SoundIoPrivate.instream_begin_read

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
struct SoundIoPrivate
extern (C) @nogc nothrow
int function(SoundIoPrivate*, SoundIoInStreamPrivate*, SoundIoChannelArea** out_areas, int* out_frame_count) instream_begin_read;

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