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libwebp/examples/dwebp.c

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// Copyright 2010 Google Inc. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the COPYING file in the root of the source
// tree. An additional intellectual property rights grant can be found
// in the file PATENTS. All contributing project authors may
// be found in the AUTHORS file in the root of the source tree.
// -----------------------------------------------------------------------------
//
// Command-line tool for decoding a WebP image.
//
// Author: Skal (pascal.massimino@gmail.com)
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_CONFIG_H
#include "webp/config.h"
#endif
#include "../examples/example_util.h"
#include "../imageio/image_enc.h"
#include "../imageio/webpdec.h"
#include "./stopwatch.h"
static int verbose = 0;
static int quiet = 0;
#ifndef WEBP_DLL
#ifdef __cplusplus
extern "C" {
#endif
extern void* VP8GetCPUInfo; // opaque forward declaration.
#ifdef __cplusplus
} // extern "C"
#endif
#endif // WEBP_DLL
static int SaveOutput(const WebPDecBuffer* const buffer,
WebPOutputFileFormat format, const char* const out_file) {
const int use_stdout = (out_file != NULL) && !strcmp(out_file, "-");
int ok = 1;
Stopwatch stop_watch;
if (verbose) {
StopwatchReset(&stop_watch);
}
ok = WebPSaveImage(buffer, format, out_file);
if (ok) {
if (!quiet) {
if (use_stdout) {
fprintf(stderr, "Saved to stdout\n");
} else {
fprintf(stderr, "Saved file %s\n", out_file);
}
}
if (verbose) {
const double write_time = StopwatchReadAndReset(&stop_watch);
fprintf(stderr, "Time to write output: %.3fs\n", write_time);
}
} else {
if (use_stdout) {
fprintf(stderr, "Error writing to stdout !!\n");
} else {
fprintf(stderr, "Error writing file %s !!\n", out_file);
}
}
return ok;
}
static void Help(void) {
printf("Usage: dwebp in_file [options] [-o out_file]\n\n"
"Decodes the WebP image file to PNG format [Default]\n"
"Use following options to convert into alternate image formats:\n"
" -pam ......... save the raw RGBA samples as a color PAM\n"
" -ppm ......... save the raw RGB samples as a color PPM\n"
" -bmp ......... save as uncompressed BMP format\n"
" -tiff ........ save as uncompressed TIFF format\n"
" -pgm ......... save the raw YUV samples as a grayscale PGM\n"
" file with IMC4 layout\n"
" -yuv ......... save the raw YUV samples in flat layout\n"
"\n"
" Other options are:\n"
" -version ..... print version number and exit\n"
" -nofancy ..... don't use the fancy YUV420 upscaler\n"
" -nofilter .... disable in-loop filtering\n"
" -nodither .... disable dithering\n"
" -dither <d> .. dithering strength (in 0..100)\n"
" -alpha_dither use alpha-plane dithering if needed\n"
" -mt .......... use multi-threading\n"
" -crop <x> <y> <w> <h> ... crop output with the given rectangle\n"
" -resize <w> <h> ......... scale the output (*after* any cropping)\n"
" -flip ........ flip the output vertically\n"
" -alpha ....... only save the alpha plane\n"
" -incremental . use incremental decoding (useful for tests)\n"
" -h ........... this help message\n"
" -v ........... verbose (e.g. print encoding/decoding times)\n"
" -quiet ....... quiet mode, don't print anything\n"
#ifndef WEBP_DLL
