BASS.NET API for the Un4seen BASS Audio Library

BassBASS_ChannelGetLength Method (Int32, BASSMode)

BASS.NET API for the Un4seen BASS Audio Library
Retrieves the playback length of a channel.

Namespace:  Un4seen.Bass
Assembly:  Bass.Net (in Bass.Net.dll) Version:

public static long BASS_ChannelGetLength(
	int handle,
	BASSMode mode


Type: SystemInt32
The channel handle... a HCHANNEL, HMUSIC, HSTREAM. HSAMPLE handles may also be used.
Type: Un4seen.BassBASSMode
How to retrieve the length (one of the BASSMode flags):
BASS_POS_BYTEGet the length in bytes.
BASS_POS_MUSIC_ORDERGet the length in orders. (HMUSIC only).
BASS_POS_OGGGet the number of bitstreams in an OGG file.
Other modes may be supported by add-ons, see the documentation.

Return Value

Type: Int64
If succesful, then the channel's length is returned, else -1 is returned. Use BASS_ErrorGetCode to get the error code.

The exact length of a stream will be returned once the whole file has been streamed, but until then it is not always possible to 100% accurately estimate the length. The length is always exact for MP3/MP2/MP1 files when the BASS_STREAM_PRESCAN flag is used in the BASS_StreamCreateFile(String, Int64, Int64, BASSFlag) call, otherwise it is an (usually accurate) estimation based on the file size. The length returned for OGG files will usually be exact (assuming the file is not corrupt), but when streaming from the internet (or "buffered" user file), it can be a very rough estimation until the whole file has been downloaded. It will also be an estimate for chained OGG files that are not pre-scanned.

Unless an OGG file contains a single bitstream, the number of bitstreams it contains will only be available if it was pre-scanned at the stream's creation.

Retrieving the length of a MOD music requires that the BASS_MUSIC_PRESCAN flag was used in the BASS_MusicLoad(String, Int64, Int32, BASSFlag, Int32) call.

ERROR CODEDescription
BASS_ERROR_HANDLEhandle is not a valid channel.
BASS_ERROR_NOTAVAILThe length is not available.


Get the duration (in seconds) of a channel:
// length in bytes
long len = Bass.BASS_ChannelGetLength(channel, BASSMode.BASS_POS_BYTE);
// the time length
double time = Bass.BASS_ChannelBytes2Seconds(channel, len);
See Also