Bring back FMOD, to be used on Fedora only, though

https://megapahit.com/show_bug.cgi?id=64

Dullahan is still not working, something in webrtc-voice is breaking
it too. But at least we're halfway now that we don't have to use
Fedora's OpenAL that is in conflict with Dullahan/CEF.

1 files changed, 756 insertions, 0 deletions

diff --git a/indra/llaudio/llaudioengine_fmodstudio.cpp b/indra/llaudio/llaudioengine_fmodstudio.cpp
new file mode 100644
index 0000000000..b4e8407083
--- /dev/null
+++ b/indra/llaudio/llaudioengine_fmodstudio.cpp
@@ -0,0 +1,756 @@
+/**
+ * @file audioengine_fmodstudio.cpp
+ * @brief Implementation of LLAudioEngine class abstracting the audio
+ * support as a FMODSTUDIO implementation
+ *
+ * $LicenseInfo:firstyear=2020&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2020, Linden Research, Inc.
+ *
+ * This library 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;
+ * version 2.1 of the License only.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#include "linden_common.h"
+
+#include "llstreamingaudio.h"
+#include "llstreamingaudio_fmodstudio.h"
+
+#include "llaudioengine_fmodstudio.h"
+#include "lllistener_fmodstudio.h"
+
+#include "llerror.h"
+#include "llmath.h"
+#include "llrand.h"
+
+#include "fmodstudio/fmod.hpp"
+#include "fmodstudio/fmod_errors.h"
+#include "lldir.h"
+#include "llapr.h"
+
+#include "sound_ids.h"
+
+FMOD_RESULT F_CALLBACK windCallback(FMOD_DSP_STATE *dsp_state, float *inbuffer, float *outbuffer, unsigned int length, int inchannels, int *outchannels);
+
+FMOD::ChannelGroup *LLAudioEngine_FMODSTUDIO::mChannelGroups[LLAudioEngine::AUDIO_TYPE_COUNT] = {0};
+
+LLAudioEngine_FMODSTUDIO::LLAudioEngine_FMODSTUDIO(bool enable_profiler)
+:   mInited(false),
+    mWindGen(NULL),
+    mWindDSP(NULL),
+    mSystem(NULL),
+    mEnableProfiler(enable_profiler),
+    mWindDSPDesc(NULL)
+{
+}
+
+
+LLAudioEngine_FMODSTUDIO::~LLAudioEngine_FMODSTUDIO()
+{
+    // mWindDSPDesc, mWindGen and mWindDSP get cleaned up on cleanupWind in LLAudioEngine::shutdown()
+    // mSystem gets cleaned up at shutdown()
+}
+
+
+static inline bool Check_FMOD_Error(FMOD_RESULT result, const char *string)
+{
+    if (result == FMOD_OK)
+        return false;
+    LL_DEBUGS("FMOD") << string << " Error: " << FMOD_ErrorString(result) << LL_ENDL;
+    return true;
+}
+
+bool LLAudioEngine_FMODSTUDIO::init(void* userdata, const std::string &app_title)
+{
+    U32 version;
+    FMOD_RESULT result;
+
+    LL_DEBUGS("AppInit") << "LLAudioEngine_FMODSTUDIO::init() initializing FMOD" << LL_ENDL;
+
+    result = FMOD::System_Create(&mSystem);
+    if (Check_FMOD_Error(result, "FMOD::System_Create"))
+        return false;
+
+    //will call LLAudioEngine_FMODSTUDIO::allocateListener, which needs a valid mSystem pointer.
+    LLAudioEngine::init(userdata, app_title);
+
+    result = mSystem->getVersion(&version);
+    Check_FMOD_Error(result, "FMOD::System::getVersion");
+
+    if (version < FMOD_VERSION)
+    {
+        LL_WARNS("AppInit") << "FMOD Studio version mismatch, actual: " << version
+            << " expected:" << FMOD_VERSION << LL_ENDL;
+    }
+
+    // In this case, all sounds, PLUS wind and stream will be software.
