/**
* Blocks and reads into a <tt>Buffer</tt> from this <tt>PullBufferStream</tt>.
*
* @param buffer the <tt>Buffer</tt> this <tt>PullBufferStream</tt> is to read into
* @throws IOException if an I/O error occurs while this <tt>PullBufferStream</tt> reads into the
* specified <tt>Buffer</tt>
* @see AbstractVideoPullBufferStream#doRead(Buffer)
*/
@Override
protected void doRead(Buffer buffer) throws IOException {
/*
* Determine the Format in which we're expected to output. We cannot
* rely on the Format always being specified in the Buffer because it is
* not its responsibility, the DataSource of this ImageStream knows the
* output Format.
*/
Format format = buffer.getFormat();
if (format == null) {
format = getFormat();
if (format != null) buffer.setFormat(format);
}
if (format instanceof AVFrameFormat) {
Object o = buffer.getData();
AVFrame frame;
if (o instanceof AVFrame) frame = (AVFrame) o;
else {
frame = new AVFrame();
buffer.setData(frame);
}
AVFrameFormat avFrameFormat = (AVFrameFormat) format;
Dimension size = avFrameFormat.getSize();
ByteBuffer data = readScreenNative(size);
if (data != null) {
if (frame.avpicture_fill(data, avFrameFormat) < 0) {
data.free();
throw new IOException("avpicture_fill");
}
} else {
/*
* This can happen when we disconnect a monitor from computer
* before or during grabbing.
*/
throw new IOException("Failed to grab screen.");
}
} else {
byte[] bytes = (byte[]) buffer.getData();
Dimension size = ((VideoFormat) format).getSize();
bytes = readScreen(bytes, size);
buffer.setData(bytes);
buffer.setOffset(0);
buffer.setLength(bytes.length);
}
buffer.setHeader(null);
buffer.setTimeStamp(System.nanoTime());
buffer.setSequenceNumber(seqNo);
buffer.setFlags(Buffer.FLAG_SYSTEM_TIME | Buffer.FLAG_LIVE_DATA);
seqNo++;
}
private void newImage(Buffer buffer) {
Object data = buffer.getData();
if (!(data instanceof int[])) return;
RGBFormat format = (RGBFormat) buffer.getFormat();
DirectColorModel dcm =
new DirectColorModel(
format.getBitsPerPixel(),
format.getRedMask(),
format.getGreenMask(),
format.getBlueMask());
sourceImage =
new MemoryImageSource(
format.getLineStride(),
format.getSize().height,
dcm,
(int[]) data,
0,
format.getLineStride());
sourceImage.setAnimated(true);
sourceImage.setFullBufferUpdates(true);
if (component != null) {
destImage = component.createImage(sourceImage);
component.prepareImage(destImage, component);
}
}
@Override
public int process(Buffer input, Buffer output) {
if (!checkInputBuffer(input)) {
return BUFFER_PROCESSED_FAILED;
}
if (isEOM(input)) {
propagateEOM(output); // TODO: what about data? can there be any?
return BUFFER_PROCESSED_OK;
}
try {
// TODO: this is very inefficient - it allocates a new byte array
// (or more) every time
final ByteArrayInputStream is =
new ByteArrayInputStream((byte[]) input.getData(), input.getOffset(), input.getLength());
final BufferedImage image = ImageIO.read(is);
is.close();
final Buffer b =
ImageToBuffer.createBuffer(image, ((VideoFormat) outputFormat).getFrameRate());
output.setData(b.getData());
output.setOffset(b.getOffset());
output.setLength(b.getLength());
output.setFormat(b.getFormat()); // TODO: this is a bit hacky, this
// format will be more specific
// than the actual set output
// format, because now we know what
// ImageIO gave us for a
// BufferedImage as far as pixel
// masks, etc.
return BUFFER_PROCESSED_OK;
} catch (IOException e) {
output.setDiscard(true);
output.setLength(0);
return BUFFER_PROCESSED_FAILED;
}
}
/** Processes the data and renders it to a component */
public synchronized int process(Buffer buffer) {
if (component == null) return BUFFER_PROCESSED_FAILED;
Format inf = buffer.getFormat();
if (inf == null) return BUFFER_PROCESSED_FAILED;
if (inf != inputFormat || !buffer.getFormat().equals(inputFormat)) {
if (setInputFormat(inf) != null) return BUFFER_PROCESSED_FAILED;
}
Object data = buffer.getData();
if (!(data instanceof int[])) return BUFFER_PROCESSED_FAILED;
if (lastBuffer != buffer) {
lastBuffer = buffer;
newImage(buffer);
}
sourceImage.newPixels(0, 0, inWidth, inHeight);
Graphics g = component.getGraphics();
if (g != null) {
if (reqBounds == null) {
bounds = component.getBounds();
bounds.x = 0;
bounds.y = 0;
} else bounds = reqBounds;
g.drawImage(
destImage,
bounds.x,
bounds.y,
bounds.width,
bounds.height,
0,
0,
inWidth,
inHeight,
component);
}
return BUFFER_PROCESSED_OK;
}