MovieExportFromProceduresToDataRef is *almost* exactly what I need to
generate movies from raw sample data.
BUT...
I need this functionality in a situation where the export process is
driven by the availability of data samples. Unfortunately the
opposite is the case with MovieExportFromProceduresToDataRef where
the assumption is that sample data is immediately available for the
video and audio data source callbacks.
So...
a) Is there an alternative to using
MovieExportFromProceduresToDataRef (lower level APIs?) that achieves
the same function, but can be driven by data availability?
If you are creating a QuickTime movie you can use a compression
sequence. If you need to export to another file format you need to use
movie exporters.
b) Is it somehow possible to return a 'not ready yet, please call
back later' flag in the data source callbacks?
No.
c) Is it possible to buffer a set of audio and video samples, call
MovieExportFromProceduresToDataRef to do its thing and empty the
sample buffers, and then repeat this process appending to the same
DataRef (movie) each time?
Don't think so. If possible it might cause pops in the sound.
You need to call MovieExportFromProceduresToDataRef on a thread, but
this limits you to thread safe components.
Ultimately you may need to launch a helper application which just calls
MovieExportFromProceduresToDataRef. You send the frames from your main
app and put them in a buffer queue. In your data proc you wait on this
queue. Same method works for threads.
Jan E.
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