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73f52133a1
When '-mixed' option is given, each frame would be heuristically chosen to be encoded using lossy or lossless compression. The heuristic is based on the number of colors in the image: - If num_colors <= 31, pick lossless compression - If num_colors >= 194, pick lossy compression - Otherwise, try both and pick the one that compresses better. Change-Id: I908c73493ddc38e8db35b7b1959300569e6d3a97
604 lines
20 KiB
C
604 lines
20 KiB
C
// Copyright 2012 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// simple tool to convert animated GIFs to WebP
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//
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// Authors: Skal (pascal.massimino@gmail.com)
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// Urvang (urvang@google.com)
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#include <assert.h>
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#include <stdio.h>
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#include <string.h>
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef WEBP_HAVE_GIF
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#include <gif_lib.h>
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#include "webp/encode.h"
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#include "webp/mux.h"
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#include "./example_util.h"
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#include "./gif2webp_util.h"
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#define GIF_TRANSPARENT_MASK 0x01
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#define GIF_DISPOSE_MASK 0x07
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#define GIF_DISPOSE_SHIFT 2
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#define WHITE_COLOR 0xffffffff
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#define MAX_CACHE_SIZE 30
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//------------------------------------------------------------------------------
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static int transparent_index = -1; // Index of transparent color in the map.
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static void SanitizeKeyFrameIntervals(size_t* const kmin_ptr,
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size_t* const kmax_ptr) {
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size_t kmin = *kmin_ptr;
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size_t kmax = *kmax_ptr;
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int print_warning = 1;
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if (kmin == 0) { // Disable keyframe insertion.
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kmax = ~0;
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kmin = kmax - 1;
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print_warning = 0;
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}
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if (kmax == 0) {
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kmax = ~0;
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print_warning = 0;
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}
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if (kmin >= kmax) {
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kmin = kmax - 1;
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if (print_warning) {
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fprintf(stderr,
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"WARNING: Setting kmin = %zu, so that kmin < kmax.\n", kmin);
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}
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} else if (kmin < (kmax / 2 + 1)) {
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// This ensures that cache.keyframe + kmin >= kmax is always true. So, we
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// can flush all the frames in the ‘count_since_key_frame == kmax’ case.
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kmin = (kmax / 2 + 1);
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if (print_warning) {
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fprintf(stderr,
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"WARNING: Setting kmin = %zu, so that kmin >= kmax / 2 + 1.\n",
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kmin);
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}
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}
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// Limit the max number of frames that are allocated.
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if (kmax - kmin > MAX_CACHE_SIZE) {
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kmin = kmax - MAX_CACHE_SIZE;
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if (print_warning) {
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fprintf(stderr,
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"WARNING: Setting kmin = %zu, so that kmax - kmin <= 30.\n",
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kmin);
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}
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}
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*kmin_ptr = kmin;
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*kmax_ptr = kmax;
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}
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static void Remap(const uint8_t* const src, const GifFileType* const gif,
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uint32_t* dst, int len) {
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int i;
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const GifColorType* colors;
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const ColorMapObject* const cmap =
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gif->Image.ColorMap ? gif->Image.ColorMap : gif->SColorMap;
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if (cmap == NULL) return;
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colors = cmap->Colors;
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for (i = 0; i < len; ++i) {
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const GifColorType c = colors[src[i]];
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dst[i] = (src[i] == transparent_index) ? WEBP_UTIL_TRANSPARENT_COLOR
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: c.Blue | (c.Green << 8) | (c.Red << 16) | (0xff << 24);
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}
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}
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// Read the GIF image frame.
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static int ReadFrame(GifFileType* const gif, WebPFrameRect* const gif_rect,
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WebPPicture* const webp_frame) {
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WebPPicture sub_image;
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const GifImageDesc image_desc = gif->Image;
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uint32_t* dst = NULL;
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uint8_t* tmp = NULL;
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int ok = 0;
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WebPFrameRect rect = {
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image_desc.Left, image_desc.Top, image_desc.Width, image_desc.Height
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};
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*gif_rect = rect;
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// Use a view for the sub-picture:
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if (!WebPPictureView(webp_frame, rect.x_offset, rect.y_offset,
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rect.width, rect.height, &sub_image)) {
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fprintf(stderr, "Sub-image %dx%d at position %d,%d is invalid!\n",
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rect.width, rect.height, rect.x_offset, rect.y_offset);
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return 0;
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}
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dst = sub_image.argb;
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tmp = (uint8_t*)malloc(rect.width * sizeof(*tmp));
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if (tmp == NULL) goto End;
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if (image_desc.Interlace) { // Interlaced image.