" -noasm ....... disable all assembly optimizations\n"
#endif
);
}
static const char* const kFormatType[] = {
"unspecified", "lossy", "lossless"
};
static uint8_t* AllocateExternalBuffer(WebPDecoderConfig* config,
WebPOutputFileFormat format,
int use_external_memory) {
uint8_t* external_buffer = NULL;
WebPDecBuffer* const output_buffer = &config->output;
int w = config->input.width;
int h = config->input.height;
if (config->options.use_scaling) {
w = config->options.scaled_width;
h = config->options.scaled_height;
} else if (config->options.use_cropping) {
w = config->options.crop_width;
h = config->options.crop_height;
}
if (format >= RGB && format <= rgbA_4444) {
const int bpp = (format == RGB || format == BGR) ? 3
: (format == RGBA_4444 || format == rgbA_4444 ||
format == RGB_565) ? 2
: 4;
uint32_t stride = bpp * w + 7; // <- just for exercising
external_buffer = (uint8_t*)malloc(stride * h);
if (external_buffer == NULL) return NULL;
output_buffer->u.RGBA.stride = stride;
output_buffer->u.RGBA.size = stride * h;
output_buffer->u.RGBA.rgba = external_buffer;
} else { // YUV and YUVA
const int has_alpha = WebPIsAlphaMode(output_buffer->colorspace);
uint8_t* tmp;
uint32_t stride = w + 3;
uint32_t uv_stride = (w + 1) / 2 + 13;
uint32_t total_size = stride * h * (has_alpha ? 2 : 1)
+ 2 * uv_stride * (h + 1) / 2;
assert(format >= YUV && format <= YUVA);
external_buffer = (uint8_t*)malloc(total_size);
if (external_buffer == NULL) return NULL;
tmp = external_buffer;
output_buffer->u.YUVA.y = tmp;
output_buffer->u.YUVA.y_stride = stride;
output_buffer->u.YUVA.y_size = stride * h;
tmp += output_buffer->u.YUVA.y_size;
if (has_alpha) {
output_buffer->u.YUVA.a = tmp;
output_buffer->u.YUVA.a_stride = stride;
output_buffer->u.YUVA.a_size = stride * h;
tmp += output_buffer->u.YUVA.a_size;
} else {
output_buffer->u.YUVA.a = NULL;
output_buffer->u.YUVA.a_stride = 0;
}
output_buffer->u.YUVA.u = tmp;
output_buffer->u.YUVA.u_stride = uv_stride;
output_buffer->u.YUVA.u_size = uv_stride * (h + 1) / 2;
tmp += output_buffer->u.YUVA.u_size;
output_buffer->u.YUVA.v = tmp;
output_buffer->u.YUVA.v_stride = uv_stride;
output_buffer->u.YUVA.v_size = uv_stride * (h + 1) / 2;
tmp += output_buffer->u.YUVA.v_size;
assert(tmp <= external_buffer + total_size);
}
output_buffer->is_external_memory = use_external_memory;
return external_buffer;
}
int main(int argc, const char *argv[]) {
int ok = 0;
const char *in_file = NULL;
const char *out_file = NULL;
WebPDecoderConfig config;
WebPDecBuffer* const output_buffer = &config.output;
WebPBitstreamFeatures* const bitstream = &config.input;
WebPOutputFileFormat format = PNG;
uint8_t* external_buffer = NULL;
int use_external_memory = 0;
const uint8_t* data = NULL;
int incremental = 0;
int c;
if (!WebPInitDecoderConfig(&config)) {
fprintf(stderr, "Library version mismatch!\n");
return -1;
}
for (c = 1; c < argc; ++c) {
int parse_error = 0;
if (!strcmp(argv[c], "-h") || !strcmp(argv[c], "-help")) {
Help();
return 0;
} else if (!strcmp(argv[c], "-o") && c < argc - 1) {
out_file = argv[++c];
} else if (!strcmp(argv[c], "-alpha")) {
format = ALPHA_PLANE_ONLY;
} else if (!strcmp(argv[c], "-nofancy")) {
config.options.no_fancy_upsampling = 1;
} else if (!strcmp(argv[c], "-nofilter")) {
config.options.bypass_filtering = 1;
} else if (!strcmp(argv[c], "-pam")) {
format = PAM;
} else if (!strcmp(argv[c], "-ppm")) {
format = PPM;
} else if (!strcmp(argv[c], "-bmp")) {
format = BMP;
} else if (!strcmp(argv[c], "-tiff")) {
format = TIFF;
} else if (!strcmp(argv[c], "-quiet")) {
quiet = 1;
} else if (!strcmp(argv[c], "-version")) {
const int version = WebPGetDecoderVersion();
printf("%d.%d.%d\n",
(version >> 16) & 0xff, (version >> 8) & 0xff, version & 0xff);
return 0;
} else if (!strcmp(argv[c], "-pgm")) {
format = PGM;
} else if (!strcmp(argv[c], "-yuv")) {
format = RAW_YUV;
} else if (!strcmp(argv[c], "-pixel_format") && c < argc - 1) {
const char* const fmt = argv[++c];
if (!strcmp(fmt, "RGB")) format = RGB;
else if (!strcmp(fmt, "RGBA")) format = RGBA;
else if (!strcmp(fmt, "BGR")) format = BGR;
else if (!strcmp(fmt, "BGRA")) format = BGRA;
else if (!strcmp(fmt, "ARGB")) format = ARGB;
else if (!strcmp(fmt, "RGBA_4444")) format = RGBA_4444;
else if (!strcmp(fmt, "RGB_565")) format = RGB_565;
else if (!strcmp(fmt, "rgbA")) format = rgbA;
else if (!strcmp(fmt, "bgrA")) format = bgrA;
else if (!strcmp(fmt, "Argb")) format = Argb;
else if (!strcmp(fmt, "rgbA_4444")) format = rgbA_4444;
else if (!strcmp(fmt, "YUV")) format = YUV;
else if (!strcmp(fmt, "YUVA")) format = YUVA;
else {
fprintf(stderr, "Can't parse pixel_format %s\n", fmt);
parse_error = 1;
}
} else if (!strcmp(argv[c], "-external_memory") && c < argc - 1) {
use_external_memory = ExUtilGetInt(argv[++c], 0, &parse_error);
parse_error |= (use_external_memory > 2 || use_external_memory < 0);
if (parse_error) {
fprintf(stderr, "Can't parse 'external_memory' value %s\n", argv[c]);
}
} else if (!strcmp(argv[c], "-mt")) {
config.options.use_threads = 1;
} else if (!strcmp(argv[c], "-alpha_dither")) {
config.options.alpha_dithering_strength = 100;
} else if (!strcmp(argv[c], "-nodither")) {
config.options.dithering_strength = 0;
} else if (!strcmp(argv[c], "-dither") && c < argc - 1) {
config.options.dithering_strength =
ExUtilGetInt(argv[++c], 0, &parse_error);
} else if (!strcmp(argv[c], "-crop") && c < argc - 4) {
config.options.use_cropping = 1;
config.options.crop_left = ExUtilGetInt(argv[++c], 0, &parse_error);
config.options.crop_top = ExUtilGetInt(argv[++c], 0, &parse_error);
config.options.crop_width = ExUtilGetInt(argv[++c], 0, &parse_error);
config.options.crop_height = ExUtilGetInt(argv[++c], 0, &parse_error);
} else if ((!strcmp(argv[c], "-scale") || !strcmp(argv[c], "-resize")) &&
c < argc - 2) { // '-scale' is left for compatibility
config.options.use_scaling = 1;
config.options.scaled_width = ExUtilGetInt(argv[++c], 0, &parse_error);
config.options.scaled_height = ExUtilGetInt(argv[++c], 0, &parse_error);
} else if (!strcmp(argv[c], "-flip")) {
config.options.flip = 1;
} else if (!strcmp(argv[c], "-v")) {
verbose = 1;
#ifndef WEBP_DLL
} else if (!strcmp(argv[c], "-noasm")) {
VP8GetCPUInfo = NULL;
#endif
} else if (!strcmp(argv[c], "-incremental")) {
incremental = 1;
} else if (!strcmp(argv[c], "--")) {
if (c < argc - 1) in_file = argv[++c];
break;
} else if (argv[c][0] == '-') {
fprintf(stderr, "Unknown option '%s'\n", argv[c]);
Help();
return -1;
} else {
in_file = argv[c];
}
if (parse_error) {
Help();
return -1;
}
}
if (in_file == NULL) {
fprintf(stderr, "missing input file!!\n");
Help();
return -1;
}
if (quiet) verbose = 0;
{
VP8StatusCode status = VP8_STATUS_OK;
size_t data_size = 0;
if (!LoadWebP(in_file, &data, &data_size, bitstream)) {
return -1;
}
switch (format) {
case PNG:
#ifdef HAVE_WINCODEC_H
output_buffer->colorspace = bitstream->has_alpha ? MODE_BGRA : MODE_BGR;
#else
output_buffer->colorspace = bitstream->has_alpha ? MODE_RGBA : MODE_RGB;
#endif
break;
case PAM:
output_buffer->colorspace = MODE_RGBA;
break;
case PPM:
output_buffer->colorspace = MODE_RGB; // drops alpha for PPM
break;
case BMP:
output_buffer->colorspace = bitstream->has_alpha ? MODE_BGRA : MODE_BGR;
break;
case TIFF:
output_buffer->colorspace = bitstream->has_alpha ? MODE_RGBA : MODE_RGB;
break;
case PGM:
case RAW_YUV:
output_buffer->colorspace = bitstream->has_alpha ? MODE_YUVA : MODE_YUV;
break;
case ALPHA_PLANE_ONLY:
output_buffer->colorspace = MODE_YUVA;
break;
// forced modes:
case RGB: output_buffer->colorspace = MODE_RGB; break;
case RGBA: output_buffer->colorspace = MODE_RGBA; break;
case BGR: output_buffer->colorspace = MODE_BGR; break;
case BGRA: output_buffer->colorspace = MODE_BGRA; break;
case ARGB: output_buffer->colorspace = MODE_ARGB; break;
case RGBA_4444: output_buffer->colorspace = MODE_RGBA_4444; break;
case RGB_565: output_buffer->colorspace = MODE_RGB_565; break;
case rgbA: output_buffer->colorspace = MODE_rgbA; break;
case bgrA: output_buffer->colorspace = MODE_bgrA; break;
case Argb: output_buffer->colorspace = MODE_Argb; break;
case rgbA_4444: output_buffer->colorspace = MODE_rgbA_4444; break;
case YUV: output_buffer->colorspace = MODE_YUV; break;
case YUVA: output_buffer->colorspace = MODE_YUVA; break;
default: goto Exit;
}
if (use_external_memory > 0 && format >= RGB) {
external_buffer = AllocateExternalBuffer(&config, format,
use_external_memory);
if (external_buffer == NULL) goto Exit;
}
{
Stopwatch stop_watch;
if (verbose) StopwatchReset(&stop_watch);
if (incremental) {
status = DecodeWebPIncremental(data, data_size, &config);
} else {
status = DecodeWebP(data, data_size, &config);
}
if (verbose) {
const double decode_time = StopwatchReadAndReset(&stop_watch);
fprintf(stderr, "Time to decode picture: %.3fs\n", decode_time);
}
}
ok = (status == VP8_STATUS_OK);
if (!ok) {
PrintWebPError(in_file, status);
goto Exit;
}
}
if (out_file != NULL) {
if (!quiet) {
fprintf(stderr, "Decoded %s. Dimensions: %d x %d %s. Format: %s. "
"Now saving...\n",
in_file, output_buffer->width, output_buffer->height,
bitstream->has_alpha ? " (with alpha)" : "",
kFormatType[bitstream->format]);
}
ok = SaveOutput(output_buffer, format, out_file);
} else {
if (!quiet) {
fprintf(stderr, "File %s can be decoded "
"(dimensions: %d x %d %s. Format: %s).\n",
in_file, output_buffer->width, output_buffer->height,
bitstream->has_alpha ? " (with alpha)" : "",
kFormatType[bitstream->format]);
fprintf(stderr, "Nothing written; "
"use -o flag to save the result as e.g. PNG.\n");
}
}
Exit:
WebPFreeDecBuffer(output_buffer);
free((void*)external_buffer);
free((void*)data);
return ok ? 0 : -1;
}
//------------------------------------------------------------------------------
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