Add function for getting supported H264 level from max resolution and fps

webrtc/common_video/h264/profile_level_id_unittest.cc

 /*
  *  Copyright (c) 2016 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.
  */
 
@@ skipping 52 matching lines @@
 }
 
 TEST(H264ProfileLevelId, TestParsingHigh) {
   EXPECT_EQ(kProfileHigh, ParseProfileLevelId("64001f")->profile);
 }
 
 TEST(H264ProfileLevelId, TestParsingConstrainedHigh) {
   EXPECT_EQ(kProfileConstrainedHigh, ParseProfileLevelId("640c1f")->profile);
 }
 
+TEST(H264ProfileLevelId, TestSupportedLevel) {
+  EXPECT_EQ(kLevel2_1, *SupportedLevel(640 * 480, 25));
+  EXPECT_EQ(kLevel3_1, *SupportedLevel(1280 * 720, 30));
+  EXPECT_EQ(kLevel4_2, *SupportedLevel(1920 * 1280, 60));
+}
+
+// Test supported level below level 1 requirements.
+TEST(H264ProfileLevelId, TestSupportedLevelInvalid) {
+  EXPECT_FALSE(SupportedLevel(0, 0));
+  EXPECT_FALSE(SupportedLevel(1280 * 720, 5));
+  EXPECT_FALSE(SupportedLevel(183 * 137, 30));

[hta-webrtc, 2016/11/03 14:04:32]

Please add a comment as to why these resolution/frame combinations are unable to
support any level.

[magjed_webrtc, 2016/11/03 14:53:39]

Done.

+}
+
 TEST(H264ProfileLevelId, TestToString) {
   EXPECT_EQ("42e01f", ProfileLevelIdToString(ProfileLevelId(
                           kProfileConstrainedBaseline, kLevel3_1)));
   EXPECT_EQ("42000a",
             ProfileLevelIdToString(ProfileLevelId(kProfileBaseline, kLevel1)));
   EXPECT_EQ("4D001f",
             ProfileLevelIdToString(ProfileLevelId(kProfileMain, kLevel3_1)));
   EXPECT_EQ("640c2a", ProfileLevelIdToString(
                           ProfileLevelId(kProfileConstrainedHigh, kLevel4_2)));
   EXPECT_EQ("64002a",
@@ skipping 13 matching lines @@
   EXPECT_EQ("",
             ProfileLevelIdToString(ProfileLevelId(kProfileHigh, kLevel1_b)));
   EXPECT_EQ("", ProfileLevelIdToString(
                     ProfileLevelId(kProfileConstrainedHigh, kLevel1_b)));
   EXPECT_EQ("", ProfileLevelIdToString(
                     ProfileLevelId(static_cast<Profile>(255), kLevel3_1)));
 }
 
 }  // namespace H264
 }  // namespace webrtc