/* GStreamer
 * Copyright (C) 2019 Seungha Yang <seungha.yang@navercorp.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.
 */

/**
 * SECTION:element-d3d11h265dec
 * @title: d3d11h265dec
 *
 * A Direct3D11/DXVA based H.265 video decoder
 *
 * ## Example launch line
 * ```
 * gst-launch-1.0 filesrc location=/path/to/hevc/file ! parsebin ! d3d11h265dec ! d3d11videosink
 * ```
 *
 * Since: 1.18
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "gstd3d11h265dec.h"
#include <gst/dxva/gstdxvah265decoder.h>

GST_DEBUG_CATEGORY_EXTERN (gst_d3d11_h265_dec_debug);
#define GST_CAT_DEFAULT gst_d3d11_h265_dec_debug

GST_D3D11_DECODER_DEFINE_TYPE (GstD3D11H265Dec, gst_d3d11_h265_dec,
    GST, D3D11_H265_DEC, GstDxvaH265Decoder);

static void
gst_d3d11_h265_dec_class_init (GstD3D11H265DecClass * klass, gpointer data)
{
  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
  GstVideoDecoderClass *decoder_class = GST_VIDEO_DECODER_CLASS (klass);
  GstDxvaH265DecoderClass *dxva_class = GST_DXVA_H265_DECODER_CLASS (klass);
  GstD3D11DecoderClassData *cdata = (GstD3D11DecoderClassData *) data;

  gobject_class->get_property = gst_d3d11_h265_dec_get_property;

  element_class->set_context =
      GST_DEBUG_FUNCPTR (gst_d3d11_h265_dec_set_context);

  parent_class = (GstElementClass *) g_type_class_peek_parent (klass);
  gst_d3d11_decoder_class_data_fill_subclass_data (cdata, &klass->class_data);

  /**
   * GstD3D11H265Dec:adapter-luid:
   *
   * DXGI Adapter LUID for this element
   *
   * Since: 1.20
   */
  gst_d3d11_decoder_proxy_class_init (element_class, cdata,
      "Seungha Yang <seungha.yang@navercorp.com>");

  decoder_class->open = GST_DEBUG_FUNCPTR (gst_d3d11_h265_dec_open);
  decoder_class->close = GST_DEBUG_FUNCPTR (gst_d3d11_h265_dec_close);
  decoder_class->negotiate = GST_DEBUG_FUNCPTR (gst_d3d11_h265_dec_negotiate);
  decoder_class->decide_allocation =
      GST_DEBUG_FUNCPTR (gst_d3d11_h265_dec_decide_allocation);
  decoder_class->sink_query = GST_DEBUG_FUNCPTR (gst_d3d11_h265_dec_sink_query);
  decoder_class->src_query = GST_DEBUG_FUNCPTR (gst_d3d11_h265_dec_src_query);
  decoder_class->sink_event = GST_DEBUG_FUNCPTR (gst_d3d11_h265_dec_sink_event);

  dxva_class->configure = GST_DEBUG_FUNCPTR (gst_d3d11_h265_dec_configure);
  dxva_class->new_picture = GST_DEBUG_FUNCPTR (gst_d3d11_h265_dec_new_picture);
  dxva_class->get_picture_id =
      GST_DEBUG_FUNCPTR (gst_d3d11_h265_dec_get_picture_id);
  dxva_class->start_picture =
      GST_DEBUG_FUNCPTR (gst_d3d11_h265_dec_start_picture);
  dxva_class->end_picture = GST_DEBUG_FUNCPTR (gst_d3d11_h265_dec_end_picture);
  dxva_class->output_picture =
      GST_DEBUG_FUNCPTR (gst_d3d11_h265_dec_output_picture);
}

static void
gst_d3d11_h265_dec_init (GstD3D11H265Dec * self)
{
}

static void
gst_d3d11_h265_dec_get_property (GObject * object, guint prop_id,
    GValue * value, GParamSpec * pspec)
{
  GstD3D11H265DecClass *klass = GST_D3D11_H265_DEC_GET_CLASS (object);
  GstD3D11DecoderSubClassData *cdata = &klass->class_data;

  gst_d3d11_decoder_proxy_get_property (object, prop_id, value, pspec, cdata);
}

static void
gst_d3d11_h265_dec_set_context (GstElement * element, GstContext * context)
{
  GstD3D11H265Dec *self = GST_D3D11_H265_DEC (element);
  GstD3D11H265DecClass *klass = GST_D3D11_H265_DEC_GET_CLASS (self);
  GstD3D11DecoderSubClassData *cdata = &klass->class_data;

  gst_d3d11_handle_set_context_for_adapter_luid (element,
      context, cdata->adapter_luid, &self->device);

