Opus always uses 48khz On Aug 1, 2013 2:15 PM, "Dimosthenis Arkoudeas" <dimosthenis@arkoudeas.com> wrote:
Hi all,****
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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…****
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In mod_opus.c :****
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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;****
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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.****
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And in Line 184 , I think the following parameters must be changed****
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switch_codec_interface_t *codec_interface;****
int samples = 480;****
int bytes = 960;****
int mss = 10000;****
int x = 0;****
int rate = 48000;****
int bits = 32000;****
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Can you propose any values about these parameters to achieve 8khz with 40ms packet time? ****
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Thanks for any help,****
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Dimosthenis****
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