问题
Starting from this question I was made to understand how to deinterleave the left and right channel of a 16 bit PCM data.
My question now is, how will a 8 bit PCM be deinterleaved and "stretched" into a 16 bit value
回答1:
16-bit PCM has basically the same data bits and additional bits on the least significant bit side to specify the value and add accuracy and detail. Then 8-bit PCM is typically unsigned value with a centerpoint of 0x80, and 16-bit (also applicable to higher bitnesses) PCM is signed integer, so the conversion formula is:
UINT8 sample8 = ...;
INT16 sample16 = (INT16) (sample8 - 0x80) << 8;
来源：https://stackoverflow.com/questions/24449957/converting-a-8-bit-pcm-to-16-bit-pcm