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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * MD STUDIO audio demuxer |
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| 3 | * |
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| 4 | * Copyright (c) 2009 Benjamin Larsson |
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| 5 | * |
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| 6 | * This file is part of FFmpeg. |
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| 7 | * |
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| 8 | * FFmpeg is free software; you can redistribute it and/or |
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| 9 | * modify it under the terms of the GNU Lesser General Public |
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| 10 | * License as published by the Free Software Foundation; either |
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| 11 | * version 2.1 of the License, or (at your option) any later version. |
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| 12 | * |
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| 13 | * FFmpeg is distributed in the hope that it will be useful, |
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| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 16 | * Lesser General Public License for more details. |
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| 17 | * |
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| 18 | * You should have received a copy of the GNU Lesser General Public |
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| 19 | * License along with FFmpeg; if not, write to the Free Software |
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| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 21 | */ |
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| 22 | |||
| 23 | #include "libavutil/channel_layout.h" |
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| 24 | #include "libavutil/intreadwrite.h" |
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| 25 | #include "avformat.h" |
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| 26 | #include "pcm.h" |
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| 27 | |||
| 28 | #define AT1_SU_SIZE 212 |
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| 29 | |||
| 30 | static int aea_read_probe(AVProbeData *p) |
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| 31 | { |
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| 32 | if (p->buf_size <= 2048+212) |
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| 33 | return 0; |
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| 34 | |||
| 35 | /* Magic is '00 08 00 00' in Little Endian*/ |
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| 36 | if (AV_RL32(p->buf)==0x800) { |
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| 37 | int bsm_s, bsm_e, inb_s, inb_e, ch; |
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| 38 | ch = p->buf[264]; |
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| 39 | bsm_s = p->buf[2048]; |
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| 40 | inb_s = p->buf[2048+1]; |
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| 41 | inb_e = p->buf[2048+210]; |
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| 42 | bsm_e = p->buf[2048+211]; |
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| 43 | |||
| 44 | if (ch != 1 && ch != 2) |
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| 45 | return 0; |
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| 46 | |||
| 47 | /* Check so that the redundant bsm bytes and info bytes are valid |
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| 48 | * the block size mode bytes have to be the same |
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| 49 | * the info bytes have to be the same |
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| 50 | */ |
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| 51 | if (bsm_s == bsm_e && inb_s == inb_e) |
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| 52 | return AVPROBE_SCORE_MAX / 4 + 1; |
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| 53 | } |
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| 54 | return 0; |
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| 55 | } |
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| 56 | |||
| 57 | static int aea_read_header(AVFormatContext *s) |
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| 58 | { |
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| 59 | AVStream *st = avformat_new_stream(s, NULL); |
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| 60 | if (!st) |
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| 61 | return AVERROR(ENOMEM); |
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| 62 | |||
| 63 | /* Parse the amount of channels and skip to pos 2048(0x800) */ |
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| 64 | avio_skip(s->pb, 264); |
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| 65 | st->codec->channels = avio_r8(s->pb); |
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| 66 | avio_skip(s->pb, 1783); |
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| 67 | |||
| 68 | |||
| 69 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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| 70 | st->codec->codec_id = AV_CODEC_ID_ATRAC1; |
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| 71 | st->codec->sample_rate = 44100; |
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| 72 | st->codec->bit_rate = 292000; |
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| 73 | |||
| 74 | if (st->codec->channels != 1 && st->codec->channels != 2) { |
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| 75 | av_log(s,AV_LOG_ERROR,"Channels %d not supported!\n",st->codec->channels); |
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| 76 | return -1; |
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| 77 | } |
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| 78 | |||
| 79 | st->codec->channel_layout = (st->codec->channels == 1) ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO; |
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| 80 | |||
| 81 | st->codec->block_align = AT1_SU_SIZE * st->codec->channels; |
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| 82 | return 0; |
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| 83 | } |
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| 84 | |||
| 85 | static int aea_read_packet(AVFormatContext *s, AVPacket *pkt) |
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| 86 | { |
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| 87 | int ret = av_get_packet(s->pb, pkt, s->streams[0]->codec->block_align); |
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| 88 | |||
| 89 | pkt->stream_index = 0; |
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| 90 | if (ret <= 0) |
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| 91 | return AVERROR(EIO); |
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| 92 | |||
| 93 | return ret; |
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| 94 | } |
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| 95 | |||
| 96 | AVInputFormat ff_aea_demuxer = { |
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| 97 | .name = "aea", |
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| 98 | .long_name = NULL_IF_CONFIG_SMALL("MD STUDIO audio"), |
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| 99 | .read_probe = aea_read_probe, |
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| 100 | .read_header = aea_read_header, |
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| 101 | .read_packet = aea_read_packet, |
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| 102 | .read_seek = ff_pcm_read_seek, |
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| 103 | .flags = AVFMT_GENERIC_INDEX, |
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| 104 | .extensions = "aea", |
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| 105 | }; |