Move H264Parser and H264BitReader to media/filters.

content/common/gpu/media/h264_bit_reader.h

-// 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.
-//
-// This file contains an implementation of an H264 Annex-B video stream parser.
-
-#ifndef CONTENT_COMMON_GPU_MEDIA_H264_BIT_READER_H_
-#define CONTENT_COMMON_GPU_MEDIA_H264_BIT_READER_H_
-
-#include <sys/types.h>
-
-#include "base/basictypes.h"
-#include "content/common/content_export.h"
-
-namespace content {
-
-// A class to provide bit-granularity reading of H.264 streams.
-// This is not a generic bit reader class, as it takes into account
-// H.264 stream-specific constraints, such as skipping emulation-prevention
-// bytes and stop bits. See spec for more details.
-class CONTENT_EXPORT H264BitReader {
- public:
-  H264BitReader();
-  ~H264BitReader();
-
-  // Initialize the reader to start reading at |data|, |size| being size
-  // of |data| in bytes.
-  // Return false on insufficient size of stream..
-  // TODO(posciak,fischman): consider replacing Initialize() with
-  // heap-allocating and creating bit readers on demand instead.
-  bool Initialize(const uint8* data, off_t size);
-
-  // Read |num_bits| next bits from stream and return in |*out|, first bit
-  // from the stream starting at |num_bits| position in |*out|.
-  // |num_bits| may be 1-32, inclusive.
-  // Return false if the given number of bits cannot be read (not enough
-  // bits in the stream), true otherwise.
-  bool ReadBits(int num_bits, int *out);
-
-  // Return the number of bits left in the stream.
-  off_t NumBitsLeft();
-
-  // See the definition of more_rbsp_data() in spec.
-  bool HasMoreRBSPData();
-
-  // Return the number of emulation prevention bytes already read.
-  size_t NumEmulationPreventionBytesRead();
-
- private:
-  // Advance to the next byte, loading it into curr_byte_.
-  // Return false on end of stream.
-  bool UpdateCurrByte();
-
-  // Pointer to the next unread (not in curr_byte_) byte in the stream.
-  const uint8* data_;
-
-  // Bytes left in the stream (without the curr_byte_).
-  off_t bytes_left_;
-
-  // Contents of the current byte; first unread bit starting at position
-  // 8 - num_remaining_bits_in_curr_byte_ from MSB.
-  int curr_byte_;
-
-  // Number of bits remaining in curr_byte_
-  int num_remaining_bits_in_curr_byte_;
-
-  // Used in emulation prevention three byte detection (see spec).
-  // Initially set to 0xffff to accept all initial two-byte sequences.
-  int prev_two_bytes_;
-
-  // Number of emulation preventation bytes (0x000003) we met.
-  size_t emulation_prevention_bytes_;
-
-  DISALLOW_COPY_AND_ASSIGN(H264BitReader);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_COMMON_GPU_MEDIA_H264_BIT_READER_H_