gstreamer/plugins/elements/gstsinesrc.c
Erik Walthinsen e6a59c8a62 Merged HEAD from BRANCH-INCSCHED1-200104161 into BRANCH-INCSCHED1.
Original commit message from CVS:
Merged HEAD from BRANCH-INCSCHED1-200104161 into BRANCH-INCSCHED1.
2001-04-16 21:43:28 +00:00

328 lines
9.2 KiB
C

/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
* 2001 Steve Baker <stevebaker_org@yahoo.co.uk>
*
* gstsinesrc.c:
*
* 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 <math.h>
#include <stdlib.h>
#include <string.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_SAMPLERATE,
ARG_FREQ,
ARG_TABLESIZE,
ARG_BUFFER_SIZE,
};
static void gst_sinesrc_class_init(GstSineSrcClass *klass);
static void gst_sinesrc_init(GstSineSrc *src);
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);
static void gst_sinesrc_populate_sinetable(GstSineSrc *src);
static inline void gst_sinesrc_update_table_inc(GstSineSrc *src);
static inline void gst_sinesrc_update_vol_scale(GstSineSrc *src);
void gst_sinesrc_sync_parms(GstSineSrc *src);
static GstBuffer * gst_sinesrc_get(GstPad *pad);
static GstElementClass *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_ELEMENT,&sinesrc_info);
}
return sinesrc_type;
}
static void
gst_sinesrc_class_init(GstSineSrcClass *klass) {
GtkObjectClass *gtkobject_class;
GstElementClass *gstelement_class;
gtkobject_class = (GtkObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
parent_class = gtk_type_class(GST_TYPE_ELEMENT);
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::samplerate", GTK_TYPE_INT,
GTK_ARG_READWRITE, ARG_SAMPLERATE);
gtk_object_add_arg_type("GstSineSrc::tablesize", GTK_TYPE_INT,
GTK_ARG_READWRITE, ARG_TABLESIZE);
gtk_object_add_arg_type("GstSineSrc::freq", GTK_TYPE_DOUBLE,
GTK_ARG_READWRITE, ARG_FREQ);
gtk_object_add_arg_type("GstSineSrc::buffersize", GTK_TYPE_INT,
GTK_ARG_READWRITE, ARG_BUFFER_SIZE);
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 *src) {
src->srcpad = gst_pad_new("src",GST_PAD_SRC);
gst_pad_set_get_function(src->srcpad, gst_sinesrc_get);
gst_element_add_pad(GST_ELEMENT(src), src->srcpad);
src->volume = 1.0;
gst_sinesrc_update_vol_scale(src);
src->format = 16;
src->samplerate = 44100;
src->freq = 100.0;
src->newcaps = FALSE;
src->table_pos = 0.0;
src->table_size = 1024;
gst_sinesrc_populate_sinetable(src);
gst_sinesrc_update_table_inc(src);
gst_sinesrc_sync_parms(src);
src->buffer_size=1024;
src->seq = 0;
}
static GstBuffer *
gst_sinesrc_get(GstPad *pad)
{
GstSineSrc *src;
GstBuffer *buf;
gint16 *samples;
gint i;
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);
samples = g_new(gint16, src->buffer_size);
GST_BUFFER_DATA(buf) = (gpointer) samples;
GST_BUFFER_SIZE(buf) = 2 * src->buffer_size;
for (i=0 ; i < src->buffer_size; i++) {
src->table_lookup = (gint)(src->table_pos);
src->table_lookup_next = src->table_lookup + 1;
src->table_interp = src->table_pos - src->table_lookup;
// wrap the array lookups if we're out of bounds
if (src->table_lookup_next >= src->table_size){
src->table_lookup_next -= src->table_size;
if (src->table_lookup >= src->table_size){
src->table_lookup -= src->table_size;
src->table_pos -= src->table_size;
}
}
src->table_pos += src->table_inc;
//no interpolation
//samples[i] = src->table_data[src->table_lookup]
// * src->vol_scale;
//linear interpolation
samples[i] = ((src->table_interp
*(src->table_data[src->table_lookup_next]
-src->table_data[src->table_lookup]
)
)+src->table_data[src->table_lookup]
)* src->vol_scale;
}
if (src->newcaps) {
src->newcaps = FALSE;
}
//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:
if (GTK_VALUE_DOUBLE(*arg) < 0.0 || GTK_VALUE_DOUBLE(*arg) > 1.0)
break;
src->volume = GTK_VALUE_DOUBLE(*arg);
gst_sinesrc_update_vol_scale(src);
break;
case ARG_FORMAT:
src->format = GTK_VALUE_INT(*arg);
gst_sinesrc_sync_parms(src);
break;
case ARG_SAMPLERATE:
src->samplerate = GTK_VALUE_INT(*arg);
gst_sinesrc_sync_parms(src);
gst_sinesrc_update_table_inc(src);
break;
case ARG_FREQ: {
if (GTK_VALUE_DOUBLE(*arg) <= 0.0 || GTK_VALUE_DOUBLE(*arg) > src->samplerate/2)
break;
src->freq = GTK_VALUE_DOUBLE(*arg);
gst_sinesrc_update_table_inc(src);
break;
case ARG_TABLESIZE:
src->table_size = GTK_VALUE_INT(*arg);
gst_sinesrc_populate_sinetable(src);
gst_sinesrc_update_table_inc(src);
break;
case ARG_BUFFER_SIZE:
src->buffer_size = 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_SAMPLERATE:
GTK_VALUE_INT(*arg) = src->samplerate;
break;
case ARG_FREQ:
GTK_VALUE_DOUBLE(*arg) = src->freq;
break;
case ARG_TABLESIZE:
GTK_VALUE_INT(*arg) = src->table_size;
break;
case ARG_BUFFER_SIZE:
GTK_VALUE_INT(*arg) = src->buffer_size;
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;
}
*/
static void gst_sinesrc_populate_sinetable(GstSineSrc *src)
{
gint i;
gdouble pi2scaled = M_PI * 2 / src->table_size;
gfloat *table = g_new(gfloat, src->table_size);
for(i=0 ; i < src->table_size ; i++){
table[i] = (gfloat)sin(i * pi2scaled);
}
g_free(src->table_data);
src->table_data = table;
}
static inline void gst_sinesrc_update_table_inc(GstSineSrc *src)
{
src->table_inc = src->table_size * src->freq / src->samplerate;
}
static inline void gst_sinesrc_update_vol_scale(GstSineSrc *src)
{
src->vol_scale = 32767 * src->volume;
}
void gst_sinesrc_sync_parms(GstSineSrc *src) {
src->newcaps = TRUE;
}