dispatch class not a singleton, engine is static

[chaz/yoink] / src / Moof / Sound.cc

/*******************************************************************************

 Copyright (c) 2009, Charles McGarvey
 All rights reserved.
 
 Redistribution   and   use  in  source  and  binary  forms,  with  or  without
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     this list of conditions and the following disclaimer.
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     this  list of conditions and the following disclaimer in the documentation
     and/or other materials provided with the distribution.
 
 THIS  SOFTWARE  IS  PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 DISCLAIMED.  IN  NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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*******************************************************************************/

#include <cstdio>
#include <deque>
#include <list>
#include <string>

#include <AL/al.h>
#include <vorbis/codec.h>
#include <vorbis/vorbisfile.h>

#include "Engine.hh"
#include "Library.hh"
#include "Log.hh"
#include "Sound.hh"
#include "Timer.hh"

#define BUFFER_SIZE (64 * 1024)
//#define BUFFER_SIZE (5*2048)

namespace Mf {


class Sound::Impl
{
public:

        static ALenum getAudioFormat(const vorbis_info* audioInfo)
        {
                if (audioInfo->channels == 1) return AL_FORMAT_MONO16;
                else                                              return AL_FORMAT_STEREO16;
        }
        

        class Buffer;
        typedef boost::shared_ptr<Buffer> BufferP;
        
        class Buffer : public Library<Buffer>
        {
        public:

                Buffer(const std::string& name) :
                        Library<Buffer>(name),
                        mBuffer(-1)
                {
                        mOggStream.datasource = 0;
                        openFile();
                }

                ~Buffer()
                {
                        if (mOggStream.datasource)
                        {
                                ov_clear(&mOggStream);
                        }
                        if (int(mBuffer) != -1) alDeleteBuffers(1, &mBuffer);
                }


                void openFile()
                {
                        if (mOggStream.datasource)
                        {
                                ov_clear(&mOggStream);
                                mOggStream.datasource = 0;
                        }

                        std::string filePath = Sound::getPath(getName());
                        int result = ov_fopen((char*)filePath.c_str(), &mOggStream);

                        if (result < 0)
                        {
                                logWarning << "error while loading sound "
                                                   << getName() << std::endl;
                                throw Error(Error::UNKNOWN_AUDIO_FORMAT, getName());
                        }

                        vorbis_info* vorbisInfo = ov_info(&mOggStream, -1);
                        mFormat = getAudioFormat(vorbisInfo);
                        mFreq = vorbisInfo->rate;
                }


                void loadAll(ALuint source)
                {
                        if (!mOggStream.datasource) openFile();
                        if (!mOggStream.datasource) return;

                        char data[BUFFER_SIZE];
                        int size = 0;

                        for (;;)
                        {
                                int section;
                                int result = ov_read(&mOggStream, data + size,
                                                BUFFER_SIZE - size, 0, 2, 1, &section);

                                if (result > 0)
                                {
                                        size += result;
                                }
                                else
                                {
                                        if (result < 0) logWarning("vorbis playback error");
                                        break;
                                }
                        }
                        if (size == 0)
                        {
                                logWarning << "decoded no bytes from "
                                                   << getName() << std::endl;
                                return;
                        }

                        alGenBuffers(1, &mBuffer);

                        alBufferData(mBuffer, mFormat, data, size, mFreq);
                        alSourcei(source, AL_BUFFER, mBuffer);

                        // don't need to keep this loaded
                        ov_clear(&mOggStream);
                        mOggStream.datasource = 0;
                }

                bool stream(ALuint buffer)
                {
                        char data[BUFFER_SIZE];
                        int size = 0;

                        while (size < BUFFER_SIZE)
                        {
                                int section;
                                int result = ov_read(&mOggStream, data + size,
                                                BUFFER_SIZE - size, 0, 2, 1, &section);

                                if (result > 0)
                                {
                                        size += result;
                                }
                                else
                                {
                                        if (result < 0) logWarning("vorbis playback error");
                                        break;
                                }
                        }

                        if (size == 0) return false;

                        alBufferData(buffer, mFormat, data, size, mFreq);

                        return true;
                }

                void rewind()
                {
                        if (!mOggStream.datasource) openFile();
                        else ov_raw_seek(&mOggStream, 0);
                }


        private:

                OggVorbis_File  mOggStream;
                ALenum                  mFormat;
                ALsizei                 mFreq;
                ALuint                  mBuffer;
        };


        Impl()
        {
                init();
        }

        Impl(const std::string& name)
        {
                init();
                enqueue(name);
        }

        void init()
        {
                mIsLoaded = false;
                mIsPlaying = false;
                mIsLooping = false;

                alGenSources(1, &mSource);

                ALfloat zero[] = {0.0f, 0.0f, 0.0f};
                alSourcef(mSource,  AL_PITCH, 1.0f);
                alSourcef(mSource,  AL_GAIN, 1.0f);
                alSourcefv(mSource, AL_POSITION, zero);
                alSourcefv(mSource, AL_VELOCITY, zero);

                alSourcei(mSource, AL_LOOPING, mIsLooping);
        }

        ~Impl()
        {
                stop();

                alDeleteSources(1, &mSource);

                while (!mBuffers.empty())
                {
                        alDeleteBuffers(1, &mBuffers.back());
                        mBuffers.pop_back();
                }
        }


        void play()
        {
                if (mQueue.empty()) return;

                if (!mIsLoaded) mQueue.front()->loadAll(mSource);

                alSourcePlay(mSource);
                mIsLoaded = true;
        }


        void playStream()
        {
                if (mQueue.empty()) return;

                if (!mIsPlaying)
                {
                        alSourcei(mSource, AL_LOOPING, false);
                        bufferStream();
                }

                if (!mStreamTimer.isValid())
                {
                        mStreamTimer.init(boost::bind(&Impl::streamUpdate, this, _1, _2),
                                        1.0, Timer::REPEAT);
                }

                alSourcePlay(mSource);
                mIsPlaying = true;
        }

        void bufferStream()
        {
                ALuint buffer;
                for (int i = mBuffers.size(); i <= 8; ++i)
                {
                        alGenBuffers(1, &buffer);

                        if (mQueue.front()->stream(buffer))
                        {
                                alSourceQueueBuffers(mSource, 1, &buffer);
                                mBuffers.push_back(buffer);
                        }
                        else
                        {
                                alDeleteBuffers(1, &buffer);
                                break;
                        }
                }
        }


        void update()
        {
                ALint finished = 0;

                alGetSourcei(mSource, AL_BUFFERS_PROCESSED, &finished);

                while (finished-- > 0)
                {
                        ALuint bufferObj;
                        alSourceUnqueueBuffers(mSource, 1, &bufferObj);

                        BufferP buffer = mQueue.front();
                        bool streamed = buffer->stream(bufferObj);

                        if (streamed)
                        {
                                alSourceQueueBuffers(mSource, 1, &bufferObj);
                        }
                        else
                        {
                                // the buffer couldn't be streamed, so get rid of it
                                mQueue.pop_front();

                                if (!mQueue.empty())
                                {
                                        // begin the next buffer in the queue
                                        mQueue.front()->rewind();
                                        mQueue.front()->stream(bufferObj);
                                        alSourceQueueBuffers(mSource, 1, &bufferObj);
                                        logInfo("loading new buffer");

                                        // queue up any unused buffers
                                        bufferStream();
                                }
                                else if (mIsLooping)
                                {
                                        // reload the same buffer
                                        mQueue.push_back(buffer);
                                        buffer->rewind();
                                        buffer->stream(bufferObj);
                                        alSourceQueueBuffers(mSource, 1, &bufferObj);
                                        logInfo("looping same buffer");
                                }
                                else
                                {
                                        // nothing more to play, stopping...
                                        mIsPlaying = false;
                                        std::remove(mBuffers.begin(), mBuffers.end(), bufferObj);
                                }
                        }
                }

                ALenum state;
                alGetSourcei(mSource, AL_SOURCE_STATE, &state);

                // restart playing if we're stopped but supposed to be playing... this
                // means we didn't queue enough and the audio skipped :-(
                if (mIsPlaying && state != AL_PLAYING)
                {
                        alSourcePlay(mSource);
                }
        }


        void stop()
        {
                alSourceStop(mSource);
                mIsPlaying = false;

                mStreamTimer.invalidate();
        }

        void pause()
        {
                alSourcePause(mSource);
                mIsPlaying = false;

                mStreamTimer.invalidate();
        }


        void setSample(const std::string& name)
        {
                stop();
                alSourcei(mSource, AL_BUFFER, AL_NONE);

                mQueue.clear();
                mIsLoaded = false;

                enqueue(name);

                while (!mBuffers.empty())
                {
                        alDeleteBuffers(1, &mBuffers.back());
                        mBuffers.pop_back();
                }
        }

        void enqueue(const std::string& name)
        {
                BufferP buffer = Buffer::getInstance(name);
                mQueue.push_back(buffer);
        }


        bool isPlaying() const
        {
                if (mIsPlaying) return true;

