我编写了一段代码，尝试在目录及其子文件夹中搜索两个 AIFF 文件，并使用 LibAIFF 库导入然后对它们执行一些处理操作。
第 1 部分：在目录中搜索文件
对于程序的这一部分，我需要查找具有已知名称（例如 SineSweepA.aiff 和 SineSweepB.aiff）的文件（可以认为是相同的 AIFF 文件，但文件名不同），然后构造它的绝对路径（我不知道的长度（因为我的程序需要在不同的计算机上工作，其中 AIFF 可以位于 a 内的不同子文件夹中MainDirectory- 请参见下面的代码）但知道长度将小于 200 个字符） . 我能够使用以下代码成功且始终如一地做到这一点：
void file_search(char* parentDir, char* subFolder, char* filenamePrefix, char* tempString, char* tempFilepath, int* foundFlag, int* level);
int32_t *import_sweeps(char* sweepFilepath, uint64_t* numSamples, int* numChannels, double* samplingRate, int* bitDepth, int* segmentSize, int* importFlag);
int main()
{
...
char MainDirectory[200] = "/Users/rrr/Documents/Foldername1/";
char tempFilepath[200], tempFilepathR[200], parentDir[200], filenamePrefix[200], subFolder[200], tempString[200];
int level = 0, foundFlag = 0;
int numChannels = 0;
int bitDepth;
int segmentSize;
int importFlag = 0;
int32_t *sweepRfile = NULL;
uint64_t numSamples = 0, numSamplesR = 0;
unsigned long templen;
double samplingRate = 0.0;
char *sweepFilepath = NULL, *sweepFilepathR = NULL; // Allocated to specific size later
strcpy(parentDir, MainDirectory);
strcat(parentDir, "SubFolderName1/");
strcpy(tempFilepathR, parentDir);
strcpy(filenamePrefix, "KnownFilenamePrefix1");
// file_search() searches for a specific file with a known name and constructs the absolute path to the file and stores it in tempFilepathR. The function is shown further below.
file_search(parentDir, subFolder, filenamePrefix, tempString, tempFilepath, &foundFlag, &level);
if (foundFlag)
{
sprintf(tempFilepath, "%s%s/KnownFilenamePrefix1%s.aiff", parentDir, subFolder, subFolder);
sprintf(tempFilepathR, "%s%s/KnownFilenamePrefix2%s.aiff", parentDir, subFolder, subFolder);
}
...
(to be continued in Part 2 of my question below)
}
void file_search(char* dir, char* subfolder, char* fileprefix, char* filename, char* filepath, int*flag, int* level)
{
DIR *dp;
struct dirent *entry; // entry is a pointer to the structure "dirent" defined in <dirent.h>
struct stat statbuf; // the structure "stat" is defined in <stat.h>
if((dp = opendir(dir)) == NULL) {
fprintf(stderr,"Cannot open directory: %s\n", dir);
return;
}
chdir(dir); // this sets the working directory to the string pointed to by "dir"
while((entry = readdir(dp)) != NULL)
{
lstat(entry->d_name, &statbuf);
if(S_ISDIR(statbuf.st_mode)) // Tests for a directory
{
// Found a directory
if(strcmp(".",entry->d_name) == 0 || strcmp("..",entry->d_name) == 0)
{
// Ignore . and ..
continue;
}
if(level[0] < 1)
{
// Proceed down one level and search again
strcpy(subfolder,entry->d_name);
level[0] = level[0] + 1;
// Recursive function call
file_search(entry->d_name, subfolder, fileprefix, filename, filepath, postfilepath, flag, level);
level[0] = level[0] - 1;
if(flag[0] == 1)
{
// Exit loop if a file was found at a lower level
break;
}
}
}
else
{
sprintf(filename, "%s%s.aiff", fileprefix, subfolder);
if(strcmp(entry->d_name,filename) == 0)
{
// File found. Construct absolute path to file
sprintf(filepath, "%s%s/%s", filepath, subfolder, filename); // Pass filepath outside
flag[0] = 1; //Appropriate file found
break;
}
}
}
chdir("..");
closedir(dp);
}
因此，通过使用上面的代码，我可以通过搜索具有已知文件名的子文件夹来成功搜索具有给定文件名的两个 AIFF 文件MainDirectory，构造它们的绝对路径并将它们存储在tempFilepath和中tempFilepathR。下一步是导入这两个文件，这是我遇到问题的地方。
第 2 部分：导入文件
我遇到的问题如下：我实现了 LibAIFF 库来导入文件。问题是，如果我运行程序，比如说 N 次，那么在某些运行中，第一个文件被导入但不是第二个，在其他运行中，第二个文件被导入但不是第一个（请注意，如果第一个文件没有t 被导入，程序停止）。在我解释错误之前，请知道 AIFF 文件没有问题，为了这个问题，您可以假设它们是相同的，甚至它们的绝对路径和文件名也是相同的，除了一个有后缀A.aiff，另一个B.aiff。这些文件路径以字符串形式存储在相同定义的变量 (tempFilepath和tempFilepathR) 中。
这是我的代码的其余必要部分，从上面继续
int main()
{
// Continued from above
...
