/*
 *  gstvaapidecodebin.c
 *
 *  Copyright (C) 2015 Intel Corporation
 *    Author: Sreerenj Balachandran <sreerenj.balachandran@intel.com>
 *    Author: Victor Jaquez <victorx.jaquez@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
 */

/**
 * SECTION:element-vaapidecodebin
 * @short_description: A VA-API based video decoder with a
 * post-processor
 *
 * vaapidecodebin is similar #GstVaapiDecode, but it is composed by
 * the vaapidecode, a #GstQueue, and the #GstVaapiPostproc, if it is
 * available and functional in the setup.
 *
 * It offers the functionality of #GstVaapiDecode and the many options
 * of #GstVaapiPostproc.
 *
 * <refsect2>
 * <title>Example launch line</title>
 * |[
 * gst-launch-1.0 filesrc location=~/big_buck_bunny.mov ! qtdemux ! h264parse ! vaapidecodebin ! vaapisink
 * ]|
 * </refsect2>
 */

#include "gstcompat.h"
#include <stdio.h>
#include <string.h>
#include <gst/gst.h>
#include <gst/pbutils/pbutils.h>
#include "gstvaapipluginutil.h"
#include "gstvaapidecodebin.h"
#include "gstvaapivideocontext.h"
#include "gstvaapipluginbase.h"

#define GST_PLUGIN_NAME "vaapidecodebin"
#define GST_PLUGIN_DESC "A VA-API based bin with a decoder and a postprocessor"

GST_DEBUG_CATEGORY_STATIC (gst_debug_vaapi_decode_bin);
#define GST_CAT_DEFAULT gst_debug_vaapi_decode_bin

#define DEFAULT_QUEUE_MAX_SIZE_BUFFERS 0
#define DEFAULT_QUEUE_MAX_SIZE_BYTES   0
#define DEFAULT_QUEUE_MAX_SIZE_TIME    0
#define DEFAULT_DEINTERLACE_METHOD     GST_VAAPI_DEINTERLACE_METHOD_BOB

enum
{
  PROP_0,
  PROP_MAX_SIZE_BUFFERS,
  PROP_MAX_SIZE_BYTES,
  PROP_MAX_SIZE_TIME,
  PROP_DEINTERLACE_METHOD,
  PROP_DISABLE_VPP,
  PROP_LAST
};

enum
{
  HAS_VPP_UNKNOWN,
  HAS_VPP_NO,
  HAS_VPP_YES
};

static GParamSpec *properties[PROP_LAST];

/* Default templates */
#define GST_CAPS_CODEC(CODEC) CODEC "; "
/* *INDENT-OFF* */
static const char gst_vaapi_decode_bin_sink_caps_str[] =
    GST_CAPS_CODEC("video/mpeg, mpegversion=2, systemstream=(boolean)false")
    GST_CAPS_CODEC("video/mpeg, mpegversion=4")
    GST_CAPS_CODEC("video/x-divx")
    GST_CAPS_CODEC("video/x-xvid")
    GST_CAPS_CODEC("video/x-h263")
    GST_CAPS_CODEC("video/x-h264")
#if USE_HEVC_DECODER
    GST_CAPS_CODEC("video/x-h265")
#endif
    GST_CAPS_CODEC("video/x-wmv")
#if USE_VP8_DECODER
    GST_CAPS_CODEC("video/x-vp8")
#endif
    ;
/* *INDENT-ON* */

/* *INDENT-OFF* */
static const char gst_vaapi_decode_bin_src_caps_str[] =
  GST_VAAPI_MAKE_SURFACE_CAPS ", "
  GST_CAPS_INTERLACED_FALSE "; "
  GST_VAAPI_MAKE_GLTEXUPLOAD_CAPS ", "
  GST_CAPS_INTERLACED_FALSE "; "
  GST_VIDEO_CAPS_MAKE (GST_VIDEO_FORMATS_ALL) ", "
  GST_CAPS_INTERLACED_FALSE;
/* *INDENT-ON* */

static GstStaticPadTemplate gst_vaapi_decode_bin_sink_factory =
GST_STATIC_PAD_TEMPLATE ("sink",
    GST_PAD_SINK,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS (gst_vaapi_decode_bin_sink_caps_str));

static GstStaticPadTemplate gst_vaapi_decode_bin_src_factory =
GST_STATIC_PAD_TEMPLATE ("src",
    GST_PAD_SRC,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS (gst_vaapi_decode_bin_src_caps_str));

