Added is_last_packet_in_frame to match is_first_packet_in_frame.

Today we use |is_first_packet_in_frame| to know when a frame begins and the
|markerBit| to know when it ends, but the markerbit does not actually mark the
end of a frame, it marks the end of a picture.

Bug: webrtc:9361
Change-Id: Icc70e6075590cdc31e875a4eb9d489868adbb67c
Reviewed-on: https://webrtc-review.googlesource.com/100160
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Philip Eliasson <philipel@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24722}
diff --git a/modules/video_coding/frame_object.cc b/modules/video_coding/frame_object.cc
index 4f7724d..32b0cc1 100644
--- a/modules/video_coding/frame_object.cc
+++ b/modules/video_coding/frame_object.cc
@@ -72,7 +72,7 @@
 
   VCMPacket* last_packet = packet_buffer_->GetPacket(last_seq_num);
   RTC_CHECK(last_packet);
-  RTC_CHECK(last_packet->markerBit);
+  RTC_CHECK(last_packet->is_last_packet_in_frame);
   // http://www.etsi.org/deliver/etsi_ts/126100_126199/126114/12.07.00_60/
   // ts_126114v120700p.pdf Section 7.4.5.
   // The MTSI client shall add the payload bytes as defined in this clause
diff --git a/modules/video_coding/packet.cc b/modules/video_coding/packet.cc
index 691ec62..dea72cb 100644
--- a/modules/video_coding/packet.cc
+++ b/modules/video_coding/packet.cc
@@ -28,6 +28,7 @@
       frameType(kEmptyFrame),
       codec(kVideoCodecGeneric),
       is_first_packet_in_frame(false),
+      is_last_packet_in_frame(false),
       completeNALU(kNaluUnset),
       insertStartCode(false),
       width(0),
@@ -52,6 +53,7 @@
       codec(rtpHeader.video_header().codec),
       is_first_packet_in_frame(
           rtpHeader.video_header().is_first_packet_in_frame),
+      is_last_packet_in_frame(rtpHeader.video_header().is_last_packet_in_frame),
       completeNALU(kNaluIncomplete),
       insertStartCode(rtpHeader.video_header().codec == kVideoCodecH264 &&
                       rtpHeader.video_header().is_first_packet_in_frame),
diff --git a/modules/video_coding/packet.h b/modules/video_coding/packet.h
index 80a39ca..09ab983 100644
--- a/modules/video_coding/packet.h
+++ b/modules/video_coding/packet.h
@@ -36,6 +36,7 @@
   VideoCodecType codec;
 
   bool is_first_packet_in_frame;
+  bool is_last_packet_in_frame;
   VCMNaluCompleteness completeNALU;  // Default is kNaluIncomplete.
   bool insertStartCode;  // True if a start code should be inserted before this
                          // packet.
diff --git a/modules/video_coding/packet_buffer.cc b/modules/video_coding/packet_buffer.cc
index e1172b3..fe93fb3 100644
--- a/modules/video_coding/packet_buffer.cc
+++ b/modules/video_coding/packet_buffer.cc
@@ -107,7 +107,7 @@
     }
 
     sequence_buffer_[index].frame_begin = packet->is_first_packet_in_frame;
-    sequence_buffer_[index].frame_end = packet->markerBit;
+    sequence_buffer_[index].frame_end = packet->is_last_packet_in_frame;
     sequence_buffer_[index].seq_num = packet->seqNum;
     sequence_buffer_[index].continuous = false;
     sequence_buffer_[index].frame_created = false;
diff --git a/modules/video_coding/rtp_frame_reference_finder_unittest.cc b/modules/video_coding/rtp_frame_reference_finder_unittest.cc
index 63c94ed..50a8779 100644
--- a/modules/video_coding/rtp_frame_reference_finder_unittest.cc
+++ b/modules/video_coding/rtp_frame_reference_finder_unittest.cc
@@ -88,7 +88,7 @@
     ref_packet_buffer_->InsertPacket(&packet);
 
     packet.seqNum = seq_num_end;
-    packet.markerBit = true;
+    packet.is_last_packet_in_frame = true;
     ref_packet_buffer_->InsertPacket(&packet);
 
     std::unique_ptr<RtpFrameObject> frame(new RtpFrameObject(
@@ -106,7 +106,7 @@
     VCMPacket packet;
     packet.codec = kVideoCodecVP8;
     packet.seqNum = seq_num_start;
-    packet.markerBit = (seq_num_start == seq_num_end);
+    packet.is_last_packet_in_frame = (seq_num_start == seq_num_end);
     packet.frameType = keyframe ? kVideoFrameKey : kVideoFrameDelta;
     auto& vp8_header =
         packet.video_header.video_type_header.emplace<RTPVideoHeaderVP8>();
@@ -118,7 +118,7 @@
 
     if (seq_num_start != seq_num_end) {
       packet.seqNum = seq_num_end;
-      packet.markerBit = true;
+      packet.is_last_packet_in_frame = true;
       ref_packet_buffer_->InsertPacket(&packet);
     }
 
