mirror of
https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git
synced 2025-11-02 09:01:46 -05:00
dd10c98241
* implement inner loops using liboil * drop "typeid" stuff * add support for channel maps * add support for seperate volumes per channel * add support for hardware mixer settings (only module-oss implements this for now) * fix a lot of types for _t suffix git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@463 fefdeb5f-60dc-0310-8127-8f9354f1896f
107 lines
3.5 KiB
C
107 lines
3.5 KiB
C
#ifndef foovolumehfoo
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#define foovolumehfoo
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/* $Id$ */
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/***
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This file is part of polypaudio.
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polypaudio is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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polypaudio is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with polypaudio; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA.
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***/
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#include <inttypes.h>
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#include <polyp/cdecl.h>
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#include <polyp/sample.h>
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/** \file
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* Constants and routines for volume handling */
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PA_C_DECL_BEGIN
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/** Volume specification:
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* PA_VOLUME_MUTED: silence;
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* < PA_VOLUME_NORM: decreased volume;
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* PA_VOLUME_NORM: normal volume;
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* > PA_VOLUME_NORM: increased volume */
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typedef uint32_t pa_volume_t;
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/** Normal volume (100%) */
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#define PA_VOLUME_NORM (0x10000)
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/** Muted volume (0%) */
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#define PA_VOLUME_MUTED (0)
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/** A structure encapsulating a per-channel volume */
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typedef struct pa_cvolume {
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uint8_t channels;
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pa_volume_t values[PA_CHANNELS_MAX];
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} pa_cvolume;
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/** Return non-zero when *a == *b */
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int pa_cvolume_equal(const pa_cvolume *a, const pa_cvolume *b);
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/** Set the volume of all channels to PA_VOLUME_NORM */
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#define pa_cvolume_reset(a, n) pa_cvolume_set((a), (n), PA_VOLUME_NORM)
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/** Set the volume of all channels to PA_VOLUME_MUTED */
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#define pa_cvolume_mute(a, n) pa_cvolume_set((a), (n), PA_VOLUME_MUTED)
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/** Set the volume of all channels to the specified parameter */
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pa_cvolume* pa_cvolume_set(pa_cvolume *a, unsigned channels, pa_volume_t v);
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/** Pretty print a volume structure */
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#define PA_CVOLUME_SNPRINT_MAX 64
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char *pa_cvolume_snprint(char *s, size_t l, const pa_cvolume *c);
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/** Return the average volume of all channels */
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pa_volume_t pa_cvolume_avg(const pa_cvolume *a);
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/** Return TRUE when the passed cvolume structure is valid, FALSE otherwise */
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int pa_cvolume_valid(const pa_cvolume *v);
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/** Return non-zero if the volume of all channels is equal to the specified value */
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int pa_cvolume_channels_equal_to(const pa_cvolume *a, pa_volume_t v);
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#define pa_cvolume_is_muted(a) pa_cvolume_channels_equal_to((a), PA_VOLUME_MUTED)
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#define pa_cvolume_is_norm(a) pa_cvolume_channels_equal_to((a), PA_VOLUME_NORM)
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/** Multiply two volumes specifications, return the result. This uses PA_VOLUME_NORM as neutral element of multiplication. */
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pa_volume_t pa_sw_volume_multiply(pa_volume_t a, pa_volume_t b);
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pa_cvolume *pa_sw_cvolume_multiply(pa_cvolume *dest, const pa_cvolume *a, const pa_cvolume *b);
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/** Convert a decibel value to a volume. \since 0.4 */
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pa_volume_t pa_sw_volume_from_dB(double f);
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/** Convert a volume to a decibel value. \since 0.4 */
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double pa_sw_volume_to_dB(pa_volume_t v);
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/** Convert a linear factor to a volume. \since 0.8 */
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pa_volume_t pa_sw_volume_from_linear(double v);
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/** Convert a volume to a linear factor. \since 0.8 */
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double pa_sw_volume_to_linear(pa_volume_t v);
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#ifdef INFINITY
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#define PA_DECIBEL_MININFTY (-INFINITY)
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#else
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/** This value is used as minus infinity when using pa_volume_{to,from}_dB(). \since 0.4 */
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#define PA_DECIBEL_MININFTY (-200)
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#endif
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PA_C_DECL_END
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#endif
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