mirror of
https://github.com/webmproject/libwebp.git
synced 2024-11-20 04:18:26 +01:00
134 lines
3.4 KiB
C
134 lines
3.4 KiB
C
// Copyright 2010 Google Inc.
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//
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// This code is licensed under the same terms as WebM:
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// Software License Agreement: http://www.webmproject.org/license/software/
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// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
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// -----------------------------------------------------------------------------
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//
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// simple command-line example calling libwebpdecode to
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// decode a WebP image into a PPM image.
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//
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// Compile with: gcc -o dwebp dwebp.c -lwebpdecode
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//
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// Author: Skal (pascal.massimino@gmail.com)
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#include <assert.h>
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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 "webp/decode.h"
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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//-----------------------------------------------------------------------------
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static void help(const char *s) {
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printf("Usage: dwebp "
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"[options] [in_file] [-h] [-yuv] [-o ppm_file]\n");
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}
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int main(int argc, char *argv[]) {
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const char *in_file = NULL;
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const char *out_file = NULL;
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int yuv_out = 0;
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int width, height, stride, uv_stride;
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uint8_t* out = NULL, *u = NULL, *v = NULL;
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int c;
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for (c = 1; c < argc; ++c) {
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if (!strcmp(argv[c], "-h")) {
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help(argv[0]);
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return 0;
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} else if (!strcmp(argv[c], "-o") && c < argc - 1) {
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out_file = argv[++c];
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} else if (!strcmp(argv[c], "-yuv")) {
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yuv_out = 1;
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} else if (argv[c][0] == '-') {
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printf("Unknown option '%s'\n", argv[c]);
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help(argv[0]);
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return -1;
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} else {
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in_file = argv[c];
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}
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}
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if (in_file == NULL) {
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printf("missing input file!!\n");
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help(argv[0]);
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return -1;
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}
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{
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uint32_t data_size = 0;
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void* data = NULL;
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FILE* const in = fopen(in_file, "rb");
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if (!in) {
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printf("cannot open input file '%s'\n", in_file);
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return 1;
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}
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fseek(in, 0, SEEK_END);
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data_size = ftell(in);
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fseek(in, 0, SEEK_SET);
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data = malloc(data_size);
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const int ok = (fread(data, data_size, 1, in) == 1);
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fclose(in);
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if (!ok) {
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free(data);
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return -1;
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}
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if (!yuv_out) {
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out = WebPDecodeRGB(data, data_size, &width, &height);
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} else {
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out = WebPDecodeYUV(data, data_size, &width, &height,
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&u, &v, &stride, &uv_stride);
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}
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free(data);
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}
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if (!out) {
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printf("Decoding of %s failed.\n", in_file);
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return -1;
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}
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if (out_file) {
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FILE* const fout = fopen(out_file, "wb");
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if (fout) {
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if (!yuv_out) {
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fprintf(fout, "P6\n%d %d\n255\n", width, height);
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fwrite(out, width * height, 3, fout);
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} else {
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int y;
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fprintf(fout, "P5\n%d %d\n255\n", width, height * 3 / 2);
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for (y = 0; y < height; ++y) {
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fwrite(out + y * stride, width, 1, fout);
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}
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for (y = 0; y < (height + 1) / 2; ++y) {
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fwrite(u + y * uv_stride, (width + 1) / 2, 1, fout);
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}
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for (y = 0; y < (height + 1) / 2; ++y) {
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fwrite(v + y * uv_stride, (width + 1) / 2, 1, fout);
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}
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}
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fclose(fout);
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printf("Saved file %s\n", out_file);
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} else {
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printf("Error opening output file %s\n", out_file);
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}
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}
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printf("Decoded %s. Dimensions: %d x %d.\n", in_file, width, height);
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free(out);
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return 0;
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}
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//-----------------------------------------------------------------------------
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#if defined(__cplusplus) || defined(c_plusplus)
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} // extern "C"
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#endif
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