/* * DERF demuxer * Copyright (c) 2020 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 "libavutil/intreadwrite.h"#include "avformat.h"#include "demux.h"#include "internal.h"#include "pcm.h" static int derf_probe(const AVProbeData *p){    if (AV_RL32(p->buf) != MKTAG('D','E','R','F'))        return 0;    if (AV_RL32(p->buf+4) != 1 && AV_RL32(p->buf+4) != 2)        return 0;     return AVPROBE_SCORE_MAX / 3 * 2;} static int derf_read_header(AVFormatContext *s){    unsigned data_size;    int channels;    AVIOContext *pb = s->pb;    AVCodecParameters *par;    AVStream *st;     avio_skip(pb, 4);     st = avformat_new_stream(s, NULL);    if (!st)        return AVERROR(ENOMEM);     par              = st->codecpar;    par->codec_type  = AVMEDIA_TYPE_AUDIO;    par->codec_id    = AV_CODEC_ID_DERF_DPCM;    par->format      = AV_SAMPLE_FMT_S16;    channels         = avio_rl32(pb);    if (channels != 1 && channels != 2)        return AVERROR_INVALIDDATA;    av_channel_layout_default(&par->ch_layout, channels);    data_size = avio_rl32(pb);    st->duration = data_size / channels;    par->sample_rate = 22050;    par->block_align = 1;     avpriv_set_pts_info(st, 64, 1, par->sample_rate);     return 0;} const FFInputFormat ff_derf_demuxer = {    .p.name         = "derf",    .p.long_name    = NULL_IF_CONFIG_SMALL("Xilam DERF"),    .p.extensions   = "adp",    .read_probe     = derf_probe,    .read_header    = derf_read_header,    .read_packet    = ff_pcm_read_packet,    .read_seek      = ff_pcm_read_seek,};