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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->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
39 | st->codec->codec_id = AV_CODEC_ID_ADPCM_AFC; | |
40 | st->codec->channels = 2; | |
41 | st->codec->channel_layout = AV_CH_LAYOUT_STEREO; | |
42 | ||
43 | if (ff_alloc_extradata(st->codec, 1)) | |
44 | return AVERROR(ENOMEM); | |
45 | st->codec->extradata[0] = 8 * st->codec->channels; | |
46 | ||
47 | c->data_end = avio_rb32(s->pb) + 32LL; | |
48 | st->duration = avio_rb32(s->pb); | |
49 | st->codec->sample_rate = avio_rb16(s->pb); | |
50 | avio_skip(s->pb, 22); | |
51 | avpriv_set_pts_info(st, 64, 1, st->codec->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 | }; |