Put iOS H264 High profile under a field trial

webrtc/sdk/objc/Framework/Classes/videotoolboxvideocodecfactory.cc

 /*
  *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 #include "webrtc/sdk/objc/Framework/Classes/videotoolboxvideocodecfactory.h"
 
 #include "webrtc/base/logging.h"
 #include "webrtc/common_video/h264/profile_level_id.h"
 #include "webrtc/media/base/codec.h"
+#include "webrtc/sdk/objc/Framework/Classes/h264_video_toolbox_decoder.h"
 #include "webrtc/sdk/objc/Framework/Classes/h264_video_toolbox_encoder.h"
-#include "webrtc/sdk/objc/Framework/Classes/h264_video_toolbox_decoder.h"
+#include "webrtc/system_wrappers/include/field_trial.h"
 
 namespace webrtc {
 
+namespace {
+const char kHighProfileExperiment[] = "WebRTC-H264HighProfile";
+
+bool IsHighProfileEnabled() {
+  return field_trial::FindFullName(kHighProfileExperiment) == "Enabled";
+}
+}
+
 // VideoToolboxVideoEncoderFactory
 
 VideoToolboxVideoEncoderFactory::VideoToolboxVideoEncoderFactory() {
-  // TODO(magjed): Enumerate actual level instead of using hardcoded level 3.1.
-  // Level 3.1 is 1280x720@30fps which is enough for now.
-  const H264::Level level = H264::kLevel3_1;
-
-  cricket::VideoCodec constrained_high(cricket::kH264CodecName);
-  const H264::ProfileLevelId constrained_high_profile(
-      H264::kProfileConstrainedHigh, level);
-  constrained_high.SetParam(
-      cricket::kH264FmtpProfileLevelId,
-      *H264::ProfileLevelIdToString(constrained_high_profile));
-  constrained_high.SetParam(cricket::kH264FmtpLevelAsymmetryAllowed, "1");
-  constrained_high.SetParam(cricket::kH264FmtpPacketizationMode, "1");
-  supported_codecs_.push_back(constrained_high);
-
-  cricket::VideoCodec constrained_baseline(cricket::kH264CodecName);
-  const H264::ProfileLevelId constrained_baseline_profile(
-      H264::kProfileConstrainedBaseline, level);
-  constrained_baseline.SetParam(
-      cricket::kH264FmtpProfileLevelId,
-      *H264::ProfileLevelIdToString(constrained_baseline_profile));
-  constrained_baseline.SetParam(cricket::kH264FmtpLevelAsymmetryAllowed, "1");
-  constrained_baseline.SetParam(cricket::kH264FmtpPacketizationMode, "1");
-  supported_codecs_.push_back(constrained_baseline);
 }
 
 VideoToolboxVideoEncoderFactory::~VideoToolboxVideoEncoderFactory() {}
 
 VideoEncoder* VideoToolboxVideoEncoderFactory::CreateVideoEncoder(
     const cricket::VideoCodec& codec) {
   if (FindMatchingCodec(supported_codecs_, codec)) {
     LOG(LS_INFO) << "Creating HW encoder for " << codec.name;
     return new H264VideoToolboxEncoder(codec);
   }
   LOG(LS_INFO) << "No HW encoder found for codec " << codec.name;
   return nullptr;
 }
 
 void VideoToolboxVideoEncoderFactory::DestroyVideoEncoder(
     VideoEncoder* encoder) {
   delete encoder;
   encoder = nullptr;
 }
 
 const std::vector<cricket::VideoCodec>&
 VideoToolboxVideoEncoderFactory::supported_codecs() const {
+  supported_codecs_.clear();
+
+  // TODO(magjed): Enumerate actual level instead of using hardcoded level 3.1.
+  // Level 3.1 is 1280x720@30fps which is enough for now.
+  const H264::Level level = H264::kLevel3_1;
+
+  if (IsHighProfileEnabled()) {
+    cricket::VideoCodec constrained_high(cricket::kH264CodecName);
+    const H264::ProfileLevelId constrained_high_profile(
+        H264::kProfileConstrainedHigh, level);
+    constrained_high.SetParam(
+        cricket::kH264FmtpProfileLevelId,
+        *H264::ProfileLevelIdToString(constrained_high_profile));
+    constrained_high.SetParam(cricket::kH264FmtpLevelAsymmetryAllowed, "1");
+    constrained_high.SetParam(cricket::kH264FmtpPacketizationMode, "1");
+    supported_codecs_.push_back(constrained_high);
+  }
+
+  cricket::VideoCodec constrained_baseline(cricket::kH264CodecName);
+  const H264::ProfileLevelId constrained_baseline_profile(
+      H264::kProfileConstrainedBaseline, level);
+  constrained_baseline.SetParam(
+      cricket::kH264FmtpProfileLevelId,
+      *H264::ProfileLevelIdToString(constrained_baseline_profile));
+  constrained_baseline.SetParam(cricket::kH264FmtpLevelAsymmetryAllowed, "1");
+  constrained_baseline.SetParam(cricket::kH264FmtpPacketizationMode, "1");
+  supported_codecs_.push_back(constrained_baseline);
+
   return supported_codecs_;
 }
 
 // VideoToolboxVideoDecoderFactory
 
 VideoToolboxVideoDecoderFactory::VideoToolboxVideoDecoderFactory() {
   supported_codecs_.push_back(cricket::VideoCodec("H264"));
 }
 
 VideoToolboxVideoDecoderFactory::~VideoToolboxVideoDecoderFactory() {}
@@ skipping 14 matching lines @@
   return nullptr;
 }
 
 void VideoToolboxVideoDecoderFactory::DestroyVideoDecoder(
     VideoDecoder* decoder) {
   delete decoder;
   decoder = nullptr;
 }
 
 }  // namespace webrtc