C-实时音频加密和使用portaudio播放吗？

问题描述

我正在尝试进行实时音频加密和解密。我想从一个麦克风的麦克风记录段中一个接一个地捕获音频，应用我自己的加密算法，然后将其直接输出到扬声器或耳机。从我的研究中，我最终得到了portaudio库，该库接缝效率很高，但是我缺乏处理它的专业知识。 谁能给我一些关于如何进行我的项目的线索？ 请注意，我尝试在循环中使用单个开放流，将输出和输入同时使用，但是采样时遇到问题，最终出现了断断续续的声音。这是我的代码，任何人都可以纠正我或给我替代方法，也许可以使用回调函数??

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

/* #define SAMPLE_RATE  (17932) // Test failure to open with this value. */
#define SAMPLE_RATE  (44100)
#define FRAMES_PER_BUFFER (128)
#define NUM_SECONDS     (1)
#define NUM_CHANNELS    (2)
/* #define DITHER_FLAG     (paDitherOff)  */
#define DITHER_FLAG     (0) /**/

#define WRITE_TO_WAVE_FILE  (1)

/* Select sample format. */
#if 1
#define PA_SAMPLE_TYPE  paFloat32
typedef float SAMPLE;
#define SAMPLE_SILENCE  (0.0f)
#define PRINTF_S_FORMAT "%.8f"
#elif 1
#define PA_SAMPLE_TYPE  paInt16
typedef short SAMPLE;
#define SAMPLE_SILENCE  (0)
#define PRINTF_S_FORMAT "%d"
#elif 0
#define PA_SAMPLE_TYPE  paInt8
typedef char SAMPLE;
#define SAMPLE_SILENCE  (0)
#define PRINTF_S_FORMAT "%d"
#else
#define PA_SAMPLE_TYPE  paUInt8
typedef unsigned char SAMPLE;
#define SAMPLE_SILENCE  (128)
#define PRINTF_S_FORMAT "%d"
#endif

/*******************************************************************/
int main(void);
int main(void)
{
    PaStreamParameters inputParameters,outputParameters;
    PaStream *stream;
    PaError err;
    SAMPLE *recordedSamples;
    int i;
    int totalFrames;
    int numSamples;
    int numBytes;
    SAMPLE max,average,val;
    
    
    printf("patest_read_record.c\n"); fflush(stdout);

    totalFrames = NUM_SECONDS * SAMPLE_RATE; /* Record for a few seconds. */
    numSamples = totalFrames * NUM_CHANNELS;

    numBytes = numSamples * sizeof(SAMPLE);
    printf("\n");
    printf("%d",numBytes);
    printf("\n");
    
    recordedSamples = (SAMPLE *) malloc( numBytes );
    if( recordedSamples == NULL )
    {
        printf("Could not allocate record array.\n");
        exit(1);
    }
    for( i=0; i<numSamples; i++ ) recordedSamples[i] = 0;

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

    inputParameters.device = Pa_GetDefaultInputDevice(); /* default input device */
    if (inputParameters.device == paNoDevice) {
      fprintf(stderr,"Error: No default input device.\n");
      goto error;
    }
    inputParameters.channelCount = NUM_CHANNELS;
    inputParameters.sampleFormat = PA_SAMPLE_TYPE;
    inputParameters.suggestedLatency = Pa_GetDeviceInfo( inputParameters.device )->defaultLowInputLatency;
    inputParameters.hostApiSpecificStreamInfo = NULL;
     outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */
    if (outputParameters.device == paNoDevice) {
      fprintf(stderr,"Error: No default output device.\n");
      goto error;
    }
    outputParameters.channelCount = NUM_CHANNELS;
    outputParameters.sampleFormat =  PA_SAMPLE_TYPE;
    outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
    outputParameters.hostApiSpecificStreamInfo = NULL;

    /* Record some audio. -------------------------------------------- */
    
    
    while (1){
        printf("\n");
    printf("%d",numBytes);
    printf("\n");
    
    err = Pa_OpenStream(
              &stream,&inputParameters,&outputParameters,/* &outputParameters,*/
              SAMPLE_RATE,FRAMES_PER_BUFFER,paClipOff,/* we won't output out of range samples so don't bother clipping them */
              NULL,/* no callback,use blocking API */
              NULL ); /* no callback,so no callback userData */
    if( err != paNoError ) goto error;

    err = Pa_StartStream( stream );
    if( err != paNoError ) goto error;
    printf("Now recording!!\n"); fflush(stdout);

    err = Pa_ReadStream( stream,recordedSamples,totalFrames );
    if( err != paNoError ) goto error;
    err = Pa_WriteStream( stream,totalFrames );
        if( err != paNoError ) goto error;

    err = Pa_CloseStream( stream );
    if( err != paNoError ) goto error;

解决方法

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