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| 1 // Copyright 2013 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #ifndef MEDIA_CAST_AUDIO_SENDER_H_ | 5 #ifndef MEDIA_CAST_SENDER_AUDIO_SENDER_H_ |
| 6 #define MEDIA_CAST_AUDIO_SENDER_H_ | 6 #define MEDIA_CAST_SENDER_AUDIO_SENDER_H_ |
| 7 | 7 |
| 8 #include "base/callback.h" | 8 #include "base/callback.h" |
| 9 #include "base/memory/ref_counted.h" | 9 #include "base/memory/ref_counted.h" |
| 10 #include "base/memory/scoped_ptr.h" | 10 #include "base/memory/scoped_ptr.h" |
| 11 #include "base/memory/weak_ptr.h" | 11 #include "base/memory/weak_ptr.h" |
| 12 #include "base/threading/non_thread_safe.h" | 12 #include "base/threading/non_thread_safe.h" |
| 13 #include "base/time/tick_clock.h" | 13 #include "base/time/tick_clock.h" |
| 14 #include "base/time/time.h" | 14 #include "base/time/time.h" |
| 15 #include "media/base/audio_bus.h" | 15 #include "media/base/audio_bus.h" |
| 16 #include "media/cast/cast_config.h" | 16 #include "media/cast/cast_config.h" |
| 17 #include "media/cast/cast_environment.h" | 17 #include "media/cast/cast_environment.h" |
| 18 #include "media/cast/logging/logging_defines.h" | 18 #include "media/cast/logging/logging_defines.h" |
| 19 #include "media/cast/rtcp/rtcp.h" | 19 #include "media/cast/net/rtcp/rtcp.h" |
| 20 #include "media/cast/rtp_timestamp_helper.h" | 20 #include "media/cast/sender/rtp_timestamp_helper.h" |
| 21 | 21 |
| 22 namespace media { | 22 namespace media { |
| 23 namespace cast { | 23 namespace cast { |
| 24 | 24 |
| 25 class AudioEncoder; | 25 class AudioEncoder; |
| 26 | 26 |
| 27 // Not thread safe. Only called from the main cast thread. | 27 // Not thread safe. Only called from the main cast thread. |
| 28 // This class owns all objects related to sending audio, objects that create RTP | 28 // This class owns all objects related to sending audio, objects that create RTP |
| 29 // packets, congestion control, audio encoder, parsing and sending of | 29 // packets, congestion control, audio encoder, parsing and sending of |
| 30 // RTCP packets. | 30 // RTCP packets. |
| 31 // Additionally it posts a bunch of delayed tasks to the main thread for various | 31 // Additionally it posts a bunch of delayed tasks to the main thread for various |
| 32 // timeouts. | 32 // timeouts. |
| 33 class AudioSender : public RtcpSenderFeedback, | 33 class AudioSender : public RtcpSenderFeedback, |
| 34 public base::NonThreadSafe, | 34 public base::NonThreadSafe, |
| 35 public base::SupportsWeakPtr<AudioSender> { | 35 public base::SupportsWeakPtr<AudioSender> { |
| 36 public: | 36 public: |
| 37 AudioSender(scoped_refptr<CastEnvironment> cast_environment, | 37 AudioSender(scoped_refptr<CastEnvironment> cast_environment, |
| 38 const AudioSenderConfig& audio_config, | 38 const AudioSenderConfig& audio_config, |
| 39 transport::CastTransportSender* const transport_sender); | 39 CastTransportSender* const transport_sender); |
| 40 | 40 |
| 41 virtual ~AudioSender(); | 41 virtual ~AudioSender(); |
| 42 | 42 |
| 43 CastInitializationStatus InitializationResult() const { | 43 CastInitializationStatus InitializationResult() const { |
| 44 return cast_initialization_status_; | 44 return cast_initialization_status_; |
| 45 } | 45 } |
| 46 | 46 |
| 47 // Note: It is not guaranteed that |audio_frame| will actually be encoded and | 47 // Note: It is not guaranteed that |audio_frame| will actually be encoded and |
| 48 // sent, if AudioSender detects too many frames in flight. Therefore, clients | 48 // sent, if AudioSender detects too many frames in flight. Therefore, clients |
| 49 // should be careful about the rate at which this method is called. | 49 // should be careful about the rate at which this method is called. |
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| 75 void ResendCheck(); | 75 void ResendCheck(); |
| 76 void ResendForKickstart(); | 76 void ResendForKickstart(); |
| 77 | 77 |
| 78 // Returns true if there are too many frames in flight, as defined by the | 78 // Returns true if there are too many frames in flight, as defined by the |