  GST_ELEMENT_CLASS (parent_class)->set_context (element, context);
}

static gboolean
gst_d3d11_h265_dec_open (GstVideoDecoder * decoder)
{
  GstD3D11H265Dec *self = GST_D3D11_H265_DEC (decoder);
  GstD3D11H265DecClass *klass = GST_D3D11_H265_DEC_GET_CLASS (self);
  GstD3D11DecoderSubClassData *cdata = &klass->class_data;

  return gst_d3d11_decoder_proxy_open (decoder,
      cdata, &self->device, &self->decoder);
}

static gboolean
gst_d3d11_h265_dec_close (GstVideoDecoder * decoder)
{
  GstD3D11H265Dec *self = GST_D3D11_H265_DEC (decoder);

  gst_clear_object (&self->decoder);
  gst_clear_object (&self->device);

  return TRUE;
}

static gboolean
gst_d3d11_h265_dec_negotiate (GstVideoDecoder * decoder)
{
  GstD3D11H265Dec *self = GST_D3D11_H265_DEC (decoder);

  if (!gst_d3d11_decoder_negotiate (self->decoder, decoder))
    return FALSE;

  return GST_VIDEO_DECODER_CLASS (parent_class)->negotiate (decoder);
}

static gboolean
gst_d3d11_h265_dec_decide_allocation (GstVideoDecoder * decoder,
    GstQuery * query)
{
  GstD3D11H265Dec *self = GST_D3D11_H265_DEC (decoder);

  if (!gst_d3d11_decoder_decide_allocation (self->decoder, decoder, query))
    return FALSE;

  return GST_VIDEO_DECODER_CLASS (parent_class)->decide_allocation
      (decoder, query);
}

static gboolean
gst_d3d11_h265_dec_sink_query (GstVideoDecoder * decoder, GstQuery * query)
{
  GstD3D11H265Dec *self = GST_D3D11_H265_DEC (decoder);

  switch (GST_QUERY_TYPE (query)) {
    case GST_QUERY_CONTEXT:
      if (gst_d3d11_handle_context_query (GST_ELEMENT (decoder),
              query, self->device)) {
        return TRUE;
      }
      break;
    default:
      break;
  }

  return GST_VIDEO_DECODER_CLASS (parent_class)->sink_query (decoder, query);
}

static gboolean
gst_d3d11_h265_dec_src_query (GstVideoDecoder * decoder, GstQuery * query)
{
  GstD3D11H265Dec *self = GST_D3D11_H265_DEC (decoder);

  switch (GST_QUERY_TYPE (query)) {
    case GST_QUERY_CONTEXT:
      if (gst_d3d11_handle_context_query (GST_ELEMENT (decoder),
              query, self->device)) {
        return TRUE;
      }
      break;
    default:
      break;
  }

  return GST_VIDEO_DECODER_CLASS (parent_class)->src_query (decoder, query);
}

static gboolean
gst_d3d11_h265_dec_sink_event (GstVideoDecoder * decoder, GstEvent * event)
{
  GstD3D11H265Dec *self = GST_D3D11_H265_DEC (decoder);

  if (self->decoder)
    gst_d3d11_decoder_sink_event (self->decoder, event);

  return GST_VIDEO_DECODER_CLASS (parent_class)->sink_event (decoder, event);
}

static GstFlowReturn
gst_d3d11_h265_dec_configure (GstDxvaH265Decoder * decoder,
    GstVideoCodecState * input_state, const GstVideoInfo * info,
    gint crop_x, gint crop_y, gint coded_width, gint coded_height,
    gint max_dpb_size)
{
  GstD3D11H265Dec *self = GST_D3D11_H265_DEC (decoder);

  return gst_d3d11_decoder_configure (self->decoder, input_state,
      info, crop_x, crop_y, coded_width, coded_height, max_dpb_size);
}

static GstFlowReturn
gst_d3d11_h265_dec_new_picture (GstDxvaH265Decoder * decoder,
    GstCodecPicture * picture)
{
  GstD3D11H265Dec *self = GST_D3D11_H265_DEC (decoder);

  return gst_d3d11_decoder_new_picture (self->decoder,
      GST_VIDEO_DECODER (decoder), picture);
}

static guint8
gst_d3d11_h265_dec_get_picture_id (GstDxvaH265Decoder * decoder,
    GstCodecPicture * picture)
{
  GstD3D11H265Dec *self = GST_D3D11_H265_DEC (decoder);

