• Main Page
  • Related Pages
  • Modules
  • Data Structures
  • Files
  • File List
  • Globals

libavformat/daud.c

Go to the documentation of this file.
00001 /*
00002  * D-Cinema audio demuxer
00003  * Copyright (c) 2005 Reimar Döffinger
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 #include "avformat.h"
00022 
00023 static int daud_header(AVFormatContext *s, AVFormatParameters *ap) {
00024     AVStream *st = av_new_stream(s, 0);
00025     if (!st)
00026         return AVERROR(ENOMEM);
00027     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00028     st->codec->codec_id = CODEC_ID_PCM_S24DAUD;
00029     st->codec->codec_tag = MKTAG('d', 'a', 'u', 'd');
00030     st->codec->channels = 6;
00031     st->codec->sample_rate = 96000;
00032     st->codec->bit_rate = 3 * 6 * 96000 * 8;
00033     st->codec->block_align = 3 * 6;
00034     st->codec->bits_per_coded_sample = 24;
00035     return 0;
00036 }
00037 
00038 static int daud_packet(AVFormatContext *s, AVPacket *pkt) {
00039     ByteIOContext *pb = s->pb;
00040     int ret, size;
00041     if (url_feof(pb))
00042         return AVERROR(EIO);
00043     size = get_be16(pb);
00044     get_be16(pb); // unknown
00045     ret = av_get_packet(pb, pkt, size);
00046     pkt->stream_index = 0;
00047     return ret;
00048 }
00049 
00050 static int daud_write_header(struct AVFormatContext *s)
00051 {
00052     AVCodecContext *codec = s->streams[0]->codec;
00053     if (codec->channels!=6 || codec->sample_rate!=96000)
00054         return -1;
00055     return 0;
00056 }
00057 
00058 static int daud_write_packet(struct AVFormatContext *s, AVPacket *pkt)
00059 {
00060     put_be16(s->pb, pkt->size);
00061     put_be16(s->pb, 0x8010); // unknown
00062     put_buffer(s->pb, pkt->data, pkt->size);
00063     put_flush_packet(s->pb);
00064     return 0;
00065 }
00066 
00067 #if CONFIG_DAUD_DEMUXER
00068 AVInputFormat daud_demuxer = {
00069     "daud",
00070     NULL_IF_CONFIG_SMALL("D-Cinema audio format"),
00071     0,
00072     NULL,
00073     daud_header,
00074     daud_packet,
00075     NULL,
00076     NULL,
00077     .extensions = "302",
00078 };
00079 #endif
00080 
00081 #if CONFIG_DAUD_MUXER
00082 AVOutputFormat daud_muxer =
00083 {
00084     "daud",
00085     NULL_IF_CONFIG_SMALL("D-Cinema audio format"),
00086     NULL,
00087     "302",
00088     0,
00089     CODEC_ID_PCM_S24DAUD,
00090     CODEC_ID_NONE,
00091     daud_write_header,
00092     daud_write_packet,
00093     .flags= AVFMT_NOTIMESTAMPS,
00094 };
00095 #endif

Generated on Fri Sep 16 2011 17:17:48 for FFmpeg by  doxygen 1.7.1