[Bug 736100] video-info: doesn't return the right I420 image size for certain resolutions

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=736100
  GStreamer | gst-plugins-base | git

--- Comment #4 from Aleix Conchillo Flaqué <aconchillo at gmail.com> 2014-09-06 18:54:34 UTC ---
In case anyone else needs this. This is what I end up doing which fixes the
problem.

-----

static void
WebRtcI420ToGStreamer (guint8 *dst, guint8 *src, gint width, gint height)
{
  GstVideoInfo info;

  gst_video_info_init (&info);
  gst_video_info_set_format (&info, GST_VIDEO_FORMAT_I420, width, height);

  guint src_y_stride = width;
  guint src_u_stride = (width + 1) / 2;
  guint src_v_stride = (width + 1) / 2;

  guint dst_y_stride = GST_VIDEO_INFO_COMP_STRIDE (&info, 0);
  guint dst_u_stride = GST_VIDEO_INFO_COMP_STRIDE (&info, 1);
  guint dst_v_stride = GST_VIDEO_INFO_COMP_STRIDE (&info, 2);

  // Y
  for (guint h = 0; h < height; h++)
    { memcpy (dst, src, src_y_stride);
      dst += dst_y_stride;
      src += src_y_stride;
    }
  // U
  for (guint h = 0; h < height / 2; h++)
    { memcpy (dst, src, src_u_stride);
      dst += dst_u_stride;
      src += src_u_stride;
    }
  // V
  for (guint h = 0; h < height / 2; h++)
    { memcpy (dst, src, src_v_stride);
      dst += dst_v_stride;
      src += src_v_stride;
    }
}

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