private void removeChannelFromBassMix(IBassAudioChannel channel)
{
Debug.Assert(Handle != 0);
Debug.Assert(channel.Handle != 0);
channel.MixerChannelPaused = BassMix.ChannelHasFlag(channel.Handle, BassFlags.MixerChanPause);
BassMix.MixerRemoveChannel(channel.Handle);
}
/// <summary>
/// Removes a channel from the native BASS mix.
/// </summary>
private void removeChannelFromBassMix(IBassAudioChannel channel)
{
// TODO: This fails and throws unobserved exceptions in github CI runs on macOS.
// Needs further investigation at some point as something is definitely not right.
// Debug.Assert(Handle != 0);
// Debug.Assert(channel.Handle != 0);
channel.MixerChannelPaused = BassMix.ChannelHasFlag(channel.Handle, BassFlags.MixerChanPause);
BassMix.MixerRemoveChannel(channel.Handle);
}
public bool ChannelPause(IBassAudioChannel channel, bool flushMixer = false)
{
bool result = BassMix.ChannelAddFlag(channel.Handle, BassFlags.MixerChanPause);
if (flushMixer)
{
flush();
}
return(result);
}
public bool ChannelPlay(IBassAudioChannel channel, bool restart = false)
{
if (Handle == 0 || channel.Handle == 0)
{
return(false);
}
AddChannelToBassMix(channel);
BassMix.ChannelRemoveFlag(channel.Handle, BassFlags.MixerChanPause);
return(true);
}
public PlaybackState ChannelIsActive(IBassAudioChannel channel)
{
// The audio channel's state tells us whether it's stalled or stopped.
var state = ManagedBass.Bass.ChannelIsActive(channel.Handle);
// The channel is always in a playing state unless stopped or stalled as it's a decoding channel. Retrieve the true playing state from the mixer channel.
if (state == PlaybackState.Playing)
{
state = BassMix.ChannelFlags(channel.Handle, BassFlags.Default, BassFlags.Default).HasFlagFast(BassFlags.MixerChanPause) ? PlaybackState.Paused : state;
}
return(state);
}
public void AddChannelToBassMix(IBassAudioChannel channel)
{
Debug.Assert(Handle != 0);
Debug.Assert(channel.Handle != 0);
BassFlags flags = BassFlags.MixerChanBuffer | BassFlags.MixerChanNoRampin;
if (channel.MixerChannelPaused)
{
flags |= BassFlags.MixerChanPause;
}
if (BassMix.MixerAddChannel(Handle, channel.Handle, flags))
{
activeChannels.Add(channel);
}
}
public bool ChannelSetPosition(IBassAudioChannel channel, long position, PositionFlags mode = PositionFlags.Bytes)
{
// All BASS channels enter a stopped state once they reach the end.
// Non-decoding channels remain in the stopped state when seeked afterwards, however decoding channels are put back into a playing state which causes audio to play.
// Thus, on seek, in order to reproduce the expectations set out by non-decoding channels, manually pause the mixer channel when the decoding channel is stopped.
if (ChannelIsActive(channel) == PlaybackState.Stopped)
{
ChannelPause(channel, true);
}
bool result = BassMix.ChannelSetPosition(channel.Handle, position, mode);
// Perform a flush so that ChannelGetPosition() immediately returns the new value.
flush();
return(result);
}
/// <summary>
/// Adds a channel to the native BASS mix.
/// </summary>
public void AddChannelToBassMix(IBassAudioChannel channel)
{
// TODO: This fails and throws unobserved exceptions in github CI runs on macOS.
// Needs further investigation at some point as something is definitely not right.
// Debug.Assert(Handle != 0);
// Debug.Assert(channel.Handle != 0);
BassFlags flags = BassFlags.MixerChanBuffer | BassFlags.MixerChanNoRampin;
if (channel.MixerChannelPaused)
{
flags |= BassFlags.MixerChanPause;
}
if (BassMix.MixerAddChannel(Handle, channel.Handle, flags))
{
activeChannels.Add(channel);
}
}
public bool StreamFree(IBassAudioChannel channel)
{
Remove(channel, false);
return(ManagedBass.Bass.StreamFree(channel.Handle));
}
public bool ChannelRemoveSync(IBassAudioChannel channel, int sync) => BassMix.ChannelRemoveSync(channel.Handle, sync);
public int ChannelSetSync(IBassAudioChannel channel, SyncFlags type, long parameter, SyncProcedure procedure, IntPtr user = default) => BassMix.ChannelSetSync(channel.Handle, type, parameter, procedure, user);
public int ChannelGetData(IBassAudioChannel channel, float[] buffer, int length) => BassMix.ChannelGetData(channel.Handle, buffer, length);
public bool ChannelGetLevel(IBassAudioChannel channel, [In, Out] float[] levels, float length, LevelRetrievalFlags flags) => BassMix.ChannelGetLevel(channel.Handle, levels, length, flags) != -1;
public long ChannelGetPosition(IBassAudioChannel channel, PositionFlags mode = PositionFlags.Bytes) => BassMix.ChannelGetPosition(channel.Handle);
public BassAmplitudeProcessor(IBassAudioChannel channel)
{
this.channel = channel;
}
