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129 lines
3.7 KiB
C++
129 lines
3.7 KiB
C++
// Copyright (c) 2016 The WebM project authors. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the LICENSE file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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#ifndef LIBWEBM_COMMON_VP9_HEADER_PARSER_H_
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#define LIBWEBM_COMMON_VP9_HEADER_PARSER_H_
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#include <stddef.h>
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#include <stdint.h>
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namespace vp9_parser {
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const int kVp9FrameMarker = 2;
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const int kMinTileWidthB64 = 4;
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const int kMaxTileWidthB64 = 64;
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const int kRefFrames = 8;
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const int kRefsPerFrame = 3;
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const int kRefFrames_LOG2 = 3;
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const int kVpxCsBt601 = 1;
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const int kVpxCsSrgb = 7;
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const int kVpxCrStudioRange = 0;
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const int kVpxCrFullRange = 1;
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const int kMiSizeLog2 = 3;
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// Class to parse the header of a VP9 frame.
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class Vp9HeaderParser {
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public:
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Vp9HeaderParser()
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: frame_(NULL),
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frame_size_(0),
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bit_offset_(0),
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profile_(-1),
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show_existing_frame_(0),
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key_(0),
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altref_(0),
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error_resilient_mode_(0),
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intra_only_(0),
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reset_frame_context_(0),
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bit_depth_(0),
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color_space_(0),
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color_range_(0),
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subsampling_x_(0),
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subsampling_y_(0),
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refresh_frame_flags_(0),
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width_(0),
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height_(0),
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row_tiles_(0),
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column_tiles_(0),
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frame_parallel_mode_(0) {}
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// Parse the VP9 uncompressed header. The return values of the remaining
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// functions are only valid on success.
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bool ParseUncompressedHeader(const uint8_t* frame, size_t length);
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size_t frame_size() const { return frame_size_; }
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int profile() const { return profile_; }
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int key() const { return key_; }
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int altref() const { return altref_; }
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int error_resilient_mode() const { return error_resilient_mode_; }
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int bit_depth() const { return bit_depth_; }
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int color_space() const { return color_space_; }
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int width() const { return width_; }
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int height() const { return height_; }
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int display_width() const { return display_width_; }
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int display_height() const { return display_height_; }
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int refresh_frame_flags() const { return refresh_frame_flags_; }
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int row_tiles() const { return row_tiles_; }
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int column_tiles() const { return column_tiles_; }
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int frame_parallel_mode() const { return frame_parallel_mode_; }
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private:
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// Set the compressed VP9 frame.
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bool SetFrame(const uint8_t* frame, size_t length);
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// Returns the next bit of the frame.
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int ReadBit();
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// Returns the next |bits| of the frame.
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int VpxReadLiteral(int bits);
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// Returns true if the vp9 sync code is valid.
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bool ValidateVp9SyncCode();
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// Parses bit_depth_, color_space_, subsampling_x_, subsampling_y_, and
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// color_range_.
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void ParseColorSpace();
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// Parses width and height of the frame.
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void ParseFrameResolution();
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// Parses frame_parallel_mode_. This function skips over some features.
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void ParseFrameParallelMode();
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// Parses row and column tiles. This function skips over some features.
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void ParseTileInfo();
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void SkipDeltaQ();
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int AlignPowerOfTwo(int value, int n);
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const uint8_t* frame_;
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size_t frame_size_;
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size_t bit_offset_;
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int profile_;
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int show_existing_frame_;
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int key_;
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int altref_;
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int error_resilient_mode_;
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int intra_only_;
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int reset_frame_context_;
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int bit_depth_;
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int color_space_;
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int color_range_;
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int subsampling_x_;
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int subsampling_y_;
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int refresh_frame_flags_;
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int width_;
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int height_;
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int display_width_;
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int display_height_;
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int row_tiles_;
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int column_tiles_;
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int frame_parallel_mode_;
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};
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} // namespace vp9_parser
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#endif // LIBWEBM_COMMON_VP9_HEADER_PARSER_H_
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