gstreamer/gst/sine/gstsinesrc.c

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/* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <gst/control/control.h>
#include <gstsinesrc.h>
/* elementfactory information */
GstElementDetails gst_sinesrc_details = {
"Sine-wave src",
"Source/Audio",
"Create a sine wave of a given frequency and volume",
"Erik Walthinsen <omega@cse.ogi.edu>"
};
/* SineSrc signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
/* ARG_WIDTH, */ /* width is not even implemented so no use in having this */
ARG_SAMPLERATE,
ARG_TABLESIZE,
ARG_SAMPLES_PER_BUFFER,
ARG_FREQ,
ARG_VOLUME,
};
GST_PAD_TEMPLATE_FACTORY (sinesrc_src_factory,
"src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_CAPS_NEW (
"sinesrc_src",
"audio/x-raw-int",
"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, 48000),
"channels", GST_PROPS_INT (1)
)
);
static void gst_sinesrc_class_init (GstSineSrcClass *klass);
static void gst_sinesrc_base_init (GstSineSrcClass *klass);
static void gst_sinesrc_init (GstSineSrc *src);
static void gst_sinesrc_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gst_sinesrc_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
/*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_update_freq (const GValue *value,
gpointer data);
static void gst_sinesrc_populate_sinetable (GstSineSrc *src);
static inline void gst_sinesrc_update_table_inc (GstSineSrc *src);
static gboolean gst_sinesrc_force_caps (GstSineSrc *src);
static GstData* gst_sinesrc_get (GstPad *pad);
static GstElementClass *parent_class = NULL;
/*static guint gst_sinesrc_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_sinesrc_get_type (void)
{
static GType sinesrc_type = 0;
if (!sinesrc_type) {
static const GTypeInfo sinesrc_info = {
sizeof (GstSineSrcClass),
(GBaseInitFunc) gst_sinesrc_base_init, NULL,
(GClassInitFunc) gst_sinesrc_class_init, NULL, NULL,
sizeof (GstSineSrc), 0,
(GInstanceInitFunc) gst_sinesrc_init,
};
sinesrc_type = g_type_register_static (GST_TYPE_ELEMENT, "GstSineSrc",
&sinesrc_info, 0);
}
return sinesrc_type;
}
static void
gst_sinesrc_base_init (GstSineSrcClass *klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_add_pad_template (element_class,
GST_PAD_TEMPLATE_GET (sinesrc_src_factory));
gst_element_class_set_details (element_class, &gst_sinesrc_details);
}
static void
gst_sinesrc_class_init (GstSineSrcClass *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", "Width of audio data in bits",
1, 32, 0, G_PARAM_READWRITE));
*/
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_SAMPLERATE,
g_param_spec_int ("samplerate","Sample Rate","Sample Rate (in Hz)",
8000, 48000, 44100, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_TABLESIZE,
g_param_spec_int ("tablesize", "tablesize", "tablesize",
1, G_MAXINT, 1024, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass),
ARG_SAMPLES_PER_BUFFER,
g_param_spec_int ("samplesperbuffer", "Samples per buffer",
"Number of samples in each outgoing buffer",
1, G_MAXINT, 1024, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_FREQ,
g_param_spec_float ("freq", "Frequency", "Frequency of sine source",
0.0, 20000.0, 440.0, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_VOLUME,
g_param_spec_float ("volume", "Volume", "Volume",
0.0, 1.0, 0.8, G_PARAM_READWRITE));
gobject_class->set_property = gst_sinesrc_set_property;
gobject_class->get_property = gst_sinesrc_get_property;
/* gstelement_class->change_state = gst_sinesrc_change_state; */
}
static void
gst_sinesrc_init (GstSineSrc *src)
{
src->srcpad = gst_pad_new_from_template (
GST_PAD_TEMPLATE_GET (sinesrc_src_factory), "src");
gst_element_add_pad (GST_ELEMENT(src), src->srcpad);
gst_pad_set_get_function (src->srcpad, gst_sinesrc_get);
src->width = 16;
src->samplerate = 44100;
src->volume = 1.0;
src->freq = 440.0;
src->newcaps = TRUE;
src->table_pos = 0.0;
src->table_size = 1024;
src->samples_per_buffer=1024;
src->timestamp=0LL;
src->bufpool=NULL;
src->seq = 0;
src->dpman = gst_dpman_new ("sinesrc_dpman", GST_ELEMENT(src));
gst_dpman_add_required_dparam_callback (
src->dpman,
g_param_spec_float("freq","Frequency (Hz)","Frequency of the tone",
10.0, 10000.0, 350.0, G_PARAM_READWRITE),
"hertz",
gst_sinesrc_update_freq,
src
);
gst_dpman_add_required_dparam_direct (
src->dpman,
