/* GStreamer
 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
 *
 * 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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstcolorspace.h"
#include <gst/gst.h>
#include <gst/video/video.h>

#include "yuv2rgb.h"


static GstColorspaceFormat gst_colorspace_formats[] = {
  {GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("I420"))},
  {GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("YV12"))},
  {GST_STATIC_CAPS (GST_VIDEO_CAPS_xRGB)},
  {GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB)},
  {GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB_16)},
};

static GstColorspaceConverter gst_colorspace_converters[] = {
  {GST_COLORSPACE_I420, GST_COLORSPACE_RGB32, gst_colorspace_I420_to_rgb32},
  {GST_COLORSPACE_YV12, GST_COLORSPACE_RGB32, gst_colorspace_YV12_to_rgb32},
  {GST_COLORSPACE_I420, GST_COLORSPACE_RGB24, gst_colorspace_I420_to_rgb24},
  {GST_COLORSPACE_YV12, GST_COLORSPACE_RGB24, gst_colorspace_YV12_to_rgb24},
  {GST_COLORSPACE_I420, GST_COLORSPACE_RGB16, gst_colorspace_I420_to_rgb16},
  {GST_COLORSPACE_YV12, GST_COLORSPACE_RGB16, gst_colorspace_YV12_to_rgb16},
};

static const GstElementDetails colorspace_details =
GST_ELEMENT_DETAILS ("Colorspace converter",
    "Filter/Converter/Video",
    "Converts video from YUV to RGB",
    "Wim Taymans <wim.taymans@chello.be>");

static GstStaticPadTemplate gst_colorspace_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
    GST_PAD_SINK,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("{ I420, YV12 }"))
    );

static GstStaticPadTemplate gst_colorspace_src_template =
    GST_STATIC_PAD_TEMPLATE ("src",
    GST_PAD_SRC,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS (GST_VIDEO_CAPS_xRGB "; "
        GST_VIDEO_CAPS_RGB "; " GST_VIDEO_CAPS_RGB_16)
    );

/* Stereo signals and args */
enum
{
  /* FILL ME */
  LAST_SIGNAL
};

enum
{
  ARG_0,
  ARG_SOURCE,
  ARG_DEST
};

static void gst_colorspace_base_init (gpointer g_class);
static void gst_colorspace_class_init (GstColorspaceClass * klass);
static void gst_colorspace_init (GstColorspace * space);

static void gst_colorspace_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec);
static void gst_colorspace_get_property (GObject * object, guint prop_id,
    GValue * value, GParamSpec * pspec);

static GstPadLinkReturn
gst_colorspace_link (GstPad * pad, const GstCaps * caps);
static void gst_colorspace_chain (GstPad * pad, GstData * _data);
static GstStateChangeReturn gst_colorspace_change_state (GstElement * element,
    GstStateChange transition);


static GstElementClass *parent_class = NULL;

/*static guint gst_colorspace_signals[LAST_SIGNAL] = { 0 }; */

#if 0
static gboolean
colorspace_setup_converter (GstColorspace * space, GstCaps * from_caps,
    GstCaps * to_caps)
{
  guint32 from_space, to_space;
  GstStructure *from_struct;
  GstStructure *to_struct;

  g_return_val_if_fail (to_caps != NULL, FALSE);
  g_return_val_if_fail (from_caps != NULL, FALSE);

  from_struct = gst_caps_get_structure (from_caps, 0);
  to_struct = gst_caps_get_structure (to_caps, 0);

  from_space = GST_MAKE_FOURCC ('R', 'G', 'B', ' ');
  gst_structure_get_fourcc (from_struct, "format", &from_space);

  to_space = GST_MAKE_FOURCC ('R', 'G', 'B', ' ');
  gst_structure_get_fourcc (to_struct, "format", &to_space);

