quirc/demo/mjpeg.h
2012-05-04 12:58:42 +12:00

54 lines
1.9 KiB
C

/* quirc -- QR-code recognition library
* Copyright (C) 2010-2012 Daniel Beer <dlbeer@gmail.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef MJPEG_H_
#define MJPEG_H_
#include <stdint.h>
#include <stdio.h>
#include <jpeglib.h>
#include <setjmp.h>
struct mjpeg_decoder {
/* The error manager must be the first item in this struct */
struct jpeg_error_mgr err;
struct jpeg_decompress_struct dinfo;
struct jpeg_source_mgr src;
jmp_buf env;
};
/* Construct an MJPEG decoder. */
void mjpeg_init(struct mjpeg_decoder *mj);
/* Free any memory allocated while decoding MJPEG frames. */
void mjpeg_free(struct mjpeg_decoder *mj);
/* Decode a single MJPEG image to the buffer given, in RGB format.
* Returns 0 on success, -1 if an error occurs (bad data, or image too
* big for buffer).
*/
int mjpeg_decode_rgb32(struct mjpeg_decoder *mj,
const uint8_t *data, int datalen,
uint8_t *out, int pitch, int max_w, int max_h);
/* Decode a single MJPEG image to the buffer given in 8-bit grayscale.
* Returns 0 on success, -1 if an error occurs.
*/
int mjpeg_decode_gray(struct mjpeg_decoder *mj,
const uint8_t *data, int datalen,
uint8_t *out, int pitch, int max_w, int max_h);
#endif