[wdmaudiodev] Re: Max Number of Channels of a HDMI device
- From: Matthew van Eerde <Matthew.van.Eerde@xxxxxxxxxxxxx>
- To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Thu, 27 Dec 2012 16:43:21 +0000
Since you support more than two channels, you also need to override the default
data intersection handler.
http://msdn.microsoft.com/en-us/library/windows/hardware/ff536252(v=vs.85).aspx
The current implementation of the port driver's default handler is limited in
the types of data ranges that it can handle:
* Only PCM data formats
* Only mono and stereo audio streams
An adapter driver that supports non-PCM or multichannel formats should
implement a proprietary data-intersection handler instead of relying on the
port driver to handle data intersections for these formats.
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of JimiYeh@xxxxxxxxxx
Sent: Wednesday, December 26, 2012 11:55 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Max Number of Channels of a HDMI device
Hi all,
I am trying to write a WaveRT driver for HDMI on window7. I need to
report my data range according to the HDMI sink device
(Ex: monitor, amplifier, ...). When I attached the amplifier which can support
8 channel, The control panel will show the information
about the amplifier. I can see the correct sample size range, frequency range
except "Max number of Channels". "Max Number of Channels"
is 2. I have checked my data range in my code. I'm sure I set the
MaximumChannels is 8.
if(myELD->GetFormatSupport(LPCM))
{
DataRangeAudio[LPCM].DataRange.FormatSize =
sizeof(KSDATARANGE_AUDIO);
DataRangeAudio[LPCM].DataRange.Flags = 0;
DataRangeAudio[LPCM].DataRange.SampleSize = 0;
DataRangeAudio[LPCM].DataRange.Reserved = 0;
DataRangeAudio[LPCM].DataRange.MajorFormat =
KSDATAFORMAT_TYPE_AUDIO;
DataRangeAudio[LPCM].DataRange.SubFormat =
KSDATAFORMAT_SUBTYPE_PCM;
DataRangeAudio[LPCM].DataRange.Specifier =
KSDATAFORMAT_SPECIFIER_WAVEFORMATEX;
DataRangeAudio[LPCM].MaximumChannels =
myELD->GetFormatMaxChannel(LPCM);
DOUT(DBGJimi, ("Max Channel : %d",
DataRangeAudio[LPCM].MaximumChannels)); // the debug message is 8
DataRangeAudio[LPCM].MinimumBitsPerSample =
myELD->GetFormatMinBitDepth(LPCM);
DataRangeAudio[LPCM].MaximumBitsPerSample =
myELD->GetFormatMaxBitDepth(LPCM);
DataRangeAudio[LPCM].MinimumSampleFrequency =
myELD->GetFormatMinFrequency(LPCM);
DOUT(DBGJimi, ("Min rate : %d",
DataRangeAudio[LPCM].MinimumSampleFrequency));
DataRangeAudio[LPCM].MaximumSampleFrequency =
myELD->GetFormatMaxFrequency(LPCM);
DOUT(DBGJimi, ("Max rate : %d",
DataRangeAudio[LPCM].MaximumSampleFrequency));
pKsDataRange[DataRangeIndex] =
reinterpret_cast<KSDATARANGE*>(&DataRangeAudio[LPCM]);
DataRangeIndex++;
}
Thank you.
Best Regards,
Jimi
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