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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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575 lines
16 KiB
C
575 lines
16 KiB
C
/* GStreamer
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* Copyright (C) 2007 Nokia Corporation (contact <stefan.kost@nokia.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-rndbuffersize
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*
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* This element pulls buffers with random sizes from the source.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gst/gst.h>
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#include <gst/base/gstadapter.h>
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GST_DEBUG_CATEGORY_STATIC (gst_rnd_buffer_size_debug);
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#define GST_CAT_DEFAULT gst_rnd_buffer_size_debug
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#define GST_TYPE_RND_BUFFER_SIZE (gst_rnd_buffer_size_get_type())
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#define GST_RND_BUFFER_SIZE(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_RND_BUFFER_SIZE,GstRndBufferSize))
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#define GST_RND_BUFFER_SIZE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_RND_BUFFER_SIZE,GstRndBufferSizeClass))
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#define GST_IS_RND_BUFFER_SIZE(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_RND_BUFFER_SIZE))
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#define GST_IS_RND_BUFFER_SIZE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_RND_BUFFER_SIZE))
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typedef struct _GstRndBufferSize GstRndBufferSize;
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typedef struct _GstRndBufferSizeClass GstRndBufferSizeClass;
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struct _GstRndBufferSize
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{
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GstElement parent;
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/*< private > */
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GRand *rand;
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guint seed;
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gint min, max;
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GstPad *sinkpad, *srcpad;
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guint64 offset;
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gboolean need_newsegment;
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GstAdapter *adapter;
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};
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struct _GstRndBufferSizeClass
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{
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GstElementClass parent_class;
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};
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enum
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{
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ARG_SEED = 1,
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ARG_MINIMUM,
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ARG_MAXIMUM
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};
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#define DEFAULT_SEED 0
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#define DEFAULT_MIN 1
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#define DEFAULT_MAX (8*1024)
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static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS_ANY);
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static GstStaticPadTemplate sink_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_ANY);
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static void gst_rnd_buffer_size_finalize (GObject * object);
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static void gst_rnd_buffer_size_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_rnd_buffer_size_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static gboolean gst_rnd_buffer_size_activate (GstPad * pad, GstObject * parent);
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static gboolean gst_rnd_buffer_size_activate_mode (GstPad * pad,
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GstObject * parent, GstPadMode mode, gboolean active);
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static void gst_rnd_buffer_size_loop (GstRndBufferSize * self);
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static GstStateChangeReturn gst_rnd_buffer_size_change_state (GstElement *
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element, GstStateChange transition);
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static gboolean gst_rnd_buffer_size_src_event (GstPad * pad,
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GstObject * parent, GstEvent * event);
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static gboolean gst_rnd_buffer_size_sink_event (GstPad * pad,
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GstObject * parent, GstEvent * event);
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static GstFlowReturn gst_rnd_buffer_size_chain (GstPad * pad,
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GstObject * parent, GstBuffer * buffer);
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GType gst_rnd_buffer_size_get_type (void);
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#define gst_rnd_buffer_size_parent_class parent_class
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G_DEFINE_TYPE (GstRndBufferSize, gst_rnd_buffer_size, GST_TYPE_ELEMENT);
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static void
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gst_rnd_buffer_size_class_init (GstRndBufferSizeClass * 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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GST_DEBUG_CATEGORY_INIT (gst_rnd_buffer_size_debug, "rndbuffersize", 0,
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"rndbuffersize element");
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gobject_class->set_property = gst_rnd_buffer_size_set_property;
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gobject_class->get_property = gst_rnd_buffer_size_get_property;
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gobject_class->finalize = gst_rnd_buffer_size_finalize;
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&sink_template));
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&src_template));
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gst_element_class_set_static_metadata (gstelement_class, "Random buffer size",
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"Testing", "pull random sized buffers",
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"Stefan Kost <stefan.kost@nokia.com>");
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gstelement_class->change_state =
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GST_DEBUG_FUNCPTR (gst_rnd_buffer_size_change_state);
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g_object_class_install_property (gobject_class, ARG_SEED,
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g_param_spec_uint ("seed", "random number seed",
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"seed for randomness (initialized when going from READY to PAUSED)",
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0, G_MAXUINT32, DEFAULT_SEED,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, ARG_MINIMUM,
