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/*GstAudioFileReaderNativePeer -- GNU Classpath GStreamer AudioFileReader

  native peer class.

 Copyright (C) 2007 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath 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 2, or (at your option)

any later version.

GNU Classpath 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 GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

package gnu.javax.sound.sampled.gstreamer.io;

import gnu.classpath.Pointer;

import gnu.javax.sound.sampled.gstreamer.GStreamerMixer;

import java.io.BufferedInputStream;

import java.io.File;

import java.io.IOException;

import java.io.InputStream;

import java.net.URL;

import java.util.HashMap;

import java.util.Map;

import javax.sound.sampled.AudioFormat;

import javax.sound.sampled.AudioSystem;

import javax.sound.sampled.AudioFormat.Encoding;

/**

 * GStreamer native peer for GstAudioFileReader.

 *

 * @author Mario Torre <neugens@limasoftware.net>

 */

final class GstAudioFileReaderNativePeer

{

  private static final String GST_ENCODING = "GStreamer Generic Audio Reader";

  private static class GstHeader

  {

    /*

     * NOTE: these properties are accessed by the native code, be careful

     * if you change them.

     * Not all the fields are necessarily set.

     *

     */

    public String file = null;

    public String suffix = null;

    public String name = null;

    public String mimetype = null;

    public String endianness = null;

    public String channels = null;

    public String rate = null;

    public String width = null;

    public String depth = null;

    public String isSigned = null;

    public String layer = null;

    public String bitrate = null;

    public String framed = null;

    public String type = null;

  }

  public static AudioFormat getAudioFormat(File file) throws Exception

  {

    GstHeader header = new GstHeader();

    header.file = file.getAbsolutePath();

    if (!gstreamer_get_audio_format_file(header))

      return null;

    return getAudioFormat(header);

  }

  public static AudioFormat getAudioFormat(InputStream is) throws Exception

  {

    return getAudioFormat(is, new GstHeader());

  }

  public static AudioFormat getAudioFormat(URL url) throws Exception

  {

    GstHeader header = new GstHeader();

    header.file = url.toExternalForm();

    return getAudioFormat(url.openStream(), header);

  }

  private static AudioFormat getAudioFormat(InputStream is, GstHeader header)

      throws Exception

  {

    BufferedInputStream stream = new BufferedInputStream(is);

    if(!stream.markSupported())

      throw new IOException("Stream must support marking.");

    stream.mark(0);

    if (!gstreamer_get_audio_format_stream(header, new GstInputStream(stream).

                                           getNativeClass()))

      return null;

    return getAudioFormat(header);

  }

  private static Encoding getEncoding(GstHeader header)

  {

    StringBuilder buffer = new StringBuilder();

    if (header.name == null)

      {

        buffer.append(GST_ENCODING);

        if (header.mimetype != null)

          {

            buffer.append(" ");

            buffer.append(header.mimetype);

          }

        header.name = buffer.toString();

      }

    else

      {

        // strip the "decoder" word from the name, if any

        // this is a bit ugly, the alternative would be to still output the

        // full name of the decoder/demuxer

        String lowerCase = header.name.toLowerCase();

        int index = lowerCase.indexOf("decoder");

        if (index == -1)

          {

            index = lowerCase.indexOf("demuxer");

          }

        if (index == -1)

          index = lowerCase.length();

        buffer.append(header.name.substring(0, index));

      }

    return new Encoding(buffer.toString().trim());

  }

  private static AudioFormat getAudioFormat(GstHeader header)

    throws Exception

  {

    int na = AudioSystem.NOT_SPECIFIED;

    /* we use mimetype as an header, but this could have some side effects */

    Encoding encoding = getEncoding(header);

    float sampleRate = ((header.rate != null) ?

                         new Float(header.rate).floatValue() : na);

    int sampleSizeInBits = ((header.depth != null) ?

                             new Integer(header.depth).intValue() : na);

    int channels = ((header.channels != null) ?

                     new Integer(header.channels).intValue() : na);

    boolean bigEndian = false;

    if (header.endianness != null)

      {

        if (header.endianness.compareTo("4321") == 0)

          bigEndian = true;

      }

    String ext = null;

    int frameSize = na;

    float frameRate = na;

    String lowerCase = header.name.toLowerCase();

    // FIXME: frameRate = sampleRate in these cases under all the tests so far

    // but I'm not sure if this is always correct...

    if (lowerCase.contains("law") || lowerCase.contains("au"))

      {

        frameSize = (sampleSizeInBits >> 3) * channels;

        frameRate = sampleRate;

        ext = "au";

      }

    else if (lowerCase.contains("wav"))

      {

        frameSize = ((sampleSizeInBits + 7) / 8) * channels;

        frameRate = sampleRate;

        ext = "wav";

      }

    else if (lowerCase.contains("iff"))

      {

        frameSize = (sampleSizeInBits * channels) / 8;

        frameRate = sampleRate;

        ext = "aiff";

      }

    // write all the additional properties we got to identify

    // the gstreamer plugin actually used to deal with this stream

    Map<String, Object> properties = new HashMap<String, Object>();

    properties.put(GStreamerMixer.GST_BACKEND, true);

    properties.put(GStreamerMixer.GST_DECODER, header.name);

    properties.put(GStreamerMixer.GST_TYPE_NAME, encoding.toString());

    if (ext != null)

      properties.put(GStreamerMixer.GST_FILE_EXTENSION, ext);

    /* now we put in some of the additional properties if we have them */

    if (header.type != null) properties.put("type", header.type);

    if (header.framed != null) properties.put("framed", header.framed);

    if (header.bitrate != null) properties.put("bitrate", header.bitrate);

    if (header.isSigned != null) properties.put("isSigned", header.isSigned);

    if (header.depth != null) properties.put("depth", header.depth);

    if (header.mimetype != null) properties.put("mimetype", header.mimetype);

    AudioFormat format = new AudioFormat(encoding,

                                         sampleRate,

                                         sampleSizeInBits,

                                         channels,

                                         frameSize,

                                         frameRate,

                                         bigEndian,

                                         properties);

    return format;

  }

  /* ***** native methods ***** */

  /**

   * Retrieve header information about the stream being played.

   */

  native static final

  protected boolean gstreamer_get_audio_format_stream(GstHeader info,

                                                      Pointer pointer);

  /**

   * Retrieve header information about the file being played.

   */

  native static final

  protected boolean gstreamer_get_audio_format_file(GstHeader info);

  /**

   * Initialize the native peer and enables the object cache.

   * It is meant to be used by the static initializer.

   */

  native private static final void init_id_cache();

  static

  {

    System.loadLibrary("gstreamerpeer"); //$NON-NLS-1$

    init_id_cache();

  }

}