gstreamer/gst-libs/gst/video/gstvideofilter.c

/* GStreamer
 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
 * Copyright (C) <2003> David Schleef <ds@schleef.org>
 *
 * 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 <string.h>
/*#define DEBUG_ENABLED */
#include "gstvideofilter.h"

GST_DEBUG_CATEGORY_STATIC (gst_videofilter_debug);
#define GST_CAT_DEFAULT gst_videofilter_debug

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

enum
{
  ARG_0,
  ARG_METHOD
      /* FILL ME */
};

static void gst_videofilter_base_init (gpointer g_class);
static void gst_videofilter_class_init (gpointer g_class, gpointer class_data);
static void gst_videofilter_init (GTypeInstance * instance, gpointer g_class);

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

static GstFlowReturn gst_videofilter_chain (GstPad * pad, GstBuffer * buffer);
GstCaps *gst_videofilter_class_get_capslist (GstVideofilterClass * klass);

static GstElementClass *parent_class = NULL;

GType
gst_videofilter_get_type (void)
{
  static GType videofilter_type = 0;

  if (!videofilter_type) {
    static const GTypeInfo videofilter_info = {
      sizeof (GstVideofilterClass),
      gst_videofilter_base_init,
      NULL,
      gst_videofilter_class_init,
      NULL,
      NULL,
      sizeof (GstVideofilter),
      0,
      gst_videofilter_init,
    };

    videofilter_type = g_type_register_static (GST_TYPE_ELEMENT,
        "GstVideofilter", &videofilter_info, G_TYPE_FLAG_ABSTRACT);
  }
  return videofilter_type;
}

static void
gst_videofilter_base_init (gpointer g_class)
{
  static GstElementDetails videofilter_details = {
    "Video scaler",
    "Filter/Effect/Video",
    "Resizes video",
    "David Schleef <ds@schleef.org>"
  };
  GstVideofilterClass *klass = (GstVideofilterClass *) g_class;
  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);

  klass->formats = g_ptr_array_new ();

  gst_element_class_set_details (element_class, &videofilter_details);
}

static void
gst_videofilter_class_init (gpointer g_class, gpointer class_data)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;
  GstVideofilterClass *klass;

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

  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);

  gobject_class->set_property = gst_videofilter_set_property;
  gobject_class->get_property = gst_videofilter_get_property;

  GST_DEBUG_CATEGORY_INIT (gst_videofilter_debug, "videofilter", 0,
      "videofilter");
}

static GstStructure *
gst_videofilter_format_get_structure (GstVideofilterFormat * format)
{
  unsigned int fourcc;
  GstStructure *structure;

  if (format->filter_func == NULL)
    return NULL;

  fourcc =
      GST_MAKE_FOURCC (format->fourcc[0], format->fourcc[1], format->fourcc[2],
      format->fourcc[3]);

  if (format->depth) {
    structure = gst_structure_new ("video/x-raw-rgb",
        "depth", G_TYPE_INT, format->depth,
        "bpp", G_TYPE_INT, format->bpp,
        "endianness", G_TYPE_INT, format->endianness,
        "red_mask", G_TYPE_INT, format->red_mask,
        "green_mask", G_TYPE_INT, format->green_mask,
        "blue_mask", G_TYPE_INT, format->blue_mask, NULL);
  } else {
    structure = gst_structure_new ("video/x-raw-yuv",
        "format", GST_TYPE_FOURCC, fourcc, NULL);
  }

  gst_structure_set (structure,
      "height", GST_TYPE_INT_RANGE, 1, G_MAXINT,
      "width", GST_TYPE_INT_RANGE, 1, G_MAXINT,
      "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT, 1, NULL);

  return structure;
}

GstCaps *
gst_videofilter_class_get_capslist (GstVideofilterClass * klass)
{
  GstCaps *caps;
  GstStructure *structure;
  int i;

  caps = gst_caps_new_empty ();
  for (i = 0; i < klass->formats->len; i++) {
    structure =
        gst_videofilter_format_get_structure (g_ptr_array_index (klass->formats,
            i));
    gst_caps_append_structure (caps, structure);
  }

  return caps;
}

static GstCaps *
gst_videofilter_getcaps (GstPad * pad)
{
  GstVideofilter *videofilter;
  GstVideofilterClass *klass;
  GstCaps *caps;
  GstPad *peer;
  int i;

  videofilter = GST_VIDEOFILTER (GST_PAD_PARENT (pad));
  GST_DEBUG_OBJECT (videofilter, "gst_videofilter_getcaps");

  klass = GST_VIDEOFILTER_CLASS (G_OBJECT_GET_CLASS (videofilter));

