sdk/android/api/org/webrtc/HardwareVideoEncoderFactory.java - src - Git at Google

 /*
  *  Copyright 2017 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.
  */

 package org.webrtc;

 import static org.webrtc.MediaCodecUtils.EXYNOS_PREFIX;
 import static org.webrtc.MediaCodecUtils.INTEL_PREFIX;
 import static org.webrtc.MediaCodecUtils.QCOM_PREFIX;

 import android.media.MediaCodecInfo;
 import android.media.MediaCodecList;
 import android.os.Build;
 import android.support.annotation.Nullable;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;

 /** Factory for android hardware video encoders. */
 @SuppressWarnings("deprecation") // API 16 requires the use of deprecated methods.
 public class HardwareVideoEncoderFactory implements VideoEncoderFactory {
   private static final String TAG = "HardwareVideoEncoderFactory";

   // Forced key frame interval - used to reduce color distortions on Qualcomm platforms.
   private static final int QCOM_VP8_KEY_FRAME_INTERVAL_ANDROID_L_MS = 15000;
   private static final int QCOM_VP8_KEY_FRAME_INTERVAL_ANDROID_M_MS = 20000;
   private static final int QCOM_VP8_KEY_FRAME_INTERVAL_ANDROID_N_MS = 15000;

   // List of devices with poor H.264 encoder quality.
   // HW H.264 encoder on below devices has poor bitrate control - actual
   // bitrates deviates a lot from the target value.
   private static final List<String> H264_HW_EXCEPTION_MODELS =
       Arrays.asList("SAMSUNG-SGH-I337", "Nexus 7", "Nexus 4");

   @Nullable private final EglBase14.Context sharedContext;
   private final boolean enableIntelVp8Encoder;
   private final boolean enableH264HighProfile;
   @Nullable private final Predicate<MediaCodecInfo> codecAllowedPredicate;

   /**
    * Creates a HardwareVideoEncoderFactory that supports surface texture encoding.
    *
    * @param sharedContext The textures generated will be accessible from this context. May be null,
    *                      this disables texture support.
    * @param enableIntelVp8Encoder true if Intel's VP8 encoder enabled.
    * @param enableH264HighProfile true if H264 High Profile enabled.
    */
   public HardwareVideoEncoderFactory(
       EglBase.Context sharedContext, boolean enableIntelVp8Encoder, boolean enableH264HighProfile) {
     this(sharedContext, enableIntelVp8Encoder, enableH264HighProfile,
         /* codecAllowedPredicate= */ null);
   }

   /**
    * Creates a HardwareVideoEncoderFactory that supports surface texture encoding.
    *
    * @param sharedContext The textures generated will be accessible from this context. May be null,
    *                      this disables texture support.
    * @param enableIntelVp8Encoder true if Intel's VP8 encoder enabled.
    * @param enableH264HighProfile true if H264 High Profile enabled.
    * @param codecAllowedPredicate optional predicate to filter codecs. All codecs are allowed
    *                              when predicate is not provided.
    */
   public HardwareVideoEncoderFactory(EglBase.Context sharedContext, boolean enableIntelVp8Encoder,
       boolean enableH264HighProfile, @Nullable Predicate<MediaCodecInfo> codecAllowedPredicate) {
     // Texture mode requires EglBase14.
     if (sharedContext instanceof EglBase14.Context) {
       this.sharedContext = (EglBase14.Context) sharedContext;
     } else {
       Logging.w(TAG, "No shared EglBase.Context.  Encoders will not use texture mode.");
       this.sharedContext = null;
     }
     this.enableIntelVp8Encoder = enableIntelVp8Encoder;
     this.enableH264HighProfile = enableH264HighProfile;
     this.codecAllowedPredicate = codecAllowedPredicate;
   }

   @Deprecated
   public HardwareVideoEncoderFactory(boolean enableIntelVp8Encoder, boolean enableH264HighProfile) {
     this(null, enableIntelVp8Encoder, enableH264HighProfile);
   }

   @Nullable
   @Override
   public VideoEncoder createEncoder(VideoCodecInfo input) {
     // HW encoding is not supported below Android Kitkat.
     if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
       return null;
     }