+    result = mSystem->setSoftwareChannels(LL_MAX_AUDIO_CHANNELS + 2);
+    Check_FMOD_Error(result, "FMOD::System::setSoftwareChannels");
+
+    FMOD_ADVANCEDSETTINGS settings;
+    memset(&settings, 0, sizeof(settings));
+    settings.cbSize = sizeof(FMOD_ADVANCEDSETTINGS);
+    settings.resamplerMethod = FMOD_DSP_RESAMPLER_LINEAR;
+
+    result = mSystem->setAdvancedSettings(&settings);
+    Check_FMOD_Error(result, "FMOD::System::setAdvancedSettings");
+
+    // FMOD_INIT_THREAD_UNSAFE Disables thread safety for API calls.
+    // Only use this if FMOD is being called from a single thread, and if Studio API is not being used.
+    U32 fmod_flags = FMOD_INIT_NORMAL | FMOD_INIT_3D_RIGHTHANDED | FMOD_INIT_THREAD_UNSAFE;
+    if (mEnableProfiler)
+    {
+        fmod_flags |= FMOD_INIT_PROFILE_ENABLE;
+    }
+
+#if LL_LINUX
+    bool audio_ok = false;
+
+    if (!audio_ok)
+    {
+        const char* env_string = getenv("LL_BAD_FMOD_PULSEAUDIO");
+        if (NULL == env_string)
+        {
+            LL_DEBUGS("AppInit") << "Trying PulseAudio audio output..." << LL_ENDL;
+            if (mSystem->setOutput(FMOD_OUTPUTTYPE_PULSEAUDIO) == FMOD_OK &&
+                (result = mSystem->init(LL_MAX_AUDIO_CHANNELS + 2, fmod_flags, const_cast<char*>(app_title.c_str()))) == FMOD_OK)
+            {
+                LL_DEBUGS("AppInit") << "PulseAudio output initialized OKAY" << LL_ENDL;
+                audio_ok = true;
+            }
+            else
+            {
+                Check_FMOD_Error(result, "PulseAudio audio output FAILED to initialize");
+            }
+        }
+        else
+        {
+            LL_DEBUGS("AppInit") << "PulseAudio audio output SKIPPED" << LL_ENDL;
+        }
+    }
+    if (!audio_ok)
+    {
+        const char* env_string = getenv("LL_BAD_FMOD_ALSA");
+        if (NULL == env_string)
+        {
+            LL_DEBUGS("AppInit") << "Trying ALSA audio output..." << LL_ENDL;
+            if (mSystem->setOutput(FMOD_OUTPUTTYPE_ALSA) == FMOD_OK &&
+                (result = mSystem->init(LL_MAX_AUDIO_CHANNELS + 2, fmod_flags, 0)) == FMOD_OK)
+            {
+                LL_DEBUGS("AppInit") << "ALSA audio output initialized OKAY" << LL_ENDL;
+                audio_ok = true;
+            }
+            else
+            {
+                Check_FMOD_Error(result, "ALSA audio output FAILED to initialize");
+            }
+        }
+        else
+        {
+            LL_DEBUGS("AppInit") << "ALSA audio output SKIPPED" << LL_ENDL;
+        }
+    }
+    if (!audio_ok)
+    {
+        LL_WARNS("AppInit") << "Overall audio init failure." << LL_ENDL;
+        return false;
+    }
+
+    // We're interested in logging which output method we
+    // ended up with, for QA purposes.
+    FMOD_OUTPUTTYPE output_type;
+    mSystem->getOutput(&output_type);
+    switch (output_type)
+    {
+    case FMOD_OUTPUTTYPE_NOSOUND:
+        LL_INFOS("AppInit") << "Audio output: NoSound" << LL_ENDL; break;
+    case FMOD_OUTPUTTYPE_PULSEAUDIO:
+        LL_INFOS("AppInit") << "Audio output: PulseAudio" << LL_ENDL; break;
+    case FMOD_OUTPUTTYPE_ALSA:
+        LL_INFOS("AppInit") << "Audio output: ALSA" << LL_ENDL; break;
+    default:
+        LL_INFOS("AppInit") << "Audio output: Unknown!" << LL_ENDL; break;
+    };
+#else // LL_LINUX
+
+    // initialize the FMOD engine
+    // number of channel in this case looks to be identiacal to number of max simultaneously
+    // playing objects and we can set practically any number
+    result = mSystem->init(LL_MAX_AUDIO_CHANNELS + 2, fmod_flags, 0);
+    if (Check_FMOD_Error(result, "Error initializing FMOD Studio with default settins, retrying with other format"))
+    {
+        result = mSystem->setSoftwareFormat(44100, FMOD_SPEAKERMODE_STEREO, 0/*- ignore*/);
+        if (Check_FMOD_Error(result, "Error setting sotware format. Can't init."))
