gstreamer/gst/monoscope/gstmonoscope.c
Thomas Vander Stichele 51e5863a97 GST_ELEMENT_ERROR
Original commit message from CVS:
GST_ELEMENT_ERROR
2004-01-29 23:20:45 +00:00

273 lines
7.5 KiB
C

/* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/video/video.h>
#include <gst/audio/audio.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;
/* the timestamp of the next frame */
guint64 next_time;
gint16 datain[512];
/* video state */
gdouble 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",
"Richard Boulton <richard@tartarus.org>"
};
/* signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
/* FILL ME */
};
static GstStaticPadTemplate src_template =
GST_STATIC_PAD_TEMPLATE (
"src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_xRGB_HOST_ENDIAN)
);
static GstStaticPadTemplate sink_template =
GST_STATIC_PAD_TEMPLATE (
"sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_AUDIO_INT_STANDARD_PAD_TEMPLATE_CAPS)
);
static void gst_monoscope_class_init (GstMonoscopeClass *klass);
static void gst_monoscope_base_init (GstMonoscopeClass *klass);
static void gst_monoscope_init (GstMonoscope *monoscope);
static void gst_monoscope_chain (GstPad *pad, GstData *_data);
static GstPadLinkReturn
gst_monoscope_srcconnect (GstPad *pad, const 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),
(GBaseInitFunc) gst_monoscope_base_init,
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_base_init (GstMonoscopeClass *klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_template));
gst_element_class_set_details (element_class, &gst_monoscope_details);
}
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);
}
static void
gst_monoscope_init (GstMonoscope *monoscope)
{
/* create the sink and src pads */
monoscope->sinkpad = gst_pad_new_from_template (
gst_static_pad_template_get (&sink_template ), "sink");
monoscope->srcpad = gst_pad_new_from_template (
gst_static_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_link_function (monoscope->srcpad, gst_monoscope_srcconnect);
monoscope->next_time = 0;
/* reset the initial video state */
monoscope->first_buffer = TRUE;
monoscope->width = 256;
monoscope->height = 128;
monoscope->fps = 25.; /* desired frame rate */
}
static GstPadLinkReturn
gst_monoscope_srcconnect (GstPad *pad, const GstCaps *caps)
{
GstMonoscope *monoscope = GST_MONOSCOPE (gst_pad_get_parent (pad));
GstStructure *structure;
structure = gst_caps_get_structure (caps, 0);
gst_structure_get_int (structure, "width", &monoscope->width);
gst_structure_get_int (structure, "height", &monoscope->height);
gst_structure_get_double (structure, "framerate", &monoscope->fps);
return GST_PAD_LINK_OK;
}
static void
gst_monoscope_chain (GstPad *pad, GstData *_data)
{
GstBuffer *bufin = GST_BUFFER (_data);
GstMonoscope *monoscope;
GstBuffer *bufout;
guint32 samples_in;
gint16 *data;
gint i;
monoscope = GST_MONOSCOPE (gst_pad_get_parent (pad));
GST_DEBUG ("Monoscope: chainfunc called");
samples_in = GST_BUFFER_SIZE (bufin) / sizeof (gint16);
GST_DEBUG ("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 ("timestamp is %" G_GUINT64_FORMAT ": want >= %" G_GUINT64_FORMAT, 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) {
monoscope->visstate = monoscope_init (monoscope->width, monoscope->height);
g_assert(monoscope->visstate != 0);
GST_DEBUG ("making new pad");
if (!gst_pad_is_negotiated (monoscope->srcpad)) {
if (gst_pad_renegotiate (monoscope->srcpad) <= 0) {
GST_ELEMENT_ERROR (monoscope, CORE, NEGOTIATION, NULL, NULL);
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, GST_DATA (bufout));
gst_buffer_unref (bufin);
GST_DEBUG ("Monoscope: exiting chainfunc");
}
static gboolean
plugin_init (GstPlugin *plugin)
{
return gst_element_register(plugin, "monoscope",
GST_RANK_NONE, GST_TYPE_MONOSCOPE);
}
GST_PLUGIN_DEFINE (
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"monoscope",
"Monoscope visualization",
plugin_init,
VERSION,
"LGPL",
GST_PACKAGE,
GST_ORIGIN
)