chromecast/media/cma/ipc_streamer/av_streamer_proxy.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 CHROMECAST_MEDIA_CMA_IPC_STREAMER_AV_STREAMER_PROXY_H_
   6 #define CHROMECAST_MEDIA_CMA_IPC_STREAMER_AV_STREAMER_PROXY_H_
   7
   8 #include "base/callback.h"
   9 #include "base/macros.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/memory/weak_ptr.h"
  12 #include "base/threading/thread_checker.h"
  13 #include "media/base/audio_decoder_config.h"
  14 #include "media/base/video_decoder_config.h"
  15
  16 namespace chromecast {
  17 namespace media {
  18 class CodedFrameProvider;
  19 class DecoderBufferBase;
  20 class MediaMessageFifo;
  21
  22 // AvStreamerProxy streams audio/video data from a coded frame provider
  23 // to a media message fifo.
  24 class AvStreamerProxy {
  25  public:
  26   AvStreamerProxy();
  27   ~AvStreamerProxy();
  28
  29   // AvStreamerProxy gets frames and audio/video config
  30   // from the |frame_provider| and feed them into the |fifo|.
  31   void SetCodedFrameProvider(scoped_ptr<CodedFrameProvider> frame_provider);
  32   void SetMediaMessageFifo(scoped_ptr<MediaMessageFifo> fifo);
  33
  34   // Starts fetching A/V buffers.
  35   void Start();
  36
  37   // Stops fetching A/V buffers and flush the pending buffers,
  38   // invoking |flush_cb| when done.
  39   void StopAndFlush(const base::Closure& flush_cb);
  40
  41   // Event invoked when some data have been read from the fifo.
  42   // This means some data can now possibly be written into the fifo.
  43   void OnFifoReadEvent();
  44
  45  private:
  46   void RequestBufferIfNeeded();
  47
  48   void OnNewBuffer(const scoped_refptr<DecoderBufferBase>& buffer,
  49                    const ::media::AudioDecoderConfig& audio_config,
  50                    const ::media::VideoDecoderConfig& video_config);
  51
  52   void ProcessPendingData();
  53
  54   bool SendAudioDecoderConfig(const ::media::AudioDecoderConfig& config);
  55   bool SendVideoDecoderConfig(const ::media::VideoDecoderConfig& config);
  56   bool SendBuffer(const scoped_refptr<DecoderBufferBase>& buffer);
  57
  58   base::ThreadChecker thread_checker_;
  59
  60   scoped_ptr<CodedFrameProvider> frame_provider_;
  61
  62   // Fifo used to convey A/V configs and buffers.
  63   scoped_ptr<MediaMessageFifo> fifo_;
  64
  65   // State.
  66   bool is_running_;
  67
  68   // Indicates if there is a pending request to the coded frame provider.
  69   bool pending_read_;
  70
  71   // Pending config & buffer.
  72   // |pending_av_data_| is set as long as one of the pending audio/video
  73   // config or buffer is valid.
  74   bool pending_av_data_;
  75   ::media::AudioDecoderConfig pending_audio_config_;
  76   ::media::VideoDecoderConfig pending_video_config_;
  77   scoped_refptr<DecoderBufferBase> pending_buffer_;
  78
  79   base::WeakPtr<AvStreamerProxy> weak_this_;
  80   base::WeakPtrFactory<AvStreamerProxy> weak_factory_;
  81
  82   DISALLOW_COPY_AND_ASSIGN(AvStreamerProxy);
  83 };
  84
  85 }  // namespace media
  86 }  // namespace chromecast
  87
  88 #endif  // CHROMECAST_MEDIA_CMA_IPC_STREAMER_AV_STREAMER_PROXY_H_