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+/** @file patest_stop.c
+ @ingroup test_src
+ @brief Test different ways of stopping audio.
+
+ Test the three ways of stopping audio:
+ - calling Pa_StopStream(),
+ - calling Pa_AbortStream(),
+ - and returning a 1 from the callback function.
+
+ A long latency is set up so that you can hear the difference.
+ Then a simple 8 note sequence is repeated twice.
+ The program will print what you should hear.
+
+ @author Phil Burk <philburk@softsynth.com>
+*/
+/*
+ * $Id$
+ *
+ * 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.
+ *
+ * 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.
+ */
+
+/*
+ * The text above constitutes the entire PortAudio license; however,
+ * the PortAudio community also makes the following non-binding requests:
+ *
+ * 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. It is also
+ * requested that these non-binding requests be included along with the
+ * license above.
+ */
+#include <stdio.h>
+#include <math.h>
+#include "portaudio.h"
+
+#define OUTPUT_DEVICE (Pa_GetDefaultOutputDevice())
+#define SLEEP_DUR (200)
+#define SAMPLE_RATE (44100)
+#define FRAMES_PER_BUFFER (256)
+#define LATENCY_SECONDS (3.f)
+#define FRAMES_PER_NOTE (SAMPLE_RATE/2)
+#define MAX_REPEATS (2)
+#define FUNDAMENTAL (400.0f / SAMPLE_RATE)
+#define NOTE_0 (FUNDAMENTAL * 1.0f / 1.0f)
+#define NOTE_1 (FUNDAMENTAL * 5.0f / 4.0f)
+#define NOTE_2 (FUNDAMENTAL * 4.0f / 3.0f)
+#define NOTE_3 (FUNDAMENTAL * 3.0f / 2.0f)
+#define NOTE_4 (FUNDAMENTAL * 2.0f / 1.0f)
+#define MODE_FINISH (0)
+#define MODE_STOP (1)
+#define MODE_ABORT (2)
+#ifndef M_PI
+#define M_PI (3.14159265)
+#endif
+#define TABLE_SIZE (400)
+
+typedef struct
+{
+ float waveform[TABLE_SIZE + 1]; /* Add one for guard point for interpolation. */
+ float phase_increment;
+ float phase;
+ float *tune;
+ int notesPerTune;
+ int frameCounter;
+ int noteCounter;
+ int repeatCounter;
+ PaTime outTime;
+ int stopMode;
+ int done;
+}
+paTestData;
+
+/************* Prototypes *****************************/
+int TestStopMode( paTestData *data );
+float LookupWaveform( paTestData *data, float phase );
+
+/******************************************************
+ * Convert phase between 0.0 and 1.0 to waveform value
+ * using linear interpolation.
+ */
+float LookupWaveform( paTestData *data, float phase )
+{
+ float fIndex = phase*TABLE_SIZE;
+ int index = (int) fIndex;
+ float fract = fIndex - index;
+ float lo = data->waveform[index];
+ float hi = data->waveform[index+1];
+ float val = lo + fract*(hi-lo);
+ return val;
+}
+
+/* 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( const void *inputBuffer, void *outputBuffer,
+ unsigned long framesPerBuffer,
+ const PaStreamCallbackTimeInfo* timeInfo,
+ PaStreamCallbackFlags statusFlags,
+ void *userData )
+{
+ paTestData *data = (paTestData*)userData;
+ float *out = (float*)outputBuffer;
+ float value;
+ unsigned int i = 0;
+ int finished = paContinue;
+
+ (void) inputBuffer; /* Prevent unused variable warnings. */
+ (void) timeInfo;
+ (void) statusFlags;
+
+
+ /* data->outTime = outTime; */
+
+ if( !data->done )
+ {
+ for( i=0; i<framesPerBuffer; i++ )
+ {
+ /* Are we done with this note? */
+ if( data->frameCounter >= FRAMES_PER_NOTE )
+ {
+ data->noteCounter += 1;
+ data->frameCounter = 0;
+ /* Are we done with this tune? */
+ if( data->noteCounter >= data->notesPerTune )
+ {
+ data->noteCounter = 0;
+ data->repeatCounter += 1;
+ /* Are we totally done? */
+ if( data->repeatCounter >= MAX_REPEATS )
+ {
+ data->done = 1;
+ if( data->stopMode == MODE_FINISH )
+ {
+ finished = paComplete;
+ break;
+ }
+ }
+ }
+ data->phase_increment = data->tune[data->noteCounter];
+ }
+ value = LookupWaveform(data, data->phase);
+ *out++ = value; /* left */
+ *out++ = value; /* right */
+ data->phase += data->phase_increment;
