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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 2019 Neil C Smith.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Please visit https://www.neilcsmith.net if you need additional information or
* have any questions.
*
*/
package org.jaudiolibs.audioservers;
import java.nio.FloatBuffer;
import java.util.List;
/**
* The basic interface that will be used by server implementations. This interface
* is deliberately decoupled from any particular audio server implementation. All
* necessary information will be passed from the server in the configure method
* before any call to process().
*
*
* @author Neil C Smith
*/
public interface AudioClient {
/**
* This method will be called by the server implementation prior to any call
* to process(). The supplied AudioConfiguration object provides information on
* sample rate, buffer size, etc. required by the server. An Exception may be
* thrown if the client is unable to be configured to match the requirements of
* the server. The type of the Exception is deliberately unspecified and left to
* the implementation, but will commonly be an IllegalArgumentException or
* IllegalStateException.
* @param context encapsulates information required for configuring the client
* @throws Exception
*/
public void configure(AudioConfiguration context) throws Exception;
/**
* The method that actually processes the audio. The client is provided with
* the time for the current buffer, measured in nanoseconds and relative to
* System.nanotime(). The client should always use the time provided by the
* server.
*
* The server will provide the client with unmodifiable lists of input and
* output audio buffers as FloatBuffers. In the case of there being no input
* channels, a zero length list rather than null will be passed in. Input buffers
* should be treated as read-only.
*
* The server will provide the number of frames of audio in each buffer. The count
* will always be the same across each input and output buffer. If the
* context passed to configure returns true for isFixedBufferSize() then the
* number of frames will always be equal to getMaxBufferSize(). Otherwise, the
* number of frames may be between 1 and getMaxBufferSize().
*
* The client should return a boolean value - true if the audio has been processed
* OK, false to disconnect the client from the server.
*
* @param time
* @param inputs
* @param outputs
* @param nframes
* @return boolean (OK / disconnect)
*/
public boolean process(long time, List inputs,
List outputs, int nframes);
/**
* Signal that the client is being shut down. It is up to implementors of this
* interface whether they allow themselves to be reconfigured ready to process
* audio again.
*/
public void shutdown();
}
