1159 lines
31 KiB
C
1159 lines
31 KiB
C
/**
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* OpenAL cross platform audio library
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* Copyright (C) 1999-2007 by authors.
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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* Or go to http://www.gnu.org/copyleft/lgpl.html
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*/
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#define _CRT_SECURE_NO_DEPRECATE // get rid of sprintf security warnings on VS2005
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#include "config.h"
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#include <math.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <memory.h>
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#include "alMain.h"
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#include "alSource.h"
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#include "AL/al.h"
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#include "AL/alc.h"
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///////////////////////////////////////////////////////
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// DEBUG INFORMATION
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char szDebug[256];
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///////////////////////////////////////////////////////
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#define EmptyFuncs { NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL }
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struct {
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const char *name;
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void (*Init)(BackendFuncs*);
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BackendFuncs Funcs;
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} BackendList[] = {
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#ifdef HAVE_ALSA
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{ "alsa", alc_alsa_init, EmptyFuncs },
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#endif
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#ifdef HAVE_OSS
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{ "oss", alc_oss_init, EmptyFuncs },
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#endif
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#ifdef HAVE_DSOUND
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{ "dsound", alcDSoundInit, EmptyFuncs },
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#endif
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#ifdef HAVE_WINMM
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{ "winmm", alcWinMMInit, EmptyFuncs },
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#endif
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{ NULL, NULL, EmptyFuncs }
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};
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#undef EmptyFuncs
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///////////////////////////////////////////////////////
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#define ALC_EFX_MAJOR_VERSION 0x20001
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#define ALC_EFX_MINOR_VERSION 0x20002
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#define ALC_MAX_AUXILIARY_SENDS 0x20003
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///////////////////////////////////////////////////////
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// STRING and EXTENSIONS
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typedef struct ALCextension_struct
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{
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ALCchar *extName;
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ALvoid *address;
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} ALCextension;
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typedef struct ALCfunction_struct
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{
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ALCchar *funcName;
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ALvoid *address;
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} ALCfunction;
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static ALCextension alcExtensions[] = {
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{ "ALC_ENUMERATE_ALL_EXT", (ALvoid *) NULL },
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{ "ALC_ENUMERATION_EXT", (ALvoid *) NULL },
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{ "ALC_EXT_CAPTURE", (ALvoid *) NULL },
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{ "ALC_EXT_EFX", (ALvoid *) NULL },
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{ NULL, (ALvoid *) NULL }
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};
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static ALCfunction alcFunctions[] = {
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{ "alcCreateContext", (ALvoid *) alcCreateContext },
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{ "alcMakeContextCurrent", (ALvoid *) alcMakeContextCurrent },
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{ "alcProcessContext", (ALvoid *) alcProcessContext },
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{ "alcSuspendContext", (ALvoid *) alcSuspendContext },
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{ "alcDestroyContext", (ALvoid *) alcDestroyContext },
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{ "alcGetCurrentContext", (ALvoid *) alcGetCurrentContext },
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{ "alcGetContextsDevice", (ALvoid *) alcGetContextsDevice },
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{ "alcOpenDevice", (ALvoid *) alcOpenDevice },
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{ "alcCloseDevice", (ALvoid *) alcCloseDevice },
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{ "alcGetError", (ALvoid *) alcGetError },
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{ "alcIsExtensionPresent", (ALvoid *) alcIsExtensionPresent },
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{ "alcGetProcAddress", (ALvoid *) alcGetProcAddress },
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{ "alcGetEnumValue", (ALvoid *) alcGetEnumValue },
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{ "alcGetString", (ALvoid *) alcGetString },
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{ "alcGetIntegerv", (ALvoid *) alcGetIntegerv },
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{ "alcCaptureOpenDevice", (ALvoid *) alcCaptureOpenDevice },
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{ "alcCaptureCloseDevice", (ALvoid *) alcCaptureCloseDevice },
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{ "alcCaptureStart", (ALvoid *) alcCaptureStart },
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{ "alcCaptureStop", (ALvoid *) alcCaptureStop },
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{ "alcCaptureSamples", (ALvoid *) alcCaptureSamples },
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{ NULL, (ALvoid *) NULL }
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};
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static ALenums enumeration[]={
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// Types
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{ (ALchar *)"ALC_INVALID", ALC_INVALID },
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{ (ALchar *)"ALC_FALSE", ALC_FALSE },
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{ (ALchar *)"ALC_TRUE", ALC_TRUE },
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// ALC Properties
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{ (ALchar *)"ALC_MAJOR_VERSION", ALC_MAJOR_VERSION },
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{ (ALchar *)"ALC_MINOR_VERSION", ALC_MINOR_VERSION },
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{ (ALchar *)"ALC_ATTRIBUTES_SIZE", ALC_ATTRIBUTES_SIZE },
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{ (ALchar *)"ALC_ALL_ATTRIBUTES", ALC_ALL_ATTRIBUTES },
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{ (ALchar *)"ALC_DEFAULT_DEVICE_SPECIFIER", ALC_DEFAULT_DEVICE_SPECIFIER },
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{ (ALchar *)"ALC_DEVICE_SPECIFIER", ALC_DEVICE_SPECIFIER },
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{ (ALchar *)"ALC_ALL_DEVICES_SPECIFIER", ALC_ALL_DEVICES_SPECIFIER },
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{ (ALchar *)"ALC_DEFAULT_ALL_DEVICES_SPECIFIER", ALC_DEFAULT_ALL_DEVICES_SPECIFIER },
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{ (ALchar *)"ALC_EXTENSIONS", ALC_EXTENSIONS },
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{ (ALchar *)"ALC_FREQUENCY", ALC_FREQUENCY },
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{ (ALchar *)"ALC_REFRESH", ALC_REFRESH },
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{ (ALchar *)"ALC_SYNC", ALC_SYNC },
