private MediaFormat[] getEncodings() {
if (encodings != null) return encodings;
MediaFormat[] availableEncodings = encodingConfiguration.getAllEncodings(type);
int encodingCount = availableEncodings.length;
if (encodingCount < 1) encodings = MediaUtils.EMPTY_MEDIA_FORMATS;
else {
/*
* The MediaFormats will be displayed by encoding (name) and clock
* rate and EncodingConfiguration will store them that way so this
* TableModel should better display unique encoding-clock rate
* pairs.
*/
HashMap<String, MediaFormat> availableEncodingSet = new HashMap<String, MediaFormat>();
for (MediaFormat availableEncoding : availableEncodings) {
availableEncodingSet.put(
availableEncoding.getEncoding() + "/" + availableEncoding.getClockRateString(),
availableEncoding);
}
availableEncodings = availableEncodingSet.values().toArray(MediaUtils.EMPTY_MEDIA_FORMATS);
encodingCount = availableEncodings.length;
encodings = new MediaFormat[encodingCount];
System.arraycopy(availableEncodings, 0, encodings, 0, encodingCount);
// Display the encodings in decreasing priority.
Arrays.sort(
encodings,
0,
encodingCount,
new Comparator<MediaFormat>() {
public int compare(MediaFormat format0, MediaFormat format1) {
int ret =
encodingConfiguration.getPriority(format1)
- encodingConfiguration.getPriority(format0);
if (ret == 0) {
/*
* In the cases of equal priorities, display them
* sorted by encoding name in increasing order.
*/
ret = format0.getEncoding().compareToIgnoreCase(format1.getEncoding());
if (ret == 0) {
/*
* In the cases of equal priorities and equal
* encoding names, display them sorted by clock
* rate in decreasing order.
*/
ret = Double.compare(format1.getClockRate(), format0.getClockRate());
}
}
return ret;
}
});
}
return encodings;
}
public int write(byte[] buffer, int offset, int length, boolean transform) {
RawPacket pkt = rawPacketArray[0];
if (pkt == null) pkt = new RawPacket();
rawPacketArray[0] = pkt;
byte[] pktBuf = pkt.getBuffer();
if (pktBuf == null || pktBuf.length < length) {
pktBuf = new byte[length];
pkt.setBuffer(pktBuf);
}
System.arraycopy(buffer, offset, pktBuf, 0, length);
pkt.setOffset(0);
pkt.setLength(length);
if (transform) {
PacketTransformer packetTransformer =
isControlStream ? rtcpPacketTransformer : rtpPacketTransformer;
if (packetTransformer != null)
rawPacketArray = packetTransformer.reverseTransform(rawPacketArray);
}
SourceTransferHandler transferHandler;
PushSourceStream pushSourceStream;
try {
if (isControlStream) {
transferHandler = controlTransferHandler;
pushSourceStream = getControlInputStream();
} else {
transferHandler = dataTransferHandler;
pushSourceStream = getDataInputStream();
}
} catch (IOException ioe) {
throw new UndeclaredThrowableException(ioe);
}
for (int i = 0; i < rawPacketArray.length; i++) {
RawPacket packet = rawPacketArray[i];
// keep the first element for reuse
if (i != 0) rawPacketArray[i] = null;
if (packet != null) {
if (isControlStream) pendingControlPacket = packet;
else pendingDataPacket = packet;
if (transferHandler != null) {
transferHandler.transferData(pushSourceStream);
}
}
}
return length;
}
/**
* Adds a specific (RTP) SSRC to the list of SSRCs seen/received on this <tt>Channel</tt>.
* Invoked by the Jitsi Videobridge server, not its clients.
