2 * Copyright (C) 2007 Nokia Corporation (contact <stefan.kost@nokia.com>)
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
20 * SECTION:element-rndbuffersize
22 * This element pulls buffers with random sizes from the source.
31 GST_DEBUG_CATEGORY_STATIC (gst_rnd_buffer_size_debug);
32 #define GST_CAT_DEFAULT gst_rnd_buffer_size_debug
34 #define GST_TYPE_RND_BUFFER_SIZE (gst_rnd_buffer_size_get_type())
35 #define GST_RND_BUFFER_SIZE(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_RND_BUFFER_SIZE,GstRndBufferSize))
36 #define GST_RND_BUFFER_SIZE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_RND_BUFFER_SIZE,GstRndBufferSizeClass))
37 #define GST_IS_RND_BUFFER_SIZE(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_RND_BUFFER_SIZE))
38 #define GST_IS_RND_BUFFER_SIZE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_RND_BUFFER_SIZE))
40 typedef struct _GstRndBufferSize GstRndBufferSize;
41 typedef struct _GstRndBufferSizeClass GstRndBufferSizeClass;
43 struct _GstRndBufferSize
52 GstPad *sinkpad, *srcpad;
55 gboolean need_newsegment;
58 struct _GstRndBufferSizeClass
60 GstElementClass parent_class;
70 #define DEFAULT_SEED 0
72 #define DEFAULT_MAX (8*1024)
74 static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
79 static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
84 static void gst_rnd_buffer_size_finalize (GObject * object);
85 static void gst_rnd_buffer_size_set_property (GObject * object, guint prop_id,
86 const GValue * value, GParamSpec * pspec);
87 static void gst_rnd_buffer_size_get_property (GObject * object, guint prop_id,
88 GValue * value, GParamSpec * pspec);
90 static gboolean gst_rnd_buffer_size_activate (GstPad * pad, GstObject * parent);
91 static gboolean gst_rnd_buffer_size_activate_mode (GstPad * pad,
92 GstObject * parent, GstPadMode mode, gboolean active);
93 static void gst_rnd_buffer_size_loop (GstRndBufferSize * self);
94 static GstStateChangeReturn gst_rnd_buffer_size_change_state (GstElement *
95 element, GstStateChange transition);
96 static gboolean gst_rnd_buffer_size_src_event (GstPad * pad,
97 GstObject * parent, GstEvent * event);
99 GType gst_rnd_buffer_size_get_type (void);
100 #define gst_rnd_buffer_size_parent_class parent_class
101 G_DEFINE_TYPE (GstRndBufferSize, gst_rnd_buffer_size, GST_TYPE_ELEMENT);
104 gst_rnd_buffer_size_class_init (GstRndBufferSizeClass * klass)
106 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
107 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
109 GST_DEBUG_CATEGORY_INIT (gst_rnd_buffer_size_debug, "rndbuffersize", 0,
110 "rndbuffersize element");
112 gobject_class->set_property = gst_rnd_buffer_size_set_property;
113 gobject_class->get_property = gst_rnd_buffer_size_get_property;
114 gobject_class->finalize = gst_rnd_buffer_size_finalize;
116 gst_element_class_add_pad_template (gstelement_class,
117 gst_static_pad_template_get (&sink_template));
118 gst_element_class_add_pad_template (gstelement_class,
119 gst_static_pad_template_get (&src_template));
121 gst_element_class_set_static_metadata (gstelement_class, "Random buffer size",
122 "Testing", "pull random sized buffers",
123 "Stefan Kost <stefan.kost@nokia.com>");
125 gstelement_class->change_state =
126 GST_DEBUG_FUNCPTR (gst_rnd_buffer_size_change_state);
128 /* FIXME 0.11: these should all be int instead of long, to avoid bugs
129 * when passing these as varargs with g_object_set(), and there was no
130 * reason to use long in the first place here */
