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https://github.com/STMicroelectronics/STM32CubeF4.git
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114 lines
4.7 KiB
C
114 lines
4.7 KiB
C
/**
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******************************************************************************
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* @file LibJPEG/LibJPEG_Encoding/Src/decode.c
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* @author MCD Application Team
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* @brief This file contain the decompress method.
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******************************************************************************
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* @attention
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*
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* <h2><center>© Copyright (c) 2017 STMicroelectronics International N.V.
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* All rights reserved.</center></h2>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted, provided that the following conditions are met:
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*
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* 1. Redistribution of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of STMicroelectronics nor the names of other
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* contributors to this software may be used to endorse or promote products
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* derived from this software without specific written permission.
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* 4. This software, including modifications and/or derivative works of this
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* software, must execute solely and exclusively on microcontroller or
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* microprocessor devices manufactured by or for STMicroelectronics.
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* 5. Redistribution and use of this software other than as permitted under
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* this license is void and will automatically terminate your rights under
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* this license.
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*
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* THIS SOFTWARE IS PROVIDED BY STMICROELECTRONICS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS, IMPLIED OR STATUTORY WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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* PARTICULAR PURPOSE AND NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY
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* RIGHTS ARE DISCLAIMED TO THE FULLEST EXTENT PERMITTED BY LAW. IN NO EVENT
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* SHALL STMICROELECTRONICS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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******************************************************************************
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "decode.h"
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/* Private typedef -----------------------------------------------------------*/
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/* This struct contains the JPEG decompression parameters */
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struct jpeg_decompress_struct cinfo;
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/* This struct represents a JPEG error handler */
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struct jpeg_error_mgr jerr;
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/* Private define ------------------------------------------------------------*/
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* Private function prototypes -----------------------------------------------*/
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/* Private functions ---------------------------------------------------------*/
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/**
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* @brief Jpeg Decode
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* @param callback: line decoding callback
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* @param file1: pointer to the jpg file
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* @param width: image width
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* @param buff: pointer to the image line
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* @retval None
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*/
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void jpeg_decode(JFILE *file, uint32_t width, uint8_t * buff, uint8_t (*callback)(uint8_t*, uint32_t))
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{
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/* Decode JPEG Image */
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JSAMPROW buffer[2] = {0}; /* Output row buffer */
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uint32_t row_stride = 0; /* physical row width in image buffer */
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buffer[0] = buff;
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/* Step 1: allocate and initialize JPEG decompression object */
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cinfo.err = jpeg_std_error(&jerr);
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/* Initialize the JPEG decompression object */
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jpeg_create_decompress(&cinfo);
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jpeg_stdio_src (&cinfo, file);
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/* Step 3: read image parameters with jpeg_read_header() */
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jpeg_read_header(&cinfo, TRUE);
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/* Step 4: set parameters for decompression */
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cinfo.dct_method = JDCT_FLOAT;
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/* Step 5: start decompressor */
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jpeg_start_decompress(&cinfo);
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row_stride = width * 3;
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while (cinfo.output_scanline < cinfo.output_height)
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{
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(void) jpeg_read_scanlines(&cinfo, buffer, 1);
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if (callback(buffer[0], row_stride) != 0)
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{
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break;
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}
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}
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/* Step 6: Finish decompression */
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jpeg_finish_decompress(&cinfo);
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/* Step 7: Release JPEG decompression object */
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jpeg_destroy_decompress(&cinfo);
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}
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/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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