G_DEFINE_TYPE (GstVaapiDecodeBin, gst_vaapi_decode_bin, GST_TYPE_BIN);

static void
post_missing_element_message (GstVaapiDecodeBin * vaapidecbin,
    const gchar * missing_factory)
{
  GstMessage *msg;

  GST_ERROR_OBJECT (vaapidecbin, "Failed to create %s element",
      missing_factory);
  msg =
      gst_missing_element_message_new (GST_ELEMENT_CAST (vaapidecbin),
      missing_factory);
  gst_element_post_message (GST_ELEMENT_CAST (vaapidecbin), msg);
}

static gboolean
activate_vpp (GstVaapiDecodeBin * vaapidecbin)
{
  GstPad *queue_srcpad, *srcpad, *vpp_sinkpad, *vpp_srcpad;
  gboolean res;

  if (vaapidecbin->postproc)
    return TRUE;

  if (vaapidecbin->has_vpp != HAS_VPP_YES || vaapidecbin->disable_vpp)
    return TRUE;

  GST_DEBUG_OBJECT (vaapidecbin, "Enabling VPP");

  /* create the postproc */
  vaapidecbin->postproc =
      gst_element_factory_make ("vaapipostproc", "vaapipostproc");
  if (!vaapidecbin->postproc)
    goto error_element_missing;

  g_object_set (G_OBJECT (vaapidecbin->postproc), "deinterlace-method",
      vaapidecbin->deinterlace_method, NULL);

  gst_bin_add (GST_BIN (vaapidecbin), vaapidecbin->postproc);

  if (!gst_element_sync_state_with_parent (vaapidecbin->postproc))
    goto error_sync_state;

  srcpad = gst_element_get_static_pad (GST_ELEMENT_CAST (vaapidecbin), "src");
  if (!gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (srcpad), NULL))
    goto error_link_pad;

  queue_srcpad = gst_element_get_static_pad (vaapidecbin->queue, "src");
  vpp_sinkpad = gst_element_get_static_pad (vaapidecbin->postproc, "sink");
  res = (gst_pad_link (queue_srcpad, vpp_sinkpad) == GST_PAD_LINK_OK);
  gst_object_unref (vpp_sinkpad);
  gst_object_unref (queue_srcpad);
  if (!res)
    goto error_link_pad;

  vpp_srcpad = gst_element_get_static_pad (vaapidecbin->postproc, "src");
  res = gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (srcpad), vpp_srcpad);
  gst_object_unref (vpp_srcpad);
  if (!res)
    goto error_link_pad;

  gst_object_unref (srcpad);

  return TRUE;

error_element_missing:
  {
    post_missing_element_message (vaapidecbin, "vaapipostproc");
    return FALSE;
  }
error_sync_state:
  {
    GST_ERROR_OBJECT (vaapidecbin, "Failed to sync VPP state");
    return FALSE;
  }
error_link_pad:
  {
    gst_object_unref (srcpad);
    GST_ERROR_OBJECT (vaapidecbin, "Failed to link the child elements");
    return FALSE;
  }
}

static gboolean
ensure_vpp (GstVaapiDecodeBin * vaapidecbin)
{
  GstVaapiDisplay *display;

  if (vaapidecbin->has_vpp != HAS_VPP_UNKNOWN)
    return TRUE;

  display = GST_VAAPI_PLUGIN_BASE_DISPLAY (vaapidecbin->decoder);
  if (display) {
    GST_INFO_OBJECT (vaapidecbin, "Got display from vaapidecode");
    gst_vaapi_display_ref (display);
  } else {
    GST_INFO_OBJECT (vaapidecbin, "Creating a dummy display to test for vpp");
    display = gst_vaapi_create_test_display ();
  }
  if (!display)
    return FALSE;

