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 <list>
   9
  10 #include "base/callback.h"
  11 #include "base/macros.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "base/memory/weak_ptr.h"
  14 #include "base/threading/thread_checker.h"
  15 #include "media/base/audio_decoder_config.h"
  16 #include "media/base/video_decoder_config.h"
  17
  18 namespace chromecast {
  19 namespace media {
  20 class CodedFrameProvider;
  21 class DecoderBufferBase;
  22 class MediaMessageFifo;
  23
  24 // AvStreamerProxy streams audio/video data from a coded frame provider
  25 // to a media message fifo.
  26 class AvStreamerProxy {
  27  public:
  28   AvStreamerProxy();
  29   ~AvStreamerProxy();
  30
  31   // AvStreamerProxy gets frames and audio/video config
  32   // from the |frame_provider| and feed them into the |fifo|.
  33   void SetCodedFrameProvider(scoped_ptr<CodedFrameProvider> frame_provider);
  34   void SetMediaMessageFifo(scoped_ptr<MediaMessageFifo> fifo);
  35
  36   // Starts fetching A/V buffers.
  37   void Start();
  38
  39   // Stops fetching A/V buffers and flush the pending buffers,
  40   // invoking |flush_cb| when done.
  41   void StopAndFlush(const base::Closure& flush_cb);
  42
  43   // Event invoked when some data have been read from the fifo.
  44   // This means some data can now possibly be written into the fifo.
  45   void OnFifoReadEvent();
  46
  47  private:
  48   void RequestBufferIfNeeded();
  49
  50   void OnNewBuffer(const scoped_refptr<DecoderBufferBase>& buffer,
  51                    const ::media::AudioDecoderConfig& audio_config,
  52                    const ::media::VideoDecoderConfig& video_config);
  53
  54   void ProcessPendingData();
  55
  56   bool SendAudioDecoderConfig(const ::media::AudioDecoderConfig& config);
  57   bool SendVideoDecoderConfig(const ::media::VideoDecoderConfig& config);
  58   bool SendBuffer(const scoped_refptr<DecoderBufferBase>& buffer);
  59
  60   void OnStopAndFlushDone();
  61
  62   base::ThreadChecker thread_checker_;
  63
  64   scoped_ptr<CodedFrameProvider> frame_provider_;
  65
  66   // Fifo used to convey A/V configs and buffers.
  67   scoped_ptr<MediaMessageFifo> fifo_;
  68
  69   // State.
  70   bool is_running_;
  71
  72   // Indicates if there is a pending request to the coded frame provider.
  73   bool pending_read_;
  74
  75   // Pending config & buffer.
  76   // |pending_av_data_| is set as long as one of the pending audio/video
  77   // config or buffer is valid.
  78   bool pending_av_data_;
  79   ::media::AudioDecoderConfig pending_audio_config_;
  80   ::media::VideoDecoderConfig pending_video_config_;
  81   scoped_refptr<DecoderBufferBase> pending_buffer_;
  82
  83   // List of pending callbacks in StopAndFlush
  84   std::list<base::Closure> pending_stop_flush_cb_list_;
  85
  86   base::WeakPtr<AvStreamerProxy> weak_this_;
  87   base::WeakPtrFactory<AvStreamerProxy> weak_factory_;
  88
  89   DISALLOW_COPY_AND_ASSIGN(AvStreamerProxy);
  90 };
  91
  92 }  // namespace media
  93 }  // namespace chromecast
  94
  95 #endif  // CHROMECAST_MEDIA_CMA_IPC_STREAMER_AV_STREAMER_PROXY_H_