Migrate webkit/renderer/media/ to content/renderer/media/.

webkit/renderer/media/buffered_data_source.h

-// Copyright 2013 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 WEBKIT_RENDERER_MEDIA_BUFFERED_DATA_SOURCE_H_
-#define WEBKIT_RENDERER_MEDIA_BUFFERED_DATA_SOURCE_H_
-
-#include <string>
-
-#include "base/callback.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/synchronization/lock.h"
-#include "googleurl/src/gurl.h"
-#include "media/base/data_source.h"
-#include "media/base/ranges.h"
-#include "webkit/renderer/media/buffered_resource_loader.h"
-#include "webkit/renderer/media/preload.h"
-
-namespace base {
-class MessageLoopProxy;
-}
-
-namespace media {
-class MediaLog;
-}
-
-namespace webkit_media {
-
-// A data source capable of loading URLs and buffering the data using an
-// in-memory sliding window.
-//
-// BufferedDataSource must be created and initialized on the render thread
-// before being passed to other threads. It may be deleted on any thread.
-class BufferedDataSource : public media::DataSource {
- public:
-  typedef base::Callback<void(bool)> DownloadingCB;
-
-  // |downloading_cb| will be called whenever the downloading/paused state of
-  // the source changes.
-  BufferedDataSource(const scoped_refptr<base::MessageLoopProxy>& render_loop,
-                     WebKit::WebFrame* frame,
-                     media::MediaLog* media_log,
-                     const DownloadingCB& downloading_cb);
-  virtual ~BufferedDataSource();
-
-  // Initialize this object using |url| and |cors_mode|, executing |init_cb|
-  // with the result of initialization when it has completed.
-  //
-  // Method called on the render thread.
-  typedef base::Callback<void(bool)> InitializeCB;
-  void Initialize(
-      const GURL& url,
-      BufferedResourceLoader::CORSMode cors_mode,
-      const InitializeCB& init_cb);
-
-  // Adjusts the buffering algorithm based on the given preload value.
-  void SetPreload(Preload preload);
-
-  // Returns true if the media resource has a single origin, false otherwise.
-  // Only valid to call after Initialize() has completed.
-  //
-  // Method called on the render thread.
-  bool HasSingleOrigin();
-
-  // Returns true if the media resource passed a CORS access control check.
-  bool DidPassCORSAccessCheck() const;
-
-  // Cancels initialization, any pending loaders, and any pending read calls
-  // from the demuxer. The caller is expected to release its reference to this
-  // object and never call it again.
-  //
-  // Method called on the render thread.
-  void Abort();
-
-  // media::DataSource implementation.
-  // Called from demuxer thread.
-  virtual void set_host(media::DataSourceHost* host) OVERRIDE;
-  virtual void Stop(const base::Closure& closure) OVERRIDE;
-  virtual void SetPlaybackRate(float playback_rate) OVERRIDE;
-
-  virtual void Read(int64 position, int size, uint8* data,
-                    const media::DataSource::ReadCB& read_cb) OVERRIDE;
-  virtual bool GetSize(int64* size_out) OVERRIDE;
-  virtual bool IsStreaming() OVERRIDE;
-  virtual void SetBitrate(int bitrate) OVERRIDE;
-
- protected:
-  // A factory method to create a BufferedResourceLoader based on the read
-  // parameters. We can override this file to object a mock
-  // BufferedResourceLoader for testing.
-  virtual BufferedResourceLoader* CreateResourceLoader(
-      int64 first_byte_position, int64 last_byte_position);
-
- private:
-  friend class BufferedDataSourceTest;
-
-  // Task posted to perform actual reading on the render thread.
-  void ReadTask();
-
-  // Cancels oustanding callbacks and sets |stop_signal_received_|. Safe to call
-  // from any thread.
-  void StopInternal_Locked();
-
-  // Stops |loader_| if present. Used by Abort() and Stop().
-  void StopLoader();
-
-  // This task uses the current playback rate with the previous playback rate
-  // to determine whether we are going from pause to play and play to pause,
-  // and signals the buffered resource loader accordingly.
-  void SetPlaybackRateTask(float playback_rate);
-
-  // Tells |loader_| the bitrate of the media.
