gstreamer/gst/speed/gstspeed.c

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/* -*- c-basic-offset: 2 -*-
* GStreamer
* Copyright (C) 1999-2001 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.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <string.h>
#include <math.h>
#include <gst/gst.h>
#include <gst/audio/audio.h>
#include "gstspeed.h"
/* buffer size to make if no bufferpool is available, must be divisible by
* sizeof(gfloat) */
#define SPEED_BUFSIZE 4096
/* number of buffers to allocate per chunk in sink buffer pool */
#define SPEED_NUMBUF 6
/* elementfactory information */
static GstElementDetails speed_details = {
"Speed",
"Filter/Audio/Effect",
"LGPL",
"Set speed/pitch on audio/raw streams (resampler)",
VERSION,
"Andy Wingo <apwingo@eos.ncsu.edu>",
"(C) 2001"
};
/* Filter signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
ARG_SPEED
};
static GstPadTemplate*
speed_sink_factory (void)
{
static GstPadTemplate *template = NULL;
if (!template) {
template = gst_pad_template_new
("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
gst_caps_append(gst_caps_new ("sink_int", "audio/x-raw-int",
GST_AUDIO_INT_PAD_TEMPLATE_PROPS),
gst_caps_new ("sink_float", "audio/x-raw-float",
GST_AUDIO_FLOAT_STANDARD_PAD_TEMPLATE_PROPS)),
NULL);
}
return template;
}
static GstPadTemplate*
speed_src_factory (void)
{
static GstPadTemplate *template = NULL;
if (!template)
template = gst_pad_template_new
("src", GST_PAD_SRC, GST_PAD_ALWAYS,
gst_caps_append (gst_caps_new ("src_float", "audio/x-raw-float",
GST_AUDIO_FLOAT_STANDARD_PAD_TEMPLATE_PROPS),
gst_caps_new ("src_int", "audio/x-raw-int",
GST_AUDIO_INT_PAD_TEMPLATE_PROPS)),
NULL);
return template;
}
static GstBufferPool*
speed_sink_get_bufferpool (GstPad *pad)
{
GstSpeed *filter;
filter = GST_SPEED (gst_pad_get_parent(pad));
return filter->sinkpool;
}
static void speed_class_init (GstSpeedClass *klass);
static void speed_init (GstSpeed *filter);
static void speed_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
static void speed_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
static gboolean speed_parse_caps (GstSpeed *filter, GstCaps *caps);
static void speed_loop (GstElement *element);
static GstElementClass *parent_class = NULL;
/*static guint gst_filter_signals[LAST_SIGNAL] = { 0 }; */
static GstPadLinkReturn
speed_link (GstPad *pad, GstCaps *caps)
{
GstSpeed *filter;
GstPad *otherpad;
filter = GST_SPEED (gst_pad_get_parent (pad));
g_return_val_if_fail (filter != NULL, GST_PAD_LINK_REFUSED);
g_return_val_if_fail (GST_IS_SPEED (filter), GST_PAD_LINK_REFUSED);
otherpad = (pad == filter->srcpad ? filter->sinkpad : filter->srcpad);
if (GST_CAPS_IS_FIXED (caps)) {
if (! speed_parse_caps (filter, caps)) return GST_PAD_LINK_REFUSED;
return gst_pad_try_set_caps(otherpad, caps);
}
return GST_PAD_LINK_DELAYED;
}
static gboolean
speed_parse_caps (GstSpeed *filter, GstCaps *caps)
{
const gchar *mimetype;
g_return_val_if_fail(filter != NULL, FALSE);
g_return_val_if_fail(caps != NULL, FALSE);
gst_caps_get_int (caps, "rate", &filter->rate);
gst_caps_get_int (caps, "channels", &filter->channels);
gst_caps_get_int (caps, "width", &filter->width);
gst_caps_get_int (caps, "endianness", &filter->endianness);
gst_caps_get_int (caps, "buffer-frames", &filter->buffer_frames);
mimetype = gst_caps_get_mime (caps);
if (! strncmp(mimetype, "audio/x-raw-int", 15)) {
filter->format = GST_SPEED_FORMAT_INT;
gst_caps_get_int (caps, "depth", &filter->depth);
gst_caps_get_boolean (caps, "signed", &filter->is_signed);
} else if (! strncmp(mimetype, "audio/x-raw-float", 17)) {
filter->format = GST_SPEED_FORMAT_FLOAT;
} else {
return FALSE;
}
return TRUE;
}
GType
gst_speed_get_type(void) {
