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387 lines
11 KiB
C
387 lines
11 KiB
C
/* GStreamer
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* Copyright (C) 2010 David Schleef <ds@schleef.org>
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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 Library 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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:element-chopmydata
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* @title: gstchopmydata
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*
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* The chopmydata element takes an incoming stream and chops it up
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* into randomly sized buffers. Size of outgoing buffers are determined
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* by the max-size, min-size, and step-size properties.
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*
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* ## Example launch line
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* |[
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* gst-launch-1.0 -v audiotestsrc num-buffers=10 ! chopmydata min-size=100
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* max-size=200 step-size=2 ! fakesink -v
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* ]|
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*
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* This pipeline will create 10 buffers that are by default 2048 bytes
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* each (1024 samples each), and chop them up into buffers that range
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* in size from 100 bytes to 200 bytes, with the restriction that sizes
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* are a multiple of 2. This restriction is important, because the
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* default sample size for audiotestsrc is 2 bytes (one channel, 16-bit
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* audio).
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gst/gst.h>
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#include <gst/gst.h>
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#include "gstdebugutilsbadelements.h"
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#include "gstchopmydata.h"
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/* prototypes */
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static void gst_chop_my_data_set_property (GObject * object,
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guint property_id, const GValue * value, GParamSpec * pspec);
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static void gst_chop_my_data_get_property (GObject * object,
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guint property_id, GValue * value, GParamSpec * pspec);
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static GstStateChangeReturn
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gst_chop_my_data_change_state (GstElement * element, GstStateChange transition);
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static GstFlowReturn gst_chop_my_data_chain (GstPad * pad, GstObject * parent,
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GstBuffer * buffer);
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static gboolean gst_chop_my_data_sink_event (GstPad * pad, GstObject * parent,
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GstEvent * event);
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static gboolean gst_chop_my_data_src_event (GstPad * pad, GstObject * parent,
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GstEvent * event);
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#define DEFAULT_MAX_SIZE 4096
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#define DEFAULT_MIN_SIZE 1
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#define DEFAULT_STEP_SIZE 1
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enum
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{
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PROP_0,
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PROP_MAX_SIZE,
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PROP_MIN_SIZE,
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PROP_STEP_SIZE
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};
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/* pad templates */
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static GstStaticPadTemplate gst_chop_my_data_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS_ANY);
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static GstStaticPadTemplate gst_chop_my_data_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS_ANY);
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/* class initialization */
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#define gst_chop_my_data_parent_class parent_class
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G_DEFINE_TYPE (GstChopMyData, gst_chop_my_data, GST_TYPE_ELEMENT);
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GST_ELEMENT_REGISTER_DEFINE (chopmydata, "chopmydata",
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GST_RANK_NONE, gst_chop_my_data_get_type ());
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static void
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gst_chop_my_data_class_init (GstChopMyDataClass * klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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gobject_class->set_property = gst_chop_my_data_set_property;
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gobject_class->get_property = gst_chop_my_data_get_property;
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element_class->change_state =
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GST_DEBUG_FUNCPTR (gst_chop_my_data_change_state);
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g_object_class_install_property (gobject_class, PROP_MAX_SIZE,
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g_param_spec_int ("max-size", "max-size",
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"Maximum size of outgoing buffers", 1, G_MAXINT,
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DEFAULT_MAX_SIZE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_MIN_SIZE,
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g_param_spec_int ("min-size", "max-size",
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"Minimum size of outgoing buffers", 1, G_MAXINT,
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DEFAULT_MIN_SIZE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_STEP_SIZE,
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g_param_spec_int ("step-size", "step-size",
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"Step increment for random buffer sizes", 1, G_MAXINT,
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DEFAULT_MAX_SIZE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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gst_element_class_add_static_pad_template (element_class,
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&gst_chop_my_data_src_template);
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gst_element_class_add_static_pad_template (element_class,
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&gst_chop_my_data_sink_template);
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gst_element_class_set_static_metadata (element_class, "Chop my data",
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"Generic", "Split up a stream into randomly-sized buffers",
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"David Schleef <ds@schleef.org>");
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}
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static void
