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Original commit message from CVS: * gst/base/gstbasesink.c: (gst_base_sink_pad_buffer_alloc): Add comment. * gst/elements/gstfakesink.c: (gst_fake_sink_init), (gst_fake_sink_change_state): Make state change function thread-safe. * gst/gstpad.c: (gst_pad_alloc_buffer): Set offset on generic buffer allocated by fallback.
1391 lines
39 KiB
C
1391 lines
39 KiB
C
/* GStreamer
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* Copyright (C) 2005 Wim Taymans <wim@fluendo.com>
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*
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* gstbasesink.c:
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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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:gstbasesink
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* @short_description: Base class for sink elements
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* @see_also: #GstBaseTransformc, #GstBaseSource
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*
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* This class is for elements that do output operations.
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*
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* <itemizedlist>
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* <listitem><para>one sinkpad</para></listitem>
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* <listitem><para>handles state changes</para></listitem>
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* <listitem><para>pull/push mode</para></listitem>
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* <listitem><para>handles seeking/query</para></listitem>
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* <listitem><para>handles preroll</para></listitem>
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* <listitem><para>EOS handling</para></listitem>
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* </itemizedlist>
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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 "gstbasesink.h"
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#include <gst/gstmarshal.h>
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GST_DEBUG_CATEGORY_STATIC (gst_base_sink_debug);
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#define GST_CAT_DEFAULT gst_base_sink_debug
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/* BaseSink signals and properties */
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enum
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{
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/* FILL ME */
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SIGNAL_HANDOFF,
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LAST_SIGNAL
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};
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#define DEFAULT_SIZE 1024
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#define DEFAULT_CAN_ACTIVATE_PULL FALSE /* fixme: enable me */
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#define DEFAULT_CAN_ACTIVATE_PUSH TRUE
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enum
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{
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PROP_0,
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PROP_PREROLL_QUEUE_LEN
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};
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static GstElementClass *parent_class = NULL;
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static void gst_base_sink_base_init (gpointer g_class);
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static void gst_base_sink_class_init (GstBaseSinkClass * klass);
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static void gst_base_sink_init (GstBaseSink * trans, gpointer g_class);
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static void gst_base_sink_finalize (GObject * object);
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GType
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gst_base_sink_get_type (void)
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{
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static GType base_sink_type = 0;
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if (!base_sink_type) {
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static const GTypeInfo base_sink_info = {
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sizeof (GstBaseSinkClass),
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(GBaseInitFunc) gst_base_sink_base_init,
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NULL,
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(GClassInitFunc) gst_base_sink_class_init,
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NULL,
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NULL,
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sizeof (GstBaseSink),
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0,
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(GInstanceInitFunc) gst_base_sink_init,
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};
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base_sink_type = g_type_register_static (GST_TYPE_ELEMENT,
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"GstBaseSink", &base_sink_info, G_TYPE_FLAG_ABSTRACT);
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}
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return base_sink_type;
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}
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static void gst_base_sink_set_clock (GstElement * element, GstClock * clock);
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static void gst_base_sink_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_base_sink_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static GstCaps *gst_base_sink_get_caps (GstBaseSink * sink);
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static gboolean gst_base_sink_set_caps (GstBaseSink * sink, GstCaps * caps);
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static GstFlowReturn gst_base_sink_buffer_alloc (GstBaseSink * sink,
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guint64 offset, guint size, GstCaps * caps, GstBuffer ** buf);
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static void gst_base_sink_get_times (GstBaseSink * basesink, GstBuffer * buffer,
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GstClockTime * start, GstClockTime * end);
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static GstStateChangeReturn gst_base_sink_change_state (GstElement * element,
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GstStateChange transition);
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static GstFlowReturn gst_base_sink_chain (GstPad * pad, GstBuffer * buffer);
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static void gst_base_sink_loop (GstPad * pad);