+        {
+            return false;
+        }
+        result = mSystem->init(LL_MAX_AUDIO_CHANNELS + 2, fmod_flags, 0);
+    }
+    if (Check_FMOD_Error(result, "Error initializing FMOD Studio"))
+    {
+        // If it fails here and (result == FMOD_ERR_OUTPUT_CREATEBUFFER),
+        // we can retry with other settings
+        return false;
+    }
+#endif
+
+    LL_INFOS("AppInit") << "LLAudioEngine_FMODSTUDIO::init() FMOD Studio initialized correctly" << LL_ENDL;
+
+    int r_numbuffers, r_samplerate, r_channels;
+    unsigned int r_bufferlength;
+    char r_name[512];
+    int latency = 100;
+    mSystem->getDSPBufferSize(&r_bufferlength, &r_numbuffers);
+    LL_INFOS("AppInit") << "LLAudioEngine_FMODSTUDIO::init(): r_bufferlength=" << r_bufferlength << " bytes" << LL_ENDL;
+    LL_INFOS("AppInit") << "LLAudioEngine_FMODSTUDIO::init(): r_numbuffers=" << r_numbuffers << LL_ENDL;
+
+    mSystem->getDriverInfo(0, r_name, 511, NULL, &r_samplerate, NULL, &r_channels);
+    r_name[511] = '\0';
+    LL_INFOS("AppInit") << "LLAudioEngine_FMODSTUDIO::init(): r_name=\"" << r_name << "\"" << LL_ENDL;
+
+    if (r_samplerate != 0)
+        latency = (int)(1000.0f * r_bufferlength * r_numbuffers / r_samplerate);
+    LL_INFOS("AppInit") << "LLAudioEngine_FMODSTUDIO::init(): latency=" << latency << "ms" << LL_ENDL;
+
+    mInited = true;
+
+    LL_INFOS("AppInit") << "LLAudioEngine_FMODSTUDIO::init(): initialization complete." << LL_ENDL;
+
+    return true;
+}
+
+
+std::string LLAudioEngine_FMODSTUDIO::getDriverName(bool verbose)
+{
+    llassert_always(mSystem);
+    if (verbose)
+    {
+        U32 version;
+        if (!Check_FMOD_Error(mSystem->getVersion(&version), "FMOD::System::getVersion"))
+        {
+            return llformat("FMOD Studio %1x.%02x.%02x (Firelight Technologies Pty Ltd)", version >> 16, version >> 8 & 0x000000FF, version & 0x000000FF);
+        }
+    }
+    return "FMOD STUDIO";
+}
+
+
+// create our favourite FMOD-native streaming audio implementation
+LLStreamingAudioInterface *LLAudioEngine_FMODSTUDIO::createDefaultStreamingAudioImpl() const
+{
+    return new LLStreamingAudio_FMODSTUDIO(mSystem);
+}
+
+
+void LLAudioEngine_FMODSTUDIO::allocateListener(void)
+{
+    mListenerp = (LLListener *) new LLListener_FMODSTUDIO(mSystem);
+    if (!mListenerp)
+    {
+        LL_WARNS("FMOD") << "Listener creation failed" << LL_ENDL;
+    }
+}
+
+
+void LLAudioEngine_FMODSTUDIO::shutdown()
+{
+    stopInternetStream();
+
+    LL_INFOS("FMOD") << "About to LLAudioEngine::shutdown()" << LL_ENDL;
+    LLAudioEngine::shutdown();
+
+    LL_INFOS("FMOD") << "LLAudioEngine_FMODSTUDIO::shutdown() closing FMOD Studio" << LL_ENDL;
+    if (mSystem)
+    {
+        mSystem->close();
+        mSystem->release();
+    }
+    LL_INFOS("FMOD") << "LLAudioEngine_FMODSTUDIO::shutdown() done closing FMOD Studio" << LL_ENDL;
+
+    delete mListenerp;
+    mListenerp = NULL;
+}
+
+
+LLAudioBuffer * LLAudioEngine_FMODSTUDIO::createBuffer()
+{
+    return new LLAudioBufferFMODSTUDIO(mSystem);
+}
+
+
+LLAudioChannel * LLAudioEngine_FMODSTUDIO::createChannel()
+{
+    return new LLAudioChannelFMODSTUDIO(mSystem);
+}
+
+bool LLAudioEngine_FMODSTUDIO::initWind()
+{
+    mNextWindUpdate = 0.0;
+
+    if (!mWindDSPDesc)
+    {