     VideoCodecMimeType type = VideoCodecMimeType.valueOf(input.name);
     MediaCodecInfo info = findCodecForType(type);

     if (info == null) {
       return null;
     }

     String codecName = info.getName();
     String mime = type.mimeType();
     Integer surfaceColorFormat = MediaCodecUtils.selectColorFormat(
         MediaCodecUtils.TEXTURE_COLOR_FORMATS, info.getCapabilitiesForType(mime));
     Integer yuvColorFormat = MediaCodecUtils.selectColorFormat(
         MediaCodecUtils.ENCODER_COLOR_FORMATS, info.getCapabilitiesForType(mime));

     if (type == VideoCodecMimeType.H264) {
       boolean isHighProfile = H264Utils.isSameH264Profile(
           input.params, MediaCodecUtils.getCodecProperties(type, /* highProfile= */ true));
       boolean isBaselineProfile = H264Utils.isSameH264Profile(
           input.params, MediaCodecUtils.getCodecProperties(type, /* highProfile= */ false));

       if (!isHighProfile && !isBaselineProfile) {
         return null;
       }
       if (isHighProfile && !isH264HighProfileSupported(info)) {
         return null;
       }
     }

     return new HardwareVideoEncoder(new MediaCodecWrapperFactoryImpl(), codecName, type,
         surfaceColorFormat, yuvColorFormat, input.params, getKeyFrameIntervalSec(type),
         getForcedKeyFrameIntervalMs(type, codecName), createBitrateAdjuster(type, codecName),
         sharedContext);
   }

   @Override
   public VideoCodecInfo[] getSupportedCodecs() {
     // HW encoding is not supported below Android Kitkat.
     if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
       return new VideoCodecInfo[0];
     }

     List<VideoCodecInfo> supportedCodecInfos = new ArrayList<VideoCodecInfo>();
     // Generate a list of supported codecs in order of preference:
     // VP8, VP9, H264 (high profile), and H264 (baseline profile).
     for (VideoCodecMimeType type : new VideoCodecMimeType[] {
              VideoCodecMimeType.VP8, VideoCodecMimeType.VP9, VideoCodecMimeType.H264}) {
       MediaCodecInfo codec = findCodecForType(type);
       if (codec != null) {
         String name = type.name();
         // TODO(sakal): Always add H264 HP once WebRTC correctly removes codecs that are not
         // supported by the decoder.
         if (type == VideoCodecMimeType.H264 && isH264HighProfileSupported(codec)) {
           supportedCodecInfos.add(new VideoCodecInfo(
               name, MediaCodecUtils.getCodecProperties(type, /* highProfile= */ true)));
         }

         supportedCodecInfos.add(new VideoCodecInfo(
             name, MediaCodecUtils.getCodecProperties(type, /* highProfile= */ false)));
       }
     }

     return supportedCodecInfos.toArray(new VideoCodecInfo[supportedCodecInfos.size()]);
   }

   private @Nullable MediaCodecInfo findCodecForType(VideoCodecMimeType type) {
     for (int i = 0; i < MediaCodecList.getCodecCount(); ++i) {
       MediaCodecInfo info = null;
       try {
         info = MediaCodecList.getCodecInfoAt(i);
       } catch (IllegalArgumentException e) {
         Logging.e(TAG, "Cannot retrieve encoder codec info", e);
       }

       if (info == null || !info.isEncoder()) {
         continue;
       }

       if (isSupportedCodec(info, type)) {
         return info;
       }
     }
     return null; // No support for this type.
   }

   // Returns true if the given MediaCodecInfo indicates a supported encoder for the given type.
   private boolean isSupportedCodec(MediaCodecInfo info, VideoCodecMimeType type) {
     if (!MediaCodecUtils.codecSupportsType(info, type)) {
       return false;
     }
     // Check for a supported color format.
     if (MediaCodecUtils.selectColorFormat(
             MediaCodecUtils.ENCODER_COLOR_FORMATS, info.getCapabilitiesForType(type.mimeType()))
         == null) {
       return false;
     }
     return isHardwareSupportedInCurrentSdk(info, type) && isMediaCodecAllowed(info);
   }