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static gboolean gst_base_sink_activate (GstPad * pad);
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static gboolean gst_base_sink_activate_push (GstPad * pad, gboolean active);
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static gboolean gst_base_sink_activate_pull (GstPad * pad, gboolean active);
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static gboolean gst_base_sink_event (GstPad * pad, GstEvent * event);
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static inline GstFlowReturn gst_base_sink_handle_buffer (GstBaseSink * basesink,
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GstBuffer * buf);
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static inline gboolean gst_base_sink_handle_event (GstBaseSink * basesink,
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GstEvent * event);
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static void
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gst_base_sink_base_init (gpointer g_class)
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{
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GST_DEBUG_CATEGORY_INIT (gst_base_sink_debug, "basesink", 0,
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"basesink element");
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}
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static void
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gst_base_sink_class_init (GstBaseSinkClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
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gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_sink_finalize);
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gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_base_sink_set_property);
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gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_base_sink_get_property);
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/* FIXME, this next value should be configured using an event from the
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* upstream element */
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g_object_class_install_property (G_OBJECT_CLASS (klass),
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PROP_PREROLL_QUEUE_LEN,
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g_param_spec_uint ("preroll-queue-len", "preroll-queue-len",
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"Number of buffers to queue during preroll", 0, G_MAXUINT, 0,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
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gstelement_class->set_clock = GST_DEBUG_FUNCPTR (gst_base_sink_set_clock);
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gstelement_class->change_state =
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GST_DEBUG_FUNCPTR (gst_base_sink_change_state);
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klass->get_caps = GST_DEBUG_FUNCPTR (gst_base_sink_get_caps);
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klass->set_caps = GST_DEBUG_FUNCPTR (gst_base_sink_set_caps);
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klass->buffer_alloc = GST_DEBUG_FUNCPTR (gst_base_sink_buffer_alloc);
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klass->get_times = GST_DEBUG_FUNCPTR (gst_base_sink_get_times);
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}
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static GstCaps *
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gst_base_sink_pad_getcaps (GstPad * pad)
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{
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GstBaseSinkClass *bclass;
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GstBaseSink *bsink;
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GstCaps *caps = NULL;
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bsink = GST_BASE_SINK (gst_pad_get_parent (pad));
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bclass = GST_BASE_SINK_GET_CLASS (bsink);
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if (bclass->get_caps)
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caps = bclass->get_caps (bsink);
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if (caps == NULL) {
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GstPadTemplate *pad_template;
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pad_template =
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gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
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if (pad_template != NULL) {
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caps = gst_caps_ref (gst_pad_template_get_caps (pad_template));
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}
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}
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gst_object_unref (bsink);
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return caps;
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}
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static gboolean
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gst_base_sink_pad_setcaps (GstPad * pad, GstCaps * caps)
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{
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GstBaseSinkClass *bclass;
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GstBaseSink *bsink;
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gboolean res = FALSE;
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bsink = GST_BASE_SINK (gst_pad_get_parent (pad));
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bclass = GST_BASE_SINK_GET_CLASS (bsink);
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if (bclass->set_caps)
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res = bclass->set_caps (bsink, caps);
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gst_object_unref (bsink);
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return res;
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}
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static GstFlowReturn
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gst_base_sink_pad_buffer_alloc (GstPad * pad, guint64 offset, guint size,
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GstCaps * caps, GstBuffer ** buf)
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{
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GstBaseSinkClass *bclass;
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GstBaseSink *bsink;
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GstFlowReturn result = GST_FLOW_OK;
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bsink = GST_BASE_SINK (gst_pad_get_parent (pad));
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bclass = GST_BASE_SINK_GET_CLASS (bsink);
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if (bclass->buffer_alloc)
