| Methods Summary |
|---|
| public javax.media.Time | getDuration()
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 AU file format";
|
| public javax.media.protocol.ContentDescriptor[] | getSupportedInputContentDescriptors()
return supportedFormat;
|
| public javax.media.Track[] | getTracks()
if (tracks[0] != null)
return tracks;
stream = (PullSourceStream) streams[0];
if (cacheStream != null) {
// Disable jitter buffer during parsing of the header
cacheStream.setEnabledBuffering(false);
}
readHeader();
if (cacheStream != null) {
cacheStream.setEnabledBuffering(true);
}
minLocation = getLocation(stream);
if (dataSize == -1) { // Unknown
maxLocation = Long.MAX_VALUE; // ??
} else {
maxLocation = minLocation + dataSize;
}
// System.out.println("Location after readHeader() is " + minLocation);
// System.out.println("minLocation is " + minLocation);
// System.out.println("maxLocation is " + maxLocation);
tracks[0] = new AuTrack((AudioFormat) format,
/*enabled=*/ true,
new Time(0),
numBuffers,
bufferSize,
minLocation,
maxLocation
);
return tracks;
|
| private void | readHeader()
boolean bigEndian;
int magic = readInt(stream, /* bigEndian = */ true);
// System.out.println("Magic is " + Integer.toHexString(magic));
if ( magic == AU_SUN_MAGIC || magic == AU_DEC_MAGIC ) {
bigEndian = true;
} else if ( magic == AU_SUN_INV_MAGIC || magic == AU_DEC_INV_MAGIC ) {
bigEndian = false;
} else {
throw new BadHeaderException("Invalid magic number " +
Integer.toHexString(magic));
}
int headerSize = readInt(stream);
if (headerSize < 24) {
throw new BadHeaderException("AU Parser: header size should be atleast 24 but is "
+ headerSize);
}
dataSize = readInt(stream);
if (dataSize == -1) {
// Unknown DataSize
// System.out.println("Unknown datasize");
long contentLength = stream.getContentLength();
if ( contentLength != SourceStream.LENGTH_UNKNOWN ) {
dataSize = (int) (contentLength - headerSize);
if (dataSize < 0) {
dataSize = -1;
}
}
}
int encoding = readInt(stream);
int sampleSizeInBits;
blockSize = -1;
switch (encoding) {
case AU_ULAW_8:
encodingString = AudioFormat.ULAW;
sampleSizeInBits = 8;
blockSize = 1;
break;
case AU_ALAW_8:
encodingString = AudioFormat.ALAW;
sampleSizeInBits = 8;
blockSize = 1;
break;
case AU_LINEAR_8:
encodingString = AudioFormat.LINEAR;
sampleSizeInBits = 8;
blockSize = 1;
break;
case AU_LINEAR_16:
encodingString = AudioFormat.LINEAR;
sampleSizeInBits = 16;
blockSize = 2;
break;
case AU_LINEAR_24:
encodingString = AudioFormat.LINEAR;
sampleSizeInBits = 24;
blockSize = 3;
break;
case AU_LINEAR_32:
encodingString = AudioFormat.LINEAR;
sampleSizeInBits = 32;
blockSize = 4;
break;
case AU_FLOAT:
encodingString = "float"; // AudioFormat.JAUDIO_FLOAT;
sampleSizeInBits = 32;
blockSize = 4;
break;
case AU_DOUBLE:
encodingString = "double"; // AudioFormat.JAUDIO_DOUBLE;
sampleSizeInBits = 64;
blockSize = 8;
break;
case AU_ADPCM_G721:
encodingString = "??? what adpcm"; // AudioFormat.JAUDIO_G721_ADPCM;
sampleSizeInBits = 4;
break;
case AU_ADPCM_G723_3:
encodingString = "G723_3"; // AudioFormat.JAUDIO_G723_3;
sampleSizeInBits = 3;
break;
case AU_ADPCM_G723_5:
encodingString = "G723_5"; // AudioFormat.JAUDIO_G723_5;
sampleSizeInBits = 5;
break;
default:
throw new BadHeaderException("Unsupported encoding: " +
Integer.toHexString(encoding));
}
int sampleRate = readInt(stream);
if ( sampleRate < 0 )
throw new BadHeaderException("Negative Sample Rate " + sampleRate);
int channels = readInt(stream);
if ( channels < 1 )
throw new BadHeaderException("Number of channels is " + channels);
if (blockSize != -1)
blockSize *= channels;
// System.out.println("blockSize is " + blockSize);
// System.out.println("dataSize is " + dataSize);
// System.out.println("dataSize is " + Integer.toHexString(dataSize));
// System.out.println("sampleRate is " + sampleRate);
skip(stream, headerSize - (6*4));
// bytesPerSecond cannot be negative because of the above checks.
bytesPerSecond = channels * sampleSizeInBits * sampleRate / 8;
int frameSizeInBytes = channels * sampleSizeInBits / 8;
bufferSize = bytesPerSecond;
// System.out.println("bytesPerSecond is " + bytesPerSecond);
// System.out.println("frameSizeInBytes is " + frameSizeInBytes);
// System.out.println("bufferSize is " + bufferSize);
if (dataSize != -1) {
double durationSeconds = (double) dataSize / bytesPerSecond;
duration = new Time(durationSeconds);
}
// System.out.println("duration is " + duration.getSeconds());
boolean signed = true;
format = new AudioFormat(encodingString,
sampleRate,
sampleSizeInBits,
channels,
bigEndian ? AudioFormat.BIG_ENDIAN : AudioFormat.LITTLE_ENDIAN,
signed ? AudioFormat.SIGNED : AudioFormat.UNSIGNED,
frameSizeInBytes * 8,
Format.NOT_SPECIFIED, // No FRAME_RATE specified
Format.byteArray);
// System.out.println("Audio format is " + format);
|
| public javax.media.Time | setPosition(javax.media.Time where, int rounding)
if (! seekable ) {
return getMediaTime();
}
if (blockSize < 0) {
// System.out.println("ERROR: setPosition not implemented for this encoding "
// + encodingString);
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
|
