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1.5.0
libwebp/examples/gif2webp.c
James Zern da0d9c7d4e examples: exit w/failure w/no args 
cwebp, gif2webp, img2webp, vwebp and webpinfo are modified in this
change to align with the other examples. When given no arguments, the
examples print their help output and exit with failure.

Bug: webp:42340557, webp:381372617
Change-Id: Ifed4eb79e98233f7aa780c42e489636d0cf4a035
2024-12-06 14:53:06 -08:00

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// Copyright 2012 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.
// -----------------------------------------------------------------------------
//
// simple tool to convert animated GIFs to WebP
//
// Authors: Skal (pascal.massimino@gmail.com)
// Urvang (urvang@google.com)
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_CONFIG_H
#include "webp/config.h"
#endif
#ifdef WEBP_HAVE_GIF
#if defined(HAVE_UNISTD_H) && HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <gif_lib.h>
#include "sharpyuv/sharpyuv.h"
#include "webp/encode.h"
#include "webp/mux.h"
#include "../examples/example_util.h"
#include "../imageio/imageio_util.h"
#include "./gifdec.h"
#include "./unicode.h"
#include "./unicode_gif.h"
#if !defined(STDIN_FILENO)
#define STDIN_FILENO 0
#endif
//------------------------------------------------------------------------------
static int transparent_index = GIF_INDEX_INVALID; // Opaque by default.
static const char* const kErrorMessages[-WEBP_MUX_NOT_ENOUGH_DATA + 1] = {
"WEBP_MUX_NOT_FOUND", "WEBP_MUX_INVALID_ARGUMENT", "WEBP_MUX_BAD_DATA",
"WEBP_MUX_MEMORY_ERROR", "WEBP_MUX_NOT_ENOUGH_DATA"
};
static const char* ErrorString(WebPMuxError err) {
assert(err <= WEBP_MUX_NOT_FOUND && err >= WEBP_MUX_NOT_ENOUGH_DATA);
return kErrorMessages[-err];
}
enum {
METADATA_ICC = (1 << 0),
METADATA_XMP = (1 << 1),
METADATA_ALL = METADATA_ICC | METADATA_XMP
};
//------------------------------------------------------------------------------
static void Help(void) {
printf("Usage:\n");
printf(" gif2webp [options] gif_file -o webp_file\n");
printf("Options:\n");
printf(" -h / -help ............. this help\n");
printf(" -lossy ................. encode image using lossy compression\n");
printf(" -mixed ................. for each frame in the image, pick lossy\n"
" or lossless compression heuristically\n");
printf(" -near_lossless <int> ... use near-lossless image preprocessing\n"
" (0..100=off), default=100\n");
printf(" -sharp_yuv ............. use sharper (and slower) RGB->YUV "
"conversion\n"
" (lossy only)\n");
printf(" -q <float> ............. quality factor (0:small..100:big)\n");
printf(" -m <int> ............... compression method (0=fast, 6=slowest), "
"default=4\n");
printf(" -min_size .............. minimize output size (default:off)\n"
" lossless compression by default; can be\n"
" combined with -q, -m, -lossy or -mixed\n"
" options\n");
printf(" -kmin <int> ............ min distance between key frames\n");
printf(" -kmax <int> ............ max distance between key frames\n");
printf(" -f <int> ............... filter strength (0=off..100)\n");
printf(" -metadata <string> ..... comma separated list of metadata to\n");
printf(" ");
printf("copy from the input to the output if present\n");
printf(" ");
printf("Valid values: all, none, icc, xmp (default)\n");
printf(" -loop_compatibility .... use compatibility mode for Chrome\n");
printf(" version prior to M62 (inclusive)\n");
printf(" -mt .................... use multi-threading if available\n");
printf("\n");
printf(" -version ............... print version number and exit\n");
printf(" -v ..................... verbose\n");
printf(" -quiet ................. don't print anything\n");
printf("\n");
}
//------------------------------------------------------------------------------
// Returns EXIT_SUCCESS on success, EXIT_FAILURE on failure.
int main(int argc, const char* argv[]) {
int verbose = 0;
int gif_error = GIF_ERROR;
WebPMuxError err = WEBP_MUX_OK;
int ok = 0;
const W_CHAR* in_file = NULL, *out_file = NULL;
GifFileType* gif = NULL;
int frame_duration = 0;
int frame_timestamp = 0;
GIFDisposeMethod orig_dispose = GIF_DISPOSE_NONE;
WebPPicture frame; // Frame rectangle only (not disposed).
WebPPicture curr_canvas; // Not disposed.
WebPPicture prev_canvas; // Disposed.
WebPAnimEncoder* enc = NULL;
WebPAnimEncoderOptions enc_options;
WebPConfig config;
int frame_number = 0; // Whether we are processing the first frame.
int done;
int c;
int quiet = 0;
WebPData webp_data;
int keep_metadata = METADATA_XMP; // ICC not output by default.
WebPData icc_data;
int stored_icc = 0; // Whether we have already stored an ICC profile.
WebPData xmp_data;
int stored_xmp = 0; // Whether we have already stored an XMP profile.
int loop_count = 0; // default: infinite
int stored_loop_count = 0; // Whether we have found an explicit loop count.
int loop_compatibility = 0;
WebPMux* mux = NULL;
int default_kmin = 1; // Whether to use default kmin value.
int default_kmax = 1;
INIT_WARGV(argc, argv);
if (!WebPConfigInit(&config) || !WebPAnimEncoderOptionsInit(&enc_options) ||
!WebPPictureInit(&frame) || !WebPPictureInit(&curr_canvas) ||
!WebPPictureInit(&prev_canvas)) {
fprintf(stderr, "Error! Version mismatch!\n");
FREE_WARGV_AND_RETURN(EXIT_FAILURE);
}
config.lossless = 1; // Use lossless compression by default.
WebPDataInit(&webp_data);
WebPDataInit(&icc_data);
WebPDataInit(&xmp_data);
if (argc == 1) {
Help();
FREE_WARGV_AND_RETURN(EXIT_FAILURE);
}
for (c = 1; c < argc; ++c) {
int parse_error = 0;
if (!strcmp(argv[c], "-h") || !strcmp(argv[c], "-help")) {
Help();
FREE_WARGV_AND_RETURN(EXIT_SUCCESS);
} else if (!strcmp(argv[c], "-o") && c < argc - 1) {
out_file = GET_WARGV(argv, ++c);
} else if (!strcmp(argv[c], "-lossy")) {
config.lossless = 0;
} else if (!strcmp(argv[c], "-mixed")) {
enc_options.allow_mixed = 1;
config.lossless = 0;
} else if (!strcmp(argv[c], "-near_lossless") && c < argc - 1) {
config.near_lossless = ExUtilGetInt(argv[++c], 0, &parse_error);
} else if (!strcmp(argv[c], "-sharp_yuv")) {
config.use_sharp_yuv = 1;
} else if (!strcmp(argv[c], "-loop_compatibility")) {
loop_compatibility = 1;
} else if (!strcmp(argv[c], "-q") && c < argc - 1) {
config.quality = ExUtilGetFloat(argv[++c], &parse_error);
} else if (!strcmp(argv[c], "-m") && c < argc - 1) {
config.method = ExUtilGetInt(argv[++c], 0, &parse_error);
} else if (!strcmp(argv[c], "-min_size")) {
enc_options.minimize_size = 1;
} else if (!strcmp(argv[c], "-kmax") && c < argc - 1) {
enc_options.kmax = ExUtilGetInt(argv[++c], 0, &parse_error);
default_kmax = 0;
} else if (!strcmp(argv[c], "-kmin") && c < argc - 1) {
enc_options.kmin = ExUtilGetInt(argv[++c], 0, &parse_error);
default_kmin = 0;
} else if (!strcmp(argv[c], "-f") && c < argc - 1) {
config.filter_strength = ExUtilGetInt(argv[++c], 0, &parse_error);
} else if (!strcmp(argv[c], "-metadata") && c < argc - 1) {
static const struct {
const char* option;
int flag;
} kTokens[] = {
{ "all", METADATA_ALL },
{ "none", 0 },
{ "icc", METADATA_ICC },
{ "xmp", METADATA_XMP },
};
const size_t kNumTokens = sizeof(kTokens) / sizeof(*kTokens);
const char* start = argv[++c];
const char* const end = start + strlen(start);
keep_metadata = 0;
while (start < end) {
size_t i;
const char* token = strchr(start, ',');
if (token == NULL) token = end;
for (i = 0; i < kNumTokens; ++i) {
if ((size_t)(token - start) == strlen(kTokens[i].option) &&
!strncmp(start, kTokens[i].option, strlen(kTokens[i].option))) {
if (kTokens[i].flag != 0) {
keep_metadata |= kTokens[i].flag;
} else {
keep_metadata = 0;
}
break;
}
}
if (i == kNumTokens) {
fprintf(stderr, "Error! Unknown metadata type '%.*s'\n",
(int)(token - start), start);
Help();
FREE_WARGV_AND_RETURN(EXIT_FAILURE);
}
start = token + 1;
}
} else if (!strcmp(argv[c], "-mt")) {
++config.thread_level;
} else if (!strcmp(argv[c], "-version")) {
const int enc_version = WebPGetEncoderVersion();
const int mux_version = WebPGetMuxVersion();
const int sharpyuv_version = SharpYuvGetVersion();
printf("WebP Encoder version: %d.%d.%d\nWebP Mux version: %d.%d.%d\n",
(enc_version >> 16) & 0xff, (enc_version >> 8) & 0xff,
enc_version & 0xff, (mux_version >> 16) & 0xff,
(mux_version >> 8) & 0xff, mux_version & 0xff);
printf("libsharpyuv: %d.%d.%d\n", (sharpyuv_version >> 24) & 0xff,
(sharpyuv_version >> 16) & 0xffff, sharpyuv_version & 0xff);
FREE_WARGV_AND_RETURN(EXIT_SUCCESS);
} else if (!strcmp(argv[c], "-quiet")) {
quiet = 1;
enc_options.verbose = 0;
} else if (!strcmp(argv[c], "-v")) {
verbose = 1;
enc_options.verbose = 1;
} else if (!strcmp(argv[c], "--")) {
if (c < argc - 1) in_file = GET_WARGV(argv, ++c);
break;
} else if (argv[c][0] == '-') {
fprintf(stderr, "Error! Unknown option '%s'\n", argv[c]);
Help();
FREE_WARGV_AND_RETURN(EXIT_FAILURE);
} else {
in_file = GET_WARGV(argv, c);
}
if (parse_error) {
Help();
FREE_WARGV_AND_RETURN(EXIT_FAILURE);
}
}
// Appropriate default kmin, kmax values for lossy and lossless.
if (default_kmin) {
enc_options.kmin = config.lossless ? 9 : 3;
}
if (default_kmax) {
enc_options.kmax = config.lossless ? 17 : 5;
}
if (!WebPValidateConfig(&config)) {
fprintf(stderr, "Error! Invalid configuration.\n");
goto End;
}
if (in_file == NULL) {
fprintf(stderr, "No input file specified!\n");
Help();
goto End;
}
// Start the decoder object
gif = DGifOpenFileUnicode(in_file, &gif_error);
if (gif == NULL) goto End;
// Loop over GIF images
done = 0;
do {
GifRecordType type;
if (DGifGetRecordType(gif, &type) == GIF_ERROR) goto End;
switch (type) {
case IMAGE_DESC_RECORD_TYPE: {
GIFFrameRect gif_rect;
GifImageDesc* const image_desc = &gif->Image;
if (!DGifGetImageDesc(gif)) goto End;
if (frame_number == 0) {
if (verbose) {
printf("Canvas screen: %d x %d\n", gif->SWidth, gif->SHeight);
}
// Fix some broken GIF global headers that report
// 0 x 0 screen dimension.
if (gif->SWidth == 0 || gif->SHeight == 0) {
image_desc->Left = 0;
image_desc->Top = 0;
gif->SWidth = image_desc->Width;
gif->SHeight = image_desc->Height;
if (gif->SWidth <= 0 || gif->SHeight <= 0) {
goto End;
}
if (verbose) {
printf("Fixed canvas screen dimension to: %d x %d\n",
gif->SWidth, gif->SHeight);
}
}
// Allocate current buffer.
frame.width = gif->SWidth;
frame.height = gif->SHeight;
frame.use_argb = 1;
if (!WebPPictureAlloc(&frame)) goto End;
GIFClearPic(&frame, NULL);
if (!(WebPPictureCopy(&frame, &curr_canvas) &&
WebPPictureCopy(&frame, &prev_canvas))) {
fprintf(stderr, "Error allocating canvas.\n");
goto End;
}
// Background color.
