a0312615f2
Allow `WAVEFORMAT` (in addition to `WAVEFORMATEX`), which omits initialization data. Fix reading of bits per sample to use little endian byte order like the other reads. See also the wave format docs linked from https://learn.microsoft.com/en-us/windows/win32/directshow/avi-riff-file-reference#avi-stream-headers. PiperOrigin-RevId: 642962893