/*

 * Copyright (c) 1999, 2016, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package com.sun.media.sound;

import java.applet.AudioClip;

import java.io.BufferedInputStream;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.InputStream;

import javax.sound.midi.InvalidMidiDataException;

import javax.sound.midi.MetaEventListener;

import javax.sound.midi.MetaMessage;

import javax.sound.midi.MidiFileFormat;

import javax.sound.midi.MidiSystem;

import javax.sound.midi.MidiUnavailableException;

import javax.sound.midi.Sequence;

import javax.sound.midi.Sequencer;

import javax.sound.sampled.AudioFormat;

import javax.sound.sampled.AudioInputStream;

import javax.sound.sampled.AudioSystem;

import javax.sound.sampled.Clip;

import javax.sound.sampled.DataLine;

import javax.sound.sampled.LineEvent;

import javax.sound.sampled.LineListener;

import javax.sound.sampled.SourceDataLine;

import javax.sound.sampled.UnsupportedAudioFileException;

/**

 * Java Sound audio clip;

 *

 * @author Arthur van Hoff, Kara Kytle, Jan Borgersen

 * @author Florian Bomers

 */

public final class JavaSoundAudioClip implements AudioClip, MetaEventListener, LineListener {

    private static final boolean DEBUG = false;

    private static final int BUFFER_SIZE = 16384; // number of bytes written each time to the source data line

    private long lastPlayCall = 0;

    private static final int MINIMUM_PLAY_DELAY = 30;

    private byte loadedAudio[] = null;

    private int loadedAudioByteLength = 0;

    private AudioFormat loadedAudioFormat = null;

    private AutoClosingClip clip = null;

    private boolean clipLooping = false;

    private DataPusher datapusher = null;

    private Sequencer sequencer = null;

    private Sequence sequence = null;

    private boolean sequencerloop = false;

    /**

     * used for determining how many samples is the

     * threshhold between playing as a Clip and streaming

     * from the file.

     *

     * $$jb: 11.07.99: the engine has a limit of 1M

     * samples to play as a Clip, so compare this number

     * with the number of samples in the stream.

     *

     */

    private static final long CLIP_THRESHOLD = 1048576;

    //private final static long CLIP_THRESHOLD = 1;

    private static final int STREAM_BUFFER_SIZE = 1024;

    public JavaSoundAudioClip(InputStream in) throws IOException {

        if (DEBUG || Printer.debug)Printer.debug("JavaSoundAudioClip.<init>");

        BufferedInputStream bis = new BufferedInputStream(in, STREAM_BUFFER_SIZE);

        bis.mark(STREAM_BUFFER_SIZE);

        boolean success = false;

        try {

            AudioInputStream as = AudioSystem.getAudioInputStream(bis);

            // load the stream data into memory

            success = loadAudioData(as);

            if (success) {

                success = false;

                if (loadedAudioByteLength < CLIP_THRESHOLD) {

                    success = createClip();

                }

                if (!success) {

                    success = createSourceDataLine();

                }

            }

        } catch (UnsupportedAudioFileException e) {

            // not an audio file

            try {

                MidiFileFormat mff = MidiSystem.getMidiFileFormat(bis);

                success = createSequencer(bis);

            } catch (InvalidMidiDataException e1) {

                success = false;

            }

        }

        if (!success) {

            throw new IOException("Unable to create AudioClip from input stream");

        }

    }

    @Override

    public synchronized void play() {

        startImpl(false);

    }

    @Override

    public synchronized void loop() {

        startImpl(true);

    }

    private synchronized void startImpl(boolean loop) {

        // hack for some applets that call the start method very rapidly...

        long currentTime = System.currentTimeMillis();

        long diff = currentTime - lastPlayCall;

        if (diff < MINIMUM_PLAY_DELAY) {

            if (DEBUG || Printer.debug) Printer.debug("JavaSoundAudioClip.startImpl(loop="+loop+"): abort - too rapdly");

            return;

        }

        lastPlayCall = currentTime;

        if (DEBUG || Printer.debug) Printer.debug("JavaSoundAudioClip.startImpl(loop="+loop+")");

        try {

            if (clip != null) {

                if (!clip.isOpen()) {

                    if (DEBUG || Printer.trace)Printer.trace("JavaSoundAudioClip: clip.open()");

                    clip.open(loadedAudioFormat, loadedAudio, 0, loadedAudioByteLength);

                } else {

                    if (DEBUG || Printer.trace)Printer.trace("JavaSoundAudioClip: clip.flush()");

                    clip.flush();

                    if (loop != clipLooping) {

                        // need to stop in case the looped status changed

                        if (DEBUG || Printer.trace)Printer.trace("JavaSoundAudioClip: clip.stop()");

                        clip.stop();