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result = bclass->buffer_alloc (bsink, offset, size, caps, buf);
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else
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*buf = NULL; /* fallback in gstpad.c will allocate generic buffer */
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gst_object_unref (bsink);
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return result;
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}
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static void
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gst_base_sink_init (GstBaseSink * basesink, gpointer g_class)
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{
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GstPadTemplate *pad_template;
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pad_template =
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gst_element_class_get_pad_template (GST_ELEMENT_CLASS (g_class), "sink");
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g_return_if_fail (pad_template != NULL);
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basesink->sinkpad = gst_pad_new_from_template (pad_template, "sink");
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gst_pad_set_getcaps_function (basesink->sinkpad,
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GST_DEBUG_FUNCPTR (gst_base_sink_pad_getcaps));
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gst_pad_set_setcaps_function (basesink->sinkpad,
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GST_DEBUG_FUNCPTR (gst_base_sink_pad_setcaps));
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gst_pad_set_bufferalloc_function (basesink->sinkpad,
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GST_DEBUG_FUNCPTR (gst_base_sink_pad_buffer_alloc));
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gst_pad_set_activate_function (basesink->sinkpad,
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GST_DEBUG_FUNCPTR (gst_base_sink_activate));
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gst_pad_set_activatepush_function (basesink->sinkpad,
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GST_DEBUG_FUNCPTR (gst_base_sink_activate_push));
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gst_pad_set_activatepull_function (basesink->sinkpad,
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GST_DEBUG_FUNCPTR (gst_base_sink_activate_pull));
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gst_pad_set_event_function (basesink->sinkpad,
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GST_DEBUG_FUNCPTR (gst_base_sink_event));
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gst_pad_set_chain_function (basesink->sinkpad,
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GST_DEBUG_FUNCPTR (gst_base_sink_chain));
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gst_element_add_pad (GST_ELEMENT (basesink), basesink->sinkpad);
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basesink->pad_mode = GST_ACTIVATE_NONE;
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GST_PAD_TASK (basesink->sinkpad) = NULL;
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basesink->preroll_queue = g_queue_new ();
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basesink->can_activate_push = DEFAULT_CAN_ACTIVATE_PUSH;
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basesink->can_activate_pull = DEFAULT_CAN_ACTIVATE_PULL;
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GST_FLAG_SET (basesink, GST_ELEMENT_IS_SINK);
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}
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static void
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gst_base_sink_finalize (GObject * object)
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{
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GstBaseSink *basesink;
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basesink = GST_BASE_SINK (object);
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g_queue_free (basesink->preroll_queue);
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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_base_sink_set_clock (GstElement * element, GstClock * clock)
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{
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GstBaseSink *sink;
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sink = GST_BASE_SINK (element);
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sink->clock = clock;
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}
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static void
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gst_base_sink_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstBaseSink *sink = GST_BASE_SINK (object);
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switch (prop_id) {
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case PROP_PREROLL_QUEUE_LEN:
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/* preroll lock necessary to serialize with finish_preroll */
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GST_PREROLL_LOCK (sink->sinkpad);
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sink->preroll_queue_max_len = g_value_get_uint (value);
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GST_PREROLL_UNLOCK (sink->sinkpad);
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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_base_sink_get_property (GObject * object, guint prop_id, GValue * value,
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GParamSpec * pspec)
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{
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GstBaseSink *sink = GST_BASE_SINK (object);
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GST_LOCK (sink);
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switch (prop_id) {
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case PROP_PREROLL_QUEUE_LEN:
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g_value_set_uint (value, sink->preroll_queue_max_len);
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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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GST_UNLOCK (sink);
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}
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static GstCaps *
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gst_base_sink_get_caps (GstBaseSink * sink)
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{
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return NULL;
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}
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static gboolean
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gst_base_sink_set_caps (GstBaseSink * sink, GstCaps * caps)
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{
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return TRUE;
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}
