623 lines
19 KiB
C++
623 lines
19 KiB
C++
//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose: Device Common Base Class.
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//
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//=====================================================================================//
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#include "audio_pch.h"
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#define ISPEAKER_RIGHT_FRONT 0
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#define ISPEAKER_LEFT_FRONT 1
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#define ISPEAKER_RIGHT_REAR 2
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#define ISPEAKER_LEFT_REAR 3
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#define ISPEAKER_CENTER_FRONT 4
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extern Vector listener_right;
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extern void DEBUG_StartSoundMeasure(int type, int samplecount );
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extern void DEBUG_StopSoundMeasure(int type, int samplecount );
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extern bool MIX_ScaleChannelVolume( paintbuffer_t *pPaint, channel_t *pChannel, int volume[CCHANVOLUMES], int mixchans );
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inline bool FVolumeFrontNonZero( int *pvol )
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{
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return (pvol[IFRONT_RIGHT] || pvol[IFRONT_LEFT]);
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}
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inline bool FVolumeRearNonZero( int *pvol )
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{
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return (pvol[IREAR_RIGHT] || pvol[IREAR_LEFT]);
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}
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inline bool FVolumeCenterNonZero( int *pvol )
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{
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return (pvol[IFRONT_CENTER] != 0);
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}
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// fade speaker volumes to mono, based on xfade value.
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// ie: xfade 1.0 is full mono.
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// ispeaker is speaker index, cspeaker is total # of speakers
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// fmix2channels causes mono mix for 4 channel mix to mix down to 2 channels
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// this is used for the 2 speaker outpu case, which uses recombined 4 channel front/rear mixing
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static float XfadeSpeakerVolToMono( float scale, float xfade, float ispeaker, float cspeaker, bool fmix2channels )
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{
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float scale_out;
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float scale_target;
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if (cspeaker == 4 )
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{
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// mono sound distribution:
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float scale_targets[] = {0.9, 0.9, 0.9, 0.9}; // RF, LF, RR, LR
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float scale_targets2ch[] = {0.9, 0.9, 0.0, 0.0}; // RF, LF, RR, LR
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if ( fmix2channels )
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scale_target = scale_targets2ch[clamp(FastFloatToSmallInt(ispeaker), 0, 3)];
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else
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scale_target = scale_targets[clamp(FastFloatToSmallInt(ispeaker), 0, 3)];
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goto XfadeExit;
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}
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if (cspeaker == 5 )
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{
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// mono sound distribution:
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float scale_targets[] = {0.9, 0.9, 0.5, 0.5, 0.9}; // RF, LF, RR, LR, FC
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scale_target = scale_targets[(int)clamp(FastFloatToSmallInt(ispeaker), 0, 4)];
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goto XfadeExit;
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}
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// if (cspeaker == 2 )
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scale_target = 0.9; // front 2 speakers in stereo each get 50% of total volume in mono case
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XfadeExit:
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scale_out = scale + (scale_target - scale) * xfade;
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return scale_out;
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}
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// given:
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// 2d yaw angle to sound source (0-360), where 0 is listener_right
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// pitch angle to source
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// angle to speaker position (0-360), where 0 is listener_right
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// speaker index
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// speaker total count,
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// return: scale from 0-1.0 for speaker volume.
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// NOTE: as pitch angle goes to +/- 90, sound goes to mono, all speakers.
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#define PITCH_ANGLE_THRESHOLD 45.0
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#define REAR_VOL_DROP 0.5
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#define VOLCURVEPOWER 1.5 // 1.0 is a linear crossfade of volume between speakers.
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// 1.5 provides a smoother, nonlinear volume transition - this is done
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// because a volume of 255 played in a single speaker is
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// percieved as louder than 128 + 128 in two speakers
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// separated by at least 45 degrees. The nonlinear curve
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// gives the volume boost needed.
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static float GetSpeakerVol( float yaw_source, float pitch_source, float mono, float yaw_speaker, int ispeaker, int cspeaker, bool fmix2channels )
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{
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float adif = fabs(yaw_source - yaw_speaker);
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float pitch_angle = pitch_source;
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float scale = 0.0;
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float xfade = 0.0;
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if ( adif > 180 )
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adif = 360 - adif;
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// mono goes from 0.0 to 1.0 as listener moves into 'mono' radius of sound source.
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// Also, as pitch_angle to sound source approaches 90 (sound above/below listener), sounds become mono.
