summaryrefslogtreecommitdiffstats
path: root/gst/debug/rndbuffersize.c
blob: 7a8abd6b66f8256d8528213bf6f433d82b3f3de7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
/* 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;
  gulong seed;
  glong min, max;

  GstPad *sinkpad, *srcpad;
  guint64 offset;
};

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);

static gboolean gst_rnd_buffer_size_activate (GstPad * pad);
static gboolean gst_rnd_buffer_size_activate_pull (GstPad * pad,
    gboolean active);
static void gst_rnd_buffer_size_loop (GstRndBufferSize * self);
static GstStateChangeReturn gst_rnd_buffer_size_change_state (GstElement *
    element, GstStateChange transition);

#define DEBUG_INIT(bla) \
  GST_DEBUG_CATEGORY_INIT (gst_rnd_buffer_size_debug, "rndbuffersize", 0, \
      "rndbuffersize element");

GST_BOILERPLATE_FULL (GstRndBufferSize, gst_rnd_buffer_size, GstElement,
    GST_TYPE_ELEMENT, DEBUG_INIT);


static void
gst_rnd_buffer_size_base_init (gpointer g_class)
{
  GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);

  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_details_simple (gstelement_class, "Random buffer size",
      "Testing", "pull random sized buffers",
      "Stefan Kost <stefan.kost@nokia.com>)");
}


static void
gst_rnd_buffer_size_class_init (GstRndBufferSizeClass * klass)
{
  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
  GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);

  gobject_class->set_property =
      GST_DEBUG_FUNCPTR (gst_rnd_buffer_size_set_property);
  gobject_class->get_property =
      GST_DEBUG_FUNCPTR (gst_rnd_buffer_size_get_property);
  gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_rnd_buffer_size_finalize);

  gstelement_class->change_state =
      GST_DEBUG_FUNCPTR (gst_rnd_buffer_size_change_state);

  /* FIXME 0.11: these should all be int instead of long, to avoid bugs
   * when passing these as varargs with g_object_set(), and there was no
   * reason to use long in the first place here */
  g_object_class_install_property (gobject_class, ARG_SEED,
      g_param_spec_ulong ("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_object_class_install_property (gobject_class, ARG_MINIMUM,
      g_param_spec_long ("min", "mininum", "mininum buffer size",
          0, G_MAXINT32, DEFAULT_MIN, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
  g_object_class_install_property (gobject_class, ARG_MAXIMUM,
      g_param_spec_long ("max", "maximum", "maximum buffer size",
          1, G_MAXINT32, DEFAULT_MAX, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
}

static void
gst_rnd_buffer_size_init (GstRndBufferSize * self,
    GstRndBufferSizeClass * g_class)
{
  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));
  gst_pad_set_activatepull_function (self->sinkpad,
      GST_DEBUG_FUNCPTR (gst_rnd_buffer_size_activate_pull));
  gst_element_add_pad (GST_ELEMENT (self), self->sinkpad);

  self->srcpad = gst_pad_new_from_static_template (&src_template, "src");
  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_ulong (value);
      break;
    case ARG_MINIMUM:
      self->min = g_value_get_long (value);
      break;
    case ARG_MAXIMUM:
      self->max = g_value_get_long (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_ulong (value, self->seed);
      break;
    case ARG_MINIMUM:
      g_value_set_long (value, self->min);
      break;
    case ARG_MAXIMUM:
      g_value_set_long (value, self->max);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}


static gboolean
gst_rnd_buffer_size_activate (GstPad * pad)
{
  if (gst_pad_check_pull_range (pad)) {
    return gst_pad_activate_pull (pad, TRUE);
  } else {
    GST_INFO_OBJECT (pad, "push mode not supported");
    return FALSE;
  }
}


static gboolean
gst_rnd_buffer_size_activate_pull (GstPad * pad, gboolean active)
{
  GstRndBufferSize *self = GST_RND_BUFFER_SIZE (GST_OBJECT_PARENT (pad));

  if (active) {
    GST_INFO_OBJECT (self, "starting pull");
    return gst_pad_start_task (pad, (GstTaskFunction) gst_rnd_buffer_size_loop,
        self);
  } else {
    GST_INFO_OBJECT (self, "stopping pull");
    return gst_pad_stop_task (pad);
  }
}


static void
gst_rnd_buffer_size_loop (GstRndBufferSize * self)
{
  GstBuffer *buf = NULL;
  GstFlowReturn ret;
  guint num_bytes;

  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;

  if (GST_BUFFER_SIZE (buf) < num_bytes) {
    GST_WARNING_OBJECT (self, "short buffer: %u bytes", GST_BUFFER_SIZE (buf));
  }

  self->offset += GST_BUFFER_SIZE (buf);

  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_UNEXPECTED) {
      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_UNEXPECTED) {
      GST_DEBUG_OBJECT (self, "eos");
      gst_pad_push_event (self->srcpad, gst_event_new_eos ());
    } else if (GST_FLOW_IS_FATAL (ret) || 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=%ld, min=%ld", 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;
}