yading@11: /*
yading@11:  * AFC demuxer
yading@11:  * Copyright (c) 2012 Paul B Mahol
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "libavutil/channel_layout.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: 
yading@11: typedef struct AFCDemuxContext {
yading@11:     int64_t    data_end;
yading@11: } AFCDemuxContext;
yading@11: 
yading@11: static int afc_read_header(AVFormatContext *s)
yading@11: {
yading@11:     AFCDemuxContext *c = s->priv_data;
yading@11:     AVStream *st;
yading@11: 
yading@11:     st = avformat_new_stream(s, NULL);
yading@11:     if (!st)
yading@11:         return AVERROR(ENOMEM);
yading@11:     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
yading@11:     st->codec->codec_id   = AV_CODEC_ID_ADPCM_AFC;
yading@11:     st->codec->channels   = 2;
yading@11:     st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
yading@11:     st->codec->extradata_size = 1;
yading@11: 
yading@11:     st->codec->extradata = av_mallocz(1 + FF_INPUT_BUFFER_PADDING_SIZE);
yading@11:     if (!st->codec->extradata)
yading@11:         return AVERROR(ENOMEM);
yading@11:     st->codec->extradata[0] = 8 * st->codec->channels;
yading@11: 
yading@11:     c->data_end = avio_rb32(s->pb) + 32LL;
yading@11:     st->duration = avio_rb32(s->pb);
yading@11:     st->codec->sample_rate = avio_rb16(s->pb);
yading@11:     avio_skip(s->pb, 22);
yading@11:     avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int afc_read_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     AFCDemuxContext *c = s->priv_data;
yading@11:     int64_t size;
yading@11:     int ret;
yading@11: 
yading@11:     size = FFMIN(c->data_end - avio_tell(s->pb), 18 * 128);
yading@11:     if (size <= 0)
yading@11:         return AVERROR_EOF;
yading@11: 
yading@11:     ret = av_get_packet(s->pb, pkt, size);
yading@11:     pkt->stream_index = 0;
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_afc_demuxer = {
yading@11:     .name           = "afc",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("AFC"),
yading@11:     .priv_data_size = sizeof(AFCDemuxContext),
yading@11:     .read_header    = afc_read_header,
yading@11:     .read_packet    = afc_read_packet,
yading@11:     .extensions     = "afc",
yading@11:     .flags          = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK,
yading@11: };