/*

 * GStreamer

 * Copyright (C) 2012-2014 Matthew Waters <ystree00@gmail.com>

 * Copyright (C) 2015 Matthew Waters <matthew@centricular.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.

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <gst/gl/gl.h>

#include "gstglcolorconvertelement.h"

GST_DEBUG_CATEGORY_STATIC (gst_gl_color_convert_element_debug);

#define GST_CAT_DEFAULT gst_gl_color_convert_element_debug

G_DEFINE_TYPE_WITH_CODE (GstGLColorConvertElement, gst_gl_color_convert_element,

    GST_TYPE_GL_BASE_FILTER,

    GST_DEBUG_CATEGORY_INIT (gst_gl_color_convert_element_debug,

        "glconvertelement", 0, "convert");

    );

static gboolean gst_gl_color_convert_element_set_caps (GstBaseTransform * bt,

    GstCaps * in_caps, GstCaps * out_caps);

static GstCaps *gst_gl_color_convert_element_transform_caps (GstBaseTransform *

    bt, GstPadDirection direction, GstCaps * caps, GstCaps * filter);

static gboolean gst_gl_color_convert_element_get_unit_size (GstBaseTransform *

    trans, GstCaps * caps, gsize * size);

static gboolean

gst_gl_color_convert_element_filter_meta (GstBaseTransform * trans,

    GstQuery * query, GType api, const GstStructure * params);

static gboolean gst_gl_color_convert_element_decide_allocation (GstBaseTransform

    * trans, GstQuery * query);

static GstFlowReturn

gst_gl_color_convert_element_prepare_output_buffer (GstBaseTransform * bt,

    GstBuffer * inbuf, GstBuffer ** outbuf);

static GstFlowReturn gst_gl_color_convert_element_transform (GstBaseTransform *

    bt, GstBuffer * inbuf, GstBuffer * outbuf);

static GstCaps *gst_gl_color_convert_element_fixate_caps (GstBaseTransform *

    bt, GstPadDirection direction, GstCaps * caps, GstCaps * othercaps);

static GstStaticPadTemplate gst_gl_color_convert_element_src_pad_template =

GST_STATIC_PAD_TEMPLATE ("src",

    GST_PAD_SRC,

    GST_PAD_ALWAYS,

    GST_STATIC_CAPS (GST_GL_COLOR_CONVERT_VIDEO_CAPS));

static GstStaticPadTemplate gst_gl_color_convert_element_sink_pad_template =

GST_STATIC_PAD_TEMPLATE ("sink",

    GST_PAD_SINK,

    GST_PAD_ALWAYS,

    GST_STATIC_CAPS (GST_GL_COLOR_CONVERT_VIDEO_CAPS));

static gboolean

gst_gl_color_convert_element_stop (GstBaseTransform * bt)

{

  GstGLColorConvertElement *convert = GST_GL_COLOR_CONVERT_ELEMENT (bt);

  if (convert->convert) {

    gst_object_unref (convert->convert);

    convert->convert = NULL;

  }

  gst_caps_replace (&convert->in_caps, NULL);

  gst_caps_replace (&convert->out_caps, NULL);

  return

      GST_BASE_TRANSFORM_CLASS (gst_gl_color_convert_element_parent_class)->stop

      (bt);

}

static void

gst_gl_color_convert_element_class_init (GstGLColorConvertElementClass * klass)

{

  GstBaseTransformClass *bt_class = GST_BASE_TRANSFORM_CLASS (klass);

  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);

  bt_class->transform_caps = gst_gl_color_convert_element_transform_caps;

  bt_class->set_caps = gst_gl_color_convert_element_set_caps;

  bt_class->get_unit_size = gst_gl_color_convert_element_get_unit_size;

  bt_class->filter_meta = gst_gl_color_convert_element_filter_meta;

  bt_class->decide_allocation = gst_gl_color_convert_element_decide_allocation;

  bt_class->prepare_output_buffer =

      gst_gl_color_convert_element_prepare_output_buffer;

  bt_class->transform = gst_gl_color_convert_element_transform;

  bt_class->stop = gst_gl_color_convert_element_stop;

  bt_class->fixate_caps = gst_gl_color_convert_element_fixate_caps;

  bt_class->passthrough_on_same_caps = TRUE;

  gst_element_class_add_static_pad_template (element_class,

      &gst_gl_color_convert_element_src_pad_template);

  gst_element_class_add_static_pad_template (element_class,

      &gst_gl_color_convert_element_sink_pad_template);

  gst_element_class_set_metadata (element_class,

      "OpenGL color converter", "Filter/Converter/Video",

      "Converts between color spaces using OpenGL shaders",

      "Matthew Waters <matthew@centricular.com>");

}

static void

gst_gl_color_convert_element_init (GstGLColorConvertElement * convert)

{

  gst_base_transform_set_prefer_passthrough (GST_BASE_TRANSFORM (convert),

      TRUE);

}

static gboolean

gst_gl_color_convert_element_set_caps (GstBaseTransform * bt,

    GstCaps * in_caps, GstCaps * out_caps)

{

  GstGLColorConvertElement *convert = GST_GL_COLOR_CONVERT_ELEMENT (bt);

  gst_caps_replace (&convert->in_caps, in_caps);

  gst_caps_replace (&convert->out_caps, out_caps);

  if (convert->convert)

    gst_gl_color_convert_set_caps (convert->convert, in_caps, out_caps);

  return TRUE;

}

static GstCaps *

gst_gl_color_convert_element_transform_caps (GstBaseTransform * bt,

    GstPadDirection direction, GstCaps * caps, GstCaps * filter)

{

  GstGLContext *context = GST_GL_BASE_FILTER (bt)->context;

  return gst_gl_color_convert_transform_caps (context, direction, caps, filter);

}

static gboolean

gst_gl_color_convert_element_get_unit_size (GstBaseTransform * trans,

    GstCaps * caps, gsize * size)

{

  gboolean ret = FALSE;

  GstVideoInfo info;

  ret = gst_video_info_from_caps (&info, caps);

  if (ret)

    *size = GST_VIDEO_INFO_SIZE (&info;;

  return TRUE;

}

static gboolean

gst_gl_color_convert_element_filter_meta (GstBaseTransform * trans,

    GstQuery * query, GType api, const GstStructure * params)

{

  /* propose all metadata upstream */

  return TRUE;

}

static gboolean

gst_gl_color_convert_element_decide_allocation (GstBaseTransform * trans,

    GstQuery * query)

{

  GstGLColorConvertElement *convert = GST_GL_COLOR_CONVERT_ELEMENT (trans);

  GstGLContext *context;

  /* get gl context */

  if (!GST_BASE_TRANSFORM_CLASS

      (gst_gl_color_convert_element_parent_class)->decide_allocation (trans,

          query))

    return FALSE;

  context = GST_GL_BASE_FILTER (trans)->context;

  if (!convert->convert)

    convert->convert = gst_gl_color_convert_new (context);

  if (!gst_gl_color_convert_set_caps (convert->convert, convert->in_caps,

          convert->out_caps))

    return FALSE;

  if (!gst_gl_color_convert_decide_allocation (convert->convert, query))

    return FALSE;

  return TRUE;

}

static GstFlowReturn

gst_gl_color_convert_element_prepare_output_buffer (GstBaseTransform * bt,

    GstBuffer * inbuf, GstBuffer ** outbuf)

{

  GstGLColorConvertElement *convert = GST_GL_COLOR_CONVERT_ELEMENT (bt);

  GstBaseTransformClass *bclass;

  bclass = GST_BASE_TRANSFORM_GET_CLASS (bt);

  if (gst_base_transform_is_passthrough (bt)) {

    *outbuf = inbuf;

    return GST_FLOW_OK;

  }

  if (!convert->convert)

    return GST_FLOW_NOT_NEGOTIATED;

  *outbuf = gst_gl_color_convert_perform (convert->convert, inbuf);

  if (!*outbuf) {

    GST_ELEMENT_ERROR (bt, RESOURCE, NOT_FOUND,

        ("%s", "Failed to convert video buffer"), (NULL));

    return GST_FLOW_ERROR;

  }

  /* basetransform doesn't unref if they're the same */

  if (inbuf == *outbuf)

    gst_buffer_unref (*outbuf);

  else

    bclass->copy_metadata (bt, inbuf, *outbuf);

  return GST_FLOW_OK;

}

static GstFlowReturn

gst_gl_color_convert_element_transform (GstBaseTransform * bt,

    GstBuffer * inbuf, GstBuffer * outbuf)

{

  return GST_FLOW_OK;

}

static GstCaps *

gst_gl_color_convert_element_fixate_caps (GstBaseTransform *

    bt, GstPadDirection direction, GstCaps * caps, GstCaps * othercaps)

{

  GstGLContext *context = GST_GL_BASE_FILTER (bt)->context;

  return gst_gl_color_convert_fixate_caps (context, direction, caps, othercaps);

}