  /* we can handle anything that was registered */
  caps = gst_caps_new_empty ();
  for (i = 0; i < klass->formats->len; i++) {
    GstCaps *fromcaps;

    fromcaps =
        gst_caps_new_full (gst_videofilter_format_get_structure
        (g_ptr_array_index (klass->formats, i)), NULL);

    gst_caps_append (caps, fromcaps);
  }

  peer = gst_pad_get_peer (pad);
  if (peer) {
    GstCaps *peercaps;

    peercaps = gst_pad_get_caps (peer);
    if (peercaps) {
      GstCaps *icaps;

      icaps = gst_caps_intersect (peercaps, caps);
      gst_caps_unref (peercaps);
      gst_caps_unref (caps);
      caps = icaps;
    }
    //gst_object_unref (peer);
  }

  return caps;
}

static gboolean
gst_videofilter_setcaps (GstPad * pad, GstCaps * caps)
{
  GstVideofilter *videofilter;
  GstStructure *structure;
  int width, height;
  const GValue *framerate;
  int ret;

  videofilter = GST_VIDEOFILTER (GST_PAD_PARENT (pad));

  structure = gst_caps_get_structure (caps, 0);

  videofilter->format =
      gst_videofilter_find_format_by_structure (videofilter, structure);
  g_return_val_if_fail (videofilter->format, GST_PAD_LINK_REFUSED);

  ret = gst_structure_get_int (structure, "width", &width);
  ret &= gst_structure_get_int (structure, "height", &height);

  framerate = gst_structure_get_value (structure, "framerate");
  ret &= (framerate != NULL && GST_VALUE_HOLDS_FRACTION (framerate));

  if (!ret)
    return FALSE;

  gst_pad_set_caps (videofilter->srcpad, caps);

  GST_DEBUG_OBJECT (videofilter, "width %d height %d", width, height);

#if 0
  if (pad == videofilter->srcpad) {
    videofilter->to_width = width;
    videofilter->to_height = height;
  } else {
    videofilter->from_width = width;
    videofilter->from_height = height;
  }
#endif
  videofilter->to_width = width;
  videofilter->to_height = height;
  videofilter->from_width = width;
  videofilter->from_height = height;
  g_value_copy (framerate, &videofilter->framerate);

  gst_videofilter_setup (videofilter);

  return TRUE;
}

static void
gst_videofilter_init (GTypeInstance * instance, gpointer g_class)
{
  GstVideofilter *videofilter = GST_VIDEOFILTER (instance);
  GstPadTemplate *pad_template;

  GST_DEBUG_OBJECT (videofilter, "gst_videofilter_init");

  pad_template =
      gst_element_class_get_pad_template (GST_ELEMENT_CLASS (g_class), "sink");
  g_return_if_fail (pad_template != NULL);
  videofilter->sinkpad = gst_pad_new_from_template (pad_template, "sink");
  gst_element_add_pad (GST_ELEMENT (videofilter), videofilter->sinkpad);
  gst_pad_set_chain_function (videofilter->sinkpad, gst_videofilter_chain);
  gst_pad_set_setcaps_function (videofilter->sinkpad, gst_videofilter_setcaps);
  gst_pad_set_getcaps_function (videofilter->sinkpad, gst_videofilter_getcaps);

  pad_template =
      gst_element_class_get_pad_template (GST_ELEMENT_CLASS (g_class), "src");
  g_return_if_fail (pad_template != NULL);
  videofilter->srcpad = gst_pad_new_from_template (pad_template, "src");
  gst_element_add_pad (GST_ELEMENT (videofilter), videofilter->srcpad);
  gst_pad_set_getcaps_function (videofilter->srcpad, gst_videofilter_getcaps);

  videofilter->inited = FALSE;
  g_value_init (&videofilter->framerate, GST_TYPE_FRACTION);
}

