gstreamer/gst/elements/gstsinesrc.c
Erik Walthinsen c287566d0c Massive scheduling changes (again). Not entirely complete, but getting closer. Need to think about various scheduli...
Original commit message from CVS:
Massive scheduling changes (again).  Not entirely complete, but getting
closer.  Need to think about various scheduling plans that we might want
to produce, and figure out the rules for what is legal, and how to get
the results we need as far as the plan.
2000-12-20 09:39:43 +00:00

261 lines
7 KiB
C

/* 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);
static GstBuffer * gst_sinesrc_get(GstPad *pad);
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;
}
static void gst_sinesrc_init(GstSineSrc *sinesrc) {
sinesrc->srcpad = gst_pad_new("src",GST_PAD_SRC);
gst_pad_set_get_function(sinesrc->srcpad,gst_sinesrc_get);
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;
}
static GstBuffer *
gst_sinesrc_get(GstPad *pad)
{
GstSineSrc *src;
GstBuffer *buf;
gint16 *samples;
gint i;
gint volume;
gdouble val;
g_return_val_if_fail (pad != NULL, NULL);
src = GST_SINESRC(gst_pad_get_parent(pad));
buf = gst_buffer_new();
g_return_val_if_fail (buf, NULL);
GST_BUFFER_DATA(buf) = (gpointer)malloc(4096);
samples = (gint16*)GST_BUFFER_DATA(buf);
GST_BUFFER_SIZE(buf) = 4096;
volume = 65535 * src->volume;
for (i=0;i<1024;i++) {
val = sin((gdouble)i/src->frequency);
samples[i] = val * volume;
samples[i+1] = samples[i];
}
if (!src->sentmeta) {
MetaAudioRaw *newmeta = g_new(MetaAudioRaw,1);
memcpy(newmeta,&src->meta,sizeof(MetaAudioRaw));
gst_buffer_add_meta(buf,GST_META(newmeta));
src->sentmeta = TRUE;
}
g_print(">");
return buf;
}
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;
}