/* * 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 * Electronic Arts cdata Format Demuxer * by Peter Ross (pross@xvid.org) * * Technical details here: *  http://wiki.multimedia.cx/index.php?title=EA_Command_And_Conquer_3_Audio_Codec */ #include "libavutil/channel_layout.h"#include "avformat.h"#include "demux.h"#include "internal.h" #include "libavutil/channel_layout.h" typedef struct CdataDemuxContext {  unsigned int channels;  unsigned int audio_pts;} CdataDemuxContext; static int cdata_probe(const AVProbeData *p){    const uint8_t *b = p->buf;     if (b[0] == 0x04 && (b[1] == 0x00 || b[1] == 0x04 || b[1] == 0x0C || b[1] == 0x14))        return AVPROBE_SCORE_MAX/8;    return 0;} static int cdata_read_header(AVFormatContext *s){    CdataDemuxContext *cdata = s->priv_data;    AVIOContext *pb = s->pb;    unsigned int sample_rate, header;    AVStream *st;    AVChannelLayout channel_layout;     header = avio_rb16(pb);    switch (header) {        case 0x0400:            channel_layout = (AVChannelLayout){ .nb_channels = 1, .order = AV_CHANNEL_ORDER_UNSPEC };            break;        case 0x0404:            channel_layout  = (AVChannelLayout){ .nb_channels = 2, .order = AV_CHANNEL_ORDER_UNSPEC };            break;        case 0x040C:            channel_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_QUAD;         break;        case 0x0414:            channel_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_5POINT1_BACK; break;        default:            av_log(s, AV_LOG_INFO, "unknown header 0x%04x\n", header);            return -1;    };    cdata->channels = channel_layout.nb_channels;     sample_rate = avio_rb16(pb);    avio_skip(pb, (avio_r8(pb) & 0x20) ? 15 : 11);     st = avformat_new_stream(s, NULL);    if (!st)        return AVERROR(ENOMEM);    st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;    st->codecpar->codec_tag = 0; /* no fourcc */    st->codecpar->codec_id = AV_CODEC_ID_ADPCM_EA_XAS;    st->codecpar->ch_layout = channel_layout;    st->codecpar->sample_rate = sample_rate;    avpriv_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;     int ret = av_get_packet(s->pb, pkt, packet_size);    if (ret < 0)        return ret;    pkt->pts = cdata->audio_pts++;    return 0;} const FFInputFormat ff_ea_cdata_demuxer = {    .p.name         = "ea_cdata",    .p.long_name    = NULL_IF_CONFIG_SMALL("Electronic Arts cdata"),    .p.extensions   = "cdata",    .priv_data_size = sizeof(CdataDemuxContext),    .read_probe     = cdata_probe,    .read_header    = cdata_read_header,    .read_packet    = cdata_read_packet,};