/* GStreamer Intel MSDK plugin
 * Copyright (c) 2016, Oblong Industries, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

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

#include "gstmsdkh264enc.h"

#include <gst/pbutils/pbutils.h>

GST_DEBUG_CATEGORY_EXTERN (gst_msdkh264enc_debug);
#define GST_CAT_DEFAULT gst_msdkh264enc_debug

enum
{
  PROP_0,
  PROP_CABAC,
  PROP_LOW_POWER
};

#define PROP_CABAC_DEFAULT            TRUE
#define PROP_LOWPOWER_DEFAULT         FALSE

static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
    GST_PAD_SRC,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("video/x-h264, "
        "framerate = (fraction) [0/1, MAX], "
        "width = (int) [ 1, MAX ], height = (int) [ 1, MAX ], "
        "stream-format = (string) byte-stream , alignment = (string) au , "
        "profile = (string) { high, main, baseline, constrained-baseline }")
    );

#define gst_msdkh264enc_parent_class parent_class
G_DEFINE_TYPE (GstMsdkH264Enc, gst_msdkh264enc, GST_TYPE_MSDKENC);

static gboolean
gst_msdkh264enc_set_format (GstMsdkEnc * encoder)
{
  GstMsdkH264Enc *thiz = GST_MSDKH264ENC (encoder);
  GstCaps *template_caps;
  GstCaps *allowed_caps = NULL;

  thiz->profile = 0;
  thiz->level = 0;

  template_caps = gst_static_pad_template_get_caps (&src_factory);
  allowed_caps = gst_pad_get_allowed_caps (GST_VIDEO_ENCODER_SRC_PAD (encoder));

  /* If downstream has ANY caps let encoder decide profile and level */
  if (allowed_caps == template_caps) {
    GST_INFO_OBJECT (thiz,
        "downstream has ANY caps, profile/level set to auto");
  } else if (allowed_caps) {
    GstStructure *s;
    const gchar *profile;
    const gchar *level;

    if (gst_caps_is_empty (allowed_caps)) {
      gst_caps_unref (allowed_caps);
      gst_caps_unref (template_caps);
      return FALSE;
    }

    allowed_caps = gst_caps_make_writable (allowed_caps);
    allowed_caps = gst_caps_fixate (allowed_caps);
    s = gst_caps_get_structure (allowed_caps, 0);

    profile = gst_structure_get_string (s, "profile");
    if (profile) {
      if (!strcmp (profile, "high")) {
        thiz->profile = MFX_PROFILE_AVC_HIGH;
      } else if (!strcmp (profile, "main")) {
        thiz->profile = MFX_PROFILE_AVC_MAIN;
      } else if (!strcmp (profile, "baseline")) {
        thiz->profile = MFX_PROFILE_AVC_BASELINE;
      } else if (!strcmp (profile, "constrained-baseline")) {
        thiz->profile = MFX_PROFILE_AVC_CONSTRAINED_BASELINE;
      } else {
        g_assert_not_reached ();
      }
    }

    level = gst_structure_get_string (s, "level");
    if (level) {
      thiz->level = gst_codec_utils_h264_get_level_idc (level);
    }

    gst_caps_unref (allowed_caps);
  }

  gst_caps_unref (template_caps);

  return TRUE;
}

static gboolean
gst_msdkh264enc_configure (GstMsdkEnc * encoder)
{
  GstMsdkH264Enc *thiz = GST_MSDKH264ENC (encoder);

  encoder->param.mfx.LowPower =
      (thiz->lowpower ? MFX_CODINGOPTION_ON : MFX_CODINGOPTION_OFF);
  encoder->param.mfx.CodecId = MFX_CODEC_AVC;
  encoder->param.mfx.CodecProfile = thiz->profile;
  encoder->param.mfx.CodecLevel = thiz->level;

  thiz->option.Header.BufferId = MFX_EXTBUFF_CODING_OPTION;
  thiz->option.Header.BufferSz = sizeof (thiz->option);
  if (thiz->profile == MFX_PROFILE_AVC_CONSTRAINED_BASELINE ||
      thiz->profile == MFX_PROFILE_AVC_BASELINE ||
      thiz->profile == MFX_PROFILE_AVC_EXTENDED) {
    thiz->option.CAVLC = MFX_CODINGOPTION_ON;
  } else {
    thiz->option.CAVLC =
        (thiz->cabac ? MFX_CODINGOPTION_OFF : MFX_CODINGOPTION_ON);
  }

  gst_msdkenc_add_extra_param (encoder, (mfxExtBuffer *) & thiz->option);

  return TRUE;
}

static inline const gchar *
profile_to_string (gint profile)
{
  switch (profile) {
    case MFX_PROFILE_AVC_HIGH:
      return "high";
    case MFX_PROFILE_AVC_MAIN:
      return "main";
    case MFX_PROFILE_AVC_BASELINE:
      return "baseline";
    case MFX_PROFILE_AVC_CONSTRAINED_BASELINE:
      return "constrained-baseline";
    default:
      break;
  }