   // Returns true if the given MediaCodecInfo indicates a hardware module that is supported on the
   // current SDK.
   private boolean isHardwareSupportedInCurrentSdk(MediaCodecInfo info, VideoCodecMimeType type) {
     switch (type) {
       case VP8:
         return isHardwareSupportedInCurrentSdkVp8(info);
       case VP9:
         return isHardwareSupportedInCurrentSdkVp9(info);
       case H264:
         return isHardwareSupportedInCurrentSdkH264(info);
     }
     return false;
   }

   private boolean isHardwareSupportedInCurrentSdkVp8(MediaCodecInfo info) {
     String name = info.getName();
     // QCOM Vp8 encoder is supported in KITKAT or later.
     return (name.startsWith(QCOM_PREFIX) && Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT)
         // Exynos VP8 encoder is supported in M or later.
         || (name.startsWith(EXYNOS_PREFIX) && Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
         // Intel Vp8 encoder is supported in LOLLIPOP or later, with the intel encoder enabled.
         || (name.startsWith(INTEL_PREFIX) && Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP
                && enableIntelVp8Encoder);
   }

   private boolean isHardwareSupportedInCurrentSdkVp9(MediaCodecInfo info) {
     String name = info.getName();
     return (name.startsWith(QCOM_PREFIX) || name.startsWith(EXYNOS_PREFIX))
         // Both QCOM and Exynos VP9 encoders are supported in N or later.
         && Build.VERSION.SDK_INT >= Build.VERSION_CODES.N;
   }

   private boolean isHardwareSupportedInCurrentSdkH264(MediaCodecInfo info) {
     // First, H264 hardware might perform poorly on this model.
     if (H264_HW_EXCEPTION_MODELS.contains(Build.MODEL)) {
       return false;
     }
     String name = info.getName();
     // QCOM H264 encoder is supported in KITKAT or later.
     return (name.startsWith(QCOM_PREFIX) && Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT)
         // Exynos H264 encoder is supported in LOLLIPOP or later.
         || (name.startsWith(EXYNOS_PREFIX)
                && Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP);
   }

   private boolean isMediaCodecAllowed(MediaCodecInfo info) {
     if (codecAllowedPredicate == null) {
       return true;
     }
     return codecAllowedPredicate.test(info);
   }

   private int getKeyFrameIntervalSec(VideoCodecMimeType type) {
     switch (type) {
       case VP8: // Fallthrough intended.
       case VP9:
         return 100;
       case H264:
         return 20;
     }
     throw new IllegalArgumentException("Unsupported VideoCodecMimeType " + type);
   }

   private int getForcedKeyFrameIntervalMs(VideoCodecMimeType type, String codecName) {
     if (type == VideoCodecMimeType.VP8 && codecName.startsWith(QCOM_PREFIX)) {
       if (Build.VERSION.SDK_INT == Build.VERSION_CODES.LOLLIPOP
           || Build.VERSION.SDK_INT == Build.VERSION_CODES.LOLLIPOP_MR1) {
         return QCOM_VP8_KEY_FRAME_INTERVAL_ANDROID_L_MS;
       } else if (Build.VERSION.SDK_INT == Build.VERSION_CODES.M) {
         return QCOM_VP8_KEY_FRAME_INTERVAL_ANDROID_M_MS;
       } else if (Build.VERSION.SDK_INT > Build.VERSION_CODES.M) {
         return QCOM_VP8_KEY_FRAME_INTERVAL_ANDROID_N_MS;
       }
     }
     // Other codecs don't need key frame forcing.
     return 0;
   }

   private BitrateAdjuster createBitrateAdjuster(VideoCodecMimeType type, String codecName) {
     if (codecName.startsWith(EXYNOS_PREFIX)) {
       if (type == VideoCodecMimeType.VP8) {
         // Exynos VP8 encoders need dynamic bitrate adjustment.
         return new DynamicBitrateAdjuster();
       } else {
         // Exynos VP9 and H264 encoders need framerate-based bitrate adjustment.
         return new FramerateBitrateAdjuster();
       }
     }
     // Other codecs don't need bitrate adjustment.
     return new BaseBitrateAdjuster();
   }

   private boolean isH264HighProfileSupported(MediaCodecInfo info) {
     return enableH264HighProfile && Build.VERSION.SDK_INT > Build.VERSION_CODES.M
         && info.getName().startsWith(EXYNOS_PREFIX);
   }
 }
	/*
	* Copyright 2017 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.
	*/

	package org.webrtc;

	import static org.webrtc.MediaCodecUtils.EXYNOS_PREFIX;
	import static org.webrtc.MediaCodecUtils.INTEL_PREFIX;
	import static org.webrtc.MediaCodecUtils.QCOM_PREFIX;

	import android.media.MediaCodecInfo;
	import android.media.MediaCodecList;
	import android.os.Build;
	import android.support.annotation.Nullable;
	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.List;

