OpenAL support

1 files changed, 112 insertions, 0 deletions

diff --git a/src/audio/buffers.cc b/src/audio/buffers.cc
new file mode 100644
index 0000000..9223380
--- /dev/null
+++ b/src/audio/buffers.cc
@@ -0,0 +1,112 @@
+/*
+   audio/buffers.h
+   This file is part of the Osirion project and is distributed under
+   the terms of the GNU General Public License version 2
+*/
+
+#include "audio/buffers.h"
+#include "audio/pcm.h"
+#include "audio/wav.h"
+#include "sys/sys.h"
+
+namespace audio {
+
+std::map<std::string, size_t> Buffers::registry;
+size_t Buffers::index;
+ALuint Buffers::buffers[MAXBUFFERS];
+
+void Buffers::init()
+{
+	int error;
+	clear();
+
+	alGenBuffers(MAXBUFFERS, buffers);
+
+	if ((error = alGetError()) != AL_NO_ERROR) {
+		con_warn << "Error " << error << " initializing OpenAL bufers!" << std::endl;
+		return;
+	}
+}
+
+void Buffers::shutdown()
+{
+	alDeleteBuffers(MAXBUFFERS, buffers);
+
+	clear();
+}
+
+void Buffers::clear()
+{
+	registry.clear();
+	memset(buffers,0, sizeof(buffers));
+	index = 0;
+}
+
+size_t Buffers::load(std::string name)
+{
+	// check if it is already loaded
+	iterator it = registry.find(name);
+	if (it != registry.end())
+		return (*it).second;
+
+	// load wav file
+	PCM *pcm = Wav::load(name);
+	if (!pcm) {
+		registry[name] = 0;
+		return 0;
+	}	
+
+	if (index == MAXBUFFERS) {
+		con_error << "Buffer limit " << MAXBUFFERS << " exceeded!" << std::endl;
+		delete pcm;
+		registry[name] = 0;
+		return 0;
+	}
+	
+	ALenum format = 0;
+	if (pcm->bitspersample() == 16) {
+		if (pcm->channels() == 1) {
+			format = AL_FORMAT_MONO16;
+		} else if (pcm->channels() == 2) {
+			format = AL_FORMAT_STEREO16;
+		};
+	} else if (pcm->bitspersample() == 8) {
+		if (pcm->channels() == 1) {
+			format = AL_FORMAT_MONO8;
+		} else if (pcm->channels() == 2) {
+			format = AL_FORMAT_STEREO8;
+		};
+	}
+	
+	size_t id = index;
+	alBufferData(buffers[id], format, pcm->data(), pcm->size(), pcm->samplerate());
+	if (alGetError())
+		con_warn << "Error loading PCM data " << name << std::endl;
+
+	registry[name] = id;
+	index++;
+
+	return id;
+}
+
+size_t Buffers::find(std::string name)
+{
+	size_t id = 0;
+	iterator it = registry.find(name);
+	if (it != registry.end())
+		id = (*it).second;
+	return id;
+}
+
+void Buffers::bind(ALuint source, std::string name)
+{
+	int error;
+	size_t id = find(name);
+	alSourcei(source, AL_BUFFER, buffers[id]);
+	if ((error = alGetError()) != AL_NO_ERROR) {
+		con_warn << "Error " << std::hex << error << " binding " << name 
+			<< " source " << source << " buffer " << buffers[id] << std::endl;
+	}
+}
+
+}