mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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91e18767bc
Original commit message from CVS: started tests for alsa. Doesn't work yet due to scheduler bugs, but I commit it anyway so everyone has it in Norway ;)
280 lines
8 KiB
C
280 lines
8 KiB
C
/*
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* Copyright (C) 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
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*
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* sinesrc.c: An elemnt emitting a sine src in lots of different formats
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <math.h>
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#include "sinesrc.h"
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#define SAMPLES_PER_WAVE 200
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GST_PAD_TEMPLATE_FACTORY (sinesrc_src_factory,
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"src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_CAPS_NEW (
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"sinesrc_int_src",
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"audio/raw",
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"format", GST_PROPS_STRING ("int"),
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"law", GST_PROPS_INT (0),
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"endianness", GST_PROPS_LIST (GST_PROPS_INT (G_LITTLE_ENDIAN), GST_PROPS_INT (G_BIG_ENDIAN)),
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"signed", GST_PROPS_LIST (GST_PROPS_BOOLEAN (FALSE), GST_PROPS_BOOLEAN (TRUE)),
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"width", GST_PROPS_INT_RANGE (8, 32),
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"depth", GST_PROPS_INT_RANGE (8, 32),
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"rate", GST_PROPS_INT_RANGE (8000, 192000),
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"channels", GST_PROPS_INT_RANGE (1, 16)
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),
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GST_CAPS_NEW (
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"sinesrc_float_src",
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"audio/raw",
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"format", GST_PROPS_STRING ("float"),
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"layout", GST_PROPS_LIST (GST_PROPS_STRING ("gfloat"), GST_PROPS_STRING ("gdouble")),
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"intercept", GST_PROPS_FLOAT (0),
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"slope", GST_PROPS_FLOAT (1),
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"channels", GST_PROPS_INT_RANGE (1, 16)
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)
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);
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static GstElementClass *parent_class = NULL;
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static void sinesrc_init (SineSrc *src);
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static void sinesrc_class_init (SineSrcClass *klass);
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static GstBuffer * sinesrc_get (GstPad *pad);
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GType
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sinesrc_get_type (void)
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{
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static GType sinesrc_type = 0;
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if (!sinesrc_type) {
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static const GTypeInfo sinesrc_info = {
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sizeof (SineSrcClass), NULL, NULL,
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(GClassInitFunc) sinesrc_class_init, NULL, NULL,
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sizeof (SineSrc), 0,
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(GInstanceInitFunc) sinesrc_init,
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};
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sinesrc_type = g_type_register_static (GST_TYPE_ELEMENT, "SineSrc",
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&sinesrc_info, 0);
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}
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return sinesrc_type;
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}
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static void
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sinesrc_class_init (SineSrcClass *klass)
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{
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parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
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}
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static void
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sinesrc_init (SineSrc *src)
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{
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src->src = gst_pad_new_from_template (
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GST_PAD_TEMPLATE_GET (sinesrc_src_factory), "src");
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gst_element_add_pad (GST_ELEMENT(src), src->src);
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gst_pad_set_get_function (src->src, sinesrc_get);
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src->width = 16;
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src->depth = 16;
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src->sign = TRUE;
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src->endianness = G_BYTE_ORDER;
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src->rate = 44100;
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src->channels = 1;
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src->type = SINE_SRC_INT;
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src->newcaps = TRUE;
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src->pre_get_func = NULL;
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GST_OBJECT (src)->name = "sinesrc";
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}
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static void
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sinesrc_force_caps (SineSrc *src) {
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GstCaps *caps;
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if (!src->newcaps)
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return;
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src->newcaps = FALSE;
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switch (src->type) {
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case SINE_SRC_INT:
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caps = GST_CAPS_NEW (
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"sinesrc_src_caps",
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"audio/raw",
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"format", GST_PROPS_STRING ("int"),
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"law", GST_PROPS_INT (0),
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"signed", GST_PROPS_BOOLEAN (src->sign),
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"width", GST_PROPS_INT (src->width),
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"depth", GST_PROPS_INT (src->depth)
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);
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if (src->width > 8)
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gst_props_add_entry (gst_caps_get_props (caps),
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gst_props_entry_new ("endianness",
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GST_PROPS_INT (src->endianness)));
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break;
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case SINE_SRC_FLOAT:
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g_assert (src->width == 32 || src->width == 64);
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caps = GST_CAPS_NEW (
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"sinesrc_src_caps",
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"audio/raw",
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"format", GST_PROPS_STRING ("float"),
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"intercept", GST_PROPS_FLOAT (0),
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"slope", GST_PROPS_FLOAT (1)
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);
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if (src->width == 32) {
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gst_props_add_entry (gst_caps_get_props (caps),
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gst_props_entry_new ("layout",
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GST_PROPS_STRING ("gfloat")));
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} else if (src->width == 64) {
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gst_props_add_entry (gst_caps_get_props (caps),
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gst_props_entry_new ("layout",
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GST_PROPS_STRING ("gdouble")));