	/** Factory for android hardware video encoders. */
	@SuppressWarnings("deprecation") // API 16 requires the use of deprecated methods.
	public class HardwareVideoEncoderFactory implements VideoEncoderFactory {
	private static final String TAG = "HardwareVideoEncoderFactory";

	// Forced key frame interval - used to reduce color distortions on Qualcomm platforms.
	private static final int QCOM_VP8_KEY_FRAME_INTERVAL_ANDROID_L_MS = 15000;
	private static final int QCOM_VP8_KEY_FRAME_INTERVAL_ANDROID_M_MS = 20000;
	private static final int QCOM_VP8_KEY_FRAME_INTERVAL_ANDROID_N_MS = 15000;

	// List of devices with poor H.264 encoder quality.
	// HW H.264 encoder on below devices has poor bitrate control - actual
	// bitrates deviates a lot from the target value.
	private static final List<String> H264_HW_EXCEPTION_MODELS =
	Arrays.asList("SAMSUNG-SGH-I337", "Nexus 7", "Nexus 4");

	@Nullable private final EglBase14.Context sharedContext;
	private final boolean enableIntelVp8Encoder;
	private final boolean enableH264HighProfile;
	@Nullable private final Predicate<MediaCodecInfo> codecAllowedPredicate;

	/**
	* Creates a HardwareVideoEncoderFactory that supports surface texture encoding.
	*
	* @param sharedContext The textures generated will be accessible from this context. May be null,
	* this disables texture support.
	* @param enableIntelVp8Encoder true if Intel's VP8 encoder enabled.
	* @param enableH264HighProfile true if H264 High Profile enabled.
	*/
	public HardwareVideoEncoderFactory(
	EglBase.Context sharedContext, boolean enableIntelVp8Encoder, boolean enableH264HighProfile) {
	this(sharedContext, enableIntelVp8Encoder, enableH264HighProfile,
	/* codecAllowedPredicate= */ null);
	}

	/**
	* Creates a HardwareVideoEncoderFactory that supports surface texture encoding.
	*
	* @param sharedContext The textures generated will be accessible from this context. May be null,
	* this disables texture support.
	* @param enableIntelVp8Encoder true if Intel's VP8 encoder enabled.
	* @param enableH264HighProfile true if H264 High Profile enabled.
	* @param codecAllowedPredicate optional predicate to filter codecs. All codecs are allowed
	* when predicate is not provided.
	*/
	public HardwareVideoEncoderFactory(EglBase.Context sharedContext, boolean enableIntelVp8Encoder,
	boolean enableH264HighProfile, @Nullable Predicate<MediaCodecInfo> codecAllowedPredicate) {
	// Texture mode requires EglBase14.
	if (sharedContext instanceof EglBase14.Context) {
	this.sharedContext = (EglBase14.Context) sharedContext;
	} else {
	Logging.w(TAG, "No shared EglBase.Context. Encoders will not use texture mode.");
	this.sharedContext = null;
	}
	this.enableIntelVp8Encoder = enableIntelVp8Encoder;
	this.enableH264HighProfile = enableH264HighProfile;
	this.codecAllowedPredicate = codecAllowedPredicate;
	}

	@Deprecated
	public HardwareVideoEncoderFactory(boolean enableIntelVp8Encoder, boolean enableH264HighProfile) {
	this(null, enableIntelVp8Encoder, enableH264HighProfile);
	}

	@Nullable
	@Override
	public VideoEncoder createEncoder(VideoCodecInfo input) {
	// HW encoding is not supported below Android Kitkat.
	if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
	return null;
	}

