/* * $Id: patest_sine_time.c,v 1.1.1.1 2003-05-09 16:03:56 ggeiger Exp $ * patest_sine_time.c * Play a sine wave using the Portable Audio api for several seconds. * Pausing in the middle. * use the Pa_GetStreamTime() and Pa_IsStreamActive() calls. * * 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" #include "pa_util.h" #define NUM_SECONDS (8) #define SAMPLE_RATE (44100) #define FRAMES_PER_BUFFER (64) #define NUM_BUFFERS (0) #ifndef M_PI #define M_PI (3.14159265) #endif #define TWOPI (M_PI * 2.0) #define TABLE_SIZE (200) typedef struct { double left_phase; double right_phase; volatile PaTimestamp outTime; } 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 int i; double left_phaseInc = 0.02; double right_phaseInc = 0.06; double left_phase = data->left_phase; double right_phase = data->right_phase; (void) outTime; /* Prevent unused variable warnings. */ (void) inputBuffer; data->outTime = outTime;\ for( i=0; i TWOPI ) left_phase -= TWOPI; *out++ = (float) sin( left_phase ); right_phase += right_phaseInc; if( right_phase > TWOPI ) right_phase -= TWOPI; *out++ = (float) sin( right_phase ); } data->left_phase = left_phase; data->right_phase = right_phase; return paContinue; } /*******************************************************************/ static void ReportStreamTime( PaStream *stream, paTestData *data ); static void ReportStreamTime( PaStream *stream, paTestData *data ) { PaTimestamp streamTime, latency, outTime; streamTime = Pa_GetStreamTime( stream ); outTime = data->outTime; if( outTime < 0.0 ) { printf("Stream time = %8.1f\n", streamTime ); } else { latency = outTime - streamTime; printf("Stream time = %8.1f, outTime = %8.1f, latency = %8.1f\n", streamTime, outTime, latency ); } fflush(stdout); } /*******************************************************************/ int main(void); int main(void) { PaStream *stream; PaError err; paTestData DATA; int totalSamps; printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER); DATA.left_phase = DATA.right_phase = 0; totalSamps = NUM_SECONDS * SAMPLE_RATE; /* Play for a few seconds. */ 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 */ 0, /* default latency */ NULL, Pa_GetDefaultOutputDevice(), /* default output device */ 2, /* stereo output */ paFloat32, /* 32 bit floating point output */ 0, /* default latency */ NULL, SAMPLE_RATE, FRAMES_PER_BUFFER, /* frames per buffer */ paClipOff, /* we won't output out of range samples so don't bother clipping them */ patestCallback, &DATA ); if( err != paNoError ) goto error; /* Watch until sound is halfway finished. */ printf("Play for %d seconds.\n", NUM_SECONDS/2 ); fflush(stdout); DATA.outTime = -1.0; // mark time for callback as undefined err = Pa_StartStream( stream ); if( err != paNoError ) goto error; do { ReportStreamTime( stream, &DATA ); Pa_Sleep(100); } while( Pa_GetStreamTime( stream ) < (totalSamps/2) ); /* Stop sound until ENTER hit. */ err = Pa_StopStream( stream ); if( err != paNoError ) goto error; printf("Pause for 2 seconds.\n"); fflush(stdout); Pa_Sleep( 2000 ); DATA.outTime = -1.0; // mark time for callback as undefined err = Pa_StartStream( stream ); if( err != paNoError ) goto error; printf("Play until sound is finished.\n"); fflush(stdout); do { ReportStreamTime( stream, &DATA ); Pa_Sleep(100); } while( Pa_GetStreamTime( stream ) < (totalSamps/2) ); 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; }