+        mWindDSPDesc = new FMOD_DSP_DESCRIPTION();
+    }
+
+    if (!mWindDSP)
+    {
+        memset(mWindDSPDesc, 0, sizeof(*mWindDSPDesc)); //Set everything to zero
+        strncpy(mWindDSPDesc->name, "Wind Unit", sizeof(mWindDSPDesc->name));
+        mWindDSPDesc->pluginsdkversion = FMOD_PLUGIN_SDK_VERSION;
+        mWindDSPDesc->read = &windCallback; // Assign callback - may be called from arbitrary threads
+        if (Check_FMOD_Error(mSystem->createDSP(mWindDSPDesc, &mWindDSP), "FMOD::createDSP"))
+            return false;
+
+        if (mWindGen)
+            delete mWindGen;
+
+        int frequency = 44100;
+
+        FMOD_SPEAKERMODE mode;
+        if (Check_FMOD_Error(mSystem->getSoftwareFormat(&frequency, &mode, nullptr), "FMOD::System::getSoftwareFormat"))
+        {
+            cleanupWind();
+            return false;
+        }
+
+        mWindGen = new LLWindGen<MIXBUFFERFORMAT>((U32)frequency);
+
+        if (Check_FMOD_Error(mWindDSP->setUserData((void*)mWindGen), "FMOD::DSP::setUserData"))
+        {
+            cleanupWind();
+            return false;
+        }
+        if (Check_FMOD_Error(mWindDSP->setChannelFormat(FMOD_CHANNELMASK_STEREO, 2, mode), "FMOD::DSP::setChannelFormat"))
+        {
+            cleanupWind();
+            return false;
+        }
+    }
+
+    // *TODO:  Should this guard against multiple plays?
+    if (Check_FMOD_Error(mSystem->playDSP(mWindDSP, nullptr, false, nullptr), "FMOD::System::playDSP"))
+    {
+        cleanupWind();
+        return false;
+    }
+    return true;
+}
+
+
+void LLAudioEngine_FMODSTUDIO::cleanupWind()
+{
+    if (mWindDSP)
+    {
+        FMOD::ChannelGroup* master_group = NULL;
+        if (!Check_FMOD_Error(mSystem->getMasterChannelGroup(&master_group), "FMOD::System::getMasterChannelGroup")
+            && master_group)
+        {
+            master_group->removeDSP(mWindDSP);
+        }
+        mWindDSP->release();
+        mWindDSP = NULL;
+    }
+
+    delete mWindDSPDesc;
+    mWindDSPDesc = NULL;
+
+    delete mWindGen;
+    mWindGen = NULL;
+}
+
+
+//-----------------------------------------------------------------------
+void LLAudioEngine_FMODSTUDIO::updateWind(LLVector3 wind_vec, F32 camera_height_above_water)
+{
+    LLVector3 wind_pos;
+    F64 pitch;
+    F64 center_freq;
+
+    if (!mEnableWind)
+    {
+        return;
+    }
+
+    if (mWindUpdateTimer.checkExpirationAndReset(LL_WIND_UPDATE_INTERVAL))
+    {
+
+        // wind comes in as Linden coordinate (+X = forward, +Y = left, +Z = up)
+        // need to convert this to the conventional orientation DS3D and OpenAL use
+        // where +X = right, +Y = up, +Z = backwards
+
+        wind_vec.setVec(-wind_vec.mV[1], wind_vec.mV[2], -wind_vec.mV[0]);
+
+        // cerr << "Wind update" << endl;
+
+        pitch = 1.0 + mapWindVecToPitch(wind_vec);
+        center_freq = 80.0 * pow(pitch, 2.5*(mapWindVecToGain(wind_vec) + 1.0));
+
+        mWindGen->mTargetFreq = (F32)center_freq;
+        mWindGen->mTargetGain = (F32)mapWindVecToGain(wind_vec) * mMaxWindGain;
+        mWindGen->mTargetPanGainR = (F32)mapWindVecToPan(wind_vec);
+    }
+}
+
+//-----------------------------------------------------------------------
+void LLAudioEngine_FMODSTUDIO::setInternalGain(F32 gain)
+{
+    if (!mInited)
+    {
