Hello Omar,
Omar Yoong wrote:
Hello,
i just managed to compile and install SEMS Wideband Version. I've read
in older posts that it should support stereo but when i set up a
conference call the other participant can not hear anything (using L16
stereo). When using mono everything is fine...
Do i have to change some settings in a configure file or modify the
source code? I've seen there's a file called AmMultiPartyMixer.cpp. Is
this maybe the one to have an eye on? Would be nice if you could give me
some detailed informations because my C++ knowledge is quite rusty.
indeed, the source code needs to be adapted to support stereo in
wideband branch conference.
In the AmConferenceChannel, which is the AmAudio implementation to
connect to a conference, you can find out the number of channels by
inspecting fmt->channels. You can then either use different conference
channels from the mixer for right and left (e.g. with different
channel_id, like channel_id+"_0" and channel_id+"_1", ...), or pass
the channel count to PutChannelPacket/GetChannelPacket and have the
conference channels handle stereo channels.
The samples in the audio buffer are interleaved for more than one
channel. Yo you get in *buffer something like
<sample0_left><sample0_right><sample1_left><sample1_right>...
In apps/examples/jack/AmAudioJackAudio you can find code to
interleave/deinterleave them to separate buffers; with jack the
samples of the channels need to be separate, i.e.
<sample0_left><sample1_left>...<sample0_right><sample1_right>...
hth
Stefan
Thanks
Omar
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Stefan Sayer
VoIP Services Consulting and Development
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10243 Berlin
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