From a273cc426744fc0d3eb3f794862667ea65af9e15 Mon Sep 17 00:00:00 2001
From: Christian Gmeiner <christian.gmeiner@gmail.com>
Date: Fri, 5 Feb 2010 13:18:48 +0100
Subject: better user experience when switching channel

---
 dxr3device.c | 17 +++++++++++++++++
 dxr3device.h |  2 ++
 2 files changed, 19 insertions(+)

diff --git a/dxr3device.c b/dxr3device.c
index 253a09d..4c06bf2 100644
--- a/dxr3device.c
+++ b/dxr3device.c
@@ -34,10 +34,19 @@ static const char *DEV_DXR3_OSD   = "_sp";
 static const char *DEV_DXR3_VIDEO = "_mv";
 static const char *DEV_DXR3_CONT  = "";
 
+static const int SILENT_AUDIO_SIZE = 16384;
+
 cDxr3Device::cDxr3Device() : pluginOn(true), vPts(0), scrSet(false), playCount(0)
 {
     m_spuDecoder = NULL;
 
+    silentAudio = new uchar[SILENT_AUDIO_SIZE];
+
+    if (!silentAudio) {
+        esyslog("[dxr3-device] failed to allocate silent audio data");
+        exit(-2);
+    }
+
     claimDevices();
 
     if (cSettings::instance()->audioDriver() == OSS) {
@@ -57,6 +66,7 @@ cDxr3Device::~cDxr3Device()
     audioOut->releaseDevice();
     delete audioOut;
     delete aDecoder;
+    delete[] silentAudio;
 
     releaseDevices();
 
@@ -114,6 +124,8 @@ bool cDxr3Device::SetPlayMode(ePlayMode PlayMode)
 
     switch (PlayMode) {
     case pmNone:
+        playSilentAudio();
+        playBlackFrame();
         audioOut->setEnabled(false);
         scrSet = false;
         playCount = 0;
@@ -540,6 +552,11 @@ void cDxr3Device::playBlackFrame()
     vertical = 576;
 }
 
+void cDxr3Device::playSilentAudio()
+{
+    audioOut->write(silentAudio, SILENT_AUDIO_SIZE);
+}
+
 // Local variables:
 // mode: c++
 // c-file-style: "stroustrup"
diff --git a/dxr3device.h b/dxr3device.h
index f6eefdb..7aecd98 100644
--- a/dxr3device.h
+++ b/dxr3device.h
@@ -105,7 +105,9 @@ private:
     void setPlayMode();
     void playVideoFrame(cDxr3PesFrame *frame, uint32_t pts);
     void playBlackFrame();
+    void playSilentAudio();
 
+    uchar *silentAudio;
     cDxr3AudioDecoder *aDecoder;
     cDxr3SpuDecoder* m_spuDecoder;
     iAudio *audioOut;
-- 
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