gstreamer/gst/elements/gstsinesrc.c
Wim Taymans bf8c785fb0 Documentation updates. All standard library objects and standard elements are documented. Modified some of the elemen...
Original commit message from CVS:
Documentation updates. All standard library objects and standard
elements are documented. Modified some of the elements to more
accuratly report about their arguments so the documentation builds
more reasonable output.
Added aviencoder and jpegencoder elements (not working yet)
2000-03-27 19:53:43 +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);
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;
}