| class TImageConvStreamedDecode |
'Block' streaming extension for Image Conversion Library decoder.
| Public Member Functions | |
|---|---|
| IMPORT_C void | GetBlocks(TRequestStatus &, CImageFrame &, TInt, TInt, TInt &) |
| IMPORT_C TInt | GetBufferSize(TUid, TSize &, TInt) |
| IMPORT_C void | GetCapabilities(TUid, TInt, TDecodeStreamCaps &) |
| IMPORT_C void | GetNextBlocks(TRequestStatus &, CImageFrame &, TInt, TInt &, TBool &) |
| IMPORT_C void | GetSupportedFormatsL(RArray< TUid > &, TUid &) |
| IMPORT_C void | InitFrameL(TUid, TInt, TDecodeStreamCaps::TNavigation) |
| Private Member Functions | |
|---|---|
| TImageConvStreamedDecode() | |
| void | SetExtension(MImageConvExtension *) |
| Private Attributes | |
|---|---|
| MImageConvStreamedDecode * | iExtension |
| TInt | iReserved |
| IMPORT_C void | GetBlocks | ( | TRequestStatus & | aStatus, |
| CImageFrame & | aFrame, | |||
| TInt | aSeqPosition, | |||
| TInt | aNumBlocksToGet, | |||
| TInt & | aNumBlocksRead | |||
| ) | ||||
Start asynchronous call to return random blocks from the stream
use CImageDecoder::Cancel() to cancel this request.
| TRequestStatus & aStatus | request status |
| CImageFrame & aFrame | An image frame wrapper a memory buffer to hold the returned block(s) of pixel data. This can be 'uninitialised' or given specific format which must match that specified in the InitFrameL call. |
| TInt aSeqPosition | block number starting at top left 0 ... TDecodeStreamCaps::StreamSizeInBlocks() |
| TInt aNumBlocksToGet | number of blocks requested |
| TInt & aNumBlocksRead | number of blocks which will be returned when the request completes |
| IMPORT_C TInt | GetBufferSize | ( | TUid | aFormat, |
| TSize & | aBlockSizeInPixels, | |||
| TInt | aNumBlocks | |||
| ) | const | |||
Get the size of the memory buffer to hold the returned data.
The memory buffer size in bytes to hold the requested blocks. System wide error if for example the format is not supported.
| TUid aFormat | the required format |
| TSize & aBlockSizeInPixels | returns the size in pixels of the block returned from the stream when aNumBlocks of minimum block size are requested. |
| TInt aNumBlocks | the number of blocks of size TDecodeStreamCaps::MinBlockSizeInPixels() to be returned by one request |
| IMPORT_C void | GetCapabilities | ( | TUid | aFormat, |
| TInt | aFrameNumber, | |||
| TDecodeStreamCaps & | aCaps | |||
| ) | const | |||
Returns the capabilities of the codec plugin for a specific format and for a specific frame.
| TUid aFormat | The format. |
| TInt aFrameNumber | frame to stream |
| TDecodeStreamCaps & aCaps | The capabilities for the format given. |
| IMPORT_C void | GetNextBlocks | ( | TRequestStatus & | aStatus, |
| CImageFrame & | aFrame, | |||
| TInt | aNumBlocksToGet, | |||
| TInt & | aNumBlocksRead, | |||
| TBool & | aHaveMoreBlocks | |||
| ) | ||||
Start asynchronous call to return blocks sequentially from the stream. Blocks are returned from the first block until the last in the stream.
use CImageDecoder::Cancel() to cancel this request.
| TRequestStatus & aStatus | request status |
| CImageFrame & aFrame | An image frame wrapper a memory buffer to hold the returned block(s) of pixel data. This can be 'uninitialised' or given specific format which must match that specified in the InitFrameL call. |
| TInt aNumBlocksToGet | number of blocks requested |
| TInt & aNumBlocksRead | number of blocks which will be returned when the request completes |
| TBool & aHaveMoreBlocks |
| IMPORT_C void | GetSupportedFormatsL | ( | RArray< TUid > & | aFormats, |
| TUid & | aOptimalFormat | |||
| ) | const | |||
Returns a list of supported formats and the optimal format to be used. imageframeconst.h for a list of format uids.
| IMPORT_C void | InitFrameL | ( | TUid | aFormat, |
| TInt | aFrameNumber, | |||
| TDecodeStreamCaps::TNavigation | aNavigation | |||
| ) | ||||
Initialise the stream.
leave
System wide error if for example the format is not supported.
must call InitFrameL before GetBlocks or GetNextBlocks. Failure to do so completes request with KErrNotReady
| TUid aFormat | the format to use |
| TInt aFrameNumber | frame to stream |
| TDecodeStreamCaps::TNavigation aNavigation | indication to stream of the way that the stream will be navigated. Allows codec to optimise it's behaviour. |
| void | SetExtension | ( | MImageConvExtension * | aExtension | ) | [private] |
| MImageConvExtension * aExtension |