Re: 96kHz 24bit WAV playback

Hi Greg,

OK thanks. I don't really have time to dig too much into this either at 
the moment unfortunately. I guess we just say no to this for now unless 
our customer wants to investigate themselves..

John.


Greg Wright wrote:
> John Stirling wrote:
>> Any chance we could get a comment from one of your experts on .wav 
>> playback (Jon/Ken I presume) before we start digging into this any 
>> more ?
>>
>
> John,
>
> I don't have time to dig too deep, but I downloaded the file
>
>    Test_File_2_0_STEREO_PCM.wav
>
> from http://www.itrax.com/Pages/HelpFAQs.php#1 (PCM 96/24 2.0 stereo)
>
>
> It won't play back in splay because of a failure in:
>
>     HX_RESULT CPCMAudioFormat::Init(IHXValues* pHeader)
>
>
> It does:
>
>       retVal = pHeader->GetPropertyCString("MimeType", pMimeTypeStr);
>
> then:
>
>            else if (!strcmp(pszMimeType, "audio/x-pn-wav"))
>             {
>                 m_ucMimeType = kMimeTypeAudioXPNWav;
>             }
>
> Finally:
>
>                 // Get the opaque data
>                 IHXBuffer* pBuffer = NULL;
>                 retVal = pHeader->GetPropertyBuffer("OpaqueData", 
> pBuffer);
>                 if (SUCCEEDED(retVal))
>
>
> There appears to be no OpaqueData, it returns HXR_FAIL, and ends
> up returning that error back up the chain. It does that for 2
> renderers.
>
> Not sure if that is much of a clue or not.
>
> --greg.
>
>
>
>>
>> Eric Hyche wrote:
>>> Hard to tell when using PC RealPlayer as comparison. It
>>> uses DirectX to play back .wav files, and not Helix,
>>> the Windows RealPlayer might be able to play it back
>>> but Helix still might not.
>>>
>>> If the changes suggested below by Greg didn't work,
>>> then further investigation is needed to find out
>>> why.
>>>
>>> Eric
>>>
>>> =======================================
>>> Eric Hyche ([email protected])
>>> Principal Engineer
>>> RealNetworks, Inc.
>>>
>>>
>>>  
>>>> -----Original Message-----
>>>> From: [email protected] 
>>>> [mailto:[email protected]]
>>>> On Behalf Of John Stirling
>>>> Sent: Tuesday, December 23, 2008 4:14 AM
>>>> To: [email protected]
>>>> Subject: Re: [Helix-client-dev] 96kHz 24bit WAV playback
>>>>
>>>> I heard a rumour that the PC real player now supports 24/96 playback ?
>>>>
>>>> If so, is it possible to port those changes to cayenne ?
>>>>
>>>> John
>>>>
>>>>
>>>> John Stirling wrote:
>>>>    
>>>>> I added 96000 into that list but still can't play the file.
>>>>>
>>>>> Is there anything else easy to try ?
>>>>>
>>>>> John
>>>>>
>>>>>
>>>>> John Stirling wrote:
>>>>>      
>>>>>> Thanks (I remember that list)
>>>>>>
>>>>>> re 24 bit -
>>>>>>
>>>>>> . if the audio device only supports 16 bit would you expect the
>>>>>> core/resampler to handle that ?
>>>>>> . if the audio device supports 24 bit would the core be able to
>>>>>> output in 24 bit ?
>>>>>>
>>>>>> John
>>>>>>
>>>>>>
>>>>>> Greg Wright wrote:
>>>>>>        
>>>>>>> From hxaudses.cpp:
>>>>>>>
>>>>>>> const unsigned short z_anValidSampleRates[] = { 8000,
>>>>>>>                                                 11025,
>>>>>>>                                                 16000,
>>>>>>>                                                 22050,
>>>>>>>                                                 32000,
>>>>>>>                                                 44100,
>>>>>>>                                                 48000,
>>>>>>>                                                 49512
>>>>>>>                                               };
>>>>>>>
>>>>>>> You might need to expand that list at least.
>>>>>>>
>>>>>>>
>>>>>>> --greg.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> John Stirling wrote:
>>>>>>>          
>>>>>>>> I tried a sample track on RealPlayer10 on windows and it didn't 
>>>>>>>> work.
>>>>>>>>
>>>>>>>> The same track could play ok via itunes, but not via WMP10.
>>>>>>>>
>>>>>>>> See:
>>>>>>>> http://www.itrax.com/Pages/HelpFAQs.php#1
>>>>>>>> for track we're trying to play
>>>>>>>>
>>>>>>>> John
>>>>>>>>
>>>>>>>>
>>>>>>>> Eric Hyche wrote:
>>>>>>>>            
>>>>>>>>> I was hoping someone else would answer, since
>>>>>>>>> I'm not 100% certain of my answer... :-)
>>>>>>>>>
>>>>>>>>> If you are talking about playing back a raw
>>>>>>>>> 96kHz 24-bit-per-sample .wav file, then I can't
>>>>>>>>> think of a reason that *wouldn't* work, assuming
>>>>>>>>> the audio device could be opened at 96kHz
>>>>>>>>> and 24bits. If it couldn't be, then it would
>>>>>>>>> have to go through a few other layers of the
>>>>>>>>> system (resampler, etc.) which I *believe* suport
>>>>>>>>> this format, but I'm not sure.
>>>>>>>>>
>>>>>>>>> Jon/Ken: do you know if this would work, or
>>>>>>>>> have you ever tried 96kHz/24-bit playback?
>>>>>>>>>
>>>>>>>>> Eric
>>>>>>>>>
>>>>>>>>> =============================================
>>>>>>>>> Eric Hyche ([email protected])
>>>>>>>>> Technical Lead
>>>>>>>>> RealNetworks, Inc.
>>>>>>>>>              
>>>>>>>>>> -----Original Message-----
>>>>>>>>>> From: [email protected]
>>>>>>>>>> [mailto:[email protected]] On 
>>>>>>>>>> Behalf Of
>>>>>>>>>> John Stirling
>>>>>>>>>> Sent: Friday, January 18, 2008 5:04 AM
>>>>>>>>>> To: [email protected]
>>>>>>>>>> Subject: Re: [Helix-client-dev] 96kHz 24bit WAV playback
>>>>>>>>>>
>>>>>>>>>> Any response on this ?
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> John Stirling wrote:
>>>>>>>>>>
>>>>>>>>>>                
>>>>>>>>>>> Is 96khz, 24bit WAV supported on cayenne1_5_0 ?
>>>>>>>>>>>
>>>>>>>>>>> Seems a bit excessive, but someone is asking..
>>>>>>>>>>>
>>>>>>>>>>> John
>>>>>>>>>>>
>>>>>>>>>>> _______________________________________________
>>>>>>>>>>> Helix-client-dev mailing list
>>>>>>>>>>> [email protected]
>>>>>>>>>>> http://lists.helixcommunity.org/mailman/listinfo/helix-client-dev 
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>                   
>>>>>>>>>> _______________________________________________
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>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>                 
>>>>>>>>>               
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>>>>>>>>
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