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105 lines
3.2 KiB
105 lines
3.2 KiB
/* |
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* Electronic Arts .cdata file Demuxer |
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* Copyright (c) 2007 Peter Ross |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* Electronic Arts cdata Format Demuxer |
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* by Peter Ross (pross@xvid.org) |
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* |
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* Technical details here: |
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* http://wiki.multimedia.cx/index.php?title=EA_Command_And_Conquer_3_Audio_Codec |
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*/ |
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#include "avformat.h" |
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#include "internal.h" |
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typedef struct { |
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unsigned int channels; |
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unsigned int audio_pts; |
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} CdataDemuxContext; |
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static int cdata_probe(AVProbeData *p) |
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{ |
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const uint8_t *b = p->buf; |
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if (b[0] == 0x04 && (b[1] == 0x00 || b[1] == 0x04 || b[1] == 0x0C || b[1] == 0x14)) |
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return AVPROBE_SCORE_MAX/8; |
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return 0; |
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} |
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static int cdata_read_header(AVFormatContext *s) |
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{ |
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CdataDemuxContext *cdata = s->priv_data; |
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AVIOContext *pb = s->pb; |
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unsigned int sample_rate, header; |
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AVStream *st; |
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int64_t channel_layout = 0; |
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header = avio_rb16(pb); |
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switch (header) { |
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case 0x0400: cdata->channels = 1; break; |
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case 0x0404: cdata->channels = 2; break; |
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case 0x040C: cdata->channels = 4; channel_layout = AV_CH_LAYOUT_QUAD; break; |
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case 0x0414: cdata->channels = 6; channel_layout = AV_CH_LAYOUT_5POINT1_BACK; break; |
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default: |
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av_log(s, AV_LOG_INFO, "unknown header 0x%04x\n", header); |
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return -1; |
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}; |
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sample_rate = avio_rb16(pb); |
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avio_skip(pb, (avio_r8(pb) & 0x20) ? 15 : 11); |
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st = avformat_new_stream(s, NULL); |
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if (!st) |
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return AVERROR(ENOMEM); |
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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st->codec->codec_tag = 0; /* no fourcc */ |
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st->codec->codec_id = AV_CODEC_ID_ADPCM_EA_XAS; |
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st->codec->channels = cdata->channels; |
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st->codec->channel_layout = channel_layout; |
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st->codec->sample_rate = sample_rate; |
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avpriv_set_pts_info(st, 64, 1, sample_rate); |
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cdata->audio_pts = 0; |
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return 0; |
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} |
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static int cdata_read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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CdataDemuxContext *cdata = s->priv_data; |
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int packet_size = 76*cdata->channels; |
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int ret = av_get_packet(s->pb, pkt, packet_size); |
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if (ret < 0) |
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return ret; |
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pkt->pts = cdata->audio_pts++; |
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return 0; |
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} |
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AVInputFormat ff_ea_cdata_demuxer = { |
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.name = "ea_cdata", |
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.long_name = NULL_IF_CONFIG_SMALL("Electronic Arts cdata"), |
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.priv_data_size = sizeof(CdataDemuxContext), |
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.read_probe = cdata_probe, |
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.read_header = cdata_read_header, |
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.read_packet = cdata_read_packet, |
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.extensions = "cdata", |
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};
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