1 /*****************************************************************************
2 * opus.h : Opus demux helpers
3 *****************************************************************************
4 * Copyright (C) 2012 VLC authors and VideoLAN
6 * Authors: Timothy B. Terriberry <tterribe@xiph.org>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU Lesser General Public License as published by
10 * the Free Software Foundation; either version 2.1 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public License
19 * along with this program; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
21 *****************************************************************************/
23 /* Returns Opus frame duration in samples */
25 static inline unsigned opus_frame_duration(unsigned char *data
, long len
)
27 static const int silk_fs_div
[4] = { 6000, 3000, 1500, 1000 };
48 nframes
= data
[1]&0x3F;
53 frame_size
= (i_rate
<< (toc
>> 3 & 3)) / 400;
54 else if( ( toc
&0x60 ) == 0x60 )
55 frame_size
= i_rate
/(100 >> (toc
>> 3 & 1));
57 frame_size
= i_rate
*60 / silk_fs_div
[toc
>> 3 & 3];
58 nsamples
= nframes
*frame_size
;
59 if( nsamples
*25 > i_rate
*3 )