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// We need 4 passes, with the following offsets and jumps.
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const int interlace_offsets[] = { 0, 4, 2, 1 };
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const int interlace_jumps[] = { 8, 8, 4, 2 };
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int pass;
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for (pass = 0; pass < 4; ++pass) {
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int y;
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for (y = interlace_offsets[pass]; y < rect.height;
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y += interlace_jumps[pass]) {
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if (DGifGetLine(gif, tmp, rect.width) == GIF_ERROR) goto End;
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Remap(tmp, gif, dst + y * sub_image.argb_stride, rect.width);
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}
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}
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} else { // Non-interlaced image.
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int y;
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for (y = 0; y < rect.height; ++y) {
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if (DGifGetLine(gif, tmp, rect.width) == GIF_ERROR) goto End;
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Remap(tmp, gif, dst + y * sub_image.argb_stride, rect.width);
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}
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}
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ok = 1;
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End:
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if (!ok) webp_frame->error_code = sub_image.error_code;
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WebPPictureFree(&sub_image);
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free(tmp);
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return ok;
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}
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static int GetBackgroundColor(const ColorMapObject* const color_map,
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GifWord bgcolor_idx, uint32_t* const bgcolor) {
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if (transparent_index != -1 && bgcolor_idx == transparent_index) {
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*bgcolor = WEBP_UTIL_TRANSPARENT_COLOR; // Special case.
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return 1;
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} else if (color_map == NULL || color_map->Colors == NULL
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|| bgcolor_idx >= color_map->ColorCount) {
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return 0; // Invalid color map or index.
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} else {
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const GifColorType color = color_map->Colors[bgcolor_idx];
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*bgcolor = (0xff << 24)
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| (color.Red << 16)
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| (color.Green << 8)
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| (color.Blue << 0);
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return 1;
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}
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}
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static void DisplayGifError(const GifFileType* const gif, int gif_error) {
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// GIFLIB_MAJOR is only defined in libgif >= 4.2.0.
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// libgif 4.2.0 has retired PrintGifError() and added GifErrorString().
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#if defined(GIFLIB_MAJOR) && defined(GIFLIB_MINOR) && \
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((GIFLIB_MAJOR == 4 && GIFLIB_MINOR >= 2) || GIFLIB_MAJOR > 4)
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#if GIFLIB_MAJOR >= 5
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// Static string actually, hence the const char* cast.
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const char* error_str = (const char*)GifErrorString(
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(gif == NULL) ? gif_error : gif->Error);
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#else
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const char* error_str = (const char*)GifErrorString();
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(void)gif;
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#endif
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if (error_str == NULL) error_str = "Unknown error";
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fprintf(stderr, "GIFLib Error %d: %s\n", gif_error, error_str);
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#else
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(void)gif;
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fprintf(stderr, "GIFLib Error %d: ", gif_error);
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PrintGifError();
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fprintf(stderr, "\n");
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#endif
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}
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static const char* const kErrorMessages[] = {
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"WEBP_MUX_NOT_FOUND", "WEBP_MUX_INVALID_ARGUMENT", "WEBP_MUX_BAD_DATA",
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"WEBP_MUX_MEMORY_ERROR", "WEBP_MUX_NOT_ENOUGH_DATA"
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};
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static const char* ErrorString(WebPMuxError err) {
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assert(err <= WEBP_MUX_NOT_FOUND && err >= WEBP_MUX_NOT_ENOUGH_DATA);
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return kErrorMessages[-err];
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}
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//------------------------------------------------------------------------------
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static void Help(void) {
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printf("Usage:\n");
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printf(" gif2webp [options] gif_file -o webp_file\n");
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printf("options:\n");
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printf(" -h / -help ............ this help\n");
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printf(" -lossy ................. Encode image using lossy compression.\n");
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printf(" -mixed ................. For each frame in the image, pick lossy\n"
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" or lossless compression heuristically.\n");
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printf(" -q <float> ............. quality factor (0:small..100:big)\n");
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printf(" -m <int> ............... compression method (0=fast, 6=slowest)\n");
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printf(" -kmin <int> ............ Min distance between key frames\n");
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printf(" -kmax <int> ............ Max distance between key frames\n");
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printf(" -f <int> ............... filter strength (0=off..100)\n");
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printf("\n");
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printf(" -version ............... print version number and exit.\n");
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printf(" -v ..................... verbose.\n");
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printf(" -quiet ................. don't print anything.\n");
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printf("\n");
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}
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//------------------------------------------------------------------------------
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int main(int argc, const char *argv[]) {
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int verbose = 0;
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int gif_error = GIF_ERROR;
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WebPMuxError err = WEBP_MUX_OK;
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int ok = 0;
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const char *in_file = NULL, *out_file = NULL;
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FILE* out = NULL;
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GifFileType* gif = NULL;
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WebPConfig config;
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WebPPicture frame;
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WebPMuxFrameInfo info;
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WebPMuxAnimParams anim = { WHITE_COLOR, 0 };
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WebPFrameCache* cache = NULL;
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int is_first_frame = 1; // Whether we are processing the first frame.
