Remove internal video codec methods from global namespace.

sdk/objc/Framework/Classes/VideoToolbox/RTCVideoEncoderH264.mm

 /*
  *  Copyright (c) 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.
  *
  */
@@ skipping 31 matching lines @@
            sampleBuffer:(CMSampleBufferRef)sampleBuffer
       codecSpecificInfo:(id<RTCCodecSpecificInfo>)codecSpecificInfo
                   width:(int32_t)width
                  height:(int32_t)height
            renderTimeMs:(int64_t)renderTimeMs
               timestamp:(uint32_t)timestamp
                rotation:(RTCVideoRotation)rotation;
 
 @end
 
+namespace {  // anonymous namespace
+
 // The ratio between kVTCompressionPropertyKey_DataRateLimits and
 // kVTCompressionPropertyKey_AverageBitRate. The data rate limit is set higher
 // than the average bit rate to avoid undershooting the target.
 const float kLimitToAverageBitRateFactor = 1.5f;
 // These thresholds deviate from the default h264 QP thresholds, as they
 // have been found to work better on devices that support VideoToolbox
 const int kLowH264QpThreshold = 28;
 const int kHighH264QpThreshold = 39;
 
 // Struct that we pass to the encoder per frame to encode. We receive it again
@@ skipping 199 matching lines @@
         case webrtc::H264::kLevel1_1:
         case webrtc::H264::kLevel1_2:
         case webrtc::H264::kLevel1_3:
         case webrtc::H264::kLevel2:
         case webrtc::H264::kLevel2_1:
         case webrtc::H264::kLevel2_2:
           return kVTProfileLevel_H264_High_AutoLevel;
       }
   }
 }
+}  // namespace
 
 @implementation RTCVideoEncoderH264 {
   RTCVideoCodecInfo *_codecInfo;
   webrtc::BitrateAdjuster *_bitrateAdjuster;
   uint32_t _targetBitrateBps;
   uint32_t _encoderBitrateBps;
   RTCH264PacketizationMode _packetizationMode;
   CFStringRef _profile;
   RTCVideoEncoderCallback _callback;
   int32_t _width;
@@ skipping 423 matching lines @@
   }
   _bitrateAdjuster->Update(frame.buffer.length);
 }
 
 - (RTCVideoEncoderQpThresholds *)scalingSettings {
   return [[RTCVideoEncoderQpThresholds alloc] initWithThresholdsLow:kLowH264QpThreshold
                                                                high:kHighH264QpThreshold];
 }
 
 @end