/*
* Copyright (C)2011-2012, 2014-2015, 2017, 2019 D. R. Commander.
* All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - Neither the name of the libjpeg-turbo Project nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS",
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This program demonstrates how to compress, decompress, and transform JPEG
* images using the TurboJPEG C API
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <turbojpeg.h>
#ifdef _WIN32
#define strcasecmp stricmp
#define strncasecmp strnicmp
#endif
#define THROW(action, message) { \
printf("ERROR in line %d while %s:\n%s\n", __LINE__, action, message); \
retval = -1; goto bailout; \
}
#define THROW_TJ(action) THROW(action, tjGetErrorStr2(tjInstance))
#define THROW_UNIX(action) THROW(action, strerror(errno))
#define DEFAULT_SUBSAMP TJSAMP_444
#define DEFAULT_QUALITY 95
const char *subsampName[TJ_NUMSAMP] = {
"4:4:4", "4:2:2", "4:2:0", "Grayscale", "4:4:0", "4:1:1"
};
const char *colorspaceName[TJ_NUMCS] = {
"RGB", "YCbCr", "GRAY", "CMYK", "YCCK"
};
tjscalingfactor *scalingFactors = NULL;
int numScalingFactors = 0;
/* DCT filter example. This produces a negative of the image. */
static int customFilter(short *coeffs, tjregion arrayRegion,
tjregion planeRegion, int componentIndex,
int transformIndex, tjtransform *transform)
{
int i;
for (i = 0; i < arrayRegion.w * arrayRegion.h; i++)
coeffs[i] = -coeffs[i];
return 0;
}
static void usage(char *programName)
{
int i;
printf("\nUSAGE: %s <Input image> <Output image> [options]\n\n",
programName);
printf("Input and output images can be in Windows BMP or PBMPLUS (PPM/PGM) format. If\n");
printf("either filename ends in a .jpg extension, then the TurboJPEG API will be used\n");
printf("to compress or decompress the image.\n\n");
printf("Compression Options (used if the output image is a JPEG image)\n");
printf("--------------------------------------------------------------\n\n");
printf("-subsamp <444|422|420|gray> = Apply this level of chrominance subsampling when\n");
printf(" compressing the output image. The default is to use the same level of\n");
printf(" subsampling as in the input image, if the input image is also a JPEG\n");
printf(" image, or to use grayscale if the input image is a grayscale non-JPEG\n");
printf(" image, or to use %s subsampling otherwise.\n\n",
subsampName[DEFAULT_SUBSAMP]);
printf("-q <1-100> = Compress the output image with this JPEG quality level\n");
printf(" (default = %d).\n\n", DEFAULT_QUALITY);
printf("Decompression Options (used if the input image is a JPEG image)\n");
printf("---------------------------------------------------------------\n\n");
printf("-scale M/N = Scale the input image by a factor of M/N when decompressing it.\n");
printf("(M/N = ");
for (i = 0; i < numScalingFactors; i++) {
printf("%d/%d", scalingFactors[i].num, scalingFactors[i].denom);
if (numScalingFactors == 2 && i != numScalingFactors - 1)
printf(" or ");
else if (numScalingFactors > 2) {
if (i != numScalingFactors - 1)
printf(", ");
if (i == numScalingFactors - 2)
printf("or ");
}
}
printf(")\n\n");
printf("-hflip, -vflip, -transpose, -transverse, -rot90, -rot180, -rot270 =\n");
printf(" Perform one of these lossless transform operations on the input image\n");
printf(" prior to decompressing it (these options are mutually exclusive.)\n\n");
printf("-grayscale = Perform lossless grayscale conversion on the input image prior\n");
printf(" to decompressing it (can be combined with the other transform operations\n");
printf(" above.)\n\n");
printf("-crop WxH+X+Y = Perform lossless cropping on the input image prior to\n");
printf(" decompressing it. X and Y specify the upper left corner of the cropping\n");
printf(" region, and W and H specify the width and height of the cropping region.\n");
printf(" X and Y must be evenly divible by the MCU block size (8x8 if the input\n");
printf(" image was compressed using no subsampling or grayscale, 16x8 if it was\n");
printf(" compressed using 4:2:2 subsampling, or 16x16 if it was compressed using\n");
