media/filters/file_data_source.h

   1 // Copyright (c) 2012 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 MEDIA_FILTERS_FILE_DATA_SOURCE_H_
   6 #define MEDIA_FILTERS_FILE_DATA_SOURCE_H_
   7
   8 #include <string>
   9
  10 #include "base/files/file.h"
  11 #include "base/files/file_path.h"
  12 #include "base/files/memory_mapped_file.h"
  13 #include "media/base/data_source.h"
  14
  15 namespace media {
  16
  17 // Basic data source that treats the URL as a file path, and uses the file
  18 // system to read data for a media pipeline.
  19 class MEDIA_EXPORT FileDataSource : public DataSource {
  20  public:
  21   FileDataSource();
  22   explicit FileDataSource(base::File file);
  23   virtual ~FileDataSource();
  24
  25   bool Initialize(const base::FilePath& file_path);
  26
  27   // Implementation of DataSource.
  28   virtual void Stop() OVERRIDE;
  29   virtual void Read(int64 position, int size, uint8* data,
  30                     const DataSource::ReadCB& read_cb) OVERRIDE;
  31   virtual bool GetSize(int64* size_out) OVERRIDE;
  32   virtual bool IsStreaming() OVERRIDE;
  33   virtual void SetBitrate(int bitrate) OVERRIDE;
  34
  35   // Unit test helpers. Recreate the object if you want the default behaviour.
  36   void force_read_errors_for_testing() { force_read_errors_ = true; }
  37   void force_streaming_for_testing() { force_streaming_ = true; }
  38
  39  private:
  40   base::MemoryMappedFile file_;
  41
  42   bool force_read_errors_;
  43   bool force_streaming_;
  44
  45   DISALLOW_COPY_AND_ASSIGN(FileDataSource);
  46 };
  47
  48 }  // namespace media
  49
  50 #endif  // MEDIA_FILTERS_FILE_DATA_SOURCE_H_