From 5bb127a98f3d7c8e4f3da4dfa5e8d697d5a2dbdc Mon Sep 17 00:00:00 2001 From: Aurelien Jacobs Date: Sun, 25 Mar 2007 01:06:45 +0000 Subject: extract vorbis header spliting code into a reusable function Original thread: Date: Thu, 22 Mar 2007 20:23:08 -0400 Subject: [Ffmpeg-devel] [PATCH] Theora in MKV (GSoC '07 Qualification) Originally committed as revision 8505 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/xiph.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) create mode 100644 libavcodec/xiph.c (limited to 'libavcodec/xiph.c') diff --git a/libavcodec/xiph.c b/libavcodec/xiph.c new file mode 100644 index 0000000000..65c9d56037 --- /dev/null +++ b/libavcodec/xiph.c @@ -0,0 +1,56 @@ +/* + * Copyright (C) 2007 FFmpeg Project + * + * 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 "xiph.h" + +int ff_split_xiph_headers(uint8_t *extradata, int extradata_size, + int first_header_size, uint8_t *header_start[3], + int header_len[3]) +{ + int i, j; + + if (AV_RB16(extradata) == first_header_size) { + for (i=0; i<3; i++) { + header_len[i] = AV_RB16(extradata); + extradata += 2; + header_start[i] = extradata; + extradata += header_len[i]; + } + } else if (extradata[0] == 2) { + for (i=0,j=1; i<2; i++,j++) { + header_len[i] = 0; + for (; j= extradata_size) + return -1; + + header_len[i] += extradata[j]; + } + header_len[2] = extradata_size - header_len[0] - header_len[1] - j; + extradata += j; + header_start[0] = extradata; + header_start[1] = header_start[0] + header_len[0]; + header_start[2] = header_start[1] + header_len[1]; + } else { + return -1; + } + return 0; +} -- cgit v1.2.3