gstreamer/gst/elements/gstsinesrc.c

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/* Gnome-Streamer
* 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.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/soundcard.h>
#include <math.h>
#include <stdlib.h>
#include <gstsinesrc.h>
GstElementDetails gst_sinesrc_details = {
"Sine-wave src",
"Source/Audio",
"Create a sine wave of a given frequency and volume",
VERSION,
"Erik Walthinsen <omega@cse.ogi.edu>",
"(C) 1999",
};
/* SineSrc signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
ARG_VOLUME,
ARG_FORMAT,
ARG_CHANNELS,
ARG_FREQUENCY,
};
static void gst_sinesrc_class_init(GstSineSrcClass *klass);
static void gst_sinesrc_init(GstSineSrc *sinesrc);
static void gst_sinesrc_set_arg(GtkObject *object,GtkArg *arg,guint id);
static void gst_sinesrc_get_arg(GtkObject *object,GtkArg *arg,guint id);
//static gboolean gst_sinesrc_change_state(GstElement *element,
// GstElementState state);
//static void gst_sinesrc_close_audio(GstSineSrc *src);
//static gboolean gst_sinesrc_open_audio(GstSineSrc *src);
void gst_sinesrc_sync_parms(GstSineSrc *sinesrc);
void gst_sinesrc_push(GstSrc *src);
static GstSrcClass *parent_class = NULL;
//static guint gst_sinesrc_signals[LAST_SIGNAL] = { 0 };
GtkType
gst_sinesrc_get_type(void) {
static GtkType sinesrc_type = 0;
if (!sinesrc_type) {
static const GtkTypeInfo sinesrc_info = {
"GstSineSrc",
sizeof(GstSineSrc),
sizeof(GstSineSrcClass),
(GtkClassInitFunc)gst_sinesrc_class_init,
(GtkObjectInitFunc)gst_sinesrc_init,
(GtkArgSetFunc)gst_sinesrc_set_arg,
(GtkArgGetFunc)gst_sinesrc_get_arg,
(GtkClassInitFunc)NULL,
};
sinesrc_type = gtk_type_unique(GST_TYPE_SRC,&sinesrc_info);
}
return sinesrc_type;
}
static void
gst_sinesrc_class_init(GstSineSrcClass *klass) {
GtkObjectClass *gtkobject_class;
GstElementClass *gstelement_class;
GstSrcClass *gstsrc_class;
gtkobject_class = (GtkObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
gstsrc_class = (GstSrcClass*)klass;
parent_class = gtk_type_class(GST_TYPE_SRC);
gtk_object_add_arg_type("GstSineSrc::volume", GTK_TYPE_DOUBLE,
GTK_ARG_READWRITE, ARG_VOLUME);
gtk_object_add_arg_type("GstSineSrc::format", GTK_TYPE_INT,
GTK_ARG_READWRITE, ARG_FORMAT);
gtk_object_add_arg_type("GstSineSrc::channels", GTK_TYPE_INT,
GTK_ARG_READWRITE, ARG_CHANNELS);
gtk_object_add_arg_type("GstSineSrc::frequency", GTK_TYPE_INT,
GTK_ARG_READWRITE, ARG_FREQUENCY);
gtkobject_class->set_arg = gst_sinesrc_set_arg;
gtkobject_class->get_arg = gst_sinesrc_get_arg;
// gstelement_class->change_state = gst_sinesrc_change_state;
gstsrc_class->push = gst_sinesrc_push;
}
static void gst_sinesrc_init(GstSineSrc *sinesrc) {
sinesrc->srcpad = gst_pad_new("src",GST_PAD_SRC);
gst_element_add_pad(GST_ELEMENT(sinesrc),sinesrc->srcpad);
sinesrc->volume = 1.0;
sinesrc->format = AFMT_S16_LE;
sinesrc->channels = 2;
sinesrc->frequency = 44100;
