Add accessor methods for RTP timestamp of EncodedImage.

Intention is to make the member private, but downstream callers
must be updated to use the accessor methods first.

Bug: webrtc:9378
Change-Id: I3495bd8d545b7234fbea10abfd14f082caa420b6
Reviewed-on: https://webrtc-review.googlesource.com/82160
Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Reviewed-by: Sebastian Jansson <srte@webrtc.org>
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24352}
diff --git a/modules/video_coding/generic_encoder_unittest.cc b/modules/video_coding/generic_encoder_unittest.cc
index 6037381..c889769 100644
--- a/modules/video_coding/generic_encoder_unittest.cc
+++ b/modules/video_coding/generic_encoder_unittest.cc
@@ -94,7 +94,7 @@
       CodecSpecificInfo codec_specific;
       image._length = FrameSize(min_frame_size, max_frame_size, s, i);
       image.capture_time_ms_ = current_timestamp;
-      image._timeStamp = static_cast<uint32_t>(current_timestamp * 90);
+      image.SetTimestamp(static_cast<uint32_t>(current_timestamp * 90));
       codec_specific.codecType = kVideoCodecGeneric;
       codec_specific.codecSpecific.generic.simulcast_idx = s;
       callback.OnEncodeStarted(static_cast<uint32_t>(current_timestamp * 90),
@@ -187,7 +187,7 @@
   int64_t timestamp = 1;
   image._length = 500;
   image.capture_time_ms_ = timestamp;
-  image._timeStamp = static_cast<uint32_t>(timestamp * 90);
+  image.SetTimestamp(static_cast<uint32_t>(timestamp * 90));
   codec_specific.codecType = kVideoCodecGeneric;
   codec_specific.codecSpecific.generic.simulcast_idx = 0;
   FakeEncodedImageCallback sink;
@@ -204,7 +204,7 @@
 
   // New frame, now skip OnEncodeStarted. Should not result in timing frame.
   image.capture_time_ms_ = ++timestamp;
-  image._timeStamp = static_cast<uint32_t>(timestamp * 90);
+  image.SetTimestamp(static_cast<uint32_t>(timestamp * 90));
   callback.OnEncodedImage(image, &codec_specific, nullptr);
   EXPECT_FALSE(sink.WasTimingFrame());
 }
@@ -219,7 +219,7 @@
   int64_t timestamp = 1;
   image._length = 500;
   image.capture_time_ms_ = timestamp;
-  image._timeStamp = static_cast<uint32_t>(timestamp * 90);
+  image.SetTimestamp(static_cast<uint32_t>(timestamp * 90));
   codec_specific.codecType = kVideoCodecGeneric;
   codec_specific.codecSpecific.generic.simulcast_idx = 0;
   FakeEncodedImageCallback sink;
@@ -237,7 +237,7 @@
   // New frame, but this time with encode timestamps set in timing_.
   // This should be a timing frame.
   image.capture_time_ms_ = ++timestamp;
-  image._timeStamp = static_cast<uint32_t>(timestamp * 90);
+  image.SetTimestamp(static_cast<uint32_t>(timestamp * 90));
   image.timing_.encode_start_ms = timestamp + kEncodeStartDelayMs;
   image.timing_.encode_finish_ms = timestamp + kEncodeFinishDelayMs;
   callback.OnEncodedImage(image, &codec_specific, nullptr);
@@ -263,27 +263,27 @@
   // Any non-zero bitrate needed to be set before the first frame.
   callback.OnTargetBitrateChanged(500, 0);
   image.capture_time_ms_ = kTimestampMs1;
-  image._timeStamp = static_cast<uint32_t>(image.capture_time_ms_ * 90);
-  callback.OnEncodeStarted(image._timeStamp, image.capture_time_ms_, 0);
+  image.SetTimestamp(static_cast<uint32_t>(image.capture_time_ms_ * 90));
+  callback.OnEncodeStarted(image.Timestamp(), image.capture_time_ms_, 0);
   EXPECT_EQ(0u, sink.GetNumFramesDropped());
   callback.OnEncodedImage(image, &codec_specific, nullptr);
 
   image.capture_time_ms_ = kTimestampMs2;
-  image._timeStamp = static_cast<uint32_t>(image.capture_time_ms_ * 90);
-  callback.OnEncodeStarted(image._timeStamp, image.capture_time_ms_, 0);
+  image.SetTimestamp(static_cast<uint32_t>(image.capture_time_ms_ * 90));
+  callback.OnEncodeStarted(image.Timestamp(), image.capture_time_ms_, 0);
   // No OnEncodedImageCall for timestamp2. Yet, at this moment it's not known
   // that frame with timestamp2 was dropped.
   EXPECT_EQ(0u, sink.GetNumFramesDropped());
 
   image.capture_time_ms_ = kTimestampMs3;
-  image._timeStamp = static_cast<uint32_t>(image.capture_time_ms_ * 90);
-  callback.OnEncodeStarted(image._timeStamp, image.capture_time_ms_, 0);
+  image.SetTimestamp(static_cast<uint32_t>(image.capture_time_ms_ * 90));
+  callback.OnEncodeStarted(image.Timestamp(), image.capture_time_ms_, 0);
   callback.OnEncodedImage(image, &codec_specific, nullptr);
   EXPECT_EQ(1u, sink.GetNumFramesDropped());
 
   image.capture_time_ms_ = kTimestampMs4;
-  image._timeStamp = static_cast<uint32_t>(image.capture_time_ms_ * 90);
-  callback.OnEncodeStarted(image._timeStamp, image.capture_time_ms_, 0);
+  image.SetTimestamp(static_cast<uint32_t>(image.capture_time_ms_ * 90));
+  callback.OnEncodeStarted(image.Timestamp(), image.capture_time_ms_, 0);
   callback.OnEncodedImage(image, &codec_specific, nullptr);
   EXPECT_EQ(1u, sink.GetNumFramesDropped());
 }
@@ -299,8 +299,8 @@
   // Any non-zero bitrate needed to be set before the first frame.
   callback.OnTargetBitrateChanged(500, 0);
   image.capture_time_ms_ = kTimestampMs;  // Incorrect timesetamp.
-  image._timeStamp = static_cast<uint32_t>(image.capture_time_ms_ * 90);
-  callback.OnEncodeStarted(image._timeStamp, image.capture_time_ms_, 0);
+  image.SetTimestamp(static_cast<uint32_t>(image.capture_time_ms_ * 90));
+  callback.OnEncodeStarted(image.Timestamp(), image.capture_time_ms_, 0);
   image.capture_time_ms_ = 0;  // Incorrect timesetamp.
   callback.OnEncodedImage(image, &codec_specific, nullptr);
   EXPECT_EQ(kTimestampMs, sink.GetLastCaptureTimestamp());