static GstFlowReturn
gst_videofilter_chain (GstPad * pad, GstBuffer * buf)
{
  GstVideofilter *videofilter;
  guchar *data;
  gulong size;
  GstBuffer *outbuf;
  GstFlowReturn ret;

  videofilter = GST_VIDEOFILTER (GST_PAD_PARENT (pad));
  GST_DEBUG_OBJECT (videofilter, "gst_videofilter_chain");

  if (videofilter->passthru) {
    return gst_pad_push (videofilter->srcpad, buf);
  }

  if (GST_PAD_CAPS (pad) == NULL) {
    return GST_FLOW_NOT_NEGOTIATED;
  }

  data = GST_BUFFER_DATA (buf);
  size = GST_BUFFER_SIZE (buf);

  GST_LOG_OBJECT (videofilter, "got buffer of %ld bytes in '%s'", size,
      GST_OBJECT_NAME (videofilter));

  GST_LOG_OBJECT (videofilter,
      "size=%ld from=%dx%d to=%dx%d fromsize=%ld (should be %d) tosize=%d",
      size, videofilter->from_width, videofilter->from_height,
      videofilter->to_width, videofilter->to_height, size,
      videofilter->from_buf_size, videofilter->to_buf_size);


  if (size > videofilter->from_buf_size) {
    GST_INFO_OBJECT (videofilter, "buffer size %ld larger than expected (%d)",
        size, videofilter->from_buf_size);
    return GST_FLOW_ERROR;
  }

  ret = gst_pad_alloc_buffer (videofilter->srcpad, GST_BUFFER_OFFSET_NONE,
      videofilter->to_buf_size, GST_PAD_CAPS (videofilter->srcpad), &outbuf);
  if (ret != GST_FLOW_OK)
    goto no_buffer;

  g_return_val_if_fail (GST_BUFFER_DATA (outbuf), GST_FLOW_ERROR);

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

  g_return_val_if_fail (videofilter->format, GST_FLOW_ERROR);
  GST_DEBUG_OBJECT (videofilter, "format %s", videofilter->format->fourcc);

  videofilter->in_buf = buf;
  videofilter->out_buf = outbuf;

  videofilter->format->filter_func (videofilter, GST_BUFFER_DATA (outbuf),
      data);
  gst_buffer_unref (buf);

  GST_LOG_OBJECT (videofilter, "pushing buffer of %d bytes in '%s'",
      GST_BUFFER_SIZE (outbuf), GST_OBJECT_NAME (videofilter));

  ret = gst_pad_push (videofilter->srcpad, outbuf);

  return ret;

no_buffer:
  {
    return ret;
  }
}

static void
gst_videofilter_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec)
{
  GstVideofilter *videofilter;

  g_return_if_fail (GST_IS_VIDEOFILTER (object));
  videofilter = GST_VIDEOFILTER (object);

  GST_DEBUG_OBJECT (videofilter, "gst_videofilter_set_property");
  switch (prop_id) {
    default:
      break;
  }
}

static void
gst_videofilter_get_property (GObject * object, guint prop_id, GValue * value,
    GParamSpec * pspec)
{
  GstVideofilter *videofilter;

  g_return_if_fail (GST_IS_VIDEOFILTER (object));
  videofilter = GST_VIDEOFILTER (object);

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

int
gst_videofilter_get_input_width (GstVideofilter * videofilter)
{
  g_return_val_if_fail (GST_IS_VIDEOFILTER (videofilter), 0);

  return videofilter->from_width;
}

int
gst_videofilter_get_input_height (GstVideofilter * videofilter)
{
  g_return_val_if_fail (GST_IS_VIDEOFILTER (videofilter), 0);

  return videofilter->from_height;
}

void
gst_videofilter_set_output_size (GstVideofilter * videofilter,
    int width, int height)
{
  GstCaps *srccaps;
  GstStructure *structure;

  g_return_if_fail (GST_IS_VIDEOFILTER (videofilter));

  videofilter->to_width = width;
  videofilter->to_height = height;

  videofilter->to_buf_size = (videofilter->to_width * videofilter->to_height
      * videofilter->format->bpp) / 8;

