Return to LanScape's home page Go back a page...       Active TopicsActive Topics   Display List of Forum MembersMember List   Knowledge Base SearchSearch   HelpHelp  RegisterRegister  LoginLogin

LanScape VOIP Media Engine™ - Technical Support
 LanScape Support Forum -> LanScape VOIP Media Engine™ - Technical Support
Subject Topic: specific question about the "Mute" functionality Post ReplyPost New Topic
Author
Message << Prev Topic | Next Topic >>
chav
Intermediate
Intermediate


Joined: April 19 2005
Location: Canada
Posts: 6
Posted: April 20 2005 at 12:42pm | IP Logged Quote chav
thanks to your response,

so I put it in a more specific way:

What we want to do is to mute the microphone just like what the telephone users often do on their telephone sets. To Mute the microphone here means after a call has been set up(connected), when the user1 clicks on a certain button on the softphone, the user2 on the other side of the phoneline could not hear the voice from the user1, and the user1 can also release the Mute to let the user2 hear user1's voice again. I guess it fits your "Do you want to mute outgoing audio to phone lines when a call is active?" in your response.

And now that it seems the SDk also supports "Do you want to mute local audio playback?", we will appreciate it if you could also tell us how to do this one.

regards,

chev

Back to Top View chav's Profile Search for other posts by chav
 
support
Administrator
Administrator


Joined: January 26 2005
Location: United States
Posts: 1666
Posted: April 20 2005 at 2:59pm | IP Logged Quote support
Hi Chav,

We will be including more signal handling/procesing capabilities in upcoming releases of the VOIP Media Engine. For the version 5.10 Media Engine that you have, you will have to use 2 undocumented API procedures to implement dynamic "microphone mute" and "far end mute".

The following tech note will help you add this capability to your application. Right mouse click on the link below and select "Save Target As" when the IE menu pops up.


http://www.lanscapecorp.com/technotes/VoipMediaEngine510/TN2 730.txt


Best regards,

LanScape Support
Back to Top View support's Profile Search for other posts by support Visit support's Homepage
 
chav
Intermediate
Intermediate


Joined: April 19 2005
Location: Canada
Posts: 6
Posted: April 20 2005 at 7:04pm | IP Logged Quote chav
thanks to the link to the file with the apis.

we exactly followed those steps described in the technical note file to integrate the Mute functionality. But when compiling, the following errors occured. it seems the linker could not find the concreate body of the api:SetAudioRecordCallback and SetPlaybackMixerCallback, are they in the same engine dll as the other apis such as HoldLine etc? we have spent quite some time to solve this error but no achivement..

I copied the errors below for your reference.

regards,

chav
===========================error message================
error LNK2001: unresolved external symbol "enum TELEPHONY_RETURN_VALUE __cdecl SetAudioRecordCallback(void *,enum AUDIO_BANDWIDTH,int (__cdecl*)(struct AUDIO_RECORD_DATA *),void *)" (?SetAudioRecordCallback@@YA?AW4TELEPHONY
_RETURN_VALUE@@PAXW4AUDIO_BANDWIDTH@@P6AHPAUAUDIO_RECORD_DAT A@@@Z0@Z)


error LNK2001: unresolved external symbol "enum TELEPHONY_RETURN_VALUE __cdecl SetPlaybackMixerCallback(void *,enum AUDIO_BANDWIDTH,int (__cdecl*)(struct PLAYBACK_MIXER_DATA *),void *)" (?SetPlaybackMixerCallback@@YA?AW4TEL
EPHONY_RETURN_VALUE@@PAXW4AUDIO_BANDWIDTH@@P6AHPAUPLAYBACK_M IXER_DATA@@@Z0@Z)
    Back to Top View chav's Profile Search for other posts by chav
     
    support
    Administrator
    Administrator


    Joined: January 26 2005
    Location: United States
    Posts: 1666
    Posted: April 21 2005 at 8:04am | IP Logged Quote support
    Chav,

    In the SipTelephonyApi.h header file you modified, make sure the function prototypes you added are inside the extern "C" block. This will fix your "unresolved symbol" link errors.

