| // Copyright (c) 2012 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/time.h" |
| #include "media/base/media_export.h" |
| |
| namespace media { |
| |
| class MEDIA_EXPORT DataSourceHost { |
| public: |
| // Set the total size of the media file. |
| virtual void SetTotalBytes(int64 total_bytes) = 0; |
| |
| // Notify the host that byte range [start,end] has been buffered. |
| // TODO(fischman): remove this method when demuxing is push-based instead of |
| // pull-based. http://crbug.com/131444 |
| virtual void AddBufferedByteRange(int64 start, int64 end) = 0; |
| |
| // Notify the host that time range [start,end] has been buffered. |
| virtual void AddBufferedTimeRange(base::TimeDelta start, |
| base::TimeDelta end) = 0; |
| |
| protected: |
| virtual ~DataSourceHost(); |
| }; |
| |
| class MEDIA_EXPORT DataSource { |
| public: |
| typedef base::Callback<void(int64, int64)> StatusCallback; |
| typedef base::Callback<void(int)> ReadCB; |
| static const int kReadError; |
| |
| DataSource(); |
| |
| virtual void set_host(DataSourceHost* host); |
| |
| // Reads |size| bytes from |position| into |data|. And when the read is done |
| // or failed, |read_cb| is called with the number of bytes read or |
| // kReadError in case of error. |
| virtual void Read(int64 position, int size, uint8* data, |
| const DataSource::ReadCB& read_cb) = 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() = 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; |
| |
| // 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: |
| virtual ~DataSource(); |
| |
| DataSourceHost* host(); |
| |
| private: |
| DataSourceHost* host_; |
| |
| DISALLOW_COPY_AND_ASSIGN(DataSource); |
| }; |
| |
| } // namespace media |
| |
| #endif // MEDIA_BASE_DATA_SOURCE_H_ |