audio system basic interface

src/audio/ALAudio.cpp

@@ -0,0 +1,197 @@
+#include "ALAudio.h"
+#include "alutil.h"
+#include <string>
+#include <iostream>
+
+using namespace audio;
+
+ALAudio::ALAudio(ALCdevice* device, ALCcontext* context)
+: device(device), context(context)
+{
+    ALCint size;
+    alcGetIntegerv(device, ALC_ATTRIBUTES_SIZE, 1, &size);
+    std::vector<ALCint> attrs(size);
+    alcGetIntegerv(device, ALC_ALL_ATTRIBUTES, size, &attrs[0]);
+    for (size_t i = 0; i < attrs.size(); ++i){
+       if (attrs[i] == ALC_MONO_SOURCES) {
+          std::cout << "AL: max mono sources: " << attrs[i+1] << std::endl;
+          maxSources = attrs[i+1];
+       }
+    }
+    auto devices = getAvailableDevices();
+    std::cout << "AL devices:" << std::endl;
+    for (auto& name : devices) {
+        std::cout << "  " << name << std::endl;
+    }
+}
+
+ALAudio::~ALAudio() {
+    for (ALSource* source : allsources) {
+        if (source->isPlaying()){
+            alSourceStop(source->id);
+            alCheckErrorsMacro();
+        }
+        alDeleteSources(1, &source->id); 
+        alCheckErrorsMacro();
+    }
+
+    for (ALBuffer* buffer : allbuffers){
+        alDeleteBuffers(1, &buffer->id); 
+        alCheckErrorsMacro();
+    }
+
+    alcMakeContextCurrent(context);
+    alcDestroyContext(context);
+    if (!alcCloseDevice(device)) {
+        std::cerr << "AL: device not closed!" << std::endl;
+    }
+    device = nullptr;
+    context = nullptr;
+}
+
+bool ALSource::setBuffer(ALBuffer* buffer) {
+    alSourcei(id, AL_BUFFER, buffer->id);
+    return alCheckErrorsMacro();
+}
+
+bool ALSource::play(){
+    alSourcePlay(id);
+    return alCheckErrorsMacro();
+}
+
+bool ALSource::isPlaying() {
+    int state;
+    alGetSourcei(id, AL_SOURCE_STATE, &state);
+    return state == AL_PLAYING;
+}
+
+bool ALSource::setPosition(glm::vec3 position) {
+    alSource3f(id, AL_POSITION, position.x, position.y, position.z);
+    return alCheckErrorsMacro();
+}
+
+bool ALSource::setVelocity(glm::vec3 velocity) {
+    alSource3f(id, AL_VELOCITY, velocity.x, velocity.y, velocity.z);
+    return alCheckErrorsMacro();
+}
+
+bool ALSource::setLoop(bool loop) {
+    alSourcei(id, AL_LOOPING, AL_TRUE ? loop : AL_FALSE);
+    return alCheckErrorsMacro();
+}
+
+bool ALSource::setGain(float gain) {
+    alSourcef(id, AL_GAIN, gain);
+    return alCheckErrorsMacro();
+}
+
+
+bool ALSource::setPitch(float pitch) {
+    alSourcef(id, AL_PITCH, pitch);
+    return alCheckErrorsMacro();
+}
+
+bool ALBuffer::load(int format, const char* data, int size, int freq) {
+    alBufferData(id, format, data, size, freq);
+    return alCheckErrorsMacro();
+}
+
+Sound* ALAudio::createSound(std::shared_ptr<PCM> pcm, bool keepPCM) {
+    // TODO: implement
+    return nullptr;
+}
+
+ALAudio* ALAudio::create() {
+    ALCdevice* device = alcOpenDevice(nullptr);
+    if (device == nullptr)
+        return nullptr;
+    ALCcontext* context = alcCreateContext(device, nullptr);
+    if (!alcMakeContextCurrent(context)){
+        alcCloseDevice(device);
+        return nullptr;
+    }
+    if (!alCheckErrorsMacro()) {
+        return nullptr;
+    }
+    std::cout << "AL: initialized" << std::endl;
+    return new ALAudio(device, context);
+}
+
+ALSource* ALAudio::getFreeSource(){
+    if (!freesources.empty()){
+        ALSource* source = freesources.back();
+        freesources.pop_back();
+        return source;
+    }
+    if (allsources.size() == maxSources){
+        std::cerr << "attempted to create new source, but limit is " << maxSources << std::endl;
+        return nullptr;
+    }
+    ALuint id;
+    alGenSources(1, &id);
+    if (!alCheckErrorsMacro())
+        return nullptr;
+
+    ALSource* source = new ALSource(id);
+    allsources.push_back(source);
+    return source;
+}
+
+ALBuffer* ALAudio::getFreeBuffer(){
+    if (!freebuffers.empty()){
+        ALBuffer* buffer = freebuffers.back();
+        freebuffers.pop_back();
+        return buffer;
+    }
+    if (allbuffers.size() == maxBuffers){
+        std::cerr << "attempted to create new ALbuffer, but limit is " << maxBuffers << std::endl;
+        return nullptr;
+    }
+    ALuint id;
+    alGenBuffers(1, &id);
+    if (!alCheckErrorsMacro()) {
+        return nullptr;
+    }
+
+    ALBuffer* buffer = new ALBuffer(id);
+    allbuffers.push_back(buffer);
+    return buffer;
+}
+
+void ALAudio::freeSource(ALSource* source){
+    freesources.push_back(source);
+}
+
+void ALAudio::freeBuffer(ALBuffer* buffer){
+    freebuffers.push_back(buffer);
+}
+
+std::vector<std::string> ALAudio::getAvailableDevices() const {
+    std::vector<std::string> devicesVec;
+
+    const ALCchar* devices;
+    devices = alcGetString(device, ALC_DEVICE_SPECIFIER);
+    if (!alCheckErrorsMacro()) {
+        return devicesVec;
+    }
+
+    const char* ptr = devices;
+    do {
+        devicesVec.push_back(std::string(ptr));
+        ptr += devicesVec.back().size() + 1;
+    }
+    while (ptr[0]);
+
+    return devicesVec;
+}
+
+void ALAudio::setListener(glm::vec3 position, glm::vec3 velocity, glm::vec3 at, glm::vec3 up){
+    ALfloat listenerOri[] = { at.x, at.y, at.z, up.x, up.y, up.z };
+
+    alListener3f(AL_POSITION, position.x, position.y, position.z);
+    alCheckErrorsMacro();
+    alListener3f(AL_VELOCITY, velocity.x, velocity.y, velocity.z);
+    alCheckErrorsMacro();
+    alListenerfv(AL_ORIENTATION, listenerOri);
+    alCheckErrorsMacro();
+}