gstreamer/gst/debugutils/rndbuffersize.c

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/* GStreamer
* Copyright (C) 2007 Nokia Corporation (contact <stefan.kost@nokia.com>)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:element-rndbuffersize
*
* This element pulls buffers with random sizes from the source.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
GST_DEBUG_CATEGORY_STATIC (gst_rnd_buffer_size_debug);
#define GST_CAT_DEFAULT gst_rnd_buffer_size_debug
#define GST_TYPE_RND_BUFFER_SIZE (gst_rnd_buffer_size_get_type())
#define GST_RND_BUFFER_SIZE(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_RND_BUFFER_SIZE,GstRndBufferSize))
#define GST_RND_BUFFER_SIZE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_RND_BUFFER_SIZE,GstRndBufferSizeClass))
#define GST_IS_RND_BUFFER_SIZE(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_RND_BUFFER_SIZE))
#define GST_IS_RND_BUFFER_SIZE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_RND_BUFFER_SIZE))
typedef struct _GstRndBufferSize GstRndBufferSize;
typedef struct _GstRndBufferSizeClass GstRndBufferSizeClass;
struct _GstRndBufferSize
{
GstElement parent;
/*< private > */
GRand *rand;
guint seed;
gint min, max;
GstPad *sinkpad, *srcpad;
guint64 offset;
gboolean need_newsegment;
};
struct _GstRndBufferSizeClass
{
GstElementClass parent_class;
};
enum
{
ARG_SEED = 1,
ARG_MINIMUM,
ARG_MAXIMUM
};
#define DEFAULT_SEED 0
#define DEFAULT_MIN 1
#define DEFAULT_MAX (8*1024)
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static void gst_rnd_buffer_size_finalize (GObject * object);
static void gst_rnd_buffer_size_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_rnd_buffer_size_get_property (GObject * object, guint prop_id,
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,
GstObject * parent, GstPadMode mode, gboolean active);
static void gst_rnd_buffer_size_loop (GstRndBufferSize * self);
static GstStateChangeReturn gst_rnd_buffer_size_change_state (GstElement *
element, GstStateChange transition);
static gboolean gst_rnd_buffer_size_src_event (GstPad * pad,
GstObject * parent, GstEvent * event);
GType gst_rnd_buffer_size_get_type (void);
#define gst_rnd_buffer_size_parent_class parent_class
G_DEFINE_TYPE (GstRndBufferSize, gst_rnd_buffer_size, GST_TYPE_ELEMENT);
static void
gst_rnd_buffer_size_class_init (GstRndBufferSizeClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
GST_DEBUG_CATEGORY_INIT (gst_rnd_buffer_size_debug, "rndbuffersize", 0,
"rndbuffersize element");
gobject_class->set_property = gst_rnd_buffer_size_set_property;
gobject_class->get_property = gst_rnd_buffer_size_get_property;
gobject_class->finalize = gst_rnd_buffer_size_finalize;
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&sink_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&src_template));
gst_element_class_set_static_metadata (gstelement_class, "Random buffer size",
"Testing", "pull random sized buffers",
"Stefan Kost <stefan.kost@nokia.com>");
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_rnd_buffer_size_change_state);
g_object_class_install_property (gobject_class, ARG_SEED,
g_param_spec_uint ("seed", "random number seed",
"seed for randomness (initialized when going from READY to PAUSED)",
0, G_MAXUINT32, DEFAULT_SEED,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, ARG_MINIMUM,
g_param_spec_int ("min", "mininum", "mininum buffer size",
0, G_MAXINT32, DEFAULT_MIN,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, ARG_MAXIMUM,
g_param_spec_int ("max", "maximum", "maximum buffer size",
1, G_MAXINT32, DEFAULT_MAX,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
}
static void
gst_rnd_buffer_size_init (GstRndBufferSize * self)
{
self->sinkpad = gst_pad_new_from_static_template (&sink_template, "sink");
gst_pad_set_activate_function (self->sinkpad,
GST_DEBUG_FUNCPTR (gst_rnd_buffer_size_activate));
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gst_pad_set_activatemode_function (self->sinkpad,
GST_DEBUG_FUNCPTR (gst_rnd_buffer_size_activate_mode));
gst_element_add_pad (GST_ELEMENT (self), self->sinkpad);
self->srcpad = gst_pad_new_from_static_template (&src_template, "src");
gst_pad_set_event_function (self->srcpad,
GST_DEBUG_FUNCPTR (gst_rnd_buffer_size_src_event));
gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
}
static void
gst_rnd_buffer_size_finalize (GObject * object)
{
GstRndBufferSize *self = GST_RND_BUFFER_SIZE (object);
if (self->rand) {
g_rand_free (self->rand);
self->rand = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_rnd_buffer_size_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstRndBufferSize *self = GST_RND_BUFFER_SIZE (object);
switch (prop_id) {
case ARG_SEED:
self->seed = g_value_get_uint (value);
break;
case ARG_MINIMUM:
self->min = g_value_get_int (value);
break;
case ARG_MAXIMUM:
self->max = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_rnd_buffer_size_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstRndBufferSize *self = GST_RND_BUFFER_SIZE (object);
switch (prop_id) {
case ARG_SEED:
g_value_set_uint (value, self->seed);
break;
case ARG_MINIMUM:
g_value_set_int (value, self->min);
break;
case ARG_MAXIMUM:
g_value_set_int (value, self->max);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
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gst_rnd_buffer_size_activate (GstPad * pad, GstObject * parent)
{
GstQuery *query;
gboolean pull_mode;
query = gst_query_new_scheduling ();
if (!gst_pad_peer_query (pad, query)) {
gst_query_unref (query);
goto no_pull;
}
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pull_mode = gst_query_has_scheduling_mode (query, GST_PAD_MODE_PULL);
gst_query_unref (query);
if (!pull_mode)
goto no_pull;
GST_DEBUG_OBJECT (pad, "activating pull");
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return gst_pad_activate_mode (pad, GST_PAD_MODE_PULL, TRUE);
/* ERRORS */
no_pull:
{
GST_DEBUG_OBJECT (pad, "pull mode not supported");
return FALSE;
}
}
static gboolean
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gst_rnd_buffer_size_activate_mode (GstPad * pad, GstObject * parent,
GstPadMode mode, gboolean active)
{
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gboolean res;
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GstRndBufferSize *self = GST_RND_BUFFER_SIZE (parent);
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switch (mode) {
case GST_PAD_MODE_PULL:
if (active) {
GST_INFO_OBJECT (self, "starting pull");
res =
gst_pad_start_task (pad, (GstTaskFunction) gst_rnd_buffer_size_loop,
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self, NULL);
self->need_newsegment = TRUE;
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} else {
GST_INFO_OBJECT (self, "stopping pull");
res = gst_pad_stop_task (pad);
}
break;
default:
res = FALSE;
break;
}
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return res;
}
static gboolean
gst_rnd_buffer_size_src_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
GstRndBufferSize *self;
GstSeekType start_type;
GstSeekFlags flags;
GstFormat format;
gint64 start;
if (GST_EVENT_TYPE (event) != GST_EVENT_SEEK) {
GST_WARNING_OBJECT (pad, "dropping %s event", GST_EVENT_TYPE_NAME (event));
return FALSE;
}
self = GST_RND_BUFFER_SIZE (parent);
gst_event_parse_seek (event, NULL, &format, &flags, &start_type, &start,
NULL, NULL);
if (format != GST_FORMAT_BYTES) {
GST_WARNING_OBJECT (pad, "only BYTE format supported");
return FALSE;
}
if (start_type != GST_SEEK_TYPE_SET) {
GST_WARNING_OBJECT (pad, "only SEEK_TYPE_SET supported");
return FALSE;
}
if ((flags & GST_SEEK_FLAG_FLUSH)) {
gst_pad_push_event (self->srcpad, gst_event_new_flush_start ());
gst_pad_push_event (self->sinkpad, gst_event_new_flush_start ());
} else {
gst_pad_pause_task (self->sinkpad);
}
GST_PAD_STREAM_LOCK (self->sinkpad);
if ((flags & GST_SEEK_FLAG_FLUSH)) {
gst_pad_push_event (self->srcpad, gst_event_new_flush_stop (TRUE));
gst_pad_push_event (self->sinkpad, gst_event_new_flush_stop (TRUE));
}
GST_INFO_OBJECT (pad, "seeking to offset %" G_GINT64_FORMAT, start);
self->offset = start;
self->need_newsegment = TRUE;
gst_pad_start_task (self->sinkpad, (GstTaskFunction) gst_rnd_buffer_size_loop,
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self, NULL);
GST_PAD_STREAM_UNLOCK (self->sinkpad);
return TRUE;
}
static void
gst_rnd_buffer_size_loop (GstRndBufferSize * self)
{
GstBuffer *buf = NULL;
GstFlowReturn ret;
guint num_bytes, size;
if (G_UNLIKELY (self->min > self->max))
goto bogus_minmax;
if (G_UNLIKELY (self->min != self->max)) {
num_bytes = g_rand_int_range (self->rand, self->min, self->max);
} else {
num_bytes = self->min;
}
GST_LOG_OBJECT (self, "pulling %u bytes at offset %" G_GUINT64_FORMAT,
num_bytes, self->offset);
ret = gst_pad_pull_range (self->sinkpad, self->offset, num_bytes, &buf);
if (ret != GST_FLOW_OK)
goto pull_failed;
size = gst_buffer_get_size (buf);
if (size < num_bytes) {
GST_WARNING_OBJECT (self, "short buffer: %u bytes", size);
}
if (self->need_newsegment) {
GstSegment segment;
gst_segment_init (&segment, GST_FORMAT_BYTES);
segment.start = self->offset;
gst_pad_push_event (self->srcpad, gst_event_new_segment (&segment));
self->need_newsegment = FALSE;
}
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:
{
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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));
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if (ret == GST_FLOW_EOS) {
GST_DEBUG_OBJECT (self, "eos");
gst_pad_push_event (self->srcpad, gst_event_new_eos ());
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} 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:
break;
default:
break;
}
return ret;
}