+        return;
+    }
+
+    gain = llclamp(gain, 0.0f, 1.0f);
+
+    FMOD::ChannelGroup* master_group = NULL;
+    if (!Check_FMOD_Error(mSystem->getMasterChannelGroup(&master_group), "FMOD::System::getMasterChannelGroup")
+        && master_group)
+    {
+        master_group->setVolume(gain);
+    }
+
+    LLStreamingAudioInterface *saimpl = getStreamingAudioImpl();
+    if (saimpl)
+    {
+        // fmod likes its streaming audio channel gain re-asserted after
+        // master volume change.
+        saimpl->setGain(saimpl->getGain());
+    }
+}
+
+//
+// LLAudioChannelFMODSTUDIO implementation
+//
+
+LLAudioChannelFMODSTUDIO::LLAudioChannelFMODSTUDIO(FMOD::System *system) : LLAudioChannel(), mSystemp(system), mChannelp(NULL), mLastSamplePos(0)
+{
+}
+
+
+LLAudioChannelFMODSTUDIO::~LLAudioChannelFMODSTUDIO()
+{
+    cleanup();
+}
+
+bool LLAudioChannelFMODSTUDIO::updateBuffer()
+{
+    if (!mCurrentSourcep)
+    {
+        // This channel isn't associated with any source, nothing
+        // to be updated
+        return false;
+    }
+
+    if (LLAudioChannel::updateBuffer())
+    {
+        // Base class update returned true, which means that we need to actually
+        // set up the channel for a different buffer.
+
+        LLAudioBufferFMODSTUDIO *bufferp = (LLAudioBufferFMODSTUDIO *)mCurrentSourcep->getCurrentBuffer();
+
+        // Grab the FMOD sample associated with the buffer
+        FMOD::Sound *soundp = bufferp->getSound();
+        if (!soundp)
+        {
+            // This is bad, there should ALWAYS be a sound associated with a legit
+            // buffer.
+            LL_ERRS() << "No FMOD sound!" << LL_ENDL;
+            return false;
+        }
+
+
+        // Actually play the sound.  Start it off paused so we can do all the necessary
+        // setup.
+        if (!mChannelp)
+        {
+            FMOD_RESULT result = getSystem()->playSound(soundp, NULL /*free channel?*/, true, &mChannelp);
+            Check_FMOD_Error(result, "FMOD::System::playSound");
+        }
+
+        // Setting up channel mChannelID
+    }
+
+    // If we have a source for the channel, we need to update its gain.
+    if (mCurrentSourcep)
+    {
+        // SJB: warnings can spam and hurt framerate, disabling
+        //FMOD_RESULT result;
+
+        mChannelp->setVolume(getSecondaryGain() * mCurrentSourcep->getGain());
+        //Check_FMOD_Error(result, "FMOD::Channel::setVolume");
+
+        mChannelp->setMode(mCurrentSourcep->isLoop() ? FMOD_LOOP_NORMAL : FMOD_LOOP_OFF);
+        /*if(Check_FMOD_Error(result, "FMOD::Channel::setMode"))
+        {
+        S32 index;
+        mChannelp->getIndex(&index);
+        LL_WARNS() << "Channel " << index << "Source ID: " << mCurrentSourcep->getID()
+        << " at " << mCurrentSourcep->getPositionGlobal() << LL_ENDL;
+        }*/
+    }
+
+    return true;
+}
+
+
+void LLAudioChannelFMODSTUDIO::update3DPosition()
+{
+    if (!mChannelp)
+    {
+        // We're not actually a live channel (i.e., we're not playing back anything)
+        return;
+    }
+
+    LLAudioBufferFMODSTUDIO  *bufferp = (LLAudioBufferFMODSTUDIO  *)mCurrentBufferp;
+    if (!bufferp)
+    {
+        // We don't have a buffer associated with us (should really have been picked up
+        // by the above if.
