1/* 2 * Sony OpenMG (OMA) muxer 3 * 4 * Copyright (c) 2011 Michael Karcher 5 * 6 * This file is part of Libav. 7 * 8 * Libav is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public 10 * License as published by the Free Software Foundation; either 11 * version 2.1 of the License, or (at your option) any later version. 12 * 13 * Libav is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with Libav; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21 */ 22 23#include "avformat.h" 24#include "avio_internal.h" 25#include "id3v2.h" 26#include "internal.h" 27#include "oma.h" 28#include "rawenc.h" 29 30static av_cold int oma_write_header(AVFormatContext *s) 31{ 32 int i; 33 AVCodecContext *format; 34 int srate_index; 35 int isjointstereo; 36 37 format = s->streams[0]->codec; 38 /* check for support of the format first */ 39 40 for (srate_index = 0; ; srate_index++) { 41 if (ff_oma_srate_tab[srate_index] == 0) { 42 av_log(s, AV_LOG_ERROR, "Sample rate %d not supported in OpenMG audio\n", 43 format->sample_rate); 44 return AVERROR(EINVAL); 45 } 46 47 if (ff_oma_srate_tab[srate_index] * 100 == format->sample_rate) 48 break; 49 } 50 51 /* Metadata; OpenMG does not support ID3v2.4 */ 52 ff_id3v2_write(s, 3, ID3v2_EA3_MAGIC); 53 54 ffio_wfourcc(s->pb, "EA3\0"); 55 avio_w8(s->pb, EA3_HEADER_SIZE >> 7); 56 avio_w8(s->pb, EA3_HEADER_SIZE & 0x7F); 57 avio_wl16(s->pb, 0xFFFF); /* not encrypted */ 58 for (i = 0; i < 6; i++) 59 avio_wl32(s->pb, 0); /* Padding + DRM id */ 60 61 switch(format->codec_tag) { 62 case OMA_CODECID_ATRAC3: 63 if (format->channels != 2) { 64 av_log(s, AV_LOG_ERROR, "ATRAC3 in OMA is only supported with 2 channels"); 65 return AVERROR(EINVAL); 66 } 67 if (format->extradata_size == 14) /* WAV format extradata */ 68 isjointstereo = format->extradata[6] != 0; 69 else if(format->extradata_size == 10) /* RM format extradata */ 70 isjointstereo = format->extradata[8] == 0x12; 71 else { 72 av_log(s, AV_LOG_ERROR, "ATRAC3: Unsupported extradata size\n"); 73 return AVERROR(EINVAL); 74 } 75 avio_wb32(s->pb, (OMA_CODECID_ATRAC3 << 24) | 76 (isjointstereo << 17) | 77 (srate_index << 13) | 78 (format->block_align/8)); 79 break; 80 case OMA_CODECID_ATRAC3P: 81 avio_wb32(s->pb, (OMA_CODECID_ATRAC3P << 24) | 82 (srate_index << 13) | 83 (format->channels << 10) | 84 (format->block_align/8 - 1)); 85 break; 86 default: 87 av_log(s, AV_LOG_ERROR, "OMA: unsupported codec tag %d for write\n", 88 format->codec_tag); 89 } 90 for (i = 0; i < (EA3_HEADER_SIZE - 36)/4; i++) 91 avio_wl32(s->pb, 0); /* Padding */ 92 93 return 0; 94} 95 96AVOutputFormat ff_oma_muxer = { 97 .name = "oma", 98 .long_name = NULL_IF_CONFIG_SMALL("Sony OpenMG audio"), 99 .mime_type = "audio/x-oma", 100 .extensions = "oma", 101 .audio_codec = CODEC_ID_ATRAC3, 102 .write_header = oma_write_header, 103 .write_packet = ff_raw_write_packet, 104 .codec_tag = (const AVCodecTag* const []){ff_oma_codec_tags, 0}, 105}; 106