printf(" 4:2:0 subsampling.)\n\n");
printf("General Options\n");
printf("---------------\n\n");
printf("-fastupsample = Use the fastest chrominance upsampling algorithm available in\n");
printf(" the underlying codec.\n\n");
printf("-fastdct = Use the fastest DCT/IDCT algorithms available in the underlying\n");
printf(" codec.\n\n");
printf("-accuratedct = Use the most accurate DCT/IDCT algorithms available in the\n");
printf(" underlying codec.\n\n");
exit(1);
}
int main(int argc, char **argv)
{
tjscalingfactor scalingFactor = { 1, 1 };
int outSubsamp = -1, outQual = -1;
tjtransform xform;
int flags = 0;
int width, height;
char *inFormat, *outFormat;
FILE *jpegFile = NULL;
unsigned char *imgBuf = NULL, *jpegBuf = NULL;
int retval = 0, i, pixelFormat = TJPF_UNKNOWN;
tjhandle tjInstance = NULL;
if ((scalingFactors = tjGetScalingFactors(&numScalingFactors)) == NULL)
THROW_TJ("getting scaling factors");
memset(&xform, 0, sizeof(tjtransform));
if (argc < 3)
usage(argv[0]);
/* Parse arguments. */
for (i = 3; i < argc; i++) {
if (!strncasecmp(argv[i], "-sc", 3) && i < argc - 1) {
int match = 0, temp1 = 0, temp2 = 0, j;
if (sscanf(argv[++i], "%d/%d", &temp1, &temp2) < 2)
usage(argv[0]);
for (j = 0; j < numScalingFactors; j++) {
if ((double)temp1 / (double)temp2 == (double)scalingFactors[j].num /
(double)scalingFactors[j].denom) {
scalingFactor = scalingFactors[j];
match = 1;
break;
}
}
if (match != 1)
usage(argv[0]);
} else if (!strncasecmp(argv[i], "-su", 3) && i < argc - 1) {
i++;
if (!strncasecmp(argv[i], "g", 1))
outSubsamp = TJSAMP_GRAY;
else if (!strcasecmp(argv[i], "444"))
outSubsamp = TJSAMP_444;
else if (!strcasecmp(argv[i], "422"))
outSubsamp = TJSAMP_422;
else if (!strcasecmp(argv[i], "420"))
outSubsamp = TJSAMP_420;
else
usage(argv[0]);
} else if (!strncasecmp(argv[i], "-q", 2) && i < argc - 1) {
outQual = atoi(argv[++i]);
if (outQual < 1 || outQual > 100)
usage(argv[0]);
} else if (!strncasecmp(argv[i], "-g", 2))
xform.options |= TJXOPT_GRAY;
else if (!strcasecmp(argv[i], "-hflip"))
xform.op = TJXOP_HFLIP;
else if (!strcasecmp(argv[i], "-vflip"))
xform.op = TJXOP_VFLIP;
else if (!strcasecmp(argv[i], "-transpose"))
xform.op = TJXOP_TRANSPOSE;
else if (!strcasecmp(argv[i], "-transverse"))
xform.op = TJXOP_TRANSVERSE;
else if (!strcasecmp(argv[i], "-rot90"))
xform.op = TJXOP_ROT90;
else if (!strcasecmp(argv[i], "-rot180"))
xform.op = TJXOP_ROT180;
else if (!strcasecmp(argv[i], "-rot270"))
xform.op = TJXOP_ROT270;
else if (!strcasecmp(argv[i], "-custom"))
xform.customFilter = customFilter;
else if (!strncasecmp(argv[i], "-c", 2) && i < argc - 1) {
if (sscanf(argv[++i], "%dx%d+%d+%d", &xform.r.w, &xform.r.h, &xform.r.x,
&xform.r.y) < 4 ||
xform.r.x < 0 || xform.r.y < 0 || xform.r.w < 1 || xform.r.h < 1)
usage(argv[0]);
xform.options |= TJXOPT_CROP;
} else if (!strcasecmp(argv[i], "-fastupsample")) {
printf("Using fast upsampling code\n");
flags |= TJFLAG_FASTUPSAMPLE;
} else if (!strcasecmp(argv[i], "-fastdct")) {
printf("Using fastest DCT/IDCT algorithm\n");
flags |= TJFLAG_FASTDCT;
} else if (!strcasecmp(argv[i], "-accuratedct")) {
printf("Using most accurate DCT/IDCT algorithm\n");
flags |= TJFLAG_ACCURATEDCT;
} else usage(argv[0]);
}
/* Determine input and output image formats based on file extensions. */
inFormat = strrchr(argv[1], '.');
outFormat = strrchr(argv[2], '.');
if (inFormat == NULL || outFormat == NULL || strlen(inFormat) < 2 ||
strlen(outFormat) < 2)
usage(argv[0]);
inFormat = &inFormat[1];
outFormat = &outFormat[1];
if (!strcasecmp(inFormat, "jpg")) {
/* Input image is a JPEG image. Decompress and/or transform it. */
long size;
int inSubsamp, inColorspace;
int doTransform = (xform.op != TJXOP_NONE || xform.options != 0 ||
xform.customFilter != NULL);
unsigned long jpegSize;
/* Read the JPEG file into memory. */
if ((jpegFile = fopen(argv[1], "rb")) == NULL)
THROW_UNIX("opening input file");
if (fseek(jpegFile, 0, SEEK_END) < 0 || ((size = ftell(jpegFile)) < 0) ||
fseek(jpegFile, 0, SEEK_SET) < 0)
