393 lines
9.2 KiB
C++
393 lines
9.2 KiB
C++
/**
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* @file streamingaudio_fmodex.cpp
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* @brief LLStreamingAudio_FMODEX implementation
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*
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* $LicenseInfo:firstyear=2002&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2010, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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* $/LicenseInfo$
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*/
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#include "linden_common.h"
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#include "llmath.h"
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#include "fmod.hpp"
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#include "fmod_errors.h"
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#include "llstreamingaudio_fmodex.h"
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class LLAudioStreamManagerFMODEX
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{
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public:
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LLAudioStreamManagerFMODEX(FMOD::System *system, const std::string& url);
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FMOD::Channel* startStream();
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bool stopStream(); // Returns true if the stream was successfully stopped.
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bool ready();
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const std::string& getURL() { return mInternetStreamURL; }
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FMOD_OPENSTATE getOpenState(unsigned int* percentbuffered=NULL, bool* starving=NULL, bool* diskbusy=NULL);
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protected:
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FMOD::System* mSystem;
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FMOD::Channel* mStreamChannel;
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FMOD::Sound* mInternetStream;
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bool mReady;
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std::string mInternetStreamURL;
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};
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//---------------------------------------------------------------------------
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// Internet Streaming
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//---------------------------------------------------------------------------
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LLStreamingAudio_FMODEX::LLStreamingAudio_FMODEX(FMOD::System *system) :
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mSystem(system),
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mCurrentInternetStreamp(NULL),
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mFMODInternetStreamChannelp(NULL),
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mGain(1.0f)
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{
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// Number of milliseconds of audio to buffer for the audio card.
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// Must be larger than the usual Second Life frame stutter time.
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const U32 buffer_seconds = 10; //sec
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const U32 estimated_bitrate = 128; //kbit/sec
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mSystem->setStreamBufferSize(estimated_bitrate * buffer_seconds * 128/*bytes/kbit*/, FMOD_TIMEUNIT_RAWBYTES);
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// Here's where we set the size of the network buffer and some buffering
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// parameters. In this case we want a network buffer of 16k, we want it
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// to prebuffer 40% of that when we first connect, and we want it
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// to rebuffer 80% of that whenever we encounter a buffer underrun.
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// Leave the net buffer properties at the default.
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//FSOUND_Stream_Net_SetBufferProperties(20000, 40, 80);
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}
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LLStreamingAudio_FMODEX::~LLStreamingAudio_FMODEX()
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{
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// nothing interesting/safe to do.
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}
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void LLStreamingAudio_FMODEX::start(const std::string& url)
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{
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//if (!mInited)
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//{
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// llwarns << "startInternetStream before audio initialized" << llendl;
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// return;
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//}
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// "stop" stream but don't clear url, etc. in case url == mInternetStreamURL
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stop();
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if (!url.empty())
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{
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llinfos << "Starting internet stream: " << url << llendl;
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mCurrentInternetStreamp = new LLAudioStreamManagerFMODEX(mSystem,url);
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mURL = url;
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}
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else
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{
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llinfos << "Set internet stream to null" << llendl;
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mURL.clear();
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}
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}
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void LLStreamingAudio_FMODEX::update()
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{
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// Kill dead internet streams, if possible
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std::list<LLAudioStreamManagerFMODEX *>::iterator iter;
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for (iter = mDeadStreams.begin(); iter != mDeadStreams.end();)
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{
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LLAudioStreamManagerFMODEX *streamp = *iter;
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if (streamp->stopStream())
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{
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llinfos << "Closed dead stream" << llendl;
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delete streamp;
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mDeadStreams.erase(iter++);
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}
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else
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{
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iter++;
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}
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}
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// Don't do anything if there are no streams playing
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if (!mCurrentInternetStreamp)
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{
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return;
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}
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unsigned int progress;
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bool starving;
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bool diskbusy;
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FMOD_OPENSTATE open_state = mCurrentInternetStreamp->getOpenState(&progress, &starving, &diskbusy);
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if (open_state == FMOD_OPENSTATE_READY)
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{
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// Stream is live
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// start the stream if it's ready
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if (!mFMODInternetStreamChannelp &&
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(mFMODInternetStreamChannelp = mCurrentInternetStreamp->startStream()))
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{
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// Reset volume to previously set volume
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setGain(getGain());
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mFMODInternetStreamChannelp->setPaused(false);
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}
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}
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else if(open_state == FMOD_OPENSTATE_ERROR)
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{
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stop();
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return;
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}
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if(mFMODInternetStreamChannelp)
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{
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FMOD::Sound *sound = NULL;
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if(mFMODInternetStreamChannelp->getCurrentSound(&sound) == FMOD_OK && sound)
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{
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FMOD_TAG tag;
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S32 tagcount, dirtytagcount;
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if(sound->getNumTags(&tagcount, &dirtytagcount) == FMOD_OK && dirtytagcount)
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{
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for(S32 i = 0; i < tagcount; ++i)
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{
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if(sound->getTag(NULL, i, &tag)!=FMOD_OK)
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continue;
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if (tag.type == FMOD_TAGTYPE_FMOD)
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{
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if (!strcmp(tag.name, "Sample Rate Change"))
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{
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llinfos << "Stream forced changing sample rate to " << *((float *)tag.data) << llendl;
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mFMODInternetStreamChannelp->setFrequency(*((float *)tag.data));
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}
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continue;
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}
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}
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}
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if(starving)
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{
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bool paused = false;
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mFMODInternetStreamChannelp->getPaused(&paused);
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if(!paused)
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{
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llinfos << "Stream starvation detected! Pausing stream until buffer nearly full." << llendl;
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llinfos << " (diskbusy="<<diskbusy<<")" << llendl;