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{ (ALchar *)"ALC_MONO_SOURCES", ALC_MONO_SOURCES },
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{ (ALchar *)"ALC_STEREO_SOURCES", ALC_STEREO_SOURCES },
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{ (ALchar *)"ALC_CAPTURE_DEVICE_SPECIFIER", ALC_CAPTURE_DEVICE_SPECIFIER },
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{ (ALchar *)"ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER", ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER},
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{ (ALchar *)"ALC_CAPTURE_SAMPLES", ALC_CAPTURE_SAMPLES },
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// EFX Properties
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{ (ALchar *)"ALC_EFX_MAJOR_VERSION", ALC_EFX_MAJOR_VERSION },
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{ (ALchar *)"ALC_EFX_MINOR_VERSION", ALC_EFX_MINOR_VERSION },
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{ (ALchar *)"ALC_MAX_AUXILIARY_SENDS", ALC_MAX_AUXILIARY_SENDS },
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// ALC Error Message
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{ (ALchar *)"ALC_NO_ERROR", ALC_NO_ERROR },
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{ (ALchar *)"ALC_INVALID_DEVICE", ALC_INVALID_DEVICE },
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{ (ALchar *)"ALC_INVALID_CONTEXT", ALC_INVALID_CONTEXT },
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{ (ALchar *)"ALC_INVALID_ENUM", ALC_INVALID_ENUM },
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{ (ALchar *)"ALC_INVALID_VALUE", ALC_INVALID_VALUE },
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{ (ALchar *)"ALC_OUT_OF_MEMORY", ALC_OUT_OF_MEMORY },
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{ (ALchar *)NULL, (ALenum)0 }
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};
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// Error strings
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static const ALCchar alcNoError[] = "No Error";
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static const ALCchar alcErrInvalidDevice[] = "Invalid Device";
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static const ALCchar alcErrInvalidContext[] = "Invalid Context";
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static const ALCchar alcErrInvalidEnum[] = "Invalid Enum";
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static const ALCchar alcErrInvalidValue[] = "Invalid Value";
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static const ALCchar alcErrOutOfMemory[] = "Out of Memory";
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// Context strings
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static ALCchar alcDeviceList[2048];
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static ALCchar alcAllDeviceList[2048];
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static ALCchar alcCaptureDeviceList[2048];
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// Default is always the first in the list
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static ALCchar *alcDefaultDeviceSpecifier = alcDeviceList;
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static ALCchar *alcDefaultAllDeviceSpecifier = alcAllDeviceList;
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static ALCchar *alcCaptureDefaultDeviceSpecifier = alcCaptureDeviceList;
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static ALCchar alcExtensionList[] = "ALC_ENUMERATE_ALL_EXT ALC_ENUMERATION_EXT ALC_EXT_CAPTURE ALC_EXT_EFX";
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static ALCint alcMajorVersion = 1;
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static ALCint alcMinorVersion = 1;
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static ALCint alcEFXMajorVersion = 1;
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static ALCint alcEFXMinorVersion = 0;
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///////////////////////////////////////////////////////
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///////////////////////////////////////////////////////
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// Global Variables
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// Context List
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static ALCcontext *g_pContextList = NULL;
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static ALCuint g_ulContextCount = 0;
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// Context Error
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static ALCenum g_eLastContextError = ALC_NO_ERROR;
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///////////////////////////////////////////////////////
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///////////////////////////////////////////////////////
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// ALC Related helper functions
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static void InitAL(void)
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{
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static int done = 0;
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if(!done)
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{
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int i;
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const char *devs;
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InitializeCriticalSection(&g_mutex);
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ALTHUNK_INIT();
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ReadALConfig();
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devs = GetConfigValue(NULL, "drivers", "");
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if(devs[0])
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{
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int n;
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size_t len;
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const char *next = devs;
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i = 0;
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do {
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devs = next;
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next = strchr(devs, ',');
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if(!devs[0] || devs[0] == ',')
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continue;
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len = (next ? ((size_t)(next-devs)) : strlen(devs));
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for(n = i;BackendList[n].Init;n++)
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{
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if(len == strlen(BackendList[n].name) &&
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strncmp(BackendList[n].name, devs, len) == 0)
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{
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const char *name = BackendList[i].name;
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void (*Init)(BackendFuncs*) = BackendList[i].Init;
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BackendList[i].name = BackendList[n].name;
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BackendList[i].Init = BackendList[n].Init;
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BackendList[n].name = name;
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BackendList[n].Init = Init;
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i++;
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}
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}
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} while(next++);
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BackendList[i].name = NULL;
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BackendList[i].Init = NULL;
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}
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for(i = 0;BackendList[i].Init;i++)
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BackendList[i].Init(&BackendList[i].Funcs);
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done = 1;
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}
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}
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ALCchar *AppendDeviceList(char *name)
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{
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static int pos;
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ALCchar *ret = alcDeviceList+pos;
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pos += snprintf(alcDeviceList+pos, sizeof(alcDeviceList)-pos, "%s", name) + 1;
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return ret;
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}
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ALCchar *AppendAllDeviceList(char *name)
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{
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static int pos;
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ALCchar *ret = alcAllDeviceList+pos;