sinesrc->seq = 0;
sinesrc->sentmeta = FALSE;
}
GstElement *gst_sinesrc_new(gchar *name) {
GstElement *sinesrc = GST_ELEMENT(gtk_type_new(GST_TYPE_SINESRC));
gst_element_set_name(GST_ELEMENT(sinesrc),name);
return sinesrc;
}
GstElement *gst_sinesrc_new_with_fd(gchar *name,gchar *filename) {
GstElement *sinesrc = gst_sinesrc_new(name);
gtk_object_set(GTK_OBJECT(sinesrc),"location",filename,NULL);
return sinesrc;
}
void gst_sinesrc_push(GstSrc *src) {
GstSineSrc *sinesrc;
GstBuffer *buf;
gint16 *samples;
gint i;
gint volume;
gdouble val;
g_return_if_fail(src != NULL);
g_return_if_fail(GST_IS_SINESRC(src));
sinesrc = GST_SINESRC(src);
buf = gst_buffer_new();
g_return_if_fail(buf);
GST_BUFFER_DATA(buf) = (gpointer)malloc(4096);
samples = (gint16*)GST_BUFFER_DATA(buf);
GST_BUFFER_SIZE(buf) = 4096;
volume = 65535 * sinesrc->volume;
for (i=0;i<1024;i++) {
val = sin((gdouble)i/sinesrc->frequency);
samples[i] = val * volume;
samples[i+1] = samples[i];
}
if (!sinesrc->sentmeta) {
MetaAudioRaw *newmeta = g_new(MetaAudioRaw,1);
memcpy(newmeta,&sinesrc->meta,sizeof(MetaAudioRaw));
gst_buffer_add_meta(buf,GST_META(newmeta));
sinesrc->sentmeta = TRUE;
}
gst_pad_push(sinesrc->srcpad,buf);
g_print(">");
}
static void gst_sinesrc_set_arg(GtkObject *object,GtkArg *arg,guint id) {
GstSineSrc *src;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail(GST_IS_SINESRC(object));
src = GST_SINESRC(object);
switch (id) {
case ARG_VOLUME:
src->volume = GTK_VALUE_DOUBLE(*arg);
break;
case ARG_FORMAT:
src->format = GTK_VALUE_INT(*arg);
break;
case ARG_CHANNELS:
src->channels = GTK_VALUE_INT(*arg);
break;
case ARG_FREQUENCY:
src->frequency = GTK_VALUE_INT(*arg);
break;
default:
break;
}
}
static void gst_sinesrc_get_arg(GtkObject *object,GtkArg *arg,guint id) {
GstSineSrc *src;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail(GST_IS_SINESRC(object));
src = GST_SINESRC(object);
switch (id) {
case ARG_VOLUME:
GTK_VALUE_DOUBLE(*arg) = src->volume;
break;
case ARG_FORMAT:
GTK_VALUE_INT(*arg) = src->format;
break;
case ARG_CHANNELS:
GTK_VALUE_INT(*arg) = src->channels;
break;
case ARG_FREQUENCY:
GTK_VALUE_INT(*arg) = src->frequency;
break;
default:
arg->type = GTK_TYPE_INVALID;
break;
}
}
/*
static gboolean gst_sinesrc_change_state(GstElement *element,
GstElementState state) {
g_return_if_fail(GST_IS_SINESRC(element));
switch (state) {
case GST_STATE_RUNNING:
if (!gst_sinesrc_open_audio(GST_SINESRC(element)))
return FALSE;
break;
case ~GST_STATE_RUNNING:
gst_sinesrc_close_audio(GST_SINESRC(element));
break;
default:
break;
}
if (GST_ELEMENT_CLASS(parent_class)->change_state)
return GST_ELEMENT_CLASS(parent_class)->change_state(element,state);
return TRUE;
}
*/
void gst_sinesrc_sync_parms(GstSineSrc *sinesrc) {
sinesrc->meta.format = sinesrc->format;
sinesrc->meta.channels = sinesrc->channels;
sinesrc->meta.frequency = sinesrc->frequency;
sinesrc->sentmeta = FALSE;
}