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/* jl2005bcd.c
*
* Converts raw output from Jeilin JL2005B/C/D to Bayer output.
*
* The code is based upon what is found in libgphoto2/camlibs/jl2005c,
* Copyright (c) 2010 Theodore Kilgore <kilgota@auburn.edu>
*
* The decompression code used is
* Copyright (c) 2010 Hans de Goede <hdegoede@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_JPEG
#include "libv4lconvert-priv.h"
#include "jpeg_memsrcdest.h"
#include "libv4lsyscall-priv.h"
#define JPEG_HEADER_SIZE 338
#define JPEG_HEIGHT_OFFSET 94
static int find_eoi(struct v4lconvert_data *data,
const unsigned char *jpeg_data, int jpeg_data_idx, int jpeg_data_size)
{
int i;
for (i = jpeg_data_idx; i < (jpeg_data_size - 1); i++)
if (jpeg_data[i] == 0xff && jpeg_data[i + 1] == 0xd9)
break;
if (i >= (jpeg_data_size - 1)) {
V4LCONVERT_ERR("incomplete jl2005bcd frame\n");
return -1;
}
return i + 2; /* + 2 -> Point to after EOI marker */
}
int v4lconvert_decode_jl2005bcd(struct v4lconvert_data *data,
const unsigned char *src, int src_size,
unsigned char *dest, int width, int height)
{
unsigned char jpeg_stripe[50000];
int q;
struct jpeg_compress_struct cinfo;
struct jpeg_decompress_struct dinfo;
struct jpeg_error_mgr jcerr, jderr;
JOCTET *jpeg_header = NULL;
#if JPEG_LIB_VERSION >= 90
size_t jpeg_header_size = 0;
#else
unsigned long jpeg_header_size = 0;
#endif
int i, x, y, x1, y1, jpeg_data_size, jpeg_data_idx, eoi, size;
/* src_size had better be bigger than 16 */
if (src_size < 16)
return 1;
/* The first 16 bytes of src are a raw frame header */
q = src[13] & 0x7f;
if (height != src[4] << 3) {
V4LCONVERT_ERR("Height is %d, not %d\n", src[4] << 3, height);
return 1;
}
if (width != src[5] << 3) {
V4LCONVERT_ERR("Width is %d, not %d\n", src[5] << 3, width);
return 1;
}
/*
* And the fun begins, first of all create a dummy jpeg, which we use
* to get the headers from to feed to libjpeg when decompressing the
* stripes. This way we can use libjpeg's quant table handling
* (and built in default huffman tables).
*/
cinfo.err = jpeg_std_error (&jcerr);
jpeg_create_compress (&cinfo);
jpeg_mem_dest (&cinfo, &jpeg_header, &jpeg_header_size);
cinfo.image_width = 16;
cinfo.image_height = 16;
cinfo.input_components = 3;
cinfo.in_color_space = JCS_RGB;
jpeg_set_defaults (&cinfo);
/* Make comp[0] (which will be green) 1x2 subsampled */
cinfo.comp_info[0].h_samp_factor = 1;
cinfo.comp_info[0].v_samp_factor = 2;
/* Make comp[1] and [2] use huffman table and quanttable 0, as all
* components use luminance settings with the jl2005c/d/e */
cinfo.comp_info[1].quant_tbl_no = 0;
cinfo.comp_info[1].dc_tbl_no = 0;
cinfo.comp_info[1].ac_tbl_no = 0;
cinfo.comp_info[2].quant_tbl_no = 0;
cinfo.comp_info[2].dc_tbl_no = 0;
cinfo.comp_info[2].ac_tbl_no = 0;
/* Apply the quality setting from the header */
if (q <= 0)
i = 5000;
else if (q <= 50)
i = 5000 / q;
else if (q <= 100)
i = 2 * (100 - q);
else
i = 0;
jpeg_set_linear_quality(&cinfo, i, TRUE);
jpeg_start_compress (&cinfo, TRUE);
while( cinfo.next_scanline < cinfo.image_height ) {
JOCTET row[16 * 3];
JSAMPROW row_pointer[1] = { row };
jpeg_write_scanlines (&cinfo, row_pointer, 1);
}
jpeg_finish_compress (&cinfo);
jpeg_destroy_compress (&cinfo);
JSAMPLE green[8 * 16];
JSAMPLE red[8 * 8];
JSAMPLE blue[8 * 8];
JSAMPROW green_row_pointer[16];
JSAMPROW red_row_pointer[8];
JSAMPROW blue_row_pointer[8];
for (i = 0; i < 16; i++)
green_row_pointer[i] = green + i * 8;
for (i = 0; i < 8; i++) {
red_row_pointer[i] = red + i * 8;
blue_row_pointer[i] = blue + i * 8;
}
JSAMPARRAY samp_image[3] = { green_row_pointer,
red_row_pointer,
blue_row_pointer };
memcpy(jpeg_stripe, jpeg_header, JPEG_HEADER_SIZE);
jpeg_stripe[JPEG_HEIGHT_OFFSET ] = height >> 8;
jpeg_stripe[JPEG_HEIGHT_OFFSET + 1] = height;
jpeg_stripe[JPEG_HEIGHT_OFFSET + 2] = 0;
jpeg_stripe[JPEG_HEIGHT_OFFSET + 3] = 8;
free (jpeg_header);
/* Get past the raw frame header. */
src += 16;
jpeg_data_size = src_size - 16;
jpeg_data_idx = 0;
dinfo.err = jpeg_std_error (&jderr);
jpeg_create_decompress (&dinfo);
for (x = 0; x < width; x += 16) {
eoi = find_eoi(data, src, jpeg_data_idx, jpeg_data_size);
if (eoi < 0)
return eoi;
size = eoi - jpeg_data_idx;
if ((JPEG_HEADER_SIZE + size) > sizeof(jpeg_stripe)) {
V4LCONVERT_ERR("stripe size too big %d > %zd\n",
JPEG_HEADER_SIZE + size,
sizeof(jpeg_stripe));
return 1;
}
memcpy (jpeg_stripe + JPEG_HEADER_SIZE,
src + jpeg_data_idx, size);
jpeg_mem_src (&dinfo, jpeg_stripe, JPEG_HEADER_SIZE + size);
jpeg_read_header (&dinfo, TRUE);
dinfo.raw_data_out = TRUE;
#if JPEG_LIB_VERSION >= 70
dinfo.do_fancy_upsampling = FALSE;
#endif
jpeg_start_decompress (&dinfo);
for (y = 0; y < height; y += 16) {
jpeg_read_raw_data (&dinfo, samp_image, 16);
for (y1 = 0; y1 < 16; y1 += 2) {
for (x1 = 0; x1 < 16; x1 += 2) {
dest[((y + y1 + 0) * width
+ x + x1 + 0)]
= red[y1 * 4 + x1 / 2];
dest[((y + y1 + 0) * width
+ x + x1 + 1)]
= green[y1 * 8 + x1 / 2];
dest[((y + y1 + 1) * width
+ x + x1 + 0)]
= green[y1 * 8 + 8 + x1 / 2];
dest[((y + y1 + 1) * width
+ x + x1 + 1)]
= blue[y1 * 4 + x1 / 2];
}
}
}
jpeg_finish_decompress (&dinfo);
/* Set jpeg_data_idx for the next stripe */
jpeg_data_idx = (jpeg_data_idx + size + 0x0f) & ~0x0f;
}
jpeg_destroy_decompress(&dinfo);
return 0;
}
#endif /* HAVE_JPEG */
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