Code-Bin #146 - Spliting up the channels

Spliting up the channels
Posted by: aquawicket | March 21, 2008 @ 3:58pm

C++ Code

int AudioProc::CallBack( const void *inputBuffer, void *outputBuffer, unsigned long framesPerBuffer,
			 const PaStreamCallbackTimeInfo* timeInfo, PaStreamCallbackFlags statusFlags, void *userData )
{
	Device *thisDevice = (Device*)userData;  //This holds the device info we need

//We need to split the signal up into channels
        float *input = (float*)inputBuffer;

std::vector<float*>channel(thisDevice->inDev.channelCount); //make an array for the number of channels

for (unsigned int f=0;f<(unsigned)framesPerBuffer;f++) {
		for(int i=0; i< thisDevice->inDev.channelCount; i++){
			*channel[i]++ = *input++;   <--- OUCH..   can't ++ a vector pointer. 
		}
	}

///////////////////////////////////////////////////////////////////////////////////////

//On the other hand..  something like this works...
        //Lets pretend I have 3 channels

float *input = (float*)inputBuffer;
        float* channel_1 = (float*)inputBuffer;
        float* channel_2 = (float*)inputBuffer;
        float* channel_3 = (float*)inputBuffer;

for (unsigned int f=0;f<(unsigned)framesPerBuffer;f++) {
        	*channel_1++ = *output++  
                *channel_2++ = *output++  
                *channel_3++ = *output++  
	}

//So how can I do this with a pointer array like  *channel[n]  ???

return 0;
}

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Author Comments

Spliting the channels into an array is the idea channel[n]

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