gstreamer/testsuite/alsa/sinesrc.c

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/*
* Copyright (C) 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
*
* sinesrc.c: An elemnt emitting a sine src in lots of different formats
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "sinesrc.h"
#include <math.h>
#include <string.h> /* memcpy */
#define SAMPLES_PER_WAVE 200
static GstStaticPadTemplate sinesrc_src_factory =
GST_STATIC_PAD_TEMPLATE (
"src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (
"audio/x-raw-int, "
"endianness = (int) { LITTLE_ENDIAN, BIG_ENDIAN }, "
"signed = (boolean) { FALSE, TRUE }, "
"width = (int) [8, 32], "
"depth = (int) [8, 32], "
"rate = (int) [8000, 192000], "
"channels = (int) [1, 16];"
"audio/x-raw-float, "
"endianness = (int) BYTE_ORDER, "
"width = (int) {32, 64}, "
"rate = (int) [8000, 192000], "
"channels = (int) [1, 16]"
)
);
static GstElementClass *parent_class = NULL;
static void sinesrc_init (SineSrc *src);
static void sinesrc_class_init (SineSrcClass *klass);
static GstData * sinesrc_get (GstPad *pad);
static GstElementStateReturn sinesrc_change_state (GstElement *element);
GType
sinesrc_get_type (void)
{
static GType sinesrc_type = 0;
if (!sinesrc_type) {
static const GTypeInfo sinesrc_info = {
sizeof (SineSrcClass), NULL, NULL,
(GClassInitFunc) sinesrc_class_init, NULL, NULL,
sizeof (SineSrc), 0,
(GInstanceInitFunc) sinesrc_init,
};
sinesrc_type = g_type_register_static (GST_TYPE_ELEMENT, "SineSrc",
&sinesrc_info, 0);
}
return sinesrc_type;
}
static void
sinesrc_class_init (SineSrcClass *klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
element_class->change_state = sinesrc_change_state;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
}
static void
sinesrc_init (SineSrc *src)
{
src->src = gst_pad_new_from_template (
gst_static_pad_template_get (&sinesrc_src_factory), "src");
gst_element_add_pad (GST_ELEMENT(src), src->src);
gst_pad_set_get_function (src->src, sinesrc_get);
src->width = 16;
src->depth = 16;
src->sign = TRUE;
src->endianness = G_BYTE_ORDER;
src->rate = 44100;
src->channels = 1;
src->type = SINE_SRC_INT;
src->newcaps = TRUE;
src->pre_get_func = NULL;
GST_OBJECT (src)->name = "sinesrc";
}
static void
sinesrc_force_caps (SineSrc *src) {
GstCaps *caps;
if (!src->newcaps)
return;
src->newcaps = FALSE;
switch (src->type) {
case SINE_SRC_INT:
caps = gst_caps_new_simple ("audio/x-raw-int",
"signed", G_TYPE_BOOLEAN, src->sign,
"depth", G_TYPE_INT, src->depth,
NULL);
if (src->width > 8)
gst_caps_set_simple (caps,
"endianness", G_TYPE_INT, src->endianness,
NULL);
break;
case SINE_SRC_FLOAT:
g_assert (src->width == 32 || src->width == 64);
caps = gst_caps_new_simple ("audio/x-raw-float",
"endianness", G_TYPE_INT, src->endianness,
NULL);
break;
default:
caps = NULL;
g_assert_not_reached();
}
gst_caps_set_simple (caps,
"width", G_TYPE_INT, src->width,
"rate", G_TYPE_INT, src->rate,
"channels", G_TYPE_INT, src->channels,
NULL);
g_assert (gst_pad_try_set_caps (src->src, caps) == GST_PAD_LINK_OK);
}
/* always return 1 wave
* there are 200 waves in 1 second, so the frequency is samplerate/200
*/
static guint8 UIDENTITY(guint8 x) { return x; };
static gint8 IDENTITY(gint8 x) { return x; };
#define POPULATE(format, be_func, le_func) {\
format val = (format) int_value;\
switch (src->endianness) {\
case G_LITTLE_ENDIAN:\
