BMO_state_t *bmo_pa_start(
BMO_state_t *state,
uint32_t channels,
uint32_t rate,
uint32_t buf_len,
uint32_t flags
)
{
(void)flags; // TODO
if (!state->ringbuffer) {
state->ringbuffer = bmo_init_rb(buf_len, channels);
}
state->driver_id = BMO_PORTAUDIO_DRIVER;
state->driver.pa.error_num = Pa_Initialize();
if (state->driver.pa.error_num) {
bmo_err(
"Cannot initialise PortAudio:\n"
"%s\n",
Pa_GetErrorText(state->driver.pa.error_num)
);
return NULL;
}
/* TODO should be enumerating available devices, and choosing best
option, rather than falling back on given defaults */
state->driver.pa.output_params.device = Pa_GetDefaultOutputDevice();
if (state->driver.pa.output_params.device == paNoDevice) {
bmo_err("No default portaudio output device available.\n");
}
// portaudio uses a signed int here. We are passing an unisgned int
assert(((int64_t)channels) < INT_MAX);
state->driver.pa.output_params.channelCount = (int)channels;
state->n_playback_ch = channels;
state->driver.pa.output_params.sampleFormat = paFloat32 | paNonInterleaved;
state->driver.pa.output_params.suggestedLatency = \
Pa_GetDeviceInfo(state->driver.pa.output_params.device)->defaultLowOutputLatency;
state->driver.pa.output_params.hostApiSpecificStreamInfo = NULL;
/* Open an audio I/O stream. */
bmo_debug("opening stream\n");
state->driver.pa.error_num = Pa_OpenStream(
&(state->driver.pa.stream),
NULL, // input parameters aren't accounted for yet TODO
&(state->driver.pa.output_params),
(double)rate,
(unsigned long)buf_len,
paClipOff,
_bmo_pa_process_cb,
state
);
if (state->driver.pa.error_num != paNoError) {
bmo_err(
"couldn't open portaudio stream:"
"%s\n",
Pa_GetErrorText(state->driver.pa.error_num)
);
return NULL;
}
bmo_debug("setting callbacks\n");
state->driver.pa.error_num = Pa_SetStreamFinishedCallback(
state->driver.pa.stream,
_bmo_pa_finished_cb
);
if (state->driver.pa.error_num != paNoError) {
bmo_err(
"couldn't set exit conditions for portaudio stream:"
"%s\n",
Pa_GetErrorText(state->driver.pa.error_num)
);
return NULL;
}
bmo_debug("starting stream\n");
state->driver.pa.error_num = Pa_StartStream(state->driver.pa.stream);
if (state->driver.pa.error_num != paNoError) {
bmo_err(
"couldn't start portaudio stream:"
"%s\n",
Pa_GetErrorText(state->driver.pa.error_num)
);
return NULL;
}
return state;
}
int main(void)
{
PaStreamParameters outputParameters;
PaStream *stream;
PaError err;
TestData data;
int i, j;
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. );
}
err = Pa_Initialize();
if( err != paNoError ) goto error;
outputParameters.device = Pa_GetDefaultOutputDevice();
if (outputParameters.device == paNoDevice) {
fprintf(stderr,"Error: No default output device.\n");
goto error;
}
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, /* output will be in-range, so no need to clip */
TestCallback,
&data );
if( err != paNoError ) goto error;
sprintf( data.message, "Loop: XX" );
err = Pa_SetStreamFinishedCallback( stream, &StreamFinished );
if( err != paNoError ) goto error;
printf("Repeating test %d times.\n", NUM_LOOPS );
for( i=0; i < NUM_LOOPS; ++i )
{
data.phase = 0;
data.generatedFramesCount = 0;
data.callbackReturnedPaComplete = 0;
data.callbackInvokedAfterReturningPaComplete = 0;
sprintf( data.message, "Loop: %d", i );
err = Pa_StartStream( stream );
if( err != paNoError ) goto error;
printf("Play for %d seconds.\n", NUM_SECONDS );
/* wait for the callback to complete generating NUM_SECONDS of tone */
do
{
Pa_Sleep( 500 );
}
while( !data.callbackReturnedPaComplete );
printf( "Callback returned paComplete.\n" );
printf( "Waiting for buffers to finish playing...\n" );
/* wait for stream to become inactive,
or for a timeout of approximately NUM_SECONDS
*/
j = 0;
while( (err = Pa_IsStreamActive( stream )) == 1 && j < NUM_SECONDS * 2 )
{
printf(".\n" );
Pa_Sleep( 500 );
++j;
}
if( err < 0 )
{
goto error;
}
else if( err == 1 )
{
printf( "TEST FAILED: Timed out waiting for buffers to finish playing.\n" );
}
else
{
printf("Buffers finished.\n" );
}
if( data.callbackInvokedAfterReturningPaComplete )
{
printf( "TEST FAILED: Callback was invoked after returning paComplete.\n" );
}
err = Pa_StopStream( stream );
if( err != paNoError ) goto error;
printf( "sleeping for 1 second...\n" );
Pa_Sleep( 1000 );
}
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;
}