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static GstFlowReturn
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gst_base_sink_buffer_alloc (GstBaseSink * sink, guint64 offset, guint size,
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GstCaps * caps, GstBuffer ** buf)
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{
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*buf = NULL;
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return GST_FLOW_OK;
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}
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/* with PREROLL_LOCK */
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static GstFlowReturn
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gst_base_sink_preroll_queue_empty (GstBaseSink * basesink, GstPad * pad)
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{
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GstMiniObject *obj;
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GQueue *q = basesink->preroll_queue;
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GstFlowReturn ret;
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ret = GST_FLOW_OK;
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if (q) {
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GST_DEBUG ("emptying queue");
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while ((obj = g_queue_pop_head (q))) {
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gboolean is_buffer;
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is_buffer = GST_IS_BUFFER (obj);
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if (is_buffer) {
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basesink->preroll_queued--;
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basesink->buffers_queued--;
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} else {
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switch (GST_EVENT_TYPE (obj)) {
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case GST_EVENT_EOS:
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basesink->preroll_queued--;
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break;
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default:
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break;
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}
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basesink->events_queued--;
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}
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/* we release the preroll lock while pushing so that we
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* can still flush it while blocking on the clock or
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* inside the element. */
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GST_PREROLL_UNLOCK (pad);
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if (is_buffer) {
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GST_DEBUG ("popped buffer %p", obj);
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ret = gst_base_sink_handle_buffer (basesink, GST_BUFFER (obj));
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} else {
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GST_DEBUG ("popped event %p", obj);
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gst_base_sink_handle_event (basesink, GST_EVENT (obj));
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ret = GST_FLOW_OK;
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}
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GST_PREROLL_LOCK (pad);
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}
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GST_DEBUG ("queue empty");
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}
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return ret;
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}
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/* with PREROLL_LOCK */
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static void
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gst_base_sink_preroll_queue_flush (GstBaseSink * basesink, GstPad * pad)
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{
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GstMiniObject *obj;
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GQueue *q = basesink->preroll_queue;
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GST_DEBUG ("flushing queue %p", basesink);
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if (q) {
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while ((obj = g_queue_pop_head (q))) {
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GST_DEBUG ("popped %p", obj);
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gst_mini_object_unref (obj);
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}
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}
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/* we can't have EOS anymore now */
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basesink->eos = FALSE;
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basesink->preroll_queued = 0;
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basesink->buffers_queued = 0;
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basesink->events_queued = 0;
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basesink->have_preroll = FALSE;
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/* and signal any waiters now */
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GST_PREROLL_SIGNAL (pad);
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}
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/* with STREAM_LOCK */
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static GstFlowReturn
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gst_base_sink_handle_object (GstBaseSink * basesink, GstPad * pad,
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GstMiniObject * obj)
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{
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gint length;
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gboolean have_event;
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GST_PREROLL_LOCK (pad);
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/* push object on the queue */
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GST_DEBUG_OBJECT (basesink, "push %p on preroll_queue", obj);
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g_queue_push_tail (basesink->preroll_queue, obj);
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have_event = GST_IS_EVENT (obj);
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if (have_event) {
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GstEvent *event = GST_EVENT (obj);
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switch (GST_EVENT_TYPE (obj)) {
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case GST_EVENT_EOS:
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basesink->preroll_queued++;
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basesink->eos = TRUE;