  vaapidecbin->has_vpp = gst_vaapi_display_has_video_processing (display) ?
      HAS_VPP_YES : HAS_VPP_NO;

  gst_vaapi_display_unref (display);

  return TRUE;
}

static gboolean
gst_vaapi_decode_bin_reconfigure (GstVaapiDecodeBin * vaapidecbin)
{
  if (!ensure_vpp (vaapidecbin))
    return FALSE;

  return activate_vpp (vaapidecbin);
}

static void
gst_vaapi_decode_bin_set_property (GObject * object,
    guint prop_id, const GValue * value, GParamSpec * pspec)
{
  GstVaapiDecodeBin *vaapidecbin = GST_VAAPI_DECODE_BIN (object);

  switch (prop_id) {
    case PROP_MAX_SIZE_BYTES:
      vaapidecbin->max_size_bytes = g_value_get_uint (value);
      g_object_set (G_OBJECT (vaapidecbin->queue), "max-size-bytes",
          vaapidecbin->max_size_bytes, NULL);
      break;
    case PROP_MAX_SIZE_BUFFERS:
      vaapidecbin->max_size_buffers = g_value_get_uint (value);
      g_object_set (G_OBJECT (vaapidecbin->queue), "max-size-buffers",
          vaapidecbin->max_size_buffers, NULL);
      break;
    case PROP_MAX_SIZE_TIME:
      vaapidecbin->max_size_time = g_value_get_uint64 (value);
      g_object_set (G_OBJECT (vaapidecbin->queue), "max-size-time",
          vaapidecbin->max_size_time, NULL);
      break;
    case PROP_DEINTERLACE_METHOD:
      vaapidecbin->deinterlace_method = g_value_get_enum (value);
      if (vaapidecbin->postproc)
        g_object_set (G_OBJECT (vaapidecbin->postproc), "deinterlace-method",
            vaapidecbin->deinterlace_method, NULL);
      break;
    case PROP_DISABLE_VPP:
    {
      gboolean disable_vpp;

      disable_vpp = g_value_get_boolean (value);
      if (!disable_vpp && !vaapidecbin->has_vpp)
        GST_WARNING_OBJECT (vaapidecbin,
            "Cannot enable VPP since the VA driver does not support it");
      else
        vaapidecbin->disable_vpp = disable_vpp;

      /* @TODO: Add run-time disabling support */
      break;
    }
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static void
gst_vaapi_decode_bin_get_property (GObject * object,
    guint prop_id, GValue * value, GParamSpec * pspec)
{
  GstVaapiDecodeBin *vaapidecbin = GST_VAAPI_DECODE_BIN (object);

  switch (prop_id) {
    case PROP_MAX_SIZE_BYTES:
      g_value_set_uint (value, vaapidecbin->max_size_bytes);
      break;
    case PROP_MAX_SIZE_BUFFERS:
      g_value_set_uint (value, vaapidecbin->max_size_buffers);
      break;
    case PROP_MAX_SIZE_TIME:
      g_value_set_uint64 (value, vaapidecbin->max_size_time);
      break;
    case PROP_DEINTERLACE_METHOD:
      g_value_set_enum (value, vaapidecbin->deinterlace_method);
      break;
    case PROP_DISABLE_VPP:
      g_value_set_boolean (value, vaapidecbin->disable_vpp);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static void
gst_vaapi_decode_bin_handle_message (GstBin * bin, GstMessage * message)
{
  GstVaapiDecodeBin *vaapidecbin = GST_VAAPI_DECODE_BIN (bin);
  GstMessageType type;
  GstContext *context = NULL;
  const gchar *context_type;
  GstVaapiDisplay *display = NULL;

  type = GST_MESSAGE_TYPE (message);
  if (type != GST_MESSAGE_HAVE_CONTEXT)
    goto bail;
  gst_message_parse_have_context (message, &context);
  if (!context)
    goto bail;
  context_type = gst_context_get_context_type (context);
  if (g_strcmp0 (context_type, GST_VAAPI_DISPLAY_CONTEXT_TYPE_NAME) != 0)
    goto bail;
  if (!gst_vaapi_video_context_get_display (context, &display))
    goto bail;

  vaapidecbin->has_vpp = gst_vaapi_display_has_video_processing (display) ?
      HAS_VPP_YES : HAS_VPP_NO;

