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.
89 lines
2.6 KiB
89 lines
2.6 KiB
/* |
|
* CRYO APC audio format demuxer |
|
* Copyright (c) 2007 Anssi Hannula <anssi.hannula@gmail.com> |
|
* |
|
* 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 <string.h> |
|
#include "avformat.h" |
|
|
|
static int apc_probe(AVProbeData *p) |
|
{ |
|
if (!strncmp(p->buf, "CRYO_APC", 8)) |
|
return AVPROBE_SCORE_MAX; |
|
|
|
return 0; |
|
} |
|
|
|
static int apc_read_header(AVFormatContext *s, AVFormatParameters *ap) |
|
{ |
|
AVIOContext *pb = s->pb; |
|
AVStream *st; |
|
|
|
avio_rl32(pb); /* CRYO */ |
|
avio_rl32(pb); /* _APC */ |
|
avio_rl32(pb); /* 1.20 */ |
|
|
|
st = avformat_new_stream(s, NULL); |
|
if (!st) |
|
return AVERROR(ENOMEM); |
|
|
|
st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
|
st->codec->codec_id = CODEC_ID_ADPCM_IMA_WS; |
|
|
|
avio_rl32(pb); /* number of samples */ |
|
st->codec->sample_rate = avio_rl32(pb); |
|
|
|
st->codec->extradata_size = 2 * 4; |
|
st->codec->extradata = av_malloc(st->codec->extradata_size + |
|
FF_INPUT_BUFFER_PADDING_SIZE); |
|
if (!st->codec->extradata) |
|
return AVERROR(ENOMEM); |
|
|
|
/* initial predictor values for adpcm decoder */ |
|
avio_read(pb, st->codec->extradata, 2 * 4); |
|
|
|
st->codec->channels = 1; |
|
if (avio_rl32(pb)) |
|
st->codec->channels = 2; |
|
|
|
st->codec->bits_per_coded_sample = 4; |
|
st->codec->bit_rate = st->codec->bits_per_coded_sample * st->codec->channels |
|
* st->codec->sample_rate; |
|
st->codec->block_align = 1; |
|
|
|
return 0; |
|
} |
|
|
|
#define MAX_READ_SIZE 4096 |
|
|
|
static int apc_read_packet(AVFormatContext *s, AVPacket *pkt) |
|
{ |
|
if (av_get_packet(s->pb, pkt, MAX_READ_SIZE) <= 0) |
|
return AVERROR(EIO); |
|
pkt->stream_index = 0; |
|
return 0; |
|
} |
|
|
|
AVInputFormat ff_apc_demuxer = { |
|
.name = "apc", |
|
.long_name = NULL_IF_CONFIG_SMALL("CRYO APC format"), |
|
.read_probe = apc_probe, |
|
.read_header = apc_read_header, |
|
.read_packet = apc_read_packet, |
|
};
|
|
|