From c301e3c82af4ad384f4baaa8244b3a5f26da5213 Mon Sep 17 00:00:00 2001
From: Perttu Ahola <celeron55@gmail.com>
Date: Fri, 23 Mar 2012 12:05:17 +0200
Subject: celeron55's sound system initial framework

---
 src/sound_openal.cpp | 322 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 322 insertions(+)
 create mode 100644 src/sound_openal.cpp

(limited to 'src/sound_openal.cpp')

diff --git a/src/sound_openal.cpp b/src/sound_openal.cpp
new file mode 100644
index 000000000..9566f95c2
--- /dev/null
+++ b/src/sound_openal.cpp
@@ -0,0 +1,322 @@
+/*
+Minetest-c55
+Copyright (C) 2012 celeron55, Perttu Ahola <celeron55@gmail.com>
+OpenAL support based on work by:
+Copyright (C) 2011 Sebastian 'Bahamada' Rühl
+Copyright (C) 2011 Cyriaque 'Cisoun' Skrapits <cysoun@gmail.com>
+Copyright (C) 2011 Giuseppe Bilotta <giuseppe.bilotta@gmail.com>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along
+with this program; ifnot, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "sound_openal.h"
+
+#if defined(_MSC_VER)
+	#include <al.h>
+	#include <alc.h>
+	#include <alext.h>
+#elif defined(__APPLE__)
+	#include <OpenAL/al.h>
+	#include <OpenAL/alc.h>
+	#include <OpenAL/alext.h>
+#else
+	#include <AL/al.h>
+	#include <AL/alc.h>
+	#include <AL/alext.h>
+#endif
+#include <vorbis/vorbisfile.h>
+#include "log.h"
+#include <map>
+#include <vector>
+#include "utility.h" // myrand()
+
+#define BUFFER_SIZE 30000
+
+static const char *alcErrorString(ALCenum err)
+{
+	switch (err) {
+	case ALC_NO_ERROR:
+		return "no error";
+	case ALC_INVALID_DEVICE:
+		return "invalid device";
+	case ALC_INVALID_CONTEXT:
+		return "invalid context";
+	case ALC_INVALID_ENUM:
+		return "invalid enum";
+	case ALC_INVALID_VALUE:
+		return "invalid value";
+	case ALC_OUT_OF_MEMORY:
+		return "out of memory";
+	default:
+		return "<unknown OpenAL error>";
+	}
+}
+
+static const char *alErrorString(ALenum err)
+{
+	switch (err) {
+	case AL_NO_ERROR:
+		return "no error";
+	case AL_INVALID_NAME:
+		return "invalid name";
+	case AL_INVALID_ENUM:
+		return "invalid enum";
+	case AL_INVALID_VALUE:
+		return "invalid value";
+	case AL_INVALID_OPERATION:
+		return "invalid operation";
+	case AL_OUT_OF_MEMORY:
+		return "out of memory";
+	default:
+		return "<unknown OpenAL error>";
+	}
+}
+
+void f3_set(ALfloat *f3, v3f v)
+{
+	f3[0] = v.X;
+	f3[1] = v.Y;
+	f3[2] = v.Z;
+}
+
+struct SoundBuffer
+{
+	ALenum	format;
+	ALsizei	freq;
+	ALuint	bufferID;
+	std::vector<char> buffer;
+};
+
+SoundBuffer* loadOggFile(const std::string &filepath)
+{
+	int endian = 0; // 0 for Little-Endian, 1 for Big-Endian
+	int bitStream;
+	long bytes;
+	char array[BUFFER_SIZE]; // Local fixed size array
+	vorbis_info *pInfo;
+	OggVorbis_File oggFile;
+
+	// Try opening the given file
+	if(ov_fopen(filepath.c_str(), &oggFile) != 0)
+	{
+		infostream<<"Audio: Error opening "<<filepath<<" for decoding"<<std::endl;
+		return NULL;
+	}
+
+	SoundBuffer *snd = new SoundBuffer;
+
+	// Get some information about the OGG file
+	pInfo = ov_info(&oggFile, -1);
+
+	// Check the number of channels... always use 16-bit samples
+	if(pInfo->channels == 1)
+		snd->format = AL_FORMAT_MONO16;
+	else
+		snd->format = AL_FORMAT_STEREO16;
+
+	// The frequency of the sampling rate
+	snd->freq = pInfo->rate;
+
+	// Keep reading until all is read
+	do
+	{
+		// Read up to a buffer's worth of decoded sound data
+		bytes = ov_read(&oggFile, array, BUFFER_SIZE, endian, 2, 1, &bitStream);
+
+		if(bytes < 0)
+		{
+			ov_clear(&oggFile);
+			infostream<<"Audio: Error decoding "<<filepath<<std::endl;
+			return NULL;
+		}
+
+		// Append to end of buffer
+		snd->buffer.insert(snd->buffer.end(), array, array + bytes);
+	} while (bytes > 0);
+
+	alGenBuffers(1, &snd->bufferID);
+	alBufferData(snd->bufferID, snd->format,
+			&(snd->buffer[0]), snd->buffer.size(),
+			snd->freq);
+
+	ALenum error = alGetError();
+
+	if(error != AL_NO_ERROR){
+		infostream<<"Audio: OpenAL error: "<<alErrorString(error)
