Split avfoundationcapturer classes in separate files.

webrtc/sdk/objc/Framework/Classes/RTCAVFoundationFormatMapper.h

+/*
+ *  Copyright 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.
+ */
+
+#import <AVFoundation/AVFoundation.h>
+#import <Foundation/Foundation.h>
+
+#include "webrtc/media/base/videocapturer.h"
+
+/**
+ * Helper class that encapsulates the mapping between cricket::VideoFormat and
+ * AVCaptureDeviceFormat.
+ */
+@interface RTCAVFoundationFormatMapper : NSObject
+
+/**
+ * Return the list of eligible cricket::VideoFormat instances for the given device.
+ *
+ * The list of eligible formats for the provided device is filtered list based on
+ * submedia type (pixel color format) and framerate. This filetring is for performance reasons.
+ * @param device the capture device to be used
+ * @return set of cricket::VideoFormat instances that map to the eligible formats for the device
+ */
++ (std::set<cricket::VideoFormat>)supportedVideoFormatsForDevice:(AVCaptureDevice *)device;
+
+/**
+ * Sets new capture format for the provided device and session.
+ *
+ * The new device format must be one of the formats returned from
+ * supportedVideoFormatsForDevice:.

[magjed_webrtc, 2016/11/21 13:57:52]

nit: remove colon.

[daniela-webrtc, 2016/11/21 16:29:50]

Done.

+ * The configuration of the session might not be successful if
+ * the device fails to lock for configuration or
+ * the new device format cannot be set as active format for the device.
+ * @param format The cricket::VideoFormat to be used for retrieving the new AVCaptureDeviceFormat
+ * @param device The device that will have new device format
+ * @param session The capture session to be configured
+ * @return YES if the session configuration was successful. No otherwise
+ */
++ (BOOL)setFormat:(const cricket::VideoFormat)format
+ forCaptureDevice:(AVCaptureDevice *)device
+   captureSession:(AVCaptureSession *)session;
+@end