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break;
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case GST_EVENT_NEWSEGMENT:
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{
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GstFormat format;
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gint64 segment_start;
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gint64 segment_stop;
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/* the newsegment event is needed to bring the buffer timestamps to the
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* stream time and to drop samples outside of the playback segment. */
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gst_event_parse_newsegment (event, &basesink->segment_rate, &format,
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&segment_start, &segment_stop, &basesink->segment_base);
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basesink->have_newsegment = TRUE;
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if (format != GST_FORMAT_TIME) {
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GST_DEBUG_OBJECT (basesink,
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"received non time %d NEW_SEGMENT %" G_GINT64_FORMAT
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" -- %" G_GINT64_FORMAT ", base %" G_GINT64_FORMAT,
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format, basesink->segment_start, basesink->segment_stop,
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basesink->segment_base);
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/* this means this sink will not be able to clip or drop samples
|
|
* and timestamps have to start from 0. */
|
|
basesink->segment_start = -1;
|
|
basesink->segment_stop = -1;
|
|
basesink->segment_base = -1;
|
|
goto done_newsegment;
|
|
}
|
|
/* check if we really have a new segment or the previous one is
|
|
* closed */
|
|
if (basesink->segment_start != segment_start) {
|
|
/* the new segment has to be aligned with the old segment.
|
|
* We first update the accumulated time of the previous
|
|
* segment. the accumulated time is used when syncing to the
|
|
* clock. A flush event sets the accumulated time back to 0
|
|
*/
|
|
if (GST_CLOCK_TIME_IS_VALID (basesink->segment_stop)) {
|
|
basesink->segment_accum +=
|
|
basesink->segment_stop - basesink->segment_start;
|
|
} else if (GST_CLOCK_TIME_IS_VALID (basesink->current_end)) {
|
|
/* else use last seen timestamp as segment stop */
|
|
basesink->segment_accum +=
|
|
basesink->current_end - basesink->segment_start;
|
|
} else {
|
|
basesink->segment_accum = 0;
|
|
}
|
|
}
|
|
|
|
basesink->segment_start = segment_start;
|
|
basesink->segment_stop = segment_stop;
|
|
|
|
GST_DEBUG_OBJECT (basesink,
|
|
"received DISCONT %" GST_TIME_FORMAT " -- %"
|
|
GST_TIME_FORMAT ", base %" GST_TIME_FORMAT ", accum %"
|
|
GST_TIME_FORMAT,
|
|
GST_TIME_ARGS (basesink->segment_start),
|
|
GST_TIME_ARGS (basesink->segment_stop),
|
|
GST_TIME_ARGS (basesink->segment_base),
|
|
GST_TIME_ARGS (basesink->segment_accum));
|
|
done_newsegment:
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
basesink->events_queued++;
|
|
} else {
|
|
GstBuffer *buf = GST_BUFFER (obj);
|
|
|
|
if (!basesink->have_newsegment) {
|
|
GST_ELEMENT_WARNING (basesink, STREAM, STOPPED,
|
|
("Received buffer without a new-segment. Cannot sync to clock."),
|
|
("Received buffer without a new-segment. Cannot sync to clock."));
|
|
basesink->have_newsegment = TRUE;
|
|
/* this means this sink will not be able to sync to the clock */
|
|
basesink->segment_start = -1;
|
|
basesink->segment_stop = -1;
|
|
}
|
|
|
|
/* check if the buffer needs to be dropped */
|
|
if (TRUE) {
|
|
GstClockTime start = -1, end = -1;
|
|
|
|
/* we don't use the subclassed method as it may not return
|
|
* valid values for our purpose here */
|
|
gst_base_sink_get_times (basesink, buf, &start, &end);
|
|
|
|
GST_DEBUG_OBJECT (basesink, "got times start: %" GST_TIME_FORMAT
|
|
", end: %" GST_TIME_FORMAT, GST_TIME_ARGS (start),
|
|
GST_TIME_ARGS (end));
|
|
|
|
/* need to drop if the timestamp is not between segment_start and
|
|
* segment_stop. we check if the complete sample is outside of the
|
|
* range since the sink might be able to clip the sample. */
|
|
if (GST_CLOCK_TIME_IS_VALID (end) &&
|
|
GST_CLOCK_TIME_IS_VALID (basesink->segment_start)) {
|
|
if (end <= basesink->segment_start) {
|
|
GST_DEBUG ("buffer end %" GST_TIME_FORMAT " <= segment start %"
|
|
GST_TIME_FORMAT ", dropping buffer", GST_TIME_ARGS (end),
|
|
GST_TIME_ARGS (basesink->segment_start));
|
|
goto dropping;
|
|
}
|
|
}
|
|
if (GST_CLOCK_TIME_IS_VALID (start) &&
|
|
GST_CLOCK_TIME_IS_VALID (basesink->segment_stop)) {
|
|
if (basesink->segment_stop <= start) {
|
|
GST_DEBUG ("buffer start %" GST_TIME_FORMAT " >= segment stop %"
|
|
GST_TIME_FORMAT ", dropping buffer", GST_TIME_ARGS (start),
|
|
GST_TIME_ARGS (basesink->segment_stop));
|
|
goto dropping;
|
|
}
|
|
}
|
|
}
|
|
basesink->preroll_queued++;
|
|
basesink->buffers_queued++;
|
|
}
|
|
GST_DEBUG ("now %d preroll, %d buffers, %d events on queue",
|
|
basesink->preroll_queued,
|
|
basesink->buffers_queued, basesink->events_queued);
|
|
|
|
if (basesink->playing_async)
|
|
goto playing_async;
|
|
|
|
/* check if we are prerolling */
|
|
if (!basesink->need_preroll)
|
|
goto no_preroll;
|
|
|
|
/* there is a buffer queued */
|
|
if (basesink->buffers_queued == 1) {
|
|
GST_DEBUG ("do preroll %p", obj);
|
|
|
|
/* if it's a buffer, we need to call the preroll method */
|
|
if (GST_IS_BUFFER (obj)) {
|
|
GstBaseSinkClass *bclass;
|
|
GstFlowReturn pres;
|
|
|
|
bclass = GST_BASE_SINK_GET_CLASS (basesink);
|
|
if (bclass->preroll)
|
|
if ((pres =
|
|
bclass->preroll (basesink, GST_BUFFER (obj))) != GST_FLOW_OK)
|
|
goto preroll_failed;
|
|
}
|
|
}
|
|
length = basesink->preroll_queued;
|
|
GST_DEBUG ("prerolled length %d", length);
|
|
|
|
if (length == 1) {
|
|
gint t;
|
|
|
|
basesink->have_preroll = TRUE;
|
|
/* we are prerolling */
|
|
GST_PREROLL_UNLOCK (pad);
|
|
|
|
/* have to release STREAM_LOCK as we cannot take the STATE_LOCK
|
|
* inside the STREAM_LOCK */
|
|
t = GST_STREAM_UNLOCK_FULL (pad);
|
|
GST_DEBUG ("released stream lock %d times", t);
|
|
if (t <= 0) {
|
|
GST_WARNING ("STREAM_LOCK should have been locked !!");
|
|
g_warning ("STREAM_LOCK should have been locked !!");
|
|
}
|
|
|
|
/* now we commit our state */
|
|
GST_STATE_LOCK (basesink);
|
|
GST_DEBUG_OBJECT (basesink, "commit state");
|
|
gst_element_commit_state (GST_ELEMENT (basesink));
|
|
GST_STATE_UNLOCK (basesink);
|
|
|
|
/* reacquire stream lock, pad could be flushing now */
|
|
/* FIXME in glib, if t==0, the lock is still taken... hmmm */
|
|
if (t > 0)
|
|
GST_STREAM_LOCK_FULL (pad, t);
|
|
|
|
/* and wait if needed */
|
|
GST_PREROLL_LOCK (pad);
|
|
|
|
GST_LOCK (pad);
|
|
if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
|
|
goto flushing;
|
|
GST_UNLOCK (pad);
|
|
|
|
/* it is possible that the application set the state to PLAYING
