BASS

BASS_ChannelFlags

Modifies and retrieves a channel's flags.

DWORD BASS_ChannelFlags(
    DWORD handle,
    DWORD flags,
    DWORD mask
);

Parameters

handle

The channel handle... a HCHANNEL, HMUSIC, HSTREAM.

flags

A combination of these flags.


BASS_SAMPLE_LOOP	Loop the channel.

BASS_STREAM_AUTOFREE	Automatically free the channel when playback ends. Note that the BASS_MUSIC_AUTOFREE flag is identical to this flag. (HSTREAM/HMUSIC only)
BASS_STREAM_RESTRATE	Restrict the download rate. (HSTREAM)
BASS_MUSIC_NONINTER	Use non-interpolated sample mixing. (HMUSIC)
BASS_MUSIC_SINCINTER	Use sinc interpolated sample mixing. (HMUSIC)
BASS_MUSIC_RAMP	Use "normal" ramping. (HMUSIC)
BASS_MUSIC_RAMPS	Use "sensitive" ramping. (HMUSIC)
BASS_MUSIC_SURROUND	Use surround sound. (HMUSIC)
BASS_MUSIC_SURROUND2	Use surround sound mode 2. (HMUSIC)
BASS_MUSIC_FT2MOD	Use FastTracker 2 .MOD playback. (HMUSIC)
BASS_MUSIC_PT1MOD	Use ProTracker 1 .MOD playback. (HMUSIC)
BASS_MUSIC_POSRESET	Stop all notes when seeking. (HMUSIC)
BASS_MUSIC_POSRESETEX	Stop all notes and reset BPM/etc when seeking. (HMUSIC)
BASS_MUSIC_STOPBACK	Stop when a backward jump effect is played. (HMUSIC)
BASS_SPEAKER_xxx	Speaker assignment flags. (HSTREAM/HMUSIC)

other flags may be supported by add-ons, see the documentation.

mask

The flags (as above) to modify. Flags that are not included in this are left as they are, so it can be set to 0 in order to just retrieve the current flags. To modify the speaker flags, any of the BASS_SPEAKER_xxx flags can be used in the mask (no need to include all of them).

Return value

If successful, the channel's updated flags are returned, else -1 is returned. Use BASS_ErrorGetCode to get the error code.

Error codes

BASS_ERROR_HANDLE

handle is not a valid channel.

Remarks

Some flags may not be adjustable in some circumstances, so the return value should be checked to confirm any changes. The flags listed above are just the flags that can be modified, and there may be additional flags present in the return value. See the BASS_CHANNELINFO documentation for a full list of flags.

Streams that are created by add-ons may have additional flags available. There is a limited number of possible flag values though, so some add-ons may use the same flag value for different things. This means that when using add-on specific flags with a stream created via the plugin system, it is a good idea to first confirm that the add-on is handling the stream, by checking its ctype via BASS_ChannelGetInfo.

During playback, the effects of flag changes are not heard instantaneously, due to buffering. To reduce the delay, use the BASS_CONFIG_BUFFER config option to reduce the buffer length.

Example

Toggle looping on a channel.

if (BASS_ChannelFlags(channel, 0, 0)&BASS;_SAMPLE_LOOP) { // looping is enabled, so...
    BASS_ChannelFlags(channel, 0, BASS_SAMPLE_LOOP); // remove the LOOP flag
} else { // looping is disabled, so...
    BASS_ChannelFlags(channel, BASS_SAMPLE_LOOP, BASS_SAMPLE_LOOP); // set the LOOP flag
}