oma_srate_tab[srate_index] * 100 == format->sample_rate)
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break;
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}
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/* 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");
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avio_w8(s->pb, EA3_HEADER_SIZE >> 7);
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avio_w8(s->pb, EA3_HEADER_SIZE & 0x7F);
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avio_wl16(s->pb, 0xFFFF); /* not encrypted */
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for (i = 0; i < 6; i++)
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avio_wl32(s->pb, 0); /* Padding + DRM id */
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switch(format->codec_tag) {
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case OMA_CODECID_ATRAC3:
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if (format->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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}
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if (format->extradata_size == 14) /* WAV format extradata */
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isjointstereo = format->extradata[6] != 0;
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else if(format->extradata_size == 10) /* RM format extradata */
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isjointstereo = format->extradata[8] == 0x12;
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else {
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av_log(s, AV_LOG_ERROR, "ATRAC3: Unsupported extradata size\n");
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return AVERROR(EINVAL);
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}
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avio_wb32(s->pb, (OMA_CODECID_ATRAC3 << 24) |
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(isjointstereo << 17) |
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(srate_index << 13) |
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(format->block_align/8));
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break;
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case OMA_CODECID_ATRAC3P:
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avio_wb32(s->pb, (OMA_CODECID_ATRAC3P << 24) |
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(srate_index << 13) |
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(format->channels << 10) |
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(format->block_align/8 - 1));
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break;
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default:
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av_log(s, AV_LOG_ERROR, "unsupported codec tag %d for write\n",
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format->codec_tag);
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return AVERROR(EINVAL);
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}
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for (i = 0; i < (EA3_HEADER_SIZE - 36)/4; i++)
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avio_wl32(s->pb, 0); /* Padding */
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return 0;
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}
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AVOutputFormat ff_oma_muxer = {
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.name = "oma",
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.long_name = NULL_IF_CONFIG_SMALL("Sony OpenMG audio"),
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.mime_type = "audio/x-oma",
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.extensions = "oma",
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.audio_codec = AV_CODEC_ID_ATRAC3,
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.write_header = oma_write_header,
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.write_packet = ff_raw_write_packet,
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.codec_tag = (const AVCodecTag* const []){ff_oma_codec_tags, 0},
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};
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