Hi,
I've been trying to modify the epeg library to accept raw rgb images
for a robot project i'm involved in. Basicaly I'm feeding data
straight from a webcam to the epeg lib for fast conversion to jpeg,
all in memory.
I got the source and added a function to create an Epeg_Image to load
the raw data into so I could skip the decode and scale phases in the
epeg_encode() function
I also exposed the _epeg_encode function so that I could access it directly.
So... My problem is that I can´t complete the encode function it
crashes while trying to iterate through the image lines.
... from _epeg_encode()
while (im->out.jinfo.next_scanline < im->out.h)
jpeg_write_scanlines(&(im->out.jinfo),
&(im->lines[im->out.jinfo.next_scanline]), 1);
...
it crashes in the third pass (gdb recived a SIGKILL)
the function that creates the Epeg_Image struct looks like this:
Epeg_Image* epeg_create_rgb_image(int width, int height, unsigned char* data)
{
Epeg_Image *im;
im = calloc(1, sizeof(Epeg_Image));
// set file to null or empty
im->in.file = NULL;
im->in.f = NULL;
im->in.comment = NULL;
im->out.comment = NULL;
im->out.thumbnail_info = 0;
im->out.f = NULL;
im->out.file = NULL;
im->in.jinfo.scale_num = 1;
im->in.jinfo.scale_denom = 1;
im->in.jinfo.do_fancy_upsampling = FALSE;
im->in.jinfo.do_block_smoothing = FALSE;
im->in.jinfo.out_color_space = JCS_RGB;
im->in.jinfo.output_components = 3;
im->out.h = height;
im->out.w = width;
im->out.quality = 75;
im->color_space = EPEG_RGB8;
unsigned char* p;
p = data;
im->pixels = p;
if (!im->pixels)
return NULL;
im->lines = malloc(height * sizeof(char *));
if (!im->lines)
return NULL;
return im;
}
I'm certain that the source of my problems lies in this function and
how I configure the jpeg structs. If someone can see what I'm missing
I'd be very grateful.
I would us this like this:
unsigned char* data;
int size;
unsigned char** output;
int out_size;
readCamera(data, size); // unimportant how this function works
Epeg_Image* im = epeg_create_rgb_image(352, 288, data);
epeg_encode_raw(im); // calls the _epeg_encode() function
epeg_memory_output_set(output, size);
epeg_close();
Thanks for your time,
regards,
Freyr
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