Add a webrtc{en,de}coderfactory implementation for VideoToolbox

webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_encoder.h

-/*
- *  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.
- *
- */
-
-#ifndef WEBRTC_MODULES_VIDEO_CODING_CODECS_H264_H264_VIDEO_TOOLBOX_ENCODER_H_
-#define WEBRTC_MODULES_VIDEO_CODING_CODECS_H264_H264_VIDEO_TOOLBOX_ENCODER_H_
-
-#include "webrtc/base/criticalsection.h"
-#include "webrtc/common_video/h264/h264_bitstream_parser.h"
-#include "webrtc/common_video/include/bitrate_adjuster.h"
-#include "webrtc/common_video/rotation.h"
-#include "webrtc/modules/video_coding/codecs/h264/include/h264.h"
-#include "webrtc/modules/video_coding/utility/quality_scaler.h"
-
-#if defined(WEBRTC_VIDEO_TOOLBOX_SUPPORTED)
-
-#include <VideoToolbox/VideoToolbox.h>
-#include <vector>
-
-// This file provides a H264 encoder implementation using the VideoToolbox
-// APIs. Since documentation is almost non-existent, this is largely based on
-// the information in the VideoToolbox header files, a talk from WWDC 2014 and
-// experimentation.
-
-namespace webrtc {
-
-class H264VideoToolboxEncoder : public H264Encoder {
- public:
-  H264VideoToolboxEncoder();
-
-  ~H264VideoToolboxEncoder() override;
-
-  int InitEncode(const VideoCodec* codec_settings,
-                 int number_of_cores,
-                 size_t max_payload_size) override;
-
-  int Encode(const VideoFrame& input_image,
-             const CodecSpecificInfo* codec_specific_info,
-             const std::vector<FrameType>* frame_types) override;
-
-  int RegisterEncodeCompleteCallback(EncodedImageCallback* callback) override;
-
-  void OnDroppedFrame() override;
-  int SetChannelParameters(uint32_t packet_loss, int64_t rtt) override;
-
-  int SetRates(uint32_t new_bitrate_kbit, uint32_t frame_rate) override;
-
-  int Release() override;
-
-  const char* ImplementationName() const override;
-
-  bool SupportsNativeHandle() const override;
-
-  void OnEncodedFrame(OSStatus status,
-                      VTEncodeInfoFlags info_flags,
-                      CMSampleBufferRef sample_buffer,
-                      CodecSpecificInfo codec_specific_info,
-                      int32_t width,
-                      int32_t height,
-                      int64_t render_time_ms,
-                      uint32_t timestamp,
-                      VideoRotation rotation);
-
- private:
-  int ResetCompressionSession();
-  void ConfigureCompressionSession();
-  void DestroyCompressionSession();
-  rtc::scoped_refptr<VideoFrameBuffer> GetScaledBufferOnEncode(
-      const rtc::scoped_refptr<VideoFrameBuffer>& frame);
-  void SetBitrateBps(uint32_t bitrate_bps);
-  void SetEncoderBitrateBps(uint32_t bitrate_bps);
-
-  EncodedImageCallback* callback_;
-  VTCompressionSessionRef compression_session_;
-  BitrateAdjuster bitrate_adjuster_;
-  uint32_t target_bitrate_bps_;
-  uint32_t encoder_bitrate_bps_;
-  int32_t width_;
-  int32_t height_;
-
-  rtc::CriticalSection quality_scaler_crit_;
-  QualityScaler quality_scaler_ GUARDED_BY(quality_scaler_crit_);
-  H264BitstreamParser h264_bitstream_parser_;
-  bool enable_scaling_;
-  std::vector<uint8_t> nv12_scale_buffer_;
-};  // H264VideoToolboxEncoder
-
-}  // namespace webrtc
-
-#endif  // defined(WEBRTC_VIDEO_TOOLBOX_SUPPORTED)
-#endif  // WEBRTC_MODULES_VIDEO_CODING_CODECS_H264_H264_VIDEO_TOOLBOX_ENCODER_H_