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// convert pitch angle to 0-90 absolute pitch
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if ( pitch_angle < 0)
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pitch_angle += 360;
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if ( pitch_angle > 180)
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pitch_angle = 360 - pitch_angle;
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if ( pitch_angle > 90)
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pitch_angle = 90 - (pitch_angle - 90);
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// calculate additional mono crossfade due to pitch angle
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if ( pitch_angle > PITCH_ANGLE_THRESHOLD )
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{
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xfade = ( pitch_angle - PITCH_ANGLE_THRESHOLD ) / ( 90.0 - PITCH_ANGLE_THRESHOLD ); // 0.0 -> 1.0 as angle 45->90
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mono += xfade;
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mono = clamp(mono, 0.0f, 1.0f);
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}
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if ( cspeaker == 2 )
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{
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// 2 speaker (headphone) mix: speakers opposing, at 0 & 180 degrees
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scale = (1.0 - powf(adif/180.0, VOLCURVEPOWER));
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goto GetVolExit;
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}
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if ( adif >= 90.0 )
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goto GetVolExit; // 0.0 scale
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if ( cspeaker == 4 )
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{
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// 4 ch surround: all speakers on 90 degree angles,
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// scale ranges from 0.0 (at 90 degree difference between source and speaker)
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// to 1.0 (0 degree difference between source and speaker)
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scale = (1.0 - powf(adif/90.0, VOLCURVEPOWER));
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goto GetVolExit;
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}
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// 5 ch surround:
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// rear speakers are on 90 degree angles and return 0.0->1.0 range over +/- 90 degrees each
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// center speaker is on 45 degree angle to left/right front speaker
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// center speaker has 0.0->1.0 range over 45 degrees
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switch (ispeaker)
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{
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default:
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case ISPEAKER_RIGHT_REAR:
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case ISPEAKER_LEFT_REAR:
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{
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// rear speakers get +/- 90 degrees of linear scaling...
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scale = (1.0 - powf(adif/90.0, VOLCURVEPOWER));
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break;
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}
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case ISPEAKER_CENTER_FRONT:
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{
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// center speaker gets +/- 45 degrees of linear scaling...
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if (adif > 45.0)
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goto GetVolExit; // 0.0 scale
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scale = (1.0 - powf(adif/45.0, VOLCURVEPOWER));
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break;
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}
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case ISPEAKER_RIGHT_FRONT:
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{
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if (yaw_source > yaw_speaker)
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{
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// if sound source is between right front speaker and center speaker,
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// apply scaling over 75 degrees...
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if (adif > 75.0)
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goto GetVolExit; // 0.0 scale
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scale = (1.0 - powf(adif/75.0, VOLCURVEPOWER));
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}
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/*
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if (yaw_source > yaw_speaker && yaw_source < (yaw_speaker + 90.0))
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{
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// if sound source is between right front speaker and center speaker,
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// apply scaling over 45 degrees...
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if (adif > 45.0)
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goto GetVolExit; // 0.0 scale
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scale = (1.0 - powf(adif/45.0, VOLCURVEPOWER));
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}
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*/
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else
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{
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// sound source is CW from right speaker, apply scaling over 90 degrees...
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scale = (1.0 - powf(adif/90.0, VOLCURVEPOWER));
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}
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break;
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}
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case ISPEAKER_LEFT_FRONT:
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{
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if (yaw_source < yaw_speaker )
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{
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// if sound source is between left front speaker and center speaker,
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// apply scaling over 75 degrees...
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if (adif > 75.0)
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goto GetVolExit; // 0.0 scale
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scale = (1.0 - powf(adif/75.0, VOLCURVEPOWER));
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}
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/*
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if (yaw_source < yaw_speaker && yaw_source > (yaw_speaker - 90.0))
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{
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// if sound source is between left front speaker and center speaker,
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// apply scaling over 45 degrees...
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if (adif > 45.0)
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goto GetVolExit; // 0.0 scale
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scale = (1.0 - powf(adif/45.0, VOLCURVEPOWER));
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}
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*/
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else
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{
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// sound source is CW from right speaker, apply scaling over 90 degrees...
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scale = (1.0 - powf(adif/90.0, VOLCURVEPOWER));
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}
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break;
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}
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}
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GetVolExit:
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Assert(mono <= 1.0 && mono >= 0.0);
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Assert(scale <= 1.0 && scale >= 0.0);
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// crossfade speaker volumes towards mono with increased pitch angle of sound source
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scale = XfadeSpeakerVolToMono( scale, mono, ispeaker, cspeaker, fmix2channels );
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Assert(scale <= 1.0 && scale >= 0.0);
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return scale;
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}
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// given unit vector from listener to sound source,
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// determine proportion of volume for sound in FL, FC, FR, RL, RR quadrants
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// Scale this proportion by the distance scalar 'gain'
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// If sound has 'mono' radius, blend sound to mono over 50% of radius.
