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2ba45a60 DM |
1 | /* |
2 | * MD STUDIO audio demuxer | |
3 | * | |
4 | * Copyright (c) 2009 Benjamin Larsson | |
5 | * | |
6 | * This file is part of FFmpeg. | |
7 | * | |
8 | * FFmpeg 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 | * FFmpeg 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 FFmpeg; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
21 | */ | |
22 | ||
23 | #include "libavutil/channel_layout.h" | |
24 | #include "libavutil/intreadwrite.h" | |
25 | #include "avformat.h" | |
26 | #include "pcm.h" | |
27 | ||
28 | #define AT1_SU_SIZE 212 | |
29 | ||
30 | static int aea_read_probe(AVProbeData *p) | |
31 | { | |
32 | if (p->buf_size <= 2048+212) | |
33 | return 0; | |
34 | ||
35 | /* Magic is '00 08 00 00' in Little Endian*/ | |
36 | if (AV_RL32(p->buf)==0x800) { | |
37 | int bsm_s, bsm_e, inb_s, inb_e, ch; | |
38 | ch = p->buf[264]; | |
39 | bsm_s = p->buf[2048]; | |
40 | inb_s = p->buf[2048+1]; | |
41 | inb_e = p->buf[2048+210]; | |
42 | bsm_e = p->buf[2048+211]; | |
43 | ||
44 | if (ch != 1 && ch != 2) | |
45 | return 0; | |
46 | ||
47 | /* Check so that the redundant bsm bytes and info bytes are valid | |
48 | * the block size mode bytes have to be the same | |
49 | * the info bytes have to be the same | |
50 | */ | |
51 | if (bsm_s == bsm_e && inb_s == inb_e) | |
52 | return AVPROBE_SCORE_MAX / 4 + 1; | |
53 | } | |
54 | return 0; | |
55 | } | |
56 | ||
57 | static int aea_read_header(AVFormatContext *s) | |
58 | { | |
59 | AVStream *st = avformat_new_stream(s, NULL); | |
60 | if (!st) | |
61 | return AVERROR(ENOMEM); | |
62 | ||
63 | /* Parse the amount of channels and skip to pos 2048(0x800) */ | |
64 | avio_skip(s->pb, 264); | |
65 | st->codec->channels = avio_r8(s->pb); | |
66 | avio_skip(s->pb, 1783); | |
67 | ||
68 | ||
69 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
70 | st->codec->codec_id = AV_CODEC_ID_ATRAC1; | |
71 | st->codec->sample_rate = 44100; | |
72 | st->codec->bit_rate = 292000; | |
73 | ||
74 | if (st->codec->channels != 1 && st->codec->channels != 2) { | |
75 | av_log(s,AV_LOG_ERROR,"Channels %d not supported!\n",st->codec->channels); | |
76 | return -1; | |
77 | } | |
78 | ||
79 | st->codec->channel_layout = (st->codec->channels == 1) ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO; | |
80 | ||
81 | st->codec->block_align = AT1_SU_SIZE * st->codec->channels; | |
82 | return 0; | |
83 | } | |
84 | ||
85 | static int aea_read_packet(AVFormatContext *s, AVPacket *pkt) | |
86 | { | |
87 | int ret = av_get_packet(s->pb, pkt, s->streams[0]->codec->block_align); | |
88 | ||
89 | pkt->stream_index = 0; | |
90 | if (ret <= 0) | |
91 | return AVERROR(EIO); | |
92 | ||
93 | return ret; | |
94 | } | |
95 | ||
96 | AVInputFormat ff_aea_demuxer = { | |
97 | .name = "aea", | |
98 | .long_name = NULL_IF_CONFIG_SMALL("MD STUDIO audio"), | |
99 | .read_probe = aea_read_probe, | |
100 | .read_header = aea_read_header, | |
101 | .read_packet = aea_read_packet, | |
102 | .read_seek = ff_pcm_read_seek, | |
103 | .flags = AVFMT_GENERIC_INDEX, | |
104 | .extensions = "aea", | |
105 | }; |