Extract IVF parser from VP8 parser unittest

media/filters/ivf_parser.h

+// Copyright 2015 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_FILTERS_IVF_PARSER_H_
+#define MEDIA_FILTERS_IVF_PARSER_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "base/macros.h"
+#include "media/base/media_export.h"
+
+namespace media {
+
+#pragma pack(push, 1)
+struct MEDIA_EXPORT IvfFileHeader {
+  // Byte swap interger fields between native and (on disk) little endian.
+  void ByteSwap();
+
+  char signature[4];        // signature: 'DKIF'

[henryhsu, 2015/08/05 10:45:14]

Can we have a constant to store DKIF?
Then we can use it in many places.

[kcwu, 2015/08/05 11:05:15]

Done.

+  uint16_t version;         // version (should be 0)
+  uint16_t header_size;     // size of header in bytes
+  uint32_t fourcc;          // codec FourCC (e.g., 'VP80')
+  uint16_t width;           // width in pixels
+  uint16_t height;          // height in pixels
+  uint32_t timebase_denum;  // timebase denumerator
+  uint32_t timebase_num;    // timebase numerator. For example, if
+                            // timebase_denum is 30 and timebase_num is 2, the
+                            // unit of IvfFrameHeader.timestamp is 2/30
+                            // seconds.
+  uint32_t num_frames;      // number of frames in file
+  uint32_t unused;          // unused
+};
+static_assert(
+    sizeof(IvfFileHeader) == 32,
+    "sizeof(IvfFileHeader) must be fixed since it will be used with file IO");
+
+struct MEDIA_EXPORT IvfFrameHeader {
+  // Byte swap interger fields between native and (on disk) little endian.
+  void ByteSwap();
+
+  uint32_t frame_size;  // Size of frame in bytes (not including the header)
+  uint64_t timestamp;   // 64-bit presentation timestamp in unit timebase,
+                        // which is defined in IvfFileHeader.
+};
+static_assert(
+    sizeof(IvfFrameHeader) == 12,
+    "sizeof(IvfFrameHeader) must be fixed since it will be used with file IO");
+#pragma pack(pop)
+
+// IVF is a simple container format for video frame. It is used by libvpx to
+// transport VP8 and VP9 bitstream.
+class MEDIA_EXPORT IvfParser {
+ public:
+  IvfParser();
+
+  // Initializes the parser for IVF |stream| with size |size| and parses the
+  // file header. Returns true on success.
+  bool Initialize(const uint8_t* stream,
+                  size_t size,
+                  IvfFileHeader* file_header);
+
+  // Parses the next frame. Returns true if the next frame is parsed without
+  // error. |frame_header| will be filled with the frame header and |payload|
+  // will point to frame payload (inside the |stream| buffer given to
+  // Initialize.)
+  bool ParseNextFrame(IvfFrameHeader* frame_header, const uint8_t** payload);
+
+ private:
+  bool ParseFileHeader(IvfFileHeader* file_header);
+
+  // Current reading position of input stream.
+  const uint8_t* ptr_;
+
+  // The end position of input stream.
+  const uint8_t* end_;
+
+  DISALLOW_COPY_AND_ASSIGN(IvfParser);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_FILTERS_IVF_PARSER_H_