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pos += snprintf(alcAllDeviceList+pos, sizeof(alcAllDeviceList)-pos, "%s", name) + 1;
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return ret;
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}
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ALCchar *AppendCaptureDeviceList(char *name)
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{
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static int pos;
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ALCchar *ret = alcCaptureDeviceList+pos;
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pos += snprintf(alcCaptureDeviceList+pos, sizeof(alcCaptureDeviceList)-pos, "%s", name) + 1;
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return ret;
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}
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/*
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IsContext
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Check pContext is a valid Context pointer
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*/
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static ALCboolean IsContext(ALCcontext *pContext)
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{
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ALCcontext *pTempContext;
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pTempContext = g_pContextList;
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while (pTempContext && pTempContext != pContext)
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pTempContext = pTempContext->next;
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return (pTempContext ? ALC_TRUE : ALC_FALSE);
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}
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/*
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SetALCError
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Store latest ALC Error
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*/
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ALCvoid SetALCError(ALenum errorCode)
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{
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g_eLastContextError = errorCode;
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}
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/*
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SuspendContext
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Thread-safe entry
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*/
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ALCvoid SuspendContext(ALCcontext *pContext)
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{
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(void)pContext;
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EnterCriticalSection(&g_mutex);
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}
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/*
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ProcessContext
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Thread-safe exit
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*/
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ALCvoid ProcessContext(ALCcontext *pContext)
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{
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(void)pContext;
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LeaveCriticalSection(&g_mutex);
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}
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/*
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InitContext
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Initialize Context variables
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*/
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static ALvoid InitContext(ALCcontext *pContext)
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{
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//Initialise listener
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pContext->Listener.Gain = 1.0f;
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pContext->Listener.MetersPerUnit = 1.0f;
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pContext->Listener.Position[0] = 0.0f;
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pContext->Listener.Position[1] = 0.0f;
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pContext->Listener.Position[2] = 0.0f;
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pContext->Listener.Velocity[0] = 0.0f;
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pContext->Listener.Velocity[1] = 0.0f;
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pContext->Listener.Velocity[2] = 0.0f;
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pContext->Listener.Forward[0] = 0.0f;
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pContext->Listener.Forward[1] = 0.0f;
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pContext->Listener.Forward[2] = -1.0f;
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pContext->Listener.Up[0] = 0.0f;
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pContext->Listener.Up[1] = 1.0f;
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pContext->Listener.Up[2] = 0.0f;
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//Validate pContext
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pContext->LastError = AL_NO_ERROR;
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pContext->InUse = AL_FALSE;
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//Set output format
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pContext->Frequency = pContext->Device->Frequency;
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//Set globals
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pContext->DistanceModel = AL_INVERSE_DISTANCE_CLAMPED;
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pContext->DopplerFactor = 1.0f;
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pContext->DopplerVelocity = 1.0f;
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pContext->flSpeedOfSound = SPEEDOFSOUNDMETRESPERSEC;
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pContext->lNumStereoSources = 1;
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pContext->lNumMonoSources = pContext->Device->MaxNoOfSources - pContext->lNumStereoSources;
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strcpy(pContext->ExtensionList, "AL_EXT_EXPONENT_DISTANCE AL_EXT_LINEAR_DISTANCE AL_EXT_OFFSET");
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}
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/*
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ExitContext
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Clean up Context, destroy any remaining Sources
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*/
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static ALCvoid ExitContext(ALCcontext *pContext)
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{
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unsigned int i;
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ALsource *ALSource;
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ALsource *ALTempSource;
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#ifdef _DEBUG
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if (pContext->SourceCount>0)
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AL_PRINT("alcDestroyContext() %d Source(s) NOT deleted\n", pContext->SourceCount);
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#endif
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// Free all the Sources still remaining
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ALSource = pContext->Source;
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for (i = 0; i < pContext->SourceCount; i++)
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{
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ALTempSource = ALSource->next;
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ALTHUNK_REMOVEENTRY(ALSource->source);
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memset(ALSource, 0, sizeof(ALsource));
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free(ALSource);
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ALSource = ALTempSource;
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}
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//Invalidate context
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pContext->LastError = AL_NO_ERROR;
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pContext->InUse = AL_FALSE;
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}
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///////////////////////////////////////////////////////
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///////////////////////////////////////////////////////
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// ALC Functions calls
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// This should probably move to another c file but for now ...
