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https://git.ffmpeg.org/ffmpeg.git
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80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
/*
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* AFC demuxer
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* Copyright (c) 2012 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/channel_layout.h"
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#include "avformat.h"
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#include "internal.h"
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typedef struct AFCDemuxContext {
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int64_t data_end;
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} AFCDemuxContext;
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static int afc_read_header(AVFormatContext *s)
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{
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AFCDemuxContext *c = s->priv_data;
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AVStream *st;
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int ret;
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = AV_CODEC_ID_ADPCM_AFC;
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st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
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if ((ret = ff_alloc_extradata(st->codecpar, 1)) < 0)
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return ret;
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st->codecpar->extradata[0] = 8 * st->codecpar->ch_layout.nb_channels;
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c->data_end = avio_rb32(s->pb) + 32LL;
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st->duration = avio_rb32(s->pb);
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st->codecpar->sample_rate = avio_rb16(s->pb);
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avio_skip(s->pb, 22);
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avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
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return 0;
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}
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static int afc_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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AFCDemuxContext *c = s->priv_data;
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int64_t size = c->data_end - avio_tell(s->pb);
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int ret;
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size = FFMIN(size, 18 * 128);
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if (size <= 0)
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return AVERROR_EOF;
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ret = av_get_packet(s->pb, pkt, size);
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pkt->stream_index = 0;
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return ret;
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}
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const AVInputFormat ff_afc_demuxer = {
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.name = "afc",
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.long_name = NULL_IF_CONFIG_SMALL("AFC"),
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.priv_data_size = sizeof(AFCDemuxContext),
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.read_header = afc_read_header,
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.read_packet = afc_read_packet,
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.extensions = "afc",
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.flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK,
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};
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