mirror of
https://github.com/webmproject/libwebp.git
synced 2024-12-26 13:48:21 +01:00
add support for animation
it's using glutTimerFunc() for trigger next frame's decoding Reminder: how to build and use manually (integration in makefile.unix coming soon) Unix: cd libwebp make -f makefile.unix cd examples cc -o vwebp vwebp.c -framework GLUT -framework OpenGL -I../src/ ../src/libwebp.a ../src/mux/libwebpmux.a Mac + xcode: cd libwebp make -f makefile.unix cd examples cc -o vwebp vwebp.c -lglut -lGL -lpthread -lm -I../src/ ../src/libwebp.a ../src/mux/libwebpmux.a Change-Id: Id49e87c26628c2b58ec221f6030cbd2e46a807b4
This commit is contained in:
Pascal Massimino
parent
eb5c16cc18
commit
861a5b7bc9
228
examples/vwebp.c
228
examples/vwebp.c
@ -9,9 +9,9 @@
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//
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// Compiling on linux:
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// sudo apt-get install libglut3-dev mesa-common-dev
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// gcc -o vwebp vwebp.c -O3 -lwebp -lglut -lGL
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// gcc -o vwebp vwebp.c -O3 -lwebp -lwebpmux -lglut -lGL -lpthread -lm
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// Compiling on Mac + XCode:
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// gcc -o vwebp vwebp.c -lwebp -framework GLUT -framework OpenGL
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// gcc -o vwebp vwebp.c -lwebp -lwebpmux -framework GLUT -framework OpenGL
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//
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// Author: Skal (pascal.massimino@gmail.com)
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@ -20,6 +20,7 @@
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#include <string.h>
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#include "webp/decode.h"
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#include "webp/mux.h"
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#ifdef __APPLE__
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#include <GLUT/glut.h>
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@ -34,10 +35,51 @@
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#define snprintf _snprintf
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#endif
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// Unfortunate global variables
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static const WebPDecBuffer* kPic = NULL;
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static const char* file_name = NULL;
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static int print_info = 0;
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static void Help(void);
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// Unfortunate global variables. Gathered into a struct for comfort.
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static struct {
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int has_animation;
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int done;
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int decoding_error;
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int print_info;
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uint32_t flags;
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uint32_t loop_count;
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int frame_num;
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int frame_max;
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const char* file_name;
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WebPData data;
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WebPMux* mux;
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WebPDecoderConfig* config;
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const WebPDecBuffer* pic;
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} kParams = {
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0, 0, 0, 0, // has_animation, ...
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0, 1, 1, 0, // flags, ...
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NULL, { NULL, 0 }, // file_name, ...
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NULL, NULL, NULL // mux, ...
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};
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static void ClearPreviousPic(void) {
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WebPFreeDecBuffer((WebPDecBuffer*)kParams.pic);
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kParams.pic = NULL;
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}
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static void ClearData(WebPData* data) {
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if (data != NULL) {
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free((void*)data->bytes_);
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data->bytes_ = NULL;
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data->size_ = 0;
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}
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}
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static void ClearParams(void) {
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ClearPreviousPic();
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ClearData(&kParams.data);
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WebPMuxDelete(kParams.mux);
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kParams.mux = NULL;
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}
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//------------------------------------------------------------------------------
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// Callbacks
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@ -49,12 +91,11 @@ static void HandleKey(unsigned char key, int pos_x, int pos_y) {
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#ifdef FREEGLUT
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glutLeaveMainLoop();
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#else
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WebPFreeDecBuffer((WebPDecBuffer*)kPic);
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kPic = NULL;
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ClearParams();
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exit(0);
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#endif
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} else if (key == 'i') {
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print_info = 1 - print_info;
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kParams.print_info = 1 - kParams.print_info;
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glutPostRedisplay();
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}
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}
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@ -78,23 +119,25 @@ static void PrintString(const char* const text) {
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}
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static void HandleDisplay(void) {
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if (kPic == NULL) return;
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const WebPDecBuffer* pic = kParams.pic;
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if (pic == NULL) return;
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glClear(GL_COLOR_BUFFER_BIT);
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glPushMatrix();
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glPixelZoom(1, -1);
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glRasterPos2f(-1, 1);
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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glPixelStorei(GL_UNPACK_ROW_LENGTH, kPic->u.RGBA.stride / 4);
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glDrawPixels(kPic->width, kPic->height, GL_RGBA, GL_UNSIGNED_BYTE,
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(GLvoid*)kPic->u.RGBA.rgba);
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if (print_info) {
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glPixelStorei(GL_UNPACK_ROW_LENGTH, pic->u.RGBA.stride / 4);
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glDrawPixels(pic->width, pic->height,
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GL_RGBA, GL_UNSIGNED_BYTE,
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(GLvoid*)pic->u.RGBA.rgba);
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if (kParams.print_info) {
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char tmp[32];
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glColor4f(0.0, 0.0, 0.0, 0.0);
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glRasterPos2f(-0.95f, 0.90f);
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PrintString(file_name);
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PrintString(kParams.file_name);
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snprintf(tmp, sizeof(tmp), "Dimension:%d x %d", kPic->width, kPic->height);
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snprintf(tmp, sizeof(tmp), "Dimension:%d x %d", pic->width, pic->height);
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glColor4f(0.0, 0.0, 0.0, 0.0);
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glRasterPos2f(-0.95f, 0.80f);
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PrintString(tmp);
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@ -102,38 +145,35 @@ static void HandleDisplay(void) {
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glFlush();
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}
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static void Show(const WebPDecBuffer* const pic) {
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static void StartDisplay(const WebPDecBuffer* const pic) {
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glutInitDisplayMode(GLUT_RGBA);
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glutInitWindowSize(pic->width, pic->height);
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glutCreateWindow("WebP viewer");
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glutReshapeFunc(HandleReshape);
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glutDisplayFunc(HandleDisplay);
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glutIdleFunc(NULL);
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glutKeyboardFunc(HandleKey);
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glClearColor(0.0, 0.0, 0.0, 0.0);
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HandleReshape(pic->width, pic->height);
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glutMainLoop();
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}
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//------------------------------------------------------------------------------
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// File decoding
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static const char* const kStatusMessages[] = {
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"OK", "OUT_OF_MEMORY", "INVALID_PARAM", "BITSTREAM_ERROR",
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"UNSUPPORTED_FEATURE", "SUSPENDED", "USER_ABORT", "NOT_ENOUGH_DATA"
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};
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static int Decode(const char* const in_file, WebPDecoderConfig* const config) {
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WebPDecBuffer* const output_buffer = &config->output;
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WebPBitstreamFeatures* const bitstream = &config->input;
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VP8StatusCode status = VP8_STATUS_OK;
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static int ReadFile(void) {
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int ok;
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size_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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size_t data_size = 0;
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const char* const file_name = kParams.file_name;
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FILE* in = NULL;
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if (!in) {
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fprintf(stderr, "cannot open input file '%s'\n", in_file);
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if (file_name == NULL) {
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printf("missing input file!!\n");
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Help();
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return 0;
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}
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in = fopen(file_name, "rb");
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if (in == NULL) {
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fprintf(stderr, "cannot open input file '%s'\n", file_name);
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return 0;
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}
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fseek(in, 0, SEEK_END);
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@ -143,31 +183,73 @@ static int Decode(const char* const in_file, WebPDecoderConfig* const config) {
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if (data == NULL) return 0;
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ok = (fread(data, data_size, 1, in) == 1);
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fclose(in);
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kParams.data.bytes_ = data;
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kParams.data.size_ = data_size;
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if (!ok) {
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fprintf(stderr, "Could not read %zu bytes of data from file %s\n",
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data_size, in_file);
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free(data);
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data_size, file_name);
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return 0;
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}
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return 1;
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}
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status = WebPGetFeatures((const uint8_t*)data, data_size, bitstream);
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if (status != VP8_STATUS_OK) {
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goto end;
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static int Decode(const int frame_number, uint32_t* const duration) {
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WebPDecoderConfig* const config = kParams.config;
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WebPData *data, image_data;
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uint32_t x_off = 0, y_off = 0;
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WebPDecBuffer* const output_buffer = &config->output;
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int ok = 0;
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ClearPreviousPic();
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if (kParams.has_animation) {
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if (WebPMuxGetFrame(kParams.mux, frame_number, &image_data, NULL,
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&x_off, &y_off, duration) != WEBP_MUX_OK) {
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goto end;
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}
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if (x_off != 0 || y_off != 0) {
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fprintf(stderr,
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"Tiling and offsets not yet supported! Forcing offset to 0,0\n");
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x_off = y_off = 0;
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}
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data = &image_data;
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} else {
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data = &kParams.data;
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}
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output_buffer->colorspace = MODE_RGBA;
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status = WebPDecode((const uint8_t*)data, data_size, config);
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ok = (WebPDecode(data->bytes_, data->size_, config) == VP8_STATUS_OK);
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end:
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free(data);
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ok = (status == VP8_STATUS_OK);
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if (!ok) {
