This tool demonstrates the use of the Media Foundation H.264 decoder as a sta...

media/mf/file_reader_util.h

+// Copyright (c) 2010 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.
+//
+// Borrowed from media/tools/omx_test/file_reader_util.h.
+// Added some functionalities related to timestamps on packets and Media
+// Foundation.
+
+#ifndef MEDIA_MF_FILE_READER_UTIL_H_
+#define MEDIA_MF_FILE_READER_UTIL_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/scoped_handle.h"
+#include "base/scoped_ptr.h"
+
+struct AVCodecContext;
+struct AVFormatContext;
+
+namespace media {
+
+class BitstreamConverter;
+
+// A class to help reading and parsing input file for use in omx_test.
+class FileReader {
+ public:
+  virtual ~FileReader() {}
+
+  // Initialize FileReader object, returns true if successful.
+  virtual bool Initialize() = 0;
+
+  // Read the file into |output|, and output the number of bytes read to
+  // |size|.
+  virtual void Read(uint8** output, int* size) = 0;
+};
+
+class FFmpegFileReader : public FileReader {
+ public:
+  explicit FFmpegFileReader(const std::string& filename);
+  virtual ~FFmpegFileReader();
+  virtual bool Initialize();
+  virtual void Read(uint8** output, int* size);
+
+  // Reads a video packet, converts it into Annex B stream, and allocates a
+  // buffer to |*output| and copies the contents into it. Timstamp and
+  // duration are given in 100-ns units.
+  void Read(uint8** output, int* size, int64* timestamp, int64* duration);
+  bool GetFrameRate(int* num, int* denom) const;
+  bool GetWidth(int* width) const;
+  bool GetHeight(int* height) const;
+  bool GetAspectRatio(int* num, int* denom) const;
+  int64 ConvertFFmpegTimeBaseTo100Ns(int64 time_base_unit) const;
+  bool end_of_stream() const { return end_of_stream_; }
+
+ private:
+  std::string filename_;
+  AVFormatContext* format_context_;
+  AVCodecContext* codec_context_;
+  int target_stream_;
+  scoped_ptr<media::BitstreamConverter> converter_;
+  bool end_of_stream_;
+
+  DISALLOW_COPY_AND_ASSIGN(FFmpegFileReader);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_MF_FILE_READER_UTIL_H_