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/**
* @file linux_volume_catcher.cpp
* @brief A Linux-specific, PulseAudio-specific hack to detect and volume-adjust new audio sources
*
* @cond
* $LicenseInfo:firstyear=2010&license=viewergpl$
*
* Copyright (c) 2010, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlife.com/developers/opensource/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at http://secondlife.com/developers/opensource/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
* @endcond
*/
#include "linden_common.h"
#include <glib.h>
#include <pulse/introspect.h>
#include <pulse/context.h>
#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 *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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