                    }

                }

                clip.setFramePosition(0);

                if (loop) {

                    if (DEBUG || Printer.trace)Printer.trace("JavaSoundAudioClip: clip.loop()");

                    clip.loop(Clip.LOOP_CONTINUOUSLY);

                } else {

                    if (DEBUG || Printer.trace)Printer.trace("JavaSoundAudioClip: clip.start()");

                    clip.start();

                }

                clipLooping = loop;

                if (DEBUG || Printer.debug)Printer.debug("Clip should be playing/looping");

            } else if (datapusher != null ) {

                datapusher.start(loop);

                if (DEBUG || Printer.debug)Printer.debug("Stream should be playing/looping");

            } else if (sequencer != null) {

                sequencerloop = loop;

                if (sequencer.isRunning()) {

                    sequencer.setMicrosecondPosition(0);

                }

                if (!sequencer.isOpen()) {

                    try {

                        sequencer.open();

                        sequencer.setSequence(sequence);

                    } catch (InvalidMidiDataException e1) {

                        if (DEBUG || Printer.err)e1.printStackTrace();

                    } catch (MidiUnavailableException e2) {

                        if (DEBUG || Printer.err)e2.printStackTrace();

                    }

                }

                sequencer.addMetaEventListener(this);

                try {

                    sequencer.start();

                } catch (Exception e) {

                    if (DEBUG || Printer.err) e.printStackTrace();

                }

                if (DEBUG || Printer.debug)Printer.debug("Sequencer should be playing/looping");

            }

        } catch (Exception e) {

            if (DEBUG || Printer.err)e.printStackTrace();

        }

    }

    @Override

    public synchronized void stop() {

        if (DEBUG || Printer.debug)Printer.debug("JavaSoundAudioClip->stop()");

        lastPlayCall = 0;

        if (clip != null) {

            try {

                if (DEBUG || Printer.trace)Printer.trace("JavaSoundAudioClip: clip.flush()");

                clip.flush();

            } catch (Exception e1) {

                if (Printer.err) e1.printStackTrace();

            }

            try {

                if (DEBUG || Printer.trace)Printer.trace("JavaSoundAudioClip: clip.stop()");

                clip.stop();

            } catch (Exception e2) {

                if (Printer.err) e2.printStackTrace();

            }

            if (DEBUG || Printer.debug)Printer.debug("Clip should be stopped");

        } else if (datapusher != null) {

            datapusher.stop();

            if (DEBUG || Printer.debug)Printer.debug("Stream should be stopped");

        } else if (sequencer != null) {

            try {

                sequencerloop = false;

                sequencer.removeMetaEventListener(this);

                sequencer.stop();

            } catch (Exception e3) {

                if (Printer.err) e3.printStackTrace();

            }

            try {

                sequencer.close();

            } catch (Exception e4) {

                if (Printer.err) e4.printStackTrace();

            }

            if (DEBUG || Printer.debug)Printer.debug("Sequencer should be stopped");

        }

    }

    // Event handlers (for debugging)

    @Override

    public synchronized void update(LineEvent event) {

        if (DEBUG || Printer.debug) Printer.debug("line event received: "+event);

    }

    // handle MIDI track end meta events for looping

    @Override

    public synchronized void meta(MetaMessage message) {

        if (DEBUG || Printer.debug)Printer.debug("META EVENT RECEIVED!!!!! ");

        if( message.getType() == 47 ) {

            if (sequencerloop){

                //notifyAll();

                sequencer.setMicrosecondPosition(0);

                loop();

            } else {

                stop();

            }

        }

    }

    @Override

    public String toString() {

        return getClass().toString();

    }

    @Override

    protected void finalize() {

        if (clip != null) {

            if (DEBUG || Printer.trace)Printer.trace("JavaSoundAudioClip.finalize: clip.close()");

            clip.close();

        }

        //$$fb 2001-09-26: may improve situation related to bug #4302884

        if (datapusher != null) {

            datapusher.close();

        }

        if (sequencer != null) {

            sequencer.close();

        }

    }

    // FILE LOADING METHODS

    private boolean loadAudioData(AudioInputStream as)  throws IOException, UnsupportedAudioFileException {

        if (DEBUG || Printer.debug)Printer.debug("JavaSoundAudioClip->openAsClip()");

        // first possibly convert this stream to PCM

        as = Toolkit.getPCMConvertedAudioInputStream(as);

        if (as == null) {

            return false;

        }

        loadedAudioFormat = as.getFormat();

        long frameLen = as.getFrameLength();

        int frameSize = loadedAudioFormat.getFrameSize();

        long byteLen = AudioSystem.NOT_SPECIFIED;

        if (frameLen != AudioSystem.NOT_SPECIFIED

            && frameLen > 0

            && frameSize != AudioSystem.NOT_SPECIFIED

            && frameSize > 0) {

            byteLen = frameLen * frameSize;

