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 > > > > > > _______________________________________________ > Freeswitch-users mailing list > Freeswitch-users@lists.freeswitch.org > http://lists.freeswitch.org/mailman/listinfo/freeswitch-users > UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users > http://www.freeswitch.org >
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