--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jlibrtp/RtcpPktPSFB.java Sat Mar 14 22:15:41 2009 +0100
@@ -0,0 +1,395 @@
+/**
+ * Java RTP Library (jlibrtp)
+ * Copyright (C) 2006 Arne Kepp
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+package jlibrtp;
+
+/**
+ * RTCP packets for Payload-Specific Feedback Messages
+ *
+ * @author Arne Kepp
+ */
+public class RtcpPktPSFB extends RtcpPkt {
+ /** If this packet was for a different SSRC */
+ protected boolean notRelevant = false;
+ /** Parent RTP Session */
+ private RTPSession rtpSession;
+ /** SSRC we are sending feeback to */
+ protected long ssrcMediaSource = -1;
+
+ /** SLI macroblock (MB) address of the first lost macroblock number */
+ protected int[] sliFirst;
+ /** SLI number of lost macroblocks */
+ protected int[] sliNumber;
+ /** SLI six least significant bits of the codec-specific identifier */
+ protected int[] sliPictureId;
+
+ // Picture loss indication
+ /** RPSI number of padded bits at end of bitString */
+ protected int rpsiPadding = -1;
+ /** RPSI payloadType RTP payload type */
+ protected int rpsiPayloadType = -1;
+ /** RPSI information as natively defined by the video codec */
+ protected byte[] rpsiBitString;
+
+ /** Application Layer Feedback Message */
+ protected byte[] alfBitString;
+
+ /**
+ * Generic constructor, then call make<something>
+ *
+ * @param ssrcPacketSender
+ * @param ssrcMediaSource
+ */
+ protected RtcpPktPSFB(long ssrcPacketSender, long ssrcMediaSource) {
+ super.ssrc = ssrcPacketSender;
+ this.ssrcMediaSource = ssrcMediaSource;
+ super.packetType = 206; //PSFB
+ }
+
+ /**
+ * Make this packet a Picture loss indication
+ */
+ protected void makePictureLossIndication() {
+ super.itemCount = 1; //FMT
+ }
+
+ /**
+ * Make this packet a Slice Loss Indication
+ *
+ * @param sliFirst macroblock (MB) address of the first lost macroblock
+ * @param sliNumber number of lost macroblocks
+ * @param sliPictureId six least significant bits of the codec-specific identifier
+ */
+ protected void makeSliceLossIndication(int[] sliFirst, int[] sliNumber, int[] sliPictureId) {
+ super.itemCount = 2; //FMT
+ this.sliFirst = sliFirst;
+ this.sliNumber = sliNumber;
+ this.sliPictureId = sliPictureId;
+ }
+
+ /**
+ * Make this packet a Reference Picture Selection Indication
+ *
+ * @param bitPadding number of padded bits at end of bitString
+ * @param payloadType RTP payload type for codec
+ * @param bitString RPSI information as natively defined by the video codec
+ */
+ protected void makeRefPictureSelIndic(int bitPadding, int payloadType, byte[] bitString) {
+ super.itemCount = 3; //FMT
+ this.rpsiPadding = bitPadding;
+ this.rpsiPayloadType = payloadType;
+ this.rpsiBitString = bitString;
+ }
+
+ /**
+ * Make this packet an Application specific feedback message
+ *
+ * @param bitString the original application message
+ */
+ protected void makeAppLayerFeedback(byte[] bitString) {
+ super.itemCount = 15; //FMT
+ this.alfBitString = bitString;
+ }
+
+ /**
+ * Constructor that parses a raw packet to retrieve information
+ *
+ * @param aRawPkt the raw packet to be parsed
+ * @param start the start of the packet, in bytes
+ * @param rtpSession the session on which the callback interface resides
+ */
+ protected RtcpPktPSFB(byte[] aRawPkt, int start, RTPSession rtpSession) {
+ if(RTPSession.rtpDebugLevel > 8) {
+ System.out.println(" -> RtcpPktPSFB(byte[], int start)");
+ }
+ this.rtpSession = rtpSession;
+
+ rawPkt = aRawPkt;
+
+ if(! super.parseHeaders(start) || packetType != 206 || super.length < 2 ) {
+ if(RTPSession.rtpDebugLevel > 2) {
