1 // Simple tool to roughly evaluate the quality encoding of a webp bitstream
2 //
3 // Result is a *rough* estimation of the quality. You should just consider
4 // the bucket it's in (q > 80? > 50? > 20?) and not take it for face value.
5 /*
6 gcc -o webp_quality webp_quality.c -O3 -I../ -L. -L../imageio \
7 -limageio_util -lwebpextras -lwebp -lm -lpthread
8 */
9
10 #include <stdio.h>
11 #include <stdlib.h>
12 #include <string.h>
13
14 #include "extras/extras.h"
15 #include "imageio/imageio_util.h"
16 #include "../examples/unicode.h"
17
main(int argc,const char * argv[])18 int main(int argc, const char* argv[]) {
19 int c;
20 int quiet = 0;
21 int ok = 1;
22
23 INIT_WARGV(argc, argv);
24
25 for (c = 1; ok && c < argc; ++c) {
26 if (!strcmp(argv[c], "-quiet")) {
27 quiet = 1;
28 } else if (!strcmp(argv[c], "-help") || !strcmp(argv[c], "-h")) {
29 printf("webp_quality [-h][-quiet] webp_files...\n");
30 FREE_WARGV_AND_RETURN(0);
31 } else {
32 const char* const filename = (const char*)GET_WARGV(argv, c);
33 const uint8_t* data = NULL;
34 size_t data_size = 0;
35 int q;
36 ok = ImgIoUtilReadFile(filename, &data, &data_size);
37 if (!ok) break;
38 q = VP8EstimateQuality(data, data_size);
39 if (!quiet) WPRINTF("[%s] ", (const W_CHAR*)filename);
40 if (q < 0) {
41 fprintf(stderr, "Not a WebP file, or not a lossy WebP file.\n");
42 ok = 0;
43 } else {
44 if (!quiet) {
45 printf("Estimated quality factor: %d\n", q);
46 } else {
47 printf("%d\n", q); // just print the number
48 }
49 }
50 free((void*)data);
51 }
52 }
53 FREE_WARGV_AND_RETURN(ok ? 0 : 1);
54 }
55