Fix the timestamp unit for media codec encoder (#1091)

* Remove trailing zeros before putting frame into SDK

* Add unit test for removing trailing zeros

* Update KinesisVideoFrameTest.java

* Fix validation exception caused by request model update

* Add comment and update change log

* Fix the timestamp unit for media codec encoder

The presentation timestamp in microseconds for this buffer. This is normally the media time at which this buffer should be presented (rendered).
according to https://developer.android.com/reference/android/media/MediaCodec.html#queueInputBuffer(int,%20int,%20int,%20long,%20int)

* Add change log for time unit bug fix

Author: zhiyua-git

CHANGELOG.md

@@ -1,20 +1,19 @@
 # Change Log - AWS SDK for Android
 
-### Bug Fixes
-* **Amazon Kinesis Video**
-  * Fixed a bug when CreateStreamRequest is initialized without setting Tags, auto-generated empty HashMap of Tags would cause ValidationException from Kinesis Video.
-
 ## [Release 2.14.1](https://github.com/aws/aws-sdk-android/releases/tag/release_v2.14.1)
 
 ### Bug Fixes
-
 - **AWS Core Runtime**
   - Fixed response unmarshalling when response is gzip encoded without a CRC32 checksum. Also fixes bug decoding Kinesis responses with GZIP encoding.
+- **Amazon Kinesis Video**
+  - Fixed a bug when CreateStreamRequest is initialized without setting Tags, auto-generated empty HashMap of Tags would cause ValidationException from Kinesis Video.
+  - Fixed incorrect timestamp unit for encoder input caused high bitrate issue for the stream.
 
 ### Misc. Updates
 
 - Model updates for the following services
   - Amazon Comprehend
+  - Amazon Security Token Service (STS)
 
 ## [Release 2.14.0](https://github.com/aws/aws-sdk-android/releases/tag/release_v2.14.0)
 
@@ -1676,4 +1675,3 @@ All documentation is now centralized at https://aws-amplify.github.io/
 ### Bug Fixes
 - **Amazon S3**: Fixed an issue that occurs when required headers are not properly signed. This issue affects S3 in two regions: Frankfurt (eu-central-1) and China (cn-north-1). [#42](https://github.com/aws/aws-sdk-android/issues/42)
 - **AWS Core Runtime Library**: Fixed an issue in Maven distribution where an incorrect version string is set in "User-Agent".
-1

aws-android-sdk-kinesisvideo/src/main/java/com/amazonaws/mobileconnectors/kinesisvideo/encoding/EncoderFrameSubmitter.java

@@ -83,7 +83,7 @@
  *    - mic drop
  */
 public class EncoderFrameSubmitter {
-
+    private static final long NS_IN_US = 1000;
     private static final long NS_IN_MS = 1000000;
     private static final int FROM_START = 0;
     private static final int NO_FLAGS = 0;
@@ -101,14 +101,14 @@ public void submitFrameToEncoder(final Image frameImageYUV420,
 
         // encoders are super sensitive to the timestamps, careful here
         final long timestamp = nanosSinceFirstFrame();
-        queueIntoInputImage(frameImageYUV420, timestamp, endOfStream);
+        queueIntoInputImage(frameImageYUV420, timestamp / NS_IN_US, endOfStream);
     }
 
     /**
      * TLDR: read the above javadoc for the class
      */
     private void queueIntoInputImage(final Image frameImageYUV420,
-                                     final long timestamp,
+                                     final long timestampInUS,
                                      final boolean endOfStream) {
 
         final int flags = endOfStream ? MediaCodec.BUFFER_FLAG_END_OF_STREAM : NO_FLAGS;
@@ -126,7 +126,7 @@ private void queueIntoInputImage(final Image frameImageYUV420,
                 inputBufferIndex,
                 FROM_START,
                 tmpBufferSize,
-                timestamp,
+                timestampInUS,
                 flags);
     }