|
|
* now in which case we don't need to block anymore. */
|
|
if (!basesink->need_preroll)
|
|
goto no_preroll;
|
|
|
|
length = basesink->preroll_queued;
|
|
|
|
g_assert (length == 1);
|
|
}
|
|
|
|
/* see if we need to block now. We cannot block on events, only
|
|
* on buffers, the reason is that events can be sent from the
|
|
* application thread and we don't want to block there. */
|
|
if (length > basesink->preroll_queue_max_len && !have_event) {
|
|
/* block until the state changes, or we get a flush, or something */
|
|
GST_DEBUG_OBJECT (basesink, "waiting to finish preroll");
|
|
GST_PREROLL_WAIT (pad);
|
|
GST_DEBUG_OBJECT (basesink, "done preroll");
|
|
}
|
|
GST_LOCK (pad);
|
|
if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
|
|
goto flushing;
|
|
GST_UNLOCK (pad);
|
|
|
|
GST_PREROLL_UNLOCK (pad);
|
|
|
|
return GST_FLOW_OK;
|
|
|
|
no_preroll:
|
|
{
|
|
GstFlowReturn ret;
|
|
|
|
GST_DEBUG ("no preroll needed");
|
|
/* maybe it was another sink that blocked in preroll, need to check for
|
|
buffers to drain */
|
|
basesink->have_preroll = FALSE;
|
|
ret = gst_base_sink_preroll_queue_empty (basesink, pad);
|
|
GST_PREROLL_UNLOCK (pad);
|
|
|
|
return ret;
|
|
}
|
|
dropping:
|
|
{
|
|
GstBuffer *buf;
|
|
|
|
buf = GST_BUFFER (g_queue_pop_tail (basesink->preroll_queue));
|
|
|
|
gst_buffer_unref (buf);
|
|
GST_PREROLL_UNLOCK (pad);
|
|
|
|
return GST_FLOW_OK;
|
|
}
|
|
playing_async:
|
|
{
|
|
GstFlowReturn ret;
|
|
gint t;
|
|
|
|
basesink->have_preroll = FALSE;
|
|
basesink->playing_async = FALSE;
|
|
|
|
/* handle buffer first */
|
|
ret = gst_base_sink_preroll_queue_empty (basesink, pad);
|
|
|
|
/* unroll locks, commit state, reacquire stream lock */
|
|
GST_PREROLL_UNLOCK (pad);
|
|
t = GST_STREAM_UNLOCK_FULL (pad);
|
|
GST_DEBUG ("released stream lock %d times", t);
|
|
if (t <= 0) {
|
|
GST_WARNING ("STREAM_LOCK should have been locked !!");
|
|
g_warning ("STREAM_LOCK should have been locked !!");
|
|
}
|
|
GST_STATE_LOCK (basesink);
|
|
GST_DEBUG_OBJECT (basesink, "commit state");
|
|
gst_element_commit_state (GST_ELEMENT (basesink));
|
|
GST_STATE_UNLOCK (basesink);
|
|
if (t > 0)
|
|
GST_STREAM_LOCK_FULL (pad, t);
|
|
|
|
return ret;
|
|
}
|
|
flushing:
|
|
{
|
|
GST_UNLOCK (pad);
|
|
gst_base_sink_preroll_queue_flush (basesink, pad);
|
|
GST_PREROLL_UNLOCK (pad);
|
|
GST_DEBUG ("pad is flushing");
|
|
return GST_FLOW_WRONG_STATE;
|
|
}
|
|
preroll_failed:
|
|
{
|
|
gint t;
|
|
|
|
GST_DEBUG ("preroll failed");
|
|
gst_base_sink_preroll_queue_flush (basesink, pad);
|
|
GST_PREROLL_UNLOCK (pad);
|
|
|
|
/* have to release STREAM_LOCK as we cannot take the STATE_LOCK
|
|
* inside the STREAM_LOCK */
|
|
t = GST_STREAM_UNLOCK_FULL (pad);
|
|
GST_DEBUG ("released stream lock %d times", t);
|
|
if (t <= 0) {
|
|
GST_WARNING ("STREAM_LOCK should have been locked !!");
|
|
g_warning ("STREAM_LOCK should have been locked !!");
|
|
}
|
|
|
|
/* now we abort our state */
|
|
GST_STATE_LOCK (basesink);
|
|
GST_DEBUG_OBJECT (basesink, "abort state");
|
|
gst_element_abort_state (GST_ELEMENT (basesink));
|
|
GST_STATE_UNLOCK (basesink);
|
|
|
|
/* reacquire stream lock, pad could be flushing now */
|
|
if (t > 0)
|
|
GST_STREAM_LOCK_FULL (pad, t);
|
|
|
|
return GST_FLOW_ERROR;
|
|
}
|
|
}
|
|
|
|
static gboolean
|
|
gst_base_sink_event (GstPad * pad, GstEvent * event)
|
|
{
|
|
GstBaseSink *basesink;
|
|
gboolean result = TRUE;
|
|
GstBaseSinkClass *bclass;
|
|
|
|
basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
|
|
|
|
bclass = GST_BASE_SINK_GET_CLASS (basesink);
|
|
|
|
GST_DEBUG ("event %p", event);
|
|
|
|
switch (GST_EVENT_TYPE (event)) {
|
|
case GST_EVENT_EOS:
|
|
{
|
|
GstFlowReturn ret;
|
|
|
|
GST_STREAM_LOCK (pad);
|
|
/* EOS also finishes the preroll */
|
|
ret =
|
|
gst_base_sink_handle_object (basesink, pad, GST_MINI_OBJECT (event));
|
|
GST_STREAM_UNLOCK (pad);
|
|
break;
|
|
}
|
|
case GST_EVENT_NEWSEGMENT:
|
|
{
|
|
GstFlowReturn ret;
|
|
|
|
GST_STREAM_LOCK (pad);
|
|
ret =
|
|
gst_base_sink_handle_object (basesink, pad, GST_MINI_OBJECT (event));
|
|
GST_STREAM_UNLOCK (pad);
|
|
break;
|
|
}
|
|
case GST_EVENT_FLUSH_START:
|
|
/* make sure we are not blocked on the clock also clear any pending
|
|
* eos state. */
|
|
if (bclass->event)
|
|
bclass->event (basesink, event);
|
|
|
|
GST_PREROLL_LOCK (pad);
|
|
/* we need preroll after the flush */
|
|
basesink->need_preroll = TRUE;
|
|
/* unlock from a possible state change/preroll */
|
|
gst_base_sink_preroll_queue_flush (basesink, pad);
|
|
|
|
GST_LOCK (basesink);
|
|
if (basesink->clock_id) {
|
|
gst_clock_id_unschedule (basesink->clock_id);
|
|
}
|
|
GST_UNLOCK (basesink);
|
|
GST_PREROLL_UNLOCK (pad);
|
|
|
|
/* and we need to commit our state again on the next
|
|
* prerolled buffer */
|
|
GST_STATE_LOCK (basesink);
|
|
GST_STREAM_LOCK (pad);
|
|
gst_element_lost_state (GST_ELEMENT (basesink));
|
|
GST_STREAM_UNLOCK (pad);
|
|
GST_STATE_UNLOCK (basesink);
|
|
GST_DEBUG ("event unref %p %p", basesink, event);
|
|
gst_event_unref (event);
|
|
break;
|
|
case GST_EVENT_FLUSH_STOP:
|
|
if (bclass->event)
|
|
bclass->event (basesink, event);
|
|
|
|
/* now we are completely unblocked and the _chain method
|
|
* will return */
|
|
GST_STREAM_LOCK (pad);
|
|
/* we need new segment info after the flush. */
|
|
basesink->segment_start = -1;
|
|
basesink->segment_stop = -1;
|
|
basesink->current_start = -1;
|
|
basesink->current_end = -1;
|
|
GST_DEBUG ("reset accum %" GST_TIME_FORMAT,
|
|
GST_TIME_ARGS (basesink->segment_accum));
|
|
basesink->segment_accum = 0;
|
|
GST_STREAM_UNLOCK (pad);
|
|
|
|
GST_DEBUG ("event unref %p %p", basesink, event);
|
|
gst_event_unref (event);
|
|
break;
|
|
default:
|
|
gst_event_unref (event);
|
|
break;
|
|
}
|
|
gst_object_unref (basesink);
|
|
|
|
return result;
|
|
}
|
|
|
|
/* default implementation to calculate the start and end
|
|
* timestamps on a buffer, subclasses can override
|
|
*/
|
|
static void
|
|
gst_base_sink_get_times (GstBaseSink * basesink, GstBuffer * buffer,
|
|
GstClockTime * start, GstClockTime * end)
|
|
{
|
|
GstClockTime timestamp, duration;
|
|
|
|
timestamp = GST_BUFFER_TIMESTAMP (buffer);
|
|
if (GST_CLOCK_TIME_IS_VALID (timestamp)) {
|
|
|
|
/* get duration to calculate end time */
|
|
duration = GST_BUFFER_DURATION (buffer);
|
|
if (GST_CLOCK_TIME_IS_VALID (duration)) {
|
|
*end = timestamp + duration;
|
|
}
|
|
*start = timestamp;
|
|
}
|
|
}
|
|
|
|
/* perform synchronisation on a buffer
|
|
*
|
|
* 1) check if we have a clock, if not, do nothing
|
|
* 2) calculate the start and end time of the buffer
|
|
* 3) create a single shot notification to wait on
|
|
* the clock, save the entry so we can unlock it
|
|
* 4) wait on the clock, this blocks
|
|
* 5) unref the clockid again
|
|
*/
|
|
static gboolean
|
|
gst_base_sink_do_sync (GstBaseSink * basesink, GstBuffer * buffer)
|
|
{
|
|
gboolean result = TRUE;
|
|
GstClockTime start, end;
|
|
GstClockTimeDiff stream_start, stream_end;
|
|
GstBaseSinkClass *bclass;
|
|
