Android 6.0 gstreamer 1.0: frame is not writable

[Olivier Crête]

Hi,

What is your pipeline? Where are you putting the probe in it?

Olivier

On Wed, 2015-11-25 at 12:01 -0800, Gregoire Gentil wrote:
> Hello,
> 
> On a Nexus5X with Android 6.0 Marshmallow, a frame accessed through a
> pad probe is not writable. The same code works on a Nexus 7 2013 5.x.
> My 
> code is the following:
> 
> gst_pad_add_probe(pad, GST_PAD_PROBE_TYPE_BUFFER, 
> (GstPadProbeCallback)cb, NULL, NULL);
> 
> static GstPadProbeReturn cb(GstPad *pad, GstPadProbeInfo *info, 
> CustomData *data) {
> GstBuffer *buffer = gst_pad_probe_info_get_buffer(info);
> GstMapInfo map;
> gst_buffer_map(buffer, &map, GST_MAP_WRITE | GST_MAP_READ);
> guint8 *frameIn = (guint8 *)map.data;
> ...
> }
> 
> and I get the following warning (before a crash when writing to the
> frame):
> 
> 11-25 11:58:14.830: W/GStreamer+default(5277): 0:00:06.511757706 
> 0xdb0f1320 gstbuffer.c:1613:gst_buffer_map_range:<0xf41fcf40> write
> map 
> requested on non-writable buffer
> 
> Any idea what's wrong? Thanks in advance,
> 
> Grégoire
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-- 
Olivier Crête
olivier.crete at collabora.com