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add support for animation

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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 2012-05-09 00:41:12 -07:00
parent eb5c16cc18
commit 861a5b7bc9
1 changed files with 173 additions and 55 deletions
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228
examples/vwebp.c
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@ -9,9 +9,9 @@
// //
// Compiling on linux: // Compiling on linux:
// sudo apt-get install libglut3-dev mesa-common-dev // sudo apt-get install libglut3-dev mesa-common-dev
// gcc -o vwebp vwebp.c -O3 -lwebp -lglut -lGL // gcc -o vwebp vwebp.c -O3 -lwebp -lwebpmux -lglut -lGL -lpthread -lm
// Compiling on Mac + XCode: // Compiling on Mac + XCode:
// gcc -o vwebp vwebp.c -lwebp -framework GLUT -framework OpenGL // gcc -o vwebp vwebp.c -lwebp -lwebpmux -framework GLUT -framework OpenGL
// //
// Author: Skal (pascal.massimino@gmail.com) // Author: Skal (pascal.massimino@gmail.com)
@ -20,6 +20,7 @@
#include <string.h> #include <string.h>
#include "webp/decode.h" #include "webp/decode.h"
#include "webp/mux.h"
#ifdef __APPLE__ #ifdef __APPLE__
#include <GLUT/glut.h> #include <GLUT/glut.h>
@ -34,10 +35,51 @@
#define snprintf _snprintf #define snprintf _snprintf
#endif #endif
// Unfortunate global variables static void Help(void);
static const WebPDecBuffer* kPic = NULL;
static const char* file_name = NULL; // Unfortunate global variables. Gathered into a struct for comfort.
static int print_info = 0; static struct {
int has_animation;
int done;
int decoding_error;
int print_info;
uint32_t flags;
uint32_t loop_count;
int frame_num;
int frame_max;
const char* file_name;
WebPData data;
WebPMux* mux;
WebPDecoderConfig* config;
const WebPDecBuffer* pic;
} kParams = {
0, 0, 0, 0, // has_animation, ...
0, 1, 1, 0, // flags, ...
NULL, { NULL, 0 }, // file_name, ...
NULL, NULL, NULL // mux, ...
};
static void ClearPreviousPic(void) {
WebPFreeDecBuffer((WebPDecBuffer*)kParams.pic);
kParams.pic = NULL;
}
static void ClearData(WebPData* data) {
if (data != NULL) {
free((void*)data->bytes_);
data->bytes_ = NULL;
data->size_ = 0;
}
}
static void ClearParams(void) {
ClearPreviousPic();
ClearData(&kParams.data);
WebPMuxDelete(kParams.mux);
kParams.mux = NULL;
}
//------------------------------------------------------------------------------ //------------------------------------------------------------------------------
// Callbacks // Callbacks
@ -49,12 +91,11 @@ static void HandleKey(unsigned char key, int pos_x, int pos_y) {
#ifdef FREEGLUT #ifdef FREEGLUT
glutLeaveMainLoop(); glutLeaveMainLoop();
#else #else
WebPFreeDecBuffer((WebPDecBuffer*)kPic); ClearParams();
kPic = NULL;
exit(0); exit(0);
#endif #endif
} else if (key == 'i') { } else if (key == 'i') {
print_info = 1 - print_info; kParams.print_info = 1 - kParams.print_info;
glutPostRedisplay(); glutPostRedisplay();
} }
} }
@ -78,23 +119,25 @@ static void PrintString(const char* const text) {
} }
static void HandleDisplay(void) { static void HandleDisplay(void) {
if (kPic == NULL) return; const WebPDecBuffer* pic = kParams.pic;
if (pic == NULL) return;
glClear(GL_COLOR_BUFFER_BIT); glClear(GL_COLOR_BUFFER_BIT);
glPushMatrix(); glPushMatrix();
glPixelZoom(1, -1); glPixelZoom(1, -1);
glRasterPos2f(-1, 1); glRasterPos2f(-1, 1);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1); glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glPixelStorei(GL_UNPACK_ROW_LENGTH, kPic->u.RGBA.stride / 4); glPixelStorei(GL_UNPACK_ROW_LENGTH, pic->u.RGBA.stride / 4);
glDrawPixels(kPic->width, kPic->height, GL_RGBA, GL_UNSIGNED_BYTE, glDrawPixels(pic->width, pic->height,
(GLvoid*)kPic->u.RGBA.rgba); GL_RGBA, GL_UNSIGNED_BYTE,
if (print_info) { (GLvoid*)pic->u.RGBA.rgba);
