From 7e5123705a4811d168890e35cff2354922777c71 Mon Sep 17 00:00:00 2001
From: Pierre Ossman <ossman@cendio.se>
Date: Tue, 21 Feb 2006 16:35:12 +0000
Subject: Hardware volume support on Windows.

git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@551 fefdeb5f-60dc-0310-8127-8f9354f1896f
---
 src/modules/module-waveout.c | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

(limited to 'src/modules/module-waveout.c')

diff --git a/src/modules/module-waveout.c b/src/modules/module-waveout.c
index 3a8600c7..2176e6e7 100644
--- a/src/modules/module-waveout.c
+++ b/src/modules/module-waveout.c
@@ -48,6 +48,8 @@ PA_MODULE_USAGE("sink_name=<name for the sink> source_name=<name for the source>
 #define DEFAULT_SINK_NAME "wave_output"
 #define DEFAULT_SOURCE_NAME "wave_input"
 
+#define WAVEOUT_MAX_VOLUME 0xFFFF
+
 struct userdata {
     pa_sink *sink;
     pa_source *source;
@@ -336,6 +338,42 @@ static void notify_source_cb(pa_source *s) {
     u->core->mainloop->defer_enable(u->defer, 1);
 }
 
+static int sink_get_hw_volume_cb(pa_sink *s) {
+    struct userdata *u = s->userdata;
+    DWORD vol;
+    pa_volume_t left, right;
+
+    if (waveOutGetVolume(u->hwo, &vol) != MMSYSERR_NOERROR)
+        return -1;
+
+    left = (vol & 0xFFFF) * PA_VOLUME_NORM / WAVEOUT_MAX_VOLUME;
+    right = ((vol >> 16) & 0xFFFF) * PA_VOLUME_NORM / WAVEOUT_MAX_VOLUME;
+
+    /* Windows supports > 2 channels, except for volume control */
+    if (s->hw_volume.channels > 2)
+        pa_cvolume_set(&s->hw_volume, s->hw_volume.channels, (left + right)/2);
+
+    s->hw_volume.values[0] = left;
+    if (s->hw_volume.channels > 1)
+        s->hw_volume.values[1] = right;
+
+    return 0;
+}
+
+static int sink_set_hw_volume_cb(pa_sink *s) {
+    struct userdata *u = s->userdata;
+    DWORD vol;
+
+    vol = s->hw_volume.values[0] * WAVEOUT_MAX_VOLUME / PA_VOLUME_NORM;
+    if (s->hw_volume.channels > 1)
+        vol |= (s->hw_volume.values[0] * WAVEOUT_MAX_VOLUME / PA_VOLUME_NORM) << 16;
+
+    if (waveOutSetVolume(u->hwo, vol) != MMSYSERR_NOERROR)
+        return -1;
+
+    return 0;
+}
+
 static int ss_to_waveformat(pa_sample_spec *ss, LPWAVEFORMATEX wf) {
     wf->wFormatTag = WAVE_FORMAT_PCM;
 
@@ -455,6 +493,8 @@ int pa__init(pa_core *c, pa_module*m) {
         assert(u->sink);
         u->sink->notify = notify_sink_cb;
         u->sink->get_latency = sink_get_latency_cb;
+        u->sink->get_hw_volume = sink_get_hw_volume_cb;
+        u->sink->set_hw_volume = sink_set_hw_volume_cb;
         u->sink->userdata = u;
         pa_sink_set_owner(u->sink, m);
         u->sink->description = pa_sprintf_malloc("Windows waveOut PCM");
-- 
cgit