/* GStreamer
 * Copyright (C) <2007> Wim Taymans <wim@fluendo.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 Street, Suite 500,
 * Boston, MA 02110-1335, USA.
 */
/**
 * SECTION:element-simplevideomark
 * @see_also: #GstVideoDetect
 *
 * This plugin produces #GstSimpleVideoMark::pattern-count squares in the bottom left
 * corner of the video frames. The squares have a width and height of 
 * respectively #GstSimpleVideoMark:pattern-width and #GstSimpleVideoMark:pattern-height.
 * Even squares will be black and odd squares will be white.
 * 
 * After writing the pattern, #GstSimpleVideoMark:pattern-data-count squares after the
 * pattern squares are produced as the bitarray given in
 * #GstSimpleVideoMark:pattern-data. 1 bits will produce white squares and 0 bits will
 * produce black squares.
 * 
 * The element can be enabled with the #GstSimpleVideoMark:enabled property. It is
 * mostly used together with the #GstVideoDetect plugin.
 * 
 * <refsect2>
 * <title>Example launch line</title>
 * |[
 * gst-launch videotestsrc ! simplevideomark ! ximagesink
 * ]| Add the default black/white squares at the bottom left of the video frames.
 * </refsect2>
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <gst/gst.h>
#include <gst/video/video.h>
#include <gst/video/gstvideofilter.h>
#include "gstsimplevideomark.h"

GST_DEBUG_CATEGORY_STATIC (gst_video_mark_debug_category);
#define GST_CAT_DEFAULT gst_video_mark_debug_category

/* prototypes */


static void gst_video_mark_set_property (GObject * object,
    guint property_id, const GValue * value, GParamSpec * pspec);
static void gst_video_mark_get_property (GObject * object,
    guint property_id, GValue * value, GParamSpec * pspec);
static void gst_video_mark_dispose (GObject * object);
static void gst_video_mark_finalize (GObject * object);

static gboolean gst_video_mark_start (GstBaseTransform * trans);
static gboolean gst_video_mark_stop (GstBaseTransform * trans);
static gboolean gst_video_mark_set_info (GstVideoFilter * filter,
    GstCaps * incaps, GstVideoInfo * in_info, GstCaps * outcaps,
    GstVideoInfo * out_info);
static GstFlowReturn gst_video_mark_transform_frame_ip (GstVideoFilter * filter,
    GstVideoFrame * frame);

enum
{
  PROP_0,
  PROP_PATTERN_WIDTH,
  PROP_PATTERN_HEIGHT,
  PROP_PATTERN_COUNT,
  PROP_PATTERN_DATA_COUNT,
  PROP_PATTERN_DATA,
  PROP_ENABLED,
  PROP_LEFT_OFFSET,
  PROP_BOTTOM_OFFSET
};

#define DEFAULT_PATTERN_WIDTH        4
#define DEFAULT_PATTERN_HEIGHT       16
#define DEFAULT_PATTERN_COUNT        4
#define DEFAULT_PATTERN_DATA_COUNT   5
#define DEFAULT_PATTERN_DATA         10
#define DEFAULT_ENABLED              TRUE
#define DEFAULT_LEFT_OFFSET          0
#define DEFAULT_BOTTOM_OFFSET        0

/* pad templates */

#define VIDEO_CAPS \
    GST_VIDEO_CAPS_MAKE( \
        "{ I420, YV12, Y41B, Y42B, Y444, YUY2, UYVY, AYUV, YVYU }")


/* class initialization */

G_DEFINE_TYPE_WITH_CODE (GstSimpleVideoMark, gst_video_mark,
    GST_TYPE_VIDEO_FILTER,
    GST_DEBUG_CATEGORY_INIT (gst_video_mark_debug_category, "simplevideomark",
        0, "debug category for simplevideomark element"));

static void
gst_video_mark_class_init (GstSimpleVideoMarkClass * klass)
{
  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
  GstBaseTransformClass *base_transform_class =
      GST_BASE_TRANSFORM_CLASS (klass);
  GstVideoFilterClass *video_filter_class = GST_VIDEO_FILTER_CLASS (klass);