gboolean start_valid, end_valid;
|
|
|
|
bclass = GST_BASE_SINK_GET_CLASS (basesink);
|
|
|
|
start = end = -1;
|
|
if (bclass->get_times)
|
|
bclass->get_times (basesink, buffer, &start, &end);
|
|
|
|
start_valid = GST_CLOCK_TIME_IS_VALID (start);
|
|
end_valid = GST_CLOCK_TIME_IS_VALID (start);
|
|
|
|
GST_DEBUG_OBJECT (basesink, "got times start: %" GST_TIME_FORMAT
|
|
", end: %" GST_TIME_FORMAT, GST_TIME_ARGS (start), GST_TIME_ARGS (end));
|
|
|
|
/* if we don't have a timestamp, we don't sync */
|
|
if (!start_valid)
|
|
goto done;
|
|
|
|
/* save last times seen. */
|
|
basesink->current_start = start;
|
|
if (end_valid)
|
|
basesink->current_end = end;
|
|
else
|
|
basesink->current_end = start;
|
|
|
|
if (GST_CLOCK_TIME_IS_VALID (basesink->segment_stop)) {
|
|
/* check if not outside of the segment range, start is
|
|
* always valid here. */
|
|
if (start > basesink->segment_stop)
|
|
goto out_of_segment;
|
|
}
|
|
|
|
/* bring timestamp to stream time using last segment offset. */
|
|
if (GST_CLOCK_TIME_IS_VALID (basesink->segment_start)) {
|
|
/* check if not outside of the segment range */
|
|
if (end_valid && end < basesink->segment_start)
|
|
goto out_of_segment;
|
|
|
|
stream_start = (gint64) start - basesink->segment_start;
|
|
stream_end = (gint64) end - basesink->segment_start;
|
|
} else {
|
|
stream_start = (gint64) start;
|
|
stream_end = (gint64) end;
|
|
}
|
|
|
|
stream_start += basesink->segment_accum;
|
|
if (end_valid)
|
|
stream_end += basesink->segment_accum;
|
|
|
|
/* now do clocking */
|
|
if (basesink->clock) {
|
|
GstClockReturn ret;
|
|
GstClockTime base_time;
|
|
|
|
GST_LOCK (basesink);
|
|
base_time = GST_ELEMENT (basesink)->base_time;
|
|
|
|
GST_LOG_OBJECT (basesink,
|
|
"waiting for clock, base time %" GST_TIME_FORMAT,
|
|
GST_TIME_ARGS (base_time));
|
|
|
|
/* save clock id so that we can unlock it if needed */
|
|
basesink->clock_id = gst_clock_new_single_shot_id (basesink->clock,
|
|
stream_start + base_time);
|
|
/* also save end_time of this buffer so that we can wait
|
|
* to signal EOS */
|
|
if (end_valid)
|
|
basesink->end_time = stream_end + base_time;
|
|
else
|
|
basesink->end_time = GST_CLOCK_TIME_NONE;
|
|
GST_UNLOCK (basesink);
|
|
|
|
ret = gst_clock_id_wait (basesink->clock_id, NULL);
|
|
|
|
GST_LOCK (basesink);
|
|
if (basesink->clock_id) {
|
|
gst_clock_id_unref (basesink->clock_id);
|
|
basesink->clock_id = NULL;
|
|
}
|
|
GST_UNLOCK (basesink);
|
|
|
|
GST_LOG_OBJECT (basesink, "clock entry done: %d", ret);
|
|
if (ret == GST_CLOCK_UNSCHEDULED)
|
|
result = FALSE;
|
|
}
|
|
|
|
done:
|
|
return result;
|
|
|
|
out_of_segment:
|
|
{
|
|
GST_LOG_OBJECT (basesink, "buffer skipped, not in segment");
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
|
|
/* handle an event
|
|
*
|
|
* 2) render the event
|
|
* 3) unref the event
|
|
*/
|
|
static inline gboolean
|
|
gst_base_sink_handle_event (GstBaseSink * basesink, GstEvent * event)
|
|
{
|
|
GstBaseSinkClass *bclass;
|
|
gboolean ret;
|
|
|
|
switch (GST_EVENT_TYPE (event)) {
|
|
case GST_EVENT_EOS:
|
|
GST_LOCK (basesink);
|
|
if (basesink->clock) {
|
|
/* wait for last buffer to finish if we have a valid end time */
|
|
if (GST_CLOCK_TIME_IS_VALID (basesink->end_time)) {
|
|
basesink->clock_id = gst_clock_new_single_shot_id (basesink->clock,
|
|
basesink->end_time);
|
|
GST_UNLOCK (basesink);
|
|
|
|
gst_clock_id_wait (basesink->clock_id, NULL);
|
|
|
|
GST_LOCK (basesink);
|
|
if (basesink->clock_id) {
|
|
gst_clock_id_unref (basesink->clock_id);
|
|
basesink->clock_id = NULL;
|
|
}
|
|
basesink->end_time = GST_CLOCK_TIME_NONE;
|
|
}
|
|
}
|
|
GST_UNLOCK (basesink);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
bclass = GST_BASE_SINK_GET_CLASS (basesink);
|
|
if (bclass->event)
|
|
ret = bclass->event (basesink, event);
|
|
else
|
|
ret = TRUE;
|
|
|
|
switch (GST_EVENT_TYPE (event)) {
|
|
case GST_EVENT_EOS:
|
|
GST_PREROLL_LOCK (basesink->sinkpad);
|
|
/* if we are still EOS, we can post the EOS message */
|
|
if (basesink->eos) {
|
|
/* ok, now we can post the message */
|
|
GST_DEBUG_OBJECT (basesink, "Now posting EOS");
|
|
gst_element_post_message (GST_ELEMENT (basesink),
|
|
gst_message_new_eos (GST_OBJECT (basesink)));
|
|
}
|
|
GST_PREROLL_UNLOCK (basesink->sinkpad);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
GST_DEBUG ("event unref %p %p", basesink, event);
|
|
gst_event_unref (event);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* handle a buffer
|
|
*
|
|
* 1) first sync on the buffer
|
|
* 2) render the buffer
|
|
* 3) unref the buffer
|
|
*/
|
|
static inline GstFlowReturn
|
|
gst_base_sink_handle_buffer (GstBaseSink * basesink, GstBuffer * buf)
|
|
{
|
|
GstFlowReturn ret = GST_FLOW_OK;
|
|
gboolean render;
|
|
|
|
render = gst_base_sink_do_sync (basesink, buf);
|
|
|
|
if (render) {
|
|
GstBaseSinkClass *bclass;
|
|
|
|
bclass = GST_BASE_SINK_GET_CLASS (basesink);
|
|
if (bclass->render)
|
|
ret = bclass->render (basesink, buf);
|
|
}
|
|
|
|
GST_DEBUG ("buffer unref after render %p", basesink, buf);
|
|
gst_buffer_unref (buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_base_sink_chain (GstPad * pad, GstBuffer * buf)
|
|
{
|
|
GstBaseSink *basesink;
|
|
GstFlowReturn result;
|
|
|
|
basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
|
|
|
|
if (!(basesink->pad_mode == GST_ACTIVATE_PUSH)) {
|
|
GST_LOCK (pad);
|
|
g_warning ("Push on pad %s:%s, but it was not activated in push mode",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
GST_UNLOCK (pad);
|
|
result = GST_FLOW_UNEXPECTED;
|
|
goto done;
|
|
}
|
|
|
|
result = gst_base_sink_handle_object (basesink, pad, GST_MINI_OBJECT (buf));
|
|
|
|
done:
|
|
gst_object_unref (basesink);
|
|
|
|
return result;
|
|
}
|
|
|
|
static void
|
|
gst_base_sink_loop (GstPad * pad)
|
|
{
|
|
GstBaseSink *basesink;
|
|
GstBuffer *buf = NULL;
|
|
GstFlowReturn result;
|
|
|
|
basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
|
|
|
|
g_assert (basesink->pad_mode == GST_ACTIVATE_PULL);
|
|
|
|
result = gst_pad_pull_range (pad, basesink->offset, DEFAULT_SIZE, &buf);
|
|
if (result != GST_FLOW_OK)
|
|
goto paused;
|
|
|
|
result = gst_base_sink_handle_object (basesink, pad, GST_MINI_OBJECT (buf));
|
|
if (result != GST_FLOW_OK)
|
|
goto paused;
|
|
|
|
gst_object_unref (basesink);
|
|
|
|
/* default */
|
|
return;
|
|
|
|
paused:
|
|
{
|
|
gst_base_sink_event (pad, gst_event_new_eos ());
|
|
gst_object_unref (basesink);
|
|
gst_pad_pause_task (pad);
|
|
return;
|
|
}
|
|
}
|
|
|
|
static gboolean
|
|
gst_base_sink_deactivate (GstBaseSink * basesink, GstPad * pad)
|
|
{
|
|
gboolean result = FALSE;
|
|
GstBaseSinkClass *bclass;
|
|
|
|
bclass = GST_BASE_SINK_GET_CLASS (basesink);
|
|
|
|
/* step 1, unblock clock sync (if any) or any other blocking thing */
|
|
GST_PREROLL_LOCK (pad);
|
|
GST_LOCK (basesink);
|
|
if (basesink->clock_id) {
|
|
gst_clock_id_unschedule (basesink->clock_id);
|
|
}
|
|
GST_UNLOCK (basesink);
|
|
|
|
/* unlock any subclasses */
|
|
if (bclass->unlock)
|
|
bclass->unlock (basesink);
|
|
|
|
/* flush out the data thread if it's locked in finish_preroll */
|
|
basesink->need_preroll = FALSE;
|
|
gst_base_sink_preroll_queue_flush (basesink, pad);
|
|
GST_PREROLL_SIGNAL (pad);
|
|
GST_PREROLL_UNLOCK (pad);
|
|
|
|
/* step 2, make sure streaming finishes */
|
|
result = gst_pad_stop_task (pad);
|
|
|
|
return result;
|
|
}
|
|
|
|
static gboolean
|
|
gst_base_sink_activate (GstPad * pad)
|
|
{
|
|
gboolean result = FALSE;
|
|
GstBaseSink *basesink;
|
|
|
|
basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
|
|
|
|
GST_DEBUG_OBJECT (basesink, "Trying pull mode first");
|
|
|
|
if (basesink->can_activate_pull && gst_pad_check_pull_range (pad)
|
|
&& gst_pad_activate_pull (pad, TRUE)) {
|
|
GST_DEBUG_OBJECT (basesink, "Success activating pull mode");
|
|
result = TRUE;
|
|
} else {
|
|
GST_DEBUG_OBJECT (basesink, "Falling back to push mode");
|
|
if (gst_pad_activate_push (pad, TRUE)) {
|
|
GST_DEBUG_OBJECT (basesink, "Success activating push mode");
|
|
result = TRUE;
|
|
}
|
|
}
|
|
|
|
if (!result) {
|
|
GST_WARNING_OBJECT (basesink, "Could not activate pad in either mode");
|
|
}
|
|
|
|
gst_object_unref (basesink);
|
|
|
|
return result;
|
|
}
|
|
|
|
static gboolean
|
|
gst_base_sink_activate_push (GstPad * pad, gboolean active)
|
|
{
|
|
gboolean result;
|
|
GstBaseSink *basesink;
|
|
|
|
basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
|
|
|
|
if (active) {
|
|
if (!basesink->can_activate_push) {
|
|
result = FALSE;
|
|
basesink->pad_mode = GST_ACTIVATE_NONE;
|
|
} else {
|
|
result = TRUE;
|
|
basesink->pad_mode = GST_ACTIVATE_PUSH;
|
|
}
|
|
} else {
|
|
if (G_UNLIKELY (basesink->pad_mode != GST_ACTIVATE_PUSH)) {
|
|
g_warning ("Internal GStreamer activation error!!!");
|
|
result = FALSE;
|
|
} else {
|
|
result = gst_base_sink_deactivate (basesink, pad);
|
|
basesink->pad_mode = GST_ACTIVATE_NONE;
|
|
}
|
|
}
|
|
|
|
gst_object_unref (basesink);
|
|
|
|
return result;
|
|
}
|
|
|
|
/* this won't get called until we implement an activate function */
|
|
static gboolean
|
|
gst_base_sink_activate_pull (GstPad * pad, gboolean active)
|
|
{
|
|
gboolean result = FALSE;
|
|
GstBaseSink *basesink;
|
|
|
|
basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
|
|
|
|
if (active) {
|
|
if (!basesink->can_activate_pull) {
|
|
result = FALSE;
|
|
basesink->pad_mode = GST_ACTIVATE_NONE;
|
|
} else {
|
|
GstPad *peer = gst_pad_get_peer (pad);
|
|
|
|
if (G_UNLIKELY (peer == NULL)) {
|
|
g_warning ("Trying to activate pad in pull mode, but no peer");
|
|
result = FALSE;
|
|
} else {
|
|
if (gst_pad_activate_pull (peer, TRUE)) {
|
|
basesink->have_newsegment = TRUE;
|
|
basesink->segment_start = basesink->segment_stop = 0;
|
|
result =
|
|
gst_pad_start_task (pad, (GstTaskFunction) gst_base_sink_loop,
|
|
pad);
|
|
} else {
|
|
GST_DEBUG_OBJECT (pad, "Failed to activate peer in pull mode");
|
|
result = FALSE;
|
|
}
|
|
gst_object_unref (peer);
|
|
}
|
|
|
|
basesink->pad_mode = result ? GST_ACTIVATE_PULL : GST_ACTIVATE_NONE;
|
|
}
|
|
} else {
|
|
if (G_UNLIKELY (basesink->pad_mode != GST_ACTIVATE_PULL)) {
|
|
g_warning ("Internal GStreamer activation error!!!");
|
|
result = FALSE;
|
|
} else {
|
|
basesink->have_newsegment = FALSE;
|
|
result = gst_base_sink_deactivate (basesink, pad);
|
|
basesink->pad_mode = GST_ACTIVATE_NONE;
|
|
}
|
|
}
|
|
|
|
gst_object_unref (basesink);
|
|
|
|
return result;
|
|
}
|
|
|
|
static GstStateChangeReturn
|
|
gst_base_sink_change_state (GstElement * element, GstStateChange transition)
|
|
{
|
|
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
|
|
GstBaseSink *basesink = GST_BASE_SINK (element);
|
|
GstBaseSinkClass *bclass;
|
|
|
|
bclass = GST_BASE_SINK_GET_CLASS (basesink);
|
|
|
|
switch (transition) {
|
|
case GST_STATE_CHANGE_NULL_TO_READY:
|
|
if (bclass->start)
|
|
if (!bclass->start (basesink))
|
|
goto start_failed;
|
|
break;
|
|
case GST_STATE_CHANGE_READY_TO_PAUSED:
|
|
/* need to complete preroll before this state change completes, there
|
|
* is no data flow in READY so we can safely assume we need to preroll. */
|
|
basesink->offset = 0;
|
|
GST_PREROLL_LOCK (basesink->sinkpad);
|
|
basesink->have_preroll = FALSE;
|
|
basesink->need_preroll = TRUE;
|
|
GST_PREROLL_UNLOCK (basesink->sinkpad);
|
|
basesink->have_newsegment = FALSE;
|
|
basesink->segment_rate = 1.0;
|
|
basesink->segment_start = 0;
|
|
basesink->segment_stop = 0;
|
|
ret = GST_STATE_CHANGE_ASYNC;
|
|
break;
|
|
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
|
|
{
|
|
GST_PREROLL_LOCK (basesink->sinkpad);
|
|
/* if we have EOS, we should empty the queue now as there will
|
|
* be no more data received in the chain function.
|
|
* FIXME, this could block the state change function too long when
|
|
* we are pushing and syncing the buffers, better start a new
|
|
* thread to do this. */
|
|
if (basesink->eos) {
|
|
gst_base_sink_preroll_queue_empty (basesink, basesink->sinkpad);
|
|
} else if (!basesink->have_preroll) {
|
|
/* don't need preroll, but do queue a commit_state */
|
|
basesink->need_preroll = FALSE;
|
|
basesink->playing_async = TRUE;
|
|
ret = GST_STATE_CHANGE_ASYNC;
|
|
/* we know it's not waiting, no need to signal */
|
|
} else {
|
|
/* don't need the preroll anymore */
|
|
basesink->need_preroll = FALSE;
|
|
/* now let it play */
|
|
GST_PREROLL_SIGNAL (basesink->sinkpad);
|
|
}
|
|
GST_PREROLL_UNLOCK (basesink->sinkpad);
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
|
|
{
|
|
GstStateChangeReturn bret;
|
|
|
|
bret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
|
|
|
|
if (bret != GST_STATE_CHANGE_SUCCESS)
|
|
goto activate_failed;
|
|
}
|
|
|
|
switch (transition) {
|
|
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
|
|
{
|
|
GstBaseSinkClass *bclass;
|
|
|
|
bclass = GST_BASE_SINK_GET_CLASS (basesink);
|
|
|
|
GST_PREROLL_LOCK (basesink->sinkpad);
|
|
GST_LOCK (basesink);
|
|
/* unlock clock wait if any */
|
|
if (basesink->clock_id) {
|
|
gst_clock_id_unschedule (basesink->clock_id);
|
|
}
|
|
GST_UNLOCK (basesink);
|
|
|
|
basesink->playing_async = FALSE;
|
|
|
|
/* unlock any subclasses */
|
|
if (bclass->unlock)
|
|
bclass->unlock (basesink);
|
|
|
|
/* if we don't have a preroll buffer and we have not received EOS,
|
|
* we need to wait for a preroll */
|
|
GST_DEBUG ("have_preroll: %d, EOS: %d", basesink->have_preroll,
|
|
basesink->eos);
|
|
if (!basesink->have_preroll && !basesink->eos) {
|
|
basesink->need_preroll = TRUE;
|
|
ret = GST_STATE_CHANGE_ASYNC;
|
|
}
|
|
GST_PREROLL_UNLOCK (basesink->sinkpad);
|
|
break;
|
|
}
|
|
case GST_STATE_CHANGE_PAUSED_TO_READY:
|
|
break;
|
|
case GST_STATE_CHANGE_READY_TO_NULL:
|
|
if (bclass->stop)
|
|
if (!bclass->stop (basesink)) {
|
|
GST_WARNING ("failed to stop");
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
|
|
/* ERRORS */
|
|
start_failed:
|
|
{
|
|
GST_DEBUG ("failed to start");
|
|
return GST_STATE_CHANGE_FAILURE;
|
|
}
|
|
activate_failed:
|
|
{
|
|
GST_DEBUG ("element failed to change states -- activation problem?");
|
|
return GST_STATE_CHANGE_FAILURE;
|
|
}
|
|
}
|