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ALCAPI ALCdevice* ALCAPIENTRY alcCaptureOpenDevice(const ALCchar *deviceName, ALCuint frequency, ALCenum format, ALCsizei SampleSize)
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{
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ALCboolean DeviceFound = ALC_FALSE;
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ALCdevice *pDevice = NULL;
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ALCint i;
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InitAL();
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pDevice = malloc(sizeof(ALCdevice));
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if (pDevice)
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{
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if (SampleSize > 0)
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{
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//Initialise device structure
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memset(pDevice, 0, sizeof(ALCdevice));
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//Validate device
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pDevice->InUse = AL_TRUE;
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pDevice->IsCaptureDevice = AL_TRUE;
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pDevice->Frequency = frequency;
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pDevice->Format = format;
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pDevice->Channels = aluChannelsFromFormat(format);
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pDevice->FrameSize = aluBytesFromFormat(format) *
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pDevice->Channels;
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for(i = 0;BackendList[i].Init;i++)
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{
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pDevice->Funcs = &BackendList[i].Funcs;
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if(ALCdevice_OpenCapture(pDevice, deviceName, frequency, format, SampleSize))
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{
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DeviceFound = ALC_TRUE;
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break;
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}
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}
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}
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else
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SetALCError(ALC_INVALID_VALUE);
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if(!DeviceFound)
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{
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free(pDevice);
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pDevice = NULL;
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}
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}
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else
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SetALCError(ALC_OUT_OF_MEMORY);
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return pDevice;
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}
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ALCAPI ALCboolean ALCAPIENTRY alcCaptureCloseDevice(ALCdevice *pDevice)
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{
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ALCboolean bReturn = ALC_FALSE;
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if ((pDevice)&&(pDevice->IsCaptureDevice))
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{
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ALCdevice_CloseCapture(pDevice);
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free(pDevice);
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bReturn = ALC_TRUE;
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}
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else
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SetALCError(ALC_INVALID_DEVICE);
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return bReturn;
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}
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ALCAPI void ALCAPIENTRY alcCaptureStart(ALCdevice *pDevice)
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{
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if ((pDevice)&&(pDevice->IsCaptureDevice))
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ALCdevice_StartCapture(pDevice);
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else
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SetALCError(ALC_INVALID_DEVICE);
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}
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ALCAPI void ALCAPIENTRY alcCaptureStop(ALCdevice *pDevice)
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{
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if ((pDevice)&&(pDevice->IsCaptureDevice))
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ALCdevice_StopCapture(pDevice);
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else
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SetALCError(ALC_INVALID_DEVICE);
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}
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ALCAPI void ALCAPIENTRY alcCaptureSamples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCsizei lSamples)
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{
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if ((pDevice) && (pDevice->IsCaptureDevice))
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ALCdevice_CaptureSamples(pDevice, pBuffer, lSamples);
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else
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SetALCError(ALC_INVALID_DEVICE);
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}
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/*
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alcGetError
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Return last ALC generated error code
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*/
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ALCAPI ALCenum ALCAPIENTRY alcGetError(ALCdevice *device)
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{
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ALCenum errorCode;
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(void)device;
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errorCode = g_eLastContextError;
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g_eLastContextError = ALC_NO_ERROR;
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return errorCode;
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}
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/*
|
|
alcSuspendContext
|
|
|
|
Not functional
|
|
*/
|
|
ALCAPI ALCvoid ALCAPIENTRY alcSuspendContext(ALCcontext *pContext)
|
|
{
|
|
// Not a lot happens here !
|
|
(void)pContext;
|
|
}
|
|
|
|
|
|
/*
|
|
alcProcessContext
|
|
|
|
Not functional
|
|
*/
|
|
ALCAPI ALCvoid ALCAPIENTRY alcProcessContext(ALCcontext *pContext)
|
|
{
|
|
// Not a lot happens here !
|
|
(void)pContext;
|
|
}
|
|
|
|
|
|
/*
|
|
alcGetString
|
|
|
|
Returns information about the Device, and error strings
|
|
*/
|
|
ALCAPI const ALCchar* ALCAPIENTRY alcGetString(ALCdevice *pDevice,ALCenum param)
|
|
{
|
|
const ALCchar *value = NULL;
|
|
|
|
InitAL();
|
|
|
|
switch (param)
|
|
{
|
|
case ALC_NO_ERROR:
|
|
value = alcNoError;
|
|
break;
|
|
|
|
case ALC_INVALID_ENUM:
|
|
value = alcErrInvalidEnum;
|
|
break;
|
|
|
|
case ALC_INVALID_VALUE:
|
|
value = alcErrInvalidValue;
|
|
break;
|
|
|
|
case ALC_INVALID_DEVICE:
|
|
value = alcErrInvalidDevice;
|
|
break;
|
|
|
|
case ALC_INVALID_CONTEXT:
|
|
value = alcErrInvalidContext;
|
|
break;
|
|
|
|
case ALC_OUT_OF_MEMORY:
|
|
value = alcErrOutOfMemory;
|
|
break;
|
|
|
|
case ALC_DEFAULT_DEVICE_SPECIFIER:
|
|
value = alcDefaultDeviceSpecifier;
|
|
break;
|
|
|
|
case ALC_DEVICE_SPECIFIER:
|
|
if (pDevice)
|
|
value = pDevice->szDeviceName;
|
|
else
|
|
value = alcDeviceList;
|
|
break;
|
|
|
|
case ALC_ALL_DEVICES_SPECIFIER:
|
|
value = alcAllDeviceList;
|
|
break;
|
|
|
|
case ALC_DEFAULT_ALL_DEVICES_SPECIFIER:
|
|
value = alcDefaultAllDeviceSpecifier;
|
|
break;
|
|
|
|
case ALC_CAPTURE_DEVICE_SPECIFIER:
|
|
if (pDevice)
|
|
value = pDevice->szDeviceName;
|
|
else
|
|
value = alcCaptureDeviceList;
|
|
break;
|
|
|
|
case ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER:
|
|
value = alcCaptureDefaultDeviceSpecifier;
|
|
break;
|
|
|
|
case ALC_EXTENSIONS:
|
|
value = alcExtensionList;
|
|
break;
|
|
|
|
default:
|
|
SetALCError(ALC_INVALID_ENUM);
|
|
break;
|
|
}
|
|
|
|
return value;
|
|
}
|
|
|
|
|
|
/*
|
|
alcGetIntegerv
|
|
|
|
Returns information about the Device and the version of Open AL
|
|
*/
|
|
ALCAPI ALCvoid ALCAPIENTRY alcGetIntegerv(ALCdevice *device,ALCenum param,ALsizei size,ALCint *data)
|
|
{
|
|
InitAL();
|
|
|
|
if ((device)&&(device->IsCaptureDevice))
|
|
{
|
|
SuspendContext(NULL);
|
|
|
|
// Capture device
|
|
switch (param)
|
|
{
|
|
case ALC_CAPTURE_SAMPLES:
|
|
if ((size) && (data))
|
|
*data = ALCdevice_AvailableSamples(device);
|
|
else
|
|
SetALCError(ALC_INVALID_VALUE);
|
|
break;
|
|
|
|
default:
|
|
SetALCError(ALC_INVALID_ENUM);
|
|
break;
|
|
}
|
|
|
|
ProcessContext(NULL);
|
|
}
|
|
else
|
|
{
|
|
if(data)
|
|
{
|
|
// Playback Device
|
|
switch (param)
|
|
{
|
|
case ALC_MAJOR_VERSION:
|
|
if(!size)
|
|
SetALCError(ALC_INVALID_VALUE);
|
|
else
|
|
*data = alcMajorVersion;
|
|
break;
|
|
|
|
case ALC_MINOR_VERSION:
|
|
if(!size)
|
|
SetALCError(ALC_INVALID_VALUE);
|
|
else
|
|
*data = alcMinorVersion;
|
|
break;
|
|
|
|
case ALC_EFX_MAJOR_VERSION:
|
|
if(!size)
|
|
SetALCError(ALC_INVALID_VALUE);
|
|
else
|
|
*data = alcEFXMajorVersion;
|
|
break;
|
|
|
|
case ALC_EFX_MINOR_VERSION:
|
|
if(!size)
|
|
SetALCError(ALC_INVALID_VALUE);
|
|
else
|
|
*data = alcEFXMinorVersion;
|
|
break;
|
|
|
|
case ALC_MAX_AUXILIARY_SENDS:
|
|
if(!size)
|
|
SetALCError(ALC_INVALID_VALUE);
|
|
else
|
|
*data = MAX_SENDS;
|
|
break;
|
|
|
|
case ALC_ATTRIBUTES_SIZE:
|
|
if(!device)
|
|
SetALCError(ALC_INVALID_DEVICE);
|
|
else if(!size)
|
|
SetALCError(ALC_INVALID_VALUE);
|
|
else
|
|
*data = 12;
|
|
break;
|
|
|
|
case ALC_ALL_ATTRIBUTES:
|
|
if(!device)
|
|
SetALCError(ALC_INVALID_DEVICE);
|
|
else if (size < 7)
|
|
SetALCError(ALC_INVALID_VALUE);
|
|
else
|
|
{
|
|
int i = 0;
|
|
|
|
data[i++] = ALC_FREQUENCY;
|
|
data[i++] = device->Frequency;
|
|
|
|
data[i++] = ALC_REFRESH;
|
|
data[i++] = device->UpdateFreq;
|
|
|
|
data[i++] = ALC_SYNC;
|
|
data[i++] = ALC_FALSE;
|
|
|
|
SuspendContext(NULL);
|
|
if(device->Context && size >= 12)
|
|
{
|
|
data[i++] = ALC_MONO_SOURCES;
|
|
data[i++] = device->Context->lNumMonoSources;
|
|
|
|
data[i++] = ALC_STEREO_SOURCES;
|
|
data[i++] = device->Context->lNumStereoSources;
|
|
|
|
data[i++] = ALC_MAX_AUXILIARY_SENDS;
|
|
data[i++] = MAX_SENDS;
|
|
}
|
|
ProcessContext(NULL);
|
|
|
|
data[i++] = 0;
|
|
}
|
|
break;
|
|
|
|
case ALC_FREQUENCY:
|
|
if(!device)
|
|
SetALCError(ALC_INVALID_DEVICE);
|
|
else if(!size)
|
|
SetALCError(ALC_INVALID_VALUE);
|
|
else
|
|
*data = device->Frequency;
|
|
break;
|
|
|
|
case ALC_REFRESH:
|
|
if(!device)
|
|
SetALCError(ALC_INVALID_DEVICE);
|
|
else if(!size)
|
|
SetALCError(ALC_INVALID_VALUE);
|
|
else
|
|
*data = device->UpdateFreq;
|
|
break;
|
|
|
|
case ALC_SYNC:
|
|
if(!device)
|
|
SetALCError(ALC_INVALID_DEVICE);
|
|
else if(!size)
|
|
SetALCError(ALC_INVALID_VALUE);
|
|
else
|
|
*data = ALC_FALSE;
|
|
break;
|
|
|
|
default:
|
|
SetALCError(ALC_INVALID_ENUM);
|
|
break;
|
|
}
|
|
}
|
|
else if(size)
|
|
SetALCError(ALC_INVALID_VALUE);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
/*
|
|
alcIsExtensionPresent
|
|
|
|
Determines if there is support for a particular extension
|
|
*/
|
|
ALCAPI ALCboolean ALCAPIENTRY alcIsExtensionPresent(ALCdevice *device, const ALCchar *extName)
|
|
{
|
|
ALCboolean bResult = ALC_FALSE;
|
|
ALsizei i = 0;
|
|
|
|
(void)device;
|
|
|
|
if (extName)
|
|
{
|
|
while(alcExtensions[i].extName &&
|
|
strcasecmp(alcExtensions[i].extName,extName) != 0)
|
|
i++;
|
|
|
|
if (alcExtensions[i].extName)
|
|
bResult = ALC_TRUE;
|
|
}
|
|
else
|
|
SetALCError(ALC_INVALID_VALUE);
|
|
|
|
return bResult;
|
|
}
|
|
|
|
|
|
/*
|
|
alcGetProcAddress
|
|
|
|
Retrieves the function address for a particular extension function
|
|
*/
|
|
ALCAPI ALCvoid * ALCAPIENTRY alcGetProcAddress(ALCdevice *device, const ALCchar *funcName)
|
|
{
|
|
ALCvoid *pFunction = NULL;
|
|
ALsizei i = 0;
|
|
|
|
(void)device;
|
|
|
|
if (funcName)
|
|
{
|
|
while(alcFunctions[i].funcName &&
|
|
strcmp(alcFunctions[i].funcName,funcName) != 0)
|
|
i++;
|
|
pFunction = alcFunctions[i].address;
|
|
}
|
|
else
|
|
SetALCError(ALC_INVALID_VALUE);
|
|
|
|
return pFunction;
|
|
}
|
|
|
|
|
|
/*
|
|
alcGetEnumValue
|
|
|
|
Get the value for a particular ALC Enumerated Value
|
|
*/
|
|
ALCAPI ALCenum ALCAPIENTRY alcGetEnumValue(ALCdevice *device, const ALCchar *enumName)
|
|
{
|
|
ALsizei i = 0;
|
|
ALCenum val;
|
|
|
|
(void)device;
|
|
|
|
while ((enumeration[i].enumName)&&(strcmp(enumeration[i].enumName,enumName)))
|
|
i++;
|
|
val = enumeration[i].value;
|
|
|
|
if(!enumeration[i].enumName)
|
|
SetALCError(ALC_INVALID_VALUE);
|
|
|
|
return val;
|
|
}
|
|
|
|
|
|
/*
|
|
alcCreateContext
|
|
|
|
Create and attach a Context to a particular Device.
