From 9c66a9b6eb18276823a91e344a82787149ad7c15 Mon Sep 17 00:00:00 2001
From: Tofu Linden <tofu.linden@lindenlab.com>
Date: Mon, 22 Feb 2010 13:12:44 +0000
Subject: Really start to fill the implementation in.

---
 .../media_plugins/webkit/linux_volume_catcher.cpp  | 141 ++++++++++++++++++++-
 1 file changed, 140 insertions(+), 1 deletion(-)

(limited to 'indra')

diff --git a/indra/media_plugins/webkit/linux_volume_catcher.cpp b/indra/media_plugins/webkit/linux_volume_catcher.cpp
index 8d8600c344..43731fe8d0 100644
--- a/indra/media_plugins/webkit/linux_volume_catcher.cpp
+++ b/indra/media_plugins/webkit/linux_volume_catcher.cpp
@@ -40,19 +40,158 @@
 #include <pulse/subscribe.h>
 #include <pulse/glib-mainloop.h> // There's no special reason why we want the *glib* PA mainloop, but the generic polling implementation seems broken.
 
+#include "linux_volume_catcher.h"
+
+////////////////////////////////////////////////////
+
+LinuxVolumeCatcher::LinuxVolumeCatcher()
+{
+	pimpl = new LinuxVolumeCatcherImpl();
+}
+
+LinuxVolumeCatcher::LinuxVolumeCatcher~()
+{
+	delete pimpl;
+	pimpl = NULL;
+}
+
+void LinuxVolumeCatcher::setVol(F32 volume)
+{
+	llassert(pimpl);
+	pimpl->setVol(volume);
+}
+
+void LinuxVolumeCatcher::pump()
+{
+	llassert(pimpl);
+	pimpl->pump();
+}
+
+/////////////////////////////////////////////////////
+
+// PulseAudio requires a chain of callbacks with C linkage
+extern "C" {
+	void callback_discovered_sinkinput(pa_context *context, const pa_sink_input_info *i, int eol, void *userdata);
+	void callback_subscription_alert(pa_context *context, pa_subscription_event_type_t t, uint32_t index, void *userdata);
+	void callback_context_state(pa_context *context, void *userdata);
+}
+
+
 class LinuxVolumeCatcherImpl
 {
 public:
+	LinuxVolumeCatcherImpl();
+	~LinuxVolumeCatcherImpl();
+
 	void setVol(F32 volume);
 	void pump(void);
 
 private:
+	void init();
+	void cleanup();
+
+	void connected_okay();
+	void update_index_volume(F32 volume);
+	void update_all_volumes(F32 volume);
+
 	F32 mDesiredVolume;
 	pa_glib_mainloop *mMainloop;
-	pa_context *mLastContext;
+	pa_context *mPAContext;
 	bool connected;
 	std::set<U32> mSinkInputIndices;
 	std::map<U32,U32> mSinkInputNumChannels;
+};
+
+LinuxVolumeCatcherImpl::LinuxVolumeCatcherImpl()
+	: mDesiredVolume(0.0f),
+	  mMainloop(NULL),
+	  mPAContext(NULL),
+	  mConnected(false)
+{
+	init();
 }
 
+LinuxVolumeCatcherImpl::~LinuxVolumeCatcherImpl()
+{
+	cleanup();
+}
+
+LinuxVolumeCatcherImpl::init()
+{
+	// try to be as robust as possible because PA's interface is a
+	// bit fragile and (for our purposes) we'd rather simply not function
+	// than crash
+	mMainloop = pa_glib_mainloop_new(g_main_context_default());
+	if (mMainloop)
+	{
+		pa_mainloop_api *api = pa_glib_mainloop_get_api(mMainloop);
+		if (api)
+		{
+			pa_proplist *proplist = pa_proplist_new();
+			if (proplist)
+			{
+				pa_proplist_sets(proplist, PA_PROP_APPLICATION_ICON_NAME, "multimedia-player");
+				pa_proplist_sets(proplist, PA_PROP_APPLICATION_ID, "com.secondlife.viewer.mediaplugvoladjust");
+				pa_proplist_sets(proplist, PA_PROP_APPLICATION_NAME, "SL Plugin Volume Adjuster");
+				pa_proplist_sets(proplist, PA_PROP_APPLICATION_VERSION, "1");
+
+				// plain old pa_context_new() is broken!
+				mPAContext = pa_context_new_with_proplist(api, NULL, proplist);
+				pa_proplist_free(proplist);
+			}
+		}
+	}
+
+	// Now we've set up a PA context and mainloop, try connecting the
+	// PA context to a PA daemon.
+	if (mPAContext)
+	{
+		pa_context_set_state_callback(mPAContext, callback_context_state, NULL);
+		pa_context_flags_t cflags = 0; // maybe add PA_CONTEXT_NOAUTOSPAWN?
+		if (pa_context_connect(mPAContext, NULL, cflags, NULL) >= 0)
+		{
+			// Okay!  We haven't definitely connected, but we
+			// haven't definitely failed yet.
+		}
+		else
+		{
+			// Failed to connect to PA manager... we'll leave
+			// things like that.  Perhaps we should try again later.
+		}
+	}
+}
+
+LinuxVolumeCatcherImpl::cleanup()
+{
+	// there's some cleanup we could do, but do nothing... for now.
+}
+
+LinuxVolumeCatcherImpl::setVol(F32 volume)
+{
+	mDesiredVolume = volume;
+	
+	if (mConnected && mPAContext)
+	{
+		update_all_volumes(mDesiredVolume);
+	}
+
+	pump();
+}
+
+LinuxVolumeCatcherImpl::pump()
+{
+	g_main_context_iteration(g_main_context_default());
+}
+
+void callback_discovered_sinkinput(pa_context *context, const pa_sink_input_info *i, int eol, void *userdata)
+{
+}
+
+void callback_subscription_alert(pa_context *context, pa_subscription_event_type_t t, uint32_t index, void *userdata)
+{
+}
+
+void callback_context_state(pa_context *context, void *userdata)
+{
+}
 
-- 
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