OpenAL32/Include/alSource.h

   1 #ifndef _AL_SOURCE_H_
   2 #define _AL_SOURCE_H_
   3
   4 #define MAX_SENDS                 4
   5
   6 #include "alFilter.h"
   7 #include "alu.h"
   8 #include "AL/al.h"
   9
  10 #ifdef __cplusplus
  11 extern "C" {
  12 #endif
  13
  14 #define SRC_HISTORY_BITS   (6)
  15 #define SRC_HISTORY_LENGTH (1<<SRC_HISTORY_BITS)
  16 #define SRC_HISTORY_MASK   (SRC_HISTORY_LENGTH-1)
  17
  18 extern enum Resampler DefaultResampler;
  19
  20 extern const ALsizei ResamplerPadding[ResamplerMax];
  21 extern const ALsizei ResamplerPrePadding[ResamplerMax];
  22
  23
  24 typedef struct ALbufferlistitem
  25 {
  26     struct ALbuffer         *buffer;
  27     struct ALbufferlistitem *next;
  28     struct ALbufferlistitem *prev;
  29 } ALbufferlistitem;
  30
  31 typedef struct HrtfState {
  32     ALboolean Moving;
  33     ALuint Counter;
  34     ALIGN(16) ALfloat History[MaxChannels][SRC_HISTORY_LENGTH];
  35     ALIGN(16) ALfloat Values[MaxChannels][HRIR_LENGTH][2];
  36     ALuint Offset;
  37 } HrtfState;
  38
  39 typedef struct HrtfParams {
  40     ALfloat Gain;
  41     ALfloat Dir[3];
  42     ALIGN(16) ALfloat Coeffs[MaxChannels][HRIR_LENGTH][2];
  43     ALIGN(16) ALfloat CoeffStep[HRIR_LENGTH][2];
  44     ALuint Delay[MaxChannels][2];
  45     ALint DelayStep[2];
  46 } HrtfParams;
  47
  48 typedef struct DirectParams {
  49     HrtfParams Hrtf;
  50
  51     /* A mixing matrix. First subscript is the channel number of the input data
  52      * (regardless of channel configuration) and the second is the channel
  53      * target (eg. FrontLeft). Not used with HRTF. */
  54     ALfloat Gains[MaxChannels][MaxChannels];
  55
  56     /* A low-pass filter, using 2 chained one-pole filters. */
  57     FILTER iirFilter;
  58     ALfloat history[MaxChannels*2];
  59 } DirectParams;
  60
  61 typedef struct SendParams {
  62     /* Gain control, which applies to all input channels to a single (mono)
  63      * output buffer. */
  64     ALfloat Gain;
  65
  66     /* A low-pass filter, using 2 chained one-pole filters. */
  67     FILTER iirFilter;
  68     ALfloat history[MaxChannels*2];
  69 } SendParams;
  70
  71
  72 typedef struct ALsource
  73 {
  74     /** Source properties. */
  75     volatile ALfloat   Pitch;
  76     volatile ALfloat   Gain;
  77     volatile ALfloat   OuterGain;
  78     volatile ALfloat   MinGain;
  79     volatile ALfloat   MaxGain;
  80     volatile ALfloat   InnerAngle;
  81     volatile ALfloat   OuterAngle;
  82     volatile ALfloat   RefDistance;
  83     volatile ALfloat   MaxDistance;
  84     volatile ALfloat   RollOffFactor;
  85     volatile ALfloat   Position[3];
  86     volatile ALfloat   Velocity[3];
  87     volatile ALfloat   Orientation[3];
  88     volatile ALboolean HeadRelative;
  89     volatile ALboolean Looping;
  90     volatile enum DistanceModel DistanceModel;
  91     volatile ALboolean DirectChannels;
  92
  93     volatile ALboolean DryGainHFAuto;
  94     volatile ALboolean WetGainAuto;
  95     volatile ALboolean WetGainHFAuto;
  96     volatile ALfloat   OuterGainHF;
  97
  98     volatile ALfloat AirAbsorptionFactor;
  99     volatile ALfloat RoomRolloffFactor;
 100     volatile ALfloat DopplerFactor;
 101
 102     enum Resampler Resampler;
 103
 104     /**
 105      * Last user-specified offset, and the offset type (bytes, samples, or
 106      * seconds).
 107      */
 108     ALdouble Offset;
 109     ALenum   OffsetType;
 110
 111     /** Source type (static, streaming, or undetermined) */
 112     volatile ALint SourceType;
 113
 114     /** Source state (initial, playing, paused, or stopped) */
 115     volatile ALenum state;
 116     ALenum new_state;
 117
 118     /**
 119      * Source offset in samples, relative to the currently playing buffer, NOT
 120      * the whole queue, and the fractional (fixed-point) offset to the next
 121      * sample.
 122      */
 123     ALuint position;
 124     ALuint position_fraction;
 125
 126     /** Source Buffer Queue info. */
 127     ALbufferlistitem *queue;
 128     ALuint BuffersInQueue;
 129     ALuint BuffersPlayed;
 130
 131     /** Current buffer sample info. */
 132     ALuint NumChannels;
 133     ALuint SampleSize;
 134
 135     /** Direct filter and auxiliary send info. */
 136     ALfloat DirectGain;
 137     ALfloat DirectGainHF;
 138
 139     struct {
 140         struct ALeffectslot *Slot;
 141         ALfloat Gain;
 142         ALfloat GainHF;
 143     } Send[MAX_SENDS];
 144
 145     /** HRTF info. */
 146     HrtfState Hrtf;
 147
 148     /** Current target parameters used for mixing. */
 149     struct {
 150         DryMixerFunc DryMix;
 151         WetMixerFunc WetMix;
 152
 153         ALint Step;
 154
 155         DirectParams Direct;
 156
 157         struct ALeffectslot *Slot[MAX_SENDS];
 158         SendParams Send[MAX_SENDS];
 159     } Params;
 160     /** Source needs to update its mixing parameters. */
 161     volatile ALenum NeedsUpdate;
 162
 163     /** Method to update mixing parameters. */
 164     ALvoid (*Update)(struct ALsource *self, const ALCcontext *context);
 165
 166     /** Self ID */
 167     ALuint id;
 168 } ALsource;
 169 #define ALsource_Update(s,a)                 ((s)->Update(s,a))
 170
 171 ALvoid SetSourceState(ALsource *Source, ALCcontext *Context, ALenum state);
 172 ALboolean ApplyOffset(ALsource *Source);
 173
 174 ALvoid ReleaseALSources(ALCcontext *Context);
 175
 176 #ifdef __cplusplus
 177 }
 178 #endif
 179
 180 #endif