  return gst_d3d11_decoder_get_picture_id (self->decoder, picture);
}

static GstFlowReturn
gst_d3d11_h265_dec_start_picture (GstDxvaH265Decoder * decoder,
    GstCodecPicture * picture, guint8 * picture_id)
{
  GstD3D11H265Dec *self = GST_D3D11_H265_DEC (decoder);

  return gst_d3d11_decoder_start_picture (self->decoder, picture, picture_id);
}

static GstFlowReturn
gst_d3d11_h265_dec_end_picture (GstDxvaH265Decoder * decoder,
    GstCodecPicture * picture, GPtrArray * ref_pics,
    const GstDxvaDecodingArgs * args)
{
  GstD3D11H265Dec *self = GST_D3D11_H265_DEC (decoder);

  return gst_d3d11_decoder_end_picture (self->decoder, picture, args);
}

static GstFlowReturn
gst_d3d11_h265_dec_output_picture (GstDxvaH265Decoder * decoder,
    GstVideoCodecFrame * frame, GstCodecPicture * picture,
    GstVideoBufferFlags buffer_flags, gint display_width, gint display_height)
{
  GstD3D11H265Dec *self = GST_D3D11_H265_DEC (decoder);

  return gst_d3d11_decoder_output_picture (self->decoder,
      GST_VIDEO_DECODER (decoder), frame, picture,
      buffer_flags, display_width, display_height);
}

void
gst_d3d11_h265_dec_register (GstPlugin * plugin, GstD3D11Device * device,
    guint rank)
{
  GType type;
  gchar *type_name;
  gchar *feature_name;
  guint index = 0;
  guint i;
  const GUID *profile = nullptr;
  GTypeInfo type_info = {
    sizeof (GstD3D11H265DecClass),
    nullptr,
    nullptr,
    (GClassInitFunc) gst_d3d11_h265_dec_class_init,
    nullptr,
    nullptr,
    sizeof (GstD3D11H265Dec),
    0,
    (GInstanceInitFunc) gst_d3d11_h265_dec_init,
  };
  const GUID *main_10_guid = nullptr;
  const GUID *main_guid = nullptr;
  GstCaps *sink_caps = nullptr;
  GstCaps *src_caps = nullptr;
  GstCaps *src_caps_copy;
  GstCaps *tmp;
  GstCapsFeatures *caps_features;
  guint max_width = 0;
  guint max_height = 0;
  guint resolution;
  gboolean have_main10 = FALSE;
  gboolean have_main = FALSE;
  DXGI_FORMAT format = DXGI_FORMAT_UNKNOWN;

  have_main10 = gst_d3d11_decoder_get_supported_decoder_profile (device,
      GST_DXVA_CODEC_H265, GST_VIDEO_FORMAT_P010_10LE, &main_10_guid);
  if (!have_main10) {
    GST_DEBUG_OBJECT (device, "decoder does not support HEVC_VLD_MAIN10");
  } else {
    have_main10 &=
        gst_d3d11_decoder_supports_format (device, main_10_guid,
        DXGI_FORMAT_P010);
    if (!have_main10) {
      GST_FIXME_OBJECT (device, "device does not support P010 format");
    }
  }

  have_main = gst_d3d11_decoder_get_supported_decoder_profile (device,
      GST_DXVA_CODEC_H265, GST_VIDEO_FORMAT_NV12, &main_guid);
  if (!have_main) {
    GST_DEBUG_OBJECT (device, "decoder does not support HEVC_VLD_MAIN");
  } else {
    have_main =
        gst_d3d11_decoder_supports_format (device, main_guid, DXGI_FORMAT_NV12);
    if (!have_main) {
      GST_FIXME_OBJECT (device, "device does not support NV12 format");
    }
  }

  if (!have_main10 && !have_main) {
    GST_INFO_OBJECT (device, "device does not support h.265 decoding");
    return;
  }

  if (have_main) {
    profile = main_guid;
    format = DXGI_FORMAT_NV12;
  } else {
    profile = main_10_guid;
    format = DXGI_FORMAT_P010;
  }

  for (i = 0; i < G_N_ELEMENTS (gst_dxva_resolutions); i++) {
    if (gst_d3d11_decoder_supports_resolution (device, profile,
            format, gst_dxva_resolutions[i].width,
            gst_dxva_resolutions[i].height)) {
      max_width = gst_dxva_resolutions[i].width;
      max_height = gst_dxva_resolutions[i].height;

