/*
 *  gstvaapibufferproxy.c - Buffer proxy abstraction
 *
 *  Copyright (C) 2014 Intel Corporation
 *    Author: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
 *
 *  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 "sysdeps.h"
#include <va/va_drmcommon.h>
#include "gstvaapicompat.h"
#include "gstvaapibufferproxy.h"
#include "gstvaapibufferproxy_priv.h"
#include "gstvaapiutils.h"
#include "gstvaapiobject_priv.h"

#define DEBUG 1
#include "gstvaapidebug.h"

/* Ensure those symbols are actually defined in the resulting libraries */
#undef gst_vaapi_buffer_proxy_ref
#undef gst_vaapi_buffer_proxy_unref
#undef gst_vaapi_buffer_proxy_replace

guint
from_GstVaapiBufferMemoryType (guint type)
{
  guint va_type;

  switch (type) {
    case GST_VAAPI_BUFFER_MEMORY_TYPE_DMA_BUF:
      va_type = VA_SURFACE_ATTRIB_MEM_TYPE_DRM_PRIME;
      break;
    case GST_VAAPI_BUFFER_MEMORY_TYPE_GEM_BUF:
      va_type = VA_SURFACE_ATTRIB_MEM_TYPE_KERNEL_DRM;
      break;
    default:
      va_type = 0;
      break;
  }
  return va_type;
}

guint
to_GstVaapiBufferMemoryType (guint va_type)
{
  guint type;

  switch (va_type) {
    case VA_SURFACE_ATTRIB_MEM_TYPE_DRM_PRIME:
      type = GST_VAAPI_BUFFER_MEMORY_TYPE_DMA_BUF;
      break;
    case VA_SURFACE_ATTRIB_MEM_TYPE_KERNEL_DRM:
      type = GST_VAAPI_BUFFER_MEMORY_TYPE_GEM_BUF;
      break;
    default:
      type = 0;
      break;
  }
  return type;
}

static gboolean
gst_vaapi_buffer_proxy_acquire_handle (GstVaapiBufferProxy * proxy)
{
  const guint mem_type = proxy->va_info.mem_type;
  VAStatus va_status;

  if (proxy->va_info.handle)
    return TRUE;

  if (!proxy->parent || proxy->va_buf == VA_INVALID_ID)
    return FALSE;

  GST_VAAPI_OBJECT_LOCK_DISPLAY (proxy->parent);
  va_status = vaAcquireBufferHandle (GST_VAAPI_OBJECT_VADISPLAY (proxy->parent),
      proxy->va_buf, &proxy->va_info);
  GST_VAAPI_OBJECT_UNLOCK_DISPLAY (proxy->parent);
  if (!vaapi_check_status (va_status, "vaAcquireBufferHandle()"))
    return FALSE;
  if (proxy->va_info.mem_type != mem_type)
    return FALSE;
  return TRUE;
}

static gboolean
gst_vaapi_buffer_proxy_release_handle (GstVaapiBufferProxy * proxy)
{
  VAStatus va_status;

  if (!proxy->va_info.handle)
    return TRUE;

  if (!proxy->parent || proxy->va_buf == VA_INVALID_ID)
    return FALSE;

  GST_VAAPI_OBJECT_LOCK_DISPLAY (proxy->parent);
  va_status = vaReleaseBufferHandle (GST_VAAPI_OBJECT_VADISPLAY (proxy->parent),
      proxy->va_buf);
  GST_VAAPI_OBJECT_UNLOCK_DISPLAY (proxy->parent);
  if (!vaapi_check_status (va_status, "vaReleaseBufferHandle()"))
    return FALSE;
  return TRUE;
}

static void
gst_vaapi_buffer_proxy_finalize (GstVaapiBufferProxy * proxy)
{
  gst_vaapi_buffer_proxy_release_handle (proxy);

  /* Notify the user function that the object is now destroyed */
  if (proxy->destroy_func)
    proxy->destroy_func (proxy->destroy_data);

  gst_vaapi_object_replace (&proxy->parent, NULL);
}

static inline const GstVaapiMiniObjectClass *
gst_vaapi_buffer_proxy_class (void)
{
  static const GstVaapiMiniObjectClass GstVaapiBufferProxyClass = {
    sizeof (GstVaapiBufferProxy),
    (GDestroyNotify) gst_vaapi_buffer_proxy_finalize
  };
  return &GstVaapiBufferProxyClass;
}

GstVaapiBufferProxy *
gst_vaapi_buffer_proxy_new (guintptr handle, guint type, gsize size,
    GDestroyNotify destroy_func, gpointer user_data)
{
  GstVaapiBufferProxy *proxy;

  g_return_val_if_fail (handle != 0, NULL);
  g_return_val_if_fail (size > 0, NULL);

  proxy = (GstVaapiBufferProxy *)
      gst_vaapi_mini_object_new (gst_vaapi_buffer_proxy_class ());
  if (!proxy)
    return NULL;

  proxy->parent = NULL;
  proxy->destroy_func = destroy_func;
  proxy->destroy_data = user_data;
  proxy->type = type;
  proxy->va_buf = VA_INVALID_ID;
  proxy->va_info.handle = handle;
  proxy->va_info.type = VAImageBufferType;
  proxy->va_info.mem_type = from_GstVaapiBufferMemoryType (proxy->type);
  proxy->va_info.mem_size = size;
  if (!proxy->va_info.mem_type)
    goto error_unsupported_mem_type;
  return proxy;

