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_RECEIVER_VIDEO_DECODER_H_ 6 #define MEDIA_CAST_RECEIVER_VIDEO_DECODER_H_ 7 8 #include "base/callback.h" 9 #include "base/memory/ref_counted.h" 10 #include "base/memory/scoped_ptr.h" 11 #include "media/base/video_frame.h" 12 #include "media/cast/cast_config.h" 13 #include "media/cast/transport/cast_transport_config.h" 14 15 namespace media { 16 namespace cast { 17 18 class CastEnvironment; 19 20 class VideoDecoder { 21 public: 22 // Callback passed to DecodeFrame, to deliver a decoded video frame from the 23 // decoder. |frame| can be NULL when errors occur. |is_continuous| is 24 // normally true, but will be false if the decoder has detected a frame skip 25 // since the last decode operation; and the client might choose to take steps 26 // to smooth/interpolate video discontinuities in this case. 27 typedef base::Callback<void(const scoped_refptr<VideoFrame>& frame, 28 bool is_continuous)> DecodeFrameCallback; 29 30 VideoDecoder(const scoped_refptr<CastEnvironment>& cast_environment, 31 transport::VideoCodec codec); 32 virtual ~VideoDecoder(); 33 34 // Returns STATUS_VIDEO_INITIALIZED if the decoder was successfully 35 // constructed from the given FrameReceiverConfig. If this method returns any 36 // other value, calls to DecodeFrame() will not succeed. 37 CastInitializationStatus InitializationResult() const; 38 39 // Decode the payload in |encoded_frame| asynchronously. |callback| will be 40 // invoked on the CastEnvironment::MAIN thread with the result. 41 // 42 // In the normal case, |encoded_frame->frame_id| will be 43 // monotonically-increasing by 1 for each successive call to this method. 44 // When it is not, the decoder will assume one or more frames have been 45 // dropped (e.g., due to packet loss), and will perform recovery actions. 46 void DecodeFrame(scoped_ptr<transport::EncodedFrame> encoded_frame, 47 const DecodeFrameCallback& callback); 48 49 private: 50 class FakeImpl; 51 class ImplBase; 52 class Vp8Impl; 53 54 const scoped_refptr<CastEnvironment> cast_environment_; 55 scoped_refptr<ImplBase> impl_; 56 57 DISALLOW_COPY_AND_ASSIGN(VideoDecoder); 58 }; 59 60 } // namespace cast 61 } // namespace media 62 63 #endif // MEDIA_CAST_RECEIVER_VIDEO_DECODER_H_ 64