*
* @param ssrc the (RTP) SSRC to be added to the list of SSRCs seen/received on this
* <tt>Channel</tt>
* @return <tt>true</tt> if the list of SSRCs seen/received on this <tt>Channel</tt> has been
* modified as part of the method call; otherwise, <tt>false</tt>
*/
public synchronized boolean addSSRC(int ssrc) {
// contains
for (int i = 0; i < ssrcs.length; i++) if (ssrcs[i] == ssrc) return false;
// add
int[] newSSRCs = new int[ssrcs.length + 1];
System.arraycopy(ssrcs, 0, newSSRCs, 0, ssrcs.length);
newSSRCs[ssrcs.length] = ssrc;
ssrcs = newSSRCs;
return true;
}
/**
* Encapsulates {@code pkt} in the RTX format, using {@code rtxSsrc} as its SSRC, and transmits it
* to {@link #channel} by injecting it in the {@code MediaStream}.
*
* @param pkt the packet to transmit.
* @param rtxSsrc the SSRC for the RTX stream.
* @return {@code true} if the packet was successfully retransmitted, {@code false} otherwise.
*/
private boolean encapsulateInRtxAndTransmit(RawPacket pkt, long rtxSsrc) {
byte[] buf = pkt.getBuffer();
int len = pkt.getLength();
int off = pkt.getOffset();
byte[] newBuf = buf;
if (buf.length < len + 2) {
// FIXME The byte array newly allocated and assigned to newBuf must
// be made known to pkt eventually.
newBuf = new byte[len + 2];
}
int osn = pkt.getSequenceNumber();
int headerLength = pkt.getHeaderLength();
int payloadLength = len - headerLength;
System.arraycopy(buf, off, newBuf, 0, headerLength);
// FIXME If newBuf is actually buf, then we will override the first two
// bytes of the payload bellow.
newBuf[headerLength] = (byte) ((osn >> 8) & 0xff);
newBuf[headerLength + 1] = (byte) (osn & 0xff);
System.arraycopy(buf, off + headerLength, newBuf, headerLength + 2, payloadLength);
// FIXME We tried to extend the payload of pkt by two bytes above but
// we never told pkt that its length has increased by these two bytes.
MediaStream mediaStream = channel.getStream();
if (mediaStream != null) {
pkt.setSSRC((int) rtxSsrc);
// Only call getNextRtxSequenceNumber() when we're sure we're going
// to transmit a packet, because it consumes a sequence number.
pkt.setSequenceNumber(getNextRtxSequenceNumber(rtxSsrc));
try {
mediaStream.injectPacket(pkt, /* data */ true, /* after */ null);
} catch (TransmissionFailedException tfe) {
logger.warn("Failed to transmit an RTX packet.");
return false;
}
}
return true;
}
/**
* Encapsulates {@code pkt} in the RTX format, using {@code rtxSsrc} as its SSRC, and transmits it
* to {@link #channel} by injecting it in the {@code MediaStream}.
*
* @param pkt the packet to transmit.
* @param rtxSsrc the SSRC for the RTX stream.
* @param after the {@code TransformEngine} in the chain of {@code TransformEngine}s of the
* associated {@code MediaStream} after which the injection of {@code pkt} is to begin
* @return {@code true} if the packet was successfully retransmitted, {@code false} otherwise.
*/
private boolean encapsulateInRtxAndTransmit(RawPacket pkt, long rtxSsrc, TransformEngine after) {
byte[] buf = pkt.getBuffer();
int len = pkt.getLength();
int off = pkt.getOffset();
byte[] newBuf = new byte[len + 2];
RawPacket rtxPkt = new RawPacket(newBuf, 0, len + 2);
int osn = pkt.getSequenceNumber();
int headerLength = pkt.getHeaderLength();
int payloadLength = pkt.getPayloadLength();
// Copy the header.
System.arraycopy(buf, off, newBuf, 0, headerLength);
// Set the OSN field.
newBuf[headerLength] = (byte) ((osn >> 8) & 0xff);
newBuf[headerLength + 1] = (byte) (osn & 0xff);
// Copy the payload.
