OpenAL support

9 files changed, 520 insertions, 0 deletions

diff --git a/src/audio/Makefile.am b/src/audio/Makefile.am
new file mode 100644
index 0000000..d1524cf
--- /dev/null
+++ b/src/audio/Makefile.am
@@ -0,0 +1,6 @@
+INCLUDES = -I$(top_srcdir)/src
+METASOURCES = AUTO
+noinst_LTLIBRARIES = libaudio.la
+libaudio_la_LDFLAGS = -avoid-version -no-undefined
+noinst_HEADERS = audio.h buffers.h pcm.h wav.h
+libaudio_la_SOURCES = audio.cc buffers.cc pcm.cc wav.cc
diff --git a/src/audio/audio.cc b/src/audio/audio.cc
new file mode 100644
index 0000000..063a079
--- /dev/null
+++ b/src/audio/audio.cc
@@ -0,0 +1,80 @@
+/*
+   audio/audio.cc
+   This file is part of the Osirion project and is distributed under
+   the terms of the GNU General Public License version 2
+*/
+
+#include "AL/al.h"
+#include "AL/alc.h"
+
+#include "audio/audio.h"
+#include "audio/buffers.h"
+#include "audio/pcm.h"
+#include "sys/sys.h"
+
+namespace audio
+{
+
+ALCdevice 			*audio_device = 0;
+ALCcontext			*audio_context = 0;
+
+ALuint 				source = 0;
+
+void init()
+{
+	con_print << "^BInitializing audio...";
+
+	// open the default audio device
+	audio_device = alcOpenDevice(0);
+
+	if (!audio_device) {
+		con_warn << "Could not initialize audio!";
+		return;
+	}
+
+	// create the audio context
+	audio_context = alcCreateContext(audio_device ,0);
+	alcMakeContextCurrent(audio_context);
+
+	// clear errors
+	alGetError();
+	
+	Buffers::init();
+	
+	//con_debug << "  device  ^B" << alcGetString(audio_device, ALC_DEFAULT_DEVICE_SPECIFIER) << std::endl;
+	load("ui/chat");
+	
+	// default sound source
+	alGenSources(1, &source);
+}
+
+void load (const char *name)
+{
+	Buffers::load(std::string(name));
+}
+
+void shutdown()
+{
+	con_print << "^BShutting down audio...";
+
+	if (audio_context) {
+		alcMakeContextCurrent(0);
+		alcDestroyContext(audio_context);
+		audio_context = 0;
+	}
+
+	if (audio_device) {
+		alcCloseDevice(audio_device);
+		audio_device = 0;
+	}	
+
+	alDeleteSources(1, &source);
+}
+
+void play(const char *name)
+{
+	Buffers::bind(source, std::string(name));
+	alSourcePlay(source);
+}
+
+}
diff --git a/src/audio/audio.h b/src/audio/audio.h
new file mode 100644
index 0000000..92b8786
--- /dev/null
+++ b/src/audio/audio.h
@@ -0,0 +1,28 @@
+/*
+   audio/audio.h
+   This file is part of the Osirion project and is distributed under
+   the terms of the GNU General Public License version 2
+*/
+
+#ifndef __INCLUDED_AUDIO_AUDIO_H__
+#define __INCLUDED_AUDIO_AUDIO_H__
+
+/// functions to handle audio
+namespace audio
+{
+
+/// initialize the audio subsystem
+void init();
+
+/// shut down the audio subsystem
+void shutdown();
+
+/// load an audio sample
+void load(const char *name);
+
+/// play a previously loaded audio sample
+void play(const char *name);
+
+}
+
+#endif // __INCLUDED_AUDIO_AUDIO_H__
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;
+	}
+}
+
+}
diff --git a/src/audio/buffers.h b/src/audio/buffers.h
new file mode 100644
index 0000000..e61ba7b
--- /dev/null
+++ b/src/audio/buffers.h
@@ -0,0 +1,47 @@
+/*
+   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
+*/
+
+#ifndef __INCLUDED_AUDIO_BUFFERS_H__
+#define __INCLUDED_AUDIO_BUFFERS_H__
+
+#include "AL/al.h"
+#include "AL/alc.h"
+
+#include <string>
+#include <map>
+
+namespace audio {
+
+const size_t MAXBUFFERS		= 128;
+
+/// OpenAL buffers wrapper class
+
+class Buffers {
+public:
+	static void init();
+	static void shutdown();
+	static void clear();
+
+	/// find previously loaded PCM data
+	static size_t find(std::string name);
+