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gst_chop_my_data_init (GstChopMyData * chopmydata)
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{
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chopmydata->sinkpad =
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gst_pad_new_from_static_template (&gst_chop_my_data_sink_template,
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"sink");
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gst_pad_set_event_function (chopmydata->sinkpad,
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GST_DEBUG_FUNCPTR (gst_chop_my_data_sink_event));
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gst_pad_set_chain_function (chopmydata->sinkpad,
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GST_DEBUG_FUNCPTR (gst_chop_my_data_chain));
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GST_PAD_SET_PROXY_CAPS (chopmydata->sinkpad);
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gst_element_add_pad (GST_ELEMENT (chopmydata), chopmydata->sinkpad);
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chopmydata->srcpad =
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gst_pad_new_from_static_template (&gst_chop_my_data_src_template, "src");
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gst_pad_set_event_function (chopmydata->srcpad,
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GST_DEBUG_FUNCPTR (gst_chop_my_data_src_event));
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GST_PAD_SET_PROXY_CAPS (chopmydata->srcpad);
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gst_element_add_pad (GST_ELEMENT (chopmydata), chopmydata->srcpad);
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chopmydata->step_size = DEFAULT_STEP_SIZE;
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chopmydata->min_size = DEFAULT_MIN_SIZE;
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chopmydata->max_size = DEFAULT_MAX_SIZE;
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}
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void
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gst_chop_my_data_set_property (GObject * object, guint property_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstChopMyData *chopmydata;
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g_return_if_fail (GST_IS_CHOP_MY_DATA (object));
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chopmydata = GST_CHOP_MY_DATA (object);
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switch (property_id) {
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case PROP_MAX_SIZE:
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chopmydata->max_size = g_value_get_int (value);
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break;
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case PROP_MIN_SIZE:
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chopmydata->min_size = g_value_get_int (value);
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break;
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case PROP_STEP_SIZE:
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chopmydata->step_size = g_value_get_int (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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void
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gst_chop_my_data_get_property (GObject * object, guint property_id,
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GValue * value, GParamSpec * pspec)
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{
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GstChopMyData *chopmydata;
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g_return_if_fail (GST_IS_CHOP_MY_DATA (object));
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chopmydata = GST_CHOP_MY_DATA (object);
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switch (property_id) {
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case PROP_MAX_SIZE:
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g_value_set_int (value, chopmydata->max_size);
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break;
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case PROP_MIN_SIZE:
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g_value_set_int (value, chopmydata->min_size);
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break;
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case PROP_STEP_SIZE:
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g_value_set_int (value, chopmydata->step_size);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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static GstStateChangeReturn
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gst_chop_my_data_change_state (GstElement * element, GstStateChange transition)
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{
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GstChopMyData *chopmydata;
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GstStateChangeReturn ret;
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chopmydata = GST_CHOP_MY_DATA (element);
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switch (transition) {
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case GST_STATE_CHANGE_NULL_TO_READY:
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break;
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case GST_STATE_CHANGE_READY_TO_PAUSED:
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GST_OBJECT_LOCK (chopmydata);
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chopmydata->adapter = gst_adapter_new ();
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chopmydata->rand = g_rand_new ();
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chopmydata->next_size = 0;
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GST_OBJECT_UNLOCK (chopmydata);
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break;
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case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
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break;
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default:
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break;
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}
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ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
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switch (transition) {
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case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
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break;
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case GST_STATE_CHANGE_PAUSED_TO_READY:
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GST_OBJECT_LOCK (chopmydata);
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g_object_unref (chopmydata->adapter);
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chopmydata->adapter = NULL;
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g_rand_free (chopmydata->rand);
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GST_OBJECT_UNLOCK (chopmydata);
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break;
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case GST_STATE_CHANGE_READY_TO_NULL:
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break;
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default:
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break;
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}
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return ret;
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}
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static void
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get_next_size (GstChopMyData * chopmydata)
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{
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int begin;
