| /* |
| * 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 "avformat.h" |
| #include "internal.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; |
| int64_t channel_layout = 0; |
| |
| header = avio_rb16(pb); |
| switch (header) { |
| case 0x0400: cdata->channels = 1; break; |
| case 0x0404: cdata->channels = 2; break; |
| case 0x040C: cdata->channels = 4; channel_layout = AV_CH_LAYOUT_QUAD; break; |
| case 0x0414: cdata->channels = 6; channel_layout = AV_CH_LAYOUT_5POINT1_BACK; break; |
| default: |
| av_log(s, AV_LOG_INFO, "unknown header 0x%04x\n", header); |
| return -1; |
| }; |
| |
| 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->channels = cdata->channels; |
| st->codecpar->channel_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; |
| } |
| |
| AVInputFormat ff_ea_cdata_demuxer = { |
| .name = "ea_cdata", |
| .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts cdata"), |
| .priv_data_size = sizeof(CdataDemuxContext), |
| .read_probe = cdata_probe, |
| .read_header = cdata_read_header, |
| .read_packet = cdata_read_packet, |
| .extensions = "cdata", |
| }; |