diff options
Diffstat (limited to 'pd/portaudio_v18/pa_tests/debug_sine_amp.c')
| -rw-r--r-- | pd/portaudio_v18/pa_tests/debug_sine_amp.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/pd/portaudio_v18/pa_tests/debug_sine_amp.c b/pd/portaudio_v18/pa_tests/debug_sine_amp.c new file mode 100644 index 00000000..3eeca007 --- /dev/null +++ b/pd/portaudio_v18/pa_tests/debug_sine_amp.c @@ -0,0 +1,157 @@ +/* + * $Id: debug_sine_amp.c,v 1.1 2002/03/21 00:44:35 philburk Exp $ + * Play a different sine wave on each channels, + * using the Portable Audio api. + * Allos amplitude to be set interactively. + * + * Author: Phil Burk http://www.softsynth.com + * + * This program uses the PortAudio Portable Audio Library. + * For more information see: http://www.portaudio.com + * Copyright (c) 1999-2000 Ross Bencina and Phil Burk + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files + * (the "Software"), to deal in the Software without restriction, + * including without limitation the rights to use, copy, modify, merge, + * publish, distribute, sublicense, and/or sell copies of the Software, + * and to permit persons to whom the Software is furnished to do so, + * subject to the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * Any person wishing to distribute modifications to the Software is + * requested to send the modifications to the original developer so that + * they can be incorporated into the canonical version. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. + * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR + * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF + * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + * + */ +#include <stdio.h> +#include <math.h> +#include "portaudio.h" + +#define OUTPUT_DEVICE (Pa_GetDefaultOutputDeviceID()) +#define SAMPLE_RATE (44100) +#define FRAMES_PER_BUFFER (256) +#define FREQ_INCR (300.0 / SAMPLE_RATE) +#define MAX_CHANNELS (64) + +#ifndef M_PI +#define M_PI (3.14159265) +#endif + +typedef struct +{ + int numChannels; + double phases[MAX_CHANNELS]; + float amplitude; +} +paTestData; + +/* This routine will be called by the PortAudio engine when audio is needed. +** It may called at interrupt level on some machines so don't do anything +** that could mess up the system like calling malloc() or free(). +*/ +static int patestCallback( void *inputBuffer, void *outputBuffer, + unsigned long framesPerBuffer, + PaTimestamp outTime, void *userData ) +{ + paTestData *data = (paTestData*)userData; + float *out = (float*)outputBuffer; + int frameIndex, channelIndex; + (void) outTime; /* Prevent unused variable warnings. */ + (void) inputBuffer; + + for( frameIndex=0; frameIndex<(int)framesPerBuffer; frameIndex++ ) + { + for( channelIndex=0; channelIndex<data->numChannels; channelIndex++ ) + { + /* Output sine wave on every channel. */ + *out++ = (float) ( data->amplitude * sin(data->phases[channelIndex]) ); + + /* Play each channel at a higher frequency. */ + data->phases[channelIndex] += FREQ_INCR * (4 + channelIndex); + if( data->phases[channelIndex] >= (2.0 * M_PI) ) data->phases[channelIndex] -= (2.0 * M_PI); + } + } + + return 0; +} +/*******************************************************************/ +int main(void); +int main(void) +{ + char pad[256]; + PortAudioStream *stream; + PaError err; + const PaDeviceInfo *pdi; + paTestData data = {0}; + printf("PortAudio Test: output sine wave on each channel.\n" ); + + err = Pa_Initialize(); + if( err != paNoError ) goto error; + + pdi = Pa_GetDeviceInfo( OUTPUT_DEVICE ); + data.numChannels = pdi->maxOutputChannels; + if( data.numChannels > MAX_CHANNELS ) data.numChannels = MAX_CHANNELS; + printf("Number of Channels = %d\n", data.numChannels ); + data.amplitude = 1.0; + + err = Pa_OpenStream( + &stream, + paNoDevice, /* default input device */ + 0, /* no input */ + paFloat32, /* 32 bit floating point input */ + NULL, + OUTPUT_DEVICE, + data.numChannels, + paFloat32, /* 32 bit floating point output */ + NULL, + SAMPLE_RATE, + FRAMES_PER_BUFFER, /* frames per buffer */ + 0, /* number of buffers, if zero then use default minimum */ + paClipOff, /* we won't output out of range samples so don't bother clipping them */ + patestCallback, + &data ); + if( err != paNoError ) goto error; + + err = Pa_StartStream( stream ); + if( err != paNoError ) goto error; + + do + { + printf("Current amplitude = %f\n", data.amplitude ); + printf("Enter new amplitude or 'q' to quit.\n"); + fflush(stdout); + gets( pad ); + if( pad[0] != 'q' ) + { + // I tried to use atof but it seems to be broken on Mac OS X 10.1 + float amp; + sscanf( pad, "%f", & ); + data.amplitude = amp; + } + } while( pad[0] != 'q' ); + + err = Pa_StopStream( stream ); + if( err != paNoError ) goto error; + + Pa_CloseStream( stream ); + Pa_Terminate(); + printf("Test finished.\n"); + return err; +error: + Pa_Terminate(); + fprintf( stderr, "An error occured while using the portaudio stream\n" ); + fprintf( stderr, "Error number: %d\n", err ); + fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); + return err; +} |