  gst_element_class_add_pad_template (GST_ELEMENT_CLASS (klass),
      gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
          gst_caps_from_string (VIDEO_CAPS)));
  gst_element_class_add_pad_template (GST_ELEMENT_CLASS (klass),
      gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
          gst_caps_from_string (VIDEO_CAPS)));

  gst_element_class_set_static_metadata (GST_ELEMENT_CLASS (klass),
      "Video marker", "Filter/Effect/Video",
      "Marks a video signal with a pattern", "Wim Taymans <wim@fluendo.com>");

  gobject_class->set_property = gst_video_mark_set_property;
  gobject_class->get_property = gst_video_mark_get_property;
  gobject_class->dispose = gst_video_mark_dispose;
  gobject_class->finalize = gst_video_mark_finalize;
  base_transform_class->start = GST_DEBUG_FUNCPTR (gst_video_mark_start);
  base_transform_class->stop = GST_DEBUG_FUNCPTR (gst_video_mark_stop);
  video_filter_class->set_info = GST_DEBUG_FUNCPTR (gst_video_mark_set_info);
  video_filter_class->transform_frame_ip =
      GST_DEBUG_FUNCPTR (gst_video_mark_transform_frame_ip);

  g_object_class_install_property (gobject_class, PROP_PATTERN_WIDTH,
      g_param_spec_int ("pattern-width", "Pattern width",
          "The width of the pattern markers", 1, G_MAXINT,
          DEFAULT_PATTERN_WIDTH,
          G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_PATTERN_HEIGHT,
      g_param_spec_int ("pattern-height", "Pattern height",
          "The height of the pattern markers", 1, G_MAXINT,
          DEFAULT_PATTERN_HEIGHT,
          G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_PATTERN_COUNT,
      g_param_spec_int ("pattern-count", "Pattern count",
          "The number of pattern markers", 0, G_MAXINT,
          DEFAULT_PATTERN_COUNT,
          G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_PATTERN_DATA_COUNT,
      g_param_spec_int ("pattern-data-count", "Pattern data count",
          "The number of extra data pattern markers", 0, 64,
          DEFAULT_PATTERN_DATA_COUNT,
          G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_PATTERN_DATA,
      g_param_spec_uint64 ("pattern-data", "Pattern data",
          "The extra data pattern markers", 0, G_MAXUINT64,
          DEFAULT_PATTERN_DATA,
          G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_ENABLED,
      g_param_spec_boolean ("enabled", "Enabled",
          "Enable or disable the filter",
          DEFAULT_ENABLED,
          G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_LEFT_OFFSET,
      g_param_spec_int ("left-offset", "Left Offset",
          "The offset from the left border where the pattern starts", 0,
          G_MAXINT, DEFAULT_LEFT_OFFSET,
          G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_BOTTOM_OFFSET,
      g_param_spec_int ("bottom-offset", "Bottom Offset",
          "The offset from the bottom border where the pattern starts", 0,
          G_MAXINT, DEFAULT_BOTTOM_OFFSET,
          G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));

}

static void
gst_video_mark_init (GstSimpleVideoMark * simplevideomark)
{
}

void
gst_video_mark_set_property (GObject * object, guint property_id,
    const GValue * value, GParamSpec * pspec)
{
  GstSimpleVideoMark *simplevideomark = GST_SIMPLE_VIDEO_MARK (object);

  GST_DEBUG_OBJECT (simplevideomark, "set_property");

  switch (property_id) {
    case PROP_PATTERN_WIDTH:
      simplevideomark->pattern_width = g_value_get_int (value);
      break;
    case PROP_PATTERN_HEIGHT:
      simplevideomark->pattern_height = g_value_get_int (value);
      break;
    case PROP_PATTERN_COUNT:
      simplevideomark->pattern_count = g_value_get_int (value);
      break;
    case PROP_PATTERN_DATA_COUNT:
      simplevideomark->pattern_data_count = g_value_get_int (value);
      break;
    case PROP_PATTERN_DATA:
      simplevideomark->pattern_data = g_value_get_uint64 (value);
      break;
    case PROP_ENABLED:
      simplevideomark->enabled = g_value_get_boolean (value);
      break;
    case PROP_LEFT_OFFSET:
      simplevideomark->left_offset = g_value_get_int (value);
      break;
    case PROP_BOTTOM_OFFSET:
      simplevideomark->bottom_offset = g_value_get_int (value);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
      break;
  }
}

void
gst_video_mark_get_property (GObject * object, guint property_id,
    GValue * value, GParamSpec * pspec)
{
  GstSimpleVideoMark *simplevideomark = GST_SIMPLE_VIDEO_MARK (object);

