SoundSource::SoundSource()
{
priv::ensureALInit();
alCheck(alGenSources(1, &m_source));
alCheck(alSourcei(m_source, AL_BUFFER, 0));
}
mad_flow MADStream::ms_output(void* user, mad_header const* header,
mad_pcm* pcm) {
RW_UNUSED(header);
MADStream* self = static_cast<MADStream*>(user);
if (self->stopped) {
return MAD_FLOW_STOP;
}
if (!self->numFreeBuffers) {
ALint buffersProcessed;
do {
/**
* Sleep a bit while waiting for OpenAL buffers to become available.
* The number is arbitrary and depends on the size of the
* buffer/audio samples,
* as well as how quickly the computer can feed more buffers into
* OpenAL.
*/
std::this_thread::sleep_for(std::chrono::milliseconds(20));
alGetSourcei(self->alSource, AL_BUFFERS_PROCESSED,
&buffersProcessed);
} while (buffersProcessed <= 0);
alCheck(alSourceUnqueueBuffers(self->alSource, buffersProcessed,
self->unqueuedBuffers));
self->numFreeBuffers += buffersProcessed;
}
int nsamples = pcm->length;
mad_fixed_t const *left, *right;
left = pcm->samples[0];
right = pcm->samples[1];
int s = 0;
while (nsamples--) {
signed int sample = *left++;
self->mCurrentSamples.push_back(scale(sample));
sample = *right++;
self->mCurrentSamples.push_back(scale(sample));
s++;
}
alCheck(alBufferData(self->buffers[self->currentBuffer], AL_FORMAT_STEREO16,
self->mCurrentSamples.data(),
self->mCurrentSamples.size() * sizeof(uint16_t),
pcm->samplerate));
alCheck(alSourceQueueBuffers(self->alSource, 1,
self->buffers + self->currentBuffer));
self->mCurrentSamples.clear();
self->currentBuffer++;
self->currentBuffer %= numALbuffers;
self->numFreeBuffers--;
return MAD_FLOW_CONTINUE;
}
bool SoundStream::fillAndPushBuffer(unsigned int bufferNum, bool immediateLoop)
{
bool requestStop = false;
// Acquire audio data, also address EOF and error cases if they occur
Chunk data = {NULL, 0};
for (Uint32 retryCount = 0; !onGetData(data) && (retryCount < BufferRetries); ++retryCount)
{
// Mark the buffer as the last one (so that we know when to reset the playing position)
m_endBuffers[bufferNum] = true;
// Check if the stream must loop or stop
if (!m_loop)
{
// Not looping: request stop
requestStop = true;
break;
}
// Return to the beginning of the stream source
onSeek(Time::Zero);
// If we got data, break and process it, else try to fill the buffer once again
if (data.samples && data.sampleCount)
break;
// If immediateLoop is specified, we have to immediately adjust the sample count
if (immediateLoop)
{
// We just tried to begin preloading at EOF: reset the sample count
m_samplesProcessed = 0;
m_endBuffers[bufferNum] = false;
}
// We're a looping sound that got no data, so we retry onGetData()
}
// Fill the buffer if some data was returned
if (data.samples && data.sampleCount)
{
unsigned int buffer = m_buffers[bufferNum];
// Fill the buffer
ALsizei size = static_cast<ALsizei>(data.sampleCount) * sizeof(Int16);
alCheck(alBufferData(buffer, m_format, data.samples, size, m_sampleRate));
// Push it into the sound queue
alCheck(alSourceQueueBuffers(m_source, 1, &buffer));
}
else
{
// If we get here, we most likely ran out of retries
requestStop = true;
}
return requestStop;
}
void SoundStream::clearQueue()
{
// Get the number of buffers still in the queue
ALint nbQueued;
alCheck(alGetSourcei(m_source, AL_BUFFERS_QUEUED, &nbQueued));
// Unqueue them all
ALuint buffer;
for (ALint i = 0; i < nbQueued; ++i)
alCheck(alSourceUnqueueBuffers(m_source, 1, &buffer));
}
SoundSource::SoundSource(const SoundSource& copy)
{
alCheck(alGenSources(1, &m_source));
alCheck(alSourcei(m_source, AL_BUFFER, 0));
setPitch(copy.getPitch());
setVolume(copy.getVolume());
setPosition(copy.getPosition());
setRelativeToListener(copy.isRelativeToListener());
setMinDistance(copy.getMinDistance());
setAttenuation(copy.getAttenuation());
}
bool SoundManager::SoundBuffer::bufferData(SoundSource& soundSource)
{
alCheck(alBufferData(
buffer,
soundSource.fileInfo.channels == 1 ? AL_FORMAT_MONO16 : AL_FORMAT_STEREO16,
&soundSource.data.front(),
soundSource.data.size() * sizeof(uint16_t),
soundSource.fileInfo.samplerate
));
alCheck(alSourcei(source, AL_BUFFER, buffer));
return true;
}
Time Sound::getPlayingOffset() const
{
ALfloat secs = 0.f;
alCheck(alGetSourcef(m_source, AL_SEC_OFFSET, &secs));
return seconds(secs);
}
bool Sound::getLoop() const
{
ALint loop;
alCheck(alGetSourcei(m_source, AL_LOOPING, &loop));
return loop != 0;
}
void Listener::setDirection(float x, float y, float z)
{
priv::ensureALInit();
float orientation[] = {x, y, z, 0.f, 1.f, 0.f};
alCheck(alListenerfv(AL_ORIENTATION, orientation));
}
bool SoundBuffer::update(unsigned int channelCount, unsigned int sampleRate)
{
// Check parameters
