/*
 *  output.c - Video output helpers
 *
 *  Copyright (C) 2012 Intel Corporation
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public License
 *  as published by the Free Software Foundation; either version 2.1
 *  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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free
 *  Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 *  Boston, MA 02110-1301 USA
 */

#include "config.h"
#include <string.h>
#include <gst/gst.h>
#if USE_X11
# include <gst/vaapi/gstvaapidisplay_x11.h>
# include <gst/vaapi/gstvaapiwindow_x11.h>
#endif
#if USE_GLX
# include <gst/vaapi/gstvaapidisplay_glx.h>
# include <gst/vaapi/gstvaapiwindow_glx.h>
#endif
#if USE_WAYLAND
# include <gst/vaapi/gstvaapidisplay_wayland.h>
# include <gst/vaapi/gstvaapiwindow_wayland.h>
#endif
#include "output.h"

static const VideoOutputInfo *g_video_output;
static const VideoOutputInfo g_video_outputs[] = {
    /* Video outputs are sorted in test order for automatic characterisation */
#if USE_WAYLAND
    { "wayland",
      gst_vaapi_display_wayland_new,
      gst_vaapi_window_wayland_new
    },
#endif
#if USE_X11
    { "x11",
      gst_vaapi_display_x11_new,
      gst_vaapi_window_x11_new
    },
#endif
#if USE_GLX
    { "glx",
      gst_vaapi_display_glx_new,
      gst_vaapi_window_glx_new
    },
#endif
    { NULL, }
};

static gchar *g_output_name;
static gboolean g_list_outputs = FALSE;

static GOptionEntry g_options[] = {
    { "list-outputs", 0,
      0,
      G_OPTION_ARG_NONE, &g_list_outputs,
      "list video outputs", NULL },
    { "output", 'o',
      0,
      G_OPTION_ARG_STRING, &g_output_name,
      "video output name", NULL },
    { NULL, }
};

static void
list_outputs(void)
{
    const VideoOutputInfo *o;

    g_print("Video outputs:");
    for (o = g_video_outputs; o->name != NULL; o++)
        g_print(" %s", o->name);
    g_print("\n");
}

gboolean
video_output_init(int *argc, char *argv[], GOptionEntry *options)
{
    GOptionContext *ctx;
    gboolean success;

#if !GLIB_CHECK_VERSION(2,31,0)
    if (!g_thread_supported())
        g_thread_init(NULL);
#endif

    ctx = g_option_context_new("- test options");
    if (!ctx)
        return FALSE;

    g_option_context_add_group(ctx, gst_init_get_option_group());
    g_option_context_add_main_entries(ctx, g_options, NULL);
    if (options)
        g_option_context_add_main_entries(ctx, options, NULL);
    success = g_option_context_parse(ctx, argc, &argv, NULL);
    g_option_context_free(ctx);

    if (g_list_outputs) {
        list_outputs();
        exit(0);
    }
    return success;
}

void
video_output_exit(void)
{
    g_free(g_output_name);
    gst_deinit();
}

const VideoOutputInfo *
video_output_lookup(const gchar *output_name)
{
    const VideoOutputInfo *o;

    if (!output_name)
        return NULL;

    for (o = g_video_outputs; o->name != NULL; o++) {
        if (g_ascii_strcasecmp(o->name, output_name) == 0)
            return o;
    }
    return NULL;
}

GstVaapiDisplay *
video_output_create_display(const gchar *display_name)
{
    const VideoOutputInfo *o = g_video_output;
    GstVaapiDisplay *display = NULL;

    if (!o) {
        if (g_output_name)
            o = video_output_lookup(g_output_name);
        else {
            for (o = g_video_outputs; o->name != NULL; o++) {
                display = o->create_display(display_name);
                if (display) {
                    if (gst_vaapi_display_get_display(display))
                        break;
                    g_object_unref(display);
                    display = NULL;
                }
            }
        }
        if (!o || !o->name)
            return NULL;
        g_print("Using %s video output\n", o->name);
        g_video_output = o;
    }

    if (!display)
        display = o->create_display(display_name);
    return display;
}

GstVaapiWindow *
video_output_create_window(GstVaapiDisplay *display, guint width, guint height)
{
    if (!g_video_output)
        return NULL;
    return g_video_output->create_window(display, width, height);
}