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void
p_example_read_video(char *videofile, gdouble skip_seconds, gint32 nframes)
{
t_GVA_Handle* gvahand;
gint32 vid_track;
gint32 aud_track;
vid_track = 1; aud_track = 1;
gvahand = GVA_open_read(videofile, vid_track, aud_track);
if(gvahand)
{
t_GVA_RetCode l_rc;
gint32 framenumber;
GimpRunMode runmode;
/* print informations about the videofile */
printf("Videofile : %s\n", videofile);
printf(" framesize : %d x %d\n", (int)gvahand->width, (int)gvahand->width );
printf(" # of frames : %d\n", (int)gvahand->total_frames );
printf(" framerate : %f (f/sec)\n", (float)gvahand->framerate );
printf("Decoder Name : %s\n", gvahand->dec_elem->decoder_name);
runmode = GIMP_RUN_INTERACTIVE;
if (skip_seconds > 0.0)
{
/* skip the the trailer (time in seconds) */
l_rc = GVA_seek_frame(gvahand, skip_seconds, GVA_UPOS_SECS);
}
/* read nframes from the video */
for(framenumber=1; framenumber <= nframes; framenumber++)
{
gboolean delete_mode = TRUE;
gint32 deinterlace; /* 0.. NO deinterlace, 1..odd rows, 2..even rows */
gdouble threshold; /* 0.0 <= threshold <= 1.0 */
char *framename;
deinterlace = 1;
/* threshold for interpolated rows (only used if deinterlace != 0)
* - big thresholds 1.0 do smooth mix interpolation
* - small thresholds keep hard edges (does not mix different colors)
* - threshold 0.0 does not interpolate at all and just makes a copy of the previous row
*/
threshold = 1.0;
/* fetch one frame to buffer gvahand->frame_data
* (and proceed position to next frame)
*/
l_rc = GVA_get_next_frame(gvahand);
if(l_rc == GVA_RET_OK)
{
/* convert fetched frame from buffer to gimp image gvahand->image_id
* by creating a new layer gvahand->layer_id
* delete_mode TRUE does first delete gvahand->layer_id
* (delete_mode FALSE would not delete the layer and the layerstack would
* grow upto full nframes Layers in the last turn of the loop)
*/
l_rc = GVA_frame_to_gimp_layer(gvahand, delete_mode, framenumber, deinterlace, threshold);
/* save the extracted frames using gimp_file_save
* (the fileformat is selected automatically by the extension)
*/
framename = g_strdup_printf("frame_%04d.jpg");
printf ("saving: %s\n", framename);
gimp_file_save(runmode, gvahand->image_id, gvahand->layer_id, framename, framename);
g_free(framename);
/* foreach following frame use the same save settings (same jpeg quality)
* as given by the User in the 1.st INTERACTIVE Run
*/
runmode = GIMP_RUN_WITH_LAST_VALS;
}
}
GVA_close(gvahand);
}
} /* end p_example_read_video */
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