if (!channelCount || !sampleRate || m_samples.empty())
return false;
// Find the good format according to the number of channels
ALenum format = priv::AudioDevice::getFormatFromChannelCount(channelCount);
// Check if the format is valid
if (format == 0)
{
err() << "Failed to load sound buffer (unsupported number of channels: " << channelCount << ")" << std::endl;
return false;
}
// Fill the buffer
ALsizei size = static_cast<ALsizei>(m_samples.size()) * sizeof(Int16);
alCheck(alBufferData(m_buffer, format, &m_samples[0], size, sampleRate));
// Compute the duration
m_duration = seconds(static_cast<float>(m_samples.size()) / sampleRate / channelCount);
return true;
}
Vector3f Listener::getDirection()
{
float orientation[6];
alCheck(alGetListenerfv(AL_ORIENTATION, orientation));
return Vector3f(orientation[0], orientation[1], orientation[2]);
}
Vector3f Listener::getPosition()
{
Vector3f position;
alCheck(alGetListener3f(AL_POSITION, &position.x, &position.y, &position.z));
return position;
}
float Listener::getGlobalVolume()
{
float volume = 0.f;
alCheck(alGetListenerf(AL_GAIN, &volume));
return volume * 100;
}
Channel::Channel()
{
alGenSources(1, &m_source);
if (alCheck())
{
GetLogger()->Debug("Failed to create sound source. Code: %d\n", alGetCode());
m_ready = false;
}
else
{
m_ready = true;
}
m_priority = 0;
m_buffer = nullptr;
m_loop = false;
m_mute = false;
m_initFrequency = 0.0f;
m_startAmplitude = 0.0f;
m_startFrequency = 0.0f;
m_changeFrequency = 0.0f;
m_volume = 0.0f;
m_id = 0;
}
SoundBuffer::SoundBuffer() :
m_buffer (0),
m_duration()
{
// Create the buffer
alCheck(alGenBuffers(1, &m_buffer));
}
unsigned int SoundBuffer::getChannelCount() const
{
ALint channelCount;
alCheck(alGetBufferi(m_buffer, AL_CHANNELS, &channelCount));
return channelCount;
}
float SoundSource::getPitch() const
{
ALfloat pitch;
alCheck(alGetSourcef(m_source, AL_PITCH, &pitch));
return pitch;
}
void AudioDevice::setPosition(const Vector3f& position)
{
if (audioContext)
alCheck(alListener3f(AL_POSITION, position.x, position.y, position.z));
listenerPosition = position;
}
unsigned int SoundBuffer::getSampleRate() const
{
ALint sampleRate;
alCheck(alGetBufferi(m_buffer, AL_FREQUENCY, &sampleRate));
return sampleRate;
}
float SoundSource::getAttenuation() const
{
ALfloat attenuation;
alCheck(alGetSourcef(m_source, AL_ROLLOFF_FACTOR, &attenuation));
return attenuation;
}
void AudioDevice::setGlobalVolume(float volume)
{
if (audioContext)
alCheck(alListenerf(AL_GAIN, volume * 0.01f));
listenerVolume = volume;
}
float SoundSource::getMinDistance() const
{
ALfloat distance;
alCheck(alGetSourcef(m_source, AL_REFERENCE_DISTANCE, &distance));
return distance;
}
bool SoundSource::isRelativeToListener() const
{
ALint relative;
alCheck(alGetSourcei(m_source, AL_SOURCE_RELATIVE, &relative));
return relative != 0;
}
Vector3f SoundSource::getPosition() const
{
Vector3f position;
alCheck(alGetSource3f(m_source, AL_POSITION, &position.x, &position.y, &position.z));
return position;
}
float SoundSource::getVolume() const
{
ALfloat gain;
alCheck(alGetSourcef(m_source, AL_GAIN, &gain));
return gain * 100.f;
}
Source::~Source()
{
stop();
if (id)
{
alCheck(alDeleteSources(1, &id));
}
}
bool SoundStream::fillAndPushBuffer(unsigned int bufferNum)
{
bool requestStop = false;
// Acquire audio data
Chunk data = {NULL, 0};
if (!onGetData(data))
{
// Mark the buffer as the last one (so that we know when to reset the playing position)
m_endBuffers[bufferNum] = true;
// Check if the stream must loop or stop
if (m_loop)
{
// Return to the beginning of the stream source
onSeek(Time::Zero);
// If we previously had no data, try to fill the buffer once again
if (!data.samples || (data.sampleCount == 0))
{
return fillAndPushBuffer(bufferNum);
}
}
else
{
// Not looping: request stop
requestStop = true;
}
}
// Fill the buffer if some data was returned
if (data.samples && data.sampleCount)
{
unsigned int buffer = m_buffers[bufferNum];
// Fill the buffer
ALsizei size = static_cast<ALsizei>(data.sampleCount) * sizeof(Int16);
alCheck(alBufferData(buffer, m_format, data.samples, size, m_sampleRate));
// Push it into the sound queue
alCheck(alSourceQueueBuffers(m_source, 1, &buffer));
}
return requestStop;
}
SoundBuffer::SoundBuffer() :
m_buffer (0),
m_duration()
{
priv::ensureALInit();
// Create the buffer
alCheck(alGenBuffers(1, &m_buffer));
}
float Listener::getGlobalVolume()
{
priv::ensureALInit();
float volume = 0.f;
alCheck(alGetListenerf(AL_GAIN, &volume));
return volume * 100;
}
Vector3f Listener::getPosition()
{
priv::ensureALInit();
Vector3f position;
alCheck(alGetListener3f(AL_POSITION, &position.x, &position.y, &position.z));
return position;
}
