gstreamer/gst/smoothwave/gstsmoothwave.c

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/* 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 =
GST_ELEMENT_DETAILS ("Smooth waveform",
"Visualization",
"Fading grayscale waveform display",
"Erik Walthinsen <omega@cse.ogi.edu>");
/* SmoothWave signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0,
ARG_WIDTH,
ARG_HEIGHT,
ARG_WIDGET,
};
static void gst_smoothwave_base_init (gpointer g_class);
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, GstData * _data);
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),
gst_smoothwave_base_init,
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_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details (element_class, &gst_smoothwave_details);
}
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, GstData * _data)
{
GstBuffer *buf = GST_BUFFER (_data);
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 (GstPlugin * plugin)
{
if (!gst_element_register (plugin, "smoothwave", GST_RANK_NONE,
GST_TYPE_SMOOTHWAVE))
return FALSE;
return TRUE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"smoothwave",
"Fading greyscale waveform display",
plugin_init, VERSION, "LGPL", GST_PACKAGE, GST_ORIGIN)