@@ -142,7 +142,7 @@
     packet.timestamp = pid;
     packet.codec = kVideoCodecVP9;
     packet.seqNum = seq_num_start;
-    packet.markerBit = (seq_num_start == seq_num_end);
+    packet.is_last_packet_in_frame = (seq_num_start == seq_num_end);
     packet.frameType = keyframe ? kVideoFrameKey : kVideoFrameDelta;
     vp9_header.flexible_mode = false;
     vp9_header.picture_id = pid % (1 << 15);
@@ -157,7 +157,7 @@
     ref_packet_buffer_->InsertPacket(&packet);
 
     if (seq_num_start != seq_num_end) {
-      packet.markerBit = true;
+      packet.is_last_packet_in_frame = true;
       vp9_header.ss_data_available = false;
       packet.seqNum = seq_num_end;
       ref_packet_buffer_->InsertPacket(&packet);
@@ -182,7 +182,7 @@
     packet.timestamp = pid;
     packet.codec = kVideoCodecVP9;
     packet.seqNum = seq_num_start;
-    packet.markerBit = (seq_num_start == seq_num_end);
+    packet.is_last_packet_in_frame = (seq_num_start == seq_num_end);
     packet.frameType = keyframe ? kVideoFrameKey : kVideoFrameDelta;
     vp9_header.inter_layer_predicted = inter;
     vp9_header.flexible_mode = true;
@@ -197,7 +197,7 @@
 
     if (seq_num_start != seq_num_end) {
       packet.seqNum = seq_num_end;
-      packet.markerBit = true;
+      packet.is_last_packet_in_frame = true;
       ref_packet_buffer_->InsertPacket(&packet);
     }
 
diff --git a/modules/video_coding/video_packet_buffer_unittest.cc b/modules/video_coding/video_packet_buffer_unittest.cc
index f588026..50f5a5c 100644
--- a/modules/video_coding/video_packet_buffer_unittest.cc
+++ b/modules/video_coding/video_packet_buffer_unittest.cc
@@ -68,7 +68,7 @@
     packet.frameType =
         keyframe == kKeyFrame ? kVideoFrameKey : kVideoFrameDelta;
     packet.is_first_packet_in_frame = first == kFirst;
-    packet.markerBit = last == kLast;
+    packet.is_last_packet_in_frame = last == kLast;
     packet.sizeBytes = data_size;
     packet.dataPtr = data;
 
@@ -157,7 +157,7 @@
   packet.seqNum = seq_num;
   packet.frameType = kVideoFrameKey;
   packet.is_first_packet_in_frame = true;
-  packet.markerBit = false;
+  packet.is_last_packet_in_frame = false;
   packet.timesNacked = 0;
 
   packet_buffer_->InsertPacket(&packet);
@@ -172,7 +172,7 @@
   packet_buffer_->InsertPacket(&packet);
 
   packet.seqNum++;
-  packet.markerBit = true;
+  packet.is_last_packet_in_frame = true;
   packet.timesNacked = 1;
   packet_buffer_->InsertPacket(&packet);
 
@@ -524,7 +524,7 @@
       }
     }
     packet.is_first_packet_in_frame = first == kFirst;
-    packet.markerBit = last == kLast;
+    packet.is_last_packet_in_frame = last == kLast;
     packet.sizeBytes = data_size;
     packet.dataPtr = data;
 
@@ -605,7 +605,7 @@
   packet.dataPtr = data;
   packet.sizeBytes = sizeof(data_data);
   packet.is_first_packet_in_frame = true;
-  packet.markerBit = true;
+  packet.is_last_packet_in_frame = true;
   packet_buffer_->InsertPacket(&packet);
 
   ASSERT_EQ(1UL, frames_from_callback_.size());
@@ -748,7 +748,7 @@
 TEST_F(TestPacketBuffer, IncomingCodecChange) {
   VCMPacket packet;
   packet.is_first_packet_in_frame = true;
-  packet.markerBit = true;
+  packet.is_last_packet_in_frame = true;
   packet.sizeBytes = 0;
   packet.dataPtr = nullptr;
 
@@ -783,7 +783,7 @@
   packet.seqNum = 1;
   packet.frameType = kVideoFrameKey;
   packet.is_first_packet_in_frame = true;
-  packet.markerBit = true;
+  packet.is_last_packet_in_frame = true;
   auto& h264_header =
       packet.video_header.video_type_header.emplace<RTPVideoHeaderH264>();
   h264_header.nalus_length = kMaxNalusPerPacket;
@@ -867,7 +867,7 @@
     packet_.seqNum = kSeqNum;
 
     packet_.is_first_packet_in_frame = true;
-    packet_.markerBit = true;
+    packet_.is_last_packet_in_frame = true;
   }
 
   VCMPacket packet_;