  GST_INFO ("set up converter for " GST_FOURCC_FORMAT
      " (%08x) to " GST_FOURCC_FORMAT " (%08x)",
      GST_FOURCC_ARGS (from_space), from_space,
      GST_FOURCC_ARGS (to_space), to_space);

  switch (from_space) {
    case GST_MAKE_FOURCC ('R', 'G', 'B', ' '):
    {
      gint from_bpp;

      gst_structure_get_int (from_struct, "bpp", &from_bpp);

      switch (to_space) {
        case GST_MAKE_FOURCC ('R', 'G', 'B', ' '):
#ifdef HAVE_HERMES
        {
          gint to_bpp;

          gst_structure_get_int (to_struct, "bpp", &to_bpp);

          gst_structure_get_int (from_struct, "red_mask", &space->source.r);
          gst_structure_get_int (from_struct, "green_mask", &space->source.g);
          gst_structure_get_int (from_struct, "blue_mask", &space->source.b);
          space->source.a = 0;
          space->srcbpp = space->source.bits = from_bpp;
          space->source.indexed = 0;
          space->source.has_colorkey = 0;

          GST_INFO ("source red mask   %08x", space->source.r);
          GST_INFO ("source green mask %08x", space->source.g);
          GST_INFO ("source blue mask  %08x", space->source.b);
          GST_INFO ("source bpp        %08x", space->srcbpp);

          gst_structure_get_int (to_struct, "red_mask", &space->dest.r);
          gst_structure_get_int (to_struct, "green_mask", &space->dest.g);
          gst_structure_get_int (to_struct, "blue_mask", &space->dest.b);
          space->dest.a = 0;
          space->destbpp = space->dest.bits = to_bpp;
          space->dest.indexed = 0;
          space->dest.has_colorkey = 0;

          GST_INFO ("dest red mask   %08x", space->dest.r);
          GST_INFO ("dest green mask %08x", space->dest.g);
          GST_INFO ("dest blue mask  %08x", space->dest.b);
          GST_INFO ("dest bpp        %08x", space->destbpp);

          if (!Hermes_ConverterRequest (space->h_handle, &space->source,
                  &space->dest)) {
            g_warning ("Hermes: could not get converter\n");
            return FALSE;
          }
          GST_INFO ("converter set up");
          space->type = GST_COLORSPACE_HERMES;
          return TRUE;
        }
#else
          g_warning ("colorspace: compiled without hermes!");
          return FALSE;
#endif
        case GST_MAKE_FOURCC ('Y', 'V', '1', '2'):
          if (from_bpp == 32) {
            space->type = GST_COLORSPACE_RGB32_YV12;
            space->destbpp = 12;
            return TRUE;
          }
        case GST_MAKE_FOURCC ('I', '4', '2', '0'):
          if (from_bpp == 32) {
            space->type = GST_COLORSPACE_RGB32_I420;
            space->destbpp = 12;
            return TRUE;
          }
        case GST_MAKE_FOURCC ('Y', 'U', 'Y', '2'):
          GST_INFO ("colorspace: RGB to YUV with bpp %d not implemented!!",
              from_bpp);
          return FALSE;
      }
      break;
    }
    case GST_MAKE_FOURCC ('I', '4', '2', '0'):
      switch (to_space) {
        case GST_MAKE_FOURCC ('R', 'G', 'B', ' '):
          GST_INFO ("colorspace: YUV to RGB");

          gst_structure_get_int (to_struct, "bpp", &space->destbpp);
          space->converter =
              gst_colorspace_yuv2rgb_get_converter (from_caps, to_caps);
          space->type = GST_COLORSPACE_YUV_RGB;
          return TRUE;
        case GST_MAKE_FOURCC ('I', '4', '2', '0'):
          space->type = GST_COLORSPACE_NONE;
          space->destbpp = 12;
          return TRUE;
        case GST_MAKE_FOURCC ('Y', 'V', '1', '2'):
          space->type = GST_COLORSPACE_420_SWAP;
          space->destbpp = 12;
          return TRUE;

