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393 lines
11 KiB
C
393 lines
11 KiB
C
/* gst-freeze -- Source freezer
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* Copyright (C) 2005 Gergely Nagy <gergely.nagy@neteyes.hu>
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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 Lesser General Public License
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* version 2.1, as published by the Free Software Foundation.
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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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/**
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* SECTION:element-freeze
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*
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* Makes a stream from buffers of data.
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*
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* <refsect2>
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* <title>Example launch line</title>
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* <para>
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* |[
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* gst-launch-0.10 filesrc location=gnome-home.png blocksize=4135 ! pngdec ! freeze ! ffmpegcolorspace ! xvimagesink
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* ]| Produces a video stream from one picture.
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* </para>
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* </refsect2>
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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 "gstfreeze.h"
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GST_DEBUG_CATEGORY_STATIC (freeze_debug);
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#define GST_CAT_DEFAULT freeze_debug
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enum
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{
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ARG_0,
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ARG_MAX_BUFFERS,
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};
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static GstStaticPadTemplate gst_freeze_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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static GstStaticPadTemplate gst_freeze_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 void gst_freeze_dispose (GObject * object);
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static void gst_freeze_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_freeze_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static GstFlowReturn gst_freeze_chain (GstPad * pad, GstBuffer * buffer);
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static GstStateChangeReturn gst_freeze_change_state (GstElement * element,
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GstStateChange transition);
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static GstFlowReturn gst_freeze_play (GstPad * pad, GstBuffer * buff);
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static void gst_freeze_loop (GstPad * pad);
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static gboolean gst_freeze_sink_activate (GstPad * sinkpad);
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static gboolean gst_freeze_sink_activate_pull (GstPad * sinkpad,
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gboolean active);
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static gboolean gst_freeze_sink_event (GstPad * pad, GstEvent * event);
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static void gst_freeze_clear_buffer (GstFreeze * freeze);
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static void gst_freeze_buffer_free (gpointer data, gpointer user_data);
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GST_BOILERPLATE (GstFreeze, gst_freeze, GstElement, GST_TYPE_ELEMENT);
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static void
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gst_freeze_base_init (gpointer klass)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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gst_element_class_set_details_simple (element_class, "Stream freezer",
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"Generic",
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"Makes a stream from buffers of data",
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"Gergely Nagy <gergely.nagy@neteyes.hu>,"
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" Renato Filho <renato.filho@indt.org.br>");
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_freeze_sink_template));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_freeze_src_template));
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}
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static void
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gst_freeze_class_init (GstFreezeClass * klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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element_class->change_state = gst_freeze_change_state;
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object_class->set_property = gst_freeze_set_property;
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object_class->get_property = gst_freeze_get_property;
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g_object_class_install_property (object_class,
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ARG_MAX_BUFFERS,
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g_param_spec_uint ("max-buffers",
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"max-buffers",
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"Maximum number of buffers", 0, G_MAXUINT, 1,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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object_class->dispose = gst_freeze_dispose;
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}
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static void
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gst_freeze_init (GstFreeze * freeze, GstFreezeClass * klass)
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{
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freeze->sinkpad =
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gst_pad_new_from_static_template (&gst_freeze_sink_template, "sink");
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gst_element_add_pad (GST_ELEMENT (freeze), freeze->sinkpad);
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gst_pad_set_activate_function (freeze->sinkpad, gst_freeze_sink_activate);
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gst_pad_set_activatepull_function (freeze->sinkpad,
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gst_freeze_sink_activate_pull);
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gst_pad_set_chain_function (freeze->sinkpad, gst_freeze_chain);
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gst_pad_set_getcaps_function (freeze->sinkpad, gst_pad_proxy_getcaps);
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gst_pad_set_event_function (freeze->sinkpad, gst_freeze_sink_event);
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freeze->srcpad =
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gst_pad_new_from_static_template (&gst_freeze_src_template, "src");
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gst_element_add_pad (GST_ELEMENT (freeze), freeze->srcpad);
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gst_pad_set_getcaps_function (freeze->srcpad, gst_pad_proxy_getcaps);
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freeze->timestamp_offset = 0;
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freeze->running_time = 0;
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freeze->current = NULL;
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freeze->max_buffers = 1;
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freeze->on_flush = FALSE;
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freeze->buffers = g_queue_new ();
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}
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static void
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gst_freeze_dispose (GObject * object)
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{
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GstFreeze *freeze = GST_FREEZE (object);
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gst_freeze_clear_buffer (freeze);
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g_queue_free (freeze->buffers);
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G_OBJECT_CLASS (parent_class)->dispose (object);
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}
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static void
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gst_freeze_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstFreeze *freeze = GST_FREEZE (object);
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switch (prop_id) {
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case ARG_MAX_BUFFERS:
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freeze->max_buffers = g_value_get_uint (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_freeze_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstFreeze *freeze = GST_FREEZE (object);
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switch (prop_id) {
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case ARG_MAX_BUFFERS:
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g_value_set_uint (value, freeze->max_buffers);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static GstFlowReturn
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gst_freeze_chain (GstPad * pad, GstBuffer * buffer)
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{
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return gst_freeze_play (pad, buffer);
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}
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static GstStateChangeReturn
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gst_freeze_change_state (GstElement * element, GstStateChange transition)
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{
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GstFreeze *freeze = GST_FREEZE (element);
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GstStateChangeReturn return_val = GST_STATE_CHANGE_SUCCESS;
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switch (transition) {
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case GST_STATE_CHANGE_READY_TO_PAUSED:
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break;
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case GST_STATE_CHANGE_NULL_TO_READY:
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case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
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freeze->timestamp_offset = freeze->running_time = 0;
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break;
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default:
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break;
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}
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if (GST_ELEMENT_CLASS (parent_class)->change_state)
