| Methods Summary |
|---|
| public javax.media.Time | getDuration()
if ( duration.equals(Duration.DURATION_UNKNOWN) &&
( tracks[0] != null ) ) {
long mediaSizeAtEOM = ((BasicTrack) tracks[0]).getMediaSizeAtEOM();
if (mediaSizeAtEOM > 0) {
double durationSeconds = mediaSizeAtEOM / bytesPerSecond;
duration = new Time(durationSeconds);
}
}
return duration;
|
| public javax.media.Time | getMediaTime()
long location;
long seekLocation = ((BasicTrack) tracks[0]).getSeekLocation();
if (seekLocation != -1)
location = seekLocation - minLocation;
else
location = getLocation(stream) - minLocation;
synchronized(mediaTime) {
mediaTime.set( location / (double) bytesPerSecond );
}
return mediaTime;
|
| public java.lang.String | getName()Returns a descriptive name for the plug-in.
This is a user readable string.
return "Parser for raw GSM";
|
| public javax.media.protocol.ContentDescriptor[] | getSupportedInputContentDescriptors()
return supportedFormat;
|
| public javax.media.Track[] | getTracks()
if (tracks[0] != null)
return tracks;
stream = (PullSourceStream) streams[0];
// Since the readHeader doesn't read anything there
// is no need to disable buffering
readHeader();
bufferSize = bytesPerSecond;
tracks[0] = new GsmTrack((AudioFormat) format,
/*enabled=*/ true,
new Time(0),
numBuffers,
bufferSize,
minLocation,
maxLocation
);
return tracks;
|
| private void | readHeader()GSM
8000 samples per sec.
160 samples represent 20 milliseconds and GSM represents them
in 33 bytes. So frameSize is 33 bytes and there are 50 frames
in one second. One second is 1650 bytes.
minLocation = getLocation(stream); // Should be zero
long contentLength = stream.getContentLength();
if ( contentLength != SourceStream.LENGTH_UNKNOWN ) {
double durationSeconds = contentLength / bytesPerSecond;
duration = new Time(durationSeconds);
maxLocation = contentLength;
} else {
maxLocation = Long.MAX_VALUE;
}
boolean signed = true;
boolean bigEndian = false;
format = new AudioFormat(AudioFormat.GSM,
8000, // sampleRate,
16, // sampleSizeInBits,
1, // channels,
bigEndian ? AudioFormat.BIG_ENDIAN : AudioFormat.LITTLE_ENDIAN,
signed ? AudioFormat.SIGNED : AudioFormat.UNSIGNED,
(blockSize * 8), // frameSizeInBits
Format.NOT_SPECIFIED, // No FRAME_RATE specified
Format.byteArray);
|
| public javax.media.Time | setPosition(javax.media.Time where, int rounding)
if (! seekable ) {
return getMediaTime();
}
long time = where.getNanoseconds();
long newPos;
if (time < 0)
time = 0;
double newPosd = time * bytesPerSecond / 1000000000.0;
double remainder = (newPosd % blockSize);
newPos = (long) (newPosd - remainder);
if (remainder > 0) {
switch (rounding) {
case Positionable.RoundUp:
newPos += blockSize;
break;
case Positionable.RoundNearest:
if (remainder > (blockSize / 2.0))
newPos += blockSize;
break;
}
}
// if ( newPos > maxLocation )
// newPos = maxLocation;
newPos += minLocation;
((BasicTrack) tracks[0]).setSeekLocation(newPos);
if (cacheStream != null) {
synchronized(this) {
// cacheStream.setPosition(where.getNanoseconds());
cacheStream.abortRead();
}
}
return where; // TODO: return the actual time value
|