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llinfos << " (progress="<<progress<<")" << llendl;
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mFMODInternetStreamChannelp->setPaused(true);
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}
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}
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else if(progress > 80)
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{
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mFMODInternetStreamChannelp->setPaused(false);
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}
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}
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}
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}
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void LLStreamingAudio_FMODEX::stop()
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{
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if (mFMODInternetStreamChannelp)
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{
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mFMODInternetStreamChannelp->setPaused(true);
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mFMODInternetStreamChannelp->setPriority(0);
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mFMODInternetStreamChannelp = NULL;
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}
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if (mCurrentInternetStreamp)
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{
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llinfos << "Stopping internet stream: " << mCurrentInternetStreamp->getURL() << llendl;
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if (mCurrentInternetStreamp->stopStream())
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{
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delete mCurrentInternetStreamp;
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}
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else
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{
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llwarns << "Pushing stream to dead list: " << mCurrentInternetStreamp->getURL() << llendl;
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mDeadStreams.push_back(mCurrentInternetStreamp);
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}
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mCurrentInternetStreamp = NULL;
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//mURL.clear();
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}
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}
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void LLStreamingAudio_FMODEX::pause(int pauseopt)
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{
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if (pauseopt < 0)
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{
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pauseopt = mCurrentInternetStreamp ? 1 : 0;
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}
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if (pauseopt)
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{
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if (mCurrentInternetStreamp)
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{
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stop();
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}
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}
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else
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{
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start(getURL());
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}
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}
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// A stream is "playing" if it has been requested to start. That
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// doesn't necessarily mean audio is coming out of the speakers.
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int LLStreamingAudio_FMODEX::isPlaying()
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{
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if (mCurrentInternetStreamp)
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{
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return 1; // Active and playing
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}
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else if (!mURL.empty())
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{
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return 2; // "Paused"
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}
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else
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{
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return 0;
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}
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}
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F32 LLStreamingAudio_FMODEX::getGain()
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{
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return mGain;
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}
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std::string LLStreamingAudio_FMODEX::getURL()
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{
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return mURL;
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}
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void LLStreamingAudio_FMODEX::setGain(F32 vol)
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{
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mGain = vol;
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if (mFMODInternetStreamChannelp)
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{
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vol = llclamp(vol * vol, 0.f, 1.f); //should vol be squared here?
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mFMODInternetStreamChannelp->setVolume(vol);
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}
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}
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///////////////////////////////////////////////////////
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// manager of possibly-multiple internet audio streams
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LLAudioStreamManagerFMODEX::LLAudioStreamManagerFMODEX(FMOD::System *system, const std::string& url) :
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mSystem(system),
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mStreamChannel(NULL),
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mInternetStream(NULL),
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mReady(false)
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{
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mInternetStreamURL = url;
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FMOD_RESULT result = mSystem->createStream(url.c_str(), FMOD_2D | FMOD_NONBLOCKING | FMOD_IGNORETAGS, 0, &mInternetStream);
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if (result!= FMOD_OK)
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{
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llwarns << "Couldn't open fmod stream, error "
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<< FMOD_ErrorString(result)
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<< llendl;
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mReady = false;
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return;
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}
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mReady = true;
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}
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FMOD::Channel *LLAudioStreamManagerFMODEX::startStream()
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{
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// We need a live and opened stream before we try and play it.
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if (!mInternetStream || getOpenState() != FMOD_OPENSTATE_READY)
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{
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llwarns << "No internet stream to start playing!" << llendl;
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return NULL;
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}
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if(mStreamChannel)
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return mStreamChannel; //Already have a channel for this stream.
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mSystem->playSound(FMOD_CHANNEL_FREE, mInternetStream, true, &mStreamChannel);
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return mStreamChannel;
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}
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bool LLAudioStreamManagerFMODEX::stopStream()
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{
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if (mInternetStream)
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{
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bool close = true;
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switch (getOpenState())
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{
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case FMOD_OPENSTATE_CONNECTING:
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close = false;
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break;
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default:
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close = true;
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}
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if (close)
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{
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mInternetStream->release();
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mStreamChannel = NULL;
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mInternetStream = NULL;
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return true;
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}
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else
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{
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return false;
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}
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}
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else
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{
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return true;
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}
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}
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FMOD_OPENSTATE LLAudioStreamManagerFMODEX::getOpenState(unsigned int* percentbuffered, bool* starving, bool* diskbusy)
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{
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FMOD_OPENSTATE state;
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mInternetStream->getOpenState(&state, percentbuffered, starving, diskbusy);
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return state;
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}
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void LLStreamingAudio_FMODEX::setBufferSizes(U32 streambuffertime, U32 decodebuffertime)
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{
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mSystem->setStreamBufferSize(streambuffertime/1000*128*128, FMOD_TIMEUNIT_RAWBYTES);
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FMOD_ADVANCEDSETTINGS settings;
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memset(&settings,0,sizeof(settings));
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settings.cbsize=sizeof(settings);
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settings.defaultDecodeBufferSize = decodebuffertime;//ms
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mSystem->setAdvancedSettings(&settings);
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}
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