g_param_spec_float("volume","Volume","Volume of the tone",
0.0, 1.0, 0.8, G_PARAM_READWRITE),
"scalar",
&(src->volume)
);
gst_dpman_set_rate(src->dpman, src->samplerate);
gst_sinesrc_populate_sinetable(src);
gst_sinesrc_update_table_inc(src);
}
static GstData *
gst_sinesrc_get (GstPad *pad)
{
GstSineSrc *src;
GstBuffer *buf;
gint16 *samples;
gint i=0;
g_return_val_if_fail (pad != NULL, NULL);
src = GST_SINESRC(gst_pad_get_parent (pad));
if (src->bufpool == NULL) {
src->bufpool = gst_buffer_pool_get_default (2 * src->samples_per_buffer, 8);
}
buf = (GstBuffer *) gst_buffer_new_from_pool (src->bufpool, 0, 0);
GST_BUFFER_TIMESTAMP(buf) = src->timestamp;
samples = (gint16*)GST_BUFFER_DATA(buf);
GST_BUFFER_DATA(buf) = (gpointer) samples;
GST_DPMAN_PREPROCESS(src->dpman, src->samples_per_buffer, src->timestamp);
src->timestamp += (gint64)src->samples_per_buffer * GST_SECOND / (gint64)src->samplerate;
while(GST_DPMAN_PROCESS(src->dpman, i)) {
#if 0
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->volume * 32767.0; */
/*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->volume * 32767.0;
#endif
src->accumulator += 2*M_PI*src->freq / src->samplerate;
if(src->accumulator >= 2*M_PI){
src->accumulator -= 2*M_PI;
}
samples[i] = sin(src->accumulator) * src->volume * 32767.0;
i++;
}
if (src->newcaps) {
if (!gst_sinesrc_force_caps(src)) {
gst_element_error (GST_ELEMENT (src), "Could not set caps");
return NULL;
}
}
return GST_DATA (buf);
}
static void
gst_sinesrc_set_property (GObject *object, guint prop_id,
const GValue *value, GParamSpec *pspec)
{
GstSineSrc *src;
g_return_if_fail (GST_IS_SINESRC (object));
src = GST_SINESRC (object);
switch (prop_id) {
/*
case ARG_WIDTH:
src->width = g_value_get_int (value);
src->newcaps = TRUE;
break;
*/
case ARG_SAMPLERATE:
src->samplerate = g_value_get_int (value);
gst_dpman_set_rate (src->dpman, src->samplerate);
src->newcaps = TRUE;
gst_sinesrc_update_table_inc (src);
break;
case ARG_TABLESIZE:
src->table_size = g_value_get_int (value);
gst_sinesrc_populate_sinetable (src);
gst_sinesrc_update_table_inc (src);
break;
case ARG_SAMPLES_PER_BUFFER:
src->samples_per_buffer = g_value_get_int (value);
break;
case ARG_FREQ:
gst_dpman_bypass_dparam (src->dpman, "freq");
gst_sinesrc_update_freq (value, src);
break;
case ARG_VOLUME:
gst_dpman_bypass_dparam (src->dpman, "volume");
src->volume = g_value_get_float (value);
break;
default:
break;
}
}
static void
gst_sinesrc_get_property (GObject *object, guint prop_id,
GValue *value, GParamSpec *pspec)
{
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 (prop_id) {
/*
case ARG_WIDTH:
g_value_set_int (value, src->width);
break;
*/
case ARG_SAMPLERATE:
g_value_set_int (value, src->samplerate);
break;
case ARG_TABLESIZE:
g_value_set_int (value, src->table_size);
break;
case ARG_SAMPLES_PER_BUFFER:
g_value_set_int (value, src->samples_per_buffer);
break;
case ARG_FREQ:
g_value_set_float (value, src->freq);
break;
case ARG_VOLUME:
g_value_set_float (value, src->volume);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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 void
gst_sinesrc_update_freq (const GValue *value, gpointer data)
{
GstSineSrc *src = (GstSineSrc *) data;
g_return_if_fail (GST_IS_SINESRC (src));
src->freq = g_value_get_float (value);
src->table_inc = src->table_size * src->freq / src->samplerate;
/*GST_DEBUG ("freq %f", src->freq); */
}
static inline void
gst_sinesrc_update_table_inc (GstSineSrc *src)
{
src->table_inc = src->table_size * src->freq / src->samplerate;
}
static gboolean
gst_sinesrc_force_caps (GstSineSrc *src) {
GstCaps *caps;
if (!src->newcaps)
return TRUE;
caps = GST_CAPS_NEW (
"sinesrc_src_caps",
"audio/x-raw-int",
"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 (src->samplerate),
"channels", GST_PROPS_INT (1)
);
src->newcaps = gst_pad_try_set_caps (src->srcpad, caps) < GST_PAD_LINK_OK;
return !src->newcaps;
}
static gboolean
plugin_init (GstPlugin *plugin)
{
/* initialize dparam support library */
gst_control_init(NULL,NULL);
return gst_element_register (plugin, "sinesrc",
GST_RANK_NONE, GST_TYPE_SINESRC);
}
GST_PLUGIN_DEFINE (
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"sine",
"Sine audio wave generator",
plugin_init,
VERSION,
"LGPL",
GST_PACKAGE,
GST_ORIGIN
)