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void CAudioDeviceBase::SpatializeChannel( int volume[CCHANVOLUMES/2], int master_vol, const Vector& sourceDir, float gain, float mono )
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{
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VPROF("CAudioDeviceBase::SpatializeChannel");
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float rfscale, rrscale, lfscale, lrscale, fcscale;
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fcscale = rfscale = lfscale = rrscale = lrscale = 0.0;
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// clear volumes
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for (int i = 0; i < CCHANVOLUMES/2; i++)
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volume[i] = 0;
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// linear crossfader for 2, 4 or 5 speakers, using polar coord. separation angle as linear basis
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// get pitch & yaw angle from listener origin to sound source
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QAngle angles;
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float pitch;
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float source_yaw;
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float yaw;
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VectorAngles(sourceDir, angles);
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pitch = angles[PITCH];
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source_yaw = angles[YAW];
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// get 2d listener yaw angle from listener right
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QAngle angles2d;
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Vector source2d;
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float listener_yaw;
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source2d.x = listener_right.x;
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source2d.y = listener_right.y;
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source2d.z = 0.0;
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VectorNormalize(source2d);
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// convert right vector to euler angles (yaw & pitch)
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VectorAngles(source2d, angles2d);
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listener_yaw = angles2d[YAW];
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// get yaw of sound source, with listener_yaw as reference 0.
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yaw = source_yaw - listener_yaw;
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if (yaw < 0)
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yaw += 360;
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if ( !m_bSurround )
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{
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// 2 ch stereo mixing
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if ( m_bHeadphone )
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{
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// headphone mix: (NO HRTF)
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rfscale = GetSpeakerVol( yaw, pitch, mono, 0.0, ISPEAKER_RIGHT_FRONT, 2, false);
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lfscale = GetSpeakerVol( yaw, pitch, mono, 180.0, ISPEAKER_LEFT_FRONT, 2, false );
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}
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else
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{
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// stereo speakers at 45 & 135 degrees: (mono sounds mix down to 2 channels)
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rfscale = GetSpeakerVol( yaw, pitch, mono, 45.0, ISPEAKER_RIGHT_FRONT, 4, true );
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lfscale = GetSpeakerVol( yaw, pitch, mono, 135.0, ISPEAKER_LEFT_FRONT, 4, true );
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rrscale = GetSpeakerVol( yaw, pitch, mono, 315.0, ISPEAKER_RIGHT_REAR, 4, true );
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lrscale = GetSpeakerVol( yaw, pitch, mono, 225.0, ISPEAKER_LEFT_REAR, 4, true );
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// add sounds coming from rear (quieter)
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rfscale = clamp((rfscale + rrscale * 0.75), 0.0, 1.0);
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lfscale = clamp((lfscale + lrscale * 0.75), 0.0, 1.0);
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rrscale = 0;
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lrscale = 0;
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//DevMsg("lfscale=%f rfscale=%f lrscale=%f rrscale=%f\n",lfscale,rfscale,lrscale,rrscale);
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//DevMsg("pitch=%f yaw=%f \n",pitch, yaw);
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}
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goto SpatialExit;
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}
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if ( m_bSurround && !m_bSurroundCenter )
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{
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// 4 ch surround
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// linearly scale with radial distance from asource to FR, FL, RR, RL
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// where FR = 45 degrees, FL = 135, RR = 315 (-45), RL = 225 (-135)
