我需要知道8位数的“.wav”是否签名或未签名的PCM, 只需读取文件即可。 我不能使用“ javax. sound. samped. * ” 或音频系统库 。
In the wav File, 8-bit samples are stored as unsigned bytes, ranging from 0 to 255. The 16-bit samples are stored as signed integers in 2 s-complement.
8位(或以下) WAV 文件总是没有签名。 9位或以上总是签名:
每个样本都包含在整数 i 中。 i 的大小是需要包含指定样本大小的最小字节数。最小的字节首先存储。代表样本振幅的位数存储在最显著的 i 位数中,剩下的位数被设为零。
For example, if the sample size (recorded in nBitsPerSample) is 12 bits, then each sample is stored in a two-byte integer. The least significant four bits of the first (least significant) byte is set to zero.
不同尺寸的PCM波形样品的数据格式、最大值和最低值如下:
Multimedia Programming Interface and Data Specifications 1.0 - IBM/Microsoft, August 1991
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