/* * CRYO APC audio format demuxer * Copyright (c) 2007 Anssi Hannula <anssi.hannula@gmail.com> * * 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 <string.h> #include "libavutil/channel_layout.h"#include "avformat.h"#include "demux.h" static int apc_probe(const AVProbeData *p){    if (!strncmp(p->buf, "CRYO_APC", 8))        return AVPROBE_SCORE_MAX;     return 0;} static int apc_read_header(AVFormatContext *s){    AVIOContext *pb = s->pb;    AVStream *st;    int ret;    int channels;     avio_rl32(pb); /* CRYO */    avio_rl32(pb); /* _APC */    avio_rl32(pb); /* 1.20 */     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_IMA_APC;     avio_rl32(pb); /* number of samples */    st->codecpar->sample_rate = avio_rl32(pb);     /* initial predictor values for adpcm decoder */    if ((ret = ff_get_extradata(s, st->codecpar, pb, 2 * 4)) < 0)        return ret;     channels = !!avio_rl32(pb) + 1;    av_channel_layout_default(&st->codecpar->ch_layout, channels);     st->codecpar->bits_per_coded_sample = 4;    st->codecpar->bit_rate = (int64_t)st->codecpar->bits_per_coded_sample * channels                          * st->codecpar->sample_rate;    st->codecpar->block_align = 1;     return 0;} #define MAX_READ_SIZE 4096 static int apc_read_packet(AVFormatContext *s, AVPacket *pkt){    if (av_get_packet(s->pb, pkt, MAX_READ_SIZE) <= 0)        return AVERROR(EIO);    pkt->stream_index = 0;    return 0;} const FFInputFormat ff_apc_demuxer = {    .p.name         = "apc",    .p.long_name    = NULL_IF_CONFIG_SMALL("CRYO APC"),    .read_probe     = apc_probe,    .read_header    = apc_read_header,    .read_packet    = apc_read_packet,};