99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
/*
|
|
* ADP demuxer
|
|
* Copyright (c) 2013 James Almer
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
#include "libavutil/channel_layout.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
|
|
static int adp_probe(AVProbeData *p)
|
|
{
|
|
int i, changes = 0;
|
|
char last = 0;
|
|
|
|
if (p->buf_size < 32)
|
|
return 0;
|
|
|
|
for (i = 0; i < p->buf_size - 3; i+=32) {
|
|
if (p->buf[i] != p->buf[i+2] || p->buf[i+1] != p->buf[i+3])
|
|
return 0;
|
|
if (p->buf[i] != last)
|
|
changes++;
|
|
last = p->buf[i];
|
|
}
|
|
if (changes <= 1)
|
|
return 0;
|
|
|
|
return p->buf_size < 260 ? 1 : AVPROBE_SCORE_MAX / 4;
|
|
}
|
|
|
|
static int adp_read_header(AVFormatContext *s)
|
|
{
|
|
AVStream *st;
|
|
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
|
|
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
st->codec->codec_id = AV_CODEC_ID_ADPCM_DTK;
|
|
st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
|
|
st->codec->channels = 2;
|
|
st->codec->sample_rate = 48000;
|
|
st->start_time = 0;
|
|
if (s->pb->seekable)
|
|
st->duration = av_get_audio_frame_duration(st->codec, avio_size(s->pb));
|
|
|
|
avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int adp_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
int ret, size = 1024;
|
|
|
|
if (url_feof(s->pb))
|
|
return AVERROR_EOF;
|
|
|
|
ret = av_get_packet(s->pb, pkt, size);
|
|
|
|
if (ret != size) {
|
|
if (ret < 0) {
|
|
av_free_packet(pkt);
|
|
return ret;
|
|
}
|
|
av_shrink_packet(pkt, ret);
|
|
}
|
|
pkt->stream_index = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
AVInputFormat ff_adp_demuxer = {
|
|
.name = "adp",
|
|
.long_name = NULL_IF_CONFIG_SMALL("ADP"),
|
|
.read_probe = adp_probe,
|
|
.read_header = adp_read_header,
|
|
.read_packet = adp_read_packet,
|
|
.extensions = "adp,dtk",
|
|
};
|