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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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370 lines
10 KiB
C
370 lines
10 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., 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: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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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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gulong seed;
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glong min, max;
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GstPad *sinkpad, *srcpad;
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guint64 offset;
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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);
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static gboolean gst_rnd_buffer_size_activate_pull (GstPad * pad,
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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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#define DEBUG_INIT(bla) \
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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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GType gst_rnd_buffer_size_get_type (void);
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GST_BOILERPLATE_FULL (GstRndBufferSize, gst_rnd_buffer_size, GstElement,
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GST_TYPE_ELEMENT, DEBUG_INIT);
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static void
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gst_rnd_buffer_size_base_init (gpointer g_class)
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{
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GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
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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_details_simple (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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}
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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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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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gstelement_class->change_state =
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GST_DEBUG_FUNCPTR (gst_rnd_buffer_size_change_state);
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/* FIXME 0.11: these should all be int instead of long, to avoid bugs
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* when passing these as varargs with g_object_set(), and there was no
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* reason to use long in the first place here */
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g_object_class_install_property (gobject_class, ARG_SEED,
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g_param_spec_ulong ("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, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
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g_object_class_install_property (gobject_class, ARG_MINIMUM,
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g_param_spec_long ("min", "mininum", "mininum buffer size",
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0, G_MAXINT32, DEFAULT_MIN, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
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g_object_class_install_property (gobject_class, ARG_MAXIMUM,
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g_param_spec_long ("max", "maximum", "maximum buffer size",
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1, G_MAXINT32, DEFAULT_MAX, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
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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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GstRndBufferSizeClass * g_class)
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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_activatepull_function (self->sinkpad,
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GST_DEBUG_FUNCPTR (gst_rnd_buffer_size_activate_pull));
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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_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_ulong (value);
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break;
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case ARG_MINIMUM:
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self->min = g_value_get_long (value);
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break;
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case ARG_MAXIMUM:
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self->max = g_value_get_long (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_ulong (value, self->seed);
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break;
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case ARG_MINIMUM:
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g_value_set_long (value, self->min);
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break;
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case ARG_MAXIMUM:
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g_value_set_long (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)
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{
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if (gst_pad_check_pull_range (pad)) {
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return gst_pad_activate_pull (pad, TRUE);
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} else {
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GST_INFO_OBJECT (pad, "push mode not supported");
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return FALSE;
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}
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}
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static gboolean
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gst_rnd_buffer_size_activate_pull (GstPad * pad, gboolean active)
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{
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GstRndBufferSize *self = GST_RND_BUFFER_SIZE (GST_OBJECT_PARENT (pad));
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if (active) {
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GST_INFO_OBJECT (self, "starting pull");
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return gst_pad_start_task (pad, (GstTaskFunction) gst_rnd_buffer_size_loop,
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self);
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} else {
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GST_INFO_OBJECT (self, "stopping pull");
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return gst_pad_stop_task (pad);
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}
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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;
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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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if (GST_BUFFER_SIZE (buf) < num_bytes) {
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GST_WARNING_OBJECT (self, "short buffer: %u bytes", GST_BUFFER_SIZE (buf));
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}
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self->offset += GST_BUFFER_SIZE (buf);
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ret = gst_pad_push (self->srcpad, buf);
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if (ret != GST_FLOW_OK)
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goto push_failed;
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return;
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pause_task:
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{
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GST_DEBUG_OBJECT (self, "pausing task");
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gst_pad_pause_task (self->sinkpad);
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return;
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}
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pull_failed:
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{
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if (ret == GST_FLOW_UNEXPECTED) {
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GST_DEBUG_OBJECT (self, "eos");
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gst_pad_push_event (self->srcpad, gst_event_new_eos ());
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} else {
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GST_WARNING_OBJECT (self, "pull_range flow: %s", gst_flow_get_name (ret));
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}
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goto pause_task;
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}
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push_failed:
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{
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GST_DEBUG_OBJECT (self, "push flow: %s", gst_flow_get_name (ret));
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if (ret == GST_FLOW_UNEXPECTED) {
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GST_DEBUG_OBJECT (self, "eos");
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gst_pad_push_event (self->srcpad, gst_event_new_eos ());
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} else if (GST_FLOW_IS_FATAL (ret) || ret == GST_FLOW_NOT_LINKED) {
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GST_ELEMENT_ERROR (self, STREAM, FAILED,
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("Internal data stream error."),
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("streaming stopped, reason: %s", gst_flow_get_name (ret)));
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}
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goto pause_task;
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}
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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=%ld, min=%ld", self->min, self->max));
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goto pause_task;
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}
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}
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static GstStateChangeReturn
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gst_rnd_buffer_size_change_state (GstElement * element,
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GstStateChange transition)
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{
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GstRndBufferSize *self = GST_RND_BUFFER_SIZE (element);
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GstStateChangeReturn ret;
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switch (transition) {
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case GST_STATE_CHANGE_NULL_TO_READY:
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break;
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case GST_STATE_CHANGE_READY_TO_PAUSED:
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self->offset = 0;
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if (!self->rand) {
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self->rand = g_rand_new_with_seed (self->seed);
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}
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break;
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case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
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break;
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default:
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break;
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}
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ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
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switch (transition) {
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case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
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break;
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case GST_STATE_CHANGE_PAUSED_TO_READY:
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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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break;
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case GST_STATE_CHANGE_READY_TO_NULL:
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break;
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default:
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break;
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}
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return ret;
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}
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