  /* the underlying VA driver implementation doesn't support video
   * post-processing, hence we have to disable it */
  if (vaapidecbin->has_vpp != HAS_VPP_YES) {
    GST_WARNING_OBJECT (vaapidecbin, "VA driver doesn't support VPP");
    if (!vaapidecbin->disable_vpp) {
      vaapidecbin->disable_vpp = TRUE;
      g_object_notify_by_pspec (G_OBJECT (vaapidecbin),
          properties[PROP_DISABLE_VPP]);
    }
  }

bail:
  if (display)
    gst_vaapi_display_unref (display);

  if (context)
    gst_context_unref (context);

  GST_BIN_CLASS (gst_vaapi_decode_bin_parent_class)->handle_message (bin,
      message);
}

static GstStateChangeReturn
gst_vaapi_decode_bin_change_state (GstElement * element,
    GstStateChange transition)
{
  GstVaapiDecodeBin *vaapidecbin = GST_VAAPI_DECODE_BIN (element);
  GstStateChangeReturn ret;

  switch (transition) {
    default:
      break;
  }

  ret = GST_ELEMENT_CLASS (gst_vaapi_decode_bin_parent_class)->change_state
      (element, transition);
  if (ret == GST_STATE_CHANGE_FAILURE)
    return ret;

  switch (transition) {
    case GST_STATE_CHANGE_NULL_TO_READY:
      if (!gst_vaapi_decode_bin_reconfigure (vaapidecbin))
        return GST_STATE_CHANGE_FAILURE;
      break;
    default:
      break;
  }

  return ret;
}

static void
gst_vaapi_decode_bin_class_init (GstVaapiDecodeBinClass * klass)
{
  GObjectClass *gobject_class;
  GstElementClass *element_class;
  GstBinClass *bin_class;

  gobject_class = G_OBJECT_CLASS (klass);
  element_class = GST_ELEMENT_CLASS (klass);
  bin_class = GST_BIN_CLASS (klass);

  gobject_class->set_property = gst_vaapi_decode_bin_set_property;
  gobject_class->get_property = gst_vaapi_decode_bin_get_property;

  element_class->change_state =
      GST_DEBUG_FUNCPTR (gst_vaapi_decode_bin_change_state);

  bin_class->handle_message =
      GST_DEBUG_FUNCPTR (gst_vaapi_decode_bin_handle_message);

  gst_element_class_set_static_metadata (element_class,
      "VA-API Decode Bin",
      "Codec/Decoder/Video",
      GST_PLUGIN_DESC,
      "Sreerenj Balachandran <sreerenj.balachandran@intel.com>, "
      "Victor Jaquez <victorx.jaquez@intel.com>");

  properties[PROP_MAX_SIZE_BYTES] = g_param_spec_uint ("max-size-bytes",
      "Max. size (kB)", "Max. amount of data in the queue (bytes, 0=disable)",
      0, G_MAXUINT, DEFAULT_QUEUE_MAX_SIZE_BYTES,
      G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
  properties[PROP_MAX_SIZE_BUFFERS] = g_param_spec_uint ("max-size-buffers",
      "Max. size (buffers)", "Max. number of buffers in the queue (0=disable)",
      0, G_MAXUINT, DEFAULT_QUEUE_MAX_SIZE_BUFFERS,
      G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
  properties[PROP_MAX_SIZE_TIME] = g_param_spec_uint64 ("max-size-time",
      "Max. size (ns)", "Max. amount of data in the queue (in ns, 0=disable)",
      0, G_MAXUINT64, DEFAULT_QUEUE_MAX_SIZE_TIME,
      G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
  properties[PROP_DEINTERLACE_METHOD] = g_param_spec_enum ("deinterlace-method",
      "Deinterlace method", "Deinterlace method to use",
      GST_VAAPI_TYPE_DEINTERLACE_METHOD, DEFAULT_DEINTERLACE_METHOD,
      G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
  properties[PROP_DISABLE_VPP] = g_param_spec_boolean ("disable-vpp",
      "Disable VPP",
      "Disable Video Post Processing (No support for run time disabling)",
      FALSE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);

  g_object_class_install_properties (gobject_class, PROP_LAST, properties);

