Changes between Version 5 and Version 7 of Ticket #1888


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Timestamp:
Oct 7, 2015 3:40:36 PM (9 years ago)
Author:
ismangil
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  • Ticket #1888

    • Property Summary changed from Support for WebRTC Accoustic Echo Cancellation to Support for WebRTC Acoustic Echo Cancellation

  • Ticket #1888 – Description

    v5 v7  
    33= How to build WebRTC = 
    44== Mac == 
    5 Refer to !WebRTC development guide [http://www.webrtc.org/native-code/development here]. 
     5Refer to WebRTC development guide [http://www.webrtc.org/native-code/development here]. 
    66 
    77Then configure PJSIP with: 
    … …  
    1111 
    1212== iOS (ARM) == 
    13 Refer to !WebRTC development guide [http://www.webrtc.org/native-code/ios here]. 
     13Refer to WebRTC development guide [http://www.webrtc.org/native-code/ios here]. 
    1414 
    1515PJSIP's auto configuration will look for the library in {{{out_ios/Release}}} folder, so make sure you set the output dir properly when building !WebRTC  
    … …  
    2727Android development is only supported on Linux (reference [http://www.webrtc.org/native-code/android here]), so if you use other platforms, you need to set up a Linux virtual machine. 
    2828 
    29 Alternatively, you can build the stripped down version of !WebRTC instead, which will only build the required AEC module and its required dependencies. These steps below are tested on a Mac machine: 
     29Alternatively, you can build the stripped down version of WebRTC instead, which will only build the required AEC module and its required dependencies. These steps below are tested on a Mac machine: 
    30301. Create a working directory, for example: {{{webrtc-android}}}. 
    31311. Go to the work dir and unzip {{{webrtc-android-jni.zip}}} (provided in the ticket attachment below). 
    … …  
    6060Then rebuild PJSIP. 
    6161 
    62 = How to use !WebRTC AEC = 
    63 To use !WebRTC AEC, specify the value {{{PJMEDIA_ECHO_WEBRTC}}} in {{{pjsua_media_config.ec_options}}} ({{{MediaConfig.ecOptions}}} for PJSUA2), and specify the delay estimate for sound card and system buffers in {{{pjsua_media_config.ec_tail_len}}} ({{{MediaConfig.ecTailLen}}} for PJSUA2). !WebRTC AEC's performance is very dependent on this delay calculation. A poor estimate, even by as little as 40ms, may affect the echo cancellation results greatly. Our !WebRTC wrapper has enabled the delay agnostic feature, which will adjust the delay accordingly, however it may take some time (5-10s or more) for the Aec module to learn the optimal delay, thus a good initial estimate is necessary for good EC quality in the beginning of a call. 
     62= How to use WebRTC AEC = 
     63To use WebRTC AEC, specify the value {{{PJMEDIA_ECHO_WEBRTC}}} in {{{pjsua_media_config.ec_options}}} ({{{MediaConfig.ecOptions}}} for PJSUA2), and specify the delay estimate for sound card and system buffers in {{{pjsua_media_config.ec_tail_len}}} ({{{MediaConfig.ecTailLen}}} for PJSUA2). !WebRTC AEC's performance is very dependent on this delay calculation. A poor estimate, even by as little as 40ms, may affect the echo cancellation results greatly. Our WebRTC wrapper has enabled the delay agnostic feature, which will adjust the delay accordingly, however it may take some time (5-10s or more) for the Aec module to learn the optimal delay, thus a good initial estimate is necessary for good EC quality in the beginning of a call. 
    6464 
    6565The delay should be '''at least''' as much as frame time (by default, ptime is 20ms) + {{{PJMEDIA_WSOLA_DELAY_MSEC}}} (the default is 5ms). 
    … …  
    7070}}} 
    7171 
    72 = Poor !WebRTC EC quality = 
     72= Poor WebRTC EC quality = 
    7373Disable {{{PJMEDIA_WEBRTC_AEC_USE_MOBILE}}} (set it to 0), then change the definition of {{{SHOW_DELAY_METRICS}}} in {{{pjmedia/src/pjmedia/echo_webrtc.c}}} to a non-zero value. For example, if you set to 250, with ptime 20ms, it will print the delay metrics stats every 5 seconds or so. 
    7474{{{