mmal/codec: Try to apply fmt changes without disabling port

Depending on what parts of the format have changed it can be possible to apply
the changes without resetting the whole port. As this saves some time try to
make use of it.
Signed-off-by: Julian Scheel <julian@jusst.de>
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/hw/mmal/codec.c

@@ -290,6 +290,20 @@ static int change_output_format(decoder_t *dec)
     int pool_size;
     int ret = 0;
 
+    if (sys->output_pool) {
+        mmal_format_full_copy(sys->output->format, sys->output_format);
+        status = mmal_port_format_commit(sys->output);
+        if (status != MMAL_SUCCESS) {
+            msg_Err(dec, "Failed to commit output format (status=%"PRIx32" %s)",
+                    status, mmal_status_to_string(status));
+            ret = -1;
+            goto port_reset;
+        }
+        goto apply_fmt;
+    }
+
+port_reset:
+    msg_Dbg(dec, "%s: Do full port reset", __func__);
     status = mmal_port_disable(sys->output);
     if (status != MMAL_SUCCESS) {
         msg_Err(dec, "Failed to disable output port (status=%"PRIx32" %s)",
@@ -344,6 +358,7 @@ static int change_output_format(decoder_t *dec)
         msg_Dbg(dec, "Request %d extra pictures", dec->i_extra_picture_buffers);
     }
 
+apply_fmt:
     dec->fmt_out.video.i_width = sys->output->format->es->video.width;
     dec->fmt_out.video.i_height = sys->output->format->es->video.height;
     dec->fmt_out.video.i_x_offset = sys->output->format->es->video.crop.x;