content/renderer/media/rtc_video_encoder.h

   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 #ifndef CONTENT_RENDERER_MEDIA_RTC_VIDEO_ENCODER_H_
   6 #define CONTENT_RENDERER_MEDIA_RTC_VIDEO_ENCODER_H_
   7
   8 #include <vector>
   9
  10 #include "base/memory/ref_counted.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "base/memory/weak_ptr.h"
  13 #include "base/threading/thread_checker.h"
  14 #include "base/time/time.h"
  15 #include "content/common/content_export.h"
  16 #include "media/base/video_decoder_config.h"
  17 #include "third_party/webrtc/modules/video_coding/codecs/interface/video_codec_interface.h"
  18 #include "ui/gfx/geometry/size.h"
  19
  20 namespace media {
  21 class GpuVideoAcceleratorFactories;
  22 }  // namespace media
  23
  24 namespace content {
  25
  26 // RTCVideoEncoder uses a media::VideoEncodeAccelerator to implement a
  27 // webrtc::VideoEncoder class for WebRTC.  Internally, VEA methods are
  28 // trampolined to a private RTCVideoEncoder::Impl instance.  The Impl class runs
  29 // on the worker thread queried from the |gpu_factories_|, which is presently
  30 // the media thread.  RTCVideoEncoder is sychronized by webrtc::VideoSender.
  31 // webrtc::VideoEncoder methods do not run concurrently. RTCVideoEncoder is run
  32 // and destroyed on the thread it is constructed on, which is presently the
  33 // libjingle worker thread. Encode is run on ViECaptureThread. SetRates and
  34 // SetChannelParameters are run on ProcessThread or the libjingle worker thread.
  35 // Callbacks from the Impl due to its VEA::Client notifications are posted back
  36 // to RTCVideoEncoder on the libjingle worker thread.
  37 class CONTENT_EXPORT RTCVideoEncoder
  38     : NON_EXPORTED_BASE(public webrtc::VideoEncoder) {
  39  public:
  40   RTCVideoEncoder(
  41       webrtc::VideoCodecType type,
  42       const scoped_refptr<media::GpuVideoAcceleratorFactories>& gpu_factories);
  43   ~RTCVideoEncoder() override;
  44
  45   // webrtc::VideoEncoder implementation.  Tasks are posted to |impl_| using the
  46   // appropriate VEA methods.
  47   int32_t InitEncode(const webrtc::VideoCodec* codec_settings,
  48                      int32_t number_of_cores,
  49                      size_t max_payload_size) override;
  50   int32_t Encode(
  51       const webrtc::VideoFrame& input_image,
  52       const webrtc::CodecSpecificInfo* codec_specific_info,
  53       const std::vector<webrtc::VideoFrameType>* frame_types) override;
  54   int32_t RegisterEncodeCompleteCallback(
  55       webrtc::EncodedImageCallback* callback) override;
  56   int32_t Release() override;
  57   int32_t SetChannelParameters(uint32_t packet_loss, int64_t rtt) override;
  58   int32_t SetRates(uint32_t new_bit_rate, uint32_t frame_rate) override;
  59
  60  private:
  61   class Impl;
  62   friend class RTCVideoEncoder::Impl;
  63
  64   // Return an encoded output buffer to WebRTC.
  65   void ReturnEncodedImage(scoped_ptr<webrtc::EncodedImage> image,
  66                           int32 bitstream_buffer_id,
  67                           uint16 picture_id);
  68
  69   void NotifyError(int32_t error);
  70
  71   void RecordInitEncodeUMA(int32_t init_retval,
  72                            media::VideoCodecProfile profile);
  73
  74   base::ThreadChecker thread_checker_;
  75
  76   // The video codec type, as reported to WebRTC.
  77   const webrtc::VideoCodecType video_codec_type_;
  78
  79   // Factory for creating VEAs, shared memory buffers, etc.
  80   const scoped_refptr<media::GpuVideoAcceleratorFactories> gpu_factories_;
  81
  82   // webrtc::VideoEncoder encode complete callback.
  83   webrtc::EncodedImageCallback* encoded_image_callback_;
  84
  85   // The RTCVideoEncoder::Impl that does all the work.
  86   scoped_refptr<Impl> impl_;
  87
  88   // We cannot immediately return error conditions to the WebRTC user of this
  89   // class, as there is no error callback in the webrtc::VideoEncoder interface.
  90   // Instead, we cache an error status here and return it the next time an
  91   // interface entry point is called.
  92   int32_t impl_status_;
  93
  94   // Weak pointer factory for posting back VEA::Client notifications to
  95   // RTCVideoEncoder.
  96   // NOTE: Weak pointers must be invalidated before all other member variables.
  97   base::WeakPtrFactory<RTCVideoEncoder> weak_factory_;
  98
  99   DISALLOW_COPY_AND_ASSIGN(RTCVideoEncoder);
 100 };
 101
 102 }  // namespace content
 103
 104 #endif  // CONTENT_RENDERER_MEDIA_RTC_VIDEO_ENCODER_H_