gstreamer/gst/smoothwave/gstsmoothwave.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.
 */


#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>

#include "gstsmoothwave.h"

static GstElementDetails gst_smoothwave_details = {
  "Smooth waveform",
  "Sink/Visualization",
  "LGPL",
  "Fading grayscale waveform display",
  VERSION,
  "Erik Walthinsen <omega@cse.ogi.edu>",
  "(C) 1999",
};


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

enum {
  ARG_0,
  ARG_WIDTH,
  ARG_HEIGHT,
  ARG_WIDGET,
};


static void	gst_smoothwave_class_init	(GstSmoothWaveClass *klass);
static void	gst_smoothwave_init		(GstSmoothWave *smoothwave);

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

static void	gst_smoothwave_chain		(GstPad *pad, GstBuffer *buf);

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


GType
gst_smoothwave_get_type (void)
{
  static GType smoothwave_type = 0;

  if (!smoothwave_type) {
    static const GTypeInfo smoothwave_info = {
      sizeof(GstSmoothWaveClass),      NULL,
      NULL,
      (GClassInitFunc)gst_smoothwave_class_init,
      NULL,
      NULL,
      sizeof(GstSmoothWave),
      0,
      (GInstanceInitFunc)gst_smoothwave_init,
    };
    smoothwave_type = g_type_register_static(GST_TYPE_ELEMENT, "GstSmoothWave", &smoothwave_info, 0);
  }
  return smoothwave_type;
}

static void
gst_smoothwave_class_init (GstSmoothWaveClass *klass)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;

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

  parent_class = g_type_class_ref(GST_TYPE_ELEMENT);

  g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_WIDTH,
    g_param_spec_int("width","width","width",
                     G_MININT,G_MAXINT,0,G_PARAM_READWRITE)); /* CHECKME */
  g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_HEIGHT,
    g_param_spec_int("height","height","height",
                     G_MININT,G_MAXINT,0,G_PARAM_READWRITE)); /* CHECKME */
  g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_WIDGET,
    g_param_spec_object("widget","widget","widget",
                        GTK_TYPE_WIDGET,G_PARAM_READABLE)); /* CHECKME! */

  gobject_class->set_property = gst_smoothwave_set_property;
  gobject_class->get_property = gst_smoothwave_get_property;
}

static void
gst_smoothwave_init (GstSmoothWave *smoothwave)
{
  int i;
  guint32 palette[256];

  smoothwave->sinkpad = gst_pad_new("sink",GST_PAD_SINK);
  gst_element_add_pad(GST_ELEMENT(smoothwave),smoothwave->sinkpad);
  gst_pad_set_chain_function(smoothwave->sinkpad,gst_smoothwave_chain);
  smoothwave->srcpad = gst_pad_new("src",GST_PAD_SRC);
  gst_element_add_pad(GST_ELEMENT(smoothwave),smoothwave->srcpad);

/*  smoothwave->meta = NULL; */
  smoothwave->width = 512;
  smoothwave->height = 256;

  gdk_rgb_init();
/*  gtk_widget_set_default_colormap (gdk_rgb_get_cmap()); */
/*  gtk_widget_set_default_visual (gdk_rgb_get_visual()); */

/*  GST_DEBUG ("creating palette"); */
  for (i=0;i<256;i++)
    palette[i] = (i << 16) || (i << 8);
/*  GST_DEBUG ("creating cmap"); */
  smoothwave->cmap = gdk_rgb_cmap_new(palette,256);
/*  GST_DEBUG ("created cmap"); */
/*  gtk_widget_set_default_colormap (smoothwave->cmap); */

  smoothwave->image = gtk_drawing_area_new();
  gtk_drawing_area_size(GTK_DRAWING_AREA(smoothwave->image),
                        smoothwave->width,smoothwave->height);
  gtk_widget_show(smoothwave->image);

  smoothwave->imagebuffer = g_malloc(smoothwave->width*smoothwave->height);
  memset(smoothwave->imagebuffer,0,smoothwave->width*smoothwave->height);
}

static void
gst_smoothwave_chain (GstPad *pad, GstBuffer *buf)
{
  GstSmoothWave *smoothwave;
  gint16 *samples;
  gint samplecount,i;
  register guint32 *ptr;
  gint qheight;

  g_return_if_fail(pad != NULL);
  g_return_if_fail(GST_IS_PAD(pad));
  g_return_if_fail(buf != NULL);
/*  g_return_if_fail(GST_IS_BUFFER(buf)); */

  smoothwave = GST_SMOOTHWAVE(GST_OBJECT_PARENT (pad));

  /* first deal with audio metadata */
#if 0
  if (buf->meta) {
    if (smoothwave->meta != NULL) {
      /* FIXME: need to unref the old metadata so it goes away */
    }
    /* we just make a copy of the pointer */
    smoothwave->meta = (MetaAudioRaw *)(buf->meta);
    /* FIXME: now we have to ref the metadata so it doesn't go away */
  }
#endif

