FYI, these are good questions but they probably belong on the dev list since
they are so technical in nature. :)
-MC
On Fri, Apr 3, 2009 at 6:20 AM, Lele Forzani l...@windmill.it wrote:
Hello,
I've been experimenting with the use of mod_dahdi_codec and other ways
to perform external transcoding for codecs, and came up with noticing
that transcoding resources seemed to be used up twice what I expected.
That is and 2x the number of call legs, ending up to two encoder and two
decoder instances per leg.
So, I looked at the code and noticed almost every endpoint module does
something like this (excerpt from mod_sofia, sofia_glue.c:~1800):
if (switch_core_codec_init(tech_pvt-read_codec,
tech_pvt-iananame,
tech_pvt-rm_fmtp,
tech_pvt-rm_rate,
tech_pvt-codec_ms,
1,
SWITCH_CODEC_FLAG_ENCODE | SWITCH_CODEC_FLAG_DECODE |
tech_pvt-profile-codec_flags,
NULL, switch_core_session_get_pool(tech_pvt-session)) !=
SWITCH_STATUS_SUCCESS) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, Can't load
codec?\n);
switch_goto_status(SWITCH_STATUS_FALSE, end);
}
if (switch_core_codec_init(tech_pvt-write_codec,
tech_pvt-iananame,
tech_pvt-rm_fmtp,
tech_pvt-rm_rate,
tech_pvt-codec_ms,
1,
SWITCH_CODEC_FLAG_ENCODE | SWITCH_CODEC_FLAG_DECODE |
tech_pvt-profile-codec_flags,
NULL, switch_core_session_get_pool(tech_pvt-session)) !=
SWITCH_STATUS_SUCCESS) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, Can't load
codec?\n);
switch_goto_status(SWITCH_STATUS_FALSE, end);
}
The flags being SWITCH_CODEC_FLAG_ENCODE | SWITCH_CODEC_FLAG_DECODE
seems to be causing the apparent 'double' allocation of transcoding
resources, and I fail to understand the need for both, in both cases.
Could someone please spend a minute to explain?
thanks
lele
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