Well, it seems that this problem mostly occurs when the sdcard is mounted
directly, which means that we actually have access to the raw file.
2012/11/25 johannes hanika <[email protected]>
> the problem is you don't have the raw file. it's on the camera and now
> you have to talk to gphoto.
>
> On Mon, Nov 26, 2012 at 11:00 AM, Mattias Eriksson <[email protected]>
> wrote:
> > I realize that the import was modified to use the embedded raw
> thumbnails,
> > and looking at the import code I find this:
> > int ret;
> > libraw_data_t *raw = libraw_init(0);
> > libraw_processed_image_t *image = NULL;
> > ret = libraw_open_file(raw, filename);
> > if(ret) goto libraw_fail;
> > ret = libraw_unpack_thumb(raw);
> > if(ret) goto libraw_fail;
> >
> > I assume that this code will unpack the thumbnail from the raw file,
> without
> > reading the whole file. So maybe something similar could be used in the
> > import dialog for the case when gphoto doesn't provide a preview and the
> > file is a raw file?
> >
> >
> > 2012/11/25 Mattias Eriksson <[email protected]>
> >>
> >> When I'm thinking about this, I guess gphoto2 is the wrong place for
> >> something like this since it handles the transport and not parsing of
> raw
> >> files. I guess the raw library should be extended (if it doesn't already
> >> have it) with a function to read the embeded thumbnails with as little
> >> overhead as possible? Does that sound like the right way to solve this?
> It
> >> would be good to hear from the RAW specialists about how to handle this.
> >>
> >> //Snaggen
> >>
> >>
> >>
> >> 2012/11/25 Mattias Eriksson <[email protected]>
> >>>
> >>> >From what I understand it is this code passage in the file
> >>> common/camera_control.c that handles the previews. So the situation as
> I
> >>> understand it is that when we connect the camera directly, the gphoto
> >>> library is served a preview by the camera. But when we connect the
> sdcard
> >>> gphoto will not have a preview version of the image and the file size
> of my
> >>> raw files is larger than 512000 bytes. But since NEF files actually
> have a
> >>> preview embeded it might be possible to read this without reading the
> whole
> >>> file? But maybe that should be inside gphoto2? Does anyone have any
> >>> knowledge about that library?
> >>>
> >>> /*
> >>> * Fetch image preview if flagged...
> >>> */
> >>> if( flags & CAMCTL_IMAGE_PREVIEW_DATA )
> >>> {
> >>> gp_file_new(&preview);
> >>> if( gp_camera_file_get(c->active_camera->gpcam, path,
> filename,
> >>> GP_FILE_TYPE_PREVIEW,preview,c->gpcontext) < GP_OK )
> >>> {
> >>> // No preview for file lets check image size to se if we
> >>> should download full image for preview...
> >>> if( cfi.file.size > 0 && cfi.file.size < 512000 )
> >>> if( gp_camera_file_get(c->active_camera->gpcam, path,
> >>> filename, GP_FILE_TYPE_NORMAL,preview,c->gpcontext) < GP_OK )
> >>> {
> >>> preview=NULL;
> >>> dt_print(DT_DEBUG_CAMCTL,"[camera_control] failed to
> >>> retreive preview of file %s\n",filename);
> >>> }
> >>> }
> >>> }
> >>>
> >>>
> >>> //Snaggen
> >>
> >>
> >
> >
> >
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