if (kParams.print_info) {
char tmp[32]; char tmp[32];
glColor4f(0.0, 0.0, 0.0, 0.0); glColor4f(0.0, 0.0, 0.0, 0.0);
glRasterPos2f(-0.95f, 0.90f); glRasterPos2f(-0.95f, 0.90f);
PrintString(file_name); PrintString(kParams.file_name);
snprintf(tmp, sizeof(tmp), "Dimension:%d x %d", kPic->width, kPic->height); snprintf(tmp, sizeof(tmp), "Dimension:%d x %d", pic->width, pic->height);
glColor4f(0.0, 0.0, 0.0, 0.0); glColor4f(0.0, 0.0, 0.0, 0.0);
glRasterPos2f(-0.95f, 0.80f); glRasterPos2f(-0.95f, 0.80f);
PrintString(tmp); PrintString(tmp);
@ -102,38 +145,35 @@ static void HandleDisplay(void) {
glFlush(); glFlush();
} }
static void Show(const WebPDecBuffer* const pic) { static void StartDisplay(const WebPDecBuffer* const pic) {
glutInitDisplayMode(GLUT_RGBA); glutInitDisplayMode(GLUT_RGBA);
glutInitWindowSize(pic->width, pic->height); glutInitWindowSize(pic->width, pic->height);
glutCreateWindow("WebP viewer"); glutCreateWindow("WebP viewer");
glutReshapeFunc(HandleReshape);
glutDisplayFunc(HandleDisplay); glutDisplayFunc(HandleDisplay);
glutIdleFunc(NULL); glutIdleFunc(NULL);
glutKeyboardFunc(HandleKey); glutKeyboardFunc(HandleKey);
glClearColor(0.0, 0.0, 0.0, 0.0); glClearColor(0.0, 0.0, 0.0, 0.0);
HandleReshape(pic->width, pic->height); HandleReshape(pic->width, pic->height);
glutMainLoop();
} }
//------------------------------------------------------------------------------ //------------------------------------------------------------------------------
// File decoding // File decoding
static const char* const kStatusMessages[] = { static int ReadFile(void) {
"OK", "OUT_OF_MEMORY", "INVALID_PARAM", "BITSTREAM_ERROR",
"UNSUPPORTED_FEATURE", "SUSPENDED", "USER_ABORT", "NOT_ENOUGH_DATA"
};
static int Decode(const char* const in_file, WebPDecoderConfig* const config) {
WebPDecBuffer* const output_buffer = &config->output;
WebPBitstreamFeatures* const bitstream = &config->input;
VP8StatusCode status = VP8_STATUS_OK;
int ok; int ok;
size_t data_size = 0;
void* data = NULL; void* data = NULL;
FILE* const in = fopen(in_file, "rb"); size_t data_size = 0;
const char* const file_name = kParams.file_name;
FILE* in = NULL;
if (!in) { if (file_name == NULL) {
fprintf(stderr, "cannot open input file '%s'\n", in_file); printf("missing input file!!\n");
Help();
return 0;
}
in = fopen(file_name, "rb");
if (in == NULL) {
fprintf(stderr, "cannot open input file '%s'\n", file_name);
return 0; return 0;
} }
fseek(in, 0, SEEK_END); fseek(in, 0, SEEK_END);
@ -143,31 +183,73 @@ static int Decode(const char* const in_file, WebPDecoderConfig* const config) {
if (data == NULL) return 0; if (data == NULL) return 0;
ok = (fread(data, data_size, 1, in) == 1); ok = (fread(data, data_size, 1, in) == 1);
fclose(in); fclose(in);
kParams.data.bytes_ = data;
kParams.data.size_ = data_size;
if (!ok) { if (!ok) {
fprintf(stderr, "Could not read %zu bytes of data from file %s\n", fprintf(stderr, "Could not read %zu bytes of data from file %s\n",
data_size, in_file); data_size, file_name);
free(data);
return 0; return 0;
} }
return 1;
}
status = WebPGetFeatures((const uint8_t*)data, data_size, bitstream); static int Decode(const int frame_number, uint32_t* const duration) {
if (status != VP8_STATUS_OK) { WebPDecoderConfig* const config = kParams.config;
goto end; WebPData *data, image_data;
uint32_t x_off = 0, y_off = 0;
WebPDecBuffer* const output_buffer = &config->output;
int ok = 0;
ClearPreviousPic();
if (kParams.has_animation) {
if (WebPMuxGetFrame(kParams.mux, frame_number, &image_data, NULL,
&x_off, &y_off, duration) != WEBP_MUX_OK) {
goto end;
}
if (x_off != 0 || y_off != 0) {
fprintf(stderr,
"Tiling and offsets not yet supported! Forcing offset to 0,0\n");
x_off = y_off = 0;
}
data = &image_data;
} else {
data = &kParams.data;
