big s/polyp/pulse/g

git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@1033 fefdeb5f-60dc-0310-8127-8f9354f1896f

1 files changed, 176 insertions, 0 deletions

diff --git a/src/pulse/volume.c b/src/pulse/volume.c
new file mode 100644
index 00000000..530814e0
--- /dev/null
+++ b/src/pulse/volume.c
@@ -0,0 +1,176 @@
+/* $Id$ */
+
+/***
+  This file is part of PulseAudio.
+ 
+  PulseAudio 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.
+ 
+  PulseAudio 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 PulseAudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "volume.h"
+
+int pa_cvolume_equal(const pa_cvolume *a, const pa_cvolume *b) {
+    int i;
+    assert(a);
+    assert(b);
+
+    if (a->channels != b->channels)
+        return 0;
+    
+    for (i = 0; i < a->channels; i++)
+        if (a->values[i] != b->values[i])
+            return 0;
+
+    return 1;
+}
+
+pa_cvolume* pa_cvolume_set(pa_cvolume *a, unsigned channels, pa_volume_t v) {
+    int i;
+    
+    assert(a);
+    assert(channels > 0);
+    assert(channels <= PA_CHANNELS_MAX);
+
+    a->channels = channels;
+
+    for (i = 0; i < a->channels; i++)
+        a->values[i] = v;
+
+    return a;
+}
+
+pa_volume_t pa_cvolume_avg(const pa_cvolume *a) {
+    uint64_t sum = 0;
+    int i;
+    assert(a);
+
+    for (i = 0; i < a->channels; i++)
+        sum += a->values[i];
+
+    sum /= a->channels;
+
+    return (pa_volume_t) sum;
+}
+
+pa_volume_t pa_sw_volume_multiply(pa_volume_t a, pa_volume_t b) {
+    return pa_sw_volume_from_linear(pa_sw_volume_to_linear(a)* pa_sw_volume_to_linear(b));
+}
+
+#define USER_DECIBEL_RANGE 30
+
+pa_volume_t pa_sw_volume_from_dB(double dB) {
+    if (dB <= -USER_DECIBEL_RANGE)
+        return PA_VOLUME_MUTED;
+
+    return (pa_volume_t) ((dB/USER_DECIBEL_RANGE+1)*PA_VOLUME_NORM);
+}
+
+double pa_sw_volume_to_dB(pa_volume_t v) {
+    if (v == PA_VOLUME_MUTED)
+        return PA_DECIBEL_MININFTY;
+
+    return ((double) v/PA_VOLUME_NORM-1)*USER_DECIBEL_RANGE;
+}
+
+pa_volume_t pa_sw_volume_from_linear(double v) {
+
+    if (v <= 0)
+        return PA_VOLUME_MUTED;
+
+    if (v > .999 && v < 1.001)
+        return PA_VOLUME_NORM;
+
+    return pa_sw_volume_from_dB(20*log10(v));
+}
+
+double pa_sw_volume_to_linear(pa_volume_t v) {
+
+    if (v == PA_VOLUME_MUTED)
+        return 0;
+
+    return pow(10, pa_sw_volume_to_dB(v)/20);
+}
+
+char *pa_cvolume_snprint(char *s, size_t l, const pa_cvolume *c) {
+    unsigned channel;
+    int first = 1;
+    char *e;
+    
+    assert(s);
+    assert(l > 0);
+    assert(c);
+
+    *(e = s) = 0;
+
+    for (channel = 0; channel < c->channels && l > 1; channel++) {
+        l -= snprintf(e, l, "%s%u: %3u%%",
+                      first ? "" : " ",
+                      channel,
+                      (c->values[channel]*100)/PA_VOLUME_NORM);
+
+        e = strchr(e, 0);
+        first = 0;
+    }
+
+    return s;
+}
+
+/** 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) {
+    unsigned c;
+    assert(a);
+
+    for (c = 0; c < a->channels; c++)
+        if (a->values[c] != v)
+            return 0;
+
+    return 1;
+}
+
+pa_cvolume *pa_sw_cvolume_multiply(pa_cvolume *dest, const pa_cvolume *a, const pa_cvolume *b) {
+    unsigned i;
+    
+    assert(dest);
+    assert(a);
+    assert(b);
+
+    for (i = 0; i < a->channels && i < b->channels && i < PA_CHANNELS_MAX; i++) {
+
+        dest->values[i] = pa_sw_volume_multiply(
+            i < a->channels ? a->values[i] : PA_VOLUME_NORM,
+            i < b->channels ? b->values[i] : PA_VOLUME_NORM);
+    }
+
+    dest->channels = i;
+
+    return dest;
+}
+
+int pa_cvolume_valid(const pa_cvolume *v) {
+    assert(v);
+
+    if (v->channels <= 0 || v->channels > PA_CHANNELS_MAX)
+        return 0;
+
+    return 1;
+}