mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
114 lines
3.5 KiB
114 lines
3.5 KiB
/* |
|
* 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 "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 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", |
|
};
|
|
|