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rfscale = GetSpeakerVol( yaw, pitch, mono, 45.0, ISPEAKER_RIGHT_FRONT, 4, false );
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lfscale = GetSpeakerVol( yaw, pitch, mono, 135.0, ISPEAKER_LEFT_FRONT, 4, false );
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rrscale = GetSpeakerVol( yaw, pitch, mono, 315.0, ISPEAKER_RIGHT_REAR, 4, false );
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lrscale = GetSpeakerVol( yaw, pitch, mono, 225.0, ISPEAKER_LEFT_REAR, 4, false );
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// DevMsg("lfscale=%f rfscale=%f lrscale=%f rrscale=%f\n",lfscale,rfscale,lrscale,rrscale);
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// DevMsg("pitch=%f yaw=%f \n",pitch, yaw);
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goto SpatialExit;
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}
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if ( m_bSurround && m_bSurroundCenter )
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{
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// 5 ch surround
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// linearly scale with radial distance from asource to FR, FC, FL, RR, RL
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// where FR = 45 degrees, FC = 90, FL = 135, RR = 315 (-45), RL = 225 (-135)
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rfscale = GetSpeakerVol( yaw, pitch, mono, 45.0, ISPEAKER_RIGHT_FRONT, 5, false );
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fcscale = GetSpeakerVol( yaw, pitch, mono, 90.0, ISPEAKER_CENTER_FRONT, 5, false );
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lfscale = GetSpeakerVol( yaw, pitch, mono, 135.0, ISPEAKER_LEFT_FRONT, 5, false );
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rrscale = GetSpeakerVol( yaw, pitch, mono, 315.0, ISPEAKER_RIGHT_REAR, 5, false );
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lrscale = GetSpeakerVol( yaw, pitch, mono, 225.0, ISPEAKER_LEFT_REAR, 5, false );
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//DevMsg("lfscale=%f center= %f rfscale=%f lrscale=%f rrscale=%f\n",lfscale,fcscale, rfscale,lrscale,rrscale);
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//DevMsg("pitch=%f yaw=%f \n",pitch, yaw);
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goto SpatialExit;
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}
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SpatialExit:
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// scale volumes in each quadrant by distance attenuation.
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// volumes are 0-255:
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// gain is 0.0->1.0, rscale is 0.0->1.0, so scale is 0.0->1.0
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// master_vol is 0->255, so rightvol is 0->255
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volume[IFRONT_RIGHT] = (int) (master_vol * gain * rfscale);
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volume[IFRONT_LEFT] = (int) (master_vol * gain * lfscale);
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volume[IFRONT_RIGHT] = clamp( volume[IFRONT_RIGHT], 0, 255 );
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volume[IFRONT_LEFT] = clamp( volume[IFRONT_LEFT], 0, 255 );
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if ( m_bSurround )
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{
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volume[IREAR_RIGHT] = (int) (master_vol * gain * rrscale);
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volume[IREAR_LEFT] = (int) (master_vol * gain * lrscale);
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volume[IREAR_RIGHT] = clamp( volume[IREAR_RIGHT], 0, 255 );
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volume[IREAR_LEFT] = clamp( volume[IREAR_LEFT], 0, 255 );
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if ( m_bSurroundCenter )
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{
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volume[IFRONT_CENTER] = (int) (master_vol * gain * fcscale);
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volume[IFRONT_CENTER0] = 0.0;
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volume[IFRONT_CENTER] = clamp( volume[IFRONT_CENTER], 0, 255);
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}
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}
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}
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void CAudioDeviceBase::ApplyDSPEffects( int idsp, portable_samplepair_t *pbuffront, portable_samplepair_t *pbufrear, portable_samplepair_t *pbufcenter, int samplecount)
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{
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VPROF("CAudioDeviceBase::ApplyDSPEffects");
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DEBUG_StartSoundMeasure( 1, samplecount );
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DSP_Process( idsp, pbuffront, pbufrear, pbufcenter, samplecount );
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DEBUG_StopSoundMeasure( 1, samplecount );
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}
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void CAudioDeviceBase::MixBegin( int sampleCount )
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{
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MIX_ClearAllPaintBuffers( sampleCount, false );
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}
