/* * 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 "avformat.h"#include "string.h"static int apc_probe(AVProbeData *p){    if (!strncmp(p->buf, "CRYO_APC", 8))        return AVPROBE_SCORE_MAX;    return 0;}static int apc_read_header(AVFormatContext *s, AVFormatParameters *ap){    ByteIOContext *pb = s->pb;    AVStream *st;    get_le32(pb); /* CRYO */    get_le32(pb); /* _APC */    get_le32(pb); /* 1.20 */    st = av_new_stream(s, 0);    if (!st)        return AVERROR(ENOMEM);    st->codec->codec_type = CODEC_TYPE_AUDIO;    st->codec->codec_id = CODEC_ID_ADPCM_IMA_WS;    get_le32(pb); /* number of samples */    st->codec->sample_rate = get_le32(pb);    st->codec->extradata_size = 2 * 4;    st->codec->extradata = av_malloc(st->codec->extradata_size +                                     FF_INPUT_BUFFER_PADDING_SIZE);    if (!st->codec->extradata)        return AVERROR(ENOMEM);    /* initial predictor values for adpcm decoder */    get_buffer(pb, st->codec->extradata, 2 * 4);    st->codec->channels = 1;    if (get_le32(pb))        st->codec->channels = 2;    st->codec->bits_per_sample = 4;    st->codec->bit_rate = st->codec->bits_per_sample * st->codec->channels                          * st->codec->sample_rate;    st->codec->block_align = 1;    return 0;}#define MAX_READ_SIZE 4096static 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;}AVInputFormat apc_demuxer = {    "apc",    "CRYO APC format",    0,    apc_probe,    apc_read_header,    apc_read_packet,};