+ System.out.println(" <-> RtcpPktRTPFB.parseHeaders() etc. problem");
+ }
+ super.problem = -206;
+ } else {
+ //FMT = super.itemCount;
+ ssrcMediaSource = StaticProcs.bytesToUIntLong(aRawPkt,8+start);
+
+ if(ssrcMediaSource == rtpSession.ssrc) {
+ super.ssrc = StaticProcs.bytesToUIntLong(aRawPkt,4+start);
+
+ switch(super.itemCount) {
+ case 1: // Picture Loss Indication
+ decPictureLossIndic();
+ break;
+ case 2: // Slice Loss Indication
+ decSliceLossIndic(aRawPkt, start + 12);
+ break;
+ case 3: // Reference Picture Selection Indication
+ decRefPictureSelIndic(aRawPkt, start + 12);
+ break;
+ case 15: // Application Layer Feedback Messages
+ decAppLayerFB(aRawPkt, start + 12);
+ break;
+ default:
+ System.out.println("!!!! RtcpPktPSFB(byte[], int start) unexpected FMT " + super.itemCount);
+ }
+ } else {
+ this.notRelevant = true;
+ }
+ }
+ if(RTPSession.rtpDebugLevel > 8) {
+ System.out.println(" <- RtcpPktPSFB()");
+ }
+ }
+
+ /**
+ * Decode Picture Loss indication
+ *
+ */
+ private void decPictureLossIndic() {
+ if(this.rtpSession.rtcpAVPFIntf != null) {
+ this.rtpSession.rtcpAVPFIntf.PSFBPktPictureLossReceived(
+ super.ssrc);
+ }
+ }
+
+ /**
+ * Decode Slice Loss Indication
+ *
+ * @param aRawPkt
+ * @param start
+ */
+ private void decSliceLossIndic(byte[] aRawPkt, int start) {
+ // 13 bit off-boundary numbers? That's rather cruel
+ // 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ // | First | Number | PictureID |
+ // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+ int count = super.length - 2;
+
+ sliFirst = new int[count];
+ sliNumber = new int[count];
+ sliPictureId = new int[count];
+
+ // Loop over the FCI lines
+ for(int i=0; i < count; i++) {
+ sliFirst[i] = StaticProcs.bytesToUIntInt(aRawPkt, start) >> 3;
+ sliNumber[i] = (int) (StaticProcs.bytesToUIntInt(aRawPkt, start) & 0x0007FFC0) >> 6;
+ sliPictureId[i] = (StaticProcs.bytesToUIntInt(aRawPkt, start + 2) & 0x003F);
+ start += 4;
+ }
+
+ if(this.rtpSession.rtcpAVPFIntf != null) {
+ this.rtpSession.rtcpAVPFIntf.PSFBPktSliceLossIndic(
+ super.ssrc,
+ sliFirst, sliNumber, sliPictureId);
+ }
+ }
+
+ /**
+ * Decode Reference Picture Selection Indication
+ *
+ * @param aRawPkt
+ * @param start
+ */
+ private void decRefPictureSelIndic(byte[] aRawPkt, int start) {
+ // 0 1 2 3
+ // 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ // | PB |0| Payload Type| Native RPSI bit string |
+ // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ // | defined per codec ... | Padding (0) |
+ // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+ rpsiPadding = aRawPkt[start];
+
+ if(rpsiPadding > 32) {
+ System.out.println("!!!! RtcpPktPSFB.decRefPictureSelcIndic paddingBits: "
+ + rpsiPadding);
+ }
+
+ rpsiPayloadType = (int) rawPkt[start];
+ if(rpsiPayloadType < 0) {
+ System.out.println("!!!! RtcpPktPSFB.decRefPictureSelcIndic 8th bit not zero: "
+ + rpsiPayloadType);
+ }
+
+ rpsiBitString = new byte[(super.length - 2)*4 - 2];
+ System.arraycopy(aRawPkt, start + 2, rpsiBitString, 0, rpsiBitString.length);
+
+ if(this.rtpSession.rtcpAVPFIntf != null) {
+ this.rtpSession.rtcpAVPFIntf.PSFBPktRefPictureSelIndic(
+ super.ssrc,
+ rpsiPayloadType, rpsiBitString, rpsiPadding);
+ }
+
+ }
+
+ /**
+ * Decode Application specific feedback message
+ *
+ * @param aRawPkt
+ * @param start
+ */
+ private void decAppLayerFB(byte[] aRawPkt, int start) {
+ //Application Message (FCI): variable length
+ int stringLength = (super.length - 2)*4;
+
+ alfBitString = new byte[stringLength];
+
+ System.arraycopy(aRawPkt, start, alfBitString, 0, stringLength);
+
+ if(this.rtpSession.rtcpAVPFIntf != null) {