  GST_DEBUG_OBJECT (simplevideomark, "get_property");

  switch (property_id) {
    case PROP_PATTERN_WIDTH:
      g_value_set_int (value, simplevideomark->pattern_width);
      break;
    case PROP_PATTERN_HEIGHT:
      g_value_set_int (value, simplevideomark->pattern_height);
      break;
    case PROP_PATTERN_COUNT:
      g_value_set_int (value, simplevideomark->pattern_count);
      break;
    case PROP_PATTERN_DATA_COUNT:
      g_value_set_int (value, simplevideomark->pattern_data_count);
      break;
    case PROP_PATTERN_DATA:
      g_value_set_uint64 (value, simplevideomark->pattern_data);
      break;
    case PROP_ENABLED:
      g_value_set_boolean (value, simplevideomark->enabled);
      break;
    case PROP_LEFT_OFFSET:
      g_value_set_int (value, simplevideomark->left_offset);
      break;
    case PROP_BOTTOM_OFFSET:
      g_value_set_int (value, simplevideomark->bottom_offset);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
      break;
  }
}

void
gst_video_mark_dispose (GObject * object)
{
  GstSimpleVideoMark *simplevideomark = GST_SIMPLE_VIDEO_MARK (object);

  GST_DEBUG_OBJECT (simplevideomark, "dispose");

  /* clean up as possible.  may be called multiple times */

  G_OBJECT_CLASS (gst_video_mark_parent_class)->dispose (object);
}

void
gst_video_mark_finalize (GObject * object)
{
  GstSimpleVideoMark *simplevideomark = GST_SIMPLE_VIDEO_MARK (object);

  GST_DEBUG_OBJECT (simplevideomark, "finalize");

  /* clean up object here */

  G_OBJECT_CLASS (gst_video_mark_parent_class)->finalize (object);
}

static gboolean
gst_video_mark_start (GstBaseTransform * trans)
{
  GstSimpleVideoMark *simplevideomark = GST_SIMPLE_VIDEO_MARK (trans);

  GST_DEBUG_OBJECT (simplevideomark, "start");

  return TRUE;
}

static gboolean
gst_video_mark_stop (GstBaseTransform * trans)
{
  GstSimpleVideoMark *simplevideomark = GST_SIMPLE_VIDEO_MARK (trans);

  GST_DEBUG_OBJECT (simplevideomark, "stop");

  return TRUE;
}

static gboolean
gst_video_mark_set_info (GstVideoFilter * filter, GstCaps * incaps,
    GstVideoInfo * in_info, GstCaps * outcaps, GstVideoInfo * out_info)
{
  GstSimpleVideoMark *simplevideomark = GST_SIMPLE_VIDEO_MARK (filter);

  GST_DEBUG_OBJECT (simplevideomark, "set_info");

  return TRUE;
}

static void
gst_video_mark_draw_box (GstSimpleVideoMark * simplevideomark, guint8 * data,
    gint width, gint height, gint row_stride, gint pixel_stride, guint8 color)
{
  gint i, j;

  for (i = 0; i < height; i++) {
    for (j = 0; j < width; j++) {
      data[pixel_stride * j] = color;
    }
    data += row_stride;
  }
}

static gint
calculate_pw (gint pw, gint x, gint width)
{
  if (x < 0)
    pw += x;
  else if ((x + pw) > width)
    pw = width - x;

  return pw;
}

static GstFlowReturn
gst_video_mark_yuv (GstSimpleVideoMark * simplevideomark, GstVideoFrame * frame)
{
  gint i, pw, ph, row_stride, pixel_stride;
  gint width, height, offset_calc, x, y;
  guint8 *d;
  guint64 pattern_shift;
  guint8 color;
  gint total_pattern;

