/**
* 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++;
}
/** decode the buffer * */
public int process(Buffer inputBuffer, Buffer outputBuffer) {
if (!checkInputBuffer(inputBuffer)) {
return BUFFER_PROCESSED_FAILED;
}
if (isEOM(inputBuffer)) {
propagateEOM(outputBuffer);
return BUFFER_PROCESSED_OK;
}
Object outData = outputBuffer.getData();
outputBuffer.setData(inputBuffer.getData());
inputBuffer.setData(outData);
outputBuffer.setLength(inputBuffer.getLength());
outputBuffer.setFormat(outputFormat);
outputBuffer.setOffset(inputBuffer.getOffset());
return BUFFER_PROCESSED_OK;
}
@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;
}
}
@Override
public void readFrame(Buffer buffer) {
// example data:
// --ssBoundary8345
// Content-Type: image/jpeg
// Content-Length: 114587
try {
String line;
// eat leading blank lines
while (true) {
line = readLine(MAX_LINE_LENGTH);
if (line == null) {
buffer.setEOM(true);
buffer.setLength(0);
return;
}
if (!line.trim().equals("")) break; // end of header
}
if (boundary == null) {
boundary = line.trim(); // TODO: we should be able to get
// this from the content type, but
// the content type has this
// stripped out. So we'll just take
// the first nonblank line to be the
// boundary.
// System.out.println("boundary: " + boundary);
} else {
if (!line.trim().equals(boundary)) {
// throw new IOException("Expected boundary: " +
// toPrintable(line));
// TODO: why do we seem to get these when playing back
// mmr files recorded using FmjTranscode?
logger.warning("Expected boundary (frame " + framesRead + "): " + toPrintable(line));
// handle streams that are truncated in the middle of a
// frame:
final int eatResult = eatUntil(boundary); // TODO: no
// need to
// store the
// data
logger.info(
"Ignored bytes (eom after="
+ (eatResult < 0)
+ "): "
+ (eatResult < 0 ? (-1 * eatResult - 1) : eatResult));
if (eatResult < 0) {
buffer.setEOM(true);
buffer.setLength(0);
return;
}
// now read boundary
line = readLine(MAX_LINE_LENGTH);
if (!line.trim().equals(boundary)) {
throw new RuntimeException("No boundary found after eatUntil(boundary)"); // should
// never
// happen
}
}
}
final Properties properties = new Properties();
while (true) {
line = readLine(MAX_LINE_LENGTH);
if (line == null) {
buffer.setEOM(true);
buffer.setLength(0);
return;
}
if (line.trim().equals("")) break; // end of header
if (!parseProperty(line, properties))
throw new IOException("Expected property: " + toPrintable(line));
}
final String contentType = properties.getProperty("Content-Type".toUpperCase());
if (contentType == null) {
logger.warning("Header properties: " + properties);
throw new IOException("Expected Content-Type in header");
}
// check supported content types:
if (!isSupportedFrameContentType(contentType)) {
throw new IOException("Unsupported Content-Type: " + contentType);
}
if (frameContentType == null) {
frameContentType = contentType;
} else {
if (!contentType.equals(frameContentType))
throw new IOException(
"Content type changed during stream from "
+ frameContentType
+ " to "
+ contentType);
}
// TODO: check that size doesn't change throughout
final byte[] data;
final String contentLenStr = properties.getProperty("Content-Length".toUpperCase());
if (contentLenStr != null) { // if we know the content length, use it
final int contentLen;
try {
contentLen = Integer.parseInt(contentLenStr);
} catch (NumberFormatException e) {
throw new IOException("Invalid content length: " + contentLenStr);
}
// now, read the content-length bytes
data = readFully(contentLen); // TODO: don't realloc each
// time
} else {
// if we don't know the content length, just read until we
// find the boundary.
// Some IP cameras don't specify it, like
// http://webcam-1.duesseldorf.it-on.net/cgi-bin/nph-update.cgi
data = readUntil(boundary);
}
// ext
final String timestampStr = properties.getProperty(TIMESTAMP_KEY.toUpperCase());
if (timestampStr != null) {
try {
final long timestamp = Long.parseLong(timestampStr);
buffer.setTimeStamp(timestamp);
} catch (NumberFormatException e) {
logger.log(Level.WARNING, "" + e, e);
}
}
if (data == null) {
buffer.setEOM(true);
buffer.setLength(0);
return;
}
buffer.setData(data);
buffer.setOffset(0);
buffer.setLength(data.length);
++framesRead;
} catch (IOException e) {
throw new RuntimeException(e);
}
}
/** {@inheritDoc} */
@Override
protected int doProcess(Buffer inBuffer, Buffer outBuffer) {
byte[] inData = (byte[]) inBuffer.getData();
int inOffset = inBuffer.getOffset();
if (!VP8PayloadDescriptor.isValid(inData, inOffset)) {
logger.warn("Invalid RTP/VP8 packet discarded.");
outBuffer.setDiscard(true);
return BUFFER_PROCESSED_FAILED; // XXX: FAILED or OK?
