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https://github.com/fergalmoran/ladybird.git
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b37ea6b414
Errors are propagated to the user of the decoder so that they can be aware of specific places where a read failed.
47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
/*
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* Copyright (c) 2021, Hunter Salyer <thefalsehonesty@gmail.com>
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* Copyright (c) 2022, Gregory Bertilson <zaggy1024@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include "Parser.h"
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#include <AK/ByteBuffer.h>
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#include <AK/Error.h>
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namespace Video::VP9 {
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class Decoder {
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friend class Parser;
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public:
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Decoder();
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ErrorOr<void> decode_frame(ByteBuffer const&);
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void dump_frame_info();
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private:
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/* (8.4) Probability Adaptation Process */
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u8 merge_prob(u8 pre_prob, u8 count_0, u8 count_1, u8 count_sat, u8 max_update_factor);
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u8 merge_probs(int const* tree, int index, u8* probs, u8* counts, u8 count_sat, u8 max_update_factor);
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ErrorOr<void> adapt_coef_probs();
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ErrorOr<void> adapt_non_coef_probs();
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void adapt_probs(int const* tree, u8* probs, u8* counts);
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u8 adapt_prob(u8 prob, u8 counts[2]);
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/* (8.5) Prediction Processes */
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ErrorOr<void> predict_intra(size_t plane, u32 x, u32 y, bool have_left, bool have_above, bool not_on_right, TXSize tx_size, u32 block_index);
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ErrorOr<void> predict_inter(size_t plane, u32 x, u32 y, u32 w, u32 h, u32 block_index);
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/* (8.6) Reconstruction and Dequantization */
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ErrorOr<void> reconstruct(size_t plane, u32 x, u32 y, TXSize size);
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/* (8.10) Reference Frame Update Process */
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ErrorOr<void> update_reference_frames();
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NonnullOwnPtr<Parser> m_parser;
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};
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}
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