  width = frame->info.width;
  height = frame->info.height;

  pw = simplevideomark->pattern_width;
  ph = simplevideomark->pattern_height;
  row_stride = GST_VIDEO_FRAME_COMP_STRIDE (frame, 0);
  pixel_stride = GST_VIDEO_FRAME_COMP_PSTRIDE (frame, 0);

  d = GST_VIDEO_FRAME_COMP_DATA (frame, 0);
  offset_calc =
      row_stride * (height - ph - simplevideomark->bottom_offset) +
      pixel_stride * simplevideomark->left_offset;
  x = simplevideomark->left_offset;
  y = height - ph - simplevideomark->bottom_offset;

  total_pattern =
      simplevideomark->pattern_count + simplevideomark->pattern_data_count;
  /* If x and y offset values are outside the video, no need to draw */
  if ((x + (pw * total_pattern)) < 0 || x > width || (y + height) < 0
      || y > height) {
    GST_ERROR_OBJECT (simplevideomark,
        "simplevideomark pattern is outside the video. Not drawing.");
    return GST_FLOW_OK;
  }

  /* Offset calculation less than 0, then reset to 0 */
  if (offset_calc < 0)
    offset_calc = 0;
  /* Y position of mark is negative or pattern exceeds the video height,
     then recalculate pattern height for partial display */
  if (y < 0)
    ph += y;
  else if ((y + ph) > height)
    ph = height - y;
  /* If pattern height is less than 0, need not draw anything */
  if (ph < 0)
    return GST_FLOW_OK;

  /* move to start of bottom left */
  d += offset_calc;

  /* draw the bottom left pixels */
  for (i = 0; i < simplevideomark->pattern_count; i++) {
    gint draw_pw;

    if (i & 1)
      /* odd pixels must be white */
      color = 255;
    else
      color = 0;

    /* X position of mark is negative or pattern exceeds the video width,
       then recalculate pattern width for partial display */
    draw_pw = calculate_pw (pw, x, width);
    /* If pattern width is less than 0, continue with the next pattern */
    if (draw_pw < 0)
      continue;

    /* draw box of width * height */
    gst_video_mark_draw_box (simplevideomark, d, draw_pw, ph, row_stride,
        pixel_stride, color);

    /* move to i-th pattern */
    d += pixel_stride * draw_pw;
    x += draw_pw;

    if ((x + (pw * (total_pattern - i - 1))) < 0 || x >= width)
      return GST_FLOW_OK;
  }

  pattern_shift =
      G_GUINT64_CONSTANT (1) << (simplevideomark->pattern_data_count - 1);

  /* get the data of the pattern */
  for (i = 0; i < simplevideomark->pattern_data_count; i++) {
    gint draw_pw;
    if (simplevideomark->pattern_data & pattern_shift)
      color = 255;
    else
      color = 0;

    /* X position of mark is negative or pattern exceeds the video width,
       then recalculate pattern width for partial display */
    draw_pw = calculate_pw (pw, x, width);
    /* If pattern width is less than 0, continue with the next pattern */
    if (draw_pw < 0)
      continue;

    gst_video_mark_draw_box (simplevideomark, d, draw_pw, ph, row_stride,
        pixel_stride, color);

    pattern_shift >>= 1;

    /* move to i-th pattern data */
    d += pixel_stride * draw_pw;
    x += draw_pw;

    if ((x + (pw * (simplevideomark->pattern_data_count - i - 1))) < 0
        || x >= width)
      return GST_FLOW_OK;
  }

  return GST_FLOW_OK;
}


static GstFlowReturn
gst_video_mark_transform_frame_ip (GstVideoFilter * filter,
    GstVideoFrame * frame)
{
  GstSimpleVideoMark *simplevideomark = GST_SIMPLE_VIDEO_MARK (filter);

  GST_DEBUG_OBJECT (simplevideomark, "transform_frame_ip");

  if (simplevideomark->enabled)
    return gst_video_mark_yuv (simplevideomark, frame);

  return GST_FLOW_OK;
}