/*  g_return_if_fail(smoothwave->meta != NULL); */

  samples = (gint16 *)GST_BUFFER_DATA(buf);
/*  samplecount = buf->datasize / (smoothwave->meta->channels * sizeof(gint16)); */
  samplecount = GST_BUFFER_SIZE(buf) / (2 * sizeof(gint16));

  qheight = smoothwave->height/4;

/*  GST_DEBUG ("traversing %d",smoothwave->width); */
  for (i=0;i<MAX(smoothwave->width,samplecount);i++) {
    gint16 y1 = (gint32)(samples[i*2] * qheight) / 32768 +
                qheight;
    gint16 y2 = (gint32)(samples[(i*2)+1] * qheight) / 32768 +
                (qheight*3);
    smoothwave->imagebuffer[y1*smoothwave->width + i] = 0xff;
    smoothwave->imagebuffer[y2*smoothwave->width + i] = 0xff;
/*    smoothwave->imagebuffer[i+(smoothwave->width*5)] = i; */
  }

  ptr = (guint32 *)smoothwave->imagebuffer;
  for (i=0;i<(smoothwave->width*smoothwave->height)/4;i++) {
    if (*ptr){
      *ptr -= ((*ptr & 0xf0f0f0f0ul) >> 4) + ((*ptr & 0xe0e0e0e0ul) >> 5);
      ptr++;
    }else{
      ptr++;
    }
  }

/*  GST_DEBUG ("drawing"); */
/*  GST_DEBUG ("gdk_draw_indexed_image(%p,%p,%d,%d,%d,%d,%s,%p,%d,%p);",
        smoothwave->image->window,
	smoothwave->image->style->fg_gc[GTK_STATE_NORMAL],
	0,0,smoothwave->width,smoothwave->height,
	"GDK_RGB_DITHER_NORMAL",
	smoothwave->imagebuffer,smoothwave->width,
	smoothwave->cmap);*/
/*  gdk_draw_indexed_image(smoothwave->image->window,
	smoothwave->image->style->fg_gc[GTK_STATE_NORMAL],
	0,0,smoothwave->width,smoothwave->height,
	GDK_RGB_DITHER_NONE,
	smoothwave->imagebuffer,smoothwave->width,
	smoothwave->cmap);*/
  gdk_draw_gray_image(smoothwave->image->window,
	smoothwave->image->style->fg_gc[GTK_STATE_NORMAL],
	0,0,smoothwave->width,smoothwave->height,
	GDK_RGB_DITHER_NORMAL,
	smoothwave->imagebuffer,smoothwave->width);

/*  gst_trace_add_entry(NULL,0,buf,"smoothwave: calculated smoothwave"); */

  gst_buffer_unref(buf);
}

static void
gst_smoothwave_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
  GstSmoothWave *smoothwave;

  /* it's not null if we got it, but it might not be ours */
  g_return_if_fail(GST_IS_SMOOTHWAVE(object));
  smoothwave = GST_SMOOTHWAVE(object);

  switch (prop_id) {
    case ARG_WIDTH:
      smoothwave->width = g_value_get_int (value);
      gtk_drawing_area_size(GTK_DRAWING_AREA(smoothwave->image),
                            smoothwave->width,smoothwave->height);
      gtk_widget_set_usize(GTK_WIDGET(smoothwave->image),
                           smoothwave->width,smoothwave->height);
      break;
    case ARG_HEIGHT:
      smoothwave->height = g_value_get_int (value);
      gtk_drawing_area_size(GTK_DRAWING_AREA(smoothwave->image),
                            smoothwave->width,smoothwave->height);
      gtk_widget_set_usize(GTK_WIDGET(smoothwave->image),
                           smoothwave->width,smoothwave->height);
      break;
    default:
      break;
  }
}

static void
gst_smoothwave_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
  GstSmoothWave *smoothwave;

  /* it's not null if we got it, but it might not be ours */
  smoothwave = GST_SMOOTHWAVE(object);

  switch (prop_id) {
    case ARG_WIDTH: {
      g_value_set_int (value, smoothwave->width);
      break;
    }
    case ARG_HEIGHT: {
      g_value_set_int (value, smoothwave->height);
      break;
    }
    case ARG_WIDGET: {
      g_value_set_object (value, smoothwave->image);
      break;
    }
    default: {
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
  }
}



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

  /* create an elementfactory for the smoothwave element */
  factory = gst_element_factory_new("smoothwave",GST_TYPE_SMOOTHWAVE,
                                   &gst_smoothwave_details);
  g_return_val_if_fail(factory != NULL, FALSE);

  gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));

  return TRUE;
}

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