      }
      break;
    case GST_MAKE_FOURCC ('Y', 'U', 'Y', '2'):
      switch (to_space) {
        case GST_MAKE_FOURCC ('I', '4', '2', '0'):
          space->type = GST_COLORSPACE_YUY2_I420;
          space->destbpp = 12;
          return TRUE;
        case GST_MAKE_FOURCC ('Y', 'U', 'Y', '2'):
          space->type = GST_COLORSPACE_NONE;
          space->destbpp = 16;
          return TRUE;
        case GST_MAKE_FOURCC ('R', 'G', 'B', ' '):
          GST_INFO ("colorspace: YUY2 to RGB not implemented!!");
          return FALSE;
      }
      break;
    case GST_MAKE_FOURCC ('Y', 'V', '1', '2'):
      switch (to_space) {
        case GST_MAKE_FOURCC ('R', 'G', 'B', ' '):
          GST_INFO ("colorspace: YV12 to RGB");

          gst_structure_get_int (to_struct, "bpp", &space->destbpp);
          space->converter =
              gst_colorspace_yuv2rgb_get_converter (from_caps, to_caps);
          space->type = GST_COLORSPACE_YUV_RGB;
          return TRUE;
        case GST_MAKE_FOURCC ('I', '4', '2', '0'):
          space->type = GST_COLORSPACE_420_SWAP;
          space->destbpp = 12;
          return TRUE;
        case GST_MAKE_FOURCC ('Y', 'V', '1', '2'):
          space->type = GST_COLORSPACE_NONE;
          space->destbpp = 12;
          return TRUE;
      }
      break;
  }
  return FALSE;
}
#endif

static GstCaps *
gst_colorspace_caps_remove_format_info (GstCaps * caps, const char *media_type)
{
  int i;
  GstStructure *structure;

  for (i = 0; i < gst_caps_get_size (caps); i++) {
    structure = gst_caps_get_structure (caps, i);

    gst_structure_set_name (structure, media_type);
    gst_structure_remove_field (structure, "format");
    gst_structure_remove_field (structure, "endianness");
    gst_structure_remove_field (structure, "depth");
    gst_structure_remove_field (structure, "bpp");
    gst_structure_remove_field (structure, "red_mask");
    gst_structure_remove_field (structure, "green_mask");
    gst_structure_remove_field (structure, "blue_mask");
  }

  gst_caps_do_simplify (caps);
  return caps;
}

static GstCaps *
gst_colorspace_getcaps (GstPad * pad)
{
  GstColorspace *space;
  GstPad *otherpad;
  GstCaps *othercaps;
  GstCaps *caps;

  space = GST_COLORSPACE (gst_pad_get_parent (pad));

  otherpad = (pad == space->srcpad) ? space->sinkpad : space->srcpad;

  othercaps = gst_pad_get_allowed_caps (otherpad);

  othercaps = gst_colorspace_caps_remove_format_info (othercaps,
      (pad == space->srcpad) ? "video/x-raw-rgb" : "video/x-raw-yuv");

  caps = gst_caps_intersect (othercaps, gst_pad_get_pad_template_caps (pad));
  gst_caps_free (othercaps);

  return caps;
}

static GstColorSpaceFormatType
gst_colorspace_get_format (const GstCaps * caps)
{
  int i;

  for (i = 0; i < G_N_ELEMENTS (gst_colorspace_formats); i++) {
    GstCaps *icaps;
    GstCaps *fcaps;

    fcaps =
        gst_caps_copy (gst_static_caps_get (&gst_colorspace_formats[i].caps));

    icaps = gst_caps_intersect (caps, fcaps);
    if (!gst_caps_is_empty (icaps)) {
      gst_caps_free (icaps);
      return i;
    }
    gst_caps_free (icaps);
  }

  g_assert_not_reached ();
  return -1;
}

#define ROUND_UP_2(x)  (((x)+1)&~1)
#define ROUND_UP_4(x)  (((x)+3)&~3)
#define ROUND_UP_8(x)  (((x)+7)&~7)

static int
gst_colorspace_format_get_size (GstColorSpaceFormatType index, int width,
    int height)
{
  int size;