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g_param_spec_int ("min", "mininum", "mininum buffer size",
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0, G_MAXINT32, DEFAULT_MIN,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, ARG_MAXIMUM,
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g_param_spec_int ("max", "maximum", "maximum buffer size",
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1, G_MAXINT32, DEFAULT_MAX,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
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}
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static void
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gst_rnd_buffer_size_init (GstRndBufferSize * self)
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{
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self->sinkpad = gst_pad_new_from_static_template (&sink_template, "sink");
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gst_pad_set_activate_function (self->sinkpad,
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GST_DEBUG_FUNCPTR (gst_rnd_buffer_size_activate));
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gst_pad_set_activatemode_function (self->sinkpad,
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GST_DEBUG_FUNCPTR (gst_rnd_buffer_size_activate_mode));
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gst_pad_set_event_function (self->sinkpad,
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GST_DEBUG_FUNCPTR (gst_rnd_buffer_size_sink_event));
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gst_pad_set_chain_function (self->sinkpad,
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GST_DEBUG_FUNCPTR (gst_rnd_buffer_size_chain));
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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_template, "src");
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gst_pad_set_event_function (self->srcpad,
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GST_DEBUG_FUNCPTR (gst_rnd_buffer_size_src_event));
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gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
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}
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static void
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gst_rnd_buffer_size_finalize (GObject * object)
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{
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GstRndBufferSize *self = GST_RND_BUFFER_SIZE (object);
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if (self->rand) {
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g_rand_free (self->rand);
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self->rand = NULL;
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}
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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_rnd_buffer_size_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstRndBufferSize *self = GST_RND_BUFFER_SIZE (object);
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switch (prop_id) {
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case ARG_SEED:
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self->seed = g_value_get_uint (value);
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break;
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case ARG_MINIMUM:
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self->min = g_value_get_int (value);
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break;
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case ARG_MAXIMUM:
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self->max = g_value_get_int (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, 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_rnd_buffer_size_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstRndBufferSize *self = GST_RND_BUFFER_SIZE (object);
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switch (prop_id) {
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case ARG_SEED:
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g_value_set_uint (value, self->seed);
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break;
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case ARG_MINIMUM:
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g_value_set_int (value, self->min);
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break;
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case ARG_MAXIMUM:
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g_value_set_int (value, self->max);
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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 gboolean
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gst_rnd_buffer_size_activate (GstPad * pad, GstObject * parent)
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{
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GstQuery *query;
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gboolean pull_mode;
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query = gst_query_new_scheduling ();
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if (gst_pad_peer_query (pad, query))
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pull_mode = gst_query_has_scheduling_mode_with_flags (query,
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GST_PAD_MODE_PULL, GST_SCHEDULING_FLAG_SEEKABLE);
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else
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pull_mode = FALSE;
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gst_query_unref (query);
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if (pull_mode) {
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GST_DEBUG_OBJECT (pad, "activating pull");
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return gst_pad_activate_mode (pad, GST_PAD_MODE_PULL, TRUE);
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} else {
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GST_DEBUG_OBJECT (pad, "activating push");
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return gst_pad_activate_mode (pad, GST_PAD_MODE_PUSH, TRUE);
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}
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}
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static gboolean
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gst_rnd_buffer_size_activate_mode (GstPad * pad, GstObject * parent,
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GstPadMode mode, gboolean active)
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{
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gboolean res;
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GstRndBufferSize *self = GST_RND_BUFFER_SIZE (parent);
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switch (mode) {
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case GST_PAD_MODE_PULL:
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if (active) {
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GST_INFO_OBJECT (self, "starting pull");
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res =
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gst_pad_start_task (pad, (GstTaskFunction) gst_rnd_buffer_size_loop,
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self, NULL);
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self->need_newsegment = TRUE;
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} else {
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GST_INFO_OBJECT (self, "stopping pull");