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int done;
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int c;
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int quiet = 0;
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WebPMux* mux = NULL;
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WebPData webp_data = { NULL, 0 };
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int stored_icc = 0; // Whether we have already stored an ICC profile.
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int stored_xmp = 0;
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int default_kmin = 1; // Whether to use default kmin value.
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int default_kmax = 1;
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size_t kmin = 0;
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size_t kmax = 0;
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int allow_mixed = 0; // If true, each frame can be lossy or lossless.
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memset(&info, 0, sizeof(info));
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info.id = WEBP_CHUNK_ANMF;
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info.dispose_method = WEBP_MUX_DISPOSE_BACKGROUND;
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info.blend_method = WEBP_MUX_BLEND;
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if (!WebPConfigInit(&config) || !WebPPictureInit(&frame)) {
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fprintf(stderr, "Error! Version mismatch!\n");
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return -1;
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}
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config.lossless = 1; // Use lossless compression by default.
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config.image_hint = WEBP_HINT_GRAPH; // always low-color
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if (argc == 1) {
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Help();
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return 0;
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}
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for (c = 1; c < argc; ++c) {
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if (!strcmp(argv[c], "-h") || !strcmp(argv[c], "-help")) {
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Help();
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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], "-lossy")) {
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config.lossless = 0;
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} else if (!strcmp(argv[c], "-mixed")) {
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allow_mixed = 1;
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config.lossless = 0;
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} else if (!strcmp(argv[c], "-q") && c < argc - 1) {
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config.quality = (float)strtod(argv[++c], NULL);
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} else if (!strcmp(argv[c], "-m") && c < argc - 1) {
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config.method = strtol(argv[++c], NULL, 0);
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} else if (!strcmp(argv[c], "-kmax") && c < argc - 1) {
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kmax = strtoul(argv[++c], NULL, 0);
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default_kmax = 0;
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} else if (!strcmp(argv[c], "-kmin") && c < argc - 1) {
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kmin = strtoul(argv[++c], NULL, 0);
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default_kmin = 0;
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} else if (!strcmp(argv[c], "-f") && c < argc - 1) {
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config.filter_strength = strtol(argv[++c], NULL, 0);
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} else if (!strcmp(argv[c], "-version")) {
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const int enc_version = WebPGetEncoderVersion();
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const int mux_version = WebPGetMuxVersion();
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printf("WebP Encoder version: %d.%d.%d\nWebP Mux version: %d.%d.%d\n",
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(enc_version >> 16) & 0xff, (enc_version >> 8) & 0xff,
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enc_version & 0xff, (mux_version >> 16) & 0xff,
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(mux_version >> 8) & 0xff, mux_version & 0xff);
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return 0;
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} else if (!strcmp(argv[c], "-quiet")) {
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quiet = 1;
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} else if (!strcmp(argv[c], "-v")) {
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verbose = 1;
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} else if (argv[c][0] == '-') {
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fprintf(stderr, "Error! Unknown option '%s'\n", argv[c]);
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Help();
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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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// Appropriate default kmin, kmax values for lossy and lossless.
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if (default_kmin) {
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kmin = config.lossless ? 9 : 3;
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}
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if (default_kmax) {
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kmax = config.lossless ? 17 : 5;
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}
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SanitizeKeyFrameIntervals(&kmin, &kmax);
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if (!WebPValidateConfig(&config)) {
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fprintf(stderr, "Error! Invalid configuration.\n");
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goto End;
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}
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if (in_file == NULL) {
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fprintf(stderr, "No input file specified!\n");
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Help();
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goto End;
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}
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// Start the decoder object
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#if defined(GIFLIB_MAJOR) && (GIFLIB_MAJOR >= 5)
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// There was an API change in version 5.0.0.