val = le_func (val);\
break;\
case G_BIG_ENDIAN:\
val = be_func (val);\
break;\
default: \
g_assert_not_reached ();\
};\
format* p = data;\
for (j = 0; j < src->channels; j++) {\
*p = val;\
p ++;\
}\
data = p;\
}
static GstData *
sinesrc_get (GstPad *pad)
{
GstBuffer *buf;
SineSrc *src;
void *data;
gint i, j;
gdouble value;
g_return_val_if_fail (pad != NULL, NULL);
src = SINESRC(gst_pad_get_parent (pad));
if (src->pre_get_func)
src->pre_get_func (src);
g_assert ((buf = gst_buffer_new_and_alloc ((src->width / 8) * src->channels * SAMPLES_PER_WAVE)));
g_assert ((data = GST_BUFFER_DATA(buf)));
for (i = 0; i < SAMPLES_PER_WAVE; i++) {
value = sin (i * 2 * M_PI / SAMPLES_PER_WAVE);
switch (src->type) {
case SINE_SRC_INT: {
gint64 int_value = (value + (src->sign ? 0 : 1)) * (((guint64) 1) << (src->depth - 1));
if (int_value == (1 + (src->sign ? 0 : 1)) * (((guint64) 1) << (src->depth - 1))) int_value--;
switch (src->width) {
case 8:
if (src->sign)
POPULATE (gint8, IDENTITY, IDENTITY)
else
POPULATE (guint8, UIDENTITY, UIDENTITY)
break;
case 16:
if (src->sign)
POPULATE (gint16, GINT16_TO_BE, GINT16_TO_LE)
else
POPULATE (guint16, GUINT16_TO_BE, GUINT16_TO_LE)
break;
case 24:
if (src->sign) {
gpointer p;
gint32 val = (gint32) int_value;
switch (src->endianness) {
case G_LITTLE_ENDIAN:
val = GINT32_TO_LE (val);
break;
case G_BIG_ENDIAN:
val = GINT32_TO_BE (val);
break;
default:
g_assert_not_reached ();
};
p = &val;
if (src->endianness == G_BIG_ENDIAN)
p++;
for (j = 0; j < src->channels; j++) {
memcpy (data, p, 3);
data += 3;
}
} else {
gpointer p;
guint32 val = (guint32) int_value;
switch (src->endianness) {
case G_LITTLE_ENDIAN:
val = GUINT32_TO_LE (val);
break;
case G_BIG_ENDIAN:
val = GUINT32_TO_BE (val);
break;
default:
g_assert_not_reached ();
};
p = &val;
if (src->endianness == G_BIG_ENDIAN)
p++;
for (j = 0; j < src->channels; j++) {
memcpy (data, p, 3);
data += 3;
}
}
break;
case 32:
if (src->sign)
POPULATE (gint32, GINT32_TO_BE, GINT32_TO_LE)
else
POPULATE (guint32, GUINT32_TO_BE, GUINT32_TO_LE)
break;
default:
g_assert_not_reached ();
}
break;
}
case SINE_SRC_FLOAT:
if (src->width == 32) {
gfloat *p = (gfloat *) data;
gfloat fval = (gfloat) value;
for (j = 0; j < src->channels; j++) {
*p = fval;
p++;
}
data = p;
break;
}
if (src->width == 64) {
gdouble *p = (gdouble *) data;
for (j = 0; j < src->channels; j++) {
*p = value;
p++;
}
data = p;
break;
}
g_assert_not_reached ();
default:
g_assert_not_reached ();
}
}
if (src->newcaps) {
sinesrc_force_caps(src);
}
return GST_DATA(buf);
}
GstElement *
sinesrc_new (void)
{
return GST_ELEMENT (g_object_new (TYPE_SINESRC, NULL));
}
void
sinesrc_set_pre_get_func (SineSrc *src, PreGetFunc func)
{
src->pre_get_func = func;
}
static GstElementStateReturn
sinesrc_change_state (GstElement *element)
{
SineSrc *sinesrc;
g_return_val_if_fail (element != NULL, FALSE);
sinesrc = SINESRC (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_NULL_TO_READY:
case GST_STATE_READY_TO_PAUSED:
case GST_STATE_PAUSED_TO_PLAYING:
case GST_STATE_PLAYING_TO_PAUSED:
break;
case GST_STATE_PAUSED_TO_READY:
sinesrc->newcaps = TRUE;
break;
case GST_STATE_READY_TO_NULL:
break;
default:
g_assert_not_reached();
}
if (GST_ELEMENT_CLASS (parent_class)->change_state)
return GST_ELEMENT_CLASS (parent_class)->change_state (element);
return GST_STATE_SUCCESS;
}