RE: [Audio-dev] RE: delay Resume for DSP Device

I have noticed that the base audio renderer overrides the pushdown value if the HELIX_CONFIG_MIN_PCM_PUSHDOWN_BYTES is enabled.

In function CAudioRenderer::StartStream 

#ifdef HELIX_CONFIG_MIN_PCM_PUSHDOWN_BYTES
        if( m_pAudioPlayer )
        {
            m_pAudioPlayer->QueryInterface(IID_IHXAudioPushdown2, (void**) &pAudioPushdown2);
            if( pAudioPushdown2 )
            {
                pAudioPushdown2->SetAudioPushdown( MINIMAL_AUDIO_PUSHDOWN );
                pAudioPushdown2->Release();
            }
        }
#endif // HELIX_CONFIG_MIN_PCM_PUSHDOWN_BYTES


Not sure, if it helps.

Thanks,
Rajesh.


-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of ext Nguyen, Khanh V
Sent: Monday, May 04, 2009 8:36 PM
To: [email protected]; [email protected]; [email protected]
Subject: RE: [Audio-dev] RE: delay Resume for DSP Device

Oh.  I could see that now.  SetPushdownAudio was called before SetGranularity, but that shouldn't matter, since the value is saved in m_ulTargetPushdown.

Somehow, I set the minimum pushdown to 2 seconds, my buffer is 1 second, but Resume always called before my buffer has been filled.  Could you direct me to where in the code I can look to debug this?

Thanks,
--Khanh

-----Original Message-----
From: Eric Hyche [mailto:[email protected]]
Sent: Monday, May 04, 2009 6:32 AM
To: Nguyen, Khanh V; [email protected]; [email protected]
Subject: RE: [Audio-dev] RE: delay Resume for DSP Device

The granularity should already be getting set when the audio player is set up. The IHXPlayer calls CHXAudioPlayer::Setup(), which sets the granularity. CHXAudioPlayer::Setup in turn calls SetGranularity on the audio session.

Eric

=======================================
Eric Hyche ([email protected])
Principal Engineer
RealNetworks, Inc.


>-----Original Message-----
>From: Nguyen, Khanh V [mailto:[email protected]]
>Sent: Friday, May 01, 2009 7:25 PM
>To: [email protected]; [email protected]; 
>[email protected]
>Subject: RE: [Audio-dev] RE: delay Resume for DSP Device
>
>Thanks Eric.
>I'm assuming that minimum audio pushdown can be changed with 
>SetAudioPushdown() call?  I've stepping through the SetAudioPushdown() 
>call, but in the UpdateMininumPushdown(), it didn't do anything because 
>m_ulGranularity is 0.  Does it mean I have to set granularity before I call SetAudioPushdown to make sure the new minimum audio pushdown can be set?
>
>Thanks,
>--Khanh
>
>>-----Original Message-----
>>From: Eric Hyche [mailto:[email protected]]
>>Sent: Friday, May 01, 2009 6:29 AM
>>To: Nguyen, Khanh V; [email protected]; helix-client- 
>>[email protected]
>>Subject: RE: [Audio-dev] RE: delay Resume for DSP Device
>>
>>Yes, you can be guaranteed that playback will not begin until the 
>>minimum audio pushdown has been satisfied.


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