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void CAudioDeviceBase::MixUpsample( int sampleCount, int filtertype )
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{
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paintbuffer_t *pPaint = MIX_GetCurrentPaintbufferPtr();
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int ifilter = pPaint->ifilter;
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Assert (ifilter < CPAINTFILTERS);
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S_MixBufferUpsample2x( sampleCount, pPaint->pbuf, &(pPaint->fltmem[ifilter][0]), CPAINTFILTERMEM, filtertype );
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if ( pPaint->fsurround )
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{
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Assert( pPaint->pbufrear );
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S_MixBufferUpsample2x( sampleCount, pPaint->pbufrear, &(pPaint->fltmemrear[ifilter][0]), CPAINTFILTERMEM, filtertype );
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if ( pPaint->fsurround_center )
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{
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Assert( pPaint->pbufcenter );
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S_MixBufferUpsample2x( sampleCount, pPaint->pbufcenter, &(pPaint->fltmemcenter[ifilter][0]), CPAINTFILTERMEM, filtertype );
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}
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}
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// make sure on next upsample pass for this paintbuffer, new filter memory is used
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pPaint->ifilter++;
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}
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void CAudioDeviceBase::Mix8Mono( channel_t *pChannel, char *pData, int outputOffset, int inputOffset, fixedint rateScaleFix, int outCount, int timecompress )
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{
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int volume[CCHANVOLUMES];
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paintbuffer_t *pPaint = MIX_GetCurrentPaintbufferPtr();
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if ( !MIX_ScaleChannelVolume( pPaint, pChannel, volume, 1) )
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return;
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if ( FVolumeFrontNonZero(volume) )
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{
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Mix8MonoWavtype( pChannel, pPaint->pbuf + outputOffset, volume, (byte *)pData, inputOffset, rateScaleFix, outCount);
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}
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if ( pPaint->fsurround )
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{
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if ( FVolumeRearNonZero(volume) )
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{
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Assert( pPaint->pbufrear );
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Mix8MonoWavtype( pChannel, pPaint->pbufrear + outputOffset, &volume[IREAR_LEFT], (byte *)pData, inputOffset, rateScaleFix, outCount );
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}
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if ( pPaint->fsurround_center && FVolumeCenterNonZero(volume) )
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{
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Assert( pPaint->pbufcenter );
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Mix8MonoWavtype( pChannel, pPaint->pbufcenter + outputOffset, &volume[IFRONT_CENTER], (byte *)pData, inputOffset, rateScaleFix, outCount );
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}
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}
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}
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void CAudioDeviceBase::Mix8Stereo( channel_t *pChannel, char *pData, int outputOffset, int inputOffset, fixedint rateScaleFix, int outCount, int timecompress )
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{
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int volume[CCHANVOLUMES];
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|
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paintbuffer_t *pPaint = MIX_GetCurrentPaintbufferPtr();
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|
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if ( !MIX_ScaleChannelVolume( pPaint, pChannel, volume, 2 ) )
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return;
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|
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if ( FVolumeFrontNonZero(volume) )
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|
{
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Mix8StereoWavtype( pChannel, pPaint->pbuf + outputOffset, volume, (byte *)pData, inputOffset, rateScaleFix, outCount );
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}
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|
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if ( pPaint->fsurround )
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{
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if ( FVolumeRearNonZero(volume) )
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|
{
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Assert( pPaint->pbufrear );
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Mix8StereoWavtype( pChannel, pPaint->pbufrear + outputOffset, &volume[IREAR_LEFT], (byte *)pData, inputOffset, rateScaleFix, outCount );