| 79 // configured target playout delay plus simple logic. When this is true, | 79 // configured target playout delay plus simple logic. When this is true, |
| 80 // InsertAudio() will silenty drop frames instead of sending them to the audio | 80 // InsertAudio() will silenty drop frames instead of sending them to the audio |
| 81 // encoder. | 81 // encoder. |
| 82 bool AreTooManyFramesInFlight() const; | 82 bool AreTooManyFramesInFlight() const; |
| 83 | 83 |
| 84 // Called by the |audio_encoder_| with the next EncodedFrame to send. | 84 // Called by the |audio_encoder_| with the next EncodedFrame to send. |
| 85 void SendEncodedAudioFrame(scoped_ptr<transport::EncodedFrame> audio_frame); | 85 void SendEncodedAudioFrame(scoped_ptr<EncodedFrame> audio_frame); |
| 86 | 86 |
| 87 const scoped_refptr<CastEnvironment> cast_environment_; | 87 const scoped_refptr<CastEnvironment> cast_environment_; |
| 88 | 88 |
| 89 // The total amount of time between a frame's capture/recording on the sender | 89 // The total amount of time between a frame's capture/recording on the sender |
| 90 // and its playback on the receiver (i.e., shown to a user). This is fixed as | 90 // and its playback on the receiver (i.e., shown to a user). This is fixed as |
| 91 // a value large enough to give the system sufficient time to encode, | 91 // a value large enough to give the system sufficient time to encode, |
| 92 // transmit/retransmit, receive, decode, and render; given its run-time | 92 // transmit/retransmit, receive, decode, and render; given its run-time |
| 93 // environment (sender/receiver hardware performance, network conditions, | 93 // environment (sender/receiver hardware performance, network conditions, |
| 94 // etc.). | 94 // etc.). |
| 95 const base::TimeDelta target_playout_delay_; | 95 const base::TimeDelta target_playout_delay_; |
| 96 | 96 |
| 97 // Sends encoded frames over the configured transport (e.g., UDP). In | 97 // Sends encoded frames over the configured transport (e.g., UDP). In |
| 98 // Chromium, this could be a proxy that first sends the frames from a renderer | 98 // Chromium, this could be a proxy that first sends the frames from a renderer |
| 99 // process to the browser process over IPC, with the browser process being | 99 // process to the browser process over IPC, with the browser process being |
| 100 // responsible for "packetizing" the frames and pushing packets into the | 100 // responsible for "packetizing" the frames and pushing packets into the |
| 101 // network layer. | 101 // network layer. |
| 102 transport::CastTransportSender* const transport_sender_; | 102 CastTransportSender* const transport_sender_; |
| 103 | 103 |
| 104 // Maximum number of outstanding frames before the encoding and sending of | 104 // Maximum number of outstanding frames before the encoding and sending of |
| 105 // new frames shall halt. | 105 // new frames shall halt. |
| 106 const int max_unacked_frames_; | 106 const int max_unacked_frames_; |
| 107 | 107 |
| 108 // Encodes AudioBuses into EncodedFrames. | 108 // Encodes AudioBuses into EncodedFrames. |
| 109 scoped_ptr<AudioEncoder> audio_encoder_; | 109 scoped_ptr<AudioEncoder> audio_encoder_; |
| 110 const int configured_encoder_bitrate_; | 110 const int configured_encoder_bitrate_; |
| 111 | 111 |
| 112 // Manages sending/receiving of RTCP packets, including sender/receiver | 112 // Manages sending/receiving of RTCP packets, including sender/receiver |
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| 152 | 152 |
| 153 // NOTE: Weak pointers must be invalidated before all other member variables. | 153 // NOTE: Weak pointers must be invalidated before all other member variables. |
| 154 base::WeakPtrFactory<AudioSender> weak_factory_; | 154 base::WeakPtrFactory<AudioSender> weak_factory_; |
| 155 | 155 |
| 156 DISALLOW_COPY_AND_ASSIGN(AudioSender); | 156 DISALLOW_COPY_AND_ASSIGN(AudioSender); |
| 157 }; | 157 }; |
| 158 | 158 |
| 159 } // namespace cast | 159 } // namespace cast |
| 160 } // namespace media | 160 } // namespace media |
| 161 | 161 |
| 162 #endif // MEDIA_CAST_AUDIO_SENDER_H_ | 162 #endif // MEDIA_CAST_SENDER_AUDIO_SENDER_H_ |
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