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13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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15  * accompanied this code).
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25 
26 package com.sun.media.sound;
27 
28 import java.io.IOException;
29 import java.io.InputStream;
30 
31 import javax.sound.sampled.AudioFileFormat;
32 import javax.sound.sampled.AudioFormat;
33 import javax.sound.sampled.AudioFormat.Encoding;
34 import javax.sound.sampled.AudioInputStream;
35 import javax.sound.sampled.UnsupportedAudioFileException;
36 
37 /**
38  * Floating-point encoded (format 3) WAVE file loader.
39  *
40  * @author Karl Helgason
41  */
42 public final class WaveFloatFileReader extends SunFileReader {
43 
44     @Override
getAudioFileFormatImpl(final InputStream stream)45     StandardFileFormat getAudioFileFormatImpl(final InputStream stream)
46             throws UnsupportedAudioFileException, IOException {
47 
48         RIFFReader riffiterator = new RIFFReader(stream);
49         if (!riffiterator.getFormat().equals("RIFF"))
50             throw new UnsupportedAudioFileException();
51         if (!riffiterator.getType().equals("WAVE"))
52             throw new UnsupportedAudioFileException();
53 
54         boolean fmt_found = false;
55         boolean data_found = false;
56 
57         int channels = 1;
58         long samplerate = 1;
59         int framesize = 1;
60         int bits = 1;
61         long dataSize = 0;
62 
63         while (riffiterator.hasNextChunk()) {
64             RIFFReader chunk = riffiterator.nextChunk();
65             if (chunk.getFormat().equals("fmt ")) {
66                 fmt_found = true;
67 
68                 int format = chunk.readUnsignedShort();
69                 if (format != WaveFileFormat.WAVE_FORMAT_IEEE_FLOAT) {
70                     throw new UnsupportedAudioFileException();
71                 }
72                 channels = chunk.readUnsignedShort();
73                 samplerate = chunk.readUnsignedInt();
74                 /* framerate = */chunk.readUnsignedInt();
75                 framesize = chunk.readUnsignedShort();
76                 bits = chunk.readUnsignedShort();
77             }
78             if (chunk.getFormat().equals("data")) {
79                 dataSize = chunk.getSize();
80                 data_found = true;
81                 break;
82             }
83         }
84         if (!fmt_found || !data_found) {
85             throw new UnsupportedAudioFileException();
86         }
87         AudioFormat audioformat = new AudioFormat(
88                 Encoding.PCM_FLOAT, samplerate, bits, channels,
89                 framesize, samplerate, false);
90         return new StandardFileFormat(AudioFileFormat.Type.WAVE, audioformat,
91                                       dataSize / audioformat.getFrameSize());
92     }
93 
94     @Override
getAudioInputStream(final InputStream stream)95     public AudioInputStream getAudioInputStream(final InputStream stream)
96             throws UnsupportedAudioFileException, IOException {
97 
98         final StandardFileFormat format = getAudioFileFormat(stream);
99         final AudioFormat af = format.getFormat();
100         final long length = format.getLongFrameLength();
101         // we've got everything, the stream is supported and it is at the
102         // beginning of the header, so find the data chunk again and return an
103         // AudioInputStream
104         final RIFFReader riffiterator = new RIFFReader(stream);
105         while (riffiterator.hasNextChunk()) {
106             RIFFReader chunk = riffiterator.nextChunk();
107             if (chunk.getFormat().equals("data")) {
108                 return new AudioInputStream(chunk, af, length);
109             }
110         }
111         throw new UnsupportedAudioFileException();
112     }
113 }
114