mirror of
https://github.com/DSheirer/sdrtrunk.git
synced 2026-11-11 08:07:24 -05:00
83 lines
2.4 KiB
Java
83 lines
2.4 KiB
Java
/*
|
|
* *****************************************************************************
|
|
* Copyright (C) 2014-2026 Dennis Sheirer
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>
|
|
* ****************************************************************************
|
|
*/
|
|
|
|
package io.github.dsheirer.audio.playback;
|
|
|
|
import io.github.dsheirer.audio.AudioEvent;
|
|
import java.nio.ByteBuffer;
|
|
import java.util.List;
|
|
|
|
import javax.sound.sampled.AudioFormat;
|
|
|
|
/**
|
|
* Abstract audio provider implementation
|
|
*/
|
|
public abstract class AudioProvider
|
|
{
|
|
/**
|
|
* Converts the audio sample to a 16-bit PCM sample, limiting out of range values instead of allowing them to wrap.
|
|
* @param sample in range -1.0 to 1.0
|
|
* @return PCM sample
|
|
*/
|
|
protected static short toPcm(float sample)
|
|
{
|
|
return (short)(Math.clamp(sample, -1.0f, 1.0f) * Short.MAX_VALUE);
|
|
}
|
|
|
|
/**
|
|
* Audio format for this provider
|
|
*/
|
|
public abstract AudioFormat getAudioFormat();
|
|
|
|
/**
|
|
* Provide a non-null, 160-sample/20-millisecond buffer of audio at 8 kHz
|
|
* @return audio buffer
|
|
*/
|
|
public abstract ByteBuffer getAudio();
|
|
|
|
/**
|
|
* Provides access to the audio channels for this provider
|
|
* @return list of audio channels
|
|
*/
|
|
public abstract List<AudioChannel> getAudioChannels();
|
|
|
|
/**
|
|
* Notifies audio event listener(s) of the event
|
|
* @param eventType to broadcast
|
|
*/
|
|
public void notify(AudioEvent.Type eventType)
|
|
{
|
|
for(AudioChannel audioChannel : getAudioChannels())
|
|
{
|
|
audioChannel.notify(eventType);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Disposes the audio channel to prepare for audio output changes or shutdown.
|
|
*/
|
|
public void dispose()
|
|
{
|
|
for(AudioChannel audioChannel: getAudioChannels())
|
|
{
|
|
audioChannel.dispose();
|
|
}
|
|
}
|
|
}
|