mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-15 11:44:49 +00:00
b800327f4c
This commit does for AVInputFormat what commit59c9dc82f4did for AVOutputFormat: It adds a new type FFInputFormat, moves all the internals of AVInputFormat to it and adds a now reduced AVInputFormat as first member. This does not affect/improve extensibility of both public or private fields for demuxers (it is still a mess due to lavd). This is possible since50f34172e0(which removed the last usage of an internal field of AVInputFormat in fftools). (Hint: tools/probetest.c accesses the internals of FFInputFormat as well, but given that it is a testing tool this is not considered a problem.) Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
81 lines
2.6 KiB
C
81 lines
2.6 KiB
C
/*
|
|
* 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 "demux.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 {
|
|
unsigned k;
|
|
k = get_ur_golomb_shorten(&gb, 2);
|
|
if (k > 31)
|
|
return 0;
|
|
internal_ftype = get_ur_golomb_shorten(&gb, k);
|
|
k = get_ur_golomb_shorten(&gb, 2);
|
|
if (k > 31)
|
|
return 0;
|
|
channels = get_ur_golomb_shorten(&gb, k);
|
|
k = get_ur_golomb_shorten(&gb, 2);
|
|
if (k > 31)
|
|
return 0;
|
|
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;
|
|
}
|
|
|
|
const FFInputFormat ff_shorten_demuxer = {
|
|
.p.name = "shn",
|
|
.p.long_name = NULL_IF_CONFIG_SMALL("raw Shorten"),
|
|
.p.flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK | AVFMT_NOTIMESTAMPS,
|
|
.p.extensions = "shn",
|
|
.p.priv_class = &ff_raw_demuxer_class,
|
|
.read_probe = shn_probe,
|
|
.read_header = ff_raw_audio_read_header,
|
|
.read_packet = ff_raw_read_partial_packet,
|
|
.raw_codec_id = AV_CODEC_ID_SHORTEN,
|
|
.priv_data_size = sizeof(FFRawDemuxerContext),
|
|
};
|