/* * Electronic Arts .cdata file Demuxer * Copyright (c) 2007 Peter Ross * * 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 *//** * @file eacdata.c * Electronic Arts cdata Format Demuxer * by Peter Ross (suxen_drol at hotmail dot com) * * Technical details here: *  http://wiki.multimedia.cx/index.php?title=EA_Command_And_Conquer_3_Audio_Codec */#include "avformat.h"typedef struct {  unsigned int channels;  unsigned int audio_pts;} CdataDemuxContext;static int cdata_probe(AVProbeData *p){    const uint8_t *b = p->buf;    if (b[0] == 0x04 && (b[1] == 0x00 || b[1] == 0x04 || b[1] == 0x0C))        return AVPROBE_SCORE_MAX/8;    return 0;}static int cdata_read_header(AVFormatContext *s, AVFormatParameters *ap){    CdataDemuxContext *cdata = s->priv_data;    ByteIOContext *pb = s->pb;    unsigned int sample_rate, header;    AVStream *st;    header = get_be16(pb);    switch (header) {        case 0x0400: cdata->channels = 1; break;        case 0x0404: cdata->channels = 2; break;        case 0x040C: cdata->channels = 4; break;        default:            av_log(s, AV_LOG_INFO, "unknown header 0x%04x\n", header);            return -1;    };    sample_rate = get_be16(pb);    url_fskip(pb, 12);    st = av_new_stream(s, 0);    if (!st)        return AVERROR(ENOMEM);    st->codec->codec_type = CODEC_TYPE_AUDIO;    st->codec->codec_tag = 0; /* no fourcc */    st->codec->codec_id = CODEC_ID_ADPCM_EA_XAS;    st->codec->channels = cdata->channels;    st->codec->sample_rate = sample_rate;    av_set_pts_info(st, 64, 1, sample_rate);    cdata->audio_pts = 0;    return 0;}static int cdata_read_packet(AVFormatContext *s, AVPacket *pkt){    CdataDemuxContext *cdata = s->priv_data;    int packet_size = 76*cdata->channels;    if (av_get_packet(s->pb, pkt, packet_size) != packet_size)        return AVERROR(EIO);    pkt->pts = cdata->audio_pts++;    return 1;}AVInputFormat ea_cdata_demuxer = {    "ea_cdata",    NULL_IF_CONFIG_SMALL("Electronic Arts cdata"),    sizeof(CdataDemuxContext),    cdata_probe,    cdata_read_header,    cdata_read_packet,    .extensions = "cdata",};