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Viewing changes to Alc/alcEcho.c

  • Committer: Bazaar Package Importer
  • Author(s): Andres Mejia
  • Date: 2011-04-22 18:30:58 UTC
  • mfrom: (7.1.3 sid)
  • Revision ID: james.westby@ubuntu.com-20110422183058-pgxqd8022xk3vwao
Tags: 1:1.13-2
Don't build with ALSA compatibility on non-Linux architectures.

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Lines of Context:
Alc/alcEcho.c
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    ALfloat FeedGain;
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    ALfloat Gain[MAXCHANNELS];
 
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    FILTER iirFilter;
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    ALfloat history[2];
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} ALechoState;
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ALvoid EchoDestroy(ALeffectState *effect)
 
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static ALvoid EchoDestroy(ALeffectState *effect)
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{
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    ALechoState *state = (ALechoState*)effect;
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    if(state)
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    }
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}
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ALboolean EchoDeviceUpdate(ALeffectState *effect, ALCdevice *Device)
 
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static ALboolean EchoDeviceUpdate(ALeffectState *effect, ALCdevice *Device)
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{
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    ALechoState *state = (ALechoState*)effect;
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    ALuint maxlen, i;
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    for(i = 0;i < state->BufferLength;i++)
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        state->SampleBuffer[i] = 0.0f;
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    for(i = 0;i < MAXCHANNELS;i++)
 
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        state->Gain[i] = 0.0f;
 
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    for(i = 0;i < Device->NumChan;i++)
 
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    {
 
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        Channel chan = Device->Speaker2Chan[i];
 
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        state->Gain[chan] = 1.0f;
 
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    }
 
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    return AL_TRUE;
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}
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ALvoid EchoUpdate(ALeffectState *effect, ALCcontext *Context, const ALeffect *Effect)
 
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static ALvoid EchoUpdate(ALeffectState *effect, ALCcontext *Context, const ALeffect *Effect)
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{
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    ALechoState *state = (ALechoState*)effect;
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    ALuint frequency = Context->Device->Frequency;
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    state->iirFilter.coeff = a;
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}
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ALvoid EchoProcess(ALeffectState *effect, const ALeffectslot *Slot, ALuint SamplesToDo, const ALfloat *SamplesIn, ALfloat (*SamplesOut)[OUTPUTCHANNELS])
 
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static ALvoid EchoProcess(ALeffectState *effect, const ALeffectslot *Slot, ALuint SamplesToDo, const ALfloat *SamplesIn, ALfloat (*SamplesOut)[MAXCHANNELS])
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{
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    ALechoState *state = (ALechoState*)effect;
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    const ALuint mask = state->BufferLength-1;
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        samp[0] *= gain;
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        samp[1] *= gain;
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        SamplesOut[i][FRONT_LEFT]  += samp[0];
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        SamplesOut[i][FRONT_RIGHT] += samp[1];
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        SamplesOut[i][SIDE_LEFT]   += samp[0];
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        SamplesOut[i][SIDE_RIGHT]  += samp[1];
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        SamplesOut[i][BACK_LEFT]   += samp[0];
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        SamplesOut[i][BACK_RIGHT]  += samp[1];
 
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        SamplesOut[i][FRONT_LEFT]  += state->Gain[FRONT_LEFT]  * samp[0];
 
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        SamplesOut[i][FRONT_RIGHT] += state->Gain[FRONT_RIGHT] * samp[1];
 
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        SamplesOut[i][SIDE_LEFT]   += state->Gain[SIDE_LEFT]   * samp[0];
 
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        SamplesOut[i][SIDE_RIGHT]  += state->Gain[SIDE_RIGHT]  * samp[1];
 
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        SamplesOut[i][BACK_LEFT]   += state->Gain[BACK_LEFT]   * samp[0];
 
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        SamplesOut[i][BACK_RIGHT]  += state->Gain[BACK_RIGHT]  * samp[1];
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    }
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    state->Offset = offset;
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}