	VideoCodecMimeType type = VideoCodecMimeType.valueOf(input.name);
	MediaCodecInfo info = findCodecForType(type);

	if (info == null) {
	return null;
	}

	String codecName = info.getName();
	String mime = type.mimeType();
	Integer surfaceColorFormat = MediaCodecUtils.selectColorFormat(
	MediaCodecUtils.TEXTURE_COLOR_FORMATS, info.getCapabilitiesForType(mime));
	Integer yuvColorFormat = MediaCodecUtils.selectColorFormat(
	MediaCodecUtils.ENCODER_COLOR_FORMATS, info.getCapabilitiesForType(mime));

	if (type == VideoCodecMimeType.H264) {
	boolean isHighProfile = H264Utils.isSameH264Profile(
	input.params, MediaCodecUtils.getCodecProperties(type, /* highProfile= */ true));
	boolean isBaselineProfile = H264Utils.isSameH264Profile(
	input.params, MediaCodecUtils.getCodecProperties(type, /* highProfile= */ false));

	if (!isHighProfile && !isBaselineProfile) {
	return null;
	}
	if (isHighProfile && !isH264HighProfileSupported(info)) {
	return null;
	}
	}

	return new HardwareVideoEncoder(new MediaCodecWrapperFactoryImpl(), codecName, type,
	surfaceColorFormat, yuvColorFormat, input.params, getKeyFrameIntervalSec(type),
	getForcedKeyFrameIntervalMs(type, codecName), createBitrateAdjuster(type, codecName),
	sharedContext);
	}

	@Override
	public VideoCodecInfo[] getSupportedCodecs() {
	// HW encoding is not supported below Android Kitkat.
	if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
	return new VideoCodecInfo[0];
	}

	List<VideoCodecInfo> supportedCodecInfos = new ArrayList<VideoCodecInfo>();
	// Generate a list of supported codecs in order of preference:
	// VP8, VP9, H264 (high profile), and H264 (baseline profile).
	for (VideoCodecMimeType type : new VideoCodecMimeType[] {
	VideoCodecMimeType.VP8, VideoCodecMimeType.VP9, VideoCodecMimeType.H264}) {
	MediaCodecInfo codec = findCodecForType(type);
	if (codec != null) {
	String name = type.name();
	// TODO(sakal): Always add H264 HP once WebRTC correctly removes codecs that are not
	// supported by the decoder.
	if (type == VideoCodecMimeType.H264 && isH264HighProfileSupported(codec)) {
	supportedCodecInfos.add(new VideoCodecInfo(
	name, MediaCodecUtils.getCodecProperties(type, /* highProfile= */ true)));
	}

	supportedCodecInfos.add(new VideoCodecInfo(
	name, MediaCodecUtils.getCodecProperties(type, /* highProfile= */ false)));
	}
	}

	return supportedCodecInfos.toArray(new VideoCodecInfo[supportedCodecInfos.size()]);
	}

	private @Nullable MediaCodecInfo findCodecForType(VideoCodecMimeType type) {
	for (int i = 0; i < MediaCodecList.getCodecCount(); ++i) {
	MediaCodecInfo info = null;
	try {
	info = MediaCodecList.getCodecInfoAt(i);
	} catch (IllegalArgumentException e) {
	Logging.e(TAG, "Cannot retrieve encoder codec info", e);
	}

	if (info == null \|\| !info.isEncoder()) {
	continue;
	}

	if (isSupportedCodec(info, type)) {
	return info;
	}
	}
	return null; // No support for this type.
	}

	// Returns true if the given MediaCodecInfo indicates a supported encoder for the given type.
	private boolean isSupportedCodec(MediaCodecInfo info, VideoCodecMimeType type) {
	if (!MediaCodecUtils.codecSupportsType(info, type)) {
	return false;
	}
	// Check for a supported color format.
	if (MediaCodecUtils.selectColorFormat(
	MediaCodecUtils.ENCODER_COLOR_FORMATS, info.getCapabilitiesForType(type.mimeType()))
	== null) {
	return false;
	}
	return isHardwareSupportedInCurrentSdk(info, type) && isMediaCodecAllowed(info);
	}

