[gst-devel] Mixing signals

[Stefan Kost]

Hi Tristan,

can you post a link to your source?
The thing is, in buzztard I use the adder alot and son't have any such problems.
I generate the whole network and set it to playing then.

Stefan

> Ikke wrote:
> 
>> Hija,
>>
>> Today I've been playing around with the different elements in GStreamer
>> I'd need to create some sort of "sound mixer", mixing several input
>> signals together to one output (alsasink).
>>
>> The setup I tried to produce:
>>
>> src1  ---->   volume control 1   \
>>                                   \---->   adder   ---->   alsasink
>>                                   / src2  ---->   volume control 2   /
>>
>> (I hope this renders correctly in your mail reader)
>>
>> First I tried to get 2 sinesrc's (with a different frequency, playing
>> with sines is easy) working together. I *think* that worked (the output
>> was crippled though, I guess because of phase differences before the
>> adder).
>>
>> Now I tried mixing 2 MP3 files together (source code attached, you need
>> "test1.mp3" and "test2.mp3" in PWD of course). This just doesn't work. I
>> can play one file or the other, just by not linking one of the volume
>> controls to the adder (but I do register a sink on the adder), but when
>> I link both volume src's to 2 sinks of the adder, I get this GStreamer
>> message:
>>
>> (process:17870): GStreamer-WARNING **: pushing data on non-negotiated
>> pad decoder1:src, not allowed.
>>
>> No output is generated at all.
> 
> 
> I second that motion, I have a setup like this:
> 
> +----------------------------------------------------------------------+
> | +---------------------------+                                        |
> | | filesrc -> decrypt -> mad |                                        |
> | +---------------------------+                                        |
> |                            \                                         |
> |                           adder -> scaler -> converter -> alsasink   |
> |                            /                                         |
> | +---------------------------+                                        |
> | | filesrc -> decrypt -> mad |                                        |
> | +---------------------------+                                        |
> +----------------------------------------------------------------------+
> 
> (Note that decrypt is just a simple plugin I wrote to
> decrypt encrypted mp3 streams)
> 
> And I get the same behaviour, I use a GstBin for the
> "filesrc -> decrypt -> mad" part and use src ghostpads to
> link with the adder (similar to the mixer example in gstreamer
> package) and still the same results.
> 
> Ikke, did you end up solving this problem on your own ?
> 
> anyone have an idea what we are doing wrong with the adder ?
> 
> Cheers,
>                           -Tristan
> 
> 
> 
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