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}
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|
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if ( pPaint->fsurround_center && FVolumeCenterNonZero(volume) )
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{
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Assert( pPaint->pbufcenter );
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Mix8StereoWavtype( pChannel, pPaint->pbufcenter + outputOffset, &volume[IFRONT_CENTER], (byte *)pData, inputOffset, rateScaleFix, outCount );
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}
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}
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}
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|
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void CAudioDeviceBase::Mix16Mono( channel_t *pChannel, short *pData, int outputOffset, int inputOffset, fixedint rateScaleFix, int outCount, int timecompress )
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|
{
|
|
int volume[CCHANVOLUMES];
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|
|
|
paintbuffer_t *pPaint = MIX_GetCurrentPaintbufferPtr();
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|
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|
if ( !MIX_ScaleChannelVolume( pPaint, pChannel, volume, 1 ) )
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|
return;
|
|
|
|
if ( FVolumeFrontNonZero(volume) )
|
|
{
|
|
Mix16MonoWavtype( pChannel, pPaint->pbuf + outputOffset, volume, pData, inputOffset, rateScaleFix, outCount );
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|
}
|
|
|
|
if ( pPaint->fsurround )
|
|
{
|
|
if ( FVolumeRearNonZero(volume) )
|
|
{
|
|
Assert( pPaint->pbufrear );
|
|
Mix16MonoWavtype( pChannel, pPaint->pbufrear + outputOffset, &volume[IREAR_LEFT], pData, inputOffset, rateScaleFix, outCount );
|
|
}
|
|
|
|
if ( pPaint->fsurround_center && FVolumeCenterNonZero(volume) )
|
|
{
|
|
Assert( pPaint->pbufcenter );
|
|
Mix16MonoWavtype( pChannel, pPaint->pbufcenter + outputOffset, &volume[IFRONT_CENTER], pData, inputOffset, rateScaleFix, outCount );
|
|
}
|
|
}
|
|
}
|
|
|
|
void CAudioDeviceBase::Mix16Stereo( channel_t *pChannel, short *pData, int outputOffset, int inputOffset, fixedint rateScaleFix, int outCount, int timecompress )
|
|
{
|
|
int volume[CCHANVOLUMES];
|
|
|
|
paintbuffer_t *pPaint = MIX_GetCurrentPaintbufferPtr();
|
|
|
|
if ( !MIX_ScaleChannelVolume( pPaint, pChannel, volume, 2 ) )
|
|
return;
|
|
|
|
if ( FVolumeFrontNonZero(volume) )
|
|
{
|
|
Mix16StereoWavtype( pChannel, pPaint->pbuf + outputOffset, volume, pData, inputOffset, rateScaleFix, outCount );
|
|
}
|
|
|
|
if ( pPaint->fsurround )
|
|
{
|
|
if ( FVolumeRearNonZero(volume) )
|
|
{
|
|
Assert( pPaint->pbufrear );
|
|
Mix16StereoWavtype( pChannel, pPaint->pbufrear + outputOffset, &volume[IREAR_LEFT], pData, inputOffset, rateScaleFix, outCount );
|
|
}
|
|
|
|
if ( pPaint->fsurround_center && FVolumeCenterNonZero(volume) )
|
|
{
|
|
Assert( pPaint->pbufcenter );
|
|
Mix16StereoWavtype( pChannel, pPaint->pbufcenter + outputOffset, &volume[IFRONT_CENTER], pData, inputOffset, rateScaleFix, outCount );
|
|
}
|
|
}
|
|
}
|
|
|
|
// Null Audio Device
|
|
class CAudioDeviceNull : public CAudioDeviceBase
|
|
{
|
|
public:
|
|
bool IsActive( void ) { return false; }
|
|
bool Init( void ) { return true; }
|
|
void Shutdown( void ) {}
|
|
void Pause( void ) {}
|
|
void UnPause( void ) {}
|
|
float MixDryVolume( void ) { return 0; }
|
|
bool Should3DMix( void ) { return false; }
|
|
void StopAllSounds( void ) {}
|
|
|
|
int PaintBegin( float, int, int ) { return 0; }
|
|
void PaintEnd( void ) {}
|
|
|
|
void SpatializeChannel( int volume[CCHANVOLUMES/2], int master_vol, const Vector& sourceDir, float gain, float mono ) {}
|
|
void ApplyDSPEffects( int idsp, portable_samplepair_t *pbuffront, portable_samplepair_t *pbufrear, portable_samplepair_t *pbufcenter, int samplecount ) {}
|
|
int GetOutputPosition( void ) { return 0; }
|
|
void ClearBuffer( void ) {}
|
|
void UpdateListener( const Vector&, const Vector&, const Vector&, const Vector& ) {}
|
|
|
|
void MixBegin( int ) {}
|
|
void MixUpsample( int sampleCount, int filtertype ) {}
|
|
|
|
void Mix8Mono( channel_t *pChannel, char *pData, int outputOffset, int inputOffset, fixedint rateScaleFix, int outCount, int timecompress ) {}
|
|
void Mix8Stereo( channel_t *pChannel, char *pData, int outputOffset, int inputOffset, fixedint rateScaleFix, int outCount, int timecompress ) {}
|
|
void Mix16Mono( channel_t *pChannel, short *pData, int outputOffset, int inputOffset, fixedint rateScaleFix, int outCount, int timecompress ) {}
|
|
void Mix16Stereo( channel_t *pChannel, short *pData, int outputOffset, int inputOffset, fixedint rateScaleFix, int outCount, int timecompress ) {}
|
|
|
|
void ChannelReset( int, int, float ) {}
|
|
void TransferSamples( int end ) {}
|
|
|
|
const char *DeviceName( void ) { return "Audio Disabled"; }
|
|
int DeviceChannels( void ) { return 2; }
|
|
int DeviceSampleBits( void ) { return 16; }
|
|
int DeviceSampleBytes( void ) { return 2; }
|
|
int DeviceDmaSpeed( void ) { return SOUND_DMA_SPEED; }
|
|
int DeviceSampleCount( void ) { return 0; }
|
|
|
|
bool IsSurround( void ) { return false; }
|
|
bool IsSurroundCenter( void ) { return false; }
|
|
bool IsHeadphone( void ) { return false; }
|
|
};
|
|
|
|
IAudioDevice *Audio_GetNullDevice( void )
|
|
{
|
|
// singeton device here
|
|
static CAudioDeviceNull nullDevice;
|
|
return &nullDevice;
|
|
} |