System.arraycopy(buf, off + headerLength, newBuf, headerLength + 2, payloadLength);
MediaStream mediaStream = channel.getStream();
if (mediaStream != null) {
rtxPkt.setSSRC((int) rtxSsrc);
rtxPkt.setPayloadType(rtxPayloadType);
// Only call getNextRtxSequenceNumber() when we're sure we're going
// to transmit a packet, because it consumes a sequence number.
rtxPkt.setSequenceNumber(getNextRtxSequenceNumber(rtxSsrc));
try {
mediaStream.injectPacket(rtxPkt, /* data */ true, after);
} catch (TransmissionFailedException tfe) {
logger.warn("Failed to transmit an RTX packet.");
return false;
}
}
return true;
}
/**
* Removes a specific (RTP) SSRC from the list of SSRCs seen/received on this <tt>Channel</tt>.
* Invoked by the Jitsi Videobridge server, not its clients.
*
* @param ssrc the (RTP) SSRC to be removed from the list of SSRCs seen/received on this
* <tt>Channel</tt>
* @return <tt>true</tt> if the list of SSRCs seen/received on this <tt>Channel</tt> has been
* modified as part of the method call; otherwise, <tt>false</tt>
*/
public synchronized boolean removeSSRC(int ssrc) {
if (ssrcs.length == 1) {
if (ssrcs[0] == ssrc) {
ssrcs = NO_SSRCS;
return true;
} else return false;
} else {
for (int i = 0; i < ssrcs.length; i++) {
if (ssrcs[i] == ssrc) {
int[] newSSRCs = new int[ssrcs.length - 1];
if (i != 0) System.arraycopy(ssrcs, 0, newSSRCs, 0, i);
if (i != newSSRCs.length) {
System.arraycopy(ssrcs, i + 1, newSSRCs, i, newSSRCs.length - i);
}
ssrcs = newSSRCs;
return true;
}
}
return false;
}
}
@Override
public int read(byte[] buffer, int offset, int length) throws IOException {
RawPacket pendingPacket;
if (isControlStream) {
pendingPacket = pendingControlPacket;
} else {
pendingPacket = pendingDataPacket;
}
int bytesToRead = 0;
byte[] pendingPacketBuffer = pendingPacket.getBuffer();
if (pendingPacketBuffer != null) {
int pendingPacketLength = pendingPacket.getLength();
bytesToRead = length > pendingPacketLength ? pendingPacketLength : length;
System.arraycopy(
pendingPacketBuffer, pendingPacket.getOffset(), buffer, offset, bytesToRead);
}
return bytesToRead;
}
/**
* Removes the RTX encapsulation from a packet.
*
* @param pkt the packet to remove the RTX encapsulation from.
* @return the original media packet represented by {@code pkt}, or null if we couldn't
* reconstruct the original packet.
*/
private RawPacket deRtx(RawPacket pkt) {
boolean success = false;
if (pkt.getPayloadLength() - pkt.getPaddingSize() < 2) {
// We need at least 2 bytes to read the OSN field.
if (logger.isDebugEnabled()) {
logger.debug("Dropping an incoming RTX packet with padding only: " + pkt);
}
return null;
}
long mediaSsrc = getPrimarySsrc(pkt);
if (mediaSsrc != -1) {
if (rtxAssociatedPayloadType != -1) {
int osn = pkt.getOriginalSequenceNumber();
// Remove the RTX header by moving the RTP header two bytes
// right.
byte[] buf = pkt.getBuffer();
int off = pkt.getOffset();
System.arraycopy(buf, off, buf, off + 2, pkt.getHeaderLength());
pkt.setOffset(off + 2);
pkt.setLength(pkt.getLength() - 2);
pkt.setSSRC((int) mediaSsrc);
pkt.setSequenceNumber(osn);
pkt.setPayloadType(rtxAssociatedPayloadType);
success = true;
} else {
logger.warn(
"RTX packet received, but no APT is defined. Packet "
+ "SSRC "
+ pkt.getSSRCAsLong()
+ ", associated media"
+ " SSRC "
+ mediaSsrc);
}
}
// If we failed to handle the RTX packet, drop it.
return success ? pkt : null;
}
/**
* Creates a {@code RawPacket} which represents the original packet encapsulated in {@code pkt}
* using the RTX format.
