/*
 *  gstvaapidecodebin.c
 *
 *  Copyright (C) 2015 Intel Corporation
 *    Author: Sreerenj Balachandran <sreerenj.balachandran@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 "gstcompat.h"
#include <stdio.h>
#include <string.h>
#include <gst/gst.h>
#include <gst/pbutils/pbutils.h>
#include "gstvaapipluginutil.h"
#include "gstvaapidecodebin.h"

#define GST_PLUGIN_NAME "vaapidecodebin"
#define GST_PLUGIN_DESC "A Bin of VA-API elements: vaapidecode ! queue ! vaapipostproc"

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

enum
{
  PROP_0,
  PROP_MAX_SIZE_BUFFERS,
  PROP_MAX_SIZE_BYTES,
  PROP_MAX_SIZE_TIME
};

#define GST_VAAPI_DECODE_BIN_SURFACE_CAPS \
    GST_VIDEO_CAPS_MAKE_WITH_FEATURES(  \
        GST_CAPS_FEATURE_MEMORY_VAAPI_SURFACE, "{ ENCODED, I420, YV12, NV12 }")

/* 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
#if USE_JPEG_DECODER
    GST_CAPS_CODEC("image/jpeg")
#endif
    ;
/* *INDENT-ON* */

/* *INDENT-OFF* */
static const char gst_vaapi_decode_bin_src_caps_str[] =
  GST_VAAPI_DECODE_BIN_SURFACE_CAPS ", "
  GST_CAPS_INTERLACED_FALSE "; "
  GST_VIDEO_CAPS_MAKE_WITH_FEATURES (
      GST_CAPS_FEATURE_META_GST_VIDEO_GL_TEXTURE_UPLOAD_META, "{ RGBA, BGRA }") ", "
  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
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;
    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;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

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

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

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

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

  g_object_class_install_property (gobject_class, 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));
  g_object_class_install_property (gobject_class, 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));
  g_object_class_install_property (gobject_class, 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));

  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)
{
  gchar *missing_factory = NULL;

  /* create the decoder */
  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;
  }
  /* create the postproc */
  vaapidecbin->postproc =
      gst_element_factory_make ("vaapipostproc", "vaapipostproc");
  if (!vaapidecbin->postproc) {
    missing_factory = "vaapipostproc";
    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, vaapidecbin->postproc, NULL);

  if (!gst_element_link_pads_full (vaapidecbin->decoder, "src",
          vaapidecbin->queue, "sink", GST_PAD_LINK_CHECK_NOTHING))
    goto error_link_pad;

  if (!gst_element_link_pads_full (vaapidecbin->queue, "src",
          vaapidecbin->postproc, "sink", GST_PAD_LINK_CHECK_NOTHING))
    goto error_link_pad;

  return TRUE;

error_element_missing:
  {
    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);
    return FALSE;
  }
error_link_pad:
  {
    GST_ERROR_OBJECT (vaapidecbin, "Failed to link the child elements");
    return FALSE;
  }
}

static void
gst_vaapi_decode_bin_init (GstVaapiDecodeBin * vaapidecbin)
{
  GstPad *element_pad, *ghost_pad;

  if (!gst_vaapi_decode_bin_configure (vaapidecbin))
    return;

  /* create ghost pad sink */
  element_pad =
      gst_element_get_static_pad (GST_ELEMENT (vaapidecbin->decoder), "sink");
  ghost_pad =
      gst_ghost_pad_new_from_template ("sink", element_pad,
      GST_PAD_PAD_TEMPLATE (element_pad));
  gst_object_unref (element_pad);
  gst_element_add_pad (GST_ELEMENT (vaapidecbin), ghost_pad);

  /* create ghost pad src */
  element_pad =
      gst_element_get_static_pad (GST_ELEMENT (vaapidecbin->postproc), "src");
  ghost_pad =
      gst_ghost_pad_new_from_template ("src", element_pad,
      GST_PAD_PAD_TEMPLATE (element_pad));
  gst_object_unref (element_pad);
  gst_element_add_pad (GST_ELEMENT (vaapidecbin), ghost_pad);
}