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gif = DGifOpenFileName(in_file, &gif_error);
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#else
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gif = DGifOpenFileName(in_file);
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#endif
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if (gif == NULL) goto End;
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// Allocate current buffer
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frame.width = gif->SWidth;
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frame.height = gif->SHeight;
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frame.use_argb = 1;
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if (!WebPPictureAlloc(&frame)) goto End;
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// Initialize cache
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cache = WebPFrameCacheNew(frame.width, frame.height, kmin, kmax, allow_mixed);
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if (cache == NULL) goto End;
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mux = WebPMuxNew();
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if (mux == NULL) {
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fprintf(stderr, "ERROR: could not create a mux object.\n");
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goto End;
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}
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// Loop over GIF images
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done = 0;
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do {
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GifRecordType type;
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if (DGifGetRecordType(gif, &type) == GIF_ERROR) goto End;
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switch (type) {
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case IMAGE_DESC_RECORD_TYPE: {
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WebPFrameRect gif_rect;
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if (!DGifGetImageDesc(gif)) goto End;
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if (!ReadFrame(gif, &gif_rect, &frame)) {
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goto End;
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}
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if (!WebPFrameCacheAddFrame(cache, &config, &gif_rect, &frame, &info)) {
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fprintf(stderr, "Error! Cannot encode frame as WebP\n");
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fprintf(stderr, "Error code: %d\n", frame.error_code);
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}
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err = WebPFrameCacheFlush(cache, verbose, mux);
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if (err != WEBP_MUX_OK) {
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fprintf(stderr, "ERROR (%s): Could not add animation frame.\n",
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ErrorString(err));
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goto End;
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}
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is_first_frame = 0;
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break;
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}
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case EXTENSION_RECORD_TYPE: {
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int extension;
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GifByteType *data = NULL;
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if (DGifGetExtension(gif, &extension, &data) == GIF_ERROR) {
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goto End;
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}
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switch (extension) {
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case COMMENT_EXT_FUNC_CODE: {
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break; // Do nothing for now.
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}
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case GRAPHICS_EXT_FUNC_CODE: {
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const int flags = data[1];
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const int dispose = (flags >> GIF_DISPOSE_SHIFT) & GIF_DISPOSE_MASK;
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const int delay = data[2] | (data[3] << 8); // In 10 ms units.
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if (data[0] != 4) goto End;
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info.duration = delay * 10; // Duration is in 1 ms units for WebP.
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if (dispose == 3) {
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static int warning_printed = 0;
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if (!warning_printed) {
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fprintf(stderr, "WARNING: GIF_DISPOSE_RESTORE unsupported.\n");
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warning_printed = 1;
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}
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// failsafe. TODO(urvang): emulate the correct behaviour by
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// recoding the whole frame.
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info.dispose_method = WEBP_MUX_DISPOSE_BACKGROUND;
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} else {
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info.dispose_method =
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(dispose == 2) ? WEBP_MUX_DISPOSE_BACKGROUND
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: WEBP_MUX_DISPOSE_NONE;
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}
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transparent_index = (flags & GIF_TRANSPARENT_MASK) ? data[4] : -1;
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if (is_first_frame) {
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if (!GetBackgroundColor(gif->SColorMap, gif->SBackGroundColor,
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&anim.bgcolor)) {
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fprintf(stderr, "GIF decode warning: invalid background color "
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"index. Assuming white background.\n");
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}
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WebPUtilClearPic(&frame, NULL);
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}
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break;
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}
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case PLAINTEXT_EXT_FUNC_CODE: {
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break;
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}
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case APPLICATION_EXT_FUNC_CODE: {
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if (data[0] != 11) break; // Chunk is too short
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if (!memcmp(data + 1, "NETSCAPE2.0", 11)) {
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// Recognize and parse Netscape2.0 NAB extension for loop count.
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if (DGifGetExtensionNext(gif, &data) == GIF_ERROR) goto End;
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if (data == NULL) goto End; // Loop count sub-block missing.
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if (data[0] != 3 && data[1] != 1) break; // wrong size/marker
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anim.loop_count = data[2] | (data[3] << 8);
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if (verbose) printf("Loop count: %d\n", anim.loop_count);
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} else { // An extension containing metadata.
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// We only store the first encountered chunk of each type.