*
* @param pkt the packet from which to extract a media packet.
* @return the extracted media packet.
*/
private RawPacket createMediaPacket(RawPacket pkt) {
RawPacket mediaPacket = null;
long rtxSsrc = pkt.getSSRC() & 0xffffffffL;
// We need to know the SSRC paired with rtxSsrc *as seen by the
// receiver (i.e. this.channel)*. However, we only store SSRCs
// that endpoints *send* with.
// We therefore assume that SSRC re-writing has not introduced any
// new SSRCs and therefor the FID mappings known to the senders
// also apply to receivers.
RtpChannel sourceChannel = channel.getContent().findChannelByFidSsrc(rtxSsrc);
if (sourceChannel != null) {
long mediaSsrc = sourceChannel.getFidPairedSsrc(rtxSsrc);
if (mediaSsrc != -1) {
byte apt = sourceChannel.getRtxAssociatedPayloadType();
if (apt != -1) {
mediaPacket = new RawPacket(pkt.getBuffer().clone(), pkt.getOffset(), pkt.getLength());
// Remove the RTX header by moving the RTP header two bytes
// right.
byte[] buf = mediaPacket.getBuffer();
int off = mediaPacket.getOffset();
System.arraycopy(buf, off, buf, off + 2, mediaPacket.getHeaderLength());
mediaPacket.setOffset(off + 2);
mediaPacket.setLength(pkt.getLength() - 2);
mediaPacket.setSSRC((int) mediaSsrc);
mediaPacket.setSequenceNumber(pkt.getOriginalSequenceNumber());
mediaPacket.setPayloadType(apt);
}
}
}
return mediaPacket;
}
/**
* Makes <tt>RTCPRRPacket</tt>s using information in FMJ.
*
* @param time
* @return A <tt>Collection</tt> of <tt>RTCPRRPacket</tt>s to inject to the <tt>MediaStream</tt>.
*/
private Collection<RTCPRRPacket> makeRTCPRRPackets(long time) {
RTCPReportBlock[] reportBlocks = makeRTCPReportBlocks(time);
if (reportBlocks == null || reportBlocks.length == 0) {
return null;
}
Collection<RTCPRRPacket> rrPackets = new ArrayList<RTCPRRPacket>();
// We use the stream's local source ID (SSRC) as the SSRC of packet
// sender.
long streamSSRC = getLocalSSRC();
// Since a maximum of 31 reception report blocks will fit in an SR
// or RR packet, additional RR packets SHOULD be stacked after the
// initial SR or RR packet as needed to contain the reception
// reports for all sources heard during the interval since the last
// report.
if (reportBlocks.length > MAX_RTCP_REPORT_BLOCKS) {
for (int offset = 0; offset < reportBlocks.length; offset += MAX_RTCP_REPORT_BLOCKS) {
RTCPReportBlock[] blocks =
(reportBlocks.length - offset < MAX_RTCP_REPORT_BLOCKS)
? new RTCPReportBlock[reportBlocks.length - offset]
: MAX_RTCP_REPORT_BLOCKS_ARRAY;
System.arraycopy(reportBlocks, offset, blocks, 0, blocks.length);
RTCPRRPacket rr = new RTCPRRPacket((int) streamSSRC, blocks);
rrPackets.add(rr);
}
} else {
RTCPRRPacket rr = new RTCPRRPacket((int) streamSSRC, reportBlocks);
rrPackets.add(rr);
}
return rrPackets;
}
/**
* Creates the video advanced settings.
*
* @return video advanced settings panel.