131 g_object_class_install_property (gobject_class, ARG_SEED,
132 g_param_spec_ulong ("seed", "random number seed",
133 "seed for randomness (initialized when going from READY to PAUSED)",
134 0, G_MAXUINT32, DEFAULT_SEED,
135 G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
136 g_object_class_install_property (gobject_class, ARG_MINIMUM,
137 g_param_spec_long ("min", "mininum", "mininum buffer size",
138 0, G_MAXINT32, DEFAULT_MIN,
139 G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
140 g_object_class_install_property (gobject_class, ARG_MAXIMUM,
141 g_param_spec_long ("max", "maximum", "maximum buffer size",
142 1, G_MAXINT32, DEFAULT_MAX,
143 G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
147 gst_rnd_buffer_size_init (GstRndBufferSize * self)
149 self->sinkpad = gst_pad_new_from_static_template (&sink_template, "sink");
150 gst_pad_set_activate_function (self->sinkpad,
151 GST_DEBUG_FUNCPTR (gst_rnd_buffer_size_activate));
152 gst_pad_set_activatemode_function (self->sinkpad,
153 GST_DEBUG_FUNCPTR (gst_rnd_buffer_size_activate_mode));
154 gst_element_add_pad (GST_ELEMENT (self), self->sinkpad);
156 self->srcpad = gst_pad_new_from_static_template (&src_template, "src");
157 gst_pad_set_event_function (self->srcpad,
158 GST_DEBUG_FUNCPTR (gst_rnd_buffer_size_src_event));
159 gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
164 gst_rnd_buffer_size_finalize (GObject * object)
166 GstRndBufferSize *self = GST_RND_BUFFER_SIZE (object);
169 g_rand_free (self->rand);
173 G_OBJECT_CLASS (parent_class)->finalize (object);
178 gst_rnd_buffer_size_set_property (GObject * object, guint prop_id,
179 const GValue * value, GParamSpec * pspec)
181 GstRndBufferSize *self = GST_RND_BUFFER_SIZE (object);
185 self->seed = g_value_get_ulong (value);
188 self->min = g_value_get_long (value);
191 self->max = g_value_get_long (value);
194 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
201 gst_rnd_buffer_size_get_property (GObject * object, guint prop_id,
202 GValue * value, GParamSpec * pspec)
204 GstRndBufferSize *self = GST_RND_BUFFER_SIZE (object);
208 g_value_set_ulong (value, self->seed);
211 g_value_set_long (value, self->min);
214 g_value_set_long (value, self->max);
217 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
224 gst_rnd_buffer_size_activate (GstPad * pad, GstObject * parent)
229 query = gst_query_new_scheduling ();
231 if (!gst_pad_peer_query (pad, query)) {
232 gst_query_unref (query);
236 pull_mode = gst_query_has_scheduling_mode (query, GST_PAD_MODE_PULL);
237 gst_query_unref (query);
242 GST_DEBUG_OBJECT (pad, "activating pull");
243 return gst_pad_activate_mode (pad, GST_PAD_MODE_PULL, TRUE);
248 GST_DEBUG_OBJECT (pad, "pull mode not supported");
255 gst_rnd_buffer_size_activate_mode (GstPad * pad, GstObject * parent,
256 GstPadMode mode, gboolean active)
259 GstRndBufferSize *self = GST_RND_BUFFER_SIZE (parent);
262 case GST_PAD_MODE_PULL:
264 GST_INFO_OBJECT (self, "starting pull");
266 gst_pad_start_task (pad, (GstTaskFunction) gst_rnd_buffer_size_loop,
268 self->need_newsegment = TRUE;
270 GST_INFO_OBJECT (self, "stopping pull");
271 res = gst_pad_stop_task (pad);
282 gst_rnd_buffer_size_src_event (GstPad * pad, GstObject * parent,
285 GstRndBufferSize *self;
286 GstSeekType start_type;
291 if (GST_EVENT_TYPE (event) != GST_EVENT_SEEK) {
292 GST_WARNING_OBJECT (pad, "dropping %s event", GST_EVENT_TYPE_NAME (event));
296 self = GST_RND_BUFFER_SIZE (parent);