-  void SetBitrateTask(int bitrate);
-
-  // The method that performs actual read. This method can only be executed on
-  // the render thread.
-  void ReadInternal();
-
-  // BufferedResourceLoader::Start() callback for initial load.
-  void StartCallback(BufferedResourceLoader::Status status);
-
-  // BufferedResourceLoader::Start() callback for subsequent loads (i.e.,
-  // when accessing ranges that are outside initial buffered region).
-  void PartialReadStartCallback(BufferedResourceLoader::Status status);
-
-  // BufferedResourceLoader callbacks.
-  void ReadCallback(BufferedResourceLoader::Status status, int bytes_read);
-  void LoadingStateChangedCallback(BufferedResourceLoader::LoadingState state);
-  void ProgressCallback(int64 position);
-
-  // Report a buffered byte range [start,end] or queue it for later
-  // reporting if set_host() hasn't been called yet.
-  void ReportOrQueueBufferedBytes(int64 start, int64 end);
-
-  void UpdateHostState_Locked();
-
-  base::WeakPtrFactory<BufferedDataSource> weak_factory_;
-  base::WeakPtr<BufferedDataSource> weak_this_;
-
-  // URL of the resource requested.
-  GURL url_;
-  // crossorigin attribute on the corresponding HTML media element, if any.
-  BufferedResourceLoader::CORSMode cors_mode_;
-
-  // The total size of the resource. Set during StartCallback() if the size is
-  // known, otherwise it will remain kPositionNotSpecified until the size is
-  // determined by reaching EOF.
-  int64 total_bytes_;
-
-  // Some resources are assumed to be fully buffered (i.e., file://) so we don't
-  // need to report what |loader_| has buffered.
-  bool assume_fully_buffered_;
-
-  // This value will be true if this data source can only support streaming.
-  // i.e. range request is not supported.
-  bool streaming_;
-
-  // A webframe for loading.
-  WebKit::WebFrame* frame_;
-
-  // A resource loader for the media resource.
-  scoped_ptr<BufferedResourceLoader> loader_;
-
-  // Callback method from the pipeline for initialization.
-  InitializeCB init_cb_;
-
-  // Read parameters received from the Read() method call. Must be accessed
-  // under |lock_|.
-  class ReadOperation;
-  scoped_ptr<ReadOperation> read_op_;
-
-  // This buffer is intermediate, we use it for BufferedResourceLoader to write
-  // to. And when read in BufferedResourceLoader is done, we copy data from
-  // this buffer to |read_buffer_|. The reason for an additional copy is that
-  // we don't own |read_buffer_|. But since the read operation is asynchronous,
-  // |read_buffer| can be destroyed at any time, so we only copy into
-  // |read_buffer| in the final step when it is safe.
-  // Memory is allocated for this member during initialization of this object
-  // because we want buffer to be passed into BufferedResourceLoader to be
-  // always non-null. And by initializing this member with a default size we can
-  // avoid creating zero-sized buffered if the first read has zero size.
-  scoped_ptr<uint8[]> intermediate_read_buffer_;
-  int intermediate_read_buffer_size_;
-
-  // The message loop of the render thread.
-  const scoped_refptr<base::MessageLoopProxy> render_loop_;
-
-  // Protects |stop_signal_received_| and |read_op_|.
-  base::Lock lock_;
-
-  // Whether we've been told to stop via Abort() or Stop().
-  bool stop_signal_received_;
-
-  // This variable is true when the user has requested the video to play at
-  // least once.
-  bool media_has_played_;
-
-  // This variable holds the value of the preload attribute for the video
-  // element.
-  Preload preload_;
-
-  // Bitrate of the content, 0 if unknown.
-  int bitrate_;
-
-  // Current playback rate.
-  float playback_rate_;
-
-  // Buffered byte ranges awaiting set_host() being called to report to host().
-  media::Ranges<int64> queued_buffered_byte_ranges_;
-
-  scoped_refptr<media::MediaLog> media_log_;
-
-  DownloadingCB downloading_cb_;
-
-  DISALLOW_COPY_AND_ASSIGN(BufferedDataSource);
-};
-
-}  // namespace webkit_media
-
-#endif  // WEBKIT_RENDERER_MEDIA_BUFFERED_DATA_SOURCE_H_