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#include "backend.h"
#include "source.h"
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/mman.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <turbojpeg.h>
struct private {
int fd;
void *data;
size_t len;
tjhandle jpeg;
};
static void source_free(struct imv_source *src)
{
pthread_mutex_lock(&src->busy);
free(src->name);
src->name = NULL;
struct private *private = src->private;
tjDestroy(private->jpeg);
if (private->fd >= 0) {
munmap(private->data, private->len);
close(private->fd);
} else {
free(private->data);
}
private->data = NULL;
free(src->private);
src->private = NULL;
pthread_mutex_unlock(&src->busy);
pthread_mutex_destroy(&src->busy);
free(src);
}
static struct imv_image *to_image(int width, int height, void *bitmap)
{
struct imv_bitmap *bmp = malloc(sizeof *bmp);
bmp->width = width;
bmp->height = height;
bmp->format = IMV_ABGR;
bmp->data = bitmap;
struct imv_image *image = imv_image_create_from_bitmap(bmp);
return image;
}
static void report_error(struct imv_source *src)
{
assert(src->callback);
struct imv_source_message msg;
msg.source = src;
msg.user_data = src->user_data;
msg.image = NULL;
msg.error = "Internal error";
pthread_mutex_unlock(&src->busy);
src->callback(&msg);
}
static void send_bitmap(struct imv_source *src, void *bitmap)
{
assert(src->callback);
struct imv_source_message msg;
msg.source = src;
msg.user_data = src->user_data;
msg.image = to_image(src->width, src->height, bitmap);
msg.frametime = 0;
msg.error = NULL;
pthread_mutex_unlock(&src->busy);
src->callback(&msg);
}
static void *load_image(struct imv_source *src)
{
/* Don't run if this source is already active */
if (pthread_mutex_trylock(&src->busy)) {
return NULL;
}
struct private *private = src->private;
void *bitmap = malloc(src->height * src->width * 4);
int rcode = tjDecompress2(private->jpeg, private->data, private->len,
bitmap, src->width, 0, src->height, TJPF_RGBA, TJFLAG_FASTDCT);
if (rcode) {
free(bitmap);
report_error(src);
return NULL;
}
send_bitmap(src, bitmap);
return NULL;
}
static enum backend_result open_path(const char *path, struct imv_source **src)
{
struct private private;
private.fd = open(path, O_RDONLY);
if (private.fd < 0) {
return BACKEND_BAD_PATH;
}
off_t len = lseek(private.fd, 0, SEEK_END);
if (len < 0) {
close(private.fd);
return BACKEND_BAD_PATH;
}
private.len = len;
private.data = mmap(NULL, private.len, PROT_READ, MAP_PRIVATE, private.fd, 0);
if (private.data == MAP_FAILED || !private.data) {
close(private.fd);
return BACKEND_BAD_PATH;
}
private.jpeg = tjInitDecompress();
if (!private.jpeg) {
munmap(private.data, private.len);
close(private.fd);
return BACKEND_UNSUPPORTED;
}
int width, height;
int rcode = tjDecompressHeader(private.jpeg, private.data, private.len,
&width, &height);
if (rcode) {
tjDestroy(private.jpeg);
munmap(private.data, private.len);
close(private.fd);
return BACKEND_UNSUPPORTED;
}
struct imv_source *source = calloc(1, sizeof *source);
source->name = strdup(path);
source->width = width;
source->height = height;
source->num_frames = 1;
source->next_frame = 1;
pthread_mutex_init(&source->busy, NULL);
source->load_first_frame = &load_image;
source->load_next_frame = NULL;
source->free = &source_free;
source->callback = NULL;
source->user_data = NULL;
source->private = malloc(sizeof private);
memcpy(source->private, &private, sizeof private);
*src = source;
return BACKEND_SUCCESS;
}
static enum backend_result open_memory(void *data, size_t len, struct imv_source **src)
{
struct private private;
private.fd = -1;
private.data = data;
private.len = len;
private.jpeg = tjInitDecompress();
if (!private.jpeg) {
return BACKEND_UNSUPPORTED;
}
int width, height;
int rcode = tjDecompressHeader(private.jpeg, private.data, private.len,
&width, &height);
if (rcode) {
tjDestroy(private.jpeg);
return BACKEND_UNSUPPORTED;
}
struct imv_source *source = calloc(1, sizeof *source);
source->name = strdup("-");
source->width = width;
source->height = height;
source->num_frames = 1;
source->next_frame = 1;
pthread_mutex_init(&source->busy, NULL);
source->load_first_frame = &load_image;
source->load_next_frame = NULL;
source->free = &source_free;
source->callback = NULL;
source->user_data = NULL;
source->private = malloc(sizeof private);
memcpy(source->private, &private, sizeof private);
*src = source;
return BACKEND_SUCCESS;
}
const struct imv_backend imv_backend_libjpeg = {
.name = "libjpeg-turbo",
.description = "Fast JPEG codec based on libjpeg. "
"This software is based in part on the work "
"of the Independent JPEG Group.",
.website = "https://libjpeg-turbo.org/",
.license = "The Modified BSD License",
.open_path = &open_path,
.open_memory = &open_memory,
};
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