+ this.rtpSession.rtcpAVPFIntf.PSFBPktAppLayerFBReceived(
+ super.ssrc, alfBitString);
+ }
+ }
+
+
+
+ /**
+ * Encode a Slice Loss Indication
+ */
+ private void encSliceLossIndic() {
+ byte[] firstBytes;
+ byte[] numbBytes;
+ byte[] picBytes;
+
+ int offset = 8;
+ // Loop over the FCI lines
+ for(int i=0; i < sliFirst.length; i++) {
+ offset = 8 + 8*i;
+ firstBytes = StaticProcs.uIntLongToByteWord(sliFirst[i] << 3);
+ numbBytes = StaticProcs.uIntLongToByteWord(sliNumber[i] << 2);
+ picBytes = StaticProcs.uIntIntToByteWord(sliPictureId[i]);
+
+ super.rawPkt[offset] = firstBytes[2];
+ super.rawPkt[offset+1] = (byte) (firstBytes[3] | numbBytes[2]);
+ super.rawPkt[offset+2] = numbBytes[3];
+ super.rawPkt[offset+3] = (byte) (numbBytes[3] | picBytes[1]);
+ }
+ }
+
+ /**
+ * Encode a Reference Picture Selection Indication
+ *
+ */
+ private void encRefPictureSelIndic() {
+ byte[] someBytes;
+ someBytes = StaticProcs.uIntIntToByteWord(rpsiPadding);
+ super.rawPkt[8] = someBytes[1];
+ someBytes = StaticProcs.uIntIntToByteWord(rpsiPayloadType);
+ super.rawPkt[9] = someBytes[1];
+
+ System.arraycopy(rpsiBitString, 0, super.rawPkt, 10, rpsiBitString.length);
+ }
+
+
+ /**
+ * Encode Application Layer Feedback
+ *
+ */
+ private void encAppLayerFB() {
+ //Application Message (FCI): variable length
+ System.arraycopy(alfBitString, 0, super.rawPkt, 8, alfBitString.length);
+ }
+
+ /**
+ * Get the FMT (Feedback Message Type)
+ * @return value stored in .itemcount, same field
+ */
+ protected int getFMT() {
+ return this.itemCount;
+ }
+
+ /**
+ * Encode the packet into a byte[], saved in .rawPkt
+ *
+ * CompRtcpPkt will call this automatically
+ */
+ protected void encode() {
+ switch(super.itemCount) {
+ case 1: // Picture Loss Indication
+ //Nothing to do really
+ super.rawPkt = new byte[24];
+ break;
+ case 2: // Slice Loss Indication
+ super.rawPkt = new byte[24 + 4*this.sliFirst.length];
+ encSliceLossIndic();
+ break;
+ case 3: // Reference Picture Selection Indication
+ super.rawPkt = new byte[24 + 2 + this.rpsiBitString.length/4];
+ encRefPictureSelIndic();
+ break;
+ case 15: // Application Layer Feedback Messages
+ super.rawPkt = new byte[24 + this.alfBitString.length/4];
+ encAppLayerFB();
+ break;
+ }
+
+ byte[] someBytes = StaticProcs.uIntLongToByteWord(super.ssrc);
+ System.arraycopy(someBytes, 0, super.rawPkt, 4, 4);
+ someBytes = StaticProcs.uIntLongToByteWord(this.ssrcMediaSource);
+ System.arraycopy(someBytes, 0, super.rawPkt, 8, 4);
+
+ writeHeaders();
+ }
+
+ /**
+ * Debug purposes only
+ */
+ public void debugPrint() {
+ System.out.println("->RtcpPktPSFB.debugPrint() ");
+
+ String str;
+ switch(super.itemCount) {
+ case 1: // Picture Loss Indication
+ System.out.println(" FMT: Picture Loss Indication");
+ break;
+ case 2: // Slice Loss Indication
+ if(sliFirst != null) {
+ str = "sliFirst[].length: " + sliFirst.length;
+ } else {
+ str = "sliFirst[] is null";
+ }
+ System.out.println(" FMT: Slice Loss Indication, " + str);
+ break;
+ case 3: // Reference Picture Selection Indication
+ if(rpsiBitString != null) {
+ str = "rpsiBitString[].length: " + rpsiBitString.length;
+ } else {
+ str = "rpsiBitString[] is null";
+ }
+ System.out.println(" FMT: Reference Picture Selection Indication, "
+ + str + " payloadType: " + this.rpsiPayloadType);
+ break;
+ case 15: // Application Layer Feedback Messages
+ if(alfBitString != null) {
+ str = "alfBitString[].length: " + alfBitString.length;
+ } else {
+ str = "alfBitString[] is null";
+ }
+ System.out.println(" FMT: Application Layer Feedback Messages, " + str);
+ break;
+ }
+
+ System.out.println("<-RtcpPktPSFB.debugPrint() ");
+ }
+}