pa_devs.c

Audacity是一款用於錄音和編輯聲音的、免費的開放源碼軟體。它可以執行於Mac OS X、Microsoft Windows、GNU/Linux和其它作業系統

/** @file pa_devs.c
    @brief List available devices, including device information.
	@author Phil Burk http://www.softsynth.com

    @note Define PA_NO_ASIO to compile this code on Windows without
        ASIO support.
*/
/*
 * $Id: pa_devs.c,v 1.2 2004/04/22 04:19:51 mbrubeck Exp $
 *
 * 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"

#ifdef WIN32
#ifndef PA_NO_ASIO
#include "pa_asio.h"
#endif
#endif

/*******************************************************************/
static void PrintSupportedStandardSampleRates(
        const PaStreamParameters *inputParameters,
        const PaStreamParameters *outputParameters )
{
    static double standardSampleRates[] = {
        8000.0, 9600.0, 11025.0, 12000.0, 16000.0, 22050.0, 24000.0, 32000.0,
        44100.0, 48000.0, 88200.0, 96000.0, 192000.0, -1 /* negative terminated  list */
    };
    int     i, printCount;
    PaError err;

    printCount = 0;
    for( i=0; standardSampleRates[i] > 0; i++ )
    {
        err = Pa_IsFormatSupported( inputParameters, outputParameters, standardSampleRates[i] );
        if( err == paFormatIsSupported )
        {
            if( printCount == 0 )
            {
                printf( "\t%8.2f", standardSampleRates[i] );
                printCount = 1;
            }
            else if( printCount == 4 )
            {
                printf( ",\n\t%8.2f", standardSampleRates[i] );
                printCount = 1;
            }
            else
            {
                printf( ", %8.2f", standardSampleRates[i] );
                ++printCount;
            }
        }
    }
    if( !printCount )
        printf( "None\n" );
    else
        printf( "\n" );
}
/*******************************************************************/
int main(void);
int main(void)
{
    int     i, numDevices, defaultDisplayed;
    const   PaDeviceInfo *deviceInfo;
    PaStreamParameters inputParameters, outputParameters;
    PaError err;

    
    Pa_Initialize();

    printf( "PortAudio version number = %d\nPortAudio version text = '%s'\n",
            Pa_GetVersion(), Pa_GetVersionText() );

            
    numDevices = Pa_GetDeviceCount();
    if( numDevices < 0 )
    {
        printf( "ERROR: Pa_CountDevices returned 0x%x\n", numDevices );
        err = numDevices;
        goto error;
    }
    
    printf( "Number of devices = %d\n", numDevices );
    for( i=0; i<numDevices; i++ )
    {
        deviceInfo = Pa_GetDeviceInfo( i );
        printf( "--------------------------------------- device #%d\n", i );
                
    /* Mark global and API specific default devices */
        defaultDisplayed = 0;
        if( i == Pa_GetDefaultInputDevice() )
        {
            printf( "[ Default Input" );
            defaultDisplayed = 1;
        }
        else if( i == Pa_GetHostApiInfo( deviceInfo->hostApi )->defaultInputDevice )
        {
            const PaHostApiInfo *hostInfo = Pa_GetHostApiInfo( deviceInfo->hostApi );
            printf( "[ Default %s Input", hostInfo->name );
            defaultDisplayed = 1;
        }
        
        if( i == Pa_GetDefaultOutputDevice() )
        {
            printf( (defaultDisplayed ? "," : "[") );
            printf( " Default Output" );
            defaultDisplayed = 1;
        }
        else if( i == Pa_GetHostApiInfo( deviceInfo->hostApi )->defaultOutputDevice )
        {
            const PaHostApiInfo *hostInfo = Pa_GetHostApiInfo( deviceInfo->hostApi );
            printf( (defaultDisplayed ? "," : "[") );                
            printf( " Default %s Output", hostInfo->name );
            defaultDisplayed = 1;
        }

        if( defaultDisplayed )
            printf( " ]\n" );

    /* print device info fields */
        printf( "Name                        = %s\n", deviceInfo->name );
        printf( "Host API                    = %s\n",  Pa_GetHostApiInfo( deviceInfo->hostApi )->name );
        printf( "Max inputs = %d", deviceInfo->maxInputChannels  );
        printf( ", Max outputs = %d\n", deviceInfo->maxOutputChannels  );

        printf( "Default low input latency   = %8.3f\n", deviceInfo->defaultLowInputLatency  );
        printf( "Default low output latency  = %8.3f\n", deviceInfo->defaultLowOutputLatency  );
        printf( "Default high input latency  = %8.3f\n", deviceInfo->defaultHighInputLatency  );
        printf( "Default high output latency = %8.3f\n", deviceInfo->defaultHighOutputLatency  );

#ifdef WIN32
#ifndef PA_NO_ASIO
/* ASIO specific latency information */
        if( Pa_GetHostApiInfo( deviceInfo->hostApi )->type == paASIO ){
            long minLatency, maxLatency, preferredLatency, granularity;

            err = PaAsio_GetAvailableLatencyValues( i,
		            &minLatency, &maxLatency, &preferredLatency, &granularity );

            printf( "ASIO minimum buffer size    = %ld\n", minLatency  );
            printf( "ASIO maximum buffer size    = %ld\n", maxLatency  );
            printf( "ASIO preferred buffer size  = %ld\n", preferredLatency  );

            if( granularity == -1 )
                printf( "ASIO buffer granularity     = power of 2\n" );
            else
                printf( "ASIO buffer granularity     = %ld\n", granularity  );
        }
#endif /* !PA_NO_ASIO */
#endif /* WIN32 */

        printf( "Default sample rate         = %8.2f\n", deviceInfo->defaultSampleRate );

    /* poll for standard sample rates */
        inputParameters.device = i;
        inputParameters.channelCount = deviceInfo->maxInputChannels;
        inputParameters.sampleFormat = paInt16;
        inputParameters.suggestedLatency = 0; /* ignored by Pa_IsFormatSupported() */
        inputParameters.hostApiSpecificStreamInfo = NULL;
        
        outputParameters.device = i;
        outputParameters.channelCount = deviceInfo->maxOutputChannels;
        outputParameters.sampleFormat = paInt16;
        outputParameters.suggestedLatency = 0; /* ignored by Pa_IsFormatSupported() */
        outputParameters.hostApiSpecificStreamInfo = NULL;

        if( inputParameters.channelCount > 0 )
        {
            printf("Supported standard sample rates\n for half-duplex 16 bit %d channel input = \n",
                    inputParameters.channelCount );
            PrintSupportedStandardSampleRates( &inputParameters, NULL );
        }

        if( outputParameters.channelCount > 0 )
        {
            printf("Supported standard sample rates\n for half-duplex 16 bit %d channel output = \n",
                    outputParameters.channelCount );
            PrintSupportedStandardSampleRates( NULL, &outputParameters );
        }

        if( inputParameters.channelCount > 0 && outputParameters.channelCount > 0 )
        {
            printf("Supported standard sample rates\n for full-duplex 16 bit %d channel input, %d channel output = \n",
                    inputParameters.channelCount, outputParameters.channelCount );
            PrintSupportedStandardSampleRates( &inputParameters, &outputParameters );
        }
    }

    Pa_Terminate();

    printf("----------------------------------------------\n");
    return 0;

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;
}