GIFGetBackgroundColor(gif->SColorMap, gif->SBackGroundColor,
transparent_index,
&enc_options.anim_params.bgcolor);
// Initialize encoder.
enc = WebPAnimEncoderNew(curr_canvas.width, curr_canvas.height,
&enc_options);
if (enc == NULL) {
fprintf(stderr,
"Error! Could not create encoder object. Possibly due to "
"a memory error.\n");
goto End;
}
}
// Some even more broken GIF can have sub-rect with zero width/height.
if (image_desc->Width == 0 || image_desc->Height == 0) {
image_desc->Width = gif->SWidth;
image_desc->Height = gif->SHeight;
}
if (!GIFReadFrame(gif, transparent_index, &gif_rect, &frame)) {
goto End;
}
// Blend frame rectangle with previous canvas to compose full canvas.
// Note that 'curr_canvas' is same as 'prev_canvas' at this point.
GIFBlendFrames(&frame, &gif_rect, &curr_canvas);
if (!WebPAnimEncoderAdd(enc, &curr_canvas, frame_timestamp, &config)) {
fprintf(stderr, "Error while adding frame #%d: %s\n", frame_number,
WebPAnimEncoderGetError(enc));
goto End;
} else {
++frame_number;
}
// Update canvases.
GIFDisposeFrame(orig_dispose, &gif_rect, &prev_canvas, &curr_canvas);
GIFCopyPixels(&curr_canvas, &prev_canvas);
// Force frames with a small or no duration to 100ms to be consistent
// with web browsers and other transcoding tools. This also avoids
// incorrect durations between frames when padding frames are
// discarded.
if (frame_duration <= 10) {
frame_duration = 100;
}
// Update timestamp (for next frame).
frame_timestamp += frame_duration;
// In GIF, graphic control extensions are optional for a frame, so we
// may not get one before reading the next frame. To handle this case,
// we reset frame properties to reasonable defaults for the next frame.
orig_dispose = GIF_DISPOSE_NONE;
frame_duration = 0;
transparent_index = GIF_INDEX_INVALID;
break;
}
case EXTENSION_RECORD_TYPE: {
int extension;
GifByteType* data = NULL;
if (DGifGetExtension(gif, &extension, &data) == GIF_ERROR) {
goto End;
}
if (data == NULL) continue;
switch (extension) {
case COMMENT_EXT_FUNC_CODE: {
break; // Do nothing for now.
}
case GRAPHICS_EXT_FUNC_CODE: {
if (!GIFReadGraphicsExtension(data, &frame_duration, &orig_dispose,
&transparent_index)) {
goto End;
}
break;
}
case PLAINTEXT_EXT_FUNC_CODE: {
break;
}
case APPLICATION_EXT_FUNC_CODE: {
if (data[0] != 11) break; // Chunk is too short
if (!memcmp(data + 1, "NETSCAPE2.0", 11) ||
!memcmp(data + 1, "ANIMEXTS1.0", 11)) {
if (!GIFReadLoopCount(gif, &data, &loop_count)) {
goto End;
}
if (verbose) {
fprintf(stderr, "Loop count: %d\n", loop_count);
}
stored_loop_count = loop_compatibility ? (loop_count != 0) : 1;
} else { // An extension containing metadata.
// We only store the first encountered chunk of each type, and
// only if requested by the user.
const int is_xmp = (keep_metadata & METADATA_XMP) &&
!stored_xmp &&
!memcmp(data + 1, "XMP DataXMP", 11);
const int is_icc = (keep_metadata & METADATA_ICC) &&
!stored_icc &&
!memcmp(data + 1, "ICCRGBG1012", 11);
if (is_xmp || is_icc) {
if (!GIFReadMetadata(gif, &data,
is_xmp ? &xmp_data : &icc_data)) {
goto End;
}
if (is_icc) {
stored_icc = 1;
} else if (is_xmp) {
stored_xmp = 1;
}
}
}
break;
}
default: {
break; // skip
}
}
while (data != NULL) {
if (DGifGetExtensionNext(gif, &data) == GIF_ERROR) goto End;
}
break;
}
case TERMINATE_RECORD_TYPE: {
done = 1;
break;
}
default: {
if (verbose) {
fprintf(stderr, "Skipping over unknown record type %d\n", type);
}
break;
}
}
} while (!done);
// Last NULL frame.
if (!WebPAnimEncoderAdd(enc, NULL, frame_timestamp, NULL)) {
fprintf(stderr, "Error flushing WebP muxer.\n");
fprintf(stderr, "%s\n", WebPAnimEncoderGetError(enc));
}
if (!WebPAnimEncoderAssemble(enc, &webp_data)) {
fprintf(stderr, "%s\n", WebPAnimEncoderGetError(enc));
goto End;
}
// If there's only one frame, we don't need to handle loop count.
