summaryrefslogtreecommitdiff
path: root/plugins/elements/gststreamiddemux.c
blob: 49fc29054730f4043d95748d874138e86e4abc6b (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
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
/* GStreamer streamiddemux element
 *
 * Copyright 2013 LGE Corporation.
 *  @author: Hoonhee Lee <hoonhee.lee@lge.com>
 *  @author: Jeongseok Kim <jeongseok.kim@lge.com>
 *  @author: Wonchul Lee <wonchul86.lee@lge.com>
 *
 * gststreamiddemux.c: Simple stream-id-demultiplexer element
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
 */

/**
 * SECTION:element-streamiddemux
 *
 * The basic concept was started from de-funneling element which restores one
 * serialized stream via #GstFunnel to its original state. #GstStreamidDemux
 * classifies each stream base on stream ids.
 *
 * The stream id demux always takes one input and checks how many streams
 * are contained in a stream by STREAM_START event. Likewise #GstFunnel,
 * #GstStreamidDemux does not synchronize the different output streams.
 *
 * #GstStreamidDemux:active-pad provides information about which output pad
 * is activated at the moment.
 *
 * @see_also: #GstFunnel, #gst_event_new_stream_start
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <string.h>

#include "gststreamiddemux.h"

GST_DEBUG_CATEGORY_STATIC (streamid_demux_debug);
#define GST_CAT_DEFAULT streamid_demux_debug

enum
{
  PROP_0,
  PROP_ACTIVE_PAD,
  PROP_LAST
};

static GstStaticPadTemplate gst_streamid_demux_sink_factory =
GST_STATIC_PAD_TEMPLATE ("sink",
    GST_PAD_SINK,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS_ANY);

static GstStaticPadTemplate gst_streamid_demux_src_factory =
GST_STATIC_PAD_TEMPLATE ("src_%u",
    GST_PAD_SRC,
    GST_PAD_SOMETIMES,
    GST_STATIC_CAPS_ANY);

#define _do_init \
GST_DEBUG_CATEGORY_INIT (streamid_demux_debug, \
        "streamiddemux", 0, "Streamid demuxer");
#define gst_streamid_demux_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstStreamidDemux, gst_streamid_demux,
    GST_TYPE_ELEMENT, _do_init);

static void gst_streamid_demux_dispose (GObject * object);
static void gst_streamid_demux_get_property (GObject * object, guint prop_id,
    GValue * value, GParamSpec * pspec);
static GstFlowReturn gst_streamid_demux_chain (GstPad * pad,
    GstObject * parent, GstBuffer * buf);
static gboolean gst_streamid_demux_event (GstPad * pad, GstObject * parent,
    GstEvent * event);
static GstStateChangeReturn gst_streamid_demux_change_state (GstElement *
    element, GstStateChange transition);
static GstPad *gst_streamid_demux_get_srcpad_by_stream_id (GstStreamidDemux *
    demux, const gchar * stream_id);
static gboolean gst_streamid_demux_srcpad_create (GstStreamidDemux * demux,
    GstPad * pad, const gchar * stream_id);
static void gst_streamid_demux_reset (GstStreamidDemux * demux);
static void gst_streamid_demux_release_srcpad (const GValue * item,
    GstStreamidDemux * demux);

static void
gst_streamid_demux_class_init (GstStreamidDemuxClass * klass)
{
  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
  GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);

  gobject_class->get_property = gst_streamid_demux_get_property;
  gobject_class->dispose = gst_streamid_demux_dispose;

  g_object_class_install_property (gobject_class, PROP_ACTIVE_PAD,
      g_param_spec_object ("active-pad", "Active pad",
          "The currently active src pad", GST_TYPE_PAD,
          G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));

  gst_element_class_set_static_metadata (gstelement_class, "Streamid Demux",
      "Generic", "1-to-N output stream by stream-id",
      "HoonHee Lee <hoonhee.lee@lge.com>");
  gst_element_class_add_static_pad_template (gstelement_class,
      &gst_streamid_demux_sink_factory);

  gst_element_class_add_static_pad_template (gstelement_class,
      &gst_streamid_demux_src_factory);

  gstelement_class->change_state = gst_streamid_demux_change_state;
}

static void
gst_streamid_demux_init (GstStreamidDemux * demux)
{
  demux->sinkpad =
      gst_pad_new_from_static_template (&gst_streamid_demux_sink_factory,
      "sink");
  gst_pad_set_chain_function (demux->sinkpad,
      GST_DEBUG_FUNCPTR (gst_streamid_demux_chain));
  gst_pad_set_event_function (demux->sinkpad,
      GST_DEBUG_FUNCPTR (gst_streamid_demux_event));

  gst_element_add_pad (GST_ELEMENT (demux), demux->sinkpad);

  /* srcpad management */
  demux->active_srcpad = NULL;
  demux->nb_srcpads = 0;

  /* initialize hash table for srcpad */
  demux->stream_id_pairs =
      g_hash_table_new_full (g_str_hash, g_str_equal, (GDestroyNotify) g_free,
      (GDestroyNotify) gst_object_unref);
}

static void
gst_streamid_demux_dispose (GObject * object)
{
  GstStreamidDemux *demux = GST_STREAMID_DEMUX (object);

  gst_streamid_demux_reset (demux);

  G_OBJECT_CLASS (parent_class)->dispose (object);
}

static void
gst_streamid_demux_get_property (GObject * object, guint prop_id,
    GValue * value, GParamSpec * pspec)
{
  GstStreamidDemux *demux = GST_STREAMID_DEMUX (object);

  switch (prop_id) {
    case PROP_ACTIVE_PAD:
      GST_OBJECT_LOCK (demux);
      g_value_set_object (value, demux->active_srcpad);
      GST_OBJECT_UNLOCK (demux);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static gboolean
forward_sticky_events (GstPad * pad, GstEvent ** event, gpointer user_data)
{
  GstPad *srcpad = GST_PAD_CAST (user_data);

  gst_pad_push_event (srcpad, gst_event_ref (*event));

  return TRUE;
}

static gboolean
gst_streamid_demux_srcpad_create (GstStreamidDemux * demux, GstPad * pad,
    const gchar * stream_id)
{
  gchar *padname = NULL;
  GstPad *srcpad = NULL;
  GstPadTemplate *pad_tmpl = NULL;

  padname = g_strdup_printf ("src_%u", demux->nb_srcpads++);
  pad_tmpl = gst_static_pad_template_get (&gst_streamid_demux_src_factory);

  GST_LOG_OBJECT (demux, "generating a srcpad:%s", padname);
  srcpad = gst_pad_new_from_template (pad_tmpl, padname);
  gst_object_unref (pad_tmpl);
  g_free (padname);
  g_return_val_if_fail (srcpad != NULL, