blob: 3f6ba2029103e7ca4a850f890185fe958c0bd230 [file] [log] [blame]
// Simple tool to roughly evaluate the quality encoding of a webp bitstream
//
// Result is a *rough* estimation of the quality. You should just consider
// the bucket it's in (q > 80? > 50? > 20?) and not take it for face value.
/*
gcc -o webp_quality webp_quality.c -O3 -I../ -L. -L../imageio \
-limageio_util -lwebpextras -lwebp -lm -lpthread
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "extras/extras.h"
#include "imageio/imageio_util.h"
int main(int argc, const char *argv[]) {
int c;
int quiet = 0;
int ok = 1;
for (c = 1; ok && c < argc; ++c) {
if (!strcmp(argv[c], "-quiet")) {
quiet = 1;
} else if (!strcmp(argv[c], "-help") || !strcmp(argv[c], "-h")) {
printf("webp_quality [-h][-quiet] webp_files...\n");
return 0;
} else {
const char* const filename = argv[c];
const uint8_t* data = NULL;
size_t data_size = 0;
int q;
ok = ImgIoUtilReadFile(filename, &data, &data_size);
if (!ok) break;
q = VP8EstimateQuality(data, data_size);
if (!quiet) printf("[%s] ", filename);
if (q < 0) {
fprintf(stderr, "Not a WebP file, or not a lossy WebP file.\n");
ok = 0;
} else {
if (!quiet) {
printf("Estimated quality factor: %d\n", q);
} else {
printf("%d\n", q); // just print the number
}
}
free((void*)data);
}
}
return ok ? 0 : 1;
}