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.
74 lines
2.5 KiB
74 lines
2.5 KiB
/* |
|
* Shorten demuxer |
|
* Copyright (c) 2001 Fabrice Bellard |
|
* Copyright (c) 2005 Alex Beregszaszi |
|
* Copyright (c) 2015 Carl Eugen Hoyos |
|
* |
|
* 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 "avformat.h" |
|
#include "rawdec.h" |
|
#include "libavcodec/golomb.h" |
|
|
|
static int shn_probe(const AVProbeData *p) |
|
{ |
|
GetBitContext gb; |
|
int version, internal_ftype, channels, blocksize; |
|
|
|
if (AV_RB32(p->buf) != 0x616a6b67) |
|
return 0; |
|
version = p->buf[4]; |
|
if (init_get_bits8(&gb, p->buf + 5, p->buf_size - 5 - AV_INPUT_BUFFER_PADDING_SIZE) < 0) |
|
return 0; |
|
if (!version) { |
|
internal_ftype = get_ur_golomb_shorten(&gb, 4); |
|
channels = get_ur_golomb_shorten(&gb, 0); |
|
blocksize = 256; |
|
} else { |
|
int k; |
|
k = get_ur_golomb_shorten(&gb, 2); |
|
internal_ftype = get_ur_golomb_shorten(&gb, k); |
|
k = get_ur_golomb_shorten(&gb, 2); |
|
channels = get_ur_golomb_shorten(&gb, k); |
|
k = get_ur_golomb_shorten(&gb, 2); |
|
blocksize = get_ur_golomb_shorten(&gb, k); |
|
} |
|
|
|
if (internal_ftype != 2 && internal_ftype != 3 && internal_ftype != 5) |
|
return 0; |
|
if (channels < 1 || channels > 8) |
|
return 0; |
|
if (blocksize < 1 || blocksize > 65535) |
|
return 0; |
|
|
|
return AVPROBE_SCORE_EXTENSION + 1; |
|
} |
|
|
|
FF_RAW_DEMUXER_CLASS(shorten) |
|
AVInputFormat ff_shorten_demuxer = { |
|
.name = "shn", |
|
.long_name = NULL_IF_CONFIG_SMALL("raw Shorten"), |
|
.read_probe = shn_probe, |
|
.read_header = ff_raw_audio_read_header, |
|
.read_packet = ff_raw_read_partial_packet, |
|
.flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK | AVFMT_NOTIMESTAMPS, |
|
.extensions = "shn", |
|
.raw_codec_id = AV_CODEC_ID_SHORTEN, |
|
.priv_data_size = sizeof(FFRawDemuxerContext), |
|
.priv_class = &shorten_demuxer_class, |
|
};
|
|
|