portaudio/test/patest_sine_srate.c

/*
 * $Id: patest_sine.c 1097 2006-08-26 08:27:53Z rossb $
 *
 * 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.
 */

/** @file patest_sine_srate_mac.c
    @ingroup test_src
    @brief Plays sine waves at 44100 and 48000,
          and forces the hardware to change if this is a mac.
          Designed for use with CoreAudio.
    @author Bjorn Roche <bjorn@xowave.com>
   @author Ross Bencina <rossb@audiomulch.com>
   @author Phil Burk <philburk@softsynth.com>
*/

#include <stdio.h>
#include <math.h>
#include "portaudio.h"

#ifdef __APPLE__
#include "pa_mac_core.h"
#endif

#define NUM_SECONDS   (5)
#define SAMPLE_RATE1   (44100)
#define SAMPLE_RATE2   (48000)
#define FRAMES_PER_BUFFER  (64)

#ifndef M_PI
#define M_PI  (3.14159265)
#endif

#define TABLE_SIZE   (200)
typedef struct
{
    float sine[TABLE_SIZE];
    int left_phase;
    int right_phase;
}
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().
*/
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;
    unsigned long i;

    (void) timeInfo; /* Prevent unused variable warnings. */
    (void) statusFlags;
    (void) inputBuffer;

    for( i=0; i<framesPerBuffer; i++ )
    {
        *out++ = data->sine[data->left_phase];  /* left */
        *out++ = data->sine[data->right_phase];  /* right */
        data->left_phase += 1;
        if( data->left_phase >= TABLE_SIZE ) data->left_phase -= TABLE_SIZE;
        data->right_phase += 3; /* higher pitch so we can distinguish left and right. */
        if( data->right_phase >= TABLE_SIZE ) data->right_phase -= TABLE_SIZE;
    }

    return paContinue;
}

/*******************************************************************/
int main(void);
int main(void)
{
    PaStreamParameters outputParameters;
    PaStream *stream;
    PaError err;
    paTestData data;
#ifdef __APPLE__
    PaMacCoreStreamInfo macInfo;
#endif
    int i;

    /* 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;

    err = Pa_Initialize();
    if( err != paNoError ) goto error;

    for( i=0; i<2; ++i ) {
        const float sr = i ? SAMPLE_RATE2 : SAMPLE_RATE1;
        printf("PortAudio Test: output sine wave. SR = %g, BufSize = %d\n", sr, FRAMES_PER_BUFFER);
        outputParameters.device = Pa_GetDefaultOutputDevice(); /* default 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 = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
        /** setup host specific info */
#ifdef __APPLE__
        PaMacCore_SetupStreamInfo( &macInfo, paMacCorePro );
        outputParameters.hostApiSpecificStreamInfo = &macInfo;
#else
        printf( "Hardware SR changing not being tested on this platform.\n" );
        outputParameters.hostApiSpecificStreamInfo = NULL;
#endif
        err = Pa_OpenStream(
                &stream,
                NULL, /* no input */
                &outputParameters,
                sr,
                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;

        printf("Play for %d seconds.\n", NUM_SECONDS );
        Pa_Sleep( NUM_SECONDS * 1000 );

        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 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;
}