[h323plus] max RTP PDU size

[Simon Horne]

Alessandro

You are correct there is no way to pass to the codec the max RTP size. At
the time I found no particular need to.  If the plugin receives a parameter
9 (max-nal-unit-size) in the OLC it will limit the PDU size to the indicated
value. By Default the payload size for H.264 is 1400 meaning the PDU size is
1400 + header(12) .

You can change this in enc-ctx.cxx 
#define H264_PAYLOAD_SIZE      1400
#define H264_SINGLE_NAL_SIZE   1400

Make sure you set the parameter 9 in the plugin definition to force the
remote to send that size too.

Simon

-----Original Message-----
From: h323plus-bounces at lists.packetizer.com
[mailto:h323plus-bounces at lists.packetizer.com] On Behalf Of Alessandro
Angeli
Sent: Thursday, November 11, 2010 11:37 AM
To: h323plus at lists.packetizer.com
Subject: [h323plus] max RTP PDU size

.1.
It looks to me like proper packetization is left to the encoder and that the
max PDU size is actually outputDataSize, computed in
h323pluginmgr.cxx!H323PluginVideoCodec::Read() by asking the encoder through
CallCodecControl(GET_OUTPUT_DATA_SIZE_CONTROL).

However I can not seem to find a way for the application to specify a
different max PDU size (a lower one in my case) or even a way to tell the
encoder of such a choice (there is no SET_OUTPUT_DATA_SIZE_CONTROL). 
Is it possible to limit the max PDU size?

.2.
In h323pluginmgr.cxx!CallCodecControl(), wouldn't it make more sense to pass
the normalized codecControls->name to (*codecControls->control) instead of
name? After, you are doing a case-insensitive comparison.

--
Alessandro