Thank you very much
On 1月30日, 上午2时01分, rktb <[email protected]> wrote:
> Let me try to answer...
>
> Sync is determined by comparison the playback clock. (i) Any component
> can register to be notified of the clock state by registering to
> PVMFMediaClockStateObserver. (ii) To obtain the clock value itself,
> the component needs to implement the PvmiClockExtensionInterface
> interface (method SetClock). (iii) A MIO that implements these
> interfaces and makes use of them to control AV sync is known as an
> Active MIO.
>
> Now, theoretically, any component that implements these interfaces can
> control the clock, and hence the AV sync. But, practically, only the
> audio/video components have the means to compare the playback clock
> with another time value (duration played). So, "feedback to AV/Sync"
> does not depend on PvmiMIOControl.
>
> Also, there is really no "feedback" being given during the AV sync
> control. An active MIO component can only control the clock value. The
> MediaOutputNodePort has a reference of the playback clock. Before
> pushing out data to the corresponding MIO, it compares the clock value
> against the timestamp value of the media message being pushed out. If
> the playback clock is ahead of the timestamp by a fixed margin, the
> media message is dropped. And so on.
>
> -Ravi
>
> On Jan 29, 8:24 pm, hanchao3c <[email protected]> wrote:
>
>
>
> > Hi Spark .
>
> > I find Audio sink node can be implented base on MediaOutput
> > ( PvmiMIOControl) or a General Node.
> > Do you mean Only using MediaOutput , the Audio sink node can give
> > feedback to AV/Sync ?- 隐藏被引用文字 -
>
> - 显示引用的文字 -
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