IPMT::GetTableDescriptorByTag method (mpeg2psiparser.h)
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The GetTableDescriptorByTag method searches the PMT for a table-wide descriptor with the specified descriptor tag.
Syntax
HRESULT GetTableDescriptorByTag(
[in] BYTE bTag,
[in, out] DWORD *pdwCookie,
[out] IGenericDescriptor **ppDescriptor
);
Parameters
[in] bTag
Specifies the descriptor tag for which to search.
[in, out] pdwCookie
Pointer to a variable that specifies the start position in the descriptor list. This parameter is optional. If the value of pdwCookie is NULL, the search starts from the first descriptor in the list. Otherwise, the search starts from the position given in pdwCookie. When the method returns, the pdwCookie parameter contains the position of the next matching descriptor, if any. You can use this parameter to iterate through the descriptor list, looking for every instance of a particular descriptor tag.
[out] ppDescriptor
Address of a variable that receives an IGenericDescriptor interface pointer. Use this interface to retrieve the information in the descriptor. The caller must release the interface.
Return value
The method returns an HRESULT. Possible values include those in the following table.
| Return code | Description |
|---|---|
|
Index out of bounds. |
|
The specified tag was not found. |
|
The record contains at least one more descriptor with this tag. |
|
The record does not contain any more descriptors with this tag. |
|
The method succeeded. |
Remarks
If the value of pdwCookie is not NULL, the method returns either MPEG2_S_NO_MORE_DATA_AVAILABLE or MPEG2_S_MORE_DATA_AVAILABLE to indicate whether the MGT contains additional tags that match the search criteria.
Requirements
| Requirement | Value |
|---|---|
| Target Platform | Windows |
| Header | mpeg2psiparser.h |