+        return;
+    }
+
+    if (mCurrentSourcep->isForcedPriority())
+    {
+        // Prioritized UI and preview sounds don't need to do any positional updates.
+        set3DMode(false);
+    }
+    else
+    {
+        // Localized sound.  Update the position and velocity of the sound.
+        set3DMode(true);
+
+        LLVector3 float_pos;
+        float_pos.setVec(mCurrentSourcep->getPositionGlobal());
+        FMOD_RESULT result = mChannelp->set3DAttributes((FMOD_VECTOR*)float_pos.mV, (FMOD_VECTOR*)mCurrentSourcep->getVelocity().mV);
+        Check_FMOD_Error(result, "FMOD::Channel::set3DAttributes");
+    }
+}
+
+
+void LLAudioChannelFMODSTUDIO::updateLoop()
+{
+    if (!mChannelp)
+    {
+        // May want to clear up the loop/sample counters.
+        return;
+    }
+
+    //
+    // Hack:  We keep track of whether we looped or not by seeing when the
+    // sample position looks like it's going backwards.  Not reliable; may
+    // yield false negatives.
+    //
+    U32 cur_pos;
+    mChannelp->getPosition(&cur_pos, FMOD_TIMEUNIT_PCMBYTES);
+
+    if (cur_pos < (U32)mLastSamplePos)
+    {
+        mLoopedThisFrame = true;
+    }
+    mLastSamplePos = cur_pos;
+}
+
+
+void LLAudioChannelFMODSTUDIO::cleanup()
+{
+    if (!mChannelp)
+    {
+        // Aborting cleanup with no channel handle.
+        return;
+    }
+
+    //Cleaning up channel mChannelID
+    Check_FMOD_Error(mChannelp->stop(), "FMOD::Channel::stop");
+
+    mCurrentBufferp = NULL;
+    mChannelp = NULL;
+}
+
+
+void LLAudioChannelFMODSTUDIO::play()
+{
+    if (!mChannelp)
+    {
+        LL_WARNS() << "Playing without a channel handle, aborting" << LL_ENDL;
+        return;
+    }
+
+    Check_FMOD_Error(mChannelp->setPaused(false), "FMOD::Channel::pause");
+
+    getSource()->setPlayedOnce(true);
+
+    if (LLAudioEngine_FMODSTUDIO::mChannelGroups[getSource()->getType()])
+        mChannelp->setChannelGroup(LLAudioEngine_FMODSTUDIO::mChannelGroups[getSource()->getType()]);
+}
+
+
+void LLAudioChannelFMODSTUDIO::playSynced(LLAudioChannel *channelp)
+{
+    LLAudioChannelFMODSTUDIO *fmod_channelp = (LLAudioChannelFMODSTUDIO*)channelp;
+    if (!(fmod_channelp->mChannelp && mChannelp))
+    {
+        // Don't have channels allocated to both the master and the slave
+        return;
+    }
+
+    U32 cur_pos;
+    if (Check_FMOD_Error(mChannelp->getPosition(&cur_pos, FMOD_TIMEUNIT_PCMBYTES), "Unable to retrieve current position"))
+        return;
+
+    cur_pos %= mCurrentBufferp->getLength();
+
+    // Try to match the position of our sync master
+    Check_FMOD_Error(mChannelp->setPosition(cur_pos, FMOD_TIMEUNIT_PCMBYTES), "Unable to set current position");
+
+    // Start us playing
+    play();
+}
+
+
+bool LLAudioChannelFMODSTUDIO::isPlaying()
+{
+    if (!mChannelp)
+    {
+        return false;
+    }
+
+    bool paused, playing;
+    mChannelp->getPaused(&paused);
+    mChannelp->isPlaying(&playing);
+    return !paused && playing;
+}
+
+
+//
+// LLAudioChannelFMODSTUDIO implementation
+//
+
+
+LLAudioBufferFMODSTUDIO::LLAudioBufferFMODSTUDIO(FMOD::System *system) : mSystemp(system), mSoundp(NULL)
+{
+}
+
+
+LLAudioBufferFMODSTUDIO::~LLAudioBufferFMODSTUDIO()
+{
+    if (mSoundp)
+    {
+        mSoundp->release();
+        mSoundp = NULL;
+    }
+}
+
+
+bool LLAudioBufferFMODSTUDIO::loadWAV(const std::string& filename)
+{
+    // Try to open a wav file from disk.  This will eventually go away, as we don't
+    // really want to block doing this.
