openal-soft/OpenAL32/Include/alMain.h

#ifndef AL_MAIN_H
#define AL_MAIN_H

#include <string.h>
#include <stdio.h>
#include <stdarg.h>

#ifdef HAVE_FENV_H
#include <fenv.h>
#endif

#include "AL/al.h"
#include "AL/alc.h"
#include "AL/alext.h"

#ifdef _WIN32

#ifndef _WIN32_WINNT
#define _WIN32_WINNT 0x0500
#endif
#include <windows.h>

typedef DWORD tls_type;
#define tls_create(x) (*(x) = TlsAlloc())
#define tls_delete(x) TlsFree((x))
#define tls_get(x) TlsGetValue((x))
#define tls_set(x, a) TlsSetValue((x), (a))

#else

#include <assert.h>
#include <pthread.h>
#ifdef HAVE_PTHREAD_NP_H
#include <pthread_np.h>
#endif
#include <sys/time.h>
#include <time.h>
#include <errno.h>

#define IsBadWritePtr(a,b) (0)

typedef pthread_key_t tls_type;
#define tls_create(x) pthread_key_create((x), NULL)
#define tls_delete(x) pthread_key_delete((x))
#define tls_get(x) pthread_getspecific((x))
#define tls_set(x, a) pthread_setspecific((x), (a))

typedef pthread_mutex_t CRITICAL_SECTION;
static inline void EnterCriticalSection(CRITICAL_SECTION *cs)
{
    int ret;
    ret = pthread_mutex_lock(cs);
    assert(ret == 0);
}
static inline void LeaveCriticalSection(CRITICAL_SECTION *cs)
{
    int ret;
    ret = pthread_mutex_unlock(cs);
    assert(ret == 0);
}
static inline void InitializeCriticalSection(CRITICAL_SECTION *cs)
{
    pthread_mutexattr_t attrib;
    int ret;

    ret = pthread_mutexattr_init(&attrib);
    assert(ret == 0);

    ret = pthread_mutexattr_settype(&attrib, PTHREAD_MUTEX_RECURSIVE);
#ifdef HAVE_PTHREAD_NP_H
    if(ret != 0)
        ret = pthread_mutexattr_setkind_np(&attrib, PTHREAD_MUTEX_RECURSIVE);
#endif
    assert(ret == 0);
    ret = pthread_mutex_init(cs, &attrib);
    assert(ret == 0);

    pthread_mutexattr_destroy(&attrib);
}

static inline void DeleteCriticalSection(CRITICAL_SECTION *cs)
{
    int ret;
    ret = pthread_mutex_destroy(cs);
    assert(ret == 0);
}

/* NOTE: This wrapper isn't quite accurate as it returns an ALuint, as opposed
 * to the expected DWORD. Both are defined as unsigned 32-bit types, however.
 * Additionally, Win32 is supposed to measure the time since Windows started,
 * as opposed to the actual time. */
static inline ALuint timeGetTime(void)
{
    struct timeval tv;
    int ret;

    ret = gettimeofday(&tv, NULL);
    assert(ret == 0);

    return tv.tv_usec/1000 + tv.tv_sec*1000;
}

static inline void Sleep(ALuint t)
{
    struct timespec tv, rem;
    tv.tv_nsec = (t*1000000)%1000000000;
    tv.tv_sec = t/1000;

    while(nanosleep(&tv, &rem) == -1 && errno == EINTR)
        tv = rem;
}
#define min(x,y) (((x)<(y))?(x):(y))
#define max(x,y) (((x)>(y))?(x):(y))
#endif

#include "alListener.h"
#include "alu.h"

#ifdef __cplusplus
extern "C" {
#endif

static __inline void al_print(const char *fname, unsigned int line, const char *fmt, ...)
{
    const char *fn;
    char str[256];
    int i;

    fn = strrchr(fname, '/');
    if(!fn) fn = strrchr(fname, '\\');;
    if(!fn) fn = fname;
    else fn += 1;

    i = snprintf(str, sizeof(str), "AL lib: %s:%d: ", fn, line);
    if(i < (int)sizeof(str) && i > 0)
    {
        va_list ap;
        va_start(ap, fmt);
        vsnprintf(str+i, sizeof(str)-i, fmt, ap);
        va_end(ap);
    }
    str[sizeof(str)-1] = 0;

    fprintf(stderr, "%s", str);
}
#define AL_PRINT(...) al_print(__FILE__, __LINE__, __VA_ARGS__)


#define SWMIXER_OUTPUT_RATE        44100

#define SPEEDOFSOUNDMETRESPERSEC   (343.3f)
#define AIRABSORBGAINDBHF          (-0.05f)

#define LOWPASSFREQCUTOFF          (5000)

#define QUADRANT_NUM 128
#define LUT_NUM (4 * QUADRANT_NUM)


typedef struct {
    ALCboolean (*OpenPlayback)(ALCdevice*, const ALCchar*);
    void (*ClosePlayback)(ALCdevice*);
    ALCboolean (*ResetPlayback)(ALCdevice*);
    void (*StopPlayback)(ALCdevice*);

    ALCboolean (*OpenCapture)(ALCdevice*, const ALCchar*);
    void (*CloseCapture)(ALCdevice*);
    void (*StartCapture)(ALCdevice*);
    void (*StopCapture)(ALCdevice*);
    void (*CaptureSamples)(ALCdevice*, void*, ALCuint);
    ALCuint (*AvailableSamples)(ALCdevice*);
} BackendFuncs;

enum {
    DEVICE_PROBE,
    ALL_DEVICE_PROBE,
    CAPTURE_DEVICE_PROBE
};

void alc_alsa_init(BackendFuncs *func_list);
void alc_alsa_deinit(void);
void alc_alsa_probe(int type);
void alc_oss_init(BackendFuncs *func_list);
void alc_oss_deinit(void);
void alc_oss_probe(int type);
void alc_solaris_init(BackendFuncs *func_list);
void alc_solaris_deinit(void);
void alc_solarise_probe(int type);
void alcDSoundInit(BackendFuncs *func_list);
void alcDSoundDeinit(void);
void alcDSoundProbe(int type);
void alcWinMMInit(BackendFuncs *FuncList);
void alcWinMMDeinit(void);
void alcWinMMProbe(int type);
void alc_pa_init(BackendFuncs *func_list);
void alc_pa_deinit(void);
void alc_pa_probe(int type);
void alc_wave_init(BackendFuncs *func_list);
void alc_wave_deinit(void);
void alc_wave_probe(int type);
void alc_pulse_init(BackendFuncs *func_list);
void alc_pulse_deinit(void);
void alc_pulse_probe(int type);


struct ALCdevice_struct
{
    ALCboolean   Connected;
    ALboolean    IsCaptureDevice;

    ALuint       Frequency;
    ALuint       UpdateSize;
    ALuint       NumUpdates;
    ALenum       Format;

    ALCchar      *szDeviceName;

    // Maximum number of sources that can be created
    ALuint       MaxNoOfSources;
    // Maximum number of slots that can be created
    ALuint       AuxiliaryEffectSlotMax;

    ALint        lNumMonoSources;
    ALint        lNumStereoSources;
    ALuint       NumAuxSends;

    // Linked List of Buffers for this device
    struct ALbuffer *Buffers;
    ALuint          BufferCount;

    // Linked List of Effects for this device
    struct ALeffect *EffectList;
    ALuint          EffectCount;

    // Linked List of Filters for this device
    struct ALfilter *FilterList;
    ALuint          FilterCount;

    // Linked List of Databuffers for this device
    struct ALdatabuffer *Databuffers;
    ALuint              DatabufferCount;

    // Stereo-to-binaural filter
    struct bs2b *Bs2b;
    ALCint       Bs2bLevel;

    // Dry path buffer mix
    float DryBuffer[BUFFERSIZE][OUTPUTCHANNELS];

    // Contexts created on this device
    ALCcontext  **Contexts;
    ALuint        NumContexts;

    BackendFuncs *Funcs;
    void         *ExtraData; // For the backend's use

    ALCdevice *next;
};

#define ALCdevice_OpenPlayback(a,b)      ((a)->Funcs->OpenPlayback((a), (b)))
#define ALCdevice_ClosePlayback(a)       ((a)->Funcs->ClosePlayback((a)))
#define ALCdevice_ResetPlayback(a)       ((a)->Funcs->ResetPlayback((a)))
#define ALCdevice_StopPlayback(a)        ((a)->Funcs->StopPlayback((a)))
#define ALCdevice_OpenCapture(a,b)       ((a)->Funcs->OpenCapture((a), (b)))
#define ALCdevice_CloseCapture(a)        ((a)->Funcs->CloseCapture((a)))
#define ALCdevice_StartCapture(a)        ((a)->Funcs->StartCapture((a)))
#define ALCdevice_StopCapture(a)         ((a)->Funcs->StopCapture((a)))
#define ALCdevice_CaptureSamples(a,b,c)  ((a)->Funcs->CaptureSamples((a), (b), (c)))
#define ALCdevice_AvailableSamples(a)    ((a)->Funcs->AvailableSamples((a)))

struct ALCcontext_struct
{
    ALlistener  Listener;

    struct ALsource *Source;
    ALuint           SourceCount;

    struct ALeffectslot *AuxiliaryEffectSlot;
    ALuint               AuxiliaryEffectSlotCount;

    struct ALdatabuffer *SampleSource;
    struct ALdatabuffer *SampleSink;

    ALenum      LastError;
    ALboolean   InUse;

    ALenum      DistanceModel;

    ALfloat     DopplerFactor;
    ALfloat     DopplerVelocity;
    ALfloat     flSpeedOfSound;

    ALfloat     PanningLUT[OUTPUTCHANNELS * LUT_NUM];
    ALint       NumChan;

    ALfloat     ChannelMatrix[OUTPUTCHANNELS][OUTPUTCHANNELS];

    ALCdevice  *Device;
    const ALCchar *ExtensionList;

    ALCcontext *next;
};

ALCvoid ReleaseALC(ALCvoid);

void AppendDeviceList(const ALCchar *name);
void AppendAllDeviceList(const ALCchar *name);
void AppendCaptureDeviceList(const ALCchar *name);

ALCvoid alcSetError(ALenum errorCode);

ALCvoid SuspendContext(ALCcontext *context);
ALCvoid ProcessContext(ALCcontext *context);

ALvoid *StartThread(ALuint (*func)(ALvoid*), ALvoid *ptr);
ALuint StopThread(ALvoid *thread);

ALCcontext *GetContextSuspended(void);

typedef struct RingBuffer RingBuffer;
RingBuffer *CreateRingBuffer(ALsizei frame_size, ALsizei length);
void DestroyRingBuffer(RingBuffer *ring);
ALsizei RingBufferSize(RingBuffer *ring);
void WriteRingBuffer(RingBuffer *ring, const ALubyte *data, ALsizei len);
void ReadRingBuffer(RingBuffer *ring, ALubyte *data, ALsizei len);

void ReadALConfig(void);
void FreeALConfig(void);
const char *GetConfigValue(const char *blockName, const char *keyName, const char *def);
int GetConfigValueInt(const char *blockName, const char *keyName, int def);
float GetConfigValueFloat(const char *blockName, const char *keyName, float def);
int GetConfigValueBool(const char *blockName, const char *keyName, float def);

ALCboolean  ALCAPIENTRY alcMakeCurrent(ALCcontext *context);
ALCcontext* ALCAPIENTRY alcGetThreadContext(void);

#ifdef __cplusplus
}
#endif

#endif