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107 lines
3.7 KiB
107 lines
3.7 KiB
/* |
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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 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 |
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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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* 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 |
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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 FFmpeg; 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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.flags = AVFMT_NOTIMESTAMPS, |
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};
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