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72 lines
2.4 KiB
72 lines
2.4 KiB
9 years ago
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/*
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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(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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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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};
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