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99 lines
3 KiB
C
99 lines
3 KiB
C
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#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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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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};
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/** Return non-zero when *a == *b */
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int pa_cvolume_equal(const struct pa_cvolume *a, const struct pa_cvolume *b);
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/** Set the volume of all channels to PA_VOLUME_NORM */
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void pa_cvolume_reset(struct pa_cvolume *a);
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/** Set the volume of all channels to PA_VOLUME_MUTED */
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void pa_cvolume_mute(struct pa_cvolume *a);
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/** Set the volume of all channels to the specified parameter */
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void pa_cvolume_set(struct pa_cvolume *a, pa_volume_t v);
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/** Pretty print a volume structure */
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char *pa_cvolume_snprintf(char *s, size_t l, const struct pa_cvolume *c, unsigned channels);
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/** Return the average volume of all channels */
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pa_volume_t pa_cvolume_avg(const struct pa_cvolume *a);
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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 struct pa_cvolume *a, uint8_t channels, pa_volume_t v);
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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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/** 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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