                ALenum state;
                alGetSourcei(mSource, AL_SOURCE_STATE, &state);

                return state == AL_PLAYING;
        }


        void setLooping(bool looping)
        {
                mIsLooping = looping;

                ALenum type;
                alGetSourcei(mSource, AL_SOURCE_TYPE, &type);

                if (type != AL_STREAMING)
                {
                        alSourcei(mSource, AL_LOOPING, mIsLooping);
                }
        }


        void streamUpdate(Timer& timer, Scalar t)
        {
                // don't let the music die!
                update();
                // TODO - might be nice to also allow using threads for streaming rather
                // than a timer, probably as a compile-time option
        }


        ALuint                                  mSource;
        std::list<ALuint>               mBuffers;

        bool                                    mIsLoaded;
        bool                                    mIsPlaying;
        bool                                    mIsLooping;

        std::deque<BufferP>             mQueue;

        Timer                                   mStreamTimer;
};


Sound::Sound() :
        // pass through
        mImpl(new Sound::Impl) {}

Sound::Sound(const std::string& name) :
        // pass through
        mImpl(new Sound::Impl(name)) {}


void Sound::setSample(const std::string& name)
{
        // pass through
        mImpl->setSample(name);
}


void Sound::play()
{
        // pass through
        mImpl->play();
}

void Sound::stop()
{
        // pass through
        mImpl->stop();
}

void Sound::pause()
{
        // pass through
        mImpl->pause();
}


void Sound::toggle()
{
        if (isPlaying()) pause();
        else play();
}

bool Sound::isPlaying() const
{
        // pass through
        return mImpl->isPlaying();
}


void Sound::setPosition(const Vector3& position)
{
        float vec[3] = {position[0], position[1], position[2]};
        alSourcefv(mImpl->mSource, AL_POSITION, vec);
}

void Sound::setVelocity(const Vector3& velocity)
{
        float vec[3] = {velocity[0], velocity[1], velocity[2]};
        alSourcefv(mImpl->mSource, AL_VELOCITY, vec);
}

void Sound::setGain(Scalar gain)
{
        alSourcef(mImpl->mSource, AL_GAIN, float(gain));
}

void Sound::setPitch(Scalar pitch)
{
        alSourcef(mImpl->mSource, AL_PITCH, float(pitch));
}

void Sound::setLooping(bool looping)
{
        // pass through
        mImpl->setLooping(looping);
}


void Sound::setListenerPosition(const Vector3& position)
{
        //alListener3f(AL_POSITION, float(position[0]), float(position[1]),
                        //float(position[2]));
        float vec[] = {position[0], position[1], position[2]};
        alListenerfv(AL_POSITION, vec);
}

void Sound::setListenerVelocity(const Vector3& velocity)
{
        //alListener3f(AL_VELOCITY, float(velocity[0]), float(velocity[1]),
                        //float(velocity[2]));
        float vec[] = {velocity[0], velocity[1], velocity[2]};
        alListenerfv(AL_VELOCITY, vec);
}

void Sound::setListenerOrientation(const Vector3& forward, const Vector3& up)
{
        float vec[6];
        vec[0] = float(forward[0]);
        vec[1] = float(forward[1]);
        vec[2] = float(forward[2]);
        vec[3] = float(up[0]);
        vec[4] = float(up[1]);
        vec[5] = float(up[2]);
        alListenerfv(AL_ORIENTATION, vec);
}


std::string Sound::getPath(const std::string& name)
{
        std::string path = Resource::getPath("sounds/" + name + ".ogg");
        return path;
}


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


void SoundStream::enqueue(const std::string& name)
{
        // pass through
        mImpl->enqueue(name);
}


void SoundStream::play()
{
        // pass through
        mImpl->playStream();
}


} // namespace Mf

/** vim: set ts=4 sw=4 tw=80: *************************************************/