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jpeg: Add open_memory support

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This commit is contained in:
Harry Jeffery 2019-01-31 21:45:59 +00:00
parent 6b639fe19b
commit 0f1f32a149
1 changed files with 46 additions and 2 deletions
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48
src/backend_libjpeg.c
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@ -26,9 +26,13 @@ static void source_free(struct imv_source *src)
struct private *private = src->private;
tjDestroy(private->jpeg);
munmap(private->data, private->len);
if (private->fd >= 0) {
munmap(private->data, private->len);
close(private->fd);
} else {
free(private->data);
}
private->data = NULL;
close(private->fd);
free(src->private);
src->private = NULL;
@ -156,6 +160,45 @@ static enum backend_result open_path(const char *path, struct imv_source **src)
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(struct imv_source));
source->name = strdup("-");
source->width = width;
source->height = height;
source->num_frames = 1;
source->next_frame = 1;
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 libjpeg_backend = {
.name = "libjpeg-turbo",
.description = "Fast JPEG codec based on libjpeg. "
@ -164,6 +207,7 @@ const struct imv_backend libjpeg_backend = {
.website = "https://libjpeg-turbo.org/",
.license = "The Modified BSD License",
.open_path = &open_path,
.open_memory = &open_memory,
};
const struct imv_backend *imv_backend_libjpeg(void)