#107 DirectShowSource option to force audio channel count

[pspost]

Hi!

DirectShowSource loaded movie file with 6 channels PCM audio. However it was definitely stereo. GraphStudioNext renders graph with filters all have 2 channel In/Out pins.

My fix.
I downloaded sources of DirectShowSource plugin and added one line:

HRESULT GetSample::InternalQueryAccept(const AM_MEDIA_TYPE* pmt, VideoInfo &vi)
...........................................
WAVEFORMATEX* wex = (WAVEFORMATEX*)pmt->pbFormat;

>>>> if(wex->nChannels != 2) return S_FALSE;

I hardcoded stereo here and it solved my issue. It successfully passed then with value
wex->nChannels == 2.

Maybe you should add it as an option in DirectShowSource constructor if one wants to try force channels count.

Also I found this topic so the problem is not only mine:
http://forum.doom9.org/archive/index.php/t-160109.html

[Ian Brabham]

Of course your patch disallows any mono or genuine multi channel pin connections.

But I see your problem, the audio decoder bids 6 channel first even for stereo sources, DirectShowSource accepts the bid. With your patch, you refuse the 6 channel bid, so it next bids 2 channel, which you then accept.

Which audio decoder is giving this behaviour?

I have reassigned this as a Feature Request "DirectShowSource option to force audio channel count"

[pspost]

Sorry for late respond

>>Which audio decoder is giving this behaviour?
I dont know. How can I find it put?

My graph looks like this:
1. Haali Media Splitter 1.11.288.0
2. Microsoft DTV-DVD Audio Decoder
3. ffdshow Audio Decoder
4. Default DirectSound Device