297 gst_event_parse_seek (event, NULL, &format, &flags, &start_type, &start,
300 if (format != GST_FORMAT_BYTES) {
301 GST_WARNING_OBJECT (pad, "only BYTE format supported");
304 if (start_type != GST_SEEK_TYPE_SET) {
305 GST_WARNING_OBJECT (pad, "only SEEK_TYPE_SET supported");
309 if ((flags & GST_SEEK_FLAG_FLUSH)) {
310 gst_pad_push_event (self->srcpad, gst_event_new_flush_start ());
311 gst_pad_push_event (self->sinkpad, gst_event_new_flush_start ());
313 gst_pad_pause_task (self->sinkpad);
316 GST_PAD_STREAM_LOCK (self->sinkpad);
318 gst_pad_push_event (self->srcpad, gst_event_new_flush_stop (TRUE));
319 gst_pad_push_event (self->sinkpad, gst_event_new_flush_stop (TRUE));
321 GST_INFO_OBJECT (pad, "seeking to offset %" G_GINT64_FORMAT, start);
323 self->offset = start;
324 self->need_newsegment = TRUE;
326 gst_pad_start_task (self->sinkpad, (GstTaskFunction) gst_rnd_buffer_size_loop,
329 GST_PAD_STREAM_UNLOCK (self->sinkpad);
334 gst_rnd_buffer_size_loop (GstRndBufferSize * self)
336 GstBuffer *buf = NULL;
338 guint num_bytes, size;
340 if (G_UNLIKELY (self->min > self->max))
343 if (G_UNLIKELY (self->min != self->max)) {
344 num_bytes = g_rand_int_range (self->rand, self->min, self->max);
346 num_bytes = self->min;
349 GST_LOG_OBJECT (self, "pulling %u bytes at offset %" G_GUINT64_FORMAT,
350 num_bytes, self->offset);
352 ret = gst_pad_pull_range (self->sinkpad, self->offset, num_bytes, &buf);
354 if (ret != GST_FLOW_OK)
357 size = gst_buffer_get_size (buf);
359 if (size < num_bytes) {
360 GST_WARNING_OBJECT (self, "short buffer: %u bytes", size);
363 if (self->need_newsegment) {
366 gst_segment_init (&segment, GST_FORMAT_BYTES);
367 segment.start = self->offset;
368 gst_pad_push_event (self->srcpad, gst_event_new_segment (&segment));
369 self->need_newsegment = FALSE;
372 self->offset += size;
374 ret = gst_pad_push (self->srcpad, buf);
376 if (ret != GST_FLOW_OK)
383 GST_DEBUG_OBJECT (self, "pausing task");
384 gst_pad_pause_task (self->sinkpad);
390 if (ret == GST_FLOW_EOS) {
391 GST_DEBUG_OBJECT (self, "eos");
392 gst_pad_push_event (self->srcpad, gst_event_new_eos ());
394 GST_WARNING_OBJECT (self, "pull_range flow: %s", gst_flow_get_name (ret));
401 GST_DEBUG_OBJECT (self, "push flow: %s", gst_flow_get_name (ret));
402 if (ret == GST_FLOW_EOS) {
403 GST_DEBUG_OBJECT (self, "eos");
404 gst_pad_push_event (self->srcpad, gst_event_new_eos ());
405 } else if (ret < GST_FLOW_EOS || ret == GST_FLOW_NOT_LINKED) {
406 GST_ELEMENT_ERROR (self, STREAM, FAILED,
407 ("Internal data stream error."),
408 ("streaming stopped, reason: %s", gst_flow_get_name (ret)));
415 GST_ELEMENT_ERROR (self, LIBRARY, SETTINGS,
416 ("The minimum buffer size is smaller than the maximum buffer size."),
417 ("buffer sizes: max=%ld, min=%ld", self->min, self->max));
422 static GstStateChangeReturn
423 gst_rnd_buffer_size_change_state (GstElement * element,
424 GstStateChange transition)
426 GstRndBufferSize *self = GST_RND_BUFFER_SIZE (element);
427 GstStateChangeReturn ret;
429 switch (transition) {
430 case GST_STATE_CHANGE_NULL_TO_READY:
432 case GST_STATE_CHANGE_READY_TO_PAUSED:
435 self->rand = g_rand_new_with_seed (self->seed);
438 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
444 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
446 switch (transition) {
447 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
449 case GST_STATE_CHANGE_PAUSED_TO_READY:
451 g_rand_free (self->rand);
455 case GST_STATE_CHANGE_READY_TO_NULL: