Mercurial > audio-send

     1 #ifndef _ALU_H_

     2 #define _ALU_H_

     3 

     4 #include "AL/al.h"

     5 #include "AL/alc.h"

     6 #include "AL/alext.h"

     7 

     8 #include <limits.h>

     9 #include <math.h>

    10 #ifdef HAVE_FLOAT_H

    11 #include <float.h>

    12 #endif

    13 #ifdef HAVE_IEEEFP_H

    14 #include <ieeefp.h>

    15 #endif

    16 

    17 #ifndef M_PI

    18 #define M_PI           3.14159265358979323846  /* pi */

    19 #define M_PI_2         1.57079632679489661923  /* pi/2 */

    20 #endif

    21 

    22 #ifdef HAVE_POWF

    23 #define aluPow(x,y) (powf((x),(y)))

    24 #else

    25 #define aluPow(x,y) ((ALfloat)pow((double)(x),(double)(y)))

    26 #endif

    27 

    28 #ifdef HAVE_SQRTF

    29 #define aluSqrt(x) (sqrtf((x)))

    30 #else

    31 #define aluSqrt(x) ((ALfloat)sqrt((double)(x)))

    32 #endif

    33 

    34 #ifdef HAVE_ACOSF

    35 #define aluAcos(x) (acosf((x)))

    36 #else

    37 #define aluAcos(x) ((ALfloat)acos((double)(x)))

    38 #endif

    39 

    40 #ifdef HAVE_ATANF

    41 #define aluAtan(x) (atanf((x)))

    42 #else

    43 #define aluAtan(x) ((ALfloat)atan((double)(x)))

    44 #endif

    45 

    46 #ifdef HAVE_FABSF

    47 #define aluFabs(x) (fabsf((x)))

    48 #else

    49 #define aluFabs(x) ((ALfloat)fabs((double)(x)))

    50 #endif

    51 

    52 #define QUADRANT_NUM  128

    53 #define LUT_NUM       (4 * QUADRANT_NUM)

    54 

    55 #ifdef __cplusplus

    56 extern "C" {

    57 #endif

    58 

    59 struct ALsource;

    60 struct ALbuffer;

    61 

    62 typedef ALvoid (*MixerFunc)(struct ALsource *self, ALCdevice *Device,

    63                             const ALvoid *RESTRICT data,

    64                             ALuint *DataPosInt, ALuint *DataPosFrac,

    65                             ALuint OutPos, ALuint SamplesToDo,

    66                             ALuint BufferSize);

    67 

    68 enum Resampler {

    69     POINT_RESAMPLER = 0,

    70     LINEAR_RESAMPLER,

    71     CUBIC_RESAMPLER,

    72 

    73     RESAMPLER_MAX,

    74     RESAMPLER_MIN = -1,

    75     RESAMPLER_DEFAULT = LINEAR_RESAMPLER

    76 };

    77 

    78 enum Channel {

    79     FRONT_LEFT = 0,

    80     FRONT_RIGHT,

    81     FRONT_CENTER,

    82     LFE,

    83     BACK_LEFT,

    84     BACK_RIGHT,

    85     BACK_CENTER,

    86     SIDE_LEFT,

    87     SIDE_RIGHT,

    88 

    89     MAXCHANNELS

    90 };

    91 

    92 enum DistanceModel {

    93     InverseDistanceClamped  = AL_INVERSE_DISTANCE_CLAMPED,

    94     LinearDistanceClamped   = AL_LINEAR_DISTANCE_CLAMPED,

    95     ExponentDistanceClamped = AL_EXPONENT_DISTANCE_CLAMPED,

    96     InverseDistance  = AL_INVERSE_DISTANCE,

    97     LinearDistance   = AL_LINEAR_DISTANCE,

    98     ExponentDistance = AL_EXPONENT_DISTANCE,

    99     DisableDistance  = AL_NONE

   100 };

   101 

   102 #define BUFFERSIZE 4096

   103 

   104 #define FRACTIONBITS (14)

   105 #define FRACTIONONE  (1<<FRACTIONBITS)

   106 #define FRACTIONMASK (FRACTIONONE-1)

   107 

   108 /* Size for temporary stack storage of buffer data. Larger values need more

   109  * stack, while smaller values may need more iterations. The value needs to be

   110  * a sensible size, however, as it constrains the max stepping value used for

   111  * mixing.

   112  * The mixer requires being able to do two samplings per mixing loop. A 16KB

   113  * buffer can hold 512 sample frames for a 7.1 float buffer. With the cubic

   114  * resampler (which requires 3 padding sample frames), this limits the maximum

   115  * step to about 508. This means that buffer_freq*source_pitch cannot exceed

   116  * device_freq*508 for an 8-channel 32-bit buffer. */

   117 #ifndef STACK_DATA_SIZE

   118 #define STACK_DATA_SIZE  16384

   119 #endif

   120 

   121 

   122 static __inline ALfloat minf(ALfloat a, ALfloat b)

   123 { return ((a > b) ? b : a); }

   124 static __inline ALfloat maxf(ALfloat a, ALfloat b)

   125 { return ((a > b) ? a : b); }

   126 static __inline ALfloat clampf(ALfloat val, ALfloat min, ALfloat max)

   127 { return minf(max, maxf(min, val)); }

   128 

   129 static __inline ALuint minu(ALuint a, ALuint b)

   130 { return ((a > b) ? b : a); }

   131 static __inline ALuint maxu(ALuint a, ALuint b)

   132 { return ((a > b) ? a : b); }

   133 static __inline ALuint clampu(ALuint val, ALuint min, ALuint max)

   134 { return minu(max, maxu(min, val)); }

   135 

   136 static __inline ALint mini(ALint a, ALint b)

   137 { return ((a > b) ? b : a); }

   138 static __inline ALint maxi(ALint a, ALint b)

   139 { return ((a > b) ? a : b); }

   140 static __inline ALint clampi(ALint val, ALint min, ALint max)

   141 { return mini(max, maxi(min, val)); }

   142 

   143 

   144 static __inline ALdouble lerp(ALdouble val1, ALdouble val2, ALdouble mu)

   145 {

   146     return val1 + (val2-val1)*mu;

   147 }

   148 static __inline ALdouble cubic(ALdouble val0, ALdouble val1, ALdouble val2, ALdouble val3, ALdouble mu)

   149 {

   150     ALdouble mu2 = mu*mu;

   151     ALdouble a0 = -0.5*val0 +  1.5*val1 + -1.5*val2 +  0.5*val3;

   152     ALdouble a1 =      val0 + -2.5*val1 +  2.0*val2 + -0.5*val3;

   153     ALdouble a2 = -0.5*val0             +  0.5*val2;

   154     ALdouble a3 =                  val1;

   155 

   156     return a0*mu*mu2 + a1*mu2 + a2*mu + a3;

   157 }

   158 

   159 ALvoid aluInitPanning(ALCdevice *Device);

   160 ALint aluCart2LUTpos(ALfloat re, ALfloat im);

   161 

   162 ALvoid CalcSourceParams(struct ALsource *ALSource, const ALCcontext *ALContext);

   163 ALvoid CalcNonAttnSourceParams(struct ALsource *ALSource, const ALCcontext *ALContext);

   164 

   165 MixerFunc SelectMixer(struct ALbuffer *Buffer, enum Resampler Resampler);

   166 MixerFunc SelectHrtfMixer(struct ALbuffer *Buffer, enum Resampler Resampler);

   167 

   168 ALvoid MixSource(struct ALsource *Source, ALCdevice *Device, ALuint SamplesToDo);

   169 

   170 ALvoid aluMixData(ALCdevice *device, ALvoid *buffer, ALsizei size);

   171 ALvoid aluHandleDisconnect(ALCdevice *device);

   172 

   173 #ifdef __cplusplus

   174 }

   175 #endif

   176 

   177 #endif

   178
author	Robert McIntyre <rlm@mit.edu>
date	Sat, 11 Feb 2012 12:25:55 -0700
parents	f9476ff7637e
children