/** Map types from OMX standard types only here so interface is as generic as possible. */ typedef OMX_U32 CPresult; typedefchar * CPstring; typedefvoid * CPhandle; typedef OMX_U32 CPuint; typedef OMX_S32 CPint; typedefchar CPbyte; typedef OMX_BOOL CPbool;
/** enumeration of origin types used in the CP_PIPETYPE's Seek function *@ingroupcp
*/ typedefenum CP_ORIGINTYPE {
CP_OriginBegin,
CP_OriginCur,
CP_OriginEnd,
CP_OriginKhronosExtensions = 0x6F000000, /**< Reserved region for introducing Khronos Standard Extensions */
CP_OriginVendorStartUnused = 0x7F000000, /**< Reserved region for introducing Vendor Extensions */
CP_OriginMax = 0X7FFFFFFF
} CP_ORIGINTYPE;
/** enumeration of contact access types used in the CP_PIPETYPE's Open function *@ingroupcp
*/ typedefenum CP_ACCESSTYPE {
CP_AccessRead,
CP_AccessWrite,
CP_AccessReadWrite ,
CP_AccessKhronosExtensions = 0x6F000000, /**< Reserved region for introducing Khronos Standard Extensions */
CP_AccessVendorStartUnused = 0x7F000000, /**< Reserved region for introducing Vendor Extensions */
CP_AccessMax = 0X7FFFFFFF
} CP_ACCESSTYPE;
/** enumeration of results returned by the CP_PIPETYPE's CheckAvailableBytes function *@ingroupcp
*/ typedefenum CP_CHECKBYTESRESULTTYPE
{
CP_CheckBytesOk, /**< There are at least the request number
of bytes available */
CP_CheckBytesNotReady, /**< The pipe is still retrieving bytes andpresentlylackssufficientbytes. Clientwillbecalledwhentheyare
sufficient bytes are available. */
CP_CheckBytesInsufficientBytes , /**< The pipe has retrieved all bytes butthoseavailablearelessthanthose
requested */
CP_CheckBytesAtEndOfStream, /**< The pipe has reached the end of stream
and no more bytes are available. */
CP_CheckBytesOutOfBuffers, /**< All read/write buffers are currently in use. */
CP_CheckBytesKhronosExtensions = 0x6F000000, /**< Reserved region for introducing Khronos Standard Extensions */
CP_CheckBytesVendorStartUnused = 0x7F000000, /**< Reserved region for introducing Vendor Extensions */
CP_CheckBytesMax = 0X7FFFFFFF
} CP_CHECKBYTESRESULTTYPE;
/** enumeration of content pipe events sent to the client callback. *@ingroupcp
*/ typedefenum CP_EVENTTYPE{
CP_BytesAvailable, /** bytes requested in a CheckAvailableBytes call are now available*/
CP_Overflow, /** enumeration of content pipe events sent to the client callback*/
CP_PipeDisconnected , /** enumeration of content pipe events sent to the client callback*/
CP_EventKhronosExtensions = 0x6F000000, /**< Reserved region for introducing Khronos Standard Extensions */
CP_EventVendorStartUnused = 0x7F000000, /**< Reserved region for introducing Vendor Extensions */
CP_EventMax = 0X7FFFFFFF
} CP_EVENTTYPE;
/** content pipe definition *@ingroupcp
*/ typedefstruct CP_PIPETYPE
{ /** Open a content stream for reading or writing. */
CPresult (*Open)( CPhandle* hContent, CPstring szURI, CP_ACCESSTYPE eAccess );
/** Close a content stream. */
CPresult (*Close)( CPhandle hContent );
/** Create a content source and open it for writing. */
CPresult (*Create)( CPhandle *hContent, CPstring szURI );
/** Check the that specified number of bytes are available for reading or writing (depending on access type).*/
CPresult (*CheckAvailableBytes)( CPhandle hContent, CPuint nBytesRequested, CP_CHECKBYTESRESULTTYPE *eResult );
/** Seek to certain position in the content relative to the specified origin. */
CPresult (*SetPosition)( CPhandle hContent, CPint nOffset, CP_ORIGINTYPE eOrigin);
/** Retrieve the current position relative to the start of the content. */
CPresult (*GetPosition)( CPhandle hContent, CPuint *pPosition);
/** Retrieve data of the specified size from the content stream (advance content pointer by size of data).
Note: pipe client provides pointer. This function is appropriate for small high frequency reads. */
CPresult (*Read)( CPhandle hContent, CPbyte *pData, CPuint nSize);
/** Retrieve a buffer allocated by the pipe that contains the requested number of bytes. Buffercontainsthenextblockofbytes,asspecifiedbynSize,ofthecontent.nSizealso returnsthesizeoftheblockactuallyread.Contentpointeradvancesthebythereturnedsize. Note:pipeprovidespointer.Thisfunctionisappropriateforlargereads.Theclientmustcall ReleaseReadBufferwhendonewithbuffer.
Insomecasestherequestedblockmaynotresideincontiguousmemorywithinthe pipeimplementation.Forinstanceifthepipeleveragesacircularbufferthentherequested blockmaystraddletheboundaryofthecircularbuffer.Bydefaultapipeimplementation performsacopyinthiscasetoprovidetheblocktothepipeclientinonecontiguousbuffer. If,however,theclientsetsbForbidCopy,thenthepipereturnsonlythosebytesprecedingthememory
boundary. Here the client may retrieve the data in segments over successive calls. */
CPresult (*ReadBuffer)( CPhandle hContent, CPbyte **ppBuffer, CPuint *nSize, CPbool bForbidCopy);
/** Release a buffer obtained by ReadBuffer back to the pipe. */
CPresult (*ReleaseReadBuffer)(CPhandle hContent, CPbyte *pBuffer);
/** Write data of the specified size to the content (advance content pointer by size of data).
Note: pipe client provides pointer. This function is appropriate for small high frequency writes. */
CPresult (*Write)( CPhandle hContent, CPbyte *data, CPuint nSize);
/** Retrieve a buffer allocated by the pipe used to write data to the content. Clientwillfillbufferwithoutputdata.Note:pipeprovidespointer.Thisfunctionisappropriate
for large writes. The client must call WriteBuffer when done it has filled the buffer with data.*/
CPresult (*GetWriteBuffer)( CPhandle hContent, CPbyte **ppBuffer, CPuint nSize);
/** Deliver a buffer obtained via GetWriteBuffer to the pipe. Pipe will write the
the contents of the buffer to content and advance content pointer by the size of the buffer */
CPresult (*WriteBuffer)( CPhandle hContent, CPbyte *pBuffer, CPuint nFilledSize);
/** Register a per-handle client callback with the content pipe. */
CPresult (*RegisterCallback)( CPhandle hContent, CPresult (*ClientCallback)(CP_EVENTTYPE eEvent, CPuint iParam));
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