Implement H264 codec in Objective-C classes.

webrtc/sdk/objc/Framework/Headers/WebRTC/RTCVideoCodec.h

Index: webrtc/sdk/objc/Framework/Headers/WebRTC/RTCVideoCodec.h
diff --git a/webrtc/sdk/objc/Framework/Headers/WebRTC/RTCVideoCodec.h b/webrtc/sdk/objc/Framework/Headers/WebRTC/RTCVideoCodec.h
index f093049faf8309a808732f729f7564bc4168a15f..5006065649d1f928cc8c86a178c2e58aa2c836c3 100644
--- a/webrtc/sdk/objc/Framework/Headers/WebRTC/RTCVideoCodec.h
+++ b/webrtc/sdk/objc/Framework/Headers/WebRTC/RTCVideoCodec.h
@@ -18,9 +18,16 @@ NS_ASSUME_NONNULL_BEGIN
 
 /** Represents an encoded frame's type. */
 typedef NS_ENUM(NSUInteger, RTCFrameType) {
-  EmptyFrame,
-  VideoFrameKey,
-  VideoFrameDelta,
+  EmptyFrame = 0,
+  AudioFrameSpeech = 1,
+  AudioFrameCN = 2,
+  VideoFrameKey = 3,
+  VideoFrameDelta = 4,
+};
+
+typedef NS_ENUM(NSUInteger, RTCVideoContentType) {
+  Unspecified,
+  Screenshare,
 };
 
 /** Represents an encoded frame. Corresponds to webrtc::EncodedImage. */
@@ -40,6 +47,7 @@ RTC_EXPORT
 @property(nonatomic, assign) int rotation;
 @property(nonatomic, assign) BOOL completeFrame;
 @property(nonatomic, retain) NSNumber *qp;
+@property(nonatomic, assign) RTCVideoContentType contentType;
 
 @end
 
@@ -63,13 +71,18 @@ RTC_EXPORT
 @end
 
 /** Callback block for encoder. */
-typedef void (^RTCVideoEncoderCallback)(RTCEncodedImage *frame,
+typedef BOOL (^RTCVideoEncoderCallback)(RTCEncodedImage *frame,
                                         id<RTCCodecSpecificInfo> info,
                                         RTCRtpFragmentationHeader *header);
 
 /** Callback block for decoder. */
 typedef void (^RTCVideoDecoderCallback)(RTCVideoFrame *frame);
 
+typedef NS_ENUM(NSUInteger, RTCVideoCodecMode) {
+  RealtimeVideo,
+  Screensharing,
+};
+
 /** Settings for encoder. Corresponds to webrtc::VideoCodec. */
 RTC_EXPORT
 @interface RTCVideoEncoderSettings : NSObject
@@ -87,6 +100,7 @@ RTC_EXPORT
 @property(nonatomic, assign) uint32_t maxFramerate;
 
 @property(nonatomic, assign) unsigned int qpMax;
+@property(nonatomic, assign) RTCVideoCodecMode mode;
 
 @end
 
@@ -115,7 +129,7 @@ RTC_EXPORT
 - (int)encode:(RTCVideoFrame *)frame
     codecSpecificInfo:(id<RTCCodecSpecificInfo>)info
            frameTypes:(NSArray<NSNumber *> *)frameTypes;
-- (BOOL)setBitrate:(uint32_t)bitrateKbit framerate:(uint32_t)framerate;
+- (int)setBitrate:(uint32_t)bitrateKbit framerate:(uint32_t)framerate;
 
 @end