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LibVideo/VP9: Convert the Parser to use AK/BitStream.h

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This doesn't appear to have had a measurable impact on performance,
and behavior is the same.

With the tiles using independent BooleanDecoders with their own
backing BitStreams, we're even one step closer to threaded tiles!
This commit is contained in:
Zaggy1024 2023-02-11 19:35:26 -06:00 • committed by Linus Groh
parent 6f39c44160
commit fb0c226da3
10 changed files with 499 additions and 581 deletions
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41
Userland/Libraries/LibVideo/VP9/BooleanDecoder.h Normal file
View file

@ -0,0 +1,41 @@
/*
* Copyright (c) 2021, Hunter Salyer <thefalsehonesty@gmail.com>
* Copyright (c) 2022, Gregory Bertilson <zaggy1024@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/BitStream.h>
#include <AK/Error.h>
#include <AK/Optional.h>
#include <AK/Types.h>
namespace Video::VP9 {
class BooleanDecoder {
public:
/* (9.2) */
static ErrorOr<BooleanDecoder> initialize(MaybeOwned<BigEndianInputBitStream> bit_stream, size_t bytes);
ErrorOr<bool> read_bool(u8 probability);
ErrorOr<u8> read_literal(u8 bits);
size_t bits_remaining() const;
ErrorOr<void> finish_decode();
private:
BooleanDecoder(MaybeOwned<BigEndianInputBitStream>&& bit_stream, u8 value, u8 range, u64 bits_left)
: m_bit_stream(move(bit_stream))
, m_value(value)
, m_range(range)
, m_bits_left(bits_left)
{
}
MaybeOwned<BigEndianInputBitStream> m_bit_stream;
u8 m_value { 0 };
u8 m_range { 0 };
u64 m_bits_left { 0 };
};
}