Class MMMFDevVideoPlayProxy

class MMMFDevVideoPlayProxy;

Description

MMMFDevVideoPlayProxy is the interface to the CMMFDevVideoPlay API implementation that the hardware devices use to deliver data back to the client and report their progress to the API implementation.

Members

Defined in MMMFDevVideoPlayProxy:
MdvppFatalError(), MdvppInitializeComplete(), MdvppNewBuffers(), MdvppNewPicture(), MdvppPictureLoss(), MdvppPictureLoss(), MdvppReferencePictureSelection(), MdvppReturnPicture(), MdvppSliceLoss(), MdvppStreamEnd(), MdvppSupplementalInformation(), MdvppTimedSnapshotComplete()

virtual void MdvppNewPicture(TVideoPicture *aPicture)=0;

Description

Delivers a new decoded picture to the client. The CMMFDevVideoPlay implementation will maintain a list of decoded pictures and implement GetNewPictureInfo() and NextPictureL() based on those. The pictures will be returned back to the hardware device using ReturnPicture().

Parameters

TVideoPicture *aPicture "The newly processed picture."

virtual void MdvppNewBuffers()=0;

Description

Notifies the client that one or more new empty input buffers are available. Called by the decoder hardware device.

virtual void MdvppReturnPicture(TVideoPicture *aPicture)=0;

Description

Returns a used input video picture back to the caller. Called by a post-processor hardware device after the picture has been processed and the picture source was the client, not another plug-in.

Parameters

TVideoPicture *aPicture "The picture to return."

virtual void MdvppSupplementalInformation(const TDesC8 &aData, const TTimeIntervalMicroSeconds &aTimestamp, const TPictureId &aPictureId)=0;

Description

Delivers supplemental information from a decoder hardware device to the client. The information is codec-dependent. The method is synchronous - the client MMMFDevVideoPlayObserver::MdvppSupplementalInformation() method is called immediately, and the memory for the supplemental information can be re-used when the call returns.

Parameters

const TDesC8 &aData "The supplemental data." const TTimeIntervalMicroSeconds &aTimestamp "The presentation timestamp for the picture that the supplemental data is part of." const TPictureId &aPictureId "Picture identifier for the picture. If a picture ID is not available, aPictureId.iIdType is set to ENone."

virtual void MdvppPictureLoss()=0;

Description

Back channel information, indicating a picture loss without specifying the lost picture.

virtual void MdvppPictureLoss(const TArray< TPictureId > &aPictures)=0;

Description

Back channel information, indicating the pictures that have been lost.

Parameters

const TArray< TPictureId > &aPictures "Picture identifiers for the lost pictures. The reference is only valid until the method returns."

virtual void MdvppSliceLoss(TUint aFirstMacroblock, TUint aNumMacroblocks, const TPictureId &aPicture)=0;

Description

Back channel information, indicating the loss of consecutive macroblocks in raster scan order.

Parameters

TUint aFirstMacroblock "The first lost macroblock. The macroblocks are numbered such that the macroblock in the upper left corner of the picture is considered macroblock number 1 and the number for each macroblock increases from left to right and then from top to bottom in raster-scan order." TUint aNumMacroblocks "The number of lost macroblocks that are consecutive in raster-scan order." const TPictureId &aPicture "The picture identifier for the picture where the macroblocks were lost. If the picture is not known, aPicture.iIdType is set to ENone. The reference is only valid until the method returns."

virtual void MdvppReferencePictureSelection(const TDesC8 &aSelectionData)=0;

Description

Back channel information from the decoder, indicating a reference picture selection request. The request is delivered as a coding-standard specific binary message. Reference picture selection can be used to select a pervious correctly transmitted picture to use as a reference in case later pictures have been lost.

Parameters

const TDesC8 &aSelectionData "The reference picture selection request message. The message format is coding-standard specific, and defined separately. The reference is only valid until the method returns."

virtual void MdvppTimedSnapshotComplete(TInt aError, TPictureData *aPictureData, const TTimeIntervalMicroSeconds &aPresentationTimestamp, const TPictureId &aPictureId)=0;

Description

Delivers a timed snapshot result to the client. The memory reserved for the snapshot picture can no longer be used in the device.

Parameters

TInt aError "An error code, KErrNone if no errors occurred. If an error occurred, the data in the snapshot may not be valid, but the memory can still be freed." TPictureData *aPictureData "The snapshot picture data." const TTimeIntervalMicroSeconds &aPresentationTimestamp "The presentation timestamp for the snapshot picture." const TPictureId &aPictureId "Picture identifier for the picture. If a picture ID is not available, aPictureId.iIdType is set to ENone."

virtual void MdvppFatalError(CMMFVideoHwDevice *aDevice, TInt aError)=0;

Description

Reports a fatal error to the client. The device must automatically stop processing video data when such errors occur, and may not do further processing before it has been deleted and re-created.

Parameters

CMMFVideoHwDevice *aDevice "The device that reported the error." TInt aError "The error code."

virtual void MdvppInitializeComplete(CMMFVideoHwDevice *aDevice, TInt aError)=0;

Description

Reports that an asynchronous Initialize() method has completed. The device is now ready for playback.

Parameters

CMMFVideoHwDevice *aDevice "The device that was initialzied." TInt aError "Initialization result error code, KErrNone if initialization was successful."

virtual void MdvppStreamEnd()=0;

Description

Reports that the input video stream end has been reached and all pictures have been processed. Called by each hardware device after their InputEnd() methods have been called and all data has been processed. The proxy implementation will notify the client about stream end when all hardware devices have called this method.