*/
private static Component createVideoAdvancedSettings() {
ResourceManagementService resources = NeomediaActivator.getResources();
final DeviceConfiguration deviceConfig = mediaService.getDeviceConfiguration();
TransparentPanel centerPanel = new TransparentPanel(new GridBagLayout());
centerPanel.setMaximumSize(new Dimension(WIDTH, 150));
JButton resetDefaultsButton =
new JButton(resources.getI18NString("impl.media.configform.VIDEO_RESET"));
JPanel resetButtonPanel = new TransparentPanel(new FlowLayout(FlowLayout.RIGHT));
resetButtonPanel.add(resetDefaultsButton);
final JPanel centerAdvancedPanel = new TransparentPanel(new BorderLayout());
centerAdvancedPanel.add(centerPanel, BorderLayout.NORTH);
centerAdvancedPanel.add(resetButtonPanel, BorderLayout.SOUTH);
GridBagConstraints constraints = new GridBagConstraints();
constraints.fill = GridBagConstraints.HORIZONTAL;
constraints.anchor = GridBagConstraints.NORTHWEST;
constraints.insets = new Insets(5, 5, 0, 0);
constraints.gridx = 0;
constraints.weightx = 0;
constraints.weighty = 0;
constraints.gridy = 0;
centerPanel.add(
new JLabel(resources.getI18NString("impl.media.configform.VIDEO_RESOLUTION")), constraints);
constraints.gridy = 1;
constraints.insets = new Insets(0, 0, 0, 0);
final JCheckBox frameRateCheck =
new SIPCommCheckBox(resources.getI18NString("impl.media.configform.VIDEO_FRAME_RATE"));
centerPanel.add(frameRateCheck, constraints);
constraints.gridy = 2;
constraints.insets = new Insets(5, 5, 0, 0);
centerPanel.add(
new JLabel(resources.getI18NString("impl.media.configform.VIDEO_PACKETS_POLICY")),
constraints);
constraints.weightx = 1;
constraints.gridx = 1;
constraints.gridy = 0;
constraints.insets = new Insets(5, 0, 0, 5);
Object[] resolutionValues = new Object[DeviceConfiguration.SUPPORTED_RESOLUTIONS.length + 1];
System.arraycopy(
DeviceConfiguration.SUPPORTED_RESOLUTIONS,
0,
resolutionValues,
1,
DeviceConfiguration.SUPPORTED_RESOLUTIONS.length);
final JComboBox sizeCombo = new JComboBox(resolutionValues);
sizeCombo.setRenderer(new ResolutionCellRenderer());
sizeCombo.setEditable(false);
centerPanel.add(sizeCombo, constraints);
// default value is 20
final JSpinner frameRate = new JSpinner(new SpinnerNumberModel(20, 5, 30, 1));
frameRate.addChangeListener(
new ChangeListener() {
public void stateChanged(ChangeEvent e) {
deviceConfig.setFrameRate(
((SpinnerNumberModel) frameRate.getModel()).getNumber().intValue());
}
});
constraints.gridy = 1;
constraints.insets = new Insets(0, 0, 0, 5);
centerPanel.add(frameRate, constraints);
frameRateCheck.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (frameRateCheck.isSelected()) {
deviceConfig.setFrameRate(
((SpinnerNumberModel) frameRate.getModel()).getNumber().intValue());
} else // unlimited framerate
deviceConfig.setFrameRate(-1);
frameRate.setEnabled(frameRateCheck.isSelected());
}
});
final JSpinner videoMaxBandwidth =
new JSpinner(
new SpinnerNumberModel(deviceConfig.getVideoMaxBandwidth(), 1, Integer.MAX_VALUE, 1));
videoMaxBandwidth.addChangeListener(
new ChangeListener() {
