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#if defined(WITH_AUDIO)
# define NCINE_INCLUDE_OPENAL
# include "../CommonHeaders.h"
#endif
#include "AudioStream.h"
#include "IAudioLoader.h"
#include "IAudioReader.h"
#include "../ServiceLocator.h"
#include <Containers/String.h>
namespace nCine
{
/*! Private constructor called only by `AudioStreamPlayer`. */
AudioStream::AudioStream()
: nextAvailableBufferIndex_(0), currentBufferId_(0), bytesPerSample_(0), numChannels_(0), isLooping_(false),
frequency_(0), numSamples_(0), duration_(0.0f), buffersIds_(NumBuffers)
{
#if defined(WITH_AUDIO)
alGetError();
alGenBuffers(NumBuffers, buffersIds_.data());
const ALenum error = alGetError();
if DEATH_UNLIKELY(error != AL_NO_ERROR) {
LOGW("alGenBuffers() failed with error 0x{:x}", error);
}
memBuffer_ = std::make_unique<char[]>(BufferSize);
#endif
}
/*! Private constructor called only by `AudioStreamPlayer`. */
AudioStream::AudioStream(StringView filename)
: AudioStream()
{
#if defined(WITH_AUDIO)
const bool hasLoaded = loadFromFile(filename);
if (!hasLoaded) {
LOGE("Audio file \"{}\" cannot be loaded", filename);
}
#endif
}
AudioStream::~AudioStream()
{
#if defined(WITH_AUDIO)
// Don't delete buffers if this is a moved out object
if (buffersIds_.size() == NumBuffers) {
alDeleteBuffers(NumBuffers, buffersIds_.data());
}
#endif
}
AudioStream::AudioStream(AudioStream&&) = default;
AudioStream& AudioStream::operator=(AudioStream&&) = default;
std::int32_t AudioStream::numStreamSamples() const
{
#if defined(WITH_AUDIO)
if (numChannels_ * bytesPerSample_ > 0) {
return BufferSize / (numChannels_ * bytesPerSample_);
}
#endif
return 0UL;
}
/*! \return A flag indicating whether the stream has been entirely decoded and played or not. */
bool AudioStream::enqueue(std::uint32_t source, bool looping)
{
#if defined(WITH_AUDIO)
if (audioReader_ == nullptr) {
return false;
}
// Set to false when the queue is empty and there is no more data to decode
bool shouldKeepPlaying = true;
ALint numProcessedBuffers;
alGetSourcei(source, AL_BUFFERS_PROCESSED, &numProcessedBuffers);
// Unqueueing
while (numProcessedBuffers > 0) {
ALuint unqueuedAlBuffer;
alSourceUnqueueBuffers(source, 1, &unqueuedAlBuffer);
nextAvailableBufferIndex_--;
buffersIds_[nextAvailableBufferIndex_] = unqueuedAlBuffer;
numProcessedBuffers--;
}
// Queueing
if (nextAvailableBufferIndex_ < NumBuffers) {
currentBufferId_ = buffersIds_[nextAvailableBufferIndex_];
std::int32_t bytes = audioReader_->read(memBuffer_.get(), BufferSize);
// EOF reached
if (bytes < BufferSize) {
if (looping) {
audioReader_->rewind();
std::int32_t moreBytes = audioReader_->read(memBuffer_.get() + bytes, BufferSize - bytes);
bytes += moreBytes;
}
}
// If it is still decoding data then enqueue
if (bytes > 0) {
// On iOS `alBufferDataStatic()` could be used instead
alBufferData(currentBufferId_, format_, memBuffer_.get(), bytes, frequency_);
alSourceQueueBuffers(source, 1, ¤tBufferId_);
nextAvailableBufferIndex_++;
}
// If there is no more data left to decode and the queue is empty
else if (nextAvailableBufferIndex_ == 0) {
shouldKeepPlaying = false;
stop(source);
}
}
ALenum state;
alGetSourcei(source, AL_SOURCE_STATE, &state);
// Handle buffer underrun case
if (state != AL_PLAYING) {
ALint numQueuedBuffers = 0;
alGetSourcei(source, AL_BUFFERS_QUEUED, &numQueuedBuffers);
if (numQueuedBuffers > 0) {
// Need to restart play
alSourcePlay(source);
}
}
return shouldKeepPlaying;
#else
return false;
#endif
}
void AudioStream::stop(std::uint32_t source)
{
#if defined(WITH_AUDIO)
// In order to unqueue all the buffers, the source must be stopped first
alSourceStop(source);
ALint numProcessedBuffers;
alGetSourcei(source, AL_BUFFERS_PROCESSED, &numProcessedBuffers);
// Unqueueing
while (numProcessedBuffers > 0) {
ALuint unqueuedAlBuffer;
alSourceUnqueueBuffers(source, 1, &unqueuedAlBuffer);
nextAvailableBufferIndex_--;
buffersIds_[nextAvailableBufferIndex_] = unqueuedAlBuffer;
numProcessedBuffers--;
}
audioReader_->rewind();
currentBufferId_ = 0;
#endif
}
void AudioStream::setLooping(bool value)
{
isLooping_ = value;
#if defined(WITH_AUDIO)
if (audioReader_ != nullptr) {
audioReader_->setLooping(value);
}
#endif
}
bool AudioStream::loadFromFile(StringView filename)
{
#if defined(WITH_AUDIO)
std::unique_ptr<IAudioLoader> audioLoader = IAudioLoader::createFromFile(filename);
if (audioLoader->hasLoaded()) {
createReader(*audioLoader);
return true;
}
#endif
return false;
}
void AudioStream::createReader(IAudioLoader& audioLoader)
{
#if defined(WITH_AUDIO)
bytesPerSample_ = audioLoader.bytesPerSample();
numChannels_ = audioLoader.numChannels();
if (numChannels_ == 1) {
format_ = (bytesPerSample_ == 2 ? AL_FORMAT_MONO16 : AL_FORMAT_MONO8);
} else if (numChannels_ == 2) {
format_ = (bytesPerSample_ == 2 ? AL_FORMAT_STEREO16 : AL_FORMAT_STEREO8);
} else {
bytesPerSample_ = 0;
numChannels_ = 0;
LOGE("Audio stream with {} channels is not supported", numChannels_);
return;
}
frequency_ = audioLoader.frequency();
numSamples_ = audioLoader.numSamples();
duration_ = (numSamples_ == UINT32_MAX ? -1.0f : float(numSamples_) / frequency_);
audioReader_ = audioLoader.createReader();
audioReader_->setLooping(isLooping_);
#endif
}
}
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