  /* ERRORS */
error_unsupported_mem_type:
  GST_ERROR ("unsupported buffer type (%d)", proxy->type);
  gst_vaapi_buffer_proxy_unref_internal (proxy);
  return NULL;
}

GstVaapiBufferProxy *
gst_vaapi_buffer_proxy_new_from_object (GstVaapiObject * object,
    VABufferID buf_id, guint type, GDestroyNotify destroy_func, gpointer data)
{
  GstVaapiBufferProxy *proxy;

  g_return_val_if_fail (object != NULL, NULL);

  proxy = (GstVaapiBufferProxy *)
      gst_vaapi_mini_object_new (gst_vaapi_buffer_proxy_class ());
  if (!proxy)
    return NULL;

  proxy->parent = gst_vaapi_object_ref (object);
  proxy->destroy_func = destroy_func;
  proxy->destroy_data = data;
  proxy->type = type;
  proxy->va_buf = buf_id;
  memset (&proxy->va_info, 0, sizeof (proxy->va_info));
  proxy->va_info.mem_type = from_GstVaapiBufferMemoryType (proxy->type);
  if (!proxy->va_info.mem_type)
    goto error_unsupported_mem_type;
  if (!gst_vaapi_buffer_proxy_acquire_handle (proxy))
    goto error_acquire_handle;
  return proxy;

  /* ERRORS */
error_unsupported_mem_type:
  GST_ERROR ("unsupported buffer type (%d)", proxy->type);
  gst_vaapi_buffer_proxy_unref_internal (proxy);
  return NULL;
error_acquire_handle:
  GST_ERROR ("failed to acquire the underlying VA buffer handle");
  gst_vaapi_buffer_proxy_unref_internal (proxy);
  return NULL;
}

/**
 * gst_vaapi_buffer_proxy_ref:
 * @proxy: a #GstVaapiBufferProxy
 *
 * Atomically increases the reference count of the given @proxy by one.
 *
 * Returns: The same @proxy argument
 */
GstVaapiBufferProxy *
gst_vaapi_buffer_proxy_ref (GstVaapiBufferProxy * proxy)
{
  g_return_val_if_fail (proxy != NULL, NULL);

  return gst_vaapi_buffer_proxy_ref_internal (proxy);
}

/**
 * gst_vaapi_buffer_proxy_unref:
 * @proxy: a #GstVaapiBufferProxy
 *
 * Atomically decreases the reference count of the @proxy by one. If
 * the reference count reaches zero, the object will be free'd.
 */
void
gst_vaapi_buffer_proxy_unref (GstVaapiBufferProxy * proxy)
{
  g_return_if_fail (proxy != NULL);

  gst_vaapi_buffer_proxy_unref_internal (proxy);
}

/**
 * gst_vaapi_buffer_proxy_replace:
 * @old_proxy_ptr: a pointer to a #GstVaapiBufferProxy
 * @new_proxy: a #GstVaapiBufferProxy
 *
 * Atomically replaces the proxy object held in @old_proxy_ptr with
 * @new_proxy. This means that @old_proxy_ptr shall reference a valid
 * object. However, @new_proxy can be NULL.
 */
void
gst_vaapi_buffer_proxy_replace (GstVaapiBufferProxy ** old_proxy_ptr,
    GstVaapiBufferProxy * new_proxy)
{
  g_return_if_fail (old_proxy_ptr != NULL);

  gst_vaapi_buffer_proxy_replace_internal (old_proxy_ptr, new_proxy);
}

/**
 * gst_vaapi_buffer_proxy_get_type:
 * @proxy: a #GstVaapiBufferProxy
 *
 * Returns the underlying VA buffer memory type.
 *
 * Return value: the buffer memory type
 */
guint
gst_vaapi_buffer_proxy_get_type (GstVaapiBufferProxy * proxy)
{
  g_return_val_if_fail (proxy != NULL, 0);

  return GST_VAAPI_BUFFER_PROXY_TYPE (proxy);
}

/**
 * gst_vaapi_buffer_proxy_get_handle:
 * @proxy: a #GstVaapiBufferProxy
 *
 * Returns the underlying VA buffer handle stored in the @proxy.
 *
 * Return value: the buffer handle
 */
guintptr
gst_vaapi_buffer_proxy_get_handle (GstVaapiBufferProxy * proxy)
{
  g_return_val_if_fail (proxy != NULL, NULL);

  return GST_VAAPI_BUFFER_PROXY_HANDLE (proxy);
}

/**
 * gst_vaapi_buffer_proxy_get_size:
 * @proxy: a #GstVaapiBufferProxy
 *
 * Returns the underlying VA buffer memory size in bytes.
 *
 * Return value: the buffer size in bytes
 */
gsize
gst_vaapi_buffer_proxy_get_size (GstVaapiBufferProxy * proxy)
{
  g_return_val_if_fail (proxy != NULL, 0);

  return GST_VAAPI_BUFFER_PROXY_SIZE (proxy);
}