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int end;
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begin = (chopmydata->min_size + chopmydata->step_size - 1) /
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chopmydata->step_size;
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end = (chopmydata->max_size + chopmydata->step_size) / chopmydata->step_size;
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if (begin >= end) {
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chopmydata->next_size = begin * chopmydata->step_size;
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return;
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}
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chopmydata->next_size =
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g_rand_int_range (chopmydata->rand, begin, end) * chopmydata->step_size;
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}
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static GstFlowReturn
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gst_chop_my_data_process (GstChopMyData * chopmydata, gboolean flush)
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{
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GstFlowReturn ret = GST_FLOW_OK;
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GstBuffer *buffer;
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if (chopmydata->next_size == 0) {
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get_next_size (chopmydata);
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}
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while (gst_adapter_available (chopmydata->adapter) >= chopmydata->next_size) {
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buffer =
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gst_adapter_take_buffer (chopmydata->adapter, chopmydata->next_size);
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GST_BUFFER_PTS (buffer) = gst_adapter_prev_pts (chopmydata->adapter, NULL);
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GST_BUFFER_DTS (buffer) = gst_adapter_prev_dts (chopmydata->adapter, NULL);
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chopmydata->next_size = 0;
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ret = gst_pad_push (chopmydata->srcpad, buffer);
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if (ret != GST_FLOW_OK) {
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return ret;
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}
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get_next_size (chopmydata);
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}
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if (flush) {
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guint min_size = chopmydata->min_size;
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while (gst_adapter_available (chopmydata->adapter) >= min_size) {
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buffer = gst_adapter_take_buffer (chopmydata->adapter, min_size);
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ret = gst_pad_push (chopmydata->srcpad, buffer);
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if (ret != GST_FLOW_OK)
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break;
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}
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gst_adapter_clear (chopmydata->adapter);
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}
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return ret;
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}
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static GstFlowReturn
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gst_chop_my_data_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
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{
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GstChopMyData *chopmydata;
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GstFlowReturn ret;
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chopmydata = GST_CHOP_MY_DATA (parent);
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GST_DEBUG_OBJECT (chopmydata, "chain");
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gst_adapter_push (chopmydata->adapter, buffer);
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ret = gst_chop_my_data_process (chopmydata, FALSE);
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return ret;
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}
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static gboolean
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gst_chop_my_data_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
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{
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gboolean res;
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GstChopMyData *chopmydata;
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chopmydata = GST_CHOP_MY_DATA (parent);
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GST_DEBUG_OBJECT (chopmydata, "event");
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_FLUSH_START:
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res = gst_pad_push_event (chopmydata->srcpad, event);
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break;
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case GST_EVENT_FLUSH_STOP:
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gst_adapter_clear (chopmydata->adapter);
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res = gst_pad_push_event (chopmydata->srcpad, event);
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break;
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case GST_EVENT_SEGMENT:
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res = gst_pad_push_event (chopmydata->srcpad, event);
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break;
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case GST_EVENT_EOS:
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gst_chop_my_data_process (chopmydata, TRUE);
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res = gst_pad_push_event (chopmydata->srcpad, event);
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break;
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default:
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res = gst_pad_push_event (chopmydata->srcpad, event);
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break;
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}
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return res;
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}
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static gboolean
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gst_chop_my_data_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
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{
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gboolean res;
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GstChopMyData *chopmydata;
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chopmydata = GST_CHOP_MY_DATA (parent);
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GST_DEBUG_OBJECT (chopmydata, "event");
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_SEEK:
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res = gst_pad_push_event (chopmydata->sinkpad, event);
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break;
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default:
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res = gst_pad_push_event (chopmydata->sinkpad, event);
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break;
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}
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return res;
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}
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