BASS.NET API for the Un4seen BASS Audio LibraryBassWmaBASS_WMA_EncodeSetTag Method (Int32, String, IntPtr, Int32)BASS.NET API for the Un4seen BASS Audio Library
Sets a binary tag in a WMA encoding.

Namespace: Un4seen.Bass.AddOn.Wma
Assembly: Bass.Net (in Bass.Net.dll) Version: 2.4.12.0
Syntax

public static bool BASS_WMA_EncodeSetTag(
	int handle,
	string tag,
	IntPtr value,
	int length
)

Parameters

handle
Type: SystemInt32
The encoder handle.
tag
Type: SystemString
The tag to set (e.g. "WM/Picture").
value
Type: SystemIntPtr
The pointer to the binary tag's data.
length
Type: SystemInt32
The number of bytes provided as binary data in the tag.

Return Value

Type: Boolean
If succesful, is returned, else is returned. Use BASS_ErrorGetCode to get the error code.
Remarks

Where the tags are located in the encoded stream depends on when this function is used. Calling this function before beginning encoding data puts the tags in the stream's header. Calling this function after encoding has begun puts the tags in the actual stream data, at the current encoding position.

Header tags must be set before encoding any data - no more header tags can be set once BASS_WMA_EncodeWrite(Int32, IntPtr, Int32) has been called.

To set tags mid-stream (after encoding has begun), the BASS_WMA_ENCODE_SCRIPT flag needs to have been specified in the encoder's creation. A mid-stream tag typically used is "Caption", which get's displayed in Windows Media Player 9 and above (if the user has enabled captions).

When using a network encoder, it should be noted that while all header tags are sent to newly connecting clients, prior mid-stream tags are not. So if, for example, you're using the "Caption" tag to indicate the current song title, it should be sent at fairly regular intervals (not only at the start of the song).

On the playback side, mid-stream tags can be processed using BASS_ChannelSetSync(Int32, BASSSync, Int64, SYNCPROC, IntPtr) (with BASS_SYNC_META).

ERROR CODEDescription
BASS_ERROR_HANDLEhandle is not valid.
BASS_ERROR_NOTAVAILThe encoder does not have mid-stream tags enabled, so tags can not be set once encoding has begun.
BASS_ERROR_ILLPARAMtag and/or value is invalid.
BASS_ERROR_UNKNOWNSome other mystery problem!

See Also

Reference