+				<<"preparing sound buffer"<<std::endl;
+	}
+
+	infostream<<"Audio file "<<filepath<<" loaded"<<std::endl;
+
+	// Clean up!
+	ov_clear(&oggFile);
+
+	return snd;
+}
+
+struct PlayingSound
+{
+};
+
+class OpenALSoundManager: public ISoundManager
+{
+private:
+	ALCdevice *m_device;
+	ALCcontext *m_context;
+	bool m_can_vorbis;
+	int m_next_id;
+	std::map<std::string, std::vector<SoundBuffer*> > m_buffers;
+	std::map<int, PlayingSound*> m_sounds_playing;
+public:
+	OpenALSoundManager():
+		m_device(NULL),
+		m_context(NULL),
+		m_can_vorbis(false),
+		m_next_id(1)
+	{
+		ALCenum error = ALC_NO_ERROR;
+		
+		infostream<<"Audio: Initializing..."<<std::endl;
+
+		m_device = alcOpenDevice(NULL);
+		if(!m_device){
+			infostream<<"Audio: No audio device available, audio system "
+				<<"not initialized"<<std::endl;
+			return;
+		}
+
+		if(alcIsExtensionPresent(m_device, "EXT_vorbis")){
+			infostream<<"Audio: Vorbis extension present"<<std::endl;
+			m_can_vorbis = true;
+		} else{
+			infostream<<"Audio: Vorbis extension NOT present"<<std::endl;
+			m_can_vorbis = false;
+		}
+
+		m_context = alcCreateContext(m_device, NULL);
+		if(!m_context){
+			error = alcGetError(m_device);
+			infostream<<"Audio: Unable to initialize audio context, "
+					<<"aborting audio initialization ("<<alcErrorString(error)
+					<<")"<<std::endl;
+			alcCloseDevice(m_device);
+			m_device = NULL;
+			return;
+		}
+
+		if(!alcMakeContextCurrent(m_context) ||
+				(error = alcGetError(m_device) != ALC_NO_ERROR))
+		{
+			infostream<<"Audio: Error setting audio context, aborting audio "
+					<<"initialization ("<<alcErrorString(error)<<")"<<std::endl;
+			alcDestroyContext(m_context);
+			m_context = NULL;
+			alcCloseDevice(m_device);
+			m_device = NULL;
+			return;
+		}
+
+		alDistanceModel(AL_EXPONENT_DISTANCE);
+
+		infostream<<"Audio: Initialized: OpenAL "<<alGetString(AL_VERSION)
+				<<", using "<<alcGetString(m_device, ALC_DEVICE_SPECIFIER)
+				<<std::endl;
+	}
+
+	~OpenALSoundManager()
+	{
+		infostream<<"Audio: Deinitializing..."<<std::endl;
+		// KABOOM!
+		// TODO: Clear SoundBuffers
+		alcMakeContextCurrent(NULL);
+		alcDestroyContext(m_context);
+		m_context = NULL;
+		alcCloseDevice(m_device);
+		m_device = NULL;
+		infostream<<"Audio: Deinitialized."<<std::endl;
+	}
+	
+	void addBuffer(const std::string &name, SoundBuffer *buf)
+	{
+		std::map<std::string, std::vector<SoundBuffer*> >::iterator i =
+				m_buffers.find(name);
+		if(i != m_buffers.end()){
+			i->second.push_back(buf);
+			return;
+		}
+		std::vector<SoundBuffer*> bufs;
+		bufs.push_back(buf);
+		return;
+	}
+
+	SoundBuffer* getBuffer(const std::string &name)
+	{
+		std::map<std::string, std::vector<SoundBuffer*> >::iterator i =
+				m_buffers.find(name);
+		if(i == m_buffers.end())
+			return NULL;
+		std::vector<SoundBuffer*> &bufs = i->second;
+		int j = myrand() % bufs.size();
+		return bufs[j];
+	}
+
+	void updateListener(v3f pos, v3f vel, v3f at, v3f up)
+	{
+		ALfloat f[6];
+		f3_set(f, pos);
+		alListenerfv(AL_POSITION, f);
+		f3_set(f, vel);
+		alListenerfv(AL_VELOCITY, f);
+		f3_set(f, at);
+		f3_set(f+3, up);
+		alListenerfv(AL_ORIENTATION, f);
+	}
+	
+	bool loadSound(const std::string &name,
+			const std::string &filepath)
+	{
+		SoundBuffer *buf = loadOggFile(filepath);
+		if(buf)
+			addBuffer(name, buf);
+		return false;
+	}
+	bool loadSound(const std::string &name,
+			const std::vector<char> &filedata)
+	{
+		errorstream<<"OpenALSoundManager: Loading from filedata not"
+				" implemented"<<std::endl;
+		return false;
+	}
+
+	int playSound(const std::string &name, int loopcount,
+			float volume)
+	{
+		return -1;
+	}
+	int playSoundAt(const std::string &name, int loopcount,
+			v3f pos, float volume)
+	{
+		return -1;
+	}
+	void stopSound(int sound)
+	{
+	}
+};
+
+ISoundManager *createSoundManager()
+{
+	return new OpenALSoundManager();
+};
+
-- 
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