blob: 542cb168fcff68e921364cb3cadd2793dacaf073
1 | /* |
2 | * AFC demuxer |
3 | * Copyright (c) 2012 Paul B Mahol |
4 | * |
5 | * This file is part of FFmpeg. |
6 | * |
7 | * FFmpeg is free software; you can redistribute it and/or |
8 | * modify it under the terms of the GNU Lesser General Public |
9 | * License as published by the Free Software Foundation; either |
10 | * version 2.1 of the License, or (at your option) any later version. |
11 | * |
12 | * FFmpeg is distributed in the hope that it will be useful, |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
15 | * Lesser General Public License for more details. |
16 | * |
17 | * You should have received a copy of the GNU Lesser General Public |
18 | * License along with FFmpeg; if not, write to the Free Software |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
20 | */ |
21 | |
22 | #include "libavutil/channel_layout.h" |
23 | #include "avformat.h" |
24 | #include "internal.h" |
25 | |
26 | typedef struct AFCDemuxContext { |
27 | int64_t data_end; |
28 | } AFCDemuxContext; |
29 | |
30 | static int afc_read_header(AVFormatContext *s) |
31 | { |
32 | AFCDemuxContext *c = s->priv_data; |
33 | AVStream *st; |
34 | |
35 | st = avformat_new_stream(s, NULL); |
36 | if (!st) |
37 | return AVERROR(ENOMEM); |
38 | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
39 | st->codecpar->codec_id = AV_CODEC_ID_ADPCM_AFC; |
40 | st->codecpar->channels = 2; |
41 | st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO; |
42 | |
43 | if (ff_alloc_extradata(st->codecpar, 1)) |
44 | return AVERROR(ENOMEM); |
45 | st->codecpar->extradata[0] = 8 * st->codecpar->channels; |
46 | |
47 | c->data_end = avio_rb32(s->pb) + 32LL; |
48 | st->duration = avio_rb32(s->pb); |
49 | st->codecpar->sample_rate = avio_rb16(s->pb); |
50 | avio_skip(s->pb, 22); |
51 | avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); |
52 | |
53 | return 0; |
54 | } |
55 | |
56 | static int afc_read_packet(AVFormatContext *s, AVPacket *pkt) |
57 | { |
58 | AFCDemuxContext *c = s->priv_data; |
59 | int64_t size; |
60 | int ret; |
61 | |
62 | size = FFMIN(c->data_end - avio_tell(s->pb), 18 * 128); |
63 | if (size <= 0) |
64 | return AVERROR_EOF; |
65 | |
66 | ret = av_get_packet(s->pb, pkt, size); |
67 | pkt->stream_index = 0; |
68 | return ret; |
69 | } |
70 | |
71 | AVInputFormat ff_afc_demuxer = { |
72 | .name = "afc", |
73 | .long_name = NULL_IF_CONFIG_SMALL("AFC"), |
74 | .priv_data_size = sizeof(AFCDemuxContext), |
75 | .read_header = afc_read_header, |
76 | .read_packet = afc_read_packet, |
77 | .extensions = "afc", |
78 | .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK, |
79 | }; |
80 |