Take snapshot from running pipeline in gstreamer with iOS

[Macjon]

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;
}



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