MPD
0.20.18
pcm
PcmMix.hxx
Go to the documentation of this file.
1
/*
2
* Copyright 2003-2017 The Music Player Daemon Project
3
* http://www.musicpd.org
4
*
5
* This program is free software; you can redistribute it and/or modify
6
* it under the terms of the GNU General Public License as published by
7
* the Free Software Foundation; either version 2 of the License, or
8
* (at your option) any later version.
9
*
10
* This program is distributed in the hope that it will be useful,
11
* but WITHOUT ANY WARRANTY; without even the implied warranty of
12
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13
* GNU General Public License for more details.
14
*
15
* You should have received a copy of the GNU General Public License along
16
* with this program; if not, write to the Free Software Foundation, Inc.,
17
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18
*/
19
20
#ifndef MPD_PCM_MIX_HXX
21
#define MPD_PCM_MIX_HXX
22
23
#include "
SampleFormat.hxx
"
24
#include "
Compiler.h
"
25
26
#include <stddef.h>
27
28
class
PcmDither
;
29
30
/*
31
* Linearly mixes two PCM buffers. Both must have the same length and
32
* the same audio format. The formula is:
33
*
34
* s1 := s1 * portion1 + s2 * (1 - portion1)
35
*
36
* @param buffer1 the first PCM buffer, and the destination buffer
37
* @param buffer2 the second PCM buffer
38
* @param size the size of both buffers in bytes
39
* @param format the sample format of both buffers
40
* @param portion1 a number between 0.0 and 1.0 specifying the portion
41
* of the first buffer in the mix; portion2 = (1.0 - portion1).
42
* Negative values are used by the MixRamp code to specify that simple
43
* addition is required.
44
*
45
* @return true on success, false if the format is not supported
46
*/
47
gcc_warn_unused_result
48
bool
49
pcm_mix
(
PcmDither
&dither,
void
*buffer1,
const
void
*buffer2,
size_t
size,
50
SampleFormat
format,
float
portion1);
51
52
#endif
pcm_mix
gcc_warn_unused_result bool pcm_mix(PcmDither &dither, void *buffer1, const void *buffer2, size_t size, SampleFormat format, float portion1)
Compiler.h
SampleFormat
SampleFormat
Definition:
SampleFormat.hxx:33
SampleFormat.hxx
gcc_warn_unused_result
#define gcc_warn_unused_result
Definition:
Compiler.h:119
PcmDither
Definition:
PcmDither.hxx:27
Generated on Mon Mar 5 2018 02:45:27 for MPD by
1.8.14