0,0 → 1,91 |
/* |
* 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; |
|
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; |
|
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", |
}; |