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return_val =
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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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case GST_STATE_CHANGE_READY_TO_NULL:
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break;
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case GST_STATE_CHANGE_PAUSED_TO_READY:
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freeze->timestamp_offset = freeze->running_time = 0;
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break;
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default:
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break;
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}
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return return_val;
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}
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static GstFlowReturn
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gst_freeze_play (GstPad * pad, GstBuffer * buff)
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{
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GstFreeze *freeze;
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GstFlowReturn ret = GST_FLOW_OK;
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freeze = GST_FREEZE (gst_pad_get_parent (pad));
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if (freeze->on_flush) {
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g_object_unref (freeze);
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return GST_FLOW_FLUSHING;
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}
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/* If it is working in push mode this function will be called by "_chain"
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and buff will never be NULL. In pull mode this function will be called
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by _loop and buff will be NULL */
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if (!buff) {
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ret =
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gst_pad_pull_range (GST_PAD (freeze->sinkpad), freeze->offset, 4096,
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&buff);
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if (ret != GST_FLOW_OK) {
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gst_object_unref (freeze);
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return ret;
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}
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freeze->offset += GST_BUFFER_SIZE (buff);
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}
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if (g_queue_get_length (freeze->buffers) < freeze->max_buffers ||
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freeze->max_buffers == 0) {
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g_queue_push_tail (freeze->buffers, buff);
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GST_DEBUG_OBJECT (freeze, "accepted buffer %u",
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g_queue_get_length (freeze->buffers) - 1);
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} else {
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gst_buffer_unref (buff);
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}
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if (freeze->current != NULL) {
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GST_DEBUG_OBJECT (freeze, "switching to next buffer");
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freeze->current = g_queue_peek_nth (freeze->buffers,
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g_queue_index (freeze->buffers, (gpointer) freeze->current) + 1);
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}
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if (freeze->current == NULL) {
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if (freeze->max_buffers > 1)
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GST_DEBUG_OBJECT (freeze, "restarting the loop");
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freeze->current = g_queue_peek_head (freeze->buffers);
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}
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GST_BUFFER_TIMESTAMP (freeze->current) = freeze->timestamp_offset +
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freeze->running_time;
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freeze->running_time += GST_BUFFER_DURATION (freeze->current);
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gst_buffer_ref (freeze->current);
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ret = gst_pad_push (freeze->srcpad, freeze->current);
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gst_object_unref (freeze);
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return ret;
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}
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static void
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gst_freeze_loop (GstPad * pad)
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{
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gst_freeze_play (pad, NULL);
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}
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static gboolean
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gst_freeze_sink_activate (GstPad * sinkpad)
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{
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if (gst_pad_check_pull_range (sinkpad)) {
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return gst_pad_activate_pull (sinkpad, TRUE);
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} else {
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return gst_pad_activate_push (sinkpad, TRUE);
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}
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}
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static gboolean
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gst_freeze_sink_activate_pull (GstPad * sinkpad, gboolean active)
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{
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gboolean result;
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if (active) {
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/* if we have a scheduler we can start the task */
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result = gst_pad_start_task (sinkpad,
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(GstTaskFunction) gst_freeze_loop, sinkpad, NULL);
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} else {
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result = gst_pad_stop_task (sinkpad);
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}
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return result;
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}
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static void
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gst_freeze_buffer_free (gpointer data, gpointer user_data)
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{
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gst_buffer_unref (GST_BUFFER (data));
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}
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static void
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gst_freeze_clear_buffer (GstFreeze * freeze)
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{
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if (freeze->buffers != NULL) {
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g_queue_foreach (freeze->buffers, gst_freeze_buffer_free, NULL);
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}
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freeze->current = NULL;
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freeze->running_time = 0;
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}
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static gboolean
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gst_freeze_sink_event (GstPad * pad, GstEvent * event)
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{
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gboolean ret = TRUE;
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GstFreeze *freeze = GST_FREEZE (gst_pad_get_parent (pad));
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_EOS:
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GST_DEBUG_OBJECT (freeze, "EOS on sink pad %s",
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gst_pad_get_name (GST_PAD (freeze->sinkpad)));
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gst_event_unref (event);
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break;
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case GST_EVENT_NEWSEGMENT:
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/* FALL TROUGH */
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case GST_EVENT_FLUSH_STOP:
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gst_freeze_clear_buffer (freeze);
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/* FALL TROUGH */
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default:
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ret = gst_pad_event_default (GST_PAD (freeze->sinkpad), event);
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break;
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}
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gst_object_unref (freeze);
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return ret;
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}
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static gboolean
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plugin_init (GstPlugin * plugin)
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{
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GST_DEBUG_CATEGORY_INIT (freeze_debug, "freeze", 0, "Stream freezer");
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return gst_element_register (plugin, "freeze", GST_RANK_NONE,
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GST_TYPE_FREEZE);
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}
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GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
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GST_VERSION_MINOR,
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freeze,
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"Stream freezer",
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plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN);
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/*
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* Local variables:
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* mode: c
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* file-style: k&r
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* c-basic-offset: 2
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* arch-tag: fb0ee62b-cf74-46c0-8e62-93b58bacc0ed
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* End:
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*/
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