  switch (index) {
    case GST_COLORSPACE_I420:
    case GST_COLORSPACE_YV12:
      size = ROUND_UP_4 (width) * ROUND_UP_2 (height);
      size += ROUND_UP_8 (width) / 2 * ROUND_UP_2 (height) / 2;
      size += ROUND_UP_8 (width) / 2 * ROUND_UP_2 (height) / 2;
      return size;
      break;
    case GST_COLORSPACE_RGB32:
      return width * height * 4;
      break;
    case GST_COLORSPACE_RGB24:
      return ROUND_UP_4 (width * 3) * height;
      break;
    case GST_COLORSPACE_RGB16:
      return ROUND_UP_4 (width * 2) * height;
      break;
  }

  g_assert_not_reached ();
  return 0;
}

static int
gst_colorspace_get_converter (GstColorSpaceFormatType from,
    GstColorSpaceFormatType to)
{
  int i;

  for (i = 0; i < G_N_ELEMENTS (gst_colorspace_converters); i++) {
    GstColorspaceConverter *converter = gst_colorspace_converters + i;

    if (from == converter->from && to == converter->to) {
      return i;
    }
  }
  g_assert_not_reached ();
  return -1;
}

static GstPadLinkReturn
gst_colorspace_link (GstPad * pad, const GstCaps * caps)
{
  GstColorspace *space;
  GstPad *otherpad;
  GstStructure *structure;
  GstPadLinkReturn link_ret;
  int width, height;
  double fps;
  int format_index;

  space = GST_COLORSPACE (gst_pad_get_parent (pad));
  otherpad = (pad == space->sinkpad) ? space->srcpad : space->sinkpad;

  link_ret = gst_pad_try_set_caps (otherpad, caps);
  if (link_ret == GST_PAD_LINK_OK) {
    return link_ret;
  }

  structure = gst_caps_get_structure (caps, 0);

  format_index = gst_colorspace_get_format (caps);
  g_print ("format index is %d\n", format_index);

  gst_structure_get_int (structure, "width", &width);
  gst_structure_get_int (structure, "height", &height);
  gst_structure_get_double (structure, "framerate", &fps);

  GST_INFO ("size: %dx%d", space->width, space->height);

  if (gst_pad_is_negotiated (otherpad)) {
    GstCaps *othercaps;

    othercaps = gst_caps_copy (gst_pad_get_negotiated_caps (otherpad));

    gst_caps_set_simple (othercaps,
        "width", G_TYPE_INT, width,
        "height", G_TYPE_INT, height, "framerate", G_TYPE_DOUBLE, fps, NULL);

    link_ret = gst_pad_try_set_caps (otherpad, othercaps);
    if (link_ret != GST_PAD_LINK_OK) {
      return link_ret;
    }
  }

  if (pad == space->srcpad) {
    space->src_format_index = format_index;
  } else {
    space->sink_format_index = format_index;
  }

  if (gst_pad_is_negotiated (otherpad)) {
    space->converter_index =
        gst_colorspace_get_converter (space->sink_format_index,
        space->src_format_index);

    g_print ("using index %d\n", space->converter_index);

    space->sink_size = gst_colorspace_format_get_size (space->sink_format_index,
        width, height);
    space->src_size = gst_colorspace_format_get_size (space->src_format_index,
        width, height);
    space->width = width;
    space->height = height;
    space->fps = fps;
  }
#if 0
  if (gst_pad_is_negotiated (otherpad)) {
    g_warning ("could not get converter\n");
    return GST_PAD_LINK_REFUSED;
  }
#endif

  return GST_PAD_LINK_OK;
}

GType
gst_colorspace_get_type (void)
{
  static GType colorspace_type = 0;

  if (!colorspace_type) {
    static const GTypeInfo colorspace_info = {
      sizeof (GstColorspaceClass),
      gst_colorspace_base_init,
      NULL,
      (GClassInitFunc) gst_colorspace_class_init,
      NULL,
      NULL,
      sizeof (GstColorspace),
      0,
      (GInstanceInitFunc) gst_colorspace_init,
    };

    colorspace_type =
        g_type_register_static (GST_TYPE_ELEMENT, "GstColorspace",
        &colorspace_info, 0);
  }
  return colorspace_type;
}

static void
gst_colorspace_base_init (gpointer g_class)
{
  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);