  //srccaps = gst_caps_copy (gst_pad_get_negotiated_caps (videofilter->srcpad));
  srccaps = gst_caps_copy (GST_PAD_CAPS (videofilter->srcpad));
  structure = gst_caps_get_structure (srccaps, 0);

  gst_structure_set (structure, "width", G_TYPE_INT, width,
      "height", G_TYPE_INT, height, NULL);

  gst_pad_set_caps (videofilter->srcpad, srccaps);
}

void
gst_videofilter_setup (GstVideofilter * videofilter)
{
  GstVideofilterClass *klass;

  GST_DEBUG_OBJECT (videofilter, "setup");

  klass = GST_VIDEOFILTER_CLASS (G_OBJECT_GET_CLASS (videofilter));

  if (klass->setup) {
    GST_DEBUG_OBJECT (videofilter, "calling class setup method");
    klass->setup (videofilter);
  }

  if (videofilter->to_width == 0) {
    videofilter->to_width = videofilter->from_width;
  }
  if (videofilter->to_height == 0) {
    videofilter->to_height = videofilter->from_height;
  }

  g_return_if_fail (videofilter->format != NULL);
  g_return_if_fail (videofilter->from_width > 0);
  g_return_if_fail (videofilter->from_height > 0);
  g_return_if_fail (videofilter->to_width > 0);
  g_return_if_fail (videofilter->to_height > 0);

  videofilter->from_buf_size =
      (videofilter->from_width * videofilter->from_height *
      videofilter->format->bpp) / 8;
  videofilter->to_buf_size =
      (videofilter->to_width * videofilter->to_height *
      videofilter->format->bpp) / 8;

  GST_DEBUG_OBJECT (videofilter, "from_buf_size %d to_buf_size %d",
      videofilter->from_buf_size, videofilter->to_buf_size);
  videofilter->inited = TRUE;
}

GstVideofilterFormat *
gst_videofilter_find_format_by_structure (GstVideofilter * videofilter,
    const GstStructure * structure)
{
  int i;
  GstVideofilterClass *klass;
  GstVideofilterFormat *format;
  gboolean ret;

  klass = GST_VIDEOFILTER_CLASS (G_OBJECT_GET_CLASS (videofilter));

  g_return_val_if_fail (structure != NULL, NULL);

  if (strcmp (gst_structure_get_name (structure), "video/x-raw-yuv") == 0) {
    guint32 fourcc;

    ret = gst_structure_get_fourcc (structure, "format", &fourcc);
    if (!ret)
      return NULL;
    for (i = 0; i < klass->formats->len; i++) {
      guint32 format_fourcc;

      format = g_ptr_array_index (klass->formats, i);
      format_fourcc = GST_STR_FOURCC (format->fourcc);
      if (format->depth == 0 && format_fourcc == fourcc) {
        return format;
      }
    }
  } else if (strcmp (gst_structure_get_name (structure), "video/x-raw-rgb")
      == 0) {
    int bpp;
    int depth;
    int endianness;
    int red_mask;
    int green_mask;
    int blue_mask;

    ret = gst_structure_get_int (structure, "bpp", &bpp);
    ret &= gst_structure_get_int (structure, "depth", &depth);
    ret &= gst_structure_get_int (structure, "endianness", &endianness);
    ret &= gst_structure_get_int (structure, "red_mask", &red_mask);
    ret &= gst_structure_get_int (structure, "green_mask", &green_mask);
    ret &= gst_structure_get_int (structure, "blue_mask", &blue_mask);
    if (!ret)
      return NULL;
    for (i = 0; i < klass->formats->len; i++) {
      format = g_ptr_array_index (klass->formats, i);
      if (format->bpp == bpp && format->depth == depth &&
          format->endianness == endianness && format->red_mask == red_mask &&
          format->green_mask == green_mask && format->blue_mask == blue_mask) {
        return format;
      }
    }
  }

  return NULL;
}

void
gst_videofilter_class_add_format (GstVideofilterClass * videofilterclass,
    GstVideofilterFormat * format)
{
  g_ptr_array_add (videofilterclass->formats, format);
}

void
gst_videofilter_class_add_pad_templates (GstVideofilterClass *
    videofilter_class)
{
  GstElementClass *element_class = GST_ELEMENT_CLASS (videofilter_class);

  gst_element_class_add_pad_template (element_class,
      gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
          gst_videofilter_class_get_capslist (videofilter_class)));

  gst_element_class_add_pad_template (element_class,
      gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
          gst_videofilter_class_get_capslist (videofilter_class)));
}