  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&gst_vaapi_decode_bin_sink_factory));

  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&gst_vaapi_decode_bin_src_factory));

  GST_DEBUG_CATEGORY_INIT (gst_debug_vaapi_decode_bin,
      GST_PLUGIN_NAME, 0, GST_PLUGIN_DESC);
}

static gboolean
gst_vaapi_decode_bin_configure (GstVaapiDecodeBin * vaapidecbin)
{
  const gchar *missing_factory = NULL;
  GstPad *pad, *ghostpad;
  GstPadTemplate *tmpl;

  /* create the decoder */
  /* @FIXME: "vaapidecode" is going to be removed soon: (bug
   * #734093). Instead there are going to be a set of elements
   * "vaapi{codec}dec". We will need a mechanism to automatically
   * select de correct decoder based on caps.
   */
  vaapidecbin->decoder =
      gst_element_factory_make ("vaapidecode", "vaapidecode");
  if (!vaapidecbin->decoder) {
    missing_factory = "vaapidecode";
    goto error_element_missing;
  }
  /* create the queue */
  vaapidecbin->queue = gst_element_factory_make ("queue", "queue");
  if (!vaapidecbin->queue) {
    missing_factory = "queue";
    goto error_element_missing;
  }

  g_object_set (G_OBJECT (vaapidecbin->queue),
      "max-size-bytes", vaapidecbin->max_size_bytes,
      "max-size-buffers", vaapidecbin->max_size_buffers,
      "max-size-time", vaapidecbin->max_size_time, NULL);

  gst_bin_add_many (GST_BIN (vaapidecbin), vaapidecbin->decoder,
      vaapidecbin->queue, NULL);

  if (!gst_element_link_many (vaapidecbin->decoder, vaapidecbin->queue, NULL))
    goto error_link_pad;

  /* create ghost pad sink */
  pad = gst_element_get_static_pad (GST_ELEMENT (vaapidecbin->decoder), "sink");
  ghostpad = gst_ghost_pad_new_from_template ("sink", pad,
      GST_PAD_PAD_TEMPLATE (pad));
  gst_object_unref (pad);
  if (!gst_element_add_pad (GST_ELEMENT (vaapidecbin), ghostpad))
    goto error_adding_pad;

  /* create ghost pad src */
  pad = gst_element_get_static_pad (GST_ELEMENT (vaapidecbin->queue), "src");
  tmpl = gst_static_pad_template_get (&gst_vaapi_decode_bin_src_factory);
  ghostpad = gst_ghost_pad_new_from_template ("src", pad, tmpl);
  gst_object_unref (pad);
  gst_object_unref (tmpl);
  if (!gst_element_add_pad (GST_ELEMENT (vaapidecbin), ghostpad))
    goto error_adding_pad;

  return TRUE;

error_element_missing:
  {
    post_missing_element_message (vaapidecbin, missing_factory);
    return FALSE;
  }
error_link_pad:
  {
    GST_ELEMENT_ERROR (vaapidecbin, CORE, PAD, (NULL),
        ("Failed to configure the vaapidecodebin."));
    return FALSE;
  }
error_adding_pad:
  {
    GST_ELEMENT_ERROR (vaapidecbin, CORE, PAD, (NULL),
        ("Failed to adding pads."));
    return FALSE;
  }
}

static void
gst_vaapi_decode_bin_init (GstVaapiDecodeBin * vaapidecbin)
{
  vaapidecbin->has_vpp = HAS_VPP_UNKNOWN;
  vaapidecbin->deinterlace_method = DEFAULT_DEINTERLACE_METHOD;

  gst_vaapi_decode_bin_configure (vaapidecbin);
}
