[ogg-dev] libfishsound/liboggz: How to properly set e_o_s marker when encoding?
bobi at ingrahams.us
Mon May 20 09:28:15 PDT 2013
Perhaps I am really dense, but after writing an app to encode multi-stream
audio files using libfishsound and liboggz, I cannot figure out a way to
reliably determine the which packet is the FINAL packet output from the
encoder, so I can set the e_o_s flag on it.
What is the magic for determining WHEN to set the e_o_s marker on a packet
in the FishSoundEncoded callback function?
Even though I know when I write the last audio buffer with
fish_sound_encode_float(), I don't know how many packets my
FishSoundEncoded callback will receive as a result.
Therefore, how can I know which packet is indeed the last and therefore
set the e_o_s flag appropriately?
There seems to me no mechanism within FishSound to do this.
After thinking about it, I decided a good approach might be:
b. Let the callback queue all remaining packets via oggz_write_feed()
c. Manually set the e_o_s packet on the final packet in each oggz
internal stream queue.
d. Call oggz_run() to flush the queues to the output file.
Of course, this requires creating my own oggz function in order to gain
access to the internal per-stream queues.
But before I go that route:
a. Is this the best way to accomplish e_o_s handling?
b. Is the un-exported oggz_set_eos() function supposed to be used for
this purpose? It's there along with oggz_get_eos(), but is undocumented
Any helpful insights will be much appreciated.
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