int main(void)
{
PaStreamParameters outputParameters;
PaStream *stream;
PaError err;
paTestData data;
PaTime startTime;
printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER);
data.left_phase = data.right_phase = 0;
err = Pa_Initialize();
if( err != paNoError ) goto error;
outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */
outputParameters.channelCount = 2; /* stereo output */
outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */
outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
outputParameters.hostApiSpecificStreamInfo = NULL;
err = Pa_OpenStream(
&stream,
NULL, /* no input */
&outputParameters,
SAMPLE_RATE,
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;
startTime = Pa_GetStreamTime( stream );
do
{
ReportStreamTime( stream, &data );
Pa_Sleep(100);
} while( (Pa_GetStreamTime( stream ) - startTime) < (NUM_SECONDS/2) );
/* Stop sound for 2 seconds. */
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;
startTime = Pa_GetStreamTime( stream );
printf("Play until sound is finished.\n"); fflush(stdout);
do
{
ReportStreamTime( stream, &data );
Pa_Sleep(100);
} while( (Pa_GetStreamTime( stream ) - startTime) < (NUM_SECONDS/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;
}
int main(void)
{
PortAudioStream *stream;
PaError err;
paTestData DATA;
int i;
int totalSamps;
printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER);
/* initialise sinusoidal wavetable */
for( i=0; i<TABLE_SIZE; i++ )
{
DATA.sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. );
}
DATA.left_phase = DATA.right_phase = 0;
DATA.framesToGo = 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 */
NULL,
Pa_GetDefaultOutputDeviceID(), /* default output device */
2, /* stereo output */
paFloat32, /* 32 bit floating point output */
NULL,
SAMPLE_RATE,
FRAMES_PER_BUFFER, /* frames per buffer */
NUM_BUFFERS, /* 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;
DATA.outTime = -1.0; // mark time for callback as undefined
err = Pa_StartStream( stream );
if( err != paNoError ) goto error;
/* Watch until sound is halfway finished. */
printf("Play for %d seconds.\n", NUM_SECONDS/2 ); fflush(stdout);
do
{
ReportStreamTime( stream, &DATA );
Pa_Sleep(100);
} while( Pa_StreamTime( 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_StreamActive( stream ) );
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;
}