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const int is_xmp =
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!stored_xmp && !memcmp(data + 1, "XMP DataXMP", 11);
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const int is_icc =
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!stored_icc && !memcmp(data + 1, "ICCRGBG1012", 11);
|
||
if (is_xmp || is_icc) {
|
||
const char* const fourccs[2] = { "XMP " , "ICCP" };
|
||
const char* const features[2] = { "XMP" , "ICC" };
|
||
WebPData metadata = { NULL, 0 };
|
||
// Construct metadata from sub-blocks.
|
||
// Usual case (including ICC profile): In each sub-block, the
|
||
// first byte specifies its size in bytes (0 to 255) and the
|
||
// rest of the bytes contain the data.
|
||
// Special case for XMP data: In each sub-block, the first byte
|
||
// is also part of the XMP payload. XMP in GIF also has a 257
|
||
// byte padding data. See the XMP specification for details.
|
||
while (1) {
|
||
WebPData prev_metadata = metadata;
|
||
WebPData subblock;
|
||
if (DGifGetExtensionNext(gif, &data) == GIF_ERROR) {
|
||
WebPDataClear(&metadata);
|
||
goto End;
|
||
}
|
||
if (data == NULL) break; // Finished.
|
||
subblock.size = is_xmp ? data[0] + 1 : data[0];
|
||
assert(subblock.size > 0);
|
||
subblock.bytes = is_xmp ? data : data + 1;
|
||
metadata.bytes =
|
||
(uint8_t*)realloc((void*)metadata.bytes,
|
||
prev_metadata.size + subblock.size);
|
||
if (metadata.bytes == NULL) {
|
||
WebPDataClear(&prev_metadata);
|
||
goto End;
|
||
}
|
||
metadata.size += subblock.size;
|
||
memcpy((void*)(metadata.bytes + prev_metadata.size),
|
||
subblock.bytes, subblock.size);
|
||
}
|
||
if (is_xmp) {
|
||
// XMP padding data is 0x01, 0xff, 0xfe ... 0x01, 0x00.
|
||
const size_t xmp_pading_size = 257;
|
||
if (metadata.size > xmp_pading_size) {
|
||
metadata.size -= xmp_pading_size;
|
||
}
|
||
}
|
||
|
||
// Add metadata chunk.
|
||
err = WebPMuxSetChunk(mux, fourccs[is_icc], &metadata, 1);
|
||
if (verbose) {
|
||
printf("%s size: %d\n", features[is_icc], (int)metadata.size);
|
||
}
|
||
WebPDataClear(&metadata);
|
||
if (err != WEBP_MUX_OK) {
|
||
fprintf(stderr, "ERROR (%s): Could not set %s chunk.\n",
|
||
ErrorString(err), features[is_icc]);
|
||
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);
|
||
|
||
// Flush any pending frames.
|
||
err = WebPFrameCacheFlushAll(cache, verbose, mux);
|
||
if (err != WEBP_MUX_OK) {
|
||
fprintf(stderr, "ERROR (%s): Could not add animation frame.\n",
|
||
ErrorString(err));
|
||
goto End;
|
||
}
|
||
|
||
// Finish muxing
|
||
err = WebPMuxSetAnimationParams(mux, &anim);
|
||
if (err != WEBP_MUX_OK) {
|
||
fprintf(stderr, "ERROR (%s): Could not set animation parameters.\n",
|
||
ErrorString(err));
|
||
goto End;
|
||
}
|
||
|
||
err = WebPMuxAssemble(mux, &webp_data);
|
||
if (err != WEBP_MUX_OK) {
|
||
fprintf(stderr, "ERROR (%s) assembling the WebP file.\n", ErrorString(err));
|
||
goto End;
|
||
}
|
||
if (out_file != NULL) {
|
||
if (!ExUtilWriteFile(out_file, webp_data.bytes, webp_data.size)) {
|
||
fprintf(stderr, "Error writing output file: %s\n", out_file);
|
||
goto End;
|
||
}
|
||
if (!quiet) {
|
||
printf("Saved output file: %s\n", out_file);
|
||
}
|
||
} else {
|
||
if (!quiet) {
|
||
printf("Nothing written; use -o flag to save the result.\n");
|
||
}
|
||
}
|
||
|
||
// All OK.
|
||
ok = 1;
|
||
gif_error = GIF_OK;
|
||
|
||
End:
|
||
WebPDataClear(&webp_data);
|
||
WebPMuxDelete(mux);
|
||
WebPPictureFree(&frame);
|
||
WebPFrameCacheDelete(cache);
|
||
if (out != NULL && out_file != NULL) fclose(out);
|
||
|
||
if (gif_error != GIF_OK) {
|
||
DisplayGifError(gif, gif_error);
|
||
}
|
||
if (gif != NULL) {
|
||
DGifCloseFile(gif);
|
||
}
|
||
|
||
return !ok;
|
||
}
|
||
|
||
#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 0;
|
||
}
|
||
|
||
#endif
|
||
|
||
//------------------------------------------------------------------------------
|