    Also: When you call the SetPlaybackMixerCallback() and SetAudioRecordCallback() APIs, make sure the values you specify for the "pUserData" parameters are not NULL. If you do not need instance data specified, just set the "pUserData" parameter values to (void *)1.

    We will update the tech note to specify this more clearly.

    Back to Top View support's Profile Search for other posts by support Visit support's Homepage
     
    chav
    Intermediate
    Intermediate


    Joined: April 19 2005
    Location: Canada
    Posts: 6
    Posted: April 21 2005 at 3:39pm | IP Logged Quote chav
    Thanks to your last reply, the compiling error has been cleared.


    But now the problem is after we even forced to make the function "BOOL MediaEngineRecordComplete(AUDIO_RECORD_DATA *pAudioRecordData)" to return FALSE, the far end side of the phone line can still hear the voice from the near side. That means the audio recorded on the near side is still played to the output phonelines

    The senario is the call is initiated by the near side, so the near side is the caller and the far end side is the callee, and the "Mute" action hereby is activated by caller.


    We also tried the function:BOOL MediaEngineMasterPlaybackMixerComplete(PLAYBACK_MIXER_DATA *pPlaybackMixerData); it works, because after we forced it to return FALSE, the audio from far end side could not be played back on the near side, so the person on the near side could not hear the far end side.

    regards,

    Chav

    Back to Top View chav's Profile Search for other posts by chav
     
    support
    Administrator
    Administrator


    Joined: January 26 2005
    Location: United States
    Posts: 1666
    Posted: April 22 2005 at 7:19am | IP Logged Quote support

    Chav,

    I see there is a type-o in the tech note. Just return a non zero value in your MediaEngineRecordComplete() callback to mute your microphone audio that goes to all phone lines.

    Something just occurred to me, why don't you just put your phone lines on hold by calling the HoldLine() API procedure? Use the HoldLine() API procedure instead of the undocumented APIs if you can.

    Lanscape Support
    Back to Top View support's Profile Search for other posts by support Visit support's Homepage
     
    chav
    Intermediate
    Intermediate


    Joined: April 19 2005
    Location: Canada
    Posts: 6
    Posted: April 22 2005 at 7:09pm | IP Logged Quote chav
    Thanks to your reply, but it still does not work, the reason that we don't use the Hold to fake the Mute is we want to make the caller who initiates the "Mute" still be able to hear the other side.

    It seems the call back MediaEngineRecordComplete() is never called by the engine, is there any other possibility that causes this problem?

    regards,

    Chav
    Back to Top View chav's Profile Search for other posts by chav
     
    support
    Administrator
    Administrator


    Joined: January 26 2005
    Location: United States
    Posts: 1666
    Posted: April 25 2005 at 7:35am | IP Logged Quote support

    When you call the SetPlaybackMixerCallback() and SetAudioRecordCallback() APIs, make
    sure the values you specify for the "pUserData" parameters are not NULL. If you do not
    need instance data specified, just set the "pUserData" parameter values to (void *)1.

    The tech note from the link above has been updated. It may help to download it and read it again.

    We use these two API procedures in our own applications. They do work.

    Back to Top View support's Profile Search for other posts by support Visit support's Homepage
     

    If you wish to post a reply to this topic you must first login
    If you are not already registered you must first register

      Post ReplyPost New Topic
    Printable version Printable version

    Forum Jump
    		You cannot post new topics in this forum
    You cannot reply to topics in this forum
    You cannot delete your posts in this forum
    You cannot edit your posts in this forum
    You cannot create polls in this forum
    You cannot vote in polls in this forum





    Contact LanScape Hear what the Lawyers have to say How youm may use this site Read your privacy rights