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 // This is the main interface for the cast receiver. All configuration are done 6 // at creation. 7 8 #ifndef MEDIA_CAST_CAST_RECEIVER_H_ 9 #define MEDIA_CAST_CAST_RECEIVER_H_ 10 11 #include "base/basictypes.h" 12 #include "base/callback.h" 13 #include "base/memory/ref_counted.h" 14 #include "base/memory/scoped_ptr.h" 15 #include "base/time/time.h" 16 #include "media/base/audio_bus.h" 17 #include "media/cast/cast_config.h" 18 #include "media/cast/cast_environment.h" 19 20 namespace media { 21 class VideoFrame; 22 23 namespace cast { 24 25 class PacketSender; 26 27 // The following callbacks are used to deliver decoded audio/video frame data, 28 // the frame's corresponding play-out time, and a continuity flag. 29 // |is_continuous| will be false to indicate the loss of data due to a loss of 30 // frames (or decoding errors). This allows the client to take steps to smooth 31 // discontinuities for playback. Note: A NULL pointer can be returned when data 32 // is not available (e.g., bad/missing packet). 33 typedef base::Callback<void(scoped_ptr<AudioBus> audio_bus, 34 const base::TimeTicks& playout_time, 35 bool is_continuous)> AudioFrameDecodedCallback; 36 // TODO(miu): |video_frame| includes a timestamp, so use that instead. 37 typedef base::Callback<void(const scoped_refptr<media::VideoFrame>& video_frame, 38 const base::TimeTicks& playout_time, 39 bool is_continuous)> VideoFrameDecodedCallback; 40 41 // The following callback delivers encoded frame data and metadata. The client 42 // should examine the |frame_id| field to determine whether any frames have been 43 // dropped (i.e., frame_id should be incrementing by one each time). Note: A 44 // NULL pointer can be returned on error. 45 typedef base::Callback<void(scoped_ptr<EncodedFrame>)> 46 ReceiveEncodedFrameCallback; 47 48 class CastReceiver { 49 public: 50 static scoped_ptr<CastReceiver> Create( 51 scoped_refptr<CastEnvironment> cast_environment, 52 const FrameReceiverConfig& audio_config, 53 const FrameReceiverConfig& video_config, 54 PacketSender* const packet_sender); 55 56 // All received RTP and RTCP packets for the call should be sent to this 57 // PacketReceiver. Can be called from any thread. 58 // TODO(hubbe): Replace with: 59 // virtual void ReceivePacket(scoped_ptr<Packet> packet) = 0; 60 virtual PacketReceiverCallback packet_receiver() = 0; 61 62 // Polling interface to get audio and video frames from the CastReceiver. The 63 // the RequestDecodedXXXXXFrame() methods utilize internal software-based 64 // decoding, while the RequestEncodedXXXXXFrame() methods provides 65 // still-encoded frames for use with external/hardware decoders. 66 // 67 // In all cases, the given |callback| is guaranteed to be run at some point in 68 // the future, except for those requests still enqueued at destruction time. 69 // 70 // These methods should all be called on the CastEnvironment's MAIN thread. 71 virtual void RequestDecodedAudioFrame( 72 const AudioFrameDecodedCallback& callback) = 0; 73 virtual void RequestEncodedAudioFrame( 74 const ReceiveEncodedFrameCallback& callback) = 0; 75 virtual void RequestDecodedVideoFrame( 76 const VideoFrameDecodedCallback& callback) = 0; 77 virtual void RequestEncodedVideoFrame( 78 const ReceiveEncodedFrameCallback& callback) = 0; 79 ~CastReceiver()80 virtual ~CastReceiver() {} 81 }; 82 83 } // namespace cast 84 } // namespace media 85 86 #endif // MEDIA_CAST_CAST_RECEIVER_H_ 87