a249c67504
This CL is a merge from the widevine repo of: http://go/wvgerrit/16491 Circular Buffer http://go/wvgerrit/16512 Circular Buffer Tests http://go/wvgerrit/16493 Entry Writer http://go/wvgerrit/16495 Profiled Scope http://go/wvgerrit/16500 Stats Collection http://go/wvgerrit/16543 Disallow Stats Copy or Assign http://go/wvgerrit/16514 Moving OEM Function Enum http://go/wvgerrit/16501 Defining Session Interface http://go/wvgerrit/16502 Session Definitions http://go/wvgerrit/16573 Remove code to num bytes table http://go/wvgerrit/16556 Connecting Profiler to Profiled Scope http://go/wvgerrit/16557 Android Reading Profiler History http://go/wvgerrit/16574 Adding Get Stats Method http://go/wvgerrit/16606 Seperating Session Parsing http://go/wvgerrit/16607 Adding get stats method to DRMPlugin http://go/wvgerrit/16608 Fixing Linux Build Failure http://go/wvgerrit/16612 Stop Clearing History http://go/wvgerrit/16613 Accessing profiler information using session id http://go/wvgerrit/16614 Making All Session Subsets of Global Session BUG: 25123303 BUG: 26027857 Change-Id: Ie2422e644aa631871852ea0e461695aeb7060f88
63 lines
1.9 KiB
C++
63 lines
1.9 KiB
C++
// Copyright 2016 Google Inc. All Rights Reserved.
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#ifndef WVCDM_PROFILER_CIRCULAR_BUFFER_H_
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#define WVCDM_PROFILER_CIRCULAR_BUFFER_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <vector>
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namespace wvcdm {
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namespace oemprofiler {
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class CircularBuffer {
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public:
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explicit CircularBuffer(size_t memoryBudget);
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size_t GetFreeSpace() const;
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size_t GetUsedSpace() const;
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// Add a series of bytes to the buffer. Values will remain in
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// the buffer until Remove removes them. If there is not enough
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// room for the full series, no bytes are written into the buffer.
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bool AddU8s(const uint8_t* values, size_t numValues);
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// Add a single byte to the buffer. The value will remain in the
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// buffer until Remove removes it. If the buffer is full, the
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// byte will not be written into the buffer.
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bool AddU8(uint8_t value);
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// Read a series of bytes without removing them. The start of the
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// read is from the end (the oldest entry) + offset (toward the newest
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// entry). If requested number of bytes is too large, no bytes are read
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// and the function returns false.
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bool PeekU8s(size_t offset, uint8_t* out, size_t numToRead) const;
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// Read a single byte without removing it. The read byte is at the index
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// of the oldest entry + offset (toward the newest entry). If there are
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// no bytes in the buffer the function returns false.
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bool PeekU8(size_t offset, uint8_t* out) const;
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// Remove the requested number of bytes from the buffer from oldest
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// to newest. If there are not enough bytes to remove, nothing is
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// removed and the function returns false.
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bool Remove(size_t numBytes);
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private:
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std::vector<uint8_t> buffer_;
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size_t fill_;
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size_t head_;
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size_t tail_;
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// disallow copy and assign
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CircularBuffer(const CircularBuffer&);
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void operator=(const CircularBuffer&);
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};
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} // namespace oemprofiler
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} // namespace wvcdm
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#endif
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