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66 lines
2.1 KiB
66 lines
2.1 KiB
4 months ago
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// Copyright (c) 2015 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_LIBWEBM_UTIL_H_
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#define LIBWEBM_COMMON_LIBWEBM_UTIL_H_
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#include <cstddef>
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#include <cstdint>
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#include <cstdio>
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#include <memory>
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#include <vector>
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namespace libwebm {
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const double kNanosecondsPerSecond = 1000000000.0;
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// fclose functor for wrapping FILE in std::unique_ptr.
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// TODO(tomfinegan): Move this to file_util once c++11 restrictions are
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// relaxed.
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struct FILEDeleter {
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int operator()(std::FILE* f) {
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if (f != nullptr)
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return fclose(f);
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return 0;
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}
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};
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typedef std::unique_ptr<std::FILE, FILEDeleter> FilePtr;
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struct Range {
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Range(std::size_t off, std::size_t len) : offset(off), length(len) {}
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Range() = delete;
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Range(const Range&) = default;
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Range(Range&&) = default;
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~Range() = default;
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const std::size_t offset;
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const std::size_t length;
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};
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typedef std::vector<Range> Ranges;
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// Converts |nanoseconds| to 90000 Hz clock ticks and vice versa. Each return
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// the converted value.
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std::int64_t NanosecondsTo90KhzTicks(std::int64_t nanoseconds);
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std::int64_t Khz90TicksToNanoseconds(std::int64_t khz90_ticks);
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// Returns true and stores frame offsets and lengths in |frame_ranges| when
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// |frame| has a valid VP9 super frame index. Sets |error| to true when parsing
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// fails for any reason.
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bool ParseVP9SuperFrameIndex(const std::uint8_t* frame,
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std::size_t frame_length, Ranges* frame_ranges,
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bool* error);
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// Writes |val| to |fileptr| and returns true upon success.
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bool WriteUint8(std::uint8_t val, std::FILE* fileptr);
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// Reads 2 bytes from |buf| and returns them as a uint16_t. Returns 0 when |buf|
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// is a nullptr.
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std::uint16_t ReadUint16(const std::uint8_t* buf);
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} // namespace libwebm
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#endif // LIBWEBM_COMMON_LIBWEBM_UTIL_H_
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