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105 lines
3.1 KiB
105 lines
3.1 KiB
/* |
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* MD STUDIO audio demuxer |
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* |
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* Copyright (c) 2009 Benjamin Larsson |
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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 "libavutil/channel_layout.h" |
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#include "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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#include "pcm.h" |
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#define AT1_SU_SIZE 212 |
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static int aea_read_probe(AVProbeData *p) |
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{ |
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if (p->buf_size <= 2048+212) |
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return 0; |
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/* Magic is '00 08 00 00' in Little Endian*/ |
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if (AV_RL32(p->buf)==0x800) { |
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int bsm_s, bsm_e, inb_s, inb_e, ch; |
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ch = p->buf[264]; |
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bsm_s = p->buf[2048]; |
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inb_s = p->buf[2048+1]; |
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inb_e = p->buf[2048+210]; |
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bsm_e = p->buf[2048+211]; |
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if (ch != 1 && ch != 2) |
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return 0; |
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/* Check so that the redundant bsm bytes and info bytes are valid |
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* the block size mode bytes have to be the same |
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* the info bytes have to be the same |
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*/ |
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if (bsm_s == bsm_e && inb_s == inb_e) |
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return AVPROBE_SCORE_MAX / 4 + 1; |
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} |
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return 0; |
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} |
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static int aea_read_header(AVFormatContext *s) |
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{ |
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AVStream *st = avformat_new_stream(s, NULL); |
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if (!st) |
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return AVERROR(ENOMEM); |
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/* Parse the amount of channels and skip to pos 2048(0x800) */ |
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avio_skip(s->pb, 264); |
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st->codec->channels = avio_r8(s->pb); |
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avio_skip(s->pb, 1783); |
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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st->codec->codec_id = AV_CODEC_ID_ATRAC1; |
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st->codec->sample_rate = 44100; |
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st->codec->bit_rate = 292000; |
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if (st->codec->channels != 1 && st->codec->channels != 2) { |
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av_log(s,AV_LOG_ERROR,"Channels %d not supported!\n",st->codec->channels); |
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return -1; |
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} |
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st->codec->channel_layout = (st->codec->channels == 1) ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO; |
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st->codec->block_align = AT1_SU_SIZE * st->codec->channels; |
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return 0; |
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} |
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static int aea_read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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int ret = av_get_packet(s->pb, pkt, s->streams[0]->codec->block_align); |
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pkt->stream_index = 0; |
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if (ret <= 0) |
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return AVERROR(EIO); |
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return ret; |
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} |
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AVInputFormat ff_aea_demuxer = { |
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.name = "aea", |
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.long_name = NULL_IF_CONFIG_SMALL("MD STUDIO audio"), |
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.read_probe = aea_read_probe, |
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.read_header = aea_read_header, |
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.read_packet = aea_read_packet, |
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.read_seek = ff_pcm_read_seek, |
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.flags = AVFMT_GENERIC_INDEX, |
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.extensions = "aea", |
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};
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