/*
 *  gstvaapivideobuffer_glx.c - Gst VA video buffer
 *
 *  Copyright (C) 2011 Intel Corporation
 *  Copyright (C) 2011 Collabora Ltd.
 *    Author: Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>
 *
 *  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
 */

/**
 * SECTION:gstvaapivideobufferglx
 * @short_description: VA video buffer for GStreamer with GLX support
 */

#include "config.h"
#include "gstvaapivideobuffer_glx.h"
#include "gstvaapivideobuffer_priv.h"
#include "gstvaapivideoconverter_glx.h"
#include "gstvaapiobject_priv.h"
#include "gstvaapiimagepool.h"
#include "gstvaapisurfacepool.h"

#define DEBUG 1
#include "gstvaapidebug.h"

G_DEFINE_TYPE (GstVaapiVideoBufferGLX, gst_vaapi_video_buffer_glx,
               GST_VAAPI_TYPE_VIDEO_BUFFER);

static void
gst_vaapi_video_buffer_glx_class_init(GstVaapiVideoBufferGLXClass * klass)
{
  GstSurfaceBufferClass * const surface_class = GST_SURFACE_BUFFER_CLASS (klass);
  surface_class->create_converter = gst_vaapi_video_converter_glx_new;
}

static void
gst_vaapi_video_buffer_glx_init (GstVaapiVideoBufferGLX * buffer)
{
}

static inline gpointer
_gst_vaapi_video_buffer_glx_new (void)
{
  return gst_mini_object_new (GST_VAAPI_TYPE_VIDEO_BUFFER_GLX);
}

/**
 * gst_vaapi_video_buffer_glx_new:
 * @display: a #GstVaapiDisplayGLX
 *
 * Creates an empty #GstBuffer. The caller is responsible for completing
 * the initialization of the buffer with the gst_vaapi_video_buffer_set_*()
 * functions.
 *
 * Return value: the newly allocated #GstBuffer, or %NULL or error
 */
GstBuffer *
gst_vaapi_video_buffer_glx_new(GstVaapiDisplayGLX * display)
{
  GstBuffer *buffer;

  g_return_val_if_fail (GST_VAAPI_IS_DISPLAY_GLX (display), NULL);

  buffer = _gst_vaapi_video_buffer_glx_new ();
  if (!buffer)
    return NULL;

  gst_vaapi_video_buffer_set_display (GST_VAAPI_VIDEO_BUFFER (buffer),
      GST_VAAPI_DISPLAY (display));
  return buffer;
}

/**
 * gst_vaapi_video_buffer_glx_new_from_pool:
 * @pool: a #GstVaapiVideoPool
 *
 * Creates a #GstBuffer with a video object allocated from a @pool.
 * Only #GstVaapiSurfacePool and #GstVaapiImagePool pools are supported.
 *
 * The buffer is destroyed through the last call to gst_buffer_unref()
 * and the video objects are pushed back to their respective pools.
 *
 * Return value: the newly allocated #GstBuffer, or %NULL on error
 */
GstBuffer *
gst_vaapi_video_buffer_glx_new_from_pool (GstVaapiVideoPool * pool)
{
  GstVaapiVideoBuffer *buffer;
  gboolean is_image_pool, is_surface_pool;

  g_return_val_if_fail (GST_VAAPI_IS_VIDEO_POOL (pool), NULL);

  is_image_pool   = GST_VAAPI_IS_IMAGE_POOL (pool);
  is_surface_pool = GST_VAAPI_IS_SURFACE_POOL (pool);

  if (!is_image_pool && !is_surface_pool)
    return NULL;

  buffer = _gst_vaapi_video_buffer_glx_new ();
  if (buffer &&
      ((is_image_pool &&
        gst_vaapi_video_buffer_set_image_from_pool (buffer, pool)) ||
       (is_surface_pool &&
        gst_vaapi_video_buffer_set_surface_from_pool (buffer, pool)))) {
    gst_vaapi_video_buffer_set_display (buffer,
        gst_vaapi_video_pool_get_display (pool));
    return GST_BUFFER (buffer);
  }

  gst_mini_object_unref (GST_MINI_OBJECT(buffer));
  return NULL;
}

/**
 * gst_vaapi_video_buffer_glx_new_from_buffer:
 * @buffer: a #GstBuffer
 *
 * Creates a #GstBuffer with video objects bound to @buffer video
 * objects, if any.
 *
 * Return value: the newly allocated #GstBuffer, or %NULL on error
 */
GstBuffer *
gst_vaapi_video_buffer_glx_new_from_buffer (GstBuffer * buffer)
{
  GstVaapiVideoBuffer *inbuf, *outbuf;
  GstVaapiImage *image;
  GstVaapiSurface *surface;
  GstVaapiSurfaceProxy *proxy;

  if (!GST_VAAPI_IS_VIDEO_BUFFER_GLX (buffer)) {
    if (!buffer->parent || !GST_VAAPI_IS_VIDEO_BUFFER_GLX (buffer->parent))
      return NULL;
    buffer = buffer->parent;
  }
  inbuf = GST_VAAPI_VIDEO_BUFFER (buffer);

  outbuf = _gst_vaapi_video_buffer_glx_new ();
  if (!outbuf)
    return NULL;

  image = gst_vaapi_video_buffer_get_image (inbuf);
  surface = gst_vaapi_video_buffer_get_surface (inbuf);
  proxy =
    gst_vaapi_video_buffer_get_surface_proxy (inbuf);

  if (image)
    gst_vaapi_video_buffer_set_image (outbuf, image);
  if (surface)
    gst_vaapi_video_buffer_set_surface (outbuf, surface);
  if (proxy)
    gst_vaapi_video_buffer_set_surface_proxy (outbuf, proxy);

  gst_vaapi_video_buffer_set_buffer (outbuf, buffer);
  return GST_BUFFER (outbuf);
}