THROW_UNIX("determining input file size");
if (size == 0)
THROW("determining input file size", "Input file contains no data");
jpegSize = (unsigned long)size;
if ((jpegBuf = (unsigned char *)tjAlloc(jpegSize)) == NULL)
THROW_UNIX("allocating JPEG buffer");
if (fread(jpegBuf, jpegSize, 1, jpegFile) < 1)
THROW_UNIX("reading input file");
fclose(jpegFile); jpegFile = NULL;
if (doTransform) {
/* Transform it. */
unsigned char *dstBuf = NULL; /* Dynamically allocate the JPEG buffer */
unsigned long dstSize = 0;
if ((tjInstance = tjInitTransform()) == NULL)
THROW_TJ("initializing transformer");
xform.options |= TJXOPT_TRIM;
if (tjTransform(tjInstance, jpegBuf, jpegSize, 1, &dstBuf, &dstSize,
&xform, flags) < 0)
THROW_TJ("transforming input image");
tjFree(jpegBuf);
jpegBuf = dstBuf;
jpegSize = dstSize;
} else {
if ((tjInstance = tjInitDecompress()) == NULL)
THROW_TJ("initializing decompressor");
}
if (tjDecompressHeader3(tjInstance, jpegBuf, jpegSize, &width, &height,
&inSubsamp, &inColorspace) < 0)
THROW_TJ("reading JPEG header");
printf("%s Image: %d x %d pixels, %s subsampling, %s colorspace\n",
(doTransform ? "Transformed" : "Input"), width, height,
subsampName[inSubsamp], colorspaceName[inColorspace]);
if (!strcasecmp(outFormat, "jpg") && doTransform &&
scalingFactor.num == 1 && scalingFactor.denom == 1 && outSubsamp < 0 &&
outQual < 0) {
/* Input image has been transformed, and no re-compression options
have been selected. Write the transformed image to disk and exit. */
if ((jpegFile = fopen(argv[2], "wb")) == NULL)
THROW_UNIX("opening output file");
if (fwrite(jpegBuf, jpegSize, 1, jpegFile) < 1)
THROW_UNIX("writing output file");
fclose(jpegFile); jpegFile = NULL;
goto bailout;
}
/* Scaling and/or a non-JPEG output image format and/or compression options
have been selected, so we need to decompress the input/transformed
image. */
width = TJSCALED(width, scalingFactor);
height = TJSCALED(height, scalingFactor);
if (outSubsamp < 0)
outSubsamp = inSubsamp;
pixelFormat = TJPF_BGRX;
if ((imgBuf = (unsigned char *)tjAlloc(width * height *
tjPixelSize[pixelFormat])) == NULL)
THROW_UNIX("allocating uncompressed image buffer");
if (tjDecompress2(tjInstance, jpegBuf, jpegSize, imgBuf, width, 0, height,
pixelFormat, flags) < 0)
THROW_TJ("decompressing JPEG image");
tjFree(jpegBuf); jpegBuf = NULL;
tjDestroy(tjInstance); tjInstance = NULL;
} else {
/* Input image is not a JPEG image. Load it into memory. */
if ((imgBuf = tjLoadImage(argv[1], &width, 1, &height, &pixelFormat,
0)) == NULL)
THROW_TJ("loading input image");
if (outSubsamp < 0) {
if (pixelFormat == TJPF_GRAY)
outSubsamp = TJSAMP_GRAY;
else
outSubsamp = TJSAMP_444;
}
printf("Input Image: %d x %d pixels\n", width, height);
}
printf("Output Image (%s): %d x %d pixels", outFormat, width, height);
if (!strcasecmp(outFormat, "jpg")) {
/* Output image format is JPEG. Compress the uncompressed image. */
unsigned long jpegSize = 0;
jpegBuf = NULL; /* Dynamically allocate the JPEG buffer */
if (outQual < 0)
outQual = DEFAULT_QUALITY;
printf(", %s subsampling, quality = %d\n", subsampName[outSubsamp],
outQual);
if ((tjInstance = tjInitCompress()) == NULL)
THROW_TJ("initializing compressor");
if (tjCompress2(tjInstance, imgBuf, width, 0, height, pixelFormat,
&jpegBuf, &jpegSize, outSubsamp, outQual, flags) < 0)
THROW_TJ("compressing image");
tjDestroy(tjInstance); tjInstance = NULL;
/* Write the JPEG image to disk. */
if ((jpegFile = fopen(argv[2], "wb")) == NULL)
THROW_UNIX("opening output file");
if (fwrite(jpegBuf, jpegSize, 1, jpegFile) < 1)
THROW_UNIX("writing output file");
tjDestroy(tjInstance); tjInstance = NULL;
fclose(jpegFile); jpegFile = NULL;
tjFree(jpegBuf); jpegBuf = NULL;
} else {
/* Output image format is not JPEG. Save the uncompressed image
directly to disk. */
printf("\n");
if (tjSaveImage(argv[2], imgBuf, width, 0, height, pixelFormat, 0) < 0)
THROW_TJ("saving output image");
}
bailout:
tjFree(imgBuf);
if (tjInstance) tjDestroy(tjInstance);
tjFree(jpegBuf);
if (jpegFile) fclose(jpegFile);
return retval;
}