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/* GStreamer
* Copyright (C) 2010 David Schleef <ds@schleef.org>
*
* 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.
*/
/**
* SECTION:element-gstchopmydata
*
* The chopmydata element takes an incoming stream and chops it up
* into randomly sized buffers. Size of outgoing buffers are determined
* by the max-size, min-size, and step-size properties.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch -v audiotestsrc num-buffers=10 ! gstchopmydata min-size=100
* max-size=200 step-size=2 ! fakesink -v
* ]|
*
* This pipeline will create 10 buffers that are by default 2048 bytes
* each (1024 samples each), and chop them up into buffers that range
* in size from 100 bytes to 200 bytes, with the restriction that sizes
* are a multiple of 2. This restriction is important, because the
* default sample size for audiotestsrc is 2 bytes (one channel, 16-bit
* audio).
*
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/gst.h>
#include "gstchopmydata.h"
/* prototypes */
static void gst_chop_my_data_set_property (GObject * object,
guint property_id, const GValue * value, GParamSpec * pspec);
static void gst_chop_my_data_get_property (GObject * object,
guint property_id, GValue * value, GParamSpec * pspec);
static GstStateChangeReturn
gst_chop_my_data_change_state (GstElement * element, GstStateChange transition);
static GstFlowReturn gst_chop_my_data_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer);
static gboolean gst_chop_my_data_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_chop_my_data_src_event (GstPad * pad, GstObject * parent,
GstEvent * event);
#define DEFAULT_MAX_SIZE 4096
#define DEFAULT_MIN_SIZE 1
#define DEFAULT_STEP_SIZE 1
enum
{
PROP_0,
PROP_MAX_SIZE,
PROP_MIN_SIZE,
PROP_STEP_SIZE
};
/* pad templates */
static GstStaticPadTemplate gst_chop_my_data_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate gst_chop_my_data_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
/* class initialization */
#define gst_chop_my_data_parent_class parent_class
G_DEFINE_TYPE (GstChopMyData, gst_chop_my_data, GST_TYPE_ELEMENT);
static void
gst_chop_my_data_class_init (GstChopMyDataClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gobject_class->set_property = gst_chop_my_data_set_property;
gobject_class->get_property = gst_chop_my_data_get_property;
element_class->change_state =
GST_DEBUG_FUNCPTR (gst_chop_my_data_change_state);
g_object_class_install_property (gobject_class, PROP_MAX_SIZE,
g_param_spec_int ("max-size", "max-size",
"Maximum size of outgoing buffers", 1, G_MAXINT,
DEFAULT_MAX_SIZE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_MIN_SIZE,
g_param_spec_int ("min-size", "max-size",
"Minimum size of outgoing buffers", 1, G_MAXINT,
DEFAULT_MIN_SIZE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_STEP_SIZE,
g_param_spec_int ("step-size", "step-size",
"Step increment for random buffer sizes", 1, G_MAXINT,
DEFAULT_MAX_SIZE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_chop_my_data_src_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_chop_my_data_sink_template));
gst_element_class_set_details_simple (element_class, "FIXME",
"Generic", "FIXME", "David Schleef <ds@schleef.org>");
}
static void
gst_chop_my_data_init (GstChopMyData * chopmydata)
{
chopmydata->sinkpad =
gst_pad_new_from_static_template (&gst_chop_my_data_sink_template,
"sink");
gst_pad_set_event_function (chopmydata->sinkpad,
GST_DEBUG_FUNCPTR (gst_chop_my_data_sink_event));
gst_pad_set_chain_function (chopmydata->sinkpad,
GST_DEBUG_FUNCPTR (gst_chop_my_data_chain));
GST_PAD_SET_PROXY_CAPS (chopmydata->sinkpad);
gst_element_add_pad (GST_ELEMENT (chopmydata), chopmydata->sinkpad);
chopmydata->srcpad =
gst_pad_new_from_static_template (&gst_chop_my_data_src_template, "src");
gst_pad_set_event_function (chopmydata->srcpad,
GST_DEBUG_FUNCPTR (gst_chop_my_data_src_event));
GST_PAD_SET_PROXY_CAPS (chopmydata->srcpad);
gst_element_add_pad (GST_ELEMENT (chopmydata), chopmydata->srcpad);
chopmydata->step_size = DEFAULT_STEP_SIZE;
chopmydata->min_size = DEFAULT_MIN_SIZE;
chopmydata->max_size = DEFAULT_MAX_SIZE;
}
void
gst_chop_my_data_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
{
GstChopMyData *chopmydata;
g_return_if_fail (GST_IS_CHOP_MY_DATA (object));
