gstreamer/gst/monoscope/gstmonoscope.c

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/* gstmonoscope.c: implementation of monoscope drawing element
* Copyright (C) <2002> Richard Boulton <richard@tartarus.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.
*/
#include <config.h>
#include <gst/gst.h>
#include "monoscope.h"
#define GST_TYPE_MONOSCOPE (gst_monoscope_get_type())
#define GST_MONOSCOPE(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_MONOSCOPE,GstMonoscope))
#define GST_MONOSCOPE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_MONOSCOPE,GstMonoscope))
#define GST_IS_MONOSCOPE(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_MONOSCOPE))
#define GST_IS_MONOSCOPE_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_MONOSCOPE))
typedef struct _GstMonoscope GstMonoscope;
typedef struct _GstMonoscopeClass GstMonoscopeClass;
struct _GstMonoscope {
GstElement element;
/* pads */
GstPad *sinkpad,*srcpad;
GstBufferPool *peerpool;
/* the timestamp of the next frame */
guint64 next_time;
gint16 datain[512];
/* video state */
gint fps;
gint width;
gint height;
gboolean first_buffer;
/* visualisation state */
struct monoscope_state * visstate;
};
struct _GstMonoscopeClass {
GstElementClass parent_class;
};
GType gst_monoscope_get_type(void);
/* elementfactory information */
static GstElementDetails gst_monoscope_details = {
"Monoscope",
"Visualization",
"Displays a highly stabilised waveform of audio input",
VERSION,
"Richard Boulton <richard@tartarus.org>",
"(C) 2002",
};
/* signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
ARG_WIDTH,
ARG_HEIGHT,
ARG_FPS,
/* FILL ME */
};
GST_PAD_TEMPLATE_FACTORY (src_template,
"src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_CAPS_NEW (
"monoscopesrc",
"video/raw",
"format", GST_PROPS_FOURCC (GST_STR_FOURCC ("RGB ")),
"bpp", GST_PROPS_INT (32),
"depth", GST_PROPS_INT (32),
"endianness", GST_PROPS_INT (G_BYTE_ORDER),
"red_mask", GST_PROPS_INT (0xff0000),
"green_mask", GST_PROPS_INT (0xff00),
"blue_mask", GST_PROPS_INT (0xff),
"width", GST_PROPS_INT_RANGE (16, 4096),
"height", GST_PROPS_INT_RANGE (16, 4096)
)
)
GST_PAD_TEMPLATE_FACTORY (sink_template,
"sink", /* the name of the pads */
GST_PAD_SINK, /* type of the pad */
GST_PAD_ALWAYS, /* ALWAYS/SOMETIMES */
GST_CAPS_NEW (
"monoscopesink", /* the name of the caps */
"audio/raw", /* the mime type of the caps */
/* Properties follow: */
"format", GST_PROPS_STRING ("int"),
"law", GST_PROPS_INT (0),
"endianness", GST_PROPS_INT (G_BYTE_ORDER),
"signed", GST_PROPS_BOOLEAN (TRUE),
"width", GST_PROPS_INT (16),
"depth", GST_PROPS_INT (16),
"rate", GST_PROPS_INT_RANGE (8000, 96000),
"channels", GST_PROPS_INT (1)
)
)
static void gst_monoscope_class_init (GstMonoscopeClass *klass);
static void gst_monoscope_init (GstMonoscope *monoscope);
static void gst_monoscope_set_property (GObject *object, guint prop_id,
const GValue *value, GParamSpec *pspec);
static void gst_monoscope_get_property (GObject *object, guint prop_id,
GValue *value, GParamSpec *pspec);
static void gst_monoscope_chain (GstPad *pad, GstBuffer *buf);
static GstPadConnectReturn
gst_monoscope_sinkconnect (GstPad *pad, GstCaps *caps);
static GstElementClass *parent_class = NULL;
GType
gst_monoscope_get_type (void)
{
static GType type = 0;
if (!type) {
static const GTypeInfo info = {
sizeof (GstMonoscopeClass),
NULL,
NULL,
(GClassInitFunc) gst_monoscope_class_init,
NULL,
NULL,
sizeof (GstMonoscope),
0,
(GInstanceInitFunc) gst_monoscope_init,
};
type = g_type_register_static (GST_TYPE_ELEMENT, "GstMonoscope", &info, 0);
}
return type;
}
static void
gst_monoscope_class_init(GstMonoscopeClass *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","The Width",
1, 2048, 256, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_HEIGHT,
g_param_spec_int ("height","Height","The height",
1, 2048, 128, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_FPS,
g_param_spec_int ("fps","FPS","Frames per second",
1, 100, 25, G_PARAM_READWRITE));
gobject_class->set_property = gst_monoscope_set_property;
gobject_class->get_property = gst_monoscope_get_property;
}
static void
gst_monoscope_init (GstMonoscope *monoscope)
{
/* create the sink and src pads */
monoscope->sinkpad = gst_pad_new_from_template (
GST_PAD_TEMPLATE_GET (sink_template ), "sink");
monoscope->srcpad = gst_pad_new_from_template (