}
long inSeq = inBuffer.getSequenceNumber();
long inRtpTimestamp = inBuffer.getRtpTimeStamp();
int inPictureId = VP8PayloadDescriptor.getPictureId(inData, inOffset);
boolean inMarker = (inBuffer.getFlags() & Buffer.FLAG_RTP_MARKER) != 0;
boolean inIsStartOfFrame = VP8PayloadDescriptor.isStartOfFrame(inData, inOffset);
int inLength = inBuffer.getLength();
int inPdSize = VP8PayloadDescriptor.getSize(inData, inOffset);
int inPayloadLength = inLength - inPdSize;
if (empty && lastSentSeq != -1 && seqNumComparator.compare(inSeq, lastSentSeq) != 1) {
if (logger.isInfoEnabled()) logger.info("Discarding old packet (while empty) " + inSeq);
outBuffer.setDiscard(true);
return BUFFER_PROCESSED_OK;
}
if (!empty) {
// if the incoming packet has a different PictureID or timestamp
// than those of the current frame, then it belongs to a different
// frame.
if ((inPictureId != -1 && pictureId != -1 && inPictureId != pictureId)
| (timestamp != -1 && inRtpTimestamp != -1 && inRtpTimestamp != timestamp)) {
if (seqNumComparator.compare(inSeq, firstSeq) != 1) // inSeq <= firstSeq
{
// the packet belongs to a previous frame. discard it
if (logger.isInfoEnabled()) logger.info("Discarding old packet " + inSeq);
outBuffer.setDiscard(true);
return BUFFER_PROCESSED_OK;
} else // inSeq > firstSeq (and also presumably isSeq > lastSeq)
{
// the packet belongs to a subsequent frame (to the one
// currently being held). Drop the current frame.
if (logger.isInfoEnabled())
logger.info(
"Discarding saved packets on arrival of"
+ " a packet for a subsequent frame: "
+ inSeq);
// TODO: this would be the place to complain about the
// not-well-received PictureID by sending a RTCP SLI or NACK.
reinit();
}
}
}
// a whole frame in a single packet. avoid the extra copy to
// this.data and output it immediately.
if (empty && inMarker && inIsStartOfFrame) {
byte[] outData = validateByteArraySize(outBuffer, inPayloadLength, false);
System.arraycopy(inData, inOffset + inPdSize, outData, 0, inPayloadLength);
outBuffer.setOffset(0);
outBuffer.setLength(inPayloadLength);
outBuffer.setRtpTimeStamp(inBuffer.getRtpTimeStamp());
if (TRACE) logger.trace("Out PictureID=" + inPictureId);
lastSentSeq = inSeq;
return BUFFER_PROCESSED_OK;
}
// add to this.data
Container container = free.poll();
if (container == null) container = new Container();
if (container.buf == null || container.buf.length < inPayloadLength)
container.buf = new byte[inPayloadLength];
if (data.get(inSeq) != null) {
if (logger.isInfoEnabled())
logger.info("(Probable) duplicate packet detected, discarding " + inSeq);
outBuffer.setDiscard(true);
return BUFFER_PROCESSED_OK;
}
System.arraycopy(inData, inOffset + inPdSize, container.buf, 0, inPayloadLength);
container.len = inPayloadLength;
data.put(inSeq, container);
// update fields
frameLength += inPayloadLength;
if (firstSeq == -1 || (seqNumComparator.compare(firstSeq, inSeq) == 1)) firstSeq = inSeq;
if (lastSeq == -1 || (seqNumComparator.compare(inSeq, lastSeq) == 1)) lastSeq = inSeq;
if (empty) {
// the first received packet for the current frame was just added
empty = false;
timestamp = inRtpTimestamp;
pictureId = inPictureId;
}
if (inMarker) haveEnd = true;
if (inIsStartOfFrame) haveStart = true;
// check if we have a full frame
if (frameComplete()) {
byte[] outData = validateByteArraySize(outBuffer, frameLength, false);
int ptr = 0;
Container b;
for (Map.Entry<Long, Container> entry : data.entrySet()) {
b = entry.getValue();
System.arraycopy(b.buf, 0, outData, ptr, b.len);
ptr += b.len;
}
outBuffer.setOffset(0);
outBuffer.setLength(frameLength);
outBuffer.setRtpTimeStamp(inBuffer.getRtpTimeStamp());
if (TRACE) logger.trace("Out PictureID=" + inPictureId);
lastSentSeq = lastSeq;
// prepare for the next frame
reinit();
return BUFFER_PROCESSED_OK;
} else {
// frame not complete yet
outBuffer.setDiscard(true);
return OUTPUT_BUFFER_NOT_FILLED;
}
}