+    if (filename.empty())
+    {
+        // invalid filename, abort.
+        return false;
+    }
+
+    if (!gDirUtilp->fileExists(filename))
+    {
+        // File not found, abort.
+        return false;
+    }
+
+    if (mSoundp)
+    {
+        // If there's already something loaded in this buffer, clean it up.
+        mSoundp->release();
+        mSoundp = NULL;
+    }
+
+    FMOD_MODE base_mode = FMOD_LOOP_NORMAL;
+    FMOD_CREATESOUNDEXINFO exinfo;
+    memset(&exinfo, 0, sizeof(exinfo));
+    exinfo.cbsize = sizeof(exinfo);
+    exinfo.suggestedsoundtype = FMOD_SOUND_TYPE_WAV;    //Hint to speed up loading.
+    // Load up the wav file into an fmod sample (since 1.05 fmod studio expects everything in UTF-8)
+    FMOD_RESULT result = getSystem()->createSound(filename.c_str(), base_mode, &exinfo, &mSoundp);
+
+    if (result != FMOD_OK)
+    {
+        // We failed to load the file for some reason.
+        LL_WARNS() << "Could not load data '" << filename << "': " << FMOD_ErrorString(result) << LL_ENDL;
+
+        //
+        // If we EVER want to load wav files provided by end users, we need
+        // to rethink this!
+        //
+        // file is probably corrupt - remove it.
+        LLFile::remove(filename);
+        return false;
+    }
+
+    // Everything went well, return true
+    return true;
+}
+
+
+U32 LLAudioBufferFMODSTUDIO::getLength()
+{
+    if (!mSoundp)
+    {
+        return 0;
+    }
+
+    U32 length;
+    mSoundp->getLength(&length, FMOD_TIMEUNIT_PCMBYTES);
+    return length;
+}
+
+
+void LLAudioChannelFMODSTUDIO::set3DMode(bool use3d)
+{
+    FMOD_MODE current_mode;
+    if (mChannelp->getMode(&current_mode) != FMOD_OK)
+        return;
+    FMOD_MODE new_mode = current_mode;
+    new_mode &= ~(use3d ? FMOD_2D : FMOD_3D);
+    new_mode |= use3d ? FMOD_3D : FMOD_2D;
+
+    if (current_mode != new_mode)
+    {
+        mChannelp->setMode(new_mode);
+    }
+}
+
+// *NOTE:  This is almost certainly being called on the mixer thread,
+// not the main thread.  May have implications for callees or audio
+// engine shutdown.
+
+FMOD_RESULT F_CALLBACK windCallback(FMOD_DSP_STATE *dsp_state, float *inbuffer, float *outbuffer, unsigned int length, int inchannels, int *outchannels)
+{
+    // inbuffer = fmod's original mixbuffer.
+    // outbuffer = the buffer passed from the previous DSP unit.
+    // length = length in samples at this mix time.
+
+    LLWindGen<LLAudioEngine_FMODSTUDIO::MIXBUFFERFORMAT> *windgen = NULL;
+    FMOD::DSP *thisdsp = (FMOD::DSP *)dsp_state->instance;
+
+    thisdsp->getUserData((void **)&windgen);
+
+    if (windgen)
+    {
+        windgen->windGenerate((LLAudioEngine_FMODSTUDIO::MIXBUFFERFORMAT *)outbuffer, length);
+    }
+
+    return FMOD_OK;
+}