Green Sky
67653bbe50
git-subtree-dir: external/libwebp/libwebp git-subtree-split: dd7364c3cefe0f5c0b3c18c3b1887d353f90fc1f
55 lines
1.5 KiB
C
55 lines
1.5 KiB
C
// Simple tool to roughly evaluate the quality encoding of a webp bitstream
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//
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// Result is a *rough* estimation of the quality. You should just consider
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// the bucket it's in (q > 80? > 50? > 20?) and not take it for face value.
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/*
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gcc -o webp_quality webp_quality.c -O3 -I../ -L. -L../imageio \
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-limageio_util -lwebpextras -lwebp -lm -lpthread
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "extras/extras.h"
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#include "imageio/imageio_util.h"
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#include "../examples/unicode.h"
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int main(int argc, const char* argv[]) {
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int c;
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int quiet = 0;
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int ok = 1;
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INIT_WARGV(argc, argv);
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for (c = 1; ok && c < argc; ++c) {
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if (!strcmp(argv[c], "-quiet")) {
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quiet = 1;
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} else if (!strcmp(argv[c], "-help") || !strcmp(argv[c], "-h")) {
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printf("webp_quality [-h][-quiet] webp_files...\n");
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FREE_WARGV_AND_RETURN(0);
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} else {
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const char* const filename = (const char*)GET_WARGV(argv, c);
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const uint8_t* data = NULL;
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size_t data_size = 0;
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int q;
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ok = ImgIoUtilReadFile(filename, &data, &data_size);
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if (!ok) break;
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q = VP8EstimateQuality(data, data_size);
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if (!quiet) WPRINTF("[%s] ", (const W_CHAR*)filename);
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if (q < 0) {
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fprintf(stderr, "Not a WebP file, or not a lossy WebP file.\n");
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ok = 0;
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} else {
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if (!quiet) {
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printf("Estimated quality factor: %d\n", q);
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} else {
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printf("%d\n", q); // just print the number
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}
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}
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free((void*)data);
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}
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}
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FREE_WARGV_AND_RETURN(ok ? 0 : 1);
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}
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