Audio/video data streaming over shared memory.

chromecast/media/cma/ipc_streamer/coded_frame_provider_host.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROMECAST_MEDIA_CMA_IPC_STREAMER_CODED_FRAME_PROVIDER_HOST_H_
+#define CHROMECAST_MEDIA_CMA_IPC_STREAMER_CODED_FRAME_PROVIDER_HOST_H_
+
+#include "base/callback.h"
+#include "base/memory/weak_ptr.h"
+#include "base/threading/thread_checker.h"
+#include "chromecast/media/cma/base/coded_frame_provider.h"
+#include "media/base/audio_decoder_config.h"
+#include "media/base/video_decoder_config.h"
+
+namespace chromecast {
+namespace media {
+class MediaMessageFifo;
+
+// CodedFrameProviderHost is a frame provider that gets the frames
+// from a media message fifo.
+class CodedFrameProviderHost : public CodedFrameProvider {
+ public:
+  // Note: if the media message fifo is located into shared memory,
+  // the caller must make sure the shared memory segment is valid
+  // during the whole lifetime of this object.
+  explicit CodedFrameProviderHost(
+      scoped_ptr<MediaMessageFifo> media_message_fifo);
+  virtual ~CodedFrameProviderHost();
+
+  // CodedFrameProvider implementation.
+  virtual void Read(const ReadCB& read_cb) OVERRIDE;
+  virtual void Flush(const base::Closure& flush_cb) OVERRIDE;
+
+  // Invoked when some data has been written into the fifo.
+  void OnFifoWriteEvent();
+  base::Closure GetFifoWriteEventCb();
+
+ private:
+  void ReadMessages();
+
+  base::ThreadChecker thread_checker_;
+
+  // Fifo holding the frames.
+  scoped_ptr<MediaMessageFifo> fifo_;
+
+  ReadCB read_cb_;
+
+  // Audio/video configuration for the next A/V buffer.
+  ::media::AudioDecoderConfig audio_config_;
+  ::media::VideoDecoderConfig video_config_;
+
+  base::WeakPtrFactory<CodedFrameProviderHost> weak_factory_;
+  base::WeakPtr<CodedFrameProviderHost> weak_this_;
+
+  DISALLOW_COPY_AND_ASSIGN(CodedFrameProviderHost);
+};
+
+}  // namespace media
+}  // namespace chromecast
+
+#endif  // CHROMECAST_MEDIA_CMA_IPC_STREAMER_CODED_FRAME_PROVIDER_HOST_H_