static GType speed_type = 0;
if (!speed_type) {
static const GTypeInfo speed_info = {
sizeof(GstSpeedClass), NULL,
NULL,
(GClassInitFunc)speed_class_init,
NULL,
NULL,
sizeof(GstSpeed),
0,
(GInstanceInitFunc)speed_init,
};
speed_type = g_type_register_static(GST_TYPE_ELEMENT, "GstSpeed", &speed_info, 0);
}
return speed_type;
}
static void
speed_class_init (GstSpeedClass *klass)
{
GObjectClass *gobject_class = (GObjectClass*)klass;
gobject_class->set_property = speed_set_property;
gobject_class->get_property = speed_get_property;
parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_SPEED,
g_param_spec_float("speed","speed","speed",
0.1,40.0,1.0,G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
}
static void
speed_init (GstSpeed *filter)
{
filter->sinkpad = gst_pad_new_from_template(speed_sink_factory (), "sink");
gst_pad_set_link_function(filter->sinkpad, speed_link);
gst_element_add_pad(GST_ELEMENT(filter),filter->sinkpad);
gst_pad_set_bufferpool_function (filter->sinkpad, speed_sink_get_bufferpool);
filter->srcpad = gst_pad_new_from_template(speed_src_factory (), "src");
gst_pad_set_link_function(filter->srcpad, speed_link);
gst_element_add_pad(GST_ELEMENT(filter),filter->srcpad);
gst_element_set_loop_function(GST_ELEMENT(filter),speed_loop);
filter->sinkpool = gst_buffer_pool_get_default(SPEED_BUFSIZE, SPEED_NUMBUF);
}
static void
speed_loop (GstElement *element)
{
GstSpeed *filter = GST_SPEED(element);
GstBuffer *in, *out;
guint i, j, nin, nout;
gfloat interp, speed, lower, i_float;
g_return_if_fail(filter != NULL);
g_return_if_fail(GST_IS_SPEED(filter));
filter->srcpool = gst_pad_get_bufferpool(filter->srcpad);
i = j = 0;
speed = filter->speed;
in = GST_BUFFER (gst_pad_pull(filter->sinkpad));
if (GST_IS_EVENT (in)) {
gst_pad_event_default (filter->sinkpad, GST_EVENT (in));
return;
}
while (GST_IS_EVENT (in)) {
gst_pad_event_default (filter->srcpad, GST_EVENT (in));
in = GST_BUFFER (gst_pad_pull (filter->sinkpad));
}
/* this is a bit nasty, but hey, it's what you've got to do to keep the same
* algorithm and multiple data types in c. */
if (filter->format==GST_SPEED_FORMAT_FLOAT) {
#define _FORMAT gfloat
#include "filter.func"
#undef _FORMAT
} else if (filter->format==GST_SPEED_FORMAT_INT && filter->width==16) {
#define _FORMAT gint16
#include "filter.func"
#undef _FORMAT
} else if (filter->format==GST_SPEED_FORMAT_INT && filter->width==8) {
#define _FORMAT gint8
#include "filter.func"
#undef _FORMAT
} else {
gst_element_error (element, "capsnego was never performed, bailing...");
gst_element_yield (element);
}
}
static void
speed_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
GstSpeed *filter;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail(GST_IS_SPEED(object));
filter = GST_SPEED(object);
switch (prop_id)
{
case ARG_SPEED:
filter->speed = g_value_get_float (value);
break;
default:
break;
}
}
static void
speed_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
GstSpeed *filter;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail(GST_IS_SPEED(object));
filter = GST_SPEED(object);
switch (prop_id) {
case ARG_SPEED:
g_value_set_float (value, filter->speed);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
plugin_init (GModule *module, GstPlugin *plugin)
{
GstElementFactory *factory;
factory = gst_element_factory_new("speed", GST_TYPE_SPEED, &speed_details);
g_return_val_if_fail(factory != NULL, FALSE);
gst_element_factory_add_pad_template (factory, speed_src_factory ());
gst_element_factory_add_pad_template (factory, speed_sink_factory ());
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
return TRUE;
}
GstPluginDesc plugin_desc = {
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"speed",
plugin_init
};