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} else {
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g_assert_not_reached ();
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}
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break;
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default:
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g_assert_not_reached();
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}
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gst_props_add_entry (gst_caps_get_props (caps),
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gst_props_entry_new ("rate", GST_PROPS_INT (src->rate)));
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gst_props_add_entry (gst_caps_get_props (caps),
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gst_props_entry_new ("channels", GST_PROPS_INT (src->channels)));
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g_assert (gst_pad_try_set_caps (src->src, caps) == GST_PAD_LINK_OK);
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}
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/* always return 1 wave
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* there are 200 waves in 1 second, so the frequency is samplerate/200
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*/
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static guint8 UIDENTITY(guint8 x) { return x; };
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static gint8 IDENTITY(gint8 x) { return x; };
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#define POPULATE(format, be_func, le_func) {\
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format val = (format) int_value;\
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switch (src->endianness) {\
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case G_LITTLE_ENDIAN:\
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val = le_func (val);\
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break;\
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case G_BIG_ENDIAN:\
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val = be_func (val);\
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break;\
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default: \
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g_assert_not_reached ();\
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};\
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format* p = data;\
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for (j = 0; j < src->channels; j++) {\
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*p = val;\
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p ++;\
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}\
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data = p;\
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}
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static GstBuffer *
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sinesrc_get (GstPad *pad)
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{
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GstBuffer *buf;
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SineSrc *src;
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void *data;
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gint i, j;
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gdouble value;
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g_return_val_if_fail (pad != NULL, NULL);
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src = SINESRC(gst_pad_get_parent (pad));
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if (src->pre_get_func)
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src->pre_get_func (src);
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g_assert ((buf = gst_buffer_new_and_alloc ((src->width / 8) * src->channels * SAMPLES_PER_WAVE)));
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g_assert ((data = GST_BUFFER_DATA(buf)));
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for (i = 0; i < SAMPLES_PER_WAVE; i++) {
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value = sin (i * 2 * M_PI / SAMPLES_PER_WAVE);
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switch (src->type) {
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case SINE_SRC_INT: {
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gint64 int_value = (value + (src->sign ? 0 : 1)) * (((guint64) 1) << (src->depth - 1));
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if (int_value == (1 + (src->sign ? 0 : 1)) * (((guint64) 1) << (src->depth - 1))) int_value--;
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switch (src->width) {
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case 8:
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if (src->sign)
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POPULATE (gint8, IDENTITY, IDENTITY)
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else
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POPULATE (guint8, UIDENTITY, UIDENTITY)
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break;
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case 16:
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if (src->sign)
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POPULATE (gint16, GINT16_TO_BE, GINT16_TO_LE)
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else
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POPULATE (guint16, GUINT16_TO_BE, GUINT16_TO_LE)
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break;
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case 24:
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/* mom, can I have gint24 plz? */
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g_assert_not_reached ();
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break;
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case 32:
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if (src->sign)
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POPULATE (gint32, GINT32_TO_BE, GINT32_TO_LE)
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else
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POPULATE (guint32, GUINT32_TO_BE, GUINT32_TO_LE)
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break;
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default:
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g_assert_not_reached ();
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}
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break;
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}
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case SINE_SRC_FLOAT:
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if (src->width == 32) {
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gfloat *p = (gfloat *) data;
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gfloat fval = (gfloat) value;
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for (j = 0; j < src->channels; j++) {
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*p = fval;
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p++;
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}
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data = p;
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break;
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}
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if (src->width == 64) {
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gdouble *p = (gdouble *) data;
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for (j = 0; j < src->channels; j++) {
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*p = value;
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p++;
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}
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data = p;
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break;
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}
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g_assert_not_reached ();
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default:
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g_assert_not_reached ();
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}
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}
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if (src->newcaps) {
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sinesrc_force_caps(src);
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}
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return buf;
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}
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GstElement *
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sinesrc_new (void)
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{
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return GST_ELEMENT (g_object_new (TYPE_SINESRC, NULL));
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}
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void
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sinesrc_set_pre_get_func (SineSrc *src, PreGetFunc func)
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{
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src->pre_get_func = func;
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}
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