GST_PAD_TEMPLATE_GET (src_template ), "src");
gst_element_add_pad (GST_ELEMENT (monoscope), monoscope->sinkpad);
gst_element_add_pad (GST_ELEMENT (monoscope), monoscope->srcpad);
gst_pad_set_chain_function (monoscope->sinkpad, gst_monoscope_chain);
gst_pad_set_connect_function (monoscope->sinkpad, gst_monoscope_sinkconnect);
monoscope->next_time = 0;
monoscope->peerpool = NULL;
/* reset the initial video state */
monoscope->first_buffer = TRUE;
monoscope->width = 256;
monoscope->height = 128;
monoscope->fps = 25; /* desired frame rate */
}
static GstPadConnectReturn
gst_monoscope_sinkconnect (GstPad *pad, GstCaps *caps)
{
GstMonoscope *monoscope;
monoscope = GST_MONOSCOPE (gst_pad_get_parent (pad));
if (!GST_CAPS_IS_FIXED (caps)) {
return GST_PAD_CONNECT_DELAYED;
}
return GST_PAD_CONNECT_OK;
}
static void
gst_monoscope_chain (GstPad *pad, GstBuffer *bufin)
{
GstMonoscope *monoscope;
GstBuffer *bufout;
guint32 samples_in;
gint16 *data;
gint i;
monoscope = GST_MONOSCOPE (gst_pad_get_parent (pad));
GST_DEBUG (0, "Monoscope: chainfunc called");
samples_in = GST_BUFFER_SIZE (bufin) / sizeof (gint16);
GST_DEBUG (0, "input buffer has %d samples", samples_in);
/* FIXME: should really select the first 1024 samples after the timestamp. */
if (GST_BUFFER_TIMESTAMP (bufin) < monoscope->next_time || samples_in < 1024) {
GST_DEBUG (0, "timestamp is %llu: want >= %llu", GST_BUFFER_TIMESTAMP (bufin), monoscope->next_time);
gst_buffer_unref (bufin);
return;
}
data = (gint16 *) GST_BUFFER_DATA (bufin);
/* FIXME: Select samples in a better way. */
for (i=0; i < 512; i++) {
monoscope->datain[i] = *data++;
}
if (monoscope->first_buffer) {
GstCaps *caps;
monoscope->visstate = monoscope_init (monoscope->width, monoscope->height);
g_assert(monoscope->visstate != 0);
GST_DEBUG (0, "making new pad");
caps = GST_CAPS_NEW (
"monoscopesrc",
"video/raw",
"format", GST_PROPS_FOURCC (GST_STR_FOURCC ("RGB ")),
"bpp", GST_PROPS_INT (32),
"depth", GST_PROPS_INT (32),
"endianness", GST_PROPS_INT (G_BYTE_ORDER),
"red_mask", GST_PROPS_INT (0xff0000),
"green_mask", GST_PROPS_INT (0x00ff00),
"blue_mask", GST_PROPS_INT (0x0000ff),
"width", GST_PROPS_INT (monoscope->width),
"height", GST_PROPS_INT (monoscope->height)
);
if (gst_pad_try_set_caps (monoscope->srcpad, caps) <= 0) {
gst_element_error (GST_ELEMENT (monoscope), "could not set caps");
return;
}
monoscope->first_buffer = FALSE;
}
bufout = gst_buffer_new ();
GST_BUFFER_SIZE (bufout) = monoscope->width * monoscope->height * 4;
GST_BUFFER_DATA (bufout) = (guchar *) monoscope_update (monoscope->visstate, monoscope->datain);
GST_BUFFER_TIMESTAMP (bufout) = monoscope->next_time;
GST_BUFFER_FLAG_SET (bufout, GST_BUFFER_DONTFREE);
monoscope->next_time += GST_SECOND / monoscope->fps;
gst_pad_push (monoscope->srcpad, bufout);
gst_buffer_unref (bufin);
GST_DEBUG (0, "Monoscope: exiting chainfunc");
}
static void
gst_monoscope_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
GstMonoscope *monoscope;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_MONOSCOPE (object));
monoscope = GST_MONOSCOPE (object);
switch (prop_id) {
case ARG_WIDTH:
monoscope->width = g_value_get_int (value);
break;
case ARG_HEIGHT:
monoscope->height = g_value_get_int (value);
break;
case ARG_FPS:
monoscope->fps = g_value_get_int (value);
break;
default:
break;
}
}
static void
gst_monoscope_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
GstMonoscope *monoscope;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_MONOSCOPE (object));
monoscope = GST_MONOSCOPE (object);
switch (prop_id) {
case ARG_WIDTH:
g_value_set_int (value, monoscope->width);
break;
case ARG_HEIGHT:
g_value_set_int (value, monoscope->height);
break;
case ARG_FPS:
g_value_set_int (value, monoscope->fps);
break;
default:
break;
}
}
static gboolean
plugin_init (GModule *module, GstPlugin *plugin)
{
GstElementFactory *factory;
/* create an elementfactory for the monoscope element */
factory = gst_element_factory_new("monoscope",GST_TYPE_MONOSCOPE,
&gst_monoscope_details);
g_return_val_if_fail(factory != NULL, FALSE);
gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (src_template));
gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (sink_template));
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
return TRUE;
}
GstPluginDesc plugin_desc = {
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"monoscope",
plugin_init
};