PortAudio示例代码问题
PortAudio example code issue
我想制作一个吉他效果程序,所以我尝试从PORTAUDIO API运行示例代码pa_fuzz.c。
它在paWDMKS主机api上工作。但是,当我使用Behringer ucg 102连接吉他时(为了不方便),主机api变为paMME,我得到错误代码1和消息:"未定义的外部错误"。同样在visual studio输出控制台中,我收到了大量的消息,比如:
'ConsoleApplication4.exe' (Win32): Unloaded 'C:WindowsSysWOW64SHCore.dll'
'ConsoleApplication4.exe' (Win32): Unloaded 'C:WindowsSysWOW64shlwapi.dll'
'ConsoleApplication4.exe' (Win32): Unloaded 'C:WindowsSysWOW64shell32.dll'
'ConsoleApplication4.exe' (Win32): Unloaded 'C:WindowsSysWOW64dbgcore.dll'
'ConsoleApplication4.exe' (Win32): Unloaded 'C:Program FilesNative InstrumentsRig Kontrol 3 Driverasiorig3asio32.dll'
以下是"PaHostErrorInfo"对象的代码片段;
PaHostErrorInfo *err2 = Pa_GetLastHostErrorInfo();
printf(err2->errorText);
这是源代码:
#include <stdio.h>
#include <math.h>
#include "portaudio.h"
/*
** Note that many of the older ISA sound cards on PCs do NOT support
** full duplex audio (simultaneous record and playback).
** And some only support full duplex at lower sample rates.
*/
#define SAMPLE_RATE (8000)
#define PA_SAMPLE_TYPE paFloat32
#define FRAMES_PER_BUFFER (64)
typedef float SAMPLE;
float CubicAmplifier( float input );
static int fuzzCallback( const void *inputBuffer, void *outputBuffer,
unsigned long framesPerBuffer,
const PaStreamCallbackTimeInfo* timeInfo,
PaStreamCallbackFlags statusFlags,
void *userData );
/* Non-linear amplifier with soft distortion curve. */
float CubicAmplifier( float input )
{
float output, temp;
if( input < 0.0 )
{
temp = input + 1.0f;
output = (temp * temp * temp) - 1.0f;
}
else
{
temp = input - 1.0f;
output = (temp * temp * temp) + 1.0f;
}
return output;
}
#define FUZZ(x) CubicAmplifier(CubicAmplifier(CubicAmplifier(CubicAmplifier(x))))
static int gNumNoInputs = 0;
/* This routine will be called by the PortAudio engine when audio is needed.
** It may be 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 fuzzCallback( const void *inputBuffer, void *outputBuffer,
unsigned long framesPerBuffer,
const PaStreamCallbackTimeInfo* timeInfo,
PaStreamCallbackFlags statusFlags,
void *userData )
{
SAMPLE *out = (SAMPLE*)outputBuffer;
const SAMPLE *in = (const SAMPLE*)inputBuffer;
unsigned int i;
(void) timeInfo; /* Prevent unused variable warnings. */
(void) statusFlags;
(void) userData;
if( inputBuffer == NULL )
{
for( i=0; i<framesPerBuffer; i++ )
{
*out++ = 0; /* left - silent */
*out++ = 0; /* right - silent */
}
gNumNoInputs += 1;
}
else
{
for( i=0; i<framesPerBuffer; i++ )
{
*out++ = FUZZ(*in++); /* left - distorted */
*out++ = *in++; /* right - clean */
}
}
return paContinue;
}
/*******************************************************************/
int main(void);
int main(void)
{
PaStreamParameters inputParameters, outputParameters;
PaStream *stream;
PaError err;
PaDeviceInfo *info;
err = Pa_Initialize();
if( err != paNoError ) goto error;
info = Pa_GetDeviceInfo(1);
inputParameters.device = Pa_GetDefaultInputDevice(); /* default input device */
if (inputParameters.device == paNoDevice) {
fprintf(stderr,"Error: No default input device.n");
goto error;
}
inputParameters.channelCount = 2; /* stereo input */
inputParameters.sampleFormat = PA_SAMPLE_TYPE;
inputParameters.suggestedLatency = Pa_GetDeviceInfo( inputParameters.device )->defaultLowInputLatency;
inputParameters.hostApiSpecificStreamInfo = NULL;
info = Pa_GetDeviceInfo(4);
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 = PA_SAMPLE_TYPE;
outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
outputParameters.hostApiSpecificStreamInfo = NULL;
err = Pa_OpenStream(
&stream,
&inputParameters,
&outputParameters,
SAMPLE_RATE,
FRAMES_PER_BUFFER,
0, /* paClipOff, */ /* we won't output out of range samples so don't bother clipping them */
fuzzCallback,
NULL );
PaHostErrorInfo *err2 = Pa_GetLastHostErrorInfo();
printf(err2->errorText);
if( err != paNoError ) goto error;
err = Pa_StartStream( stream );
if( err != paNoError ) goto error;
printf("Hit ENTER to stop program.n");
getchar();
err = Pa_CloseStream( stream );
if( err != paNoError ) goto error;
printf("Finished. gNumNoInputs = %dn", gNumNoInputs );
Pa_Terminate();
return 0;
error:
Pa_Terminate();
fprintf( stderr, "An error occured while using the portaudio streamn" );
fprintf( stderr, "Error number: %dn", err );
fprintf( stderr, "Error message: %sn", Pa_GetErrorText( err ) );
return -1;
}
你们能看看有什么问题吗?我已经安装了BERINGER USB WDM AUDIO 2.8.40驱动程序。(我把这个usb接口和吉他装备一起使用)
我切换到另一个usb端口,它工作了。我想这是portaudio的一个bug。我将把这个答案留在这里。现在我有另一个问题。LATENCY:(弹吉他有延迟真是令人沮丧。造成这种延迟的原因是什么?我正在把我的吉他和behringer ucg102(以无延迟著称)连接起来。再说一遍,我把它和GuitarRig一起使用,在那里我有接近0的延迟。这是portaudio图书馆的问题吗?此代码来自他们的示例"pa_fuzz.c"
新编辑:通过选择所需的输入和输出设备修复了延迟问题。
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