if (frame_number == 1) {
loop_count = 0;
} else if (!loop_compatibility) {
if (!stored_loop_count) {
// if no loop-count element is seen, the default is '1' (loop-once)
// and we need to signal it explicitly in WebP. Note however that
// in case there's a single frame, we still don't need to store it.
if (frame_number > 1) {
stored_loop_count = 1;
loop_count = 1;
}
} else if (loop_count > 0 && loop_count < 65535) {
// adapt GIF's semantic to WebP's (except in the infinite-loop case)
loop_count += 1;
}
}
// loop_count of 0 is the default (infinite), so no need to signal it
if (loop_count == 0) stored_loop_count = 0;
if (stored_loop_count || stored_icc || stored_xmp) {
// Re-mux to add loop count and/or metadata as needed.
mux = WebPMuxCreate(&webp_data, 1);
if (mux == NULL) {
fprintf(stderr, "ERROR: Could not re-mux to add loop count/metadata.\n");
goto End;
}
WebPDataClear(&webp_data);
if (stored_loop_count) { // Update loop count.
WebPMuxAnimParams new_params;
err = WebPMuxGetAnimationParams(mux, &new_params);
if (err != WEBP_MUX_OK) {
fprintf(stderr, "ERROR (%s): Could not fetch loop count.\n",
ErrorString(err));
goto End;
}
new_params.loop_count = loop_count;
err = WebPMuxSetAnimationParams(mux, &new_params);
if (err != WEBP_MUX_OK) {
fprintf(stderr, "ERROR (%s): Could not update loop count.\n",
ErrorString(err));
goto End;
}
}
if (stored_icc) { // Add ICCP chunk.
err = WebPMuxSetChunk(mux, "ICCP", &icc_data, 1);
if (verbose) {
fprintf(stderr, "ICC size: %d\n", (int)icc_data.size);
}
if (err != WEBP_MUX_OK) {
fprintf(stderr, "ERROR (%s): Could not set ICC chunk.\n",
ErrorString(err));
goto End;
}
}
if (stored_xmp) { // Add XMP chunk.
err = WebPMuxSetChunk(mux, "XMP ", &xmp_data, 1);
if (verbose) {
fprintf(stderr, "XMP size: %d\n", (int)xmp_data.size);
}
if (err != WEBP_MUX_OK) {
fprintf(stderr, "ERROR (%s): Could not set XMP chunk.\n",
ErrorString(err));
goto End;
}
}
err = WebPMuxAssemble(mux, &webp_data);
if (err != WEBP_MUX_OK) {
fprintf(stderr, "ERROR (%s): Could not assemble when re-muxing to add "
"loop count/metadata.\n", ErrorString(err));
goto End;
}
}
if (out_file != NULL) {
if (!ImgIoUtilWriteFile((const char*)out_file, webp_data.bytes,
webp_data.size)) {
WFPRINTF(stderr, "Error writing output file: %s\n", out_file);
goto End;
}
if (!quiet) {
if (!WSTRCMP(out_file, "-")) {
fprintf(stderr, "Saved %d bytes to STDIO\n",
(int)webp_data.size);
} else {
WFPRINTF(stderr, "Saved output file (%d bytes): %s\n",
(int)webp_data.size, out_file);
}
}
} else {
if (!quiet) {
fprintf(stderr, "Nothing written; use -o flag to save the result "
"(%d bytes).\n", (int)webp_data.size);
}
}
// All OK.
ok = 1;
gif_error = GIF_OK;
End:
WebPDataClear(&icc_data);
WebPDataClear(&xmp_data);
WebPMuxDelete(mux);
WebPDataClear(&webp_data);
WebPPictureFree(&frame);
WebPPictureFree(&curr_canvas);
WebPPictureFree(&prev_canvas);
WebPAnimEncoderDelete(enc);
if (gif_error != GIF_OK) {
GIFDisplayError(gif, gif_error);
}
if (gif != NULL) {
#if LOCAL_GIF_PREREQ(5,1)
DGifCloseFile(gif, &gif_error);
#else
DGifCloseFile(gif);
#endif
}
FREE_WARGV_AND_RETURN(ok ? EXIT_SUCCESS : EXIT_FAILURE);
}
#else // !WEBP_HAVE_GIF
int main(int argc, const char* argv[]) {
fprintf(stderr, "GIF support not enabled in %s.\n", argv[0]);
(void)argc;
return EXIT_FAILURE;
}
#endif
//------------------------------------------------------------------------------
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