	// Returns true if the given MediaCodecInfo indicates a hardware module that is supported on the
	// current SDK.
	private boolean isHardwareSupportedInCurrentSdk(MediaCodecInfo info, VideoCodecMimeType type) {
	switch (type) {
	case VP8:
	return isHardwareSupportedInCurrentSdkVp8(info);
	case VP9:
	return isHardwareSupportedInCurrentSdkVp9(info);
	case H264:
	return isHardwareSupportedInCurrentSdkH264(info);
	}
	return false;
	}

	private boolean isHardwareSupportedInCurrentSdkVp8(MediaCodecInfo info) {
	String name = info.getName();
	// QCOM Vp8 encoder is supported in KITKAT or later.
	return (name.startsWith(QCOM_PREFIX) && Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT)
	// Exynos VP8 encoder is supported in M or later.
	\|\| (name.startsWith(EXYNOS_PREFIX) && Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
	// Intel Vp8 encoder is supported in LOLLIPOP or later, with the intel encoder enabled.
	\|\| (name.startsWith(INTEL_PREFIX) && Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP
	&& enableIntelVp8Encoder);
	}

	private boolean isHardwareSupportedInCurrentSdkVp9(MediaCodecInfo info) {
	String name = info.getName();
	return (name.startsWith(QCOM_PREFIX) \|\| name.startsWith(EXYNOS_PREFIX))
	// Both QCOM and Exynos VP9 encoders are supported in N or later.
	&& Build.VERSION.SDK_INT >= Build.VERSION_CODES.N;
	}

	private boolean isHardwareSupportedInCurrentSdkH264(MediaCodecInfo info) {
	// First, H264 hardware might perform poorly on this model.
	if (H264_HW_EXCEPTION_MODELS.contains(Build.MODEL)) {
	return false;
	}
	String name = info.getName();
	// QCOM H264 encoder is supported in KITKAT or later.
	return (name.startsWith(QCOM_PREFIX) && Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT)
	// Exynos H264 encoder is supported in LOLLIPOP or later.
	\|\| (name.startsWith(EXYNOS_PREFIX)
	&& Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP);
	}

	private boolean isMediaCodecAllowed(MediaCodecInfo info) {
	if (codecAllowedPredicate == null) {
	return true;
	}
	return codecAllowedPredicate.test(info);
	}

	private int getKeyFrameIntervalSec(VideoCodecMimeType type) {
	switch (type) {
	case VP8: // Fallthrough intended.
	case VP9:
	return 100;
	case H264:
	return 20;
	}
	throw new IllegalArgumentException("Unsupported VideoCodecMimeType " + type);
	}

	private int getForcedKeyFrameIntervalMs(VideoCodecMimeType type, String codecName) {
	if (type == VideoCodecMimeType.VP8 && codecName.startsWith(QCOM_PREFIX)) {
	if (Build.VERSION.SDK_INT == Build.VERSION_CODES.LOLLIPOP
	\|\| Build.VERSION.SDK_INT == Build.VERSION_CODES.LOLLIPOP_MR1) {
	return QCOM_VP8_KEY_FRAME_INTERVAL_ANDROID_L_MS;
	} else if (Build.VERSION.SDK_INT == Build.VERSION_CODES.M) {
	return QCOM_VP8_KEY_FRAME_INTERVAL_ANDROID_M_MS;
	} else if (Build.VERSION.SDK_INT > Build.VERSION_CODES.M) {
	return QCOM_VP8_KEY_FRAME_INTERVAL_ANDROID_N_MS;
	}
	}
	// Other codecs don't need key frame forcing.
	return 0;
	}

	private BitrateAdjuster createBitrateAdjuster(VideoCodecMimeType type, String codecName) {
	if (codecName.startsWith(EXYNOS_PREFIX)) {
	if (type == VideoCodecMimeType.VP8) {
	// Exynos VP8 encoders need dynamic bitrate adjustment.
	return new DynamicBitrateAdjuster();
	} else {
	// Exynos VP9 and H264 encoders need framerate-based bitrate adjustment.
	return new FramerateBitrateAdjuster();
	}
	}
	// Other codecs don't need bitrate adjustment.
	return new BaseBitrateAdjuster();
	}

	private boolean isH264HighProfileSupported(MediaCodecInfo info) {
	return enableH264HighProfile && Build.VERSION.SDK_INT > Build.VERSION_CODES.M
	&& info.getName().startsWith(EXYNOS_PREFIX);
	}
	}