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fprintf(stderr, "Decoding of %s failed.\n", in_file);
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fprintf(stderr, "Status: %d (%s)\n", status, kStatusMessages[status]);
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fprintf(stderr, "Decoding of frame #%d failed!\n", frame_number);
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} else {
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kParams.pic = output_buffer;
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}
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return ok;
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}
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static void decode_callback(int what) {
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if (what == 0 && !kParams.done) {
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uint32_t duration = 0;
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if (kParams.mux != NULL) {
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if (!Decode(kParams.frame_num, &duration)) {
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kParams.decoding_error = 1;
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kParams.done = 1;
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} else {
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++kParams.frame_num;
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if (kParams.frame_num > kParams.frame_max) {
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kParams.frame_num = 1;
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--kParams.loop_count;
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kParams.done = (kParams.loop_count == 0);
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}
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}
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}
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glutPostRedisplay();
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glutTimerFunc(duration, decode_callback, what);
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}
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}
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//------------------------------------------------------------------------------
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// Main
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@ -187,12 +269,14 @@ static void Help(void) {
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int main(int argc, char *argv[]) {
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WebPDecoderConfig config;
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WebPMuxError mux_err;
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int c;
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if (!WebPInitDecoderConfig(&config)) {
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fprintf(stderr, "Library version mismatch!\n");
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return -1;
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}
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kParams.config = &config;
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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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@ -224,29 +308,63 @@ int main(int argc, char *argv[]) {
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Help();
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return -1;
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} else {
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file_name = argv[c];
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kParams.file_name = argv[c];
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}
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}
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if (file_name == NULL) {
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printf("missing input file!!\n");
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Help();
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return -1;
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}
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if (!Decode(file_name, &config)) {
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return -1;
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if (!ReadFile()) goto Error;
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kParams.mux =
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WebPMuxCreate(kParams.data.bytes_, kParams.data.size_, 0, NULL);
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if (kParams.mux == NULL) {
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fprintf(stderr, "Could not create demuxing object!\n");
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goto Error;
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}
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kPic = &config.output;
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printf("Displaying [%s]: %d x %d. Press Esc to exit, 'i' for info.\n",
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file_name, kPic->width, kPic->height);
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mux_err = WebPMuxGetFeatures(kParams.mux, &kParams.flags);
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if (mux_err != WEBP_MUX_OK) {
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goto Error;
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}
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if (kParams.flags & TILE_FLAG) {
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fprintf(stderr, "Tiling is not supported for now!\n");
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goto Error;
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}
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kParams.has_animation = !!(kParams.flags & ANIMATION_FLAG);
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if (kParams.has_animation) {
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mux_err = WebPMuxGetLoopCount(kParams.mux, &kParams.loop_count);
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if (mux_err != WEBP_MUX_OK && mux_err != WEBP_MUX_NOT_FOUND) {
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goto Error;
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}
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mux_err = WebPMuxNumNamedElements(kParams.mux, "image",
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&kParams.frame_max);
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if (mux_err != WEBP_MUX_OK && mux_err != WEBP_MUX_NOT_FOUND) {
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goto Error;
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}
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printf("VP8X: Found %d images in file (loop count = %d)\n",
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kParams.frame_max, kParams.loop_count);
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}
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// Decode first frame
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{
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uint32_t duration;
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if (!Decode(1, &duration)) goto Error;
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}
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// Start display (and timer)
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glutInit(&argc, argv);
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Show(kPic);
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StartDisplay(kParams.pic);
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if (kParams.has_animation) glutTimerFunc(0, decode_callback, 0);
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glutMainLoop();
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// Should only be reached when using FREEGLUT:
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WebPFreeDecBuffer(&config.output);
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ClearParams();
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return 0;
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Error:
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ClearParams();
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return -1;
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}
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//------------------------------------------------------------------------------
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