1 /*****************************************************************************
2 * opus.h : Opus demux helpers
3 *****************************************************************************
4 * Copyright (C) 2012 VLC authors and VideoLAN
7 * Authors: Timothy B. Terriberry <tterribe@xiph.org>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU Lesser General Public License as published by
11 * the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this program; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /* Returns Opus frame duration in samples */
26 static inline unsigned opus_frame_duration(unsigned char *data
, long len
)
28 static const int silk_fs_div
[4] = { 6000, 3000, 1500, 1000 };
49 nframes
= data
[1]&0x3F;
54 frame_size
= (i_rate
<< (toc
>> 3 & 3)) / 400;
55 else if( ( toc
&0x60 ) == 0x60 )
56 frame_size
= i_rate
/(100 >> (toc
>> 3 & 1));
58 frame_size
= i_rate
*60 / silk_fs_div
[toc
>> 3 & 3];
59 nsamples
= nframes
*frame_size
;
60 if( nsamples
*25 > i_rate
*3 )