  return NULL;
}

static inline const gchar *
level_to_string (gint level)
{
  switch (level) {
    case MFX_LEVEL_AVC_1:
      return "1";
    case MFX_LEVEL_AVC_1b:
      return "1.1";
    case MFX_LEVEL_AVC_11:
      return "1.1";
    case MFX_LEVEL_AVC_12:
      return "1.2";
    case MFX_LEVEL_AVC_13:
      return "1.3";
    case MFX_LEVEL_AVC_2:
      return "2";
    case MFX_LEVEL_AVC_21:
      return "2.1";
    case MFX_LEVEL_AVC_22:
      return "2.2";
    case MFX_LEVEL_AVC_3:
      return "3";
    case MFX_LEVEL_AVC_31:
      return "3.1";
    case MFX_LEVEL_AVC_32:
      return "3.2";
    case MFX_LEVEL_AVC_4:
      return "4";
    case MFX_LEVEL_AVC_41:
      return "4.1";
    case MFX_LEVEL_AVC_42:
      return "4.2";
    case MFX_LEVEL_AVC_5:
      return "5";
    case MFX_LEVEL_AVC_51:
      return "5.1";
    case MFX_LEVEL_AVC_52:
      return "5.2";
    default:
      break;
  }

  return NULL;
}

static GstCaps *
gst_msdkh264enc_set_src_caps (GstMsdkEnc * encoder)
{
  GstCaps *caps;
  GstStructure *structure;
  const gchar *profile;
  const gchar *level;

  caps = gst_caps_new_empty_simple ("video/x-h264");
  structure = gst_caps_get_structure (caps, 0);

  gst_structure_set (structure, "stream-format", G_TYPE_STRING, "byte-stream",
      NULL);

  gst_structure_set (structure, "alignment", G_TYPE_STRING, "au", NULL);

  profile = profile_to_string (encoder->param.mfx.CodecProfile);
  if (profile)
    gst_structure_set (structure, "profile", G_TYPE_STRING, profile, NULL);

  level = level_to_string (encoder->param.mfx.CodecLevel);
  if (level)
    gst_structure_set (structure, "level", G_TYPE_STRING, level, NULL);

  return caps;
}

static void
gst_msdkh264enc_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec)
{
  GstMsdkH264Enc *thiz = GST_MSDKH264ENC (object);
  GstState state;

  GST_OBJECT_LOCK (thiz);

  state = GST_STATE (thiz);
  if ((state != GST_STATE_READY && state != GST_STATE_NULL) &&
      !(pspec->flags & GST_PARAM_MUTABLE_PLAYING))
    goto wrong_state;

  switch (prop_id) {
    case PROP_CABAC:
      thiz->cabac = g_value_get_boolean (value);
      break;
    case PROP_LOW_POWER:
      thiz->lowpower = g_value_get_boolean (value);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
  GST_OBJECT_UNLOCK (thiz);
  return;

  /* ERROR */
wrong_state:
  {
    GST_WARNING_OBJECT (thiz, "setting property in wrong state");
    GST_OBJECT_UNLOCK (thiz);
  }
}

static void
gst_msdkh264enc_get_property (GObject * object, guint prop_id, GValue * value,
    GParamSpec * pspec)
{
  GstMsdkH264Enc *thiz = GST_MSDKH264ENC (object);

  GST_OBJECT_LOCK (thiz);
  switch (prop_id) {
    case PROP_CABAC:
      g_value_set_boolean (value, thiz->cabac);
      break;
    case PROP_LOW_POWER:
      g_value_set_boolean (value, thiz->lowpower);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
  GST_OBJECT_UNLOCK (thiz);
}

static void
gst_msdkh264enc_class_init (GstMsdkH264EncClass * klass)
{
  GObjectClass *gobject_class;
  GstElementClass *element_class;
  GstMsdkEncClass *encoder_class;

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

  gobject_class->set_property = gst_msdkh264enc_set_property;
  gobject_class->get_property = gst_msdkh264enc_get_property;

  encoder_class->set_format = gst_msdkh264enc_set_format;
  encoder_class->configure = gst_msdkh264enc_configure;
  encoder_class->set_src_caps = gst_msdkh264enc_set_src_caps;

  g_object_class_install_property (gobject_class, PROP_CABAC,
      g_param_spec_boolean ("cabac", "CABAC", "Enable CABAC entropy coding",
          PROP_CABAC_DEFAULT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (gobject_class, PROP_LOW_POWER,
      g_param_spec_boolean ("low-power", "Low power", "Enable low power mode",
          PROP_LOWPOWER_DEFAULT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  gst_element_class_set_static_metadata (element_class,
      "Intel MSDK H264 encoder",
      "Codec/Encoder/Video",
      "H264 video encoder based on Intel Media SDK",
      "Josep Torra <jtorra@oblong.com>");

  gst_element_class_add_static_pad_template (element_class, &src_factory);
}

static void
gst_msdkh264enc_init (GstMsdkH264Enc * thiz)
{
  thiz->cabac = PROP_CABAC_DEFAULT;
  thiz->lowpower = PROP_LOWPOWER_DEFAULT;
}