gstreamer/gst/level/gstlevel.c

/* 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.
 */

#include <gst/gst.h>
#include "gstlevel.h"
#include "math.h"

/* elementfactory information */
static GstElementDetails level_details = {
  "Level",
  "Filter/Audio/Analysis",
  "LGPL",
  "RMS Level indicator for audio/raw",
  VERSION,
  "Thomas <thomas@apestaart.org>",
  "(C) 2001",
};


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

enum {
  ARG_0
};

static GstPadTemplate*
level_src_factory (void)
{
  static GstPadTemplate *template = NULL;

  if (!template) {
    template = gst_pad_template_new (
      "src",
      GST_PAD_SRC,
      GST_PAD_ALWAYS,
      gst_caps_new (
        "test_src",
        "audio/raw",
	gst_props_new (
          "channels", GST_PROPS_INT_RANGE (1, 2),
	  NULL)),
      NULL);
  }
  return template;
}

static GstPadTemplate*
level_sink_factory (void)
{
  static GstPadTemplate *template = NULL;

  if (!template) {
    template = gst_pad_template_new (
      "sink",
      GST_PAD_SINK,
      GST_PAD_ALWAYS,
      gst_caps_new (
        "test_src",
        "audio/raw",
	gst_props_new (
          "channels", GST_PROPS_INT_RANGE (1, 2),
	  NULL)),
      NULL);
  }
  return template;
}

static void		gst_level_class_init		(GstLevelClass *klass);
static void		gst_level_init			(GstLevel *filter);

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

static void		gst_level_chain			(GstPad *pad, GstBuffer *buf);
static void inline 	gst_level_fast_16bit_chain 	(gint16* data, gint16** out_data, 
			         				 guint numsamples);
static void inline 	gst_level_fast_8bit_chain		(gint8* data, gint8** out_data,
                                				 guint numsamples);

static GstElementClass *parent_class = NULL;
/*static guint gst_filter_signals[LAST_SIGNAL] = { 0 }; */

GType
gst_level_get_type (void) 
{
  static GType level_type = 0;

  if (!level_type) 
  {
    static const GTypeInfo level_info = 
    {
      sizeof (GstLevelClass), NULL, NULL,
      (GClassInitFunc) gst_level_class_init, NULL, NULL,
      sizeof (GstLevel), 0,
      (GInstanceInitFunc) gst_level_init
    };
    level_type = g_type_register_static (GST_TYPE_ELEMENT, "GstLevel", 
	                                 &level_info, 0);
  }
  return level_type;
}

static GstPadLinkReturn
gst_level_connect (GstPad *pad, GstCaps *caps)
{
  GstLevel *filter;
  GstPad *otherpad;

  filter = GST_LEVEL (gst_pad_get_parent (pad));
  g_return_val_if_fail (filter != NULL, GST_PAD_LINK_REFUSED);
  g_return_val_if_fail (GST_IS_LEVEL (filter), GST_PAD_LINK_REFUSED);
  otherpad = (pad == filter->srcpad ? filter->sinkpad : filter->srcpad);
	  
  if (GST_CAPS_IS_FIXED (caps)) 
  {
    /*if ( !volume_parse_caps (filter, caps) || */
    return gst_pad_try_set_caps (otherpad, caps);
  }
  return GST_PAD_LINK_DELAYED;
}

static void
gst_level_chain (GstPad *pad, GstBuffer *buf)
{
  GstLevel *filter;
  gint16 *in_data;
  gint16 *out_data;
  GstBuffer* outbuf;
  gint width;

  GstCaps *caps;

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

  filter = GST_LEVEL (GST_OBJECT_PARENT (pad));
  g_return_if_fail (filter != NULL);
  g_return_if_fail (GST_IS_LEVEL (filter));

  caps = NULL;
  caps = GST_PAD_CAPS (pad);
  if (caps == NULL)
  {
    /* FIXME : Please change this to a better warning method ! */
    g_error ("WARNING: level: Could not get pad caps - caps nego failed !\n");
  }

  gst_caps_get_int (caps, "width", &width);

  in_data = (gint16 *) GST_BUFFER_DATA(buf);
  outbuf = gst_buffer_new();
  GST_BUFFER_DATA (outbuf) = (gchar *) g_new (gint16, 
                                              GST_BUFFER_SIZE (buf) / 2);
  GST_BUFFER_SIZE (outbuf) = GST_BUFFER_SIZE (buf);

  out_data = (gint16 *) GST_BUFFER_DATA (outbuf);
  
  g_print ("%s: ", gst_element_get_name (GST_ELEMENT (filter)));
  switch (width) {
    case 16:
	gst_level_fast_16bit_chain (in_data, &out_data,
	                            GST_BUFFER_SIZE (buf) / 2);
	break;
    case 8:
	gst_level_fast_8bit_chain ((gint8 *) in_data,
	                           (gint8 **) &out_data, GST_BUFFER_SIZE(buf));
	break;
  }
  gst_buffer_unref (buf);
  gst_pad_push (filter->srcpad,outbuf);
}

static void inline
gst_level_fast_16bit_chain (gint16* in_data, gint16** out_data, 
			    guint num_samples)
#include "filter.func"

static void inline
gst_level_fast_8bit_chain (gint8* in_data, gint8** out_data,
                           guint num_samples)
#include "filter.func"

static void
gst_level_set_property (GObject *object, guint prop_id, 
                        const GValue *value, GParamSpec *pspec)
{
  GstLevel *filter;

  /* it's not null if we got it, but it might not be ours */
  g_return_if_fail (GST_IS_LEVEL (object));
  filter = GST_LEVEL (object);

  switch (prop_id) {
    default:
      break;
  }
}

static void
gst_level_get_property (GObject *object, guint prop_id, 
                        GValue *value, GParamSpec *pspec)
{
  GstLevel *filter;

  /* it's not null if we got it, but it might not be ours */
  g_return_if_fail (GST_IS_LEVEL (object));
  filter = GST_LEVEL (object);

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

static void
gst_level_class_init (GstLevelClass *klass)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;

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

  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);

  gobject_class->set_property = gst_level_set_property;
  gobject_class->get_property = gst_level_get_property;
}

static void
gst_level_init (GstLevel *filter)
{
  filter->sinkpad = gst_pad_new_from_template (level_sink_factory (), "sink");
  gst_pad_set_link_function (filter->sinkpad, gst_level_connect);
  filter->srcpad = gst_pad_new_from_template (level_src_factory (), "src");
  gst_pad_set_link_function (filter->srcpad, gst_level_connect);

  gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
  gst_pad_set_chain_function (filter->sinkpad, gst_level_chain);
  filter->srcpad = gst_pad_new ("src", GST_PAD_SRC);
  gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
}

static gboolean
plugin_init (GModule *module, GstPlugin *plugin)
{
  GstElementFactory *factory;

  factory = gst_element_factory_new ("level", GST_TYPE_LEVEL,
                                     &level_details);
  g_return_val_if_fail (factory != NULL, FALSE);
  
  gst_element_factory_add_pad_template (factory, level_src_factory ());
  gst_element_factory_add_pad_template (factory, level_sink_factory ());

  gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));

  return TRUE;
}

GstPluginDesc plugin_desc = {
  GST_VERSION_MAJOR,
  GST_VERSION_MINOR,
  "level",
  plugin_init
};