On Aug 1, 2013 2:15 PM, "Dimosthenis Arkoudeas" <dimosthenis@arkoudeas.com> wrote:

Hi all,

 

Playing with mod_opus came up with the following.

I am trying to recompile the codec with 8Khz and 40ms ptime. I am not familiar with the codec internals and not really sure what parameters should I change…

 

In mod_opus.c :

 

 

Line 59:

int bitrate_bps = codec->implementation->bits_per_second;

                int use_vbr = 1;

                int complexity = 10;

                int use_inbandfec = 1;

                int use_dtx = 1;

                int bandwidth = OPUS_BANDWIDTH_FULLBAND;

                int err;

 

I suppose that the bandwidth must be changed to OPUS_BANDWIDTH_NARROWBAND and use_vbr=0 and I haven’t found yet whether the FEC parameter is passed to opus encoder.

 

And in Line 184 , I think the following parameters must be changed

 

 switch_codec_interface_t *codec_interface;

        int samples = 480;

        int bytes = 960;

        int mss = 10000;

        int x = 0;

        int rate = 48000;

        int bits = 32000;

 

 

Can you propose any values about these parameters to achieve 8khz with 40ms packet time?

 

 

Thanks for any help,

 

Dimosthenis

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