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Document the motivation for the 120 ms repacketizer limit.

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See the mailing list discussion at
http://lists.xiph.org/pipermail/opus/2014-December/002802.html
This commit is contained in:
Ralph Giles 2014-12-20 12:37:48 -08:00
parent 7424bb0a24
commit 5b712da9c2
1 changed files with 4 additions and 1 deletions
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include/opus.h
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@ -616,7 +616,10 @@ OPUS_EXPORT void opus_pcm_soft_clip(float *pcm, int frame_size, int channels, fl
* merged. Splitting valid Opus packets is always guaranteed to succeed,
* whereas merging valid packets only succeeds if all frames have the same
* mode, bandwidth, and frame size, and when the total duration of the merged
* packet is no more than 120 ms.
* packet is no more than 120 ms. The 120 ms limit comes from the
* specification and limits decoder memory requirements at a point where
* framing overhead becomes negligible.
*
* The repacketizer currently only operates on elementary Opus
* streams. It will not manipualte multistream packets successfully, except in
* the degenerate case where they consist of data from a single stream.