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