Index: media/base/data_source.h |
diff --git a/media/base/data_source.h b/media/base/data_source.h |
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+// Copyright (c) 2011 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 MEDIA_BASE_DATA_SOURCE_H_ |
+#define MEDIA_BASE_DATA_SOURCE_H_ |
+ |
+#include "base/callback.h" |
+#include "base/memory/ref_counted.h" |
+#include "media/base/media_export.h" |
+#include "media/base/preload.h" |
+ |
+namespace media { |
+ |
+class MEDIA_EXPORT DataSourceHost { |
+ public: |
+ virtual ~DataSourceHost(); |
+ |
+ // Set the total size of the media file. |
+ virtual void SetTotalBytes(int64 total_bytes) = 0; |
+ |
+ // Sets the total number of bytes that are buffered on the client and ready to |
+ // be played. |
+ virtual void SetBufferedBytes(int64 buffered_bytes) = 0; |
+ |
+ // Sets the flag to indicate current network activity. |
+ virtual void SetNetworkActivity(bool is_downloading_data) = 0; |
+}; |
+ |
+class MEDIA_EXPORT DataSource : public base::RefCountedThreadSafe<DataSource> { |
+ public: |
+ typedef base::Callback<void(int64, int64)> StatusCallback; |
+ typedef base::Callback<void(size_t)> ReadCallback; |
+ static const size_t kReadError; |
+ |
+ DataSource(); |
+ |
+ virtual void set_host(DataSourceHost* host); |
+ |
+ // Reads |size| bytes from |position| into |data|. And when the read is done |
+ // or failed, |read_callback| is called with the number of bytes read or |
+ // kReadError in case of error. |
+ // TODO(hclam): should change |size| to int! It makes the code so messy |
+ // with size_t and int all over the place.. |
+ virtual void Read(int64 position, size_t size, |
+ uint8* data, |
+ const DataSource::ReadCallback& read_callback) = 0; |
+ |
+ // Notifies the DataSource of a change in the current playback rate. |
+ virtual void SetPlaybackRate(float playback_rate); |
+ |
+ // Stops the DataSource. Once this is called all future Read() calls will |
+ // return an error. |
+ virtual void Stop(const base::Closure& callback) = 0; |
+ |
+ // Returns true and the file size, false if the file size could not be |
+ // retrieved. |
+ virtual bool GetSize(int64* size_out) = 0; |
+ |
+ // Returns true if we are performing streaming. In this case seeking is |
+ // not possible. |
+ virtual bool IsStreaming() = 0; |
+ |
+ // Alert the DataSource that the video preload value has been changed. |
+ virtual void SetPreload(Preload preload) = 0; |
+ |
+ // Notify the DataSource of the bitrate of the media. |
+ // Values of |bitrate| <= 0 are invalid and should be ignored. |
+ virtual void SetBitrate(int bitrate) = 0; |
+ |
+ protected: |
+ // Only allow scoped_refptr<> to delete DataSource. |
+ friend class base::RefCountedThreadSafe<DataSource>; |
+ virtual ~DataSource(); |
+ |
+ DataSourceHost* host(); |
+ |
+ private: |
+ DataSourceHost* host_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(DataSource); |
+}; |
+ |
+} // namespace media |
+ |
+#endif // MEDIA_BASE_DATA_SOURCE_H_ |