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pcm_volume.h
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/*
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* Copyright (C) 2003-2010 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef PCM_VOLUME_H
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#define PCM_VOLUME_H
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#include "
pcm_prng.h
"
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#include <stdint.h>
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#include <stdbool.h>
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enum
{
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PCM_VOLUME_1
= 1024,
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};
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struct
audio_format
;
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static
inline
int
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pcm_float_to_volume
(
float
volume)
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{
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return
volume *
PCM_VOLUME_1
+ 0.5;
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}
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static
inline
int
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pcm_volume_dither
(
void
)
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{
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static
unsigned
long
state;
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uint32_t r;
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r = state =
pcm_prng
(state);
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return
(r & 511) - ((r >> 9) & 511);
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}
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bool
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pcm_volume
(
void
*buffer,
int
length,
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const
struct
audio_format
*
format
,
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int
volume);
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#endif
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