3 * Copyright (c) 2012 Paul B Mahol
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/channel_layout.h"
26 typedef struct AFCDemuxContext {
30 static int afc_read_header(AVFormatContext *s)
32 AFCDemuxContext *c = s->priv_data;
35 st = avformat_new_stream(s, NULL);
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 st->codec->extradata_size = 1;
44 st->codec->extradata = av_mallocz(1 + FF_INPUT_BUFFER_PADDING_SIZE);
45 if (!st->codec->extradata)
46 return AVERROR(ENOMEM);
47 st->codec->extradata[0] = 8 * st->codec->channels;
49 c->data_end = avio_rb32(s->pb) + 32LL;
50 st->duration = avio_rb32(s->pb);
51 st->codec->sample_rate = avio_rb16(s->pb);
53 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
58 static int afc_read_packet(AVFormatContext *s, AVPacket *pkt)
60 AFCDemuxContext *c = s->priv_data;
64 size = FFMIN(c->data_end - avio_tell(s->pb), 18 * 128);
68 ret = av_get_packet(s->pb, pkt, size);
69 pkt->stream_index = 0;
73 AVInputFormat ff_afc_demuxer = {
75 .long_name = NULL_IF_CONFIG_SMALL("AFC"),
76 .priv_data_size = sizeof(AFCDemuxContext),
77 .read_header = afc_read_header,
78 .read_packet = afc_read_packet,
80 .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK,