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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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1255 lines
37 KiB
C
1255 lines
37 KiB
C
/* GStreamer
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* Copyright (c) 2005 Edward Hervey <bilboed@bilboed.com>
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* Copyright (C) 2010 Sebastian Dröge <sebastian.droege@collabora.co.uk>
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* Copyright (C) 2020 Sebastian Dröge <sebastian@centricular.com>
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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-imagefreeze
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* @title: imagefreeze
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*
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* The imagefreeze element generates a still frame video stream from
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* the input. It duplicates the first frame with the framerate requested
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* by downstream, allows seeking and answers queries.
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*
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* ## Example launch line
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* |[
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* gst-launch-1.0 -v filesrc location=some.png ! decodebin ! videoconvert ! imagefreeze ! autovideosink
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* ]| This pipeline shows a still frame stream of a PNG file.
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*
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*/
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/* This is based on the imagefreeze element from PiTiVi:
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* http://git.gnome.org/browse/pitivi/tree/pitivi/elements/imagefreeze.py
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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/glib-compat-private.h>
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#include "gstimagefreeze.h"
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#define DEFAULT_NUM_BUFFERS -1
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#define DEFAULT_ALLOW_REPLACE FALSE
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#define DEFAULT_IS_LIVE FALSE
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enum
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{
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PROP_0,
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PROP_NUM_BUFFERS,
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PROP_ALLOW_REPLACE,
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PROP_IS_LIVE,
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};
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static void gst_image_freeze_finalize (GObject * object);
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static void gst_image_freeze_reset (GstImageFreeze * self);
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static GstStateChangeReturn gst_image_freeze_change_state (GstElement * element,
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GstStateChange transition);
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static GstClock *gst_image_freeze_provide_clock (GstElement * element);
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static void gst_image_freeze_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_image_freeze_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static GstFlowReturn gst_image_freeze_sink_chain (GstPad * pad,
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GstObject * parent, GstBuffer * buffer);
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static gboolean gst_image_freeze_sink_event (GstPad * pad, GstObject * parent,
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GstEvent * event);
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static gboolean gst_image_freeze_sink_setcaps (GstImageFreeze * self,
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GstCaps * caps);
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static GstCaps *gst_image_freeze_query_caps (GstImageFreeze * self,
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GstPad * pad, GstCaps * filter);
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static gboolean gst_image_freeze_sink_query (GstPad * pad, GstObject * parent,
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GstQuery * query);
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static void gst_image_freeze_src_loop (GstPad * pad);
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static gboolean gst_image_freeze_src_event (GstPad * pad, GstObject * parent,
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GstEvent * event);
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static gboolean gst_image_freeze_src_query (GstPad * pad, GstObject * parent,
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GstQuery * query);
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static GstStaticPadTemplate sink_pad_template = 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 ("video/x-raw(ANY); video/x-bayer(ANY)"));
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static GstStaticPadTemplate src_pad_template =
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GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("video/x-raw(ANY); video/x-bayer(ANY)"));
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GST_DEBUG_CATEGORY_STATIC (gst_image_freeze_debug);
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#define GST_CAT_DEFAULT gst_image_freeze_debug
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#define gst_image_freeze_parent_class parent_class
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G_DEFINE_TYPE (GstImageFreeze, gst_image_freeze, GST_TYPE_ELEMENT);
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GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (imagefreeze, "imagefreeze",
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GST_RANK_NONE, GST_TYPE_IMAGE_FREEZE,
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GST_DEBUG_CATEGORY_INIT (gst_image_freeze_debug, "imagefreeze", 0,
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"imagefreeze element");
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);
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static void
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gst_image_freeze_class_init (GstImageFreezeClass * klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
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gobject_class->finalize = gst_image_freeze_finalize;
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gobject_class->set_property = gst_image_freeze_set_property;
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gobject_class->get_property = gst_image_freeze_get_property;
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g_object_class_install_property (gobject_class, PROP_NUM_BUFFERS,
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g_param_spec_int ("num-buffers", "Number of buffers",
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"Number of buffers to output before sending EOS (-1 = unlimited)",
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-1, G_MAXINT, DEFAULT_NUM_BUFFERS, G_PARAM_READWRITE |
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G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_ALLOW_REPLACE,
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g_param_spec_boolean ("allow-replace", "Allow Replace",
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"Allow replacing the input buffer and always output the latest",
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DEFAULT_ALLOW_REPLACE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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/**
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* GstImageFreeze:is-live
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*
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* Selects whether the output stream should be a non-live stream based on
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* the segment configured via a %GST_EVENT_SEEK, or whether the output
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* stream should be a live stream with the negotiated framerate.
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*
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* Since: 1.18
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*/
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g_object_class_install_property (gobject_class, PROP_IS_LIVE,
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g_param_spec_boolean ("is-live", "Is Live",
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"Whether to output a live video stream",
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DEFAULT_IS_LIVE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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gstelement_class->change_state =
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GST_DEBUG_FUNCPTR (gst_image_freeze_change_state);
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gstelement_class->provide_clock =
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GST_DEBUG_FUNCPTR (gst_image_freeze_provide_clock);
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gst_element_class_set_static_metadata (gstelement_class,
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"Still frame stream generator",
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"Filter/Video",
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"Generates a still frame stream from an image",
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"Sebastian Dröge <sebastian.droege@collabora.co.uk>");
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gst_element_class_add_static_pad_template (gstelement_class,
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&sink_pad_template);
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gst_element_class_add_static_pad_template (gstelement_class,
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&src_pad_template);
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}
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static void
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gst_image_freeze_init (GstImageFreeze * self)
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{
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self->sinkpad = gst_pad_new_from_static_template (&sink_pad_template, "sink");
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gst_pad_set_chain_function (self->sinkpad,
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GST_DEBUG_FUNCPTR (gst_image_freeze_sink_chain));
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gst_pad_set_event_function (self->sinkpad,
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GST_DEBUG_FUNCPTR (gst_image_freeze_sink_event));
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gst_pad_set_query_function (self->sinkpad,
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GST_DEBUG_FUNCPTR (gst_image_freeze_sink_query));
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GST_PAD_SET_PROXY_ALLOCATION (self->sinkpad);
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gst_element_add_pad (GST_ELEMENT (self), self->sinkpad);
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self->srcpad = gst_pad_new_from_static_template (&src_pad_template, "src");
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gst_pad_set_event_function (self->srcpad,
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GST_DEBUG_FUNCPTR (gst_image_freeze_src_event));
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gst_pad_set_query_function (self->srcpad,
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GST_DEBUG_FUNCPTR (gst_image_freeze_src_query));
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gst_pad_use_fixed_caps (self->srcpad);
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gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
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g_mutex_init (&self->lock);
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g_cond_init (&self->blocked_cond);
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self->num_buffers = DEFAULT_NUM_BUFFERS;
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self->allow_replace = DEFAULT_ALLOW_REPLACE;
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self->is_live = DEFAULT_IS_LIVE;
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gst_image_freeze_reset (self);
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}
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static void
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gst_image_freeze_finalize (GObject * object)
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{
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GstImageFreeze *self = GST_IMAGE_FREEZE (object);
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self->num_buffers = DEFAULT_NUM_BUFFERS;
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gst_image_freeze_reset (self);
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g_mutex_clear (&self->lock);
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g_cond_clear (&self->blocked_cond);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static void
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gst_image_freeze_reset (GstImageFreeze * self)
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{
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GST_DEBUG_OBJECT (self, "Resetting internal state");
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g_mutex_lock (&self->lock);
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gst_buffer_replace (&self->buffer, NULL);
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gst_caps_replace (&self->buffer_caps, NULL);
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gst_caps_replace (&self->current_caps, NULL);
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self->num_buffers_left = self->num_buffers;
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gst_segment_init (&self->segment, GST_FORMAT_TIME);
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self->need_segment = TRUE;
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self->flushing = TRUE;
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self->negotiated_framerate = FALSE;
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self->fps_n = self->fps_d = 0;
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self->offset = 0;
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self->seqnum = 0;
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g_mutex_unlock (&self->lock);
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}
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static gboolean
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gst_image_freeze_sink_setcaps (GstImageFreeze * self, GstCaps * caps)
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{
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gboolean ret = FALSE;
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GstStructure *s;
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gint fps_n, fps_d;
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GstCaps *othercaps, *intersection, *pad_current_caps;
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guint i, n;
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GstPad *pad;
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pad = self->sinkpad;
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caps = gst_caps_copy (caps);
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/* If we already negotiated a framerate then only update for the
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* caps of the new buffer */
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if (self->negotiated_framerate) {
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gst_caps_set_simple (caps, "framerate", GST_TYPE_FRACTION, self->fps_n,
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self->fps_d, NULL);
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pad_current_caps = gst_pad_get_current_caps (self->srcpad);
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if (pad_current_caps && !gst_caps_is_equal (caps, pad_current_caps)) {
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GST_DEBUG_OBJECT (pad, "Setting caps %" GST_PTR_FORMAT, caps);
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gst_pad_set_caps (self->srcpad, caps);
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}
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gst_caps_unref (pad_current_caps);
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gst_caps_unref (caps);
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return TRUE;
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}
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/* Else negotiate a framerate with downstream */
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GST_DEBUG_OBJECT (pad, "Setting caps: %" GST_PTR_FORMAT, caps);
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s = gst_caps_get_structure (caps, 0);
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/* 1. Remove framerate */
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gst_structure_remove_field (s, "framerate");
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gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT, 1,
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NULL);
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/* 2. Intersect with template caps */
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othercaps = (GstCaps *) gst_pad_get_pad_template_caps (pad);
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intersection = gst_caps_intersect (caps, othercaps);
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GST_DEBUG_OBJECT (pad, "Intersecting: %" GST_PTR_FORMAT, caps);
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GST_DEBUG_OBJECT (pad, "with: %" GST_PTR_FORMAT, othercaps);
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GST_DEBUG_OBJECT (pad, "gave: %" GST_PTR_FORMAT, intersection);
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gst_caps_unref (caps);
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gst_caps_unref (othercaps);
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caps = intersection;
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intersection = othercaps = NULL;
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/* 3. Intersect with downstream peer caps */
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othercaps = gst_pad_peer_query_caps (self->srcpad, caps);
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GST_DEBUG_OBJECT (pad, "Peer query resulted: %" GST_PTR_FORMAT, othercaps);
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gst_caps_unref (caps);
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caps = othercaps;
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othercaps = NULL;
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/* 4. For every candidate try to use it downstream with framerate as
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* near as possible to 25/1 */
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n = gst_caps_get_size (caps);
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for (i = 0; i < n; i++) {
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GstCaps *candidate = gst_caps_new_empty ();
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GstStructure *s = gst_structure_copy (gst_caps_get_structure (caps, i));
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GstCapsFeatures *f =
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gst_caps_features_copy (gst_caps_get_features (caps, i));
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gst_caps_append_structure_full (candidate, s, f);
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if (gst_structure_has_field_typed (s, "framerate", GST_TYPE_FRACTION) ||
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gst_structure_fixate_field_nearest_fraction (s, "framerate", 25, 1)) {
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gst_structure_get_fraction (s, "framerate", &fps_n, &fps_d);
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if (fps_d != 0) {
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gst_pad_set_caps (self->srcpad, candidate);
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g_mutex_lock (&self->lock);
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self->fps_n = fps_n;
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self->fps_d = fps_d;
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g_mutex_unlock (&self->lock);
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self->negotiated_framerate = TRUE;
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GST_DEBUG_OBJECT (pad, "Setting caps %" GST_PTR_FORMAT, candidate);
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ret = TRUE;
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gst_caps_unref (candidate);
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break;
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} else {
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GST_WARNING_OBJECT (pad, "Invalid caps with framerate %d/%d", fps_n,
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fps_d);
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}
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}
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gst_caps_unref (candidate);
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}
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if (!ret)
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GST_ERROR_OBJECT (pad, "No usable caps found");
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gst_caps_unref (caps);
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return ret;
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}
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/* remove framerate in writable @caps */
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static void
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gst_image_freeze_remove_fps (GstImageFreeze * self, GstCaps * caps)
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{
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gint i, n;
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n = gst_caps_get_size (caps);
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for (i = 0; i < n; i++) {
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GstStructure *s = gst_caps_get_structure (caps, i);
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gst_structure_remove_field (s, "framerate");
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gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT,
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1, NULL);
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}
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}
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static GstCaps *
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gst_image_freeze_query_caps (GstImageFreeze * self, GstPad * pad,
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GstCaps * filter)
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{
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GstCaps *ret, *tmp, *templ;
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GstPad *otherpad;
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otherpad = (pad == self->srcpad) ? self->sinkpad : self->srcpad;
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if (filter) {
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filter = gst_caps_copy (filter);
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gst_image_freeze_remove_fps (self, filter);
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}
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templ = gst_pad_get_pad_template_caps (pad);
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tmp = gst_pad_peer_query_caps (otherpad, filter);
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if (tmp) {
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GST_LOG_OBJECT (otherpad, "peer caps %" GST_PTR_FORMAT, tmp);
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ret = gst_caps_intersect (tmp, templ);
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gst_caps_unref (tmp);
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} else {
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GST_LOG_OBJECT (otherpad, "going to copy");
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ret = gst_caps_copy (templ);
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}
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if (templ)
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gst_caps_unref (templ);
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if (filter)
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gst_caps_unref (filter);
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ret = gst_caps_make_writable (ret);
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gst_image_freeze_remove_fps (self, ret);
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GST_LOG_OBJECT (pad, "Returning caps: %" GST_PTR_FORMAT, ret);
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return ret;
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}
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static gboolean
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gst_image_freeze_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
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{
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GstImageFreeze *self = GST_IMAGE_FREEZE (parent);
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gboolean ret;
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GST_LOG_OBJECT (pad, "Handling query of type '%s'",
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gst_query_type_get_name (GST_QUERY_TYPE (query)));
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switch (GST_QUERY_TYPE (query)) {
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case GST_QUERY_CAPS:
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{
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GstCaps *caps;
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gst_query_parse_caps (query, &caps);
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caps = gst_image_freeze_query_caps (self, pad, caps);
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gst_query_set_caps_result (query, caps);
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gst_caps_unref (caps);
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ret = TRUE;
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break;
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}
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default:
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ret = gst_pad_query_default (pad, parent, query);
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}
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return ret;
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}
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static gboolean
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gst_image_freeze_convert (GstImageFreeze * self,
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GstFormat src_format, gint64 src_value,
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GstFormat * dest_format, gint64 * dest_value)
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{
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gboolean ret = FALSE;
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if (src_format == *dest_format) {
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*dest_value = src_value;
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return TRUE;
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}
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if (src_value == -1) {
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*dest_value = -1;
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return TRUE;
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}
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switch (src_format) {
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case GST_FORMAT_DEFAULT:{
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switch (*dest_format) {
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case GST_FORMAT_TIME:
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g_mutex_lock (&self->lock);
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if (self->fps_n == 0)
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*dest_value = -1;
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else
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*dest_value =
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gst_util_uint64_scale (src_value, GST_SECOND * self->fps_d,
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self->fps_n);
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g_mutex_unlock (&self->lock);
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ret = TRUE;
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break;
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default:
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break;
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}
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break;
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}
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case GST_FORMAT_TIME:{
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switch (*dest_format) {
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case GST_FORMAT_DEFAULT:
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g_mutex_lock (&self->lock);
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*dest_value =
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gst_util_uint64_scale (src_value, self->fps_n,
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self->fps_d * GST_SECOND);
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g_mutex_unlock (&self->lock);
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ret = TRUE;
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break;
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default:
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break;
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}
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break;
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|
}
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static gboolean
|
|
gst_image_freeze_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
|
|
{
|
|
GstImageFreeze *self = GST_IMAGE_FREEZE (parent);
|
|
gboolean ret = FALSE;
|
|
|
|
GST_LOG_OBJECT (pad, "Handling query of type '%s'",
|
|
gst_query_type_get_name (GST_QUERY_TYPE (query)));
|
|
|
|
switch (GST_QUERY_TYPE (query)) {
|
|
case GST_QUERY_CONVERT:{
|
|
GstFormat src_format, dest_format;
|
|
gint64 src_value, dest_value;
|
|
|
|
gst_query_parse_convert (query, &src_format, &src_value, &dest_format,
|
|
&dest_value);
|
|
ret =
|
|
gst_image_freeze_convert (self, src_format, src_value, &dest_format,
|
|
&dest_value);
|
|
if (ret)
|
|
gst_query_set_convert (query, src_format, src_value, dest_format,
|
|
dest_value);
|
|
break;
|
|
}
|
|
case GST_QUERY_POSITION:{
|
|
GstFormat format;
|
|
gint64 position;
|
|
|
|
gst_query_parse_position (query, &format, NULL);
|
|
switch (format) {
|
|
case GST_FORMAT_DEFAULT:{
|
|
g_mutex_lock (&self->lock);
|
|
position = self->offset;
|
|
g_mutex_unlock (&self->lock);
|
|
ret = TRUE;
|
|
break;
|
|
}
|
|
case GST_FORMAT_TIME:{
|
|
g_mutex_lock (&self->lock);
|
|
position = self->segment.position;
|
|
g_mutex_unlock (&self->lock);
|
|
ret = TRUE;
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (ret) {
|
|
gst_query_set_position (query, format, position);
|
|
GST_DEBUG_OBJECT (pad,
|
|
"Returning position %" G_GINT64_FORMAT " in format %s", position,
|
|
gst_format_get_name (format));
|
|
} else {
|
|
GST_DEBUG_OBJECT (pad, "Position query failed");
|
|
}
|
|
break;
|
|
}
|
|
case GST_QUERY_DURATION:{
|
|
GstFormat format;
|
|
gint64 duration;
|
|
|
|
gst_query_parse_duration (query, &format, NULL);
|
|
switch (format) {
|
|
case GST_FORMAT_TIME:{
|
|
g_mutex_lock (&self->lock);
|
|
duration = self->segment.stop;
|
|
g_mutex_unlock (&self->lock);
|
|
ret = TRUE;
|
|
break;
|
|
}
|
|
case GST_FORMAT_DEFAULT:{
|
|
g_mutex_lock (&self->lock);
|
|
duration = self->segment.stop;
|
|
if (duration != -1)
|
|
duration =
|
|
gst_util_uint64_scale (duration, self->fps_n,
|
|
GST_SECOND * self->fps_d);
|
|
g_mutex_unlock (&self->lock);
|
|
ret = TRUE;
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (ret) {
|
|
gst_query_set_duration (query, format, duration);
|
|
GST_DEBUG_OBJECT (pad,
|
|
"Returning duration %" G_GINT64_FORMAT " in format %s", duration,
|
|
gst_format_get_name (format));
|
|
} else {
|
|
GST_DEBUG_OBJECT (pad, "Duration query failed");
|
|
}
|
|
break;
|
|
}
|
|
case GST_QUERY_SEEKING:{
|
|
GstFormat format;
|
|
gboolean seekable;
|
|
|
|
gst_query_parse_seeking (query, &format, NULL, NULL, NULL);
|
|
seekable = !self->is_live && (format == GST_FORMAT_TIME
|
|
|| format == GST_FORMAT_DEFAULT);
|
|
|
|
gst_query_set_seeking (query, format, seekable, (seekable ? 0 : -1), -1);
|
|
ret = TRUE;
|
|
break;
|
|
}
|
|
case GST_QUERY_LATENCY:
|
|
if (self->is_live) {
|
|
/* If we run live, we output the buffer without any latency but allow
|
|
* for at most one frame of latency. If downstream takes longer to
|
|
* consume out frame we would skip ahead */
|
|
if (self->fps_n > 0 && self->fps_d > 0)
|
|
gst_query_set_latency (query, TRUE, 0,
|
|
gst_util_uint64_scale_ceil (GST_SECOND, self->fps_d,
|
|
self->fps_n));
|
|
else
|
|
gst_query_set_latency (query, TRUE, 0, GST_CLOCK_TIME_NONE);
|
|
} else {
|
|
/* If we don't run live, even if upstream is live, we never output any
|
|
* buffers with latency but immediately generate buffers as fast as we
|
|
* can according to the negotiated framerate */
|
|
gst_query_set_latency (query, FALSE, 0, GST_CLOCK_TIME_NONE);
|
|
}
|
|
ret = TRUE;
|
|
break;
|
|
case GST_QUERY_CAPS:
|
|
{
|
|
GstCaps *caps;
|
|
gst_query_parse_caps (query, &caps);
|
|
caps = gst_image_freeze_query_caps (self, pad, caps);
|
|
gst_query_set_caps_result (query, caps);
|
|
gst_caps_unref (caps);
|
|
ret = TRUE;
|
|
break;
|
|
}
|
|
default:
|
|
ret = gst_pad_query_default (pad, parent, query);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
static gboolean
|
|
gst_image_freeze_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
|
|
{
|
|
GstImageFreeze *self = GST_IMAGE_FREEZE (parent);
|
|
gboolean ret;
|
|
|
|
GST_LOG_OBJECT (pad, "Got %s event", GST_EVENT_TYPE_NAME (event));
|
|
|
|
switch (GST_EVENT_TYPE (event)) {
|
|
case GST_EVENT_CAPS:
|
|
{
|
|
GstCaps *caps;
|
|
|
|
g_mutex_lock (&self->lock);
|
|
gst_event_parse_caps (event, &caps);
|
|
gst_caps_replace (&self->current_caps, caps);
|
|
g_mutex_unlock (&self->lock);
|
|
gst_event_unref (event);
|
|
ret = TRUE;
|
|
break;
|
|
}
|
|
case GST_EVENT_EOS:
|
|
if (!self->buffer) {
|
|
/* if we receive EOS before a buffer arrives, then let it pass */
|
|
GST_DEBUG_OBJECT (self, "EOS without input buffer, passing on");
|
|
ret = gst_pad_push_event (self->srcpad, event);
|
|
break;
|
|
}
|
|
/* fall-through */
|
|
case GST_EVENT_SEGMENT:
|
|
GST_DEBUG_OBJECT (pad, "Dropping event");
|
|
gst_event_unref (event);
|
|
ret = TRUE;
|
|
break;
|
|
case GST_EVENT_FLUSH_START:
|
|
gst_image_freeze_reset (self);
|
|
/* fall through */
|
|
default:
|
|
ret = gst_pad_push_event (self->srcpad, gst_event_ref (event));
|
|
if (GST_EVENT_IS_STICKY (event))
|
|
ret = TRUE;
|
|
gst_event_unref (event);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static gboolean
|
|
gst_image_freeze_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
|
|
{
|
|
GstImageFreeze *self = GST_IMAGE_FREEZE (parent);
|
|
gboolean ret;
|
|
|
|
GST_LOG_OBJECT (pad, "Got %s event", GST_EVENT_TYPE_NAME (event));
|
|
|
|
switch (GST_EVENT_TYPE (event)) {
|
|
case GST_EVENT_NAVIGATION:
|
|
case GST_EVENT_QOS:
|
|
case GST_EVENT_LATENCY:
|
|
case GST_EVENT_STEP:
|
|
GST_DEBUG_OBJECT (pad, "Dropping event");
|
|
gst_event_unref (event);
|
|
ret = TRUE;
|
|
break;
|
|
case GST_EVENT_SEEK:{
|
|
gdouble rate;
|
|
GstFormat format;
|
|
GstSeekFlags flags;
|
|
GstSeekType start_type, stop_type;
|
|
gint64 start, stop;
|
|
gint64 last_stop;
|
|
gboolean start_task;
|
|
gboolean flush;
|
|
guint32 seqnum;
|
|
|
|
if (self->is_live) {
|
|
GST_ERROR_OBJECT (pad, "Can't seek in live mode");
|
|
ret = FALSE;
|
|
gst_event_unref (event);
|
|
break;
|
|
}
|
|
|
|
seqnum = gst_event_get_seqnum (event);
|
|
gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start,
|
|
&stop_type, &stop);
|
|
gst_event_unref (event);
|
|
|
|
flush = !!(flags & GST_SEEK_FLAG_FLUSH);
|
|
|
|
if (format != GST_FORMAT_TIME && format != GST_FORMAT_DEFAULT) {
|
|
GST_ERROR_OBJECT (pad, "Seek in invalid format: %s",
|
|
gst_format_get_name (format));
|
|
ret = FALSE;
|
|
break;
|
|
}
|
|
|
|
if (format == GST_FORMAT_DEFAULT) {
|
|
format = GST_FORMAT_TIME;
|
|
if (!gst_image_freeze_convert (self, GST_FORMAT_DEFAULT, start, &format,
|
|
&start)
|
|
|| !gst_image_freeze_convert (self, GST_FORMAT_DEFAULT, stop,
|
|
&format, &stop)
|
|
|| start == -1 || stop == -1) {
|
|
GST_ERROR_OBJECT (pad,
|
|
"Failed to convert seek from DEFAULT format into TIME format");
|
|
ret = FALSE;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (flush) {
|
|
GstEvent *e;
|
|
|
|
g_mutex_lock (&self->lock);
|
|
self->flushing = TRUE;
|
|
g_mutex_unlock (&self->lock);
|
|
|
|
e = gst_event_new_flush_start ();
|
|
gst_event_set_seqnum (e, seqnum);
|
|
gst_pad_push_event (self->srcpad, e);
|
|
} else {
|
|
gst_pad_pause_task (self->srcpad);
|
|
}
|
|
|
|
GST_PAD_STREAM_LOCK (self->srcpad);
|
|
|
|
g_mutex_lock (&self->lock);
|
|
|
|
gst_segment_do_seek (&self->segment, rate, format, flags, start_type,
|
|
start, stop_type, stop, NULL);
|
|
self->need_segment = TRUE;
|
|
last_stop = self->segment.position;
|
|
|
|
start_task = self->buffer != NULL;
|
|
self->flushing = FALSE;
|
|
g_mutex_unlock (&self->lock);
|
|
|
|
if (flush) {
|
|
GstEvent *e;
|
|
|
|
e = gst_event_new_flush_stop (TRUE);
|
|
gst_event_set_seqnum (e, seqnum);
|
|
gst_pad_push_event (self->srcpad, e);
|
|
}
|
|
|
|
if (flags & GST_SEEK_FLAG_SEGMENT) {
|
|
GstMessage *m;
|
|
|
|
m = gst_message_new_segment_start (GST_OBJECT (self),
|
|
format, last_stop);
|
|
gst_element_post_message (GST_ELEMENT (self), m);
|
|
}
|
|
|
|
self->seqnum = seqnum;
|
|
GST_PAD_STREAM_UNLOCK (self->srcpad);
|
|
|
|
GST_DEBUG_OBJECT (pad, "Seek successful");
|
|
|
|
if (start_task) {
|
|
g_mutex_lock (&self->lock);
|
|
|
|
if (self->buffer != NULL)
|
|
gst_pad_start_task (self->srcpad,
|
|
(GstTaskFunction) gst_image_freeze_src_loop, self->srcpad, NULL);
|
|
|
|
g_mutex_unlock (&self->lock);
|
|
}
|
|
|
|
ret = TRUE;
|
|
break;
|
|
}
|
|
case GST_EVENT_FLUSH_START:
|
|
g_mutex_lock (&self->lock);
|
|
self->flushing = TRUE;
|
|
g_mutex_unlock (&self->lock);
|
|
ret = gst_pad_push_event (self->sinkpad, event);
|
|
break;
|
|
case GST_EVENT_FLUSH_STOP:
|
|
gst_image_freeze_reset (self);
|
|
g_mutex_lock (&self->lock);
|
|
self->flushing = FALSE;
|
|
g_mutex_unlock (&self->lock);
|
|
ret = gst_pad_push_event (self->sinkpad, event);
|
|
break;
|
|
default:
|
|
ret = gst_pad_push_event (self->sinkpad, event);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
gst_image_freeze_set_property (GObject * object, guint prop_id,
|
|
const GValue * value, GParamSpec * pspec)
|
|
{
|
|
GstImageFreeze *self;
|
|
|
|
self = GST_IMAGE_FREEZE (object);
|
|
|
|
switch (prop_id) {
|
|
case PROP_NUM_BUFFERS:
|
|
self->num_buffers = g_value_get_int (value);
|
|
break;
|
|
case PROP_ALLOW_REPLACE:
|
|
self->allow_replace = g_value_get_boolean (value);
|
|
break;
|
|
case PROP_IS_LIVE:
|
|
self->is_live = g_value_get_boolean (value);
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_image_freeze_get_property (GObject * object, guint prop_id, GValue * value,
|
|
GParamSpec * pspec)
|
|
{
|
|
GstImageFreeze *self;
|
|
|
|
self = GST_IMAGE_FREEZE (object);
|
|
|
|
switch (prop_id) {
|
|
case PROP_NUM_BUFFERS:
|
|
g_value_set_int (value, self->num_buffers);
|
|
break;
|
|
case PROP_ALLOW_REPLACE:
|
|
g_value_set_boolean (value, self->allow_replace);
|
|
break;
|
|
case PROP_IS_LIVE:
|
|
g_value_set_boolean (value, self->is_live);
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_image_freeze_sink_chain (GstPad * pad, GstObject * parent,
|
|
GstBuffer * buffer)
|
|
{
|
|
GstImageFreeze *self = GST_IMAGE_FREEZE (parent);
|
|
GstFlowReturn flow_ret;
|
|
|
|
g_mutex_lock (&self->lock);
|
|
if (self->buffer && !self->allow_replace) {
|
|
GST_DEBUG_OBJECT (pad, "Already have a buffer, dropping");
|
|
gst_buffer_unref (buffer);
|
|
g_mutex_unlock (&self->lock);
|
|
return GST_FLOW_EOS;
|
|
}
|
|
|
|
if (!self->current_caps) {
|
|
GST_ERROR_OBJECT (pad, "Not negotiated yet");
|
|
g_mutex_unlock (&self->lock);
|
|
return GST_FLOW_NOT_NEGOTIATED;
|
|
}
|
|
|
|
gst_buffer_replace (&self->buffer, buffer);
|
|
if (!self->buffer_caps
|
|
|| !gst_caps_is_equal (self->buffer_caps, self->current_caps))
|
|
gst_pad_mark_reconfigure (self->srcpad);
|
|
gst_caps_replace (&self->buffer_caps, self->current_caps);
|
|
gst_buffer_unref (buffer);
|
|
|
|
gst_pad_start_task (self->srcpad, (GstTaskFunction) gst_image_freeze_src_loop,
|
|
self->srcpad, NULL);
|
|
flow_ret = self->allow_replace ? GST_FLOW_OK : GST_FLOW_EOS;
|
|
g_mutex_unlock (&self->lock);
|
|
return flow_ret;
|
|
}
|
|
|
|
static void
|
|
gst_image_freeze_src_loop (GstPad * pad)
|
|
{
|
|
GstImageFreeze *self = GST_IMAGE_FREEZE (GST_PAD_PARENT (pad));
|
|
GstBuffer *buffer;
|
|
guint64 offset;
|
|
GstClockTime timestamp, timestamp_end;
|
|
guint64 cstart, cstop;
|
|
gboolean in_seg, eos;
|
|
GstFlowReturn flow_ret = GST_FLOW_OK;
|
|
gboolean first = FALSE;
|
|
|
|
g_mutex_lock (&self->lock);
|
|
if (self->flushing) {
|
|
GST_DEBUG_OBJECT (pad, "Flushing");
|
|
flow_ret = GST_FLOW_FLUSHING;
|
|
g_mutex_unlock (&self->lock);
|
|
goto pause_task;
|
|
} else if (!self->buffer) {
|
|
GST_ERROR_OBJECT (pad, "Have no buffer yet");
|
|
flow_ret = GST_FLOW_ERROR;
|
|
g_mutex_unlock (&self->lock);
|
|
goto pause_task;
|
|
}
|
|
|
|
g_assert (self->buffer);
|
|
|
|
/* Take a new reference of the buffer here so we're guaranteed to have one
|
|
* in all the following code even if it disappears while we temporarily
|
|
* unlock the mutex */
|
|
buffer = gst_buffer_ref (self->buffer);
|
|
|
|
if (gst_pad_check_reconfigure (self->srcpad)) {
|
|
GstCaps *buffer_caps = gst_caps_ref (self->buffer_caps);
|
|
g_mutex_unlock (&self->lock);
|
|
if (!gst_image_freeze_sink_setcaps (self, buffer_caps)) {
|
|
gst_caps_unref (buffer_caps);
|
|
gst_buffer_unref (buffer);
|
|
gst_pad_mark_reconfigure (self->srcpad);
|
|
flow_ret = GST_FLOW_NOT_NEGOTIATED;
|
|
goto pause_task;
|
|
}
|
|
gst_caps_unref (buffer_caps);
|
|
g_mutex_lock (&self->lock);
|
|
}
|
|
|
|
/* normally we don't count buffers */
|
|
if (G_UNLIKELY (self->num_buffers_left >= 0)) {
|
|
GST_DEBUG_OBJECT (pad, "Buffers left %d", self->num_buffers_left);
|
|
if (self->num_buffers_left == 0) {
|
|
flow_ret = GST_FLOW_EOS;
|
|
gst_buffer_unref (buffer);
|
|
g_mutex_unlock (&self->lock);
|
|
goto pause_task;
|
|
} else {
|
|
self->num_buffers_left--;
|
|
}
|
|
}
|
|
buffer = gst_buffer_make_writable (buffer);
|
|
g_mutex_unlock (&self->lock);
|
|
|
|
if (self->need_segment) {
|
|
GstEvent *e;
|
|
|
|
GST_DEBUG_OBJECT (pad, "Pushing SEGMENT event: %" GST_SEGMENT_FORMAT,
|
|
&self->segment);
|
|
e = gst_event_new_segment (&self->segment);
|
|
|
|
if (self->seqnum)
|
|
gst_event_set_seqnum (e, self->seqnum);
|
|
|
|
g_mutex_lock (&self->lock);
|
|
if (self->segment.rate >= 0) {
|
|
self->offset =
|
|
gst_util_uint64_scale (self->segment.start, self->fps_n,
|
|
self->fps_d * GST_SECOND);
|
|
} else {
|
|
self->offset =
|
|
gst_util_uint64_scale (self->segment.stop, self->fps_n,
|
|
self->fps_d * GST_SECOND);
|
|
}
|
|
g_mutex_unlock (&self->lock);
|
|
|
|
self->need_segment = FALSE;
|
|
first = TRUE;
|
|
|
|
gst_pad_push_event (self->srcpad, e);
|
|
}
|
|
|
|
g_mutex_lock (&self->lock);
|
|
offset = self->offset;
|
|
if (self->is_live) {
|
|
GstClockTime base_time, clock_time;
|
|
GstClockTimeDiff jitter;
|
|
GstClockReturn clock_ret;
|
|
GstClock *clock;
|
|
|
|
clock = gst_element_get_clock (GST_ELEMENT (self));
|
|
|
|
/* Wait until the element went to PLAYING or flushing */
|
|
while ((!clock || self->blocked) && !self->flushing) {
|
|
g_cond_wait (&self->blocked_cond, &self->lock);
|
|
gst_clear_object (&clock);
|
|
clock = gst_element_get_clock (GST_ELEMENT (self));
|
|
}
|
|
|
|
if (self->flushing) {
|
|
g_mutex_unlock (&self->lock);
|
|
gst_buffer_unref (buffer);
|
|
flow_ret = GST_FLOW_FLUSHING;
|
|
gst_clear_object (&clock);
|
|
goto pause_task;
|
|
}
|
|
|
|
/* Wait on the clock until the time for our current frame is reached */
|
|
base_time = gst_element_get_base_time (GST_ELEMENT (self));
|
|
if (self->fps_n != 0) {
|
|
clock_time =
|
|
base_time + gst_util_uint64_scale (offset, self->fps_d * GST_SECOND,
|
|
self->fps_n);
|
|
} else {
|
|
clock_time = base_time;
|
|
}
|
|
|
|
self->clock_id = gst_clock_new_single_shot_id (clock, clock_time);
|
|
g_mutex_unlock (&self->lock);
|
|
GST_TRACE_OBJECT (self,
|
|
"Waiting for %" GST_TIME_FORMAT ", now %" GST_TIME_FORMAT,
|
|
GST_TIME_ARGS (clock_time), GST_TIME_ARGS (gst_clock_get_time (clock)));
|
|
clock_ret = gst_clock_id_wait (self->clock_id, &jitter);
|
|
GST_TRACE_OBJECT (self,
|
|
"Waited for %" GST_TIME_FORMAT ", clock ret %d, jitter %"
|
|
GST_STIME_FORMAT, GST_TIME_ARGS (clock_time), clock_ret,
|
|
GST_STIME_ARGS (jitter));
|
|
g_mutex_lock (&self->lock);
|
|
gst_clock_id_unref (self->clock_id);
|
|
self->clock_id = NULL;
|
|
gst_object_unref (clock);
|
|
|
|
if (self->flushing || clock_ret == GST_CLOCK_UNSCHEDULED) {
|
|
g_mutex_unlock (&self->lock);
|
|
gst_buffer_unref (buffer);
|
|
flow_ret = GST_FLOW_FLUSHING;
|
|
goto pause_task;
|
|
}
|
|
|
|
/* If we were late, adjust our offset and jump ahead if needed */
|
|
if (self->fps_n != 0) {
|
|
if (jitter > 0) {
|
|
guint64 new_offset =
|
|
gst_util_uint64_scale (clock_time + jitter - base_time, self->fps_n,
|
|
self->fps_d * GST_SECOND);
|
|
|
|
if (new_offset != offset) {
|
|
GST_INFO_OBJECT (self,
|
|
"Late by %" GST_TIME_FORMAT ", old offset %" G_GUINT64_FORMAT
|
|
", new offset %" G_GUINT64_FORMAT, GST_TIME_ARGS (jitter), offset,
|
|
new_offset);
|
|
self->offset = offset = new_offset;
|
|
}
|
|
}
|
|
|
|
timestamp =
|
|
gst_util_uint64_scale (offset, self->fps_d * GST_SECOND, self->fps_n);
|
|
timestamp_end =
|
|
gst_util_uint64_scale (offset + 1, self->fps_d * GST_SECOND,
|
|
self->fps_n);
|
|
} else {
|
|
/* If we have no framerate then we output a single frame now */
|
|
if (jitter > 0)
|
|
timestamp = jitter;
|
|
else
|
|
timestamp = 0;
|
|
|
|
timestamp_end = GST_CLOCK_TIME_NONE;
|
|
}
|
|
} else {
|
|
if (self->fps_n != 0) {
|
|
timestamp =
|
|
gst_util_uint64_scale (offset, self->fps_d * GST_SECOND, self->fps_n);
|
|
timestamp_end =
|
|
gst_util_uint64_scale (offset + 1, self->fps_d * GST_SECOND,
|
|
self->fps_n);
|
|
} else {
|
|
timestamp = self->segment.start;
|
|
timestamp_end = GST_CLOCK_TIME_NONE;
|
|
}
|
|
}
|
|
|
|
eos = (self->fps_n == 0 && offset > 0) ||
|
|
(self->segment.rate >= 0 && self->segment.stop != -1
|
|
&& timestamp > self->segment.stop) || (self->segment.rate < 0
|
|
&& offset == 0) || (self->segment.rate < 0
|
|
&& self->segment.start != -1 && timestamp_end < self->segment.start);
|
|
|
|
if (self->fps_n == 0 && offset > 0)
|
|
in_seg = FALSE;
|
|
else
|
|
in_seg =
|
|
gst_segment_clip (&self->segment, GST_FORMAT_TIME, timestamp,
|
|
timestamp_end, &cstart, &cstop);
|
|
|
|
if (in_seg) {
|
|
self->segment.position = cstart;
|
|
if (self->segment.rate >= 0)
|
|
self->segment.position = cstop;
|
|
}
|
|
|
|
if (self->segment.rate >= 0)
|
|
self->offset++;
|
|
else
|
|
self->offset--;
|
|
g_mutex_unlock (&self->lock);
|
|
|
|
GST_DEBUG_OBJECT (pad, "Handling buffer with timestamp %" GST_TIME_FORMAT,
|
|
GST_TIME_ARGS (timestamp));
|
|
|
|
if (in_seg) {
|
|
GST_BUFFER_DTS (buffer) = GST_CLOCK_TIME_NONE;
|
|
GST_BUFFER_PTS (buffer) = cstart;
|
|
GST_BUFFER_DURATION (buffer) = cstop - cstart;
|
|
GST_BUFFER_OFFSET (buffer) = offset;
|
|
GST_BUFFER_OFFSET_END (buffer) = offset + 1;
|
|
if (first)
|
|
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
|
|
else
|
|
GST_BUFFER_FLAG_UNSET (buffer, GST_BUFFER_FLAG_DISCONT);
|
|
flow_ret = gst_pad_push (self->srcpad, buffer);
|
|
GST_DEBUG_OBJECT (pad, "Pushing buffer resulted in %s",
|
|
gst_flow_get_name (flow_ret));
|
|
if (flow_ret != GST_FLOW_OK)
|
|
goto pause_task;
|
|
} else {
|
|
gst_buffer_unref (buffer);
|
|
}
|
|
|
|
if (eos) {
|
|
flow_ret = GST_FLOW_EOS;
|
|
goto pause_task;
|
|
}
|
|
|
|
return;
|
|
|
|
pause_task:
|
|
{
|
|
const gchar *reason = gst_flow_get_name (flow_ret);
|
|
|
|
GST_LOG_OBJECT (self, "pausing task, reason %s", reason);
|
|
gst_pad_pause_task (pad);
|
|
|
|
if (flow_ret == GST_FLOW_EOS) {
|
|
if ((self->segment.flags & GST_SEEK_FLAG_SEGMENT)) {
|
|
GstMessage *m;
|
|
GstEvent *e;
|
|
|
|
GST_DEBUG_OBJECT (pad, "Sending segment done at end of segment");
|
|
if (self->segment.rate >= 0) {
|
|
m = gst_message_new_segment_done (GST_OBJECT_CAST (self),
|
|
GST_FORMAT_TIME, self->segment.stop);
|
|
e = gst_event_new_segment_done (GST_FORMAT_TIME, self->segment.stop);
|
|
} else {
|
|
m = gst_message_new_segment_done (GST_OBJECT_CAST (self),
|
|
GST_FORMAT_TIME, self->segment.start);
|
|
e = gst_event_new_segment_done (GST_FORMAT_TIME, self->segment.start);
|
|
}
|
|
gst_element_post_message (GST_ELEMENT_CAST (self), m);
|
|
gst_pad_push_event (self->srcpad, e);
|
|
} else {
|
|
GstEvent *e = gst_event_new_eos ();
|
|
|
|
GST_DEBUG_OBJECT (pad, "Sending EOS at end of segment");
|
|
|
|
if (self->seqnum)
|
|
gst_event_set_seqnum (e, self->seqnum);
|
|
gst_pad_push_event (self->srcpad, e);
|
|
}
|
|
} else if (flow_ret == GST_FLOW_NOT_LINKED || flow_ret < GST_FLOW_EOS) {
|
|
GstEvent *e = gst_event_new_eos ();
|
|
|
|
GST_ELEMENT_FLOW_ERROR (self, flow_ret);
|
|
|
|
if (self->seqnum)
|
|
gst_event_set_seqnum (e, self->seqnum);
|
|
|
|
gst_pad_push_event (self->srcpad, e);
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
|
|
static GstStateChangeReturn
|
|
gst_image_freeze_change_state (GstElement * element, GstStateChange transition)
|
|
{
|
|
GstImageFreeze *self = GST_IMAGE_FREEZE (element);
|
|
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
|
|
gboolean no_preroll = FALSE;
|
|
|
|
switch (transition) {
|
|
case GST_STATE_CHANGE_READY_TO_PAUSED:
|
|
gst_image_freeze_reset (self);
|
|
g_mutex_lock (&self->lock);
|
|
self->flushing = FALSE;
|
|
self->blocked = TRUE;
|
|
g_mutex_unlock (&self->lock);
|
|
if (self->is_live)
|
|
no_preroll = TRUE;
|
|
break;
|
|
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
|
|
g_mutex_lock (&self->lock);
|
|
self->blocked = FALSE;
|
|
g_cond_signal (&self->blocked_cond);
|
|
g_mutex_unlock (&self->lock);
|
|
break;
|
|
case GST_STATE_CHANGE_PAUSED_TO_READY:
|
|
g_mutex_lock (&self->lock);
|
|
self->flushing = TRUE;
|
|
if (self->clock_id) {
|
|
GST_DEBUG_OBJECT (self, "unlock clock wait");
|
|
gst_clock_id_unschedule (self->clock_id);
|
|
}
|
|
self->blocked = FALSE;
|
|
g_cond_signal (&self->blocked_cond);
|
|
g_mutex_unlock (&self->lock);
|
|
gst_image_freeze_reset (self);
|
|
gst_pad_stop_task (self->srcpad);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (GST_ELEMENT_CLASS (parent_class)->change_state)
|
|
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
|
|
|
|
switch (transition) {
|
|
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
|
|
g_mutex_lock (&self->lock);
|
|
self->blocked = TRUE;
|
|
g_mutex_unlock (&self->lock);
|
|
if (self->is_live)
|
|
no_preroll = TRUE;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (no_preroll && ret == GST_STATE_CHANGE_SUCCESS)
|
|
ret = GST_STATE_CHANGE_NO_PREROLL;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* FIXME: GStreamer 2.0 */
|
|
static GstClock *
|
|
gst_image_freeze_provide_clock (GstElement * element)
|
|
{
|
|
return gst_system_clock_obtain ();
|
|
}
|
|
|
|
static gboolean
|
|
plugin_init (GstPlugin * plugin)
|
|
{
|
|
return GST_ELEMENT_REGISTER (imagefreeze, plugin);
|
|
}
|
|
|
|
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
|
|
GST_VERSION_MINOR,
|
|
imagefreeze,
|
|
"Still frame stream generator",
|
|
plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
|