public void stateChanged(ChangeEvent e) {
deviceConfig.setVideoMaxBandwidth(
((SpinnerNumberModel) videoMaxBandwidth.getModel()).getNumber().intValue());
}
});
constraints.gridx = 1;
constraints.gridy = 2;
constraints.insets = new Insets(0, 0, 5, 5);
centerPanel.add(videoMaxBandwidth, constraints);
resetDefaultsButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
// reset to defaults
sizeCombo.setSelectedIndex(0);
frameRateCheck.setSelected(false);
frameRate.setEnabled(false);
frameRate.setValue(20);
// unlimited framerate
deviceConfig.setFrameRate(-1);
videoMaxBandwidth.setValue(DeviceConfiguration.DEFAULT_VIDEO_MAX_BANDWIDTH);
}
});
// load selected value or auto
Dimension videoSize = deviceConfig.getVideoSize();
if ((videoSize.getHeight() != DeviceConfiguration.DEFAULT_VIDEO_HEIGHT)
&& (videoSize.getWidth() != DeviceConfiguration.DEFAULT_VIDEO_WIDTH))
sizeCombo.setSelectedItem(deviceConfig.getVideoSize());
else sizeCombo.setSelectedIndex(0);
sizeCombo.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
Dimension selectedVideoSize = (Dimension) sizeCombo.getSelectedItem();
if (selectedVideoSize == null) {
// the auto value, default one
selectedVideoSize =
new Dimension(
DeviceConfiguration.DEFAULT_VIDEO_WIDTH,
DeviceConfiguration.DEFAULT_VIDEO_HEIGHT);
}
deviceConfig.setVideoSize(selectedVideoSize);
}
});
frameRateCheck.setSelected(
deviceConfig.getFrameRate() != DeviceConfiguration.DEFAULT_VIDEO_FRAMERATE);
frameRate.setEnabled(frameRateCheck.isSelected());
if (frameRate.isEnabled()) frameRate.setValue(deviceConfig.getFrameRate());
return centerAdvancedPanel;
}
/**
* Initializes a new <tt>SRTPTransformer</tt> instance with a specific (negotiated)
* <tt>SRTPProtectionProfile</tt> and the keying material specified by a specific
* <tt>TlsContext</tt>.
*
* @param srtpProtectionProfile the (negotiated) <tt>SRTPProtectionProfile</tt> to initialize the
* new instance with
* @param tlsContext the <tt>TlsContext</tt> which represents the keying material
* @return a new <tt>SRTPTransformer</tt> instance initialized with <tt>srtpProtectionProfile</tt>
* and <tt>tlsContext</tt>
*/
private SinglePacketTransformer initializeSRTPTransformer(
int srtpProtectionProfile, TlsContext tlsContext) {
boolean rtcp;
switch (componentID) {
case Component.RTCP:
rtcp = true;
break;
case Component.RTP:
rtcp = false;
break;
default:
throw new IllegalStateException("componentID");
}
int cipher_key_length;
int cipher_salt_length;
int cipher;
int auth_function;
int auth_key_length;
int RTCP_auth_tag_length, RTP_auth_tag_length;
switch (srtpProtectionProfile) {
case SRTPProtectionProfile.SRTP_AES128_CM_HMAC_SHA1_32:
cipher_key_length = 128 / 8;
cipher_salt_length = 112 / 8;
cipher = SRTPPolicy.AESCM_ENCRYPTION;
auth_function = SRTPPolicy.HMACSHA1_AUTHENTICATION;
auth_key_length = 160 / 8;
RTCP_auth_tag_length = 80 / 8;
RTP_auth_tag_length = 32 / 8;
break;
case SRTPProtectionProfile.SRTP_AES128_CM_HMAC_SHA1_80:
cipher_key_length = 128 / 8;
cipher_salt_length = 112 / 8;
cipher = SRTPPolicy.AESCM_ENCRYPTION;
