171 lines
4.3 KiB
C
171 lines
4.3 KiB
C
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/*
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* PortAudio Portable Real-Time Audio Library
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* Latest Version at: http://www.portaudio.com
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*
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* Copyright (c) 1999-2010 Phil Burk and Ross Bencina
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
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* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* The text above constitutes the entire PortAudio license; however,
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* the PortAudio community also makes the following non-binding requests:
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*
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* Any person wishing to distribute modifications to the Software is
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* requested to send the modifications to the original developer so that
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* they can be incorporated into the canonical version. It is also
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* requested that these non-binding requests be included along with the
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* license above.
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*/
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#include "paqa_tools.h"
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/*******************************************************************/
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void PaQa_ListAudioDevices(void)
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{
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int i, numDevices;
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const PaDeviceInfo *deviceInfo;
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numDevices = Pa_GetDeviceCount();
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for( i=0; i<numDevices; i++ )
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{
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deviceInfo = Pa_GetDeviceInfo( i );
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printf( "#%d: ", i );
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printf( "%2d in", deviceInfo->maxInputChannels );
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printf( ", %2d out", deviceInfo->maxOutputChannels );
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printf( ", %s", deviceInfo->name );
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printf( ", on %s\n", Pa_GetHostApiInfo( deviceInfo->hostApi )->name );
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}
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}
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/*******************************************************************/
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void PaQa_ConvertToFloat( const void *input, int numSamples, PaSampleFormat inFormat, float *output )
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{
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int i;
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switch( inFormat )
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{
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case paUInt8:
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{
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unsigned char *data = (unsigned char *)input;
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for( i=0; i<numSamples; i++ )
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{
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int value = *data++;
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value -= 128;
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*output++ = value / 128.0f;
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}
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}
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break;
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case paInt8:
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{
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char *data = (char *)input;
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for( i=0; i<numSamples; i++ )
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{
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int value = *data++;
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*output++ = value / 128.0f;
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}
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}
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break;
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case paInt16:
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{
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short *data = (short *)input;
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for( i=0; i<numSamples; i++ )
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{
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*output++ = *data++ / 32768.0f;
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}
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}
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break;
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case paInt32:
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{
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int *data = (int *)input;
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for( i=0; i<numSamples; i++ )
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{
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int value = (*data++) >> 8;
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float fval = (float) (value / ((double) 0x00800000));
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*output++ = fval;
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}
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}
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break;
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}
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}
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/*******************************************************************/
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void PaQa_ConvertFromFloat( const float *input, int numSamples, PaSampleFormat outFormat, void *output )
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{
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int i;
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switch( outFormat )
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{
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case paUInt8:
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{
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unsigned char *data = (unsigned char *)output;
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for( i=0; i<numSamples; i++ )
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{
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float value = *input++;
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int byte = ((int) (value * 127)) + 128;
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*data++ = (unsigned char) byte;
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}
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}
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break;
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case paInt8:
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{
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char *data = (char *)output;
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for( i=0; i<numSamples; i++ )
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{
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float value = *input++;
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int byte = (int) (value * 127);
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*data++ = (char) byte;
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}
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}
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break;
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case paInt16:
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{
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short *data = (short *)output;
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for( i=0; i<numSamples; i++ )
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{
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float value = *input++;
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// Use assymmetric conversion to avoid clipping.
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short sval = value * 32767.0;
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*data++ = sval;
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}
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}
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break;
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case paInt32:
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{
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int *data = (int *)output;
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for( i=0; i<numSamples; i++ )
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{
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float value = *input++;
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// Use assymmetric conversion to avoid clipping.
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int ival = value * ((double) 0x007FFFF0);
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ival = ival << 8;
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*data++ = ival;
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}
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}
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break;
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}
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}
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