+	/// load audio data into a buffer ans return the buffer index
+	static size_t load(std::string name);
+
+	/// bind a buffer to a source
+	static void bind(ALuint source, std::string name);
+
+private:
+	typedef std::map<std::string, size_t>::iterator iterator;
+
+	static std::map<std::string, size_t> registry;
+	static size_t index;
+	static ALuint buffers[MAXBUFFERS];
+};
+
+}
+
+#endif // __INCLUDED_AUDIO_BUFFERS_H__
diff --git a/src/audio/pcm.cc b/src/audio/pcm.cc
new file mode 100644
index 0000000..b485199
--- /dev/null
+++ b/src/audio/pcm.cc
@@ -0,0 +1,49 @@
+/*
+   audio/pcm.cc
+   This file is part of the Osirion project and is distributed under
+   the terms of the GNU General Public License version 2
+*/
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "audio/pcm.h"
+#include "audio/wav.h"
+
+namespace audio {
+
+PCM::PCM(unsigned int samplerate, unsigned int bitspersample, unsigned int channels, size_t size)
+{
+	pcm_bitspersample = bitspersample;
+	pcm_samplerate = samplerate;
+	pcm_size = size;
+	pcm_channels = channels;
+
+	pcm_data = (unsigned char *) malloc(pcm_size);
+	clear();
+}
+
+PCM::~PCM()
+{
+	free(pcm_data);
+}
+
+void PCM::clear()
+{
+	memset(pcm_data, 0, pcm_size);
+}
+
+void PCM::load(const char *name)
+{
+	PCM *pcm = Wav::load(name);
+	if (pcm) {
+		delete pcm;
+	}
+}
+
+void PCM::load(std::string const & name)
+{
+	load(name.c_str());
+}
+
+}
diff --git a/src/audio/pcm.h b/src/audio/pcm.h
new file mode 100644
index 0000000..740a23c
--- /dev/null
+++ b/src/audio/pcm.h
@@ -0,0 +1,57 @@
+/*
+   audio/pcm.h
+   This file is part of the Osirion project and is distributed under
+   the terms of the GNU General Public License version 2
+*/
+
+#ifndef __INCLUDED_AUDIO_PCM_H__
+#define __INCLUDED_AUDIO_PCM_H__
+
+#include <string>
+
+namespace audio {
+
+/// class to hold PCM audio data
+class PCM {
+
+public:
+	PCM(unsigned int samplerate, unsigned int samplesize, unsigned int channels, size_t size);
+	~PCM();
+
+	void clear();
+
+	/// pointer to the raw pcm data
+	inline unsigned char *data() { return pcm_data; }
+
+	/// index into the raw pcm data
+	inline unsigned char *operator[](size_t index) { return &pcm_data[index]; }
+
+	/// size in bytes
+	inline size_t size() { return pcm_size; }
+
+	/// samplerate in samples per second
+	inline unsigned int samplerate() const { return pcm_samplerate; }
+
+	/// number of bits per sample
+	inline unsigned int bitspersample() const { return pcm_bitspersample; }
+
+	/// number of channels
+	inline unsigned int channels() const { return pcm_channels; }
+
+	/// load PCM audio data from file
+	static void load(std::string const & name);
+
+	static void load(const char *name);
+
+private:
+	unsigned char		*pcm_data;
+
+	unsigned int 		pcm_channels;
+	unsigned int		pcm_samplerate;
+	unsigned int		pcm_bitspersample;
+	size_t			pcm_size;
+};
+
+}
+
+#endif // __INCLUDED_AUDIO_PCM_H__
diff --git a/src/audio/wav.cc b/src/audio/wav.cc
new file mode 100644
index 0000000..5d118c6
--- /dev/null
+++ b/src/audio/wav.cc
@@ -0,0 +1,119 @@
+/*
+   audio/wav.h
+   This file is part of the Osirion project and is distributed under
+   the terms of the GNU General Public License version 2
+*/
+
+/*
+see 
+
+http://ccrma.stanford.edu/CCRMA/Courses/422/projects/WaveFormat/
+*/
+
+#include "string.h"
+
+#include <iostream>
+#include <string>
+
+#include "audio/wav.h"
+#include "filesystem/filesystem.h"
+#include "sys/sys.h"
+
+namespace audio {
+
+PCM *Wav::load(std::string const & name)
+{
+	if (!name.size())
+		return 0;
+
+	std::string filename("sounds/");
+	filename.append(name);