auth_function = SRTPPolicy.HMACSHA1_AUTHENTICATION;
auth_key_length = 160 / 8;
RTCP_auth_tag_length = RTP_auth_tag_length = 80 / 8;
break;
case SRTPProtectionProfile.SRTP_NULL_HMAC_SHA1_32:
cipher_key_length = 0;
cipher_salt_length = 0;
cipher = SRTPPolicy.NULL_ENCRYPTION;
auth_function = SRTPPolicy.HMACSHA1_AUTHENTICATION;
auth_key_length = 160 / 8;
RTCP_auth_tag_length = 80 / 8;
RTP_auth_tag_length = 32 / 8;
break;
case SRTPProtectionProfile.SRTP_NULL_HMAC_SHA1_80:
cipher_key_length = 0;
cipher_salt_length = 0;
cipher = SRTPPolicy.NULL_ENCRYPTION;
auth_function = SRTPPolicy.HMACSHA1_AUTHENTICATION;
auth_key_length = 160 / 8;
RTCP_auth_tag_length = RTP_auth_tag_length = 80 / 8;
break;
default:
throw new IllegalArgumentException("srtpProtectionProfile");
}
byte[] keyingMaterial =
tlsContext.exportKeyingMaterial(
ExporterLabel.dtls_srtp, null, 2 * (cipher_key_length + cipher_salt_length));
byte[] client_write_SRTP_master_key = new byte[cipher_key_length];
byte[] server_write_SRTP_master_key = new byte[cipher_key_length];
byte[] client_write_SRTP_master_salt = new byte[cipher_salt_length];
byte[] server_write_SRTP_master_salt = new byte[cipher_salt_length];
byte[][] keyingMaterialValues = {
client_write_SRTP_master_key,
server_write_SRTP_master_key,
client_write_SRTP_master_salt,
server_write_SRTP_master_salt
};
for (int i = 0, keyingMaterialOffset = 0; i < keyingMaterialValues.length; i++) {
byte[] keyingMaterialValue = keyingMaterialValues[i];
System.arraycopy(
keyingMaterial, keyingMaterialOffset, keyingMaterialValue, 0, keyingMaterialValue.length);
keyingMaterialOffset += keyingMaterialValue.length;
}
SRTPPolicy srtcpPolicy =
new SRTPPolicy(
cipher,
cipher_key_length,
auth_function,
auth_key_length,
RTCP_auth_tag_length,
cipher_salt_length);
SRTPPolicy srtpPolicy =
new SRTPPolicy(
cipher,
cipher_key_length,
auth_function,
auth_key_length,
RTP_auth_tag_length,
cipher_salt_length);
SRTPContextFactory clientSRTPContextFactory =
new SRTPContextFactory(
/* sender */ tlsContext instanceof TlsClientContext,
client_write_SRTP_master_key,
client_write_SRTP_master_salt,
srtpPolicy,
srtcpPolicy);
SRTPContextFactory serverSRTPContextFactory =
new SRTPContextFactory(
/* sender */ tlsContext instanceof TlsServerContext,
server_write_SRTP_master_key,
server_write_SRTP_master_salt,
srtpPolicy,
srtcpPolicy);
SRTPContextFactory forwardSRTPContextFactory;
SRTPContextFactory reverseSRTPContextFactory;
if (tlsContext instanceof TlsClientContext) {
forwardSRTPContextFactory = clientSRTPContextFactory;
reverseSRTPContextFactory = serverSRTPContextFactory;
} else if (tlsContext instanceof TlsServerContext) {
forwardSRTPContextFactory = serverSRTPContextFactory;
reverseSRTPContextFactory = clientSRTPContextFactory;
} else {
throw new IllegalArgumentException("tlsContext");
}
SinglePacketTransformer srtpTransformer;
if (rtcp) {
srtpTransformer = new SRTCPTransformer(forwardSRTPContextFactory, reverseSRTPContextFactory);
} else {
srtpTransformer = new SRTPTransformer(forwardSRTPContextFactory, reverseSRTPContextFactory);
}
return srtpTransformer;
}