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svn path=/trunk/; revision=1302

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diff --git a/pd/portaudio_v18/pa_tests/patest_sync.c b/pd/portaudio_v18/pa_tests/patest_sync.c
new file mode 100644
index 00000000..c70fbb35
--- /dev/null
+++ b/pd/portaudio_v18/pa_tests/patest_sync.c
@@ -0,0 +1,227 @@
+/*
+ * $Id: patest_sync.c,v 1.1.1.1 2002/01/22 00:52:40 phil Exp $
+ * patest_sync.c
+ * Test time stamping and synchronization of audio and video.
+ * A high latency is used so we can hear the difference in time.
+ * Random durations are used so we know we are hearing the right beep
+ * and not the one before or after.
+ *
+ * Sequence of events:
+ *    Foreground requests a beep.
+ *    Background randomly schedules a beep.
+ *    Foreground waits for the beep to be heard based on Pa_StreamTime().
+ *    Foreground outputs video (printf) in sync with audio.
+ *    Repeat.
+ *
+ * Author: Phil Burk  http://www.softsynth.com
+ *
+ * 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.
+ *
+ * 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 <stdio.h>
+#include <math.h>
+#include "portaudio.h"
+#define NUM_BEEPS           (6)
+#define SAMPLE_RATE         (44100)
+#define FRAMES_PER_BUFFER   (256)
+#define BEEP_DURATION       (1000)
+#define LATENCY_MSEC        (2000)
+#define SLEEP_MSEC          (10)
+#define TIMEOUT_MSEC        ((3 * LATENCY_MSEC) / (2 * SLEEP_MSEC))
+#define NUM_BUFFERS         ((LATENCY_MSEC * SAMPLE_RATE) / (FRAMES_PER_BUFFER * 1000))
+#define STATE_BKG_IDLE    (0)
+#define STATE_BKG_PENDING (1)
+#define STATE_BKG_BEEPING (2)
+typedef struct
+{
+    float        left_phase;
+    float        right_phase;
+    int          state;
+    int          requestBeep;  /* Set by foreground, cleared by background. */
+    PaTimestamp  beepTime;
+    int          beepCount;
+}
+paTestData;
+static unsigned long GenerateRandomNumber( void );
+/************************************************************/
+/* Calculate pseudo-random 32 bit number based on linear congruential method. */
+static unsigned long GenerateRandomNumber( void )
+{
+    static unsigned long randSeed = 22222;  /* Change this for different random sequences. */
+    randSeed = (randSeed * 196314165) + 907633515;
+    return randSeed;
+}
+/* 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 )
+{
+    /* Cast data passed through stream to our structure. */
+    paTestData *data = (paTestData*)userData;
+    float *out = (float*)outputBuffer;
+    unsigned int i;
+    (void) inputBuffer;
+
+    for( i=0; i<framesPerBuffer; i++ )
+    {
+        switch( data->state )
+        {
+        case STATE_BKG_IDLE:
+            /* Schedule beep at some random time in the future. */
+            if( data->requestBeep )
+            {
+                int random = GenerateRandomNumber() >> 14;
+                data->beepTime = outTime + (i + random + (SAMPLE_RATE/4));
+                data->state = STATE_BKG_PENDING;
+                data->requestBeep = 0;
+                data->left_phase = data->right_phase = 0.0;
+            }
+            *out++ = 0.0;  /* left */
+            *out++ = 0.0;  /* right */
+            break;
+        case STATE_BKG_PENDING:
+            if( (outTime + i) >= data->beepTime )
+            {
+                data->state = STATE_BKG_BEEPING;
+                data->beepCount = BEEP_DURATION;
+            }
+            *out++ = 0.0;  /* left */
+            *out++ = 0.0;  /* right */
+            break;
+        case STATE_BKG_BEEPING:
+            if( data->beepCount <= 0 )
+            {
+                data->state = STATE_BKG_IDLE;
+                *out++ = 0.0;  /* left */
+                *out++ = 0.0;  /* right */
+            }
+            else
+            {
+                /* Play sawtooth wave. */
+                *out++ = data->left_phase;  /* left */
+                *out++ = data->right_phase;  /* right */
+                /* Generate simple sawtooth phaser that ranges between -1.0 and 1.0. */
+                data->left_phase += 0.01f;
+                /* When signal reaches top, drop back down. */
+                if( data->left_phase >= 1.0f ) data->left_phase -= 2.0f;
+                /* higher pitch so we can distinguish left and right. */
+                data->right_phase += 0.03f;
+                if( data->right_phase >= 1.0f ) data->right_phase -= 2.0f;
+            }
+            data->beepCount -= 1;
+            break;
+        default:
+            data->state = STATE_BKG_IDLE;
+            break;
+        }
+    }
+    return 0;
+}
+/*******************************************************************/
+int main(void);
+int main(void)
+{
+    PortAudioStream *stream;
+    PaError    err;
+    paTestData DATA;
+    int        i, timeout;
+    PaTimestamp  previousTime;
+    printf("PortAudio Test: you should see BEEP at the same time you hear it.\n");
+    printf("Wait for a few seconds random delay between BEEPs.\n");
+    printf("BEEP %d times.\n", NUM_BEEPS );
+    /* Initialize our DATA for use by callback. */
+    DATA.left_phase = DATA.right_phase = 0.0;
+    DATA.state = STATE_BKG_IDLE;
+    DATA.requestBeep = 0;
+    /* Initialize library before making any other calls. */
+    err = Pa_Initialize();
+    if( err != paNoError ) goto error;
+    /* Open an audio I/O stream. */
+    err = Pa_OpenDefaultStream(
+              &stream,
+              0,              /* no input channels */
+              2,              /* stereo output */
+              paFloat32,      /* 32 bit floating point output */
+              SAMPLE_RATE,
+              FRAMES_PER_BUFFER,
+              NUM_BUFFERS,
+              patestCallback,
+              &DATA );
+    if( err != paNoError ) goto error;
+    err = Pa_StartStream( stream );
+    if( err != paNoError ) goto error;
+    previousTime = Pa_StreamTime( stream );
+    for( i=0; i<NUM_BEEPS; i++ )
+    {
+        /* Request a beep from background. */
+        DATA.requestBeep = 1;
+        /* Wait for background to acknowledge request. */
+        timeout = TIMEOUT_MSEC;
+        while( (DATA.requestBeep == 1) && (timeout-- > 0 ) ) Pa_Sleep(SLEEP_MSEC);
+        if( timeout <= 0 )
+        {
+            fprintf( stderr, "Timed out waiting for background to acknowledge request.\n" );
+            goto error;
+        }
+        /* Wait for scheduled beep time. */
+        timeout =  TIMEOUT_MSEC + (10000/SLEEP_MSEC);
+        while( (Pa_StreamTime( stream ) < DATA.beepTime) && (timeout-- > 0 ) )
+        {
+            Pa_Sleep(SLEEP_MSEC);
+        }
+        if( timeout <= 0 )
+        {
+            fprintf( stderr, "Timed out waiting for time. Now = %g, Beep for %g.\n",
+                     Pa_StreamTime( stream ), DATA.beepTime );
+            goto error;
+        }
+        /* Beep should be sounding now so print synchronized BEEP. */
+        printf("BEEP");
+        fflush(stdout);
+        printf(" at %d, delta = %d\n",
+               (long) DATA.beepTime, (long) (DATA.beepTime - previousTime) );
+        fflush(stdout);
+        previousTime = DATA.beepTime;
+    }
+    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;
+}