  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&gst_colorspace_src_template));
  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&gst_colorspace_sink_template));

  gst_element_class_set_details (element_class, &colorspace_details);
}

static void
gst_colorspace_class_init (GstColorspaceClass * klass)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;

  gobject_class = (GObjectClass *) klass;
  gstelement_class = (GstElementClass *) klass;

  parent_class = g_type_class_peek_parent (klass);

  gobject_class->set_property = gst_colorspace_set_property;
  gobject_class->get_property = gst_colorspace_get_property;

  gstelement_class->change_state = gst_colorspace_change_state;

  gst_colorspace_table_init (NULL);
}

static void
gst_colorspace_init (GstColorspace * space)
{
  space->sinkpad =
      gst_pad_new_from_static_template (&gst_colorspace_sink_template, "sink");
  gst_pad_set_link_function (space->sinkpad, gst_colorspace_link);
  gst_pad_set_getcaps_function (space->sinkpad, gst_colorspace_getcaps);
  gst_pad_set_chain_function (space->sinkpad, gst_colorspace_chain);
  gst_element_add_pad (GST_ELEMENT (space), space->sinkpad);

  space->srcpad =
      gst_pad_new_from_static_template (&gst_colorspace_src_template, "src");
  gst_element_add_pad (GST_ELEMENT (space), space->srcpad);
  gst_pad_set_link_function (space->srcpad, gst_colorspace_link);
}

static void
gst_colorspace_chain (GstPad * pad, GstData * _data)
{
  GstBuffer *buf = GST_BUFFER (_data);
  GstColorspace *space;
  GstBuffer *outbuf = NULL;
  GstColorspaceConverter *converter;

  g_return_if_fail (pad != NULL);
  g_return_if_fail (GST_IS_PAD (pad));
  g_return_if_fail (buf != NULL);

  space = GST_COLORSPACE (gst_pad_get_parent (pad));

  g_return_if_fail (space != NULL);
  g_return_if_fail (GST_IS_COLORSPACE (space));

  if (GST_BUFFER_SIZE (buf) < space->sink_size) {
    g_critical ("input size is smaller than expected");
  }

  outbuf =
      gst_pad_alloc_buffer_and_set_caps (space->srcpad, GST_BUFFER_OFFSET_NONE,
      space->src_size);

  converter = gst_colorspace_converters + space->converter_index;
  converter->convert (space, GST_BUFFER_DATA (outbuf), GST_BUFFER_DATA (buf));

  GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buf);
  GST_BUFFER_DURATION (outbuf) = GST_BUFFER_DURATION (buf);

  gst_buffer_unref (buf);
  gst_pad_push (space->srcpad, GST_DATA (outbuf));
}

static GstStateChangeReturn
gst_colorspace_change_state (GstElement * element, GstStateChange transition)
{
  GstColorspace *space;

  space = GST_COLORSPACE (element);

  switch (transition) {
    case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
      break;
    case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
      break;
    case GST_STATE_CHANGE_PAUSED_TO_READY:
      break;
  }

  return parent_class->change_state (element, transition);
}

static void
gst_colorspace_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec)
{
  GstColorspace *space;

  g_return_if_fail (GST_IS_COLORSPACE (object));
  space = GST_COLORSPACE (object);

  switch (prop_id) {
    default:
      break;
  }
}

static void
gst_colorspace_get_property (GObject * object, guint prop_id, GValue * value,
    GParamSpec * pspec)
{
  GstColorspace *space;

  g_return_if_fail (GST_IS_COLORSPACE (object));
  space = GST_COLORSPACE (object);

  switch (prop_id) {
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static gboolean
plugin_init (GstPlugin * plugin)
{
  if (!gst_element_register (plugin, "colorspace", GST_RANK_PRIMARY - 1,
          GST_TYPE_COLORSPACE))
    return FALSE;

  return TRUE;
}

GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
    GST_VERSION_MINOR,
    "yuvtorgbcolorspace",
    "YUV to RGB colorspace converter",
    plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)