|
|
*/
|
|
ALCAPI ALCcontext* ALCAPIENTRY alcCreateContext(ALCdevice *device, const ALCint *attrList)
|
|
{
|
|
ALCcontext *ALContext = NULL;
|
|
ALuint ulAttributeIndex, ulRequestedStereoSources;
|
|
|
|
if ((device)&&(!device->IsCaptureDevice))
|
|
{
|
|
// Reset Context Last Error code
|
|
g_eLastContextError = ALC_NO_ERROR;
|
|
|
|
// Current implementation only allows one Context per Device
|
|
if(!device->Context)
|
|
{
|
|
ALContext = calloc(1, sizeof(ALCcontext));
|
|
if(!ALContext)
|
|
{
|
|
SetALCError(ALC_OUT_OF_MEMORY);
|
|
return NULL;
|
|
}
|
|
|
|
ALContext->Device = device;
|
|
InitContext(ALContext);
|
|
|
|
device->Context = ALContext;
|
|
|
|
SuspendContext(NULL);
|
|
|
|
ALContext->next = g_pContextList;
|
|
g_pContextList = ALContext;
|
|
g_ulContextCount++;
|
|
|
|
ProcessContext(NULL);
|
|
|
|
// Check for Voice Count attributes
|
|
if (attrList)
|
|
{
|
|
ulAttributeIndex = 0;
|
|
while ((ulAttributeIndex < 10) && (attrList[ulAttributeIndex]))
|
|
{
|
|
if (attrList[ulAttributeIndex] == ALC_STEREO_SOURCES)
|
|
{
|
|
ulRequestedStereoSources = attrList[ulAttributeIndex + 1];
|
|
|
|
if (ulRequestedStereoSources > ALContext->Device->MaxNoOfSources)
|
|
ulRequestedStereoSources = ALContext->Device->MaxNoOfSources;
|
|
|
|
ALContext->lNumStereoSources = ulRequestedStereoSources;
|
|
ALContext->lNumMonoSources = ALContext->Device->MaxNoOfSources - ALContext->lNumStereoSources;
|
|
break;
|
|
}
|
|
|
|
ulAttributeIndex += 2;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
SetALCError(ALC_INVALID_VALUE);
|
|
ALContext = NULL;
|
|
}
|
|
}
|
|
else
|
|
SetALCError(ALC_INVALID_DEVICE);
|
|
|
|
return ALContext;
|
|
}
|
|
|
|
|
|
/*
|
|
alcDestroyContext
|
|
|
|
Remove a Context
|
|
*/
|
|
ALCAPI ALCvoid ALCAPIENTRY alcDestroyContext(ALCcontext *context)
|
|
{
|
|
ALCcontext **list;
|
|
|
|
// Lock context list
|
|
SuspendContext(NULL);
|
|
|
|
if (IsContext(context))
|
|
{
|
|
// Lock context
|
|
SuspendContext(context);
|
|
|
|
context->Device->Context = NULL;
|
|
|
|
list = &g_pContextList;
|
|
while(*list != context)
|
|
list = &(*list)->next;
|
|
|
|
*list = (*list)->next;
|
|
g_ulContextCount--;
|
|
|
|
// Unlock context
|
|
ProcessContext(context);
|
|
|
|
ExitContext(context);
|
|
|
|
// Free memory (MUST do this after ProcessContext)
|
|
memset(context, 0, sizeof(ALCcontext));
|
|
free(context);
|
|
}
|
|
else
|
|
SetALCError(ALC_INVALID_CONTEXT);
|
|
|
|
ProcessContext(NULL);
|
|
}
|
|
|
|
|
|
/*
|
|
alcGetCurrentContext
|
|
|
|
Returns the currently active Context
|
|
*/
|
|
ALCAPI ALCcontext * ALCAPIENTRY alcGetCurrentContext(ALCvoid)
|
|
{
|
|
ALCcontext *pContext = NULL;
|
|
|
|
SuspendContext(NULL);
|
|
|
|
pContext = g_pContextList;
|
|
while ((pContext) && (!pContext->InUse))
|
|
pContext = pContext->next;
|
|
|
|
ProcessContext(NULL);
|
|
|
|
return pContext;
|
|
}
|
|
|
|
|
|
/*
|
|
alcGetContextsDevice
|
|
|
|
Returns the Device that a particular Context is attached to
|
|
*/
|
|
ALCAPI ALCdevice* ALCAPIENTRY alcGetContextsDevice(ALCcontext *pContext)
|
|
{
|
|
ALCdevice *pDevice = NULL;
|
|
|
|
SuspendContext(NULL);
|
|
if (IsContext(pContext))
|
|
pDevice = pContext->Device;
|
|
else
|
|
