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steadily play a different sine wave on each channel

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philburk 2002-03-19 01:30:28 +00:00
commit ac7b7bb96a
1 changed files with 40 additions and 62 deletions
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102
pa_tests/debug_multi_out.c
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@ -1,9 +1,8 @@
/*
* $Id$
* debug_multi.c
* Play a sine wave on each of multiple channels,
* debug_multi_out.c
* Play a different sine wave on each channels,
* using the Portable Audio api.
* Hacked test for debugging PA.
*
* Author: Phil Burk http://www.softsynth.com
*
@ -38,28 +37,24 @@
#include <stdio.h>
#include <math.h>
#include "portaudio.h"
#define NUM_CHANNELS (8)
// #define OUTPUT_DEVICE (Pa_GetDefaultOutputDeviceID())
#define OUTPUT_DEVICE (18)
#define NUM_SECONDS (NUM_CHANNELS*4)
#define OUTPUT_DEVICE (Pa_GetDefaultOutputDeviceID())
#define SAMPLE_RATE (44100)
#define FRAMES_PER_CHANNEL (SAMPLE_RATE/2)
#define FRAMES_PER_BUFFER (256)
#define MIN_LATENCY_MSEC (400)
#define NUM_BUFFERS ((MIN_LATENCY_MSEC * SAMPLE_RATE) / (FRAMES_PER_BUFFER * 1000))
#define FREQ_INCR (300.0 / SAMPLE_RATE)
#define MAX_CHANNELS (64)
#ifndef M_PI
#define M_PI (3.14159265)
#endif
#define TABLE_SIZE (800)
typedef struct
{
float sine[TABLE_SIZE];
int phase;
int liveChannel;
int count;
unsigned int sampsToGo;
int numChannels;
double phases[MAX_CHANNELS];
}
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().
@ -70,38 +65,25 @@ static int patestCallback( void *inputBuffer, void *outputBuffer,
{
paTestData *data = (paTestData*)userData;
float *out = (float*)outputBuffer;
int i, j;
int frameIndex, channelIndex;
int finished = 0;
(void) outTime; /* Prevent unused variable warnings. */
(void) inputBuffer;
if( data->sampsToGo < framesPerBuffer )
for( frameIndex=0; frameIndex<(int)framesPerBuffer; frameIndex++ )
{
finished = 1;
}
else
{
for( i=0; i<(int)framesPerBuffer; i++ )
for( channelIndex=0; channelIndex<data->numChannels; channelIndex++ )
{
for( j=0; j<NUM_CHANNELS; j++ )
{
/* Output sine wave only on live channel. */
*out++ = (j==data->liveChannel) ? data->sine[data->phase] : 0.0f;
/* Play each channel at a higher frequency. */
data->phase += 1 + data->liveChannel;
if( data->phase >= TABLE_SIZE ) data->phase -= TABLE_SIZE;
}
/* Switch channels every so often. */
if( --data->count <= 0 )
{
data->count = FRAMES_PER_CHANNEL;
data->liveChannel += 1;
if( data->liveChannel >= NUM_CHANNELS ) data->liveChannel = 0;
}
/* Output sine wave on every channel. */
*out++ = (float) sin(data->phases[channelIndex]);
/* Play each channel at a higher frequency. */
data->phases[channelIndex] += FREQ_INCR * (4 + channelIndex);
if( data->phases[channelIndex] >= (2.0 * M_PI) ) data->phases[channelIndex] -= (2.0 * M_PI);
}
data->sampsToGo -= framesPerBuffer;
}
return finished;
return 0;
}
/*******************************************************************/
int main(void);
@ -109,21 +91,18 @@ int main(void)
{
PortAudioStream *stream;
PaError err;
paTestData data;
int i;
int totalSamps;
printf("PortAudio Test: output sine wave. %d buffers\n", NUM_BUFFERS );
/* initialise sinusoidal wavetable */
for( i=0; i<TABLE_SIZE; i++ )
{
data.sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. );
}
data.phase = 0;
data.count = FRAMES_PER_CHANNEL;
data.liveChannel = 0;
data.sampsToGo = totalSamps = NUM_SECONDS * SAMPLE_RATE; /* Play for a few seconds. */
const PaDeviceInfo *pdi;
paTestData data = {0};
printf("PortAudio Test: output sine wave on each channel.\n" );
err = Pa_Initialize();
if( err != paNoError ) goto error;
pdi = Pa_GetDeviceInfo( OUTPUT_DEVICE );
data.numChannels = pdi->maxOutputChannels;
if( data.numChannels > MAX_CHANNELS ) data.numChannels = MAX_CHANNELS;
printf("Number of Channels = %d\n", data.numChannels );
err = Pa_OpenStream(
&stream,
paNoDevice, /* default input device */
@ -131,27 +110,26 @@ int main(void)
paFloat32, /* 32 bit floating point input */
NULL,
OUTPUT_DEVICE,
NUM_CHANNELS,
data.numChannels,
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 */
0, /* 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;
err = Pa_StartStream( stream );
if( err != paNoError ) goto error;
printf("Is callback being called?\n");
for( i=0; i<NUM_SECONDS; i++ )
{
printf("data.sampsToGo = %d\n", data.sampsToGo );
Pa_Sleep( 1000 );
}
/* Stop sound until ENTER hit. */
printf("Hit ENTER to stop sound.\n");
getchar();
err = Pa_StopStream( stream );
if( err != paNoError ) goto error;
Pa_CloseStream( stream );
Pa_Terminate();
printf("Test finished.\n");