/* Pinos
 * Copyright (C) 2015 Wim Taymans <wim.taymans@gmail.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include <string.h>

#include <gst/gst.h>
#include <gio/gio.h>

#include "pinos/server/utils.h"

GBytes *
pinos_format_filter (GBytes *format,
                     GBytes *filter,
                     GError **error)
{
  GstCaps *tmp, *caps, *cfilter;
  gchar *str;
  GBytes *res;

  if (filter) {
    cfilter = gst_caps_from_string (g_bytes_get_data (filter, NULL));
    if (cfilter == NULL)
      goto invalid_filter;
  } else {
    cfilter = NULL;
  }

  if (format)
    caps = gst_caps_from_string (g_bytes_get_data (format, NULL));
  else
    caps = gst_caps_new_any ();

  if (caps && cfilter) {
    tmp = gst_caps_intersect_full (caps, cfilter, GST_CAPS_INTERSECT_FIRST);
    gst_caps_take (&caps, tmp);
  }
  g_clear_pointer (&cfilter, gst_caps_unref);

  if (caps == NULL || gst_caps_is_empty (caps))
    goto no_format;

  str = gst_caps_to_string (caps);
  gst_caps_unref (caps);
  res = g_bytes_new_take (str, strlen (str) + 1);

  return res;

invalid_filter:
  {
    g_set_error (error,
                 G_IO_ERROR,
                 G_IO_ERROR_INVALID_ARGUMENT,
                 "Invalid filter received");
    return NULL;
  }
no_format:
  {
    g_set_error (error,
                 G_IO_ERROR,
                 G_IO_ERROR_NOT_FOUND,
                 "No compatible format found");
    if (cfilter)
      gst_caps_unref (cfilter);
    if (caps)
      gst_caps_unref (caps);
    return NULL;
  }
}