/* * $Id: patest_hang.c,v 1.1.4.1 2003/02/11 21:41:32 philburk Exp $ * Play a sine then hang audio callback to test watchdog. * * Authors: * Ross Bencina * Phil Burk * * This program uses the PortAudio Portable Audio Library. * For more information see: http://www.audiomulch.com/portaudio/ * 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 #include #include "portaudio.h" #define SAMPLE_RATE (44100) #define FRAMES_PER_BUFFER (1024) #ifndef M_PI #define M_PI (3.14159265) #endif #define TWOPI (M_PI * 2.0) typedef struct paTestData { int sleepFor; double phase; } 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; unsigned long i; int finished = 0; double phaseInc = 0.02; double phase = data->phase; (void) outTime; /* Prevent unused variable warnings. */ (void) inputBuffer; for( i=0; i TWOPI ) phase -= TWOPI; /* This is not a very efficient way to calc sines. */ *out++ = (float) sin( phase ); /* mono */ } if( data->sleepFor > 0 ) { Pa_Sleep( data->sleepFor ); } data->phase = phase; return finished; } /*******************************************************************/ int main(void); int main(void) { PortAudioStream *stream; PaError err; int i; paTestData data = {0}; printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER ); err = Pa_Initialize(); if( err != paNoError ) goto error; err = Pa_OpenStream( &stream, paNoDevice,/* default input device */ 0, /* no input */ paFloat32, /* 32 bit floating point input */ NULL, Pa_GetDefaultOutputDeviceID(), /* default output device */ 1, /* mono output */ 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; /* Gradually increase sleep time. */ for( i=0; i<10000; i+= 1000 ) { printf("Sleep for %d milliseconds in audio callback.\n", i ); data.sleepFor = i; fflush(stdout); Pa_Sleep( ((i<1000) ? 1000 : i) ); } printf("Suffer for 10 seconds.\n"); fflush(stdout); Pa_Sleep( 10000 ); err = Pa_StopStream( stream ); if( err != paNoError ) goto error; err = Pa_CloseStream( stream ); if( err != paNoError ) goto error; 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; }