} }
output_buffer->colorspace = MODE_RGBA; output_buffer->colorspace = MODE_RGBA;
status = WebPDecode((const uint8_t*)data, data_size, config); ok = (WebPDecode(data->bytes_, data->size_, config) == VP8_STATUS_OK);
end: end:
free(data);
ok = (status == VP8_STATUS_OK);
if (!ok) { if (!ok) {
fprintf(stderr, "Decoding of %s failed.\n", in_file); fprintf(stderr, "Decoding of frame #%d failed!\n", frame_number);
fprintf(stderr, "Status: %d (%s)\n", status, kStatusMessages[status]); } else {
kParams.pic = output_buffer;
} }
return ok; return ok;
} }
static void decode_callback(int what) {
if (what == 0 && !kParams.done) {
uint32_t duration = 0;
if (kParams.mux != NULL) {
if (!Decode(kParams.frame_num, &duration)) {
kParams.decoding_error = 1;
kParams.done = 1;
} else {
++kParams.frame_num;
if (kParams.frame_num > kParams.frame_max) {
kParams.frame_num = 1;
--kParams.loop_count;
kParams.done = (kParams.loop_count == 0);
}
}
}
glutPostRedisplay();
glutTimerFunc(duration, decode_callback, what);
}
}
//------------------------------------------------------------------------------ //------------------------------------------------------------------------------
// Main // Main
@ -187,12 +269,14 @@ static void Help(void) {
int main(int argc, char *argv[]) { int main(int argc, char *argv[]) {
WebPDecoderConfig config; WebPDecoderConfig config;
WebPMuxError mux_err;
int c; int c;
if (!WebPInitDecoderConfig(&config)) { if (!WebPInitDecoderConfig(&config)) {
fprintf(stderr, "Library version mismatch!\n"); fprintf(stderr, "Library version mismatch!\n");
return -1; return -1;
} }
kParams.config = &config;
for (c = 1; c < argc; ++c) { for (c = 1; c < argc; ++c) {
if (!strcmp(argv[c], "-h") || !strcmp(argv[c], "-help")) { if (!strcmp(argv[c], "-h") || !strcmp(argv[c], "-help")) {
@ -224,29 +308,63 @@ int main(int argc, char *argv[]) {
Help(); Help();
return -1; return -1;
} else { } else {
file_name = argv[c]; kParams.file_name = argv[c];
} }
} }
if (file_name == NULL) { if (!ReadFile()) goto Error;
printf("missing input file!!\n");
Help(); kParams.mux =
return -1; WebPMuxCreate(kParams.data.bytes_, kParams.data.size_, 0, NULL);
} if (kParams.mux == NULL) {
if (!Decode(file_name, &config)) { fprintf(stderr, "Could not create demuxing object!\n");
return -1; goto Error;
} }
kPic = &config.output; mux_err = WebPMuxGetFeatures(kParams.mux, &kParams.flags);
printf("Displaying [%s]: %d x %d. Press Esc to exit, 'i' for info.\n", if (mux_err != WEBP_MUX_OK) {
file_name, kPic->width, kPic->height); goto Error;
}
if (kParams.flags & TILE_FLAG) {
fprintf(stderr, "Tiling is not supported for now!\n");
goto Error;
}
kParams.has_animation = !!(kParams.flags & ANIMATION_FLAG);
if (kParams.has_animation) {
mux_err = WebPMuxGetLoopCount(kParams.mux, &kParams.loop_count);
if (mux_err != WEBP_MUX_OK && mux_err != WEBP_MUX_NOT_FOUND) {
goto Error;
}
mux_err = WebPMuxNumNamedElements(kParams.mux, "image",
&kParams.frame_max);
if (mux_err != WEBP_MUX_OK && mux_err != WEBP_MUX_NOT_FOUND) {
goto Error;
}
printf("VP8X: Found %d images in file (loop count = %d)\n",
kParams.frame_max, kParams.loop_count);
}
// Decode first frame
{
uint32_t duration;
if (!Decode(1, &duration)) goto Error;
}
// Start display (and timer)
glutInit(&argc, argv); glutInit(&argc, argv);
Show(kPic); StartDisplay(kParams.pic);
if (kParams.has_animation) glutTimerFunc(0, decode_callback, 0);
glutMainLoop();
// Should only be reached when using FREEGLUT: // Should only be reached when using FREEGLUT:
WebPFreeDecBuffer(&config.output); ClearParams();
return 0; return 0;
Error:
ClearParams();
return -1;
} }
//------------------------------------------------------------------------------ //------------------------------------------------------------------------------