Add sender controlled playout delay limits

webrtc/modules/video_coding/packet.cc

Index: webrtc/modules/video_coding/packet.cc
diff --git a/webrtc/modules/video_coding/packet.cc b/webrtc/modules/video_coding/packet.cc
index e8c06a69771e86aaaa57aacc8e9237ba455927ec..aa27c5da6b868c73e7fa6fe65b136314d3d7b706 100644
--- a/webrtc/modules/video_coding/packet.cc
+++ b/webrtc/modules/video_coding/packet.cc
@@ -32,7 +32,9 @@ VCMPacket::VCMPacket()
       insertStartCode(false),
       width(0),
       height(0),
-      codecSpecificHeader() {}
+      video_header() {
+  video_header.playout_delay = {-1, -1};
+}
 
 VCMPacket::VCMPacket(const uint8_t* ptr,
                      const size_t size,
@@ -45,7 +47,6 @@ VCMPacket::VCMPacket(const uint8_t* ptr,
       sizeBytes(size),
       markerBit(rtpHeader.header.markerBit),
       timesNacked(-1),
-
       frameType(rtpHeader.frameType),
       codec(kVideoCodecUnknown),
       isFirstPacket(rtpHeader.type.Video.isFirstPacket),
@@ -53,8 +54,18 @@ VCMPacket::VCMPacket(const uint8_t* ptr,
       insertStartCode(false),
       width(rtpHeader.type.Video.width),
       height(rtpHeader.type.Video.height),
-      codecSpecificHeader(rtpHeader.type.Video) {
+      video_header(rtpHeader.type.Video) {
   CopyCodecSpecifics(rtpHeader.type.Video);
+
+  if (markerBit) {
+    video_header.rotation = rtpHeader.type.Video.rotation;
+  }
+  // Playout decisions are made entirely based on first packet in a frame.
+  if (isFirstPacket) {
+    video_header.playout_delay = rtpHeader.type.Video.playout_delay;
+  } else {
+    video_header.playout_delay = {-1, -1};
+  }
 }
 
 VCMPacket::VCMPacket(const uint8_t* ptr,
@@ -70,7 +81,6 @@ VCMPacket::VCMPacket(const uint8_t* ptr,
       sizeBytes(size),
       markerBit(mBit),
       timesNacked(-1),
-
       frameType(kVideoFrameDelta),
       codec(kVideoCodecUnknown),
       isFirstPacket(false),
@@ -78,7 +88,7 @@ VCMPacket::VCMPacket(const uint8_t* ptr,
       insertStartCode(false),
       width(0),
       height(0),
-      codecSpecificHeader() {}
+      video_header() {}
 
 void VCMPacket::Reset() {
   payloadType = 0;
@@ -96,13 +106,10 @@ void VCMPacket::Reset() {
   insertStartCode = false;
   width = 0;
   height = 0;
-  memset(&codecSpecificHeader, 0, sizeof(RTPVideoHeader));
+  memset(&video_header, 0, sizeof(RTPVideoHeader));
 }
 
 void VCMPacket::CopyCodecSpecifics(const RTPVideoHeader& videoHeader) {
-  if (markerBit) {
-    codecSpecificHeader.rotation = videoHeader.rotation;
-  }
   switch (videoHeader.codec) {
     case kRtpVideoVp8:
       // Handle all packets within a frame as depending on the previous packet