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unjpeg

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Devaev Maxim
2020-12-27 10:46:54 +03:00
parent 1e8789f5e5
commit 0949c28658
2 changed files with 122 additions and 0 deletions
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83
src/h264/unjpeg.c Normal file
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/*****************************************************************************
# #
# uStreamer - Lightweight and fast MJPG-HTTP streamer. #
# #
# Copyright (C) 2018 Maxim Devaev <mdevaev@gmail.com> #
# #
# This program is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 3 of the License, or #
# (at your option) any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program. If not, see <https://www.gnu.org/licenses/>. #
# #
*****************************************************************************/
#include "unjpeg.h"
typedef struct {
struct jpeg_error_mgr mgr; // Default manager
jmp_buf jmp;
} _jpeg_error_manager_s;
static void _jpeg_error_handler(j_common_ptr jpeg);
int unjpeg(const frame_s *src, frame_s *dest) {
struct jpeg_decompress_struct jpeg;
_jpeg_error_manager_s jpeg_error;
JSAMPARRAY scanlines;
unsigned row_stride;
volatile int retval = 0;
jpeg_create_decompress(&jpeg);
// https://stackoverflow.com/questions/19857766/error-handling-in-libjpeg
jpeg.err = jpeg_std_error((struct jpeg_error_mgr *)&jpeg_error);
jpeg_error.mgr.error_exit = _jpeg_error_handler;
if (setjmp(jpeg_error.jmp) < 0) {
retval = -1;
goto done;
}
jpeg_mem_src(&jpeg, src->data, src->used);
jpeg_read_header(&jpeg, TRUE);
jpeg.out_color_space = JCS_RGB;
jpeg_start_decompress(&jpeg);
row_stride = jpeg.output_width * jpeg.output_components;
scanlines = (*jpeg.mem->alloc_sarray)((j_common_ptr) &jpeg, JPOOL_IMAGE, row_stride, 1);
while (jpeg.output_scanline < jpeg.output_height) {
jpeg_read_scanlines(&jpeg, scanlines, 1);
frame_append_data(dest, scanlines[0], row_stride);
}
jpeg_finish_decompress(&jpeg);
dest->width = jpeg.output_width;
dest->height = jpeg.output_height;
dest->format = V4L2_PIX_FMT_RGB24;
done:
jpeg_destroy_decompress(&jpeg);
return retval;
}
static void _jpeg_error_handler(j_common_ptr jpeg) {
_jpeg_error_manager_s *jpeg_error = (_jpeg_error_manager_s *)jpeg->err;
char msg[JMSG_LENGTH_MAX];
(*jpeg_error->mgr.format_message)(jpeg, msg);
LOG_ERROR("Can't decompress JPEG: %s", msg);
longjmp(jpeg_error->jmp, -1);
}

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src/h264/unjpeg.h Normal file
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/*****************************************************************************
# #
# uStreamer - Lightweight and fast MJPG-HTTP streamer. #
# #
# Copyright (C) 2018 Maxim Devaev <mdevaev@gmail.com> #
# #
# This program is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 3 of the License, or #
# (at your option) any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program. If not, see <https://www.gnu.org/licenses/>. #
# #
*****************************************************************************/
#pragma once
#include <stdio.h>
#include <stdint.h>
#include <setjmp.h>
#include <assert.h>
#include <sys/types.h>
#include <jpeglib.h>
#include <linux/videodev2.h>
#include "../common/logging.h"
#include "../common/frame.h"
int unjpeg(const frame_s *src, frame_s *dest);