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/*------------------------------------------------------------------------
* Copyright 2009 (c) Jeff Brown <spadix@users.sourceforge.net>
*
* This file is part of the ZBar Bar Code Reader.
*
* The ZBar Bar Code Reader is free software; you can redistribute it
* and/or modify it under the terms of the GNU Lesser Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* The ZBar Bar Code Reader 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 Lesser Public License for more details.
*
* You should have received a copy of the GNU Lesser Public License
* along with the ZBar Bar Code Reader; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301 USA
*
* http://sourceforge.net/projects/zbar
*------------------------------------------------------------------------*/
#include <assert.h> /* FIXME tmp debug */
#include <jerror.h>
#include <setjmp.h>
#include <stdio.h>
#include <jpeglib.h>
#undef HAVE_STDLIB_H
#include <zbar.h>
#include "image.h"
#include "video.h"
#define HAVE_LONGJMP
#ifdef HAVE_LONGJMP
typedef struct errenv_s {
struct jpeg_error_mgr err;
int valid;
jmp_buf env;
} errenv_t;
void zbar_jpeg_error(j_common_ptr cinfo)
{
errenv_t *jerr = (errenv_t *)cinfo->err;
assert(jerr->valid);
jerr->valid = 0;
longjmp(jerr->env, 1);
assert(0);
}
#endif
typedef struct zbar_src_mgr_s {
struct jpeg_source_mgr src;
const zbar_image_t *img;
} zbar_src_mgr_t;
static const JOCTET fake_eoi[2] = { 0xff, JPEG_EOI };
void init_source(j_decompress_ptr cinfo)
{
/* buffer/length refer to compressed data */
/* FIXME find img */
const zbar_image_t *img = ((zbar_src_mgr_t *)cinfo->src)->img;
cinfo->src->next_input_byte = img->data;
cinfo->src->bytes_in_buffer = img->datalen;
}
boolean fill_input_buffer(j_decompress_ptr cinfo)
{
/* buffer underrun error case */
cinfo->src->next_input_byte = fake_eoi;
cinfo->src->bytes_in_buffer = 2;
return (1);
}
void skip_input_data(j_decompress_ptr cinfo, long num_bytes)
{
if (num_bytes > 0) {
if (num_bytes < cinfo->src->bytes_in_buffer) {
cinfo->src->next_input_byte += num_bytes;
cinfo->src->bytes_in_buffer -= num_bytes;
} else {
fill_input_buffer(cinfo);
}
}
}
void term_source(j_decompress_ptr cinfo)
{
/* nothing todo */
}
struct jpeg_decompress_struct *_zbar_jpeg_decomp_create(void)
{
j_decompress_ptr cinfo = calloc(1, sizeof(struct jpeg_decompress_struct));
if (!cinfo)
return (NULL);
errenv_t *jerr = calloc(1, sizeof(errenv_t));
if (!jerr) {
free(cinfo);
return (NULL);
}
cinfo->err = jpeg_std_error(&jerr->err);
jerr->err.error_exit = zbar_jpeg_error;
jerr->valid = 1;
if (setjmp(jerr->env)) {
jpeg_destroy_decompress(cinfo);
/* FIXME TBD save error to errinfo_t */
(*cinfo->err->output_message)((j_common_ptr)cinfo);
free(jerr);
free(cinfo);
return (NULL);
}
jpeg_create_decompress(cinfo);
jerr->valid = 0;
return (cinfo);
}
void _zbar_jpeg_decomp_destroy(struct jpeg_decompress_struct *cinfo)
{
if (cinfo->err) {
free(cinfo->err);
cinfo->err = NULL;
}
if (cinfo->src) {
free(cinfo->src);
cinfo->src = NULL;
}
/* FIXME can this error? */
jpeg_destroy_decompress(cinfo);
free(cinfo);
}
/* invoke libjpeg to decompress JPEG format to luminance plane */
void _zbar_convert_jpeg_to_y(zbar_image_t *dst, const zbar_format_def_t *dstfmt,
const zbar_image_t *src,
const zbar_format_def_t *srcfmt)
{
/* create decompressor, or use cached video stream decompressor */
errenv_t *jerr = NULL;
j_decompress_ptr cinfo;
if (!src->src)
cinfo = _zbar_jpeg_decomp_create();
else {
cinfo = src->src->jpeg;
assert(cinfo);
}
if (!cinfo)
goto error;
jerr = (errenv_t *)cinfo->err;
jerr->valid = 1;
if (setjmp(jerr->env)) {
/* FIXME TBD save error to src->src->err */
(*cinfo->err->output_message)((j_common_ptr)cinfo);
if (dst->data) {
free((void *)dst->data);
dst->data = NULL;
}
dst->datalen = 0;
goto error;
}
/* setup input image */
if (!cinfo->src) {
cinfo->src = calloc(1, sizeof(zbar_src_mgr_t));
cinfo->src->init_source = init_source;
cinfo->src->fill_input_buffer = fill_input_buffer;
cinfo->src->skip_input_data = skip_input_data;
cinfo->src->resync_to_restart = jpeg_resync_to_restart;
cinfo->src->term_source = term_source;
}
cinfo->src->next_input_byte = NULL;
cinfo->src->bytes_in_buffer = 0;
((zbar_src_mgr_t *)cinfo->src)->img = src;
int rc = jpeg_read_header(cinfo, TRUE);
zprintf(30, "header: %s\n", (rc == 2) ? "tables-only" : "normal");
/* supporting color with jpeg became...complicated,
* so we skip that for now
*/
cinfo->out_color_space = JCS_GRAYSCALE;
/* FIXME set scaling based on dst->{width,height}
* then pass bigger buffer...
*/
jpeg_start_decompress(cinfo);
/* adjust dst image parameters to match(?) decompressor */
if (dst->width < cinfo->output_width) {
dst->width = cinfo->output_width;
if (dst->crop_x + dst->crop_w > dst->width)
dst->crop_w = dst->width - dst->crop_x;
}
if (dst->height < cinfo->output_height) {
dst->height = cinfo->output_height;
if (dst->crop_y + dst->crop_h > dst->height)
dst->crop_h = dst->height - dst->crop_y;
}
unsigned long datalen = (cinfo->output_width * cinfo->output_height *
cinfo->out_color_components);
zprintf(24, "dst=%dx%d %lx src=%dx%d %lx dct=%x\n", dst->width, dst->height,
dst->datalen, src->width, src->height, src->datalen,
cinfo->dct_method);
if (!dst->data) {
dst->datalen = datalen;
dst->data = malloc(dst->datalen);
dst->cleanup = zbar_image_free_data;
} else
assert(datalen <= dst->datalen);
if (!dst->data)
return;
unsigned bpl = dst->width * cinfo->output_components;
JSAMPROW buf = (void *)dst->data;
JSAMPARRAY line = &buf;
for (; cinfo->output_scanline < cinfo->output_height; buf += bpl) {
jpeg_read_scanlines(cinfo, line, 1);
/* FIXME pad out to dst->width */
}
/* FIXME always do this? */
jpeg_finish_decompress(cinfo);
error:
if (jerr)
jerr->valid = 0;
if (!src->src && cinfo)
/* cleanup only if we allocated locally */
_zbar_jpeg_decomp_destroy(cinfo);
}
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