chopmydata = GST_CHOP_MY_DATA (object);
switch (property_id) {
case PROP_MAX_SIZE:
chopmydata->max_size = g_value_get_int (value);
break;
case PROP_MIN_SIZE:
chopmydata->min_size = g_value_get_int (value);
break;
case PROP_STEP_SIZE:
chopmydata->step_size = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
void
gst_chop_my_data_get_property (GObject * object, guint property_id,
GValue * value, GParamSpec * pspec)
{
GstChopMyData *chopmydata;
g_return_if_fail (GST_IS_CHOP_MY_DATA (object));
chopmydata = GST_CHOP_MY_DATA (object);
switch (property_id) {
case PROP_MAX_SIZE:
g_value_set_int (value, chopmydata->max_size);
break;
case PROP_MIN_SIZE:
g_value_set_int (value, chopmydata->min_size);
break;
case PROP_STEP_SIZE:
g_value_set_int (value, chopmydata->step_size);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static GstStateChangeReturn
gst_chop_my_data_change_state (GstElement * element, GstStateChange transition)
{
GstChopMyData *chopmydata;
GstStateChangeReturn ret;
chopmydata = GST_CHOP_MY_DATA (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
GST_OBJECT_LOCK (chopmydata);
chopmydata->adapter = gst_adapter_new ();
chopmydata->rand = g_rand_new ();
chopmydata->next_size = 0;
GST_OBJECT_UNLOCK (chopmydata);
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
GST_OBJECT_LOCK (chopmydata);
g_object_unref (chopmydata->adapter);
chopmydata->adapter = NULL;
g_rand_free (chopmydata->rand);
GST_OBJECT_UNLOCK (chopmydata);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return ret;
}
static void
get_next_size (GstChopMyData * chopmydata)
{
int begin;
int end;
begin = (chopmydata->min_size + chopmydata->step_size - 1) /
chopmydata->step_size;
end = (chopmydata->max_size + chopmydata->step_size) / chopmydata->step_size;
if (begin >= end) {
chopmydata->next_size = begin * chopmydata->step_size;
return;
}
chopmydata->next_size =
g_rand_int_range (chopmydata->rand, begin, end) * chopmydata->step_size;
}
static GstFlowReturn
gst_chop_my_data_process (GstChopMyData * chopmydata, gboolean flush)
{
GstFlowReturn ret = GST_FLOW_OK;
GstBuffer *buffer;
if (chopmydata->next_size == 0) {
get_next_size (chopmydata);
}
while (gst_adapter_available (chopmydata->adapter) >= chopmydata->next_size) {
buffer =
gst_adapter_take_buffer (chopmydata->adapter, chopmydata->next_size);
chopmydata->next_size = 0;
ret = gst_pad_push (chopmydata->srcpad, buffer);
if (ret != GST_FLOW_OK) {
return ret;
}
get_next_size (chopmydata);
}
if (flush) {
guint min_size = chopmydata->min_size;
while (gst_adapter_available (chopmydata->adapter) >= min_size) {
buffer = gst_adapter_take_buffer (chopmydata->adapter, min_size);
ret = gst_pad_push (chopmydata->srcpad, buffer);
if (ret != GST_FLOW_OK)
break;
}
gst_adapter_clear (chopmydata->adapter);
}
return ret;
}
static GstFlowReturn
gst_chop_my_data_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
{
GstChopMyData *chopmydata;
GstFlowReturn ret;
chopmydata = GST_CHOP_MY_DATA (parent);
GST_DEBUG_OBJECT (chopmydata, "chain");
gst_adapter_push (chopmydata->adapter, buffer);
ret = gst_chop_my_data_process (chopmydata, FALSE);
return ret;
}
static gboolean
gst_chop_my_data_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
gboolean res;
GstChopMyData *chopmydata;
chopmydata = GST_CHOP_MY_DATA (parent);
GST_DEBUG_OBJECT (chopmydata, "event");
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
res = gst_pad_push_event (chopmydata->srcpad, event);
break;
case GST_EVENT_FLUSH_STOP:
gst_adapter_clear (chopmydata->adapter);
res = gst_pad_push_event (chopmydata->srcpad, event);
break;
case GST_EVENT_SEGMENT:
res = gst_pad_push_event (chopmydata->srcpad, event);
break;
case GST_EVENT_EOS:
gst_chop_my_data_process (chopmydata, TRUE);
res = gst_pad_push_event (chopmydata->srcpad, event);
break;
default:
res = gst_pad_push_event (chopmydata->srcpad, event);
break;
}
return res;
}
static gboolean
gst_chop_my_data_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
gboolean res;
GstChopMyData *chopmydata;
chopmydata = GST_CHOP_MY_DATA (parent);
GST_DEBUG_OBJECT (chopmydata, "event");
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:
res = gst_pad_push_event (chopmydata->sinkpad, event);
break;
default:
res = gst_pad_push_event (chopmydata->sinkpad, event);
break;
}
return res;
}