+ if( data->phase >= 1.0f ) data->phase -= 1.0f;
+
+ data->frameCounter += 1;
+ }
+ }
+ /* zero remainder of final buffer */
+ for( ; i<framesPerBuffer; i++ )
+ {
+ *out++ = 0; /* left */
+ *out++ = 0; /* right */
+ }
+ return finished;
+}
+/*******************************************************************/
+int main(void);
+int main(void)
+{
+ paTestData data;
+ int i;
+ float simpleTune[] = { NOTE_0, NOTE_1, NOTE_2, NOTE_3, NOTE_4, NOTE_3, NOTE_2, NOTE_1 };
+
+ printf("PortAudio Test: play song and test stopping. ask for %f seconds latency\n", LATENCY_SECONDS );
+ /* initialise sinusoidal wavetable */
+ for( i=0; i<TABLE_SIZE; i++ )
+ {
+ data.waveform[i] = (float) (
+ (0.2 * sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. )) +
+ (0.2 * sin( ((double)(3*i)/(double)TABLE_SIZE) * M_PI * 2. )) +
+ (0.1 * sin( ((double)(5*i)/(double)TABLE_SIZE) * M_PI * 2. ))
+ );
+ }
+ data.waveform[TABLE_SIZE] = data.waveform[0]; /* Set guard point. */
+ data.tune = &simpleTune[0];
+ data.notesPerTune = sizeof(simpleTune) / sizeof(float);
+
+ printf("Test MODE_FINISH - callback returns 1.\n");
+ printf("Should hear entire %d note tune repeated twice.\n", data.notesPerTune);
+ data.stopMode = MODE_FINISH;
+ if( TestStopMode( &data ) != paNoError )
+ {
+ printf("Test of MODE_FINISH failed!\n");
+ goto error;
+ }
+
+ printf("Test MODE_STOP - stop when song is done.\n");
+ printf("Should hear entire %d note tune repeated twice.\n", data.notesPerTune);
+ data.stopMode = MODE_STOP;
+ if( TestStopMode( &data ) != paNoError )
+ {
+ printf("Test of MODE_STOP failed!\n");
+ goto error;
+ }
+
+ printf("Test MODE_ABORT - abort immediately.\n");
+ printf("Should hear last repetition cut short by %f seconds.\n", LATENCY_SECONDS);
+ data.stopMode = MODE_ABORT;
+ if( TestStopMode( &data ) != paNoError )
+ {
+ printf("Test of MODE_ABORT failed!\n");
+ goto error;
+ }
+
+ return 0;
+
+error:
+ return 1;
+}
+
+int TestStopMode( paTestData *data )
+{
+ PaStreamParameters outputParameters;
+ PaStream *stream;
+ PaError err;
+
+ data->done = 0;
+ data->phase = 0.0;
+ data->frameCounter = 0;
+ data->noteCounter = 0;
+ data->repeatCounter = 0;
+ data->phase_increment = data->tune[data->noteCounter];
+
+ err = Pa_Initialize();
+ if( err != paNoError ) goto error;
+
+ outputParameters.device = OUTPUT_DEVICE;
+ 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 = LATENCY_SECONDS;
+ outputParameters.hostApiSpecificStreamInfo = NULL;
+
+ err = Pa_OpenStream(
+ &stream,
+ NULL, /* no input */
+ &outputParameters,
+ 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;
+
+ err = Pa_StartStream( stream );
+ if( err != paNoError ) goto error;
+
+ if( data->stopMode == MODE_FINISH )
+ {
+ while( ( err = Pa_IsStreamActive( stream ) ) == 1 )
+ {
+ /*printf("outTime = %g, note# = %d, repeat# = %d\n", data->outTime,
+ data->noteCounter, data->repeatCounter );
+ fflush(stdout); */
+ Pa_Sleep( SLEEP_DUR );
+ }
+ if( err < 0 ) goto error;
+ }
+ else
+ {
+ while( data->repeatCounter < MAX_REPEATS )
+ {
+ /*printf("outTime = %g, note# = %d, repeat# = %d\n", data->outTime,
+ data->noteCounter, data->repeatCounter );
+ fflush(stdout); */
+ Pa_Sleep( SLEEP_DUR );
+ }
+ }
+
+ if( data->stopMode == MODE_ABORT )
+ {
+ printf("Call Pa_AbortStream()\n");
+ err = Pa_AbortStream( stream );
+ }
+ else
+ {
+ printf("Call Pa_StopStream()\n");
+ err = Pa_StopStream( stream );
+ }
+ if( err != paNoError ) goto error;
+
+ printf("Call Pa_CloseStream()\n"); fflush(stdout);
+ err = Pa_CloseStream( stream );
+ if( err != paNoError ) goto error;
+
+ Pa_Terminate();
+ printf("Test finished.\n");
+
+ return err;
+
+error:
+ Pa_Terminate();
+ fprintf( stderr, "An error occurred while using the portaudio stream\n" );
+ fprintf( stderr, "Error number: %d\n", err );
+ fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
+ return err;
+}