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f6d1b18b3d
This allows testing parsers with a wider range of input packet sizes. Which is important and usefull for regression testing, some of our parsers in fact to not work if the packet size is changed from 1024 Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
75 lines
2.5 KiB
C
75 lines
2.5 KiB
C
/*
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* Shorten demuxer
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* Copyright (c) 2001 Fabrice Bellard
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* Copyright (c) 2005 Alex Beregszaszi
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* Copyright (c) 2015 Carl Eugen Hoyos
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include "rawdec.h"
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#include "libavcodec/golomb.h"
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static int shn_probe(const AVProbeData *p)
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{
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GetBitContext gb;
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int version, internal_ftype, channels, blocksize;
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if (AV_RB32(p->buf) != 0x616a6b67)
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return 0;
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version = p->buf[4];
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if (init_get_bits8(&gb, p->buf + 5, p->buf_size - 5 - AV_INPUT_BUFFER_PADDING_SIZE) < 0)
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return 0;
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if (!version) {
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internal_ftype = get_ur_golomb_shorten(&gb, 4);
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channels = get_ur_golomb_shorten(&gb, 0);
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blocksize = 256;
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} else {
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int k;
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k = get_ur_golomb_shorten(&gb, 2);
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internal_ftype = get_ur_golomb_shorten(&gb, k);
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k = get_ur_golomb_shorten(&gb, 2);
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channels = get_ur_golomb_shorten(&gb, k);
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k = get_ur_golomb_shorten(&gb, 2);
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blocksize = get_ur_golomb_shorten(&gb, k);
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}
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if (internal_ftype != 2 && internal_ftype != 3 && internal_ftype != 5)
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return 0;
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if (channels < 1 || channels > 8)
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return 0;
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if (blocksize < 1 || blocksize > 65535)
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return 0;
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return AVPROBE_SCORE_EXTENSION + 1;
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}
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FF_RAW_DEMUXER_CLASS(shorten)
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AVInputFormat ff_shorten_demuxer = {
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.name = "shn",
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.long_name = NULL_IF_CONFIG_SMALL("raw Shorten"),
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.read_probe = shn_probe,
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.read_header = ff_raw_audio_read_header,
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.read_packet = ff_raw_read_partial_packet,
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.flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK | AVFMT_NOTIMESTAMPS,
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.extensions = "shn",
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.raw_codec_id = AV_CODEC_ID_SHORTEN,
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.priv_data_size = sizeof(FFRawDemuxerContext),
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.priv_class = &shorten_demuxer_class,
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};
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