      GST_DEBUG_OBJECT (device,
          "device support resolution %dx%d", max_width, max_height);
    } else {
      break;
    }
  }

  if (max_width == 0 || max_height == 0) {
    GST_WARNING_OBJECT (device, "Couldn't query supported resolution");
    return;
  }

  sink_caps = gst_caps_from_string ("video/x-h265, "
      "stream-format=(string) { hev1, hvc1, byte-stream }, "
      "alignment= (string) au");
  src_caps = gst_caps_new_empty_simple ("video/x-raw");

  if (have_main10) {
    /* main10 profile covers main and main10 */
    GValue profile_list = G_VALUE_INIT;
    GValue profile_value = G_VALUE_INIT;
    GValue format_list = G_VALUE_INIT;
    GValue format_value = G_VALUE_INIT;

    g_value_init (&profile_list, GST_TYPE_LIST);

    g_value_init (&profile_value, G_TYPE_STRING);
    g_value_set_string (&profile_value, "main");
    gst_value_list_append_and_take_value (&profile_list, &profile_value);

    g_value_init (&profile_value, G_TYPE_STRING);
    g_value_set_string (&profile_value, "main-10");
    gst_value_list_append_and_take_value (&profile_list, &profile_value);


    g_value_init (&format_list, GST_TYPE_LIST);

    g_value_init (&format_value, G_TYPE_STRING);
    g_value_set_string (&format_value, "NV12");
    gst_value_list_append_and_take_value (&format_list, &format_value);

    g_value_init (&format_value, G_TYPE_STRING);
    g_value_set_string (&format_value, "P010_10LE");
    gst_value_list_append_and_take_value (&format_list, &format_value);

    gst_caps_set_value (sink_caps, "profile", &profile_list);
    gst_caps_set_value (src_caps, "format", &format_list);
    g_value_unset (&profile_list);
    g_value_unset (&format_list);
  } else {
    gst_caps_set_simple (sink_caps, "profile", G_TYPE_STRING, "main", nullptr);
    gst_caps_set_simple (src_caps, "format", G_TYPE_STRING, "NV12", nullptr);
  }

  /* To cover both landscape and portrait, select max value */
  resolution = MAX (max_width, max_height);

  /* Copy src caps to append other capsfeatures */
  src_caps_copy = gst_caps_copy (src_caps);

  /* System memory with alternate interlace-mode */
  tmp = gst_caps_copy (src_caps_copy);
  caps_features =
      gst_caps_features_new_static_str (GST_CAPS_FEATURE_FORMAT_INTERLACED,
      nullptr);
  gst_caps_set_features_simple (tmp, caps_features);
  gst_caps_set_simple (tmp, "interlace-mode", G_TYPE_STRING, "alternate",
      nullptr);
  gst_caps_append (src_caps, tmp);

  /* D3D11 memory feature */
  tmp = gst_caps_copy (src_caps_copy);
  caps_features =
      gst_caps_features_new_static_str (GST_CAPS_FEATURE_MEMORY_D3D11_MEMORY,
      nullptr);
  gst_caps_set_features_simple (tmp, caps_features);
  gst_caps_append (src_caps, tmp);

  /* FIXME: D3D11 deinterlace element is not prepared, so this D3D11 with
   * interlaced caps feature is pointless at the moment */
#if 0
  /* D3D11 memory with alternate interlace-mode */
  tmp = gst_caps_copy (src_caps_copy);
  caps_features =
      gst_caps_features_new_static_str (GST_CAPS_FEATURE_MEMORY_D3D11_MEMORY,
      GST_CAPS_FEATURE_FORMAT_INTERLACED, nullptr);
  gst_caps_set_features_simple (tmp, caps_features);
  gst_caps_set_simple (tmp, "interlace-mode", G_TYPE_STRING, "alternate",
      nullptr);
  gst_caps_append (src_caps, tmp);
#endif

  gst_caps_unref (src_caps_copy);

  type_info.class_data =
      gst_d3d11_decoder_class_data_new (device, GST_DXVA_CODEC_H265,
      sink_caps, src_caps, resolution);

  type_name = g_strdup ("GstD3D11H265Dec");
  feature_name = g_strdup ("d3d11h265dec");

  while (g_type_from_name (type_name)) {
    index++;
    g_free (type_name);
    g_free (feature_name);
    type_name = g_strdup_printf ("GstD3D11H265Device%dDec", index);
    feature_name = g_strdup_printf ("d3d11h265device%ddec", index);
  }

  type = g_type_register_static (GST_TYPE_DXVA_H265_DECODER,
      type_name, &type_info, (GTypeFlags) 0);

  /* make lower rank than default device */
  if (rank > 0 && index != 0)
    rank--;

  if (index != 0)
    gst_element_type_set_skip_documentation (type);

  if (!gst_element_register (plugin, feature_name, rank, type))
    GST_WARNING ("Failed to register plugin '%s'", type_name);

  g_free (type_name);
  g_free (feature_name);
}