commit 50b1e6b760b267b646ee7a15db20671d82e0d9a9
author Elad Alon <eladalon@webrtc.org> Thu Oct 18 11:43:35 2018
committer Commit Bot <commit-bot@chromium.org> Thu Oct 18 13:51:05 2018
tree 54cbc15d3c38f828d8b2949d6d07507ec1ee76fe
parent 608298b6aeca37c35b757fefaf34e41f3ba7df3c

Add fixed-size delta-encoding/decoding code for WebRTC event logs

Add code for delta-encoding and decoding, to be used when producing
WebRTC event logs of the new format.

This CL supports fixed-size encoding only. Also, no support for
signed deltas or optional values yet. These will be added in
subsequent CLs.

Bug: webrtc:8111
Change-Id: I531abd99fd924f4c9e692abe565bc6f66c875ad5
Reviewed-on: https://webrtc-review.googlesource.com/c/100304
Reviewed-by: Björn Terelius <terelius@webrtc.org>
Commit-Queue: Elad Alon <eladalon@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25256}

logging/BUILD.gn

diff --git a/logging/BUILD.gn b/logging/BUILD.gn
index 3296906..91c560f 100644
--- a/logging/BUILD.gn
+++ b/logging/BUILD.gn
@@ -156,6 +156,8 @@
 rtc_static_library("rtc_event_log_impl_encoder") {
   visibility = [ "*" ]
   sources = [
+    "rtc_event_log/encoder/delta_encoding.cc",
+    "rtc_event_log/encoder/delta_encoding.h",
     "rtc_event_log/encoder/rtc_event_log_encoder_legacy.cc",
     "rtc_event_log/encoder/rtc_event_log_encoder_legacy.h",
   ]
@@ -177,6 +179,7 @@
     "../modules/rtp_rtcp:rtp_rtcp_format",
     "../rtc_base:checks",
     "../rtc_base:rtc_base_approved",
+    "//third_party/abseil-cpp/absl/memory",
   ]
 
   if (rtc_enable_protobuf) {
@@ -299,6 +302,7 @@
       assert(rtc_enable_protobuf)
       defines = [ "ENABLE_RTC_EVENT_LOG" ]
       sources = [
+        "rtc_event_log/encoder/delta_encoding_unittest.cc",
         "rtc_event_log/encoder/rtc_event_log_encoder_unittest.cc",
         "rtc_event_log/output/rtc_event_log_output_file_unittest.cc",
         "rtc_event_log/rtc_event_log_unittest.cc",