Dear Benny,
Thanks for your quick response and suggestion.
I think there are pretty similar between null_port.c and mem_player.c.
Now, I set local device to null snd device and connect to a wifi phone(mic/speaker work well).
1: I try to record PCM data to a file where I put my record code in clock_callback(master_port.c).
I want to record PCM data after the pjsip get frame from downstream port.
But the PCM data I recorded seems not correct voice stream data from wifi phone.
2: I also record frame->buf to the file after read_port() in the get_frame() conference.c .
I can get the correct PCM data which is the voice stream from remote device(wifi phone).
I confused about why I can record voice stream data from remote device after read_port() in get_frame() conference.c
But I save frame->buf out of second for loop which "Get frames from all ports, and "mix" the signal to mix_buf of all listeners of the port."
I save lot of garbage data in the file and I cannot open it by stream editor software on WinXP.
I don't understand why get_frame() pass the data of frame->buf which get from read_port() back to frame (pjmedia_port_get_frame(m->d_port, &frame);) fail after it get out of the second for loop in get_frame() conference.c
Sorry for my poor English.
Thanks for your HELP!!!!!!! You are so cool!!!
BR,
Duncan
-----Original Message-----
From: pjsip-bounces@xxxxxxxxxxxxxxx [mailto:pjsip-bounces at lists.pjsip.org] On Behalf Of Benny Prijono
Sent: Tuesday, January 12, 2010 10:37 PM
To: pjsip list
Subject: Re: NULL device audio question
On Tue, Jan 12, 2010 at 7:13 AM, Duncan.Lee <Duncan.Lee at tw.fujitsu.com> wrote:
> Dear All & Benny,
>
> I am using simple_pjsua to do the call test. There is no sound
> device on my board. I set the sound device to null sound device.
>
> But now I try to play a PCM file and make remote client can heard the PCM
> data.
>
> My question is as below
>
> 1: Should I put the PCM file reader code in null_put_frame() (in
> null_port.c) and send PCM data to conference bridge? Is that a correct way?
>
> 2: How can I send PCM data to conference bridge and make put_frame() (in
> conference.c) can put the data to do the decode/encode
>
The best way is to create a PCM file player, then connect it to the
bridge as usual to play with it. You can use memory player port as a
starting point, see mem_port.h/c. Or if you just want to try out your
board, why don't you just convert the PCM file to WAV and use existing
WAV player.
Cheers
Benny
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