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
26typedef struct AFCDemuxContext {
27    int64_t    data_end;
28} AFCDemuxContext;
29
30static 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
56static 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
71AVInputFormat 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