内存问题连续录制音频

在这里,我正在为一个连续录音音频系统编写一些代码.然后,当某个幅度阈值被破坏时,我尝试将音频录制一段时间.

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include <time.h>
#include <portaudio.h>
#include <sndfile.h>

#define FRAMES_PER_BUFFER (1024)
#define SAMPLE_SIZE (4)

typedef struct
{
    uint16_t formatType;
    uint16_t numberOfChannels;
    uint32_t sampleRate;
    float* recordedSamples;
} AudioData;

AudioData initAudioData(uint32_t sampleRate,uint16_t channels,int type)
{
    AudioData data;
    data.formatType = type;
    data.numberOfChannels = channels;
    data.sampleRate = sampleRate;
    return data;
}

float avg(float *data)
{
    int elems = sizeof(data) / sizeof(data[0]);
    float sum = 0;
    for (int i = 0; i < elems; i++)
    {
        sum += fabs(*(data + i));
    }
    return (float) sum / elems;
}

int main(void)
{
    AudioData data = initAudioData(44100,2,paFloat32);
    PaStream *stream = NULL;
    PaError err = paNoError;
    int size = FRAMES_PER_BUFFER * data.numberOfChannels * SAMPLE_SIZE;
    float *sampleBlock = malloc(size);
    float *recordedSamples = NULL;
    time_t talking = 0;
    time_t silence = 0;

    if((err = Pa_Initialize())) goto done;
    PaStreamParameters inputParameters =
    {
        .device = Pa_GetDefaultInputDevice(),.channelCount = data.numberOfChannels,.sampleFormat = data.formatType,.suggestedLatency = Pa_GetDeviceInfo(Pa_GetDefaultInputDevice())->defaultHighInputLatency,.hostApiSpecificStreamInfo = NULL
    };
    if((err = Pa_OpenStream(&stream,&inputParameters,NULL,data.sampleRate,FRAMES_PER_BUFFER,paClipOff,NULL))) goto done;
    if((err = Pa_StartStream(stream))) goto done;
    for(int i = 0;;)
    {
        err = Pa_ReadStream(stream,sampleBlock,FRAMES_PER_BUFFER);
        if(avg(sampleBlock) > 0.000550) // talking
        {
            printf("You're talking! %d\n",i);
            i++;
            time(&talking);
            recordedSamples = realloc(recordedSamples,size * i);
            if (recordedSamples) memcpy(recordedSamples + ((i - 1) * size),size); // problem here writing to memory at i = 16?
            else free(recordedSamples);
        }
        else //silence
        {
            double test = difftime(time(&silence),talking);
            printf("Time diff: %g\n",test);
            if (test >= 1.5)
            {
                // TODO: finish code processing audio snippet
                talking = 0;
                free(recordedSamples); // problem freeing memory?
            }
        }
    }

done:
    free(sampleBlock);
    Pa_Terminate();
    return err;
}

然而,代码有点精彩.有时,当我在Xcode中运行我的程序时,我得到以下输出：

06001

使用Xcode指向这一行是问题：

06002

其他时候我运行代码,我得到这个错误：

06003

这两个错误有点令我困惑…任何建议？

解决方法

你正在写出分配的缓冲区的边界：

recordedSamples = realloc(recordedSamples,size * i);
memcpy(recordedSamples + ((i - 1) * size),size);

realloc()分配一定数量的字节,这里size * i.生成的指针存储在具有float *类型的recordsSamples中.

memcpy()然后尝试将数据写入到记录样本((i – 1)* size)中,指针算术用于确定应写入的位置,由于recordsSamples的类型为float *,所以记录的样本X指向X的偏移量浮点值(不是X字节).

换句话说,recordingSamples((i – 1)* size指向recordSamples之后的内存位置((i – 1)* size * sizeof(float)),通常不在分配的缓冲区内,因为浮点大于单字节.

要解决这个问题,最大的问题是如果大小应该是多个字节或一些浮点数.这取决于您使用的API函数,我没有详细研究.

如果它是一些浮点数,那么您必须调整对malloc,realloc和memcpy等基本内存管理功能的调用,因为这些操作都是以字节为单位的.要取代malloc(size),你可以调用malloc(size * sizeof(float)).

如果大小确实是多个字节,那么将recordSamples作为char *,或者至少在使用字节偏移量进行指针运算(如memcpy((char *)recordsSamples …)之前将其转换为更合理的方式).

内存问题连续录制音频

解决方法

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