[FFmpeg-devel] Some ideas for a tiny set of audio conversion functions..

[Andreas Öman]

... or a replacement of DSPContext->float_to_int16()

I've been given this some thought and I've come up with
some thoughts that I realized into code.

The idea is to support

* any number of channels
* both planar and interleaved data
* mixing of multiple sources into one output channel

If this is the right way to go i'll continue to write some
convenience functions, SSE-implementations and make some test
with the current codecs that output floats internally.

The file is currently just standalone.

Comments?
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