c - 从 int16_t * 填充 float **

问题描述

我需要将 int16_t* 转换为浮点 **

我需要它们通过一个需要输入缓冲区的函数，例如：

const float * const * const buf,

浮动分配**

  micsbuf = (float **)malloc(CHANNELS * sizeof(float *));
  farbuf = (float **)malloc(CHANNELS*sizeof(float *));
  for(int c1 = 0;c1 < CHANNELS;c1++)
  {
    micsbuf[c1] = (float *)malloc(BUFFER_LENGTH*sizeof(float));
    farbuf[c1] = (float *)malloc(BUFFER_LENGTH*sizeof(float));

  }

其余代码：

while(!feof(infile) || !feof(outfile))
  {
    NreadNear = fillBufferIn(infile, &bufferIn, bytes);
    NreadFar = fillBufferOut(outfile,&bufferOut,bytes);

    int16_t *bufferInCasted = (int16_t *)bufferIn;
    int16_t *bufferOutCasted = (int16_t *)bufferOut;

    for(int i = 0 ; i < 480 ; i++)
    {
      for(int c2 = 0 ; c2 < CHANNELS ; c2 ++)
      {
        micsbuf[c2][i] = (float )bufferInCasted[i];
        micsbuf[c2][1+i*2] = (float )bufferInCasted[1+i*2];
        farbuf[c2][i] = (float )bufferOutCasted[i];
        farbuf[c2][1+i*2] = (float )bufferOutCasted[1+i*2];
      }
      printf("I:  %d\t", i);
      printf("Left Sample Near %d\t", bufferInCasted[i]);
      printf("Right Sample Near %d\t\t", bufferInCasted[1+i*2]);
      printf("Left Sample Far %d\t", bufferOutCasted[i]);
      printf("Right Sample Far %d\n\n", bufferOutCasted[1+i*2]);
    }
  }

问题是当我执行需要它的函数时，该函数会导致 Seg.Fault。它是专有库。

/**
 * @brief 
 * Should fill up the buffer;
 * @param mics 
 * @param bufferIn 
 * @return size_t 
 */ 
size_t fillBufferIn(FILE *in, void **buffer, size_t bytes) //1920 byte
{ 
  size_t Nread;
  /**
   * @brief 
   * Should return a buffer with float[][] so that it can read and write
   * Each time it read sizeof of two int16_t which are the left channel and right channel
   * 
   */
  *buffer = (void *)calloc(480,2*sizeof(int16_t));
  Nread = fread(*buffer, 2*sizeof(int16_t), 480, in);
  return 2*sizeof(int16_t)*Nread;
}

/**
 * @brief 
 * Should fill up the buffer
 * @param out 
 * @param bufferOut 
 * @param bytes 
 * @return size_t 
 */
size_t fillBufferOut(FILE *out, void **bufferOut, size_t bytes)
{
  *bufferOut = (void *)calloc(480,2*sizeof(int16_t));
  Nread = fread(*bufferOut, 2*sizeof(int16_t), 480, out);
  return 2*sizeof(int16_t)*Nread;
}

标签： cmalloc

解决方案

你的malloced 块micsbuf[c1]和farbuf[c1]只有它们需要的大小的一半。您需要为BUFFER_LENGTH左/右样本对提供空间。这是一个更正的版本：

  for(int c1 = 0;c1 < CHANNELS;c1++)
  {
     micsbuf[c1] = (float *)malloc(BUFFER_LENGTH*2*sizeof(float));
     farbuf[c1] = (float *)malloc(BUFFER_LENGTH*2*sizeof(float));

  }

填写和访问左右样本对的代码不正确。它会覆盖较早的样本并留下一些未填充的样本。左声道的索引应该从更改为i，i*2以便它们正好在右声道的索引之前1+i*2。这是一个更正的版本：

    for(int i = 0 ; i < 480 ; i++)
    {
      for(int c2 = 0 ; c2 < CHANNELS ; c2 ++)
      {
        micsbuf[c2][i*2] = (float )bufferInCasted[i*2];
        micsbuf[c2][1+i*2] = (float )bufferInCasted[1+i*2];
        farbuf[c2][i*2] = (float )bufferOutCasted[i*2];
        farbuf[c2][1+i*2] = (float )bufferOutCasted[1+i*2];
      }
      printf("I:  %d\t", i);
      printf("Left Sample Near %d\t", bufferInCasted[i*2]);
      printf("Right Sample Near %d\t\t", bufferInCasted[1+i*2]);
      printf("Left Sample Far %d\t", bufferOutCasted[i*2]);
      printf("Right Sample Far %d\n\n", bufferOutCasted[1+i*2]);
    }

您还应该考虑将480循环中的幻数替换为BUFFER_LENGTH是否正确或其他一些符号常数。

c - 从 int16_t * 填充 float **

问题描述

解决方案

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