// Copy over exact file paths (I had to do this because the function AIFF_OpenFile which is part of the LibAIFF library and shown below refused to accept a statically allocated char variable such as tempFilepath)
templen = strlen(tempFilepathR); // tempFilepath and tempFilepathR always have the same length
sweepFilepath = malloc(templen + 1);
strcpy(sweepFilepath, tempFilepath);
// Proceed to import the FIRST AIFF (returned to sweepRfile from import_sweeps())
sweepRfile = import_sweeps(sweepFilepath, &numSamples, &numChannels, &samplingRate, &bitDepth, &segmentSize, &importFlag);
if (importFlag) // The import was successful
{
free(sweepFilepath);
// Do some processing with the successfully imported AIFF
free(sweepRfile);
}
else // The import was unsuccessful and sweepRfile (which is usually malloc'ed in the import_sweeps() function is not malloc'ed
{
free(sweepFilepath);
}
// Now for the SECOND AIFF (I can overwrite a lot of the variables used for the first AIFF because I don't need them)
sweepFilepathR = malloc(templen + 1); // templen is assigned above
strcpy(sweepFilepathR, tempFilepathR);
// Proceed to import the SECOND AIFF (returned to sweepRfile from import_sweeps())
sweepRfile = import_sweeps(sweepFilepathR, &numSamplesR, &numChannels, &samplingRate, &bitDepth, &segmentSize, &importFlag);
if (importFlag) // The import was successful
{
free(sweepFilepathR);
// Do some processing with the successfully imported AIFF
free(sweepRfile);
}
else // The import was unsuccessful and sweepRfile (which is usually malloc'ed in the import_sweeps() function is not malloc'ed
{
free(sweepFilepathR);
}
...
// Rest of code in main is irrelevant because it doesn't even get there.
}
中断总是发生在 import_sweeps() 函数中（有时是第一个 AIFF，有时是第二个）。功能如下图
int32_t *import_sweeps(char* sweepFilepath, uint64_t* numSamples, int* numChannels, double* samplingRate, int* bitDepth, int* segmentSize, int* importFlag)
{
// Initialize files for importing */
AIFF_Ref fileref;
// Import Routine */
fileref = AIFF_OpenFile(sweepFilepath, F_RDONLY);
if(fileref)
{
// File opened successfully. Proceed to intialize files for getting information about AIFF file
uint64_t nSamples;
int nSamplePts, channels, bitsPerSample, segSize, temp;
double smpr;
// Get AIFF file format details
temp = AIFF_GetAudioFormat(fileref, &nSamples, &channels, &smpr, &bitsPerSample, &segSize);
if (temp < 1) {
fprintf(stderr,"Error getting audio format.\n");
AIFF_CloseFile(fileref);
return (int32_t) 0;
}
else
{
numSamples[0] = nSamples;
samplingRate[0] = smpr;
numChannels[0] = channels;
bitDepth[0] = bitsPerSample;
segmentSize[0] = segSize;
nSamplePts = ((int) nSamples)*channels;
int32_t *samples = malloc((nSamplePts+1) * sizeof(int32_t));
// Read AIFF
temp = AIFF_ReadSamples32Bit(fileref, samples, nSamplePts);
if (temp != -1)
{
AIFF_CloseFile(fileref);
importFlag[0] = 1;
return samples;
}
else
{
fprintf(stderr,"Unable to read AIFF.\n");
AIFF_CloseFile(fileref);
return (int32_t) 0;
}
}
}
else
{
fprintf(stderr,"Unable to open AIFF file.\n");
}
return (int32_t) 0;
}
在上面的 import_sweeps() 中，AIFF 文件总是通过调用函数成功读取AIFF_ReadSamples32Bit(fileref, samples, nSamplePts);。因此，温度值永远不会是-1。每当发生错误（如上所述，我将在下面给出实际的错误消息）时，它总是在尝试调用AIFF_CloseFile(fileref);.
