emote2ss

commit 0b1662e3fee888fddaa09c8fb362f05de9b5108e
Author: bsandro <email@bsandro.tech>
Date:   Wed,  3 May 2023 01:01:42 +0300

Basic reading webp info

Diffstat:
A
.gitignore
 | 
2
++
A
FlanClap.webp
 | 
0

A
Makefile
 | 
26
++++++++++++++++++++++++++
A
src/main.c
 | 
116
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

4 files changed, 144 insertions(+), 0 deletions(-)
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1,2 @@
+emote2ss
+*.o
diff --git a/FlanClap.webp b/FlanClap.webp
Binary files differ.
diff --git a/Makefile b/Makefile
@@ -0,0 +1,26 @@
+NAME=$(shell basename ${PWD})
+SRC=$(wildcard *.c src/*.c)
+DEPS:=$(wildcard *.h src/*.h)
+OBJ:=$(SRC:.c=.o)
+LIBS:=libwebp libwebpdecoder libwebpdemux
+CFLAGS=-Og -g -std=c99 -Werror -Wall -Wextra -I. -I./src/ ${shell pkg-config --cflags $(LIBS)}
+LDFLAGS=-lc ${shell pkg-config --libs $(LIBS)}
+
+all: $(NAME)
+
+.PHONY: clean run test
+
+clean:
+	@rm -f $(OBJ) $(NAME)
+
+%.o : %.c $(DEPS)
+	@$(CC) $(CFLAGS) -c $< -o $@
+
+$(NAME): $(OBJ)
+	@$(CC) $(OBJ) -o $@ $(LDFLAGS)
+
+run: $(NAME)
+	@./$(NAME)
+
+test: $(NAME)
+	@./$(NAME) FlanClap.webp
diff --git a/src/main.c b/src/main.c
@@ -0,0 +1,116 @@
+#include <stdio.h>
+#include "webp/decode.h"
+#include "webp/demux.h"
+#include <stdbool.h>
+#include <stdlib.h>
+
+static void print_webp_version() {
+	int dec_ver = WebPGetDecoderVersion();
+	int demux_ver = WebPGetDemuxVersion();
+	printf("---------------------------\n");
+	printf("webp decoder version: %d.%d.%d\n", (dec_ver>>16)&0xff, (dec_ver>>8)&0xff, dec_ver&0xff);
+	printf("webp demuxer version: %d.%d.%d\n", (demux_ver>>16)&0xff, (demux_ver>>8)&0xff, demux_ver&0xff);
+}
+
+typedef struct {
+	uint8_t *rgba;
+	int duration;
+	bool is_key;
+} DecodedFrame;
+
+typedef struct {
+	int width, height, bgcolor, loop_count;
+	DecodedFrame *frames;
+	uint32_t frames_count;
+	void *raw_mem;
+} AnimatedImage;
+
+int read_file(const char *fname, const uint8_t **data, size_t *size) {
+	if (data == NULL || size == NULL) return -1;
+	*data = NULL;
+	*size = 0;
+	FILE *infile = fopen(fname, "rb");
+	if (infile == NULL) {
+		fprintf(stderr, "cannot open file %s\n", fname);
+		return -1;
+	}
+	fseek(infile, 0, SEEK_END);
+	size_t fsize = ftell(infile);
+	printf("%s: %zu bytes\n", fname, fsize);
+	fseek(infile, 0, SEEK_SET);
+
+	uint8_t *fdata = malloc(fsize+1);
+	if (fdata == NULL) {
+		fclose(infile);
+		fprintf(stderr, "malloc failed\n");
+		return -1;
+	}
+	fdata[fsize] = '\0';
+	int ok = (fread(fdata, fsize, 1, infile)==1);
+	fclose(infile);
+
+	if (!ok) {
+		fprintf(stderr, "cannot read file %s (%d)\n", fname, ok);
+		free(fdata);
+		return -1;
+	}
+
+	*data = fdata;
+	*size = fsize;
+
+	return 0;
+}
+
+int read_webp(const char *fname, AnimatedImage *anim) {
+	printf("read_webp(%s)\n", fname);
+
+	WebPData webp_data;
+	WebPDataInit(&webp_data);
+
+	if (read_file(fname, &webp_data.bytes, &webp_data.size) == -1) {
+		fprintf(stderr, "read_file error\n");
+		return -1;
+	}
+
+	if (!WebPGetInfo(webp_data.bytes, webp_data.size, NULL, NULL)) {
+		fprintf(stderr, "invalid webp\n");
+		WebPDataClear(&webp_data);
+		return -1;
+	}
+
+	WebPAnimDecoder *dec = WebPAnimDecoderNew(&webp_data, NULL);
+	if (dec == NULL) {
+		fprintf(stderr, "decoder error\n");
+		// @todo cleanup
+		return -1;
+	}
+
+	WebPAnimInfo anim_info;
+	if (!WebPAnimDecoderGetInfo(dec, &anim_info)) {
+		fprintf(stderr, "error decoding animation info\n");
+		// @todo cleanup
+		return -1;
+	}
+	anim->frames_count = anim_info.frame_count;
+	anim->width = anim_info.canvas_width;
+	anim->height = anim_info.canvas_height;
+	anim->loop_count = anim_info.loop_count;
+	anim->bgcolor = anim_info.bgcolor;
+
+	WebPDataClear(&webp_data);
+	return 0;
+}
+
+int main(int argc, const char **argv) {
+	atexit(print_webp_version);
+
+	if (argc >= 1) {
+		for (int i=1; i<argc; ++i) {
+			AnimatedImage anim = {0};
+			read_webp(argv[i], &anim);
+			printf("dimensions: %dx%d\nframes: %d\n", anim.width, anim.height, anim.frames_count);
+		}
+	}
+
+	return 0;
+}