August 2013 - freeswitch-dev@lists.freeswitch.org

[Freeswitch-dev] Recompile mod_opus for 8KHz sampling rate
by Dimosthenis Arkoudeas 05 Aug '13

05 Aug '13

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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[Freeswitch-dev] two rtp questions - rtp debug and non block rtp read
by Seven Du 05 Aug '13

05 Aug '13

Hi, 1) when use switch_rtp without a session SWITCH_RTP_FLAG_DEBUG_RTP_READ complaining no session attached because it use SWITCH_CHANNEL_SESSION_LOG. Suggested fix: use SWITCH_CHANNEL_SESSION_LOG where possible and SWITCH_CHANNEL_LOG when no session. also, I think the following code is wrong because there's no rtp_session->session: if (!rtp_session->session) { rtp_session->flags[SWITCH_RTP_FLAG_DEBUG_RTP_READ] = 0; switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(rtp_session->session), SWITCH_LOG_CRIT, "RTP HAS NO SESSION!\n"); } else { ... I can fix and push if confirmed. 2) switch_rtp_zerocopy_read_frame() blocks forever if no RTP comes. Anyway to make it non block? I tried the following code it blocks even with SWITCH_IO_FLAG_NOBLOCK. I tried the following code in mod_skel, I can make a diff if necessary. rtp_flag[SWITCH_RTP_FLAG_IO] = 1; rtp_flag[SWITCH_RTP_FLAG_AUTOADJ] = 1; rtp_flag[SWITCH_RTP_FLAG_DATAWAIT] = 0; rtp_flag[SWITCH_RTP_FLAG_VIDEO] = 1; rtp_flag[SWITCH_RTP_FLAG_NOBLOCK] = 1; rtp_flag[SWITCH_RTP_FLAG_AUTO_CNG] = 1; // rtp_flag[SWITCH_RTP_FLAG_DEBUG_RTP_READ] = 1; // rtp_flag[SWITCH_RTP_FLAG_DEBUG_RTP_WRITE] = 1; rtp_session = switch_rtp_new(IP, //local 50002, //recv port IP, 42000, //remote, doesn't matter for us, but can't be 0 96, // payload_type 1, 90000, rtp_flag, NULL, &err, pool); if (!rtp_session) { switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "RTP Error: %s\n", err); goto done; } while(!done) { // status = switch_rtp_zerocopy_read_frame(rtp_session, &read_frame, SWITCH_IO_FLAG_NOBLOCK); status = switch_rtp_zerocopy_read_frame(rtp_session, &read_frame, SWITCH_IO_FLAG_NONE); switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "read %d\n", read_frame.packetlen); switch_yield(100000); } Thanks for help. -- Seven Du http://www.freeswitch.org.cn http://about.me/dujinfang http://www.dujinfang.com Sent with Sparrow (http://www.sparrowmailapp.com/?sig)

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[Freeswitch-dev] Need help in Mod_SMS ChatPlan
by thomas lee 02 Aug '13

02 Aug '13

Hi, Has anyone manage to get chatplan working? I only manage to get echo back from server and never succeed in sending the message across to other party. Does anyone has a sample working chatplan for me to reference? Best Regards, Thomas

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[Freeswitch-dev] Query regarding the RTP stack in freeswitch
by shashank chaudhary 02 Aug '13

02 Aug '13

Hi, I m using freeswitch 1.2.7 and it's works fine. But I want to know wether it is possible to use hard DSP instead of Soft DSP used by freeswitch to handle the media. If possible then please let me know the solution. Thanks, Regards, Shashank Chaudhary Senior Engineer(R&D)

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