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https://github.com/pikvm/ustreamer.git
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93 lines
3.4 KiB
C
93 lines
3.4 KiB
C
/*****************************************************************************
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# #
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# uStreamer - Lightweight and fast MJPG-HTTP streamer. #
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# #
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# Copyright (C) 2018-2021 Maxim Devaev <mdevaev@gmail.com> #
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# #
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# This program is free software: you can redistribute it and/or modify #
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# it under the terms of the GNU General Public License as published by #
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# the Free Software Foundation, either version 3 of the License, or #
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# (at your option) any later version. #
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# #
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# This program is distributed in the hope that it will be useful, #
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# but WITHOUT ANY WARRANTY; without even the implied warranty of #
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
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# GNU General Public License for more details. #
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# #
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# You should have received a copy of the GNU General Public License #
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# along with this program. If not, see <https://www.gnu.org/licenses/>. #
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# #
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*****************************************************************************/
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#include "unjpeg.h"
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typedef struct {
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struct jpeg_error_mgr mgr; // Default manager
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jmp_buf jmp;
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const frame_s *frame;
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} _jpeg_error_manager_s;
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static void _jpeg_error_handler(j_common_ptr jpeg);
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int unjpeg(const frame_s *src, frame_s *dest, bool decode) {
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assert(is_jpeg(src->format));
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volatile int retval = 0;
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struct jpeg_decompress_struct jpeg;
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jpeg_create_decompress(&jpeg);
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// https://stackoverflow.com/questions/19857766/error-handling-in-libjpeg
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_jpeg_error_manager_s jpeg_error;
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jpeg.err = jpeg_std_error((struct jpeg_error_mgr *)&jpeg_error);
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jpeg_error.mgr.error_exit = _jpeg_error_handler;
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jpeg_error.frame = src;
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if (setjmp(jpeg_error.jmp) < 0) {
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retval = -1;
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goto done;
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}
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jpeg_mem_src(&jpeg, src->data, src->used);
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jpeg_read_header(&jpeg, TRUE);
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jpeg.out_color_space = JCS_RGB;
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jpeg_start_decompress(&jpeg);
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frame_copy_meta(src, dest);
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dest->format = V4L2_PIX_FMT_RGB24;
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dest->width = jpeg.output_width;
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dest->height = jpeg.output_height;
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dest->stride = jpeg.output_width * jpeg.output_components; // Row stride
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dest->used = 0;
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if (decode) {
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JSAMPARRAY scanlines;
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scanlines = (*jpeg.mem->alloc_sarray)((j_common_ptr) &jpeg, JPOOL_IMAGE, dest->stride, 1);
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frame_realloc_data(dest, ((dest->width * dest->height) << 1) * 2);
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while (jpeg.output_scanline < jpeg.output_height) {
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jpeg_read_scanlines(&jpeg, scanlines, 1);
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frame_append_data(dest, scanlines[0], dest->stride);
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}
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jpeg_finish_decompress(&jpeg);
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}
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done:
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jpeg_destroy_decompress(&jpeg);
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return retval;
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}
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static void _jpeg_error_handler(j_common_ptr jpeg) {
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_jpeg_error_manager_s *jpeg_error = (_jpeg_error_manager_s *)jpeg->err;
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char msg[JMSG_LENGTH_MAX];
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(*jpeg_error->mgr.format_message)(jpeg, msg);
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LOG_ERROR("Can't decompress %s JPEG: %s", jpeg_error->frame->name, msg);
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longjmp(jpeg_error->jmp, -1);
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}
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