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44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
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/*
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* SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#pragma once
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#include <stdint.h>
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#include "driver/jpeg_types.h"
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#include "../jpeg_private.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Zigzag scan pattern array.
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*
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* This array represents a zigzag scan pattern for reordering the coefficients
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* in a block of data. It is commonly used in JPEG compression and decompression
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* algorithms to optimize encoding and decoding processes.
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*
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* The array consists of 64 elements, where each element represents the position
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* of a coefficient in the zigzag pattern. The coefficients are traversed in the
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* order specified by this array to achieve efficient compression and decompression.
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*
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* @note The values in this array are zero-indexed.
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*/
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extern const uint8_t zigzag_arr[64];
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/**
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* @brief DMA2D best hb value table for JPEG decompression.
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*
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* This two-dimensional array represents a Huffman decoding table for JPEG
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* decompression. It is used to decode the Huffman-coded symbols in the compressed
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* data stream during the decoding process.
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*/
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extern const uint32_t dec_hb_tbl[JPEG_DOWN_SAMPLING_MAX][JPEG_DEC_BEST_HB_MAX];
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#ifdef __cplusplus
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}
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#endif
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