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res = gst_pad_stop_task (pad);
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}
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break;
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case GST_PAD_MODE_PUSH:
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GST_INFO_OBJECT (self, "%sactivating in push mode", (active) ? "" : "de");
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res = TRUE;
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break;
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default:
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res = FALSE;
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break;
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}
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return res;
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}
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static gboolean
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gst_rnd_buffer_size_src_event (GstPad * pad, GstObject * parent,
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GstEvent * event)
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{
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GstRndBufferSize *self;
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GstSeekType start_type;
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GstSeekFlags flags;
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GstFormat format;
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gint64 start;
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if (GST_EVENT_TYPE (event) != GST_EVENT_SEEK) {
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GST_WARNING_OBJECT (pad, "dropping %s event", GST_EVENT_TYPE_NAME (event));
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return FALSE;
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}
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self = GST_RND_BUFFER_SIZE (parent);
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gst_event_parse_seek (event, NULL, &format, &flags, &start_type, &start,
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NULL, NULL);
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if (format != GST_FORMAT_BYTES) {
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GST_WARNING_OBJECT (pad, "only BYTE format supported");
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return FALSE;
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}
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if (start_type != GST_SEEK_TYPE_SET) {
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GST_WARNING_OBJECT (pad, "only SEEK_TYPE_SET supported");
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return FALSE;
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}
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if ((flags & GST_SEEK_FLAG_FLUSH)) {
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gst_pad_push_event (self->srcpad, gst_event_new_flush_start ());
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gst_pad_push_event (self->sinkpad, gst_event_new_flush_start ());
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} else {
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gst_pad_pause_task (self->sinkpad);
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}
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GST_PAD_STREAM_LOCK (self->sinkpad);
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if ((flags & GST_SEEK_FLAG_FLUSH)) {
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gst_pad_push_event (self->srcpad, gst_event_new_flush_stop (TRUE));
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gst_pad_push_event (self->sinkpad, gst_event_new_flush_stop (TRUE));
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}
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GST_INFO_OBJECT (pad, "seeking to offset %" G_GINT64_FORMAT, start);
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self->offset = start;
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self->need_newsegment = TRUE;
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gst_pad_start_task (self->sinkpad, (GstTaskFunction) gst_rnd_buffer_size_loop,
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self, NULL);
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GST_PAD_STREAM_UNLOCK (self->sinkpad);
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return TRUE;
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}
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static GstFlowReturn
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gst_rnd_buffer_size_drain_adapter (GstRndBufferSize * self, gboolean eos)
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{
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GstFlowReturn flow;
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GstBuffer *buf;
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guint num_bytes, avail;
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flow = GST_FLOW_OK;
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if (G_UNLIKELY (self->min > self->max))
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goto bogus_minmax;
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do {
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if (self->min != self->max) {
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num_bytes = g_rand_int_range (self->rand, self->min, self->max);
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} else {
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num_bytes = self->min;
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}
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GST_LOG_OBJECT (self, "pulling %u bytes out of adapter", num_bytes);
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buf = gst_adapter_take_buffer (self->adapter, num_bytes);
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if (buf == NULL) {
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if (!eos) {
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GST_LOG_OBJECT (self, "not enough bytes in adapter");
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break;
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}
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avail = gst_adapter_available (self->adapter);
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if (avail == 0)
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break;
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if (avail < self->min) {
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GST_WARNING_OBJECT (self, "discarding %u bytes at end (min=%u)",
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avail, self->min);
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gst_adapter_clear (self->adapter);
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break;
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}
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buf = gst_adapter_take_buffer (self->adapter, avail);
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g_assert (buf != NULL);
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}
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flow = gst_pad_push (self->srcpad, buf);
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}
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while (flow == GST_FLOW_OK);
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return flow;
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/* ERRORS */