        }

        if (byteLen != AudioSystem.NOT_SPECIFIED) {

            // if the stream length is known, it can be efficiently loaded into memory

            readStream(as, byteLen);

        } else {

            // otherwise we use a ByteArrayOutputStream to load it into memory

            readStream(as);

        }

        // if everything went fine, we have now the audio data in

        // loadedAudio, and the byte length in loadedAudioByteLength

        return true;

    }

    private void readStream(AudioInputStream as, long byteLen) throws IOException {

        // arrays "only" max. 2GB

        int intLen;

        if (byteLen > 2147483647) {

            intLen = 2147483647;

        } else {

            intLen = (int) byteLen;

        }

        loadedAudio = new byte[intLen];

        loadedAudioByteLength = 0;

        // this loop may throw an IOException

        while (true) {

            int bytesRead = as.read(loadedAudio, loadedAudioByteLength, intLen - loadedAudioByteLength);

            if (bytesRead <= 0) {

                as.close();

                break;

            }

            loadedAudioByteLength += bytesRead;

        }

    }

    private void readStream(AudioInputStream as) throws IOException {

        DirectBAOS baos = new DirectBAOS();

        byte buffer[] = new byte[16384];

        int bytesRead = 0;

        int totalBytesRead = 0;

        // this loop may throw an IOException

        while( true ) {

            bytesRead = as.read(buffer, 0, buffer.length);

            if (bytesRead <= 0) {

                as.close();

                break;

            }

            totalBytesRead += bytesRead;

            baos.write(buffer, 0, bytesRead);

        }

        loadedAudio = baos.getInternalBuffer();

        loadedAudioByteLength = totalBytesRead;

    }

    // METHODS FOR CREATING THE DEVICE

    private boolean createClip() {

        if (DEBUG || Printer.debug)Printer.debug("JavaSoundAudioClip.createClip()");

        try {

            DataLine.Info info = new DataLine.Info(Clip.class, loadedAudioFormat);

            if (!(AudioSystem.isLineSupported(info)) ) {

                if (DEBUG || Printer.err)Printer.err("Clip not supported: "+loadedAudioFormat);

                // fail silently

                return false;

            }

            Object line = AudioSystem.getLine(info);

            if (!(line instanceof AutoClosingClip)) {

                if (DEBUG || Printer.err)Printer.err("Clip is not auto closing!"+clip);

                // fail -> will try with SourceDataLine

                return false;

            }

            clip = (AutoClosingClip) line;

            clip.setAutoClosing(true);

            if (DEBUG || Printer.debug) clip.addLineListener(this);

        } catch (Exception e) {

            if (DEBUG || Printer.err)e.printStackTrace();

            // fail silently

            return false;

        }

        if (clip==null) {

            // fail silently

            return false;

        }

        if (DEBUG || Printer.debug)Printer.debug("Loaded clip.");

        return true;

    }

    private boolean createSourceDataLine() {

        if (DEBUG || Printer.debug)Printer.debug("JavaSoundAudioClip.createSourceDataLine()");

        try {

            DataLine.Info info = new DataLine.Info(SourceDataLine.class, loadedAudioFormat);

            if (!(AudioSystem.isLineSupported(info)) ) {

                if (DEBUG || Printer.err)Printer.err("Line not supported: "+loadedAudioFormat);

                // fail silently

                return false;

            }

            SourceDataLine source = (SourceDataLine) AudioSystem.getLine(info);

            datapusher = new DataPusher(source, loadedAudioFormat, loadedAudio, loadedAudioByteLength);

        } catch (Exception e) {

            if (DEBUG || Printer.err)e.printStackTrace();

            // fail silently

            return false;

        }

        if (datapusher==null) {

            // fail silently

            return false;

        }

        if (DEBUG || Printer.debug)Printer.debug("Created SourceDataLine.");

        return true;

    }

    private boolean createSequencer(BufferedInputStream in) throws IOException {

        if (DEBUG || Printer.debug)Printer.debug("JavaSoundAudioClip.createSequencer()");

        // get the sequencer

        try {

            sequencer = MidiSystem.getSequencer( );

        } catch(MidiUnavailableException me) {

            if (DEBUG || Printer.err)me.printStackTrace();

            return false;

        }

        if (sequencer==null) {

            return false;

        }

        try {

            sequence = MidiSystem.getSequence(in);

            if (sequence == null) {

                return false;

            }

        } catch (InvalidMidiDataException e) {

            if (DEBUG || Printer.err)e.printStackTrace();

            return false;

        }

        if (DEBUG || Printer.debug)Printer.debug("Created Sequencer.");

        return true;

    }

    /*

     * private inner class representing a ByteArrayOutputStream

     * which allows retrieval of the internal array

     */

    private static class DirectBAOS extends ByteArrayOutputStream {

        DirectBAOS() {

            super();

        }

        public byte[] getInternalBuffer() {

            return buf;

        }

    } // class DirectBAOS

}