On Mon, Dec 19, 2011 at 10:54 AM, Ganesh Borse <bganes...@gmail.com> wrote:
> I could know the use of unpack_from, but I could not understand the "fmt" > part, i.e *"%dH" % nframes * nchannels*. > Can you pls help me know, what is the purpose of two "%" signs in this > statement? > > That's python's string formatting. See http://docs.python.org/library/stdtypes.html#string-formatting-operations for details. Basically, it's building the format for the call to unpack_from on the fly. The "%dH" portion is calling for a single decimal value to become part of the string (that's the "%d" portion). That value comes from multiplying nframes by nchannels. So, for example, if nframes = 10 and nchannels = 24, then the string becomes "240H". That, in turn, tells the program to unpack a sequence of 240 unsigned short values from the buffer. -- Jerry
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