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bogus_minmax:
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{
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GST_ELEMENT_ERROR (self, LIBRARY, SETTINGS,
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("The minimum buffer size is smaller than the maximum buffer size."),
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("buffer sizes: max=%d, min=%d", self->min, self->max));
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return GST_FLOW_ERROR;
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}
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}
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static gboolean
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gst_rnd_buffer_size_sink_event (GstPad * pad, GstObject * parent,
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GstEvent * event)
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{
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GstRndBufferSize *rnd = GST_RND_BUFFER_SIZE (parent);
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_EOS:
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gst_rnd_buffer_size_drain_adapter (rnd, TRUE);
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break;
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case GST_EVENT_FLUSH_STOP:
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if (rnd->adapter != NULL)
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gst_adapter_clear (rnd->adapter);
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break;
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default:
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break;
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}
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return gst_pad_push_event (rnd->srcpad, event);
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}
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static GstFlowReturn
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gst_rnd_buffer_size_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
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{
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GstRndBufferSize *rnd = GST_RND_BUFFER_SIZE (parent);
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GstFlowReturn flow;
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if (rnd->adapter == NULL)
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rnd->adapter = gst_adapter_new ();
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gst_adapter_push (rnd->adapter, buf);
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flow = gst_rnd_buffer_size_drain_adapter (rnd, FALSE);
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if (flow != GST_FLOW_OK)
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GST_INFO_OBJECT (rnd, "flow: %s", gst_flow_get_name (flow));
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return flow;
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}
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static void
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gst_rnd_buffer_size_loop (GstRndBufferSize * self)
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{
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GstBuffer *buf = NULL;
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GstFlowReturn ret;
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guint num_bytes, size;
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if (G_UNLIKELY (self->min > self->max))
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goto bogus_minmax;
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if (G_UNLIKELY (self->min != self->max)) {
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num_bytes = g_rand_int_range (self->rand, self->min, self->max);
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} else {
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num_bytes = self->min;
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}
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GST_LOG_OBJECT (self, "pulling %u bytes at offset %" G_GUINT64_FORMAT,
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num_bytes, self->offset);
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ret = gst_pad_pull_range (self->sinkpad, self->offset, num_bytes, &buf);
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if (ret != GST_FLOW_OK)
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goto pull_failed;
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size = gst_buffer_get_size (buf);
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if (size < num_bytes) {
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GST_WARNING_OBJECT (self, "short buffer: %u bytes", size);
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}
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if (self->need_newsegment) {
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GstSegment segment;
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gst_segment_init (&segment, GST_FORMAT_BYTES);
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segment.start = self->offset;
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gst_pad_push_event (self->srcpad, gst_event_new_segment (&segment));
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self->need_newsegment = FALSE;
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}
|
|
|
|
self->offset += size;
|
|
|
|
ret = gst_pad_push (self->srcpad, buf);
|
|
|
|
if (ret != GST_FLOW_OK)
|
|
goto push_failed;
|
|
|
|
return;
|
|
|
|
pause_task:
|
|
{
|
|
GST_DEBUG_OBJECT (self, "pausing task");
|
|
gst_pad_pause_task (self->sinkpad);
|
|
return;
|
|
}
|
|
|
|
pull_failed:
|
|
{
|
|
if (ret == GST_FLOW_EOS) {
|
|
GST_DEBUG_OBJECT (self, "eos");
|
|
gst_pad_push_event (self->srcpad, gst_event_new_eos ());
|
|
} else {
|
|
GST_WARNING_OBJECT (self, "pull_range flow: %s", gst_flow_get_name (ret));
|
|
}
|
|
goto pause_task;
|
|
}
|
|
|
|
push_failed:
|
|
{
|
|
GST_DEBUG_OBJECT (self, "push flow: %s", gst_flow_get_name (ret));
|
|
if (ret == GST_FLOW_EOS) {
|
|
GST_DEBUG_OBJECT (self, "eos");
|
|
gst_pad_push_event (self->srcpad, gst_event_new_eos ());
|
|
} else if (ret < GST_FLOW_EOS || ret == GST_FLOW_NOT_LINKED) {
|
|
GST_ELEMENT_ERROR (self, STREAM, FAILED,
|
|
("Internal data stream error."),
|
|
("streaming stopped, reason: %s", gst_flow_get_name (ret)));
|
|
}
|
|
goto pause_task;
|
|
}
|
|
|
|
bogus_minmax:
|
|
{
|
|
GST_ELEMENT_ERROR (self, LIBRARY, SETTINGS,
|
|
("The minimum buffer size is smaller than the maximum buffer size."),
|
|
("buffer sizes: max=%d, min=%d", self->min, self->max));
|
|
goto pause_task;
|
|
}
|
|
}
|
|
|
|
static GstStateChangeReturn
|
|
gst_rnd_buffer_size_change_state (GstElement * element,
|
|
GstStateChange transition)
|
|
{
|
|
GstRndBufferSize *self = GST_RND_BUFFER_SIZE (element);
|
|
GstStateChangeReturn ret;
|
|
|
|
switch (transition) {
|
|
case GST_STATE_CHANGE_NULL_TO_READY:
|
|
break;
|
|
case GST_STATE_CHANGE_READY_TO_PAUSED:
|
|
self->offset = 0;
|
|
if (!self->rand) {
|
|
self->rand = g_rand_new_with_seed (self->seed);
|
|
}
|
|
break;
|
|
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
|
|
|
|
switch (transition) {
|
|
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
|
|
break;
|
|
case GST_STATE_CHANGE_PAUSED_TO_READY:
|
|
if (self->rand) {
|
|
g_rand_free (self->rand);
|
|
self->rand = NULL;
|
|
}
|
|
break;
|
|
case GST_STATE_CHANGE_READY_TO_NULL:
|
|
if (self->adapter) {
|
|
g_object_unref (self->adapter);
|
|
self->adapter = NULL;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|