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-rw-r--r--gst/monoscope/gstmonoscope.c367
1 files changed, 367 insertions, 0 deletions
diff --git a/gst/monoscope/gstmonoscope.c b/gst/monoscope/gstmonoscope.c
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+++ b/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[2][512];
+
+ // video state
+ gint fps;
+ gint width;
+ gint height;
+ gboolean first_buffer;
+};
+
+struct _GstMonoscopeClass {
+ GstElementClass parent_class;
+};
+
+GType gst_monoscope_get_type(void);
+
+
+/* elementfactory information */
+static GstElementDetails gst_monoscope_details = {
+ "Monoscope",
+ "Filter/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_PADTEMPLATE_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_PADTEMPLATE_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_PADTEMPLATE_GET (sink_template ), "sink");
+ monoscope->srcpad = gst_pad_new_from_template (
+ GST_PADTEMPLATE_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\n");
+
+ samples_in = GST_BUFFER_SIZE (bufin) / sizeof (gint16);
+
+ GST_DEBUG (0, "input buffer has %d samples\n", 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\n", GST_BUFFER_TIMESTAMP (bufin), monoscope->next_time);
+ gst_buffer_unref (bufin);
+ return;
+ }
+
+ data = (gint16 *) GST_BUFFER_DATA (bufin);
+ for (i=0; i < 512; i++) {
+ monoscope->datain[0][i] = *data++;
+ monoscope->datain[1][i] = *data++;
+ }
+
+ if (monoscope->first_buffer) {
+ GstCaps *caps;
+
+ monoscope_init (monoscope->width, monoscope->height);
+
+ GST_DEBUG (0, "making new pad\n");
+
+ 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)) {
+ 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->datain);
+ GST_BUFFER_TIMESTAMP (bufout) = monoscope->next_time;
+ GST_BUFFER_FLAG_SET (bufout, GST_BUFFER_DONTFREE);
+
+ monoscope->next_time += 1000000LL / monoscope->fps;
+
+ gst_pad_push (monoscope->srcpad, bufout);
+
+ gst_buffer_unref (bufin);
+
+ GST_DEBUG (0, "Monoscope: exiting chainfunc\n");
+
+}
+
+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_elementfactory_new("monoscope",GST_TYPE_MONOSCOPE,
+ &gst_monoscope_details);
+ g_return_val_if_fail(factory != NULL, FALSE);
+
+ gst_elementfactory_add_padtemplate (factory, GST_PADTEMPLATE_GET (src_template));
+ gst_elementfactory_add_padtemplate (factory, GST_PADTEMPLATE_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
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-24 19:11:42 +0000