From d89820002a7f939c8f4be7e2253bab7a482fc976 Mon Sep 17 00:00:00 2001 From: Carl Eugen Hoyos Date: Sat, 3 Oct 2015 21:48:16 +0200 Subject: lavf/shortendec: Autodetect raw Shorten streams. Move the demuxer into its own file. --- libavformat/shortendec.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 71 insertions(+) create mode 100644 libavformat/shortendec.c (limited to 'libavformat/shortendec.c') diff --git a/libavformat/shortendec.c b/libavformat/shortendec.c new file mode 100644 index 0000000000..42fcdf75c3 --- /dev/null +++ b/libavformat/shortendec.c @@ -0,0 +1,71 @@ +/* + * 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(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; +} + +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, +}; -- cgit v1.2.3