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80 lines
2.7 KiB
80 lines
2.7 KiB
/* |
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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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unsigned k; |
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k = get_ur_golomb_shorten(&gb, 2); |
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if (k > 31) |
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return 0; |
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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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if (k > 31) |
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return 0; |
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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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if (k > 31) |
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return 0; |
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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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const 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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