media/cast/sender/video_encoder_impl.h

   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   // Returns true if VideoEncoderImpl can be used with the given |video_config|.
  33   static bool IsSupported(const VideoSenderConfig& video_config);
  34
  35   VideoEncoderImpl(scoped_refptr<CastEnvironment> cast_environment,
  36                    const VideoSenderConfig& video_config,
  37                    const StatusChangeCallback& status_change_cb);
  38
  39   ~VideoEncoderImpl() override;
  40
  41   // VideoEncoder implementation.
  42   bool EncodeVideoFrame(
  43       const scoped_refptr<media::VideoFrame>& video_frame,
  44       const base::TimeTicks& reference_time,
  45       const FrameEncodedCallback& frame_encoded_callback) override;
  46   void SetBitRate(int new_bit_rate) override;
  47   void GenerateKeyFrame() override;
  48   void LatestFrameIdToReference(uint32 frame_id) override;
  49
  50  private:
  51   scoped_refptr<CastEnvironment> cast_environment_;
  52   CodecDynamicConfig dynamic_config_;
  53
  54   // This member belongs to the video encoder thread. It must not be
  55   // dereferenced on the main thread. We manage the lifetime of this member
  56   // manually because it needs to be initialize, used and destroyed on the
  57   // video encoder thread and video encoder thread can out-live the main thread.
  58   scoped_ptr<SoftwareVideoEncoder> encoder_;
  59
  60   DISALLOW_COPY_AND_ASSIGN(VideoEncoderImpl);
  61 };
  62
  63 }  // namespace cast
  64 }  // namespace media
  65
  66 #endif  // MEDIA_CAST_SENDER_VIDEO_ENCODER_IMPL_H_