SetALCError(ALC_INVALID_CONTEXT);
|
|
ProcessContext(NULL);
|
|
|
|
return pDevice;
|
|
}
|
|
|
|
|
|
/*
|
|
alcMakeContextCurrent
|
|
|
|
Makes the given Context the active Context
|
|
*/
|
|
ALCAPI ALCboolean ALCAPIENTRY alcMakeContextCurrent(ALCcontext *context)
|
|
{
|
|
ALCcontext *ALContext;
|
|
ALboolean bReturn = AL_TRUE;
|
|
|
|
SuspendContext(NULL);
|
|
|
|
// context must be a valid Context or NULL
|
|
if ((IsContext(context)) || (context == NULL))
|
|
{
|
|
if ((ALContext=alcGetCurrentContext()))
|
|
{
|
|
SuspendContext(ALContext);
|
|
ALContext->InUse=AL_FALSE;
|
|
ProcessContext(ALContext);
|
|
}
|
|
|
|
if ((ALContext=context) && (ALContext->Device))
|
|
{
|
|
SuspendContext(ALContext);
|
|
ALContext->InUse=AL_TRUE;
|
|
ProcessContext(ALContext);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
SetALCError(ALC_INVALID_CONTEXT);
|
|
bReturn = AL_FALSE;
|
|
}
|
|
|
|
ProcessContext(NULL);
|
|
|
|
return bReturn;
|
|
}
|
|
|
|
|
|
/*
|
|
alcOpenDevice
|
|
|
|
Open the Device specified.
|
|
*/
|
|
ALCAPI ALCdevice* ALCAPIENTRY alcOpenDevice(const ALCchar *deviceName)
|
|
{
|
|
ALboolean bDeviceFound = AL_FALSE;
|
|
ALCdevice *device;
|
|
ALint i;
|
|
|
|
InitAL();
|
|
|
|
device = malloc(sizeof(ALCdevice));
|
|
if (device)
|
|
{
|
|
const char *fmt;
|
|
|
|
//Initialise device structure
|
|
memset(device, 0, sizeof(ALCdevice));
|
|
|
|
//Validate device
|
|
device->InUse = AL_TRUE;
|
|
device->IsCaptureDevice = AL_FALSE;
|
|
|
|
//Set output format
|
|
device->Frequency = GetConfigValueInt(NULL, "frequency", SWMIXER_OUTPUT_RATE);
|
|
if((ALint)device->Frequency <= 0)
|
|
device->Frequency = SWMIXER_OUTPUT_RATE;
|
|
|
|
fmt = GetConfigValue(NULL, "format", "AL_FORMAT_STEREO16");
|
|
if(fmt[0])
|
|
device->Format = alGetEnumValue(fmt);
|
|
|
|
device->Channels = aluChannelsFromFormat(device->Format);
|
|
if(!device->Channels)
|
|
{
|
|
device->Format = AL_FORMAT_STEREO16;
|
|
device->Channels = 2;
|
|
device->FrameSize = 4;
|
|
}
|
|
else
|
|
device->FrameSize = aluBytesFromFormat(device->Format) *
|
|
device->Channels;
|
|
|
|
device->UpdateFreq = GetConfigValueInt(NULL, "refresh", 0);
|
|
if((ALint)device->UpdateFreq <= 0)
|
|
device->UpdateFreq = 8192 * device->Frequency / 22050;
|
|
|
|
// Find a playback device to open
|
|
for(i = 0;BackendList[i].Init;i++)
|
|
{
|
|
device->Funcs = &BackendList[i].Funcs;
|
|
if(ALCdevice_OpenPlayback(device, deviceName))
|
|
{
|
|
bDeviceFound = AL_TRUE;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!bDeviceFound)
|
|
{
|
|
// No suitable output device found
|
|
free(device);
|
|
device = NULL;
|
|
}
|
|
}
|
|
|
|
return device;
|
|
}
|
|
|
|
|
|
/*
|
|
alcCloseDevice
|
|
|
|
Close the specified Device
|
|
*/
|
|
ALCAPI ALCboolean ALCAPIENTRY alcCloseDevice(ALCdevice *pDevice)
|
|
{
|
|
ALCboolean bReturn = ALC_FALSE;
|
|
|
|
if ((pDevice)&&(!pDevice->IsCaptureDevice))
|
|
{
|
|
ALCdevice_ClosePlayback(pDevice);
|
|
|
|
//Release device structure
|
|
memset(pDevice, 0, sizeof(ALCdevice));
|
|
free(pDevice);
|
|
|
|
bReturn = ALC_TRUE;
|
|
}
|
|
else
|
|
SetALCError(ALC_INVALID_DEVICE);
|
|
|
|
return bReturn;
|
|
}
|
|
///////////////////////////////////////////////////////
|