/** Gets an image via the cam */
boolean camFetchFrame() {
try {
if (converter == null) {
pbs.read(buffer);
} else {
if (inputBuffer == null) {
inputBuffer = new Buffer();
}
pbs.read(inputBuffer);
converter.process(inputBuffer, buffer);
}
if (buffer.isDiscard()) {
buffer.setDiscard(false);
return false;
}
if (buffer.getData() == null) {
return false;
}
} catch (Exception e) {
return false;
}
return true;
}
/** Write the buffer to the SourceDataLine. */
public int process(Buffer buffer) {
// if we need to convert the format, do so using the codec.
if (codec != null) {
final int codecResult = codec.process(buffer, codecBuffer);
if (codecResult == BUFFER_PROCESSED_FAILED) return BUFFER_PROCESSED_FAILED;
if (codecResult == OUTPUT_BUFFER_NOT_FILLED) return BUFFER_PROCESSED_OK;
buffer = codecBuffer;
}
int length = buffer.getLength();
int offset = buffer.getOffset();
final Format format = buffer.getFormat();
final Class type = format.getDataType();
if (type != Format.byteArray) {
return BUFFER_PROCESSED_FAILED;
}
final byte[] data = (byte[]) buffer.getData();
final boolean bufferNotConsumed;
final int newBufferLength; // only applicable if bufferNotConsumed
final int newBufferOffset; // only applicable if bufferNotConsumed
if (NON_BLOCKING) {
// TODO: handle sourceLine.available(). This code currently causes choppy audio.
if (length > sourceLine.available()) {
// we should only write sourceLine.available() bytes, then return INPUT_BUFFER_NOT_CONSUMED.
length = sourceLine.available(); // don't try to write more than available
bufferNotConsumed = true;
newBufferLength = buffer.getLength() - length;
newBufferOffset = buffer.getOffset() + length;
} else {
bufferNotConsumed = false;
newBufferLength = length;
newBufferOffset = offset;
}
} else {
bufferNotConsumed = false;
newBufferLength = 0;
newBufferOffset = 0;
}
if (length == 0) {
logger.finer("Buffer has zero length, flags = " + buffer.getFlags());
}
// make sure all the bytes are written.
while (length > 0) {
// logger.fine("Available: " + sourceLine.available());
// logger.fine("length: " + length);
// logger.fine("sourceLine.getBufferSize(): " + sourceLine.getBufferSize());
final int n =
sourceLine.write(
data, offset, length); // TODO: this can block for a very long time if it doesn't
if (n >= length) break;
else if (n == 0) {
// TODO: we could choose to handle a write failure this way,
// assuming that it is considered legal to call stop while process is being called.
// however, that seems like a bad idea in general.
// if (!sourceLine.isRunning())
// {
// buffer.setLength(offset);
// buffer.setOffset(length);
// return INPUT_BUFFER_NOT_CONSUMED; // our write was interrupted.
// }
logger.warning(
"sourceLine.write returned 0, offset="
+ offset
+ "; length="
+ length
+ "; available="
+ sourceLine.available()
+ "; frame size in bytes"
+ sourceLine.getFormat().getFrameSize()
+ "; sourceLine.isActive() = "
+ sourceLine.isActive()
+ "; "
+ sourceLine.isOpen()
+ "; sourceLine.isRunning()="
+ sourceLine.isRunning());
return BUFFER_PROCESSED_FAILED; // sourceLine.write docs indicate that this will only happen
// if there is an error.
} else {
offset += n;
length -= n;
}
}
if (bufferNotConsumed) {
// return INPUT_BUFFER_NOT_CONSUMED if not all bytes were written
buffer.setLength(newBufferLength);
buffer.setOffset(newBufferOffset);
return INPUT_BUFFER_NOT_CONSUMED;
}
if (buffer.isEOM()) {
// TODO: the proper way to do this is to implement Drainable, and let the processor call our
// drain method.
sourceLine
.drain(); // we need to ensure that the media finishes playing, otherwise the EOM event
// will
// be posted before the media finishes playing.
}
return BUFFER_PROCESSED_OK;
}