Take snapshot from running pipeline in gstreamer with iOS

[Ruben Gonzalez]

Hi all

I have written a simple snippet in C to take a snapshot from running
pipeline and test gst_video_convert_sample [1]. IMHO take snapshot should
be a must inside GStreamer and a function like
gst_video_write_sample_to_file would be a good idea.

Looking inside gst_video_convert_sample and gst_play_sink_convert_sample,
coding gst_video_write_sample_to_file should be easy using a filesink. If
these feature is useful for the community, let me know it and I could try
to do it.

[1] https://github.com/rubenrua/GstreamerCodeSnippets/blob/
master/C/takepic.c

2016-08-17 12:47 GMT+02:00 Macjon <jonah.hulselmans at flowpilots.com>:

> I've got a peace of code that works. I removed the tee from my pipeline.
> And
> now I have the following objective-c code:
>
> -(UIImage*) takeSnapshot
> {
>     GstSample *videobuffer = NULL;
>     GstCaps *caps;
>     gint width, height;
>     GstMapInfo map;
>
>     g_object_get(G_OBJECT(video_sink), "last-sample", &videobuffer, NULL);
>
>     if (videobuffer)
>     {
>         caps = gst_sample_get_caps(videobuffer);
>
>         if (!caps) {
>             return NULL;
>         }
>
>         GstStructure *s = gst_caps_get_structure(caps, 0);
>         /* we need to get the final caps on the buffer to get the size */
>         gboolean res;
>         res = gst_structure_get_int (s, "width", &width);
>         res |= gst_structure_get_int (s, "height", &height);
>         if (!res) {
>             return NULL;
>         }
>
>         GstBuffer *snapbuffer = gst_sample_get_buffer(videobuffer);
>         if (snapbuffer && gst_buffer_map (snapbuffer, &map, GST_MAP_READ))
>         {
>             CGDataProviderRef provider = CGDataProviderCreateWithData(
> NULL,
>                                                                   map.data,
>                                                                   height *
> width * 4,
>                                                                   NULL);
>
>             CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();
>             CGBitmapInfo bitmapInfo = kCGBitmapByteOrderDefault;
>             CGColorRenderingIntent renderingIntent =
> kCGRenderingIntentDefault;
>
>             CGImageRef imageRef = CGImageCreate(width,
>                                             height,
>                                             8,
>                                             4 * 8,
>                                             width * 4,
>                                             colorSpaceRef,
>                                             bitmapInfo,
>                                             provider,
>                                             NULL,
>                                             NO,
>                                             renderingIntent);
>
>             UIImage *uiImage = [UIImage imageWithCGImage:imageRef];
>             CGColorSpaceRelease(colorSpaceRef);
>             CGImageRelease(imageRef);
>
>             return uiImage;
>         }
>
>         return NULL;
>     }
>
>     return NULL;
> }
>
>
>
> --
> View this message in context: http://gstreamer-devel.966125.
> n4.nabble.com/Take-snapshot-from-running-pipeline-in-gstreamer-with-iOS-
> tp4678410p4679126.html
> Sent from the GStreamer-devel mailing list archive at Nabble.com.
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>



-- 
Best regards/Un Saludo

Ruben Gonzalez Gonzalez
TELTEK Video Research
http://teltek.es/




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