+	filename.append(".wav");
+	
+	filesystem::File *wav_file = filesystem::open(filename.c_str());
+	if (!wav_file) {
+		con_warn << "Could not open " << filename << std::endl;
+		return 0;
+	}
+
+	unsigned char header[44];
+	memset(header, 0, sizeof(header));
+	if (!wav_file->read(header, 44)) {
+		con_warn << "Error reading " << filename << std::endl;
+		filesystem::close(wav_file);
+		return 0;
+	}
+
+	// header RIFF
+	if (strncmp((char *)header, "RIFF", 4)) {
+		con_warn << "Error reading " << filename << ": invalid RIFF header!" << std::endl;
+		filesystem::close(wav_file);
+		return 0;
+	}
+
+	// format WAVE
+	if (strncmp((char *)header+8, "WAVE", 4) != 0) {
+		con_warn << "Error reading " << filename << ": invalid WAVE header!" << std::endl;
+		filesystem::close(wav_file);
+		return 0;
+	}
+
+	// file size
+	//size_t chunksize = header[4] + (header[5] << 8) + (header[6] << 16) + (header[7] << 24);
+
+	if (strncmp((char *)header+12, "fmt ", 4) != 0) {
+		con_warn << "Error reading " << filename << ": invalid format header!" << std::endl;
+		filesystem::close(wav_file);
+		return 0;
+	}
+
+	size_t subchunksize1 = header[16] + (header[17] << 8) + (header[18] << 16) + (header[19] << 24);
+	size_t audioformat = header[20] + (header[21] << 8);
+
+	if ((subchunksize1 != 16) || (audioformat != 1)) {
+		con_warn << "Error reading " << filename << ": unrecognized file format!" << std::endl;
+		filesystem::close(wav_file);
+		return 0;
+
+	}
+
+	unsigned int channels = header[22] + (header[23] << 8);
+	if ((channels < 1) || (channels >2)) {
+		con_warn << "Error reading " << filename << ": invalid number of channels!" << std::endl;
+		filesystem::close(wav_file);
+		return 0;
+	}
+
+	unsigned int samplerate = header[24] + ((size_t)header[25] << 8) + ((size_t)header[26] << 16) + ((size_t)header[27] << 24);
+	//size_t byterate  = header[28] + (header[29] << 8) + (header[30] << 16) + (header[31] << 24);
+	//size_t blockalign = header[32] + (header[33] << 8);
+	size_t bitspersample = header[34] + (header[35] << 8);
+
+	if (strncmp((char *)header + 36, "data", 4) !=0) {
+		con_warn << "Error reading " << filename << ": invalid data header!" << std::endl;
+		filesystem::close(wav_file);
+		return 0;
+	}
+
+	size_t datasize = header[40] + (header[41] << 8) + (header[42] << 16) + (header[43] << 24);
+
+	PCM *pcm = new PCM(samplerate, bitspersample, channels, datasize);
+	const size_t readblocksize = channels * (bitspersample / 8);
+	size_t total_bytes = 0;
+
+	while ((wav_file->read((void *)(*pcm)[total_bytes], readblocksize)) && (total_bytes < datasize)) {
+		total_bytes += readblocksize;
+	}
+
+	if (total_bytes < datasize) {
+		con_warn << "Error reading " << filename << ": file truncated!" << std::endl;
+	}
+
+	con_print << "  " << filename << " " << pcm->samplerate()<< "Hz " << pcm->bitspersample() << "bit " <<  
+			pcm->channels() << " chan " << pcm->size() << " bytes" << std::endl;
+
+	filesystem::close(wav_file);
+	return pcm;
+}
+
+}
diff --git a/src/audio/wav.h b/src/audio/wav.h
new file mode 100644
index 0000000..a94b6fb
--- /dev/null
+++ b/src/audio/wav.h
@@ -0,0 +1,22 @@
+/*
+   audio/wav.h
+   This file is part of the Osirion project and is distributed under
+   the terms of the GNU General Public License version 2
+*/
+
+#ifndef __INCLUDED_AUDIO_WAV_H__
+#define __INCLUDED_AUDIO_WAV_H__
+
+#include "audio/pcm.h"
+
+namespace audio {
+
+/// class to read microsoft PCM wav files
+class Wav {
+public:
+	static PCM *load(std::string const & name);
+};
+
+}
+
+#endif // __INCLUDED_AUDIO_WAV_H__