objective-c - 错误的值被复制到TPCircularBuffer

Question

TPCircularBuffer有点麻烦。

当我直接从回调缓冲区中打印出样本时，我会看到正确的值，但是一旦将它们复制到TPCircularBuffer中，它们就是不正确的。

有任何想法吗？

我已经在测试应用程序中使用了TPCircularBuffer，并且一切正常。

提前非常感谢您的帮助!

这些是代码的相关部分:

//  Declare and initialize TPCircularBuffer
TPCircularBuffer circularBuffer;
TPCircularBufferInit(&circularBuffer, 4096);

//  Callback stores signed integers in inBuffer->mAudioData.
SInt16 * buffer = (SInt16*) inBuffer->mAudioData;

int32_t availableBytes;

//  Each SInt16 is 2 bytes.
//  So, this should place 512 SInt16 values from the buffer
//  into the circularBuffer, right?
TPCircularBufferProduceBytes(&circularBuffer, &buffer, 1024);

SInt16 *ptr2 = TPCircularBufferTail(&circularBuffer, &availableBytes);
printf("Total byte size of buffer: %i\n", (int)availableBytes);
printf("circularBuffer[0] = %i\n", ptr2[0]);
printf("buffer[0] = %i\n", buffer[0]);

这是打印输出:

Total byte size of buffer: 1024
circularBuffer[0] = -16384
buffer[0] = 0

Answer 1

我不太确定您要问什么，所以这里有个简单的例子。

初始化:

TPCircularBuffer tpBuffer;
int secondsOfBuffer = 8;
float sampleRate = 44100.0;
int bufferByteSize = secondsOfBuffer * sampleRate * sizeof(SInt16);
TPCircularBufferInit(&tpBuffer, bufferByteSize);

写到头上:

int32_t availableBytes;
SInt16 *head = TPCircularBufferHead(&tpBuffer, &availableBytes);
int sampleCount = 1024;
for (int i = 0; i < 1024; i++) {
    head[i] = i;
}
TPCircularBufferProduce(&tpBuffer, sampleCount * sizeof(SInt16));

从尾读:

SInt16 *tail = TPCircularBufferTail(&tpBuffer, &availableBytes);
int32_t availableBytes;
int availableSamples = availableBytes / sizeof(SInt16);
for (int i = 0; i < availableSamples; i++) {
    printf("%i\n",tail[i]);
}
TPCircularBufferConsume(&tpBuffer, sizeof(SInt16) * sampleCount);