From e205b25d65ccb380fa158711e24d55b6de5d9bc1 Mon Sep 17 00:00:00 2001
From: Pierre Ossman <ossman@cendio.se>
Date: Thu, 16 Feb 2006 19:19:58 +0000
Subject: Reorganised the source tree. We now have src/ with a couple of
 subdirs:

 * daemon/ - Contains the files specific to the polypaudio daemon.
 * modules/ - All loadable modules.
 * polyp/ - Files that are part of the public, application interface or
   are only used in libpolyp.
 * polypcore/ - All other shared files.
 * tests/ - Test programs.
 * utils/ - Utility programs.


git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@487 fefdeb5f-60dc-0310-8127-8f9354f1896f
---
 src/polyp/volume.h | 107 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 src/polyp/volume.h

(limited to 'src/polyp/volume.h')

diff --git a/src/polyp/volume.h b/src/polyp/volume.h
new file mode 100644
index 00000000..b2a48084
--- /dev/null
+++ b/src/polyp/volume.h
@@ -0,0 +1,107 @@
+#ifndef foovolumehfoo
+#define foovolumehfoo
+
+/* $Id$ */
+
+/***
+  This file is part of polypaudio.
+ 
+  polypaudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as published
+  by the Free Software Foundation; either version 2 of the License,
+  or (at your option) any later version.
+ 
+  polypaudio is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  General Public License for more details.
+ 
+  You should have received a copy of the GNU Lesser General Public License
+  along with polypaudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#include <inttypes.h>
+#include <polyp/cdecl.h>
+#include <polyp/sample.h>
+
+/** \file
+ * Constants and routines for volume handling */
+
+PA_C_DECL_BEGIN
+
+/** Volume specification:
+ *  PA_VOLUME_MUTED: silence;
+ * < PA_VOLUME_NORM: decreased volume;
+ *   PA_VOLUME_NORM: normal volume;
+ * > PA_VOLUME_NORM: increased volume */
+typedef uint32_t pa_volume_t;
+
+/** Normal volume (100%) */
+#define PA_VOLUME_NORM (0x10000)
+
+/** Muted volume (0%) */
+#define PA_VOLUME_MUTED (0)
+
+/** A structure encapsulating a per-channel volume */
+typedef struct pa_cvolume {
+    uint8_t channels;
+    pa_volume_t values[PA_CHANNELS_MAX];
+} pa_cvolume;
+
+/** Return non-zero when *a == *b */
+int pa_cvolume_equal(const pa_cvolume *a, const pa_cvolume *b);
+
+/** Set the volume of all channels to PA_VOLUME_NORM */
+#define pa_cvolume_reset(a, n) pa_cvolume_set((a), (n), PA_VOLUME_NORM)
+
+/** Set the volume of all channels to PA_VOLUME_MUTED */
+#define pa_cvolume_mute(a, n) pa_cvolume_set((a), (n), PA_VOLUME_MUTED)
+
+/** Set the volume of all channels to the specified parameter */
+pa_cvolume* pa_cvolume_set(pa_cvolume *a, unsigned channels, pa_volume_t v);
+
+/** Pretty print a volume structure */
+#define PA_CVOLUME_SNPRINT_MAX 64
+char *pa_cvolume_snprint(char *s, size_t l, const pa_cvolume *c);
+
+/** Return the average volume of all channels */
+pa_volume_t pa_cvolume_avg(const pa_cvolume *a);
+
+/** Return TRUE when the passed cvolume structure is valid, FALSE otherwise */
+int pa_cvolume_valid(const pa_cvolume *v);
+
+/** Return non-zero if the volume of all channels is equal to the specified value */
+int pa_cvolume_channels_equal_to(const pa_cvolume *a, pa_volume_t v);
+
+#define pa_cvolume_is_muted(a) pa_cvolume_channels_equal_to((a), PA_VOLUME_MUTED)
+#define pa_cvolume_is_norm(a) pa_cvolume_channels_equal_to((a), PA_VOLUME_NORM)
+
+/** Multiply two volumes specifications, return the result. This uses PA_VOLUME_NORM as neutral element of multiplication. */
+pa_volume_t pa_sw_volume_multiply(pa_volume_t a, pa_volume_t b);
+
+pa_cvolume *pa_sw_cvolume_multiply(pa_cvolume *dest, const pa_cvolume *a, const pa_cvolume *b);
+
+/** Convert a decibel value to a volume. \since 0.4 */
+pa_volume_t pa_sw_volume_from_dB(double f);
+
+/** Convert a volume to a decibel value.  \since 0.4 */
+double pa_sw_volume_to_dB(pa_volume_t v);
+
+/** Convert a linear factor to a volume. \since 0.8 */
+pa_volume_t pa_sw_volume_from_linear(double v);
+
+/** Convert a volume to a linear factor. \since 0.8 */
+double pa_sw_volume_to_linear(pa_volume_t v);
+
+#ifdef INFINITY
+#define PA_DECIBEL_MININFTY (-INFINITY)
+#else
+/** This value is used as minus infinity when using pa_volume_{to,from}_dB(). \since 0.4 */
+#define PA_DECIBEL_MININFTY (-200)
+#endif
+
+PA_C_DECL_END
+
+#endif
-- 
cgit