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      1 // Copyright 2014 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_SENDER_VIDEO_ENCODER_IMPL_H_
      6 #define MEDIA_CAST_SENDER_VIDEO_ENCODER_IMPL_H_
      7 
      8 #include "base/memory/scoped_ptr.h"
      9 #include "media/cast/cast_config.h"
     10 #include "media/cast/cast_environment.h"
     11 #include "media/cast/sender/software_video_encoder.h"
     12 #include "media/cast/sender/video_encoder.h"
     13 
     14 namespace media {
     15 class VideoFrame;
     16 
     17 namespace cast {
     18 
     19 // This object is called external from the main cast thread and internally from
     20 // the video encoder thread.
     21 class VideoEncoderImpl : public VideoEncoder {
     22  public:
     23   struct CodecDynamicConfig {
     24     bool key_frame_requested;
     25     uint32 latest_frame_id_to_reference;
     26     int bit_rate;
     27   };
     28 
     29   typedef base::Callback<void(scoped_ptr<EncodedFrame>)>
     30       FrameEncodedCallback;
     31 
     32   VideoEncoderImpl(scoped_refptr<CastEnvironment> cast_environment,
     33                    const VideoSenderConfig& video_config,
     34                    int max_unacked_frames);
     35 
     36   virtual ~VideoEncoderImpl();
     37 
     38   // Called from the main cast thread. This function post the encode task to the
     39   // video encoder thread;
     40   // The video_frame must be valid until the closure callback is called.
     41   // The closure callback is called from the video encoder thread as soon as
     42   // the encoder is done with the frame; it does not mean that the encoded frame
     43   // has been sent out.
     44   // Once the encoded frame is ready the frame_encoded_callback is called.
     45   virtual bool EncodeVideoFrame(
     46       const scoped_refptr<media::VideoFrame>& video_frame,
     47       const base::TimeTicks& capture_time,
     48       const FrameEncodedCallback& frame_encoded_callback) OVERRIDE;
     49 
     50   // The following functions are called from the main cast thread.
     51   virtual void SetBitRate(int new_bit_rate) OVERRIDE;
     52   virtual void GenerateKeyFrame() OVERRIDE;
     53   virtual void LatestFrameIdToReference(uint32 frame_id) OVERRIDE;
     54 
     55  private:
     56   scoped_refptr<CastEnvironment> cast_environment_;
     57   CodecDynamicConfig dynamic_config_;
     58 
     59   // This member belongs to the video encoder thread. It must not be
     60   // dereferenced on the main thread. We manage the lifetime of this member
     61   // manually because it needs to be initialize, used and destroyed on the
     62   // video encoder thread and video encoder thread can out-live the main thread.
     63   scoped_ptr<SoftwareVideoEncoder> encoder_;
     64 
     65   DISALLOW_COPY_AND_ASSIGN(VideoEncoderImpl);
     66 };
     67 
     68 }  // namespace cast
     69 }  // namespace media
     70 
     71 #endif  // MEDIA_CAST_SENDER_VIDEO_ENCODER_IMPL_H_
     72