下面显示的是LibAIFF 库AIFF_ReadSamples32Bit中AIFF_CloseFile定义的函数。
int AIFF_ReadSamples32Bit(AIFF_Ref r, int32_t * samples, int nSamplePoints)
{
int n = nSamplePoints;
void *buffer;
int i, j;
size_t h;
size_t len;
int segmentSize;
int32_t *dwords;
int16_t *words;
int8_t *sbytes;
uint8_t *inbytes;
uint8_t *outbytes;
uint8_t x, y, z;
if (!r || !(r->flags & F_RDONLY))
return -1;
if (n % (r->nChannels) != 0)
return 0;
if (n < 1 || r->segmentSize == 0) {
if (r->buffer) {
free(r->buffer);
r->buffer = NULL;
r->buflen = 0;
}
return -1;
}
segmentSize = r->segmentSize;
len = (size_t) n * segmentSize;
if ((r->buflen) < len) {
if (r->buffer)
free(r->buffer);
r->buffer = malloc(len);
if (!(r->buffer)) {
return -1;
}
r->buflen = len;
}
buffer = r->buffer;
h = AIFF_ReadSamples(r, buffer, len);
if (h < (size_t) segmentSize) {
free(r->buffer);
r->buffer = NULL;
r->buflen = 0;
return 0;
}
n = (int) h;
if (n % segmentSize != 0) {
free(r->buffer);
r->buffer = NULL;
r->buflen = 0;
return -1;
}
n /= segmentSize;
switch (segmentSize) {
case 4:
dwords = (int32_t *) buffer;
for (i = 0; i < n; ++i)
samples[i] = dwords[i];
break;
case 3:
inbytes = (uint8_t *) buffer;
outbytes = (uint8_t *) samples;
n <<= 2; /* n *= 4 */
j = 0;
for (i = 0; i < n; i += 4) {
x = inbytes[j++];
y = inbytes[j++];
z = inbytes[j++];
#ifdef WORDS_BIGENDIAN
outbytes[i] = x;
outbytes[i + 1] = y;
outbytes[i + 2] = z;
outbytes[i + 3] = 0;
#else
outbytes[i] = 0;
outbytes[i + 1] = x;
outbytes[i + 2] = y;
outbytes[i + 3] = z;
#endif
}
n >>= 2;
break;
case 2:
words = (int16_t *) buffer;
for (i = 0; i < n; ++i) {
samples[i] = (int32_t) (words[i]) << 16;
}
break;
case 1:
sbytes = (int8_t *) buffer;
for (i = 0; i < n; ++i) {
samples[i] = (int32_t) (sbytes[i]) << 24;
}
break;
}
return n;
}
和
int AIFF_CloseFile(AIFF_Ref ref)
{
int r;
if (!ref)
return -1;
if (ref->flags & F_RDONLY) {
AIFF_ReadClose(ref); // BREAK OCCURS HERE EVERYTIME
r = 1;
} else if (ref->flags & F_WRONLY) {
r = AIFF_WriteClose(ref);
} else {
r = -1;
}
return r;
}
休息发生在AIFF_ReadClose(ref);每次。所以我也在下面展示了这个功能。
static void AIFF_ReadClose(AIFF_Ref r)
{
if (r->buffer)
free(r->buffer);
if (r->buffer2)
free(r->buffer2); // THIS IS WHERE THE BREAK OCCURS EVERYTIME
Unprepare(r);
fclose(r->fd);
free(r);
return;
}
中断总是如上所示发生。以下是错误消息： (25693,0x7fff7db87310) malloc: * 对象 0x4000000000000000 的错误：未分配指针被释放 *在 malloc_error_break 中设置断点以进行调试
所以基本上，上述错误发生不可预测。当它不发生时，我的代码可以完美运行。非常感谢任何有关我如何解决此问题的帮助。
如果有人愿意下载 LIBAIFF 图书馆以进一步调查并帮助我，图书馆的链接是：http ://aifftools.sourceforge.net/libaiff/ 。
在此先感谢您的任何建议！