gstreamer/gst/chart/gstchart.c

405 lines
11 KiB
C
Raw Normal View History

/* gstchart.c: implementation of chart drawing element
* Copyright (C) <2001> 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/video/video.h>
#define GST_TYPE_CHART (gst_chart_get_type())
#define GST_CHART(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_CHART,GstChart))
#define GST_CHART_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_CHART,GstChart))
#define GST_IS_CHART(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_CHART))
#define GST_IS_CHART_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_CHART))
typedef struct _GstChart GstChart;
typedef struct _GstChartClass GstChartClass;
struct _GstChart
{
GstElement element;
/* pads */
GstPad *sinkpad, *srcpad;
/* the timestamp of the next frame */
guint64 next_time;
/* video state */
gint bpp;
gint depth;
gint width;
gint height;
gint samplerate;
gdouble framerate; /* desired frame rate */
gint samples_between_frames; /* number of samples between start of successive frames */
gint samples_since_last_frame; /* number of samples between start of successive frames */
};
struct _GstChartClass
{
GstElementClass parent_class;
};
GType gst_chart_get_type (void);
/* elementfactory information */
static GstElementDetails gst_chart_details = {
"chart drawer",
"Visualization",
"Takes frames of data and outputs video frames of a chart of data",
"Richard Boulton <richard@tartarus.org>",
};
/* signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0,
/* FILL ME */
};
static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB_16)
);
static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-raw-int, "
"endianness = (int) BYTE_ORDER, "
"signed = (boolean) TRUE, "
"width = (int) 16, "
"depth = (int) 16, "
"rate = (int) [ 8000, 96000 ], " "channels = (int) 1")
);
static void gst_chart_base_init (gpointer g_class);
static void gst_chart_class_init (GstChartClass * klass);
static void gst_chart_init (GstChart * chart);
static void gst_chart_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_chart_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_chart_chain (GstPad * pad, GstData * _data);
static GstPadLinkReturn
gst_chart_sinkconnect (GstPad * pad, const GstCaps * caps);
static GstPadLinkReturn
gst_chart_srcconnect (GstPad * pad, const GstCaps * caps);
static GstElementClass *parent_class = NULL;
GType
gst_chart_get_type (void)
{
static GType type = 0;
if (!type) {
static const GTypeInfo info = {
sizeof (GstChartClass),
gst_chart_base_init,
NULL,
(GClassInitFunc) gst_chart_class_init,
NULL,
NULL,
sizeof (GstChart),
0,
(GInstanceInitFunc) gst_chart_init,
};
type = g_type_register_static (GST_TYPE_ELEMENT, "GstChart", &info, 0);
}
return type;
}
static void
gst_chart_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_factory));
gst_element_class_set_details (element_class, &gst_chart_details);
}
static void
gst_chart_class_init (GstChartClass * 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_chart_set_property;
gobject_class->get_property = gst_chart_get_property;
}
static void
gst_chart_init (GstChart * chart)
{
/* create the sink and src pads */
chart->sinkpad =
gst_pad_new_from_template (gst_static_pad_template_get (&sink_factory),
"sink");
chart->srcpad =
gst_pad_new_from_template (gst_static_pad_template_get (&src_factory),
"src");
gst_element_add_pad (GST_ELEMENT (chart), chart->sinkpad);
gst_element_add_pad (GST_ELEMENT (chart), chart->srcpad);
gst_pad_set_chain_function (chart->sinkpad, gst_chart_chain);
gst_pad_set_link_function (chart->sinkpad, gst_chart_sinkconnect);
gst_pad_set_link_function (chart->srcpad, gst_chart_srcconnect);
chart->next_time = 0;
/* reset the initial video state */
chart->bpp = 16;
chart->depth = 16;
chart->width = 256;
chart->height = 128;
chart->samplerate = -1;
chart->framerate = 25; /* desired frame rate */
chart->samples_between_frames = 0; /* number of samples between start of successive frames */
chart->samples_since_last_frame = 0;
}
static GstPadLinkReturn
gst_chart_sinkconnect (GstPad * pad, const GstCaps * caps)
{
GstChart *chart;
GstStructure *structure;
chart = GST_CHART (gst_pad_get_parent (pad));
structure = gst_caps_get_structure (caps, 0);
gst_structure_get_int (structure, "rate", &chart->samplerate);
chart->samples_between_frames = chart->samplerate / chart->framerate;
GST_DEBUG ("CHART: new sink caps: rate %d", chart->samplerate);
/*gst_chart_sync_parms (chart); */
/* */
return GST_PAD_LINK_OK;
}
static GstPadLinkReturn
gst_chart_srcconnect (GstPad * pad, const GstCaps * caps)
{
GstChart *chart;
GstStructure *structure;
chart = GST_CHART (gst_pad_get_parent (pad));
structure = gst_caps_get_structure (caps, 0);
if (!gst_structure_get_double (structure, "framerate", &chart->framerate) ||
!gst_structure_get_int (structure, "width", &chart->width) ||
!gst_structure_get_int (structure, "height", &chart->height))
return GST_PAD_LINK_REFUSED;
chart->samples_between_frames = chart->samplerate / chart->framerate;
GST_DEBUG ("CHART: new src caps: framerate %f, %dx%d",
chart->framerate, chart->width, chart->height);
return GST_PAD_LINK_OK;
}
static void
draw_chart_16bpp (guchar * output, gint width, gint height,
gint16 * src_data, gint src_size)
{
gint i;
guint16 *colstart;
gint16 *in;
GST_DEBUG
("CHART: drawing frame to %p, width = %d, height = %d, src_data = %p, src_size = %d",
output, width, height, src_data, src_size);
for (colstart = (guint16 *) output, in = (gint16 *) src_data, i = 0;
i < width; colstart++, in++, i++) {
guint16 *pos = colstart;
gint h1;
h1 = (((gint) (*in)) * height / (1 << 16)) + height / 2;
if (h1 >= height)
h1 = height;
if (h1 < height / 2) {
while (pos < colstart + h1 * width) {
*pos = 0x0000;
pos += width;
}
while (pos < colstart + height / 2 * width) {
*pos = 0x07e0;
pos += width;
}
while (pos < colstart + height * width) {
*pos = 0x0000;
pos += width;
}
} else {
while (pos < colstart + height / 2 * width) {
*pos = 0x0000;
pos += width;
}
while (pos < colstart + h1 * width) {
*pos = 0x07e0;
pos += width;
}
while (pos < colstart + height * width) {
*pos = 0x0000;
pos += width;
}
}
}
}
static void
gst_chart_chain (GstPad * pad, GstData * _data)
{
GstBuffer *bufin = GST_BUFFER (_data);
GstChart *chart;
GstBuffer *bufout;
guint32 samples_in;
guint32 sizeout;
gint16 *datain;
guchar *dataout;
g_return_if_fail (bufin != NULL);
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (GST_IS_CHART (GST_OBJECT_PARENT (pad)));
chart = GST_CHART (GST_OBJECT_PARENT (pad));
g_return_if_fail (chart != NULL);
GST_DEBUG ("CHART: chainfunc called");
samples_in = GST_BUFFER_SIZE (bufin) / sizeof (gint16);
datain = (gint16 *) (GST_BUFFER_DATA (bufin));
GST_DEBUG ("input buffer has %d samples", samples_in);
if (chart->next_time <= GST_BUFFER_TIMESTAMP (bufin)) {
chart->next_time = GST_BUFFER_TIMESTAMP (bufin);
GST_DEBUG ("in: %" G_GINT64_FORMAT, GST_BUFFER_TIMESTAMP (bufin));
}
chart->samples_since_last_frame += samples_in;
if (chart->samples_between_frames <= chart->samples_since_last_frame) {
chart->samples_since_last_frame = 0;
/* get data to draw into buffer */
if (samples_in >= chart->width) {
/* make a new buffer for the output */
bufout = gst_buffer_new ();
sizeout = chart->bpp / 8 * chart->width * chart->height;
dataout = g_malloc (sizeout);
GST_BUFFER_SIZE (bufout) = sizeout;
GST_BUFFER_DATA (bufout) = dataout;
GST_DEBUG ("CHART: made new buffer: size %d, width %d, height %d",
sizeout, chart->width, chart->height);
/* take data and draw to new buffer */
/* FIXME: call different routines for different properties */
draw_chart_16bpp (dataout, chart->width, chart->height, (gint16 *) datain,
samples_in);
gst_buffer_unref (bufin);
/* set timestamp */
GST_BUFFER_TIMESTAMP (bufout) = chart->next_time;
GST_DEBUG ("CHART: outputting buffer");
/* output buffer */
GST_BUFFER_FLAG_SET (bufout, GST_BUFFER_READONLY);
gst_pad_push (chart->srcpad, GST_DATA (bufout));
}
} else {
GST_DEBUG ("CHART: skipping buffer");
gst_buffer_unref (bufin);
}
GST_DEBUG ("CHART: exiting chainfunc");
}
static void
gst_chart_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
GstChart *chart;
g_return_if_fail (GST_IS_CHART (object));
chart = GST_CHART (object);
switch (prop_id) {
default:
break;
}
}
static void
gst_chart_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstChart *chart;
g_return_if_fail (GST_IS_CHART (object));
chart = GST_CHART (object);
switch (prop_id) {
default:
break;
}
}
static gboolean
plugin_init (GstPlugin * plugin)
{
if (!gst_element_register (plugin, "chart", GST_RANK_NONE, GST_TYPE_CHART))
return FALSE;
return TRUE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"chart",
"Takes frames of data and outputs video frames of a chart of data",
plugin_init, VERSION, "LGPL", GST_PACKAGE, GST_ORIGIN)