1 // Copyright 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef MEDIA_CAST_VIDEO_SENDER_VIDEO_ENCODER_H_ 6 #define MEDIA_CAST_VIDEO_SENDER_VIDEO_ENCODER_H_ 7 8 #include "base/memory/scoped_ptr.h" 9 #include "base/memory/weak_ptr.h" 10 #include "base/message_loop/message_loop.h" 11 #include "media/cast/cast_config.h" 12 #include "media/cast/cast_environment.h" 13 #include "media/cast/video_sender/codecs/vp8/vp8_encoder.h" 14 15 namespace media { 16 class VideoFrame; 17 } 18 19 namespace media { 20 namespace cast { 21 22 // This object is called external from the main cast thread and internally from 23 // the video encoder thread. 24 class VideoEncoder : public VideoEncoderController { 25 public: 26 typedef base::Callback<void(scoped_ptr<EncodedVideoFrame>, 27 const base::TimeTicks&)> FrameEncodedCallback; 28 29 VideoEncoder(scoped_refptr<CastEnvironment> cast_environment, 30 const VideoSenderConfig& video_config, 31 uint8 max_unacked_frames); 32 33 virtual ~VideoEncoder(); 34 35 // Called from the main cast thread. This function post the encode task to the 36 // video encoder thread; 37 // The video_frame must be valid until the closure callback is called. 38 // The closure callback is called from the video encoder thread as soon as 39 // the encoder is done with the frame; it does not mean that the encoded frame 40 // has been sent out. 41 // Once the encoded frame is ready the frame_encoded_callback is called. 42 bool EncodeVideoFrame(const scoped_refptr<media::VideoFrame>& video_frame, 43 const base::TimeTicks& capture_time, 44 const FrameEncodedCallback& frame_encoded_callback); 45 46 protected: 47 struct CodecDynamicConfig { 48 bool key_frame_requested; 49 uint32 latest_frame_id_to_reference; 50 int bit_rate; 51 }; 52 53 // The actual encode, called from the video encoder thread. 54 void EncodeVideoFrameEncoderThread( 55 const scoped_refptr<media::VideoFrame>& video_frame, 56 const base::TimeTicks& capture_time, 57 const CodecDynamicConfig& dynamic_config, 58 const FrameEncodedCallback& frame_encoded_callback); 59 60 // The following functions are called from the main cast thread. 61 virtual void SetBitRate(int new_bit_rate) OVERRIDE; 62 virtual void SkipNextFrame(bool skip_next_frame) OVERRIDE; 63 virtual void GenerateKeyFrame() OVERRIDE; 64 virtual void LatestFrameIdToReference(uint32 frame_id) OVERRIDE; 65 virtual int NumberOfSkippedFrames() const OVERRIDE; 66 67 private: 68 friend class base::RefCountedThreadSafe<VideoEncoder>; 69 70 const VideoSenderConfig video_config_; 71 scoped_refptr<CastEnvironment> cast_environment_; 72 scoped_ptr<Vp8Encoder> vp8_encoder_; 73 CodecDynamicConfig dynamic_config_; 74 bool skip_next_frame_; 75 int skip_count_; 76 77 DISALLOW_COPY_AND_ASSIGN(VideoEncoder); 78 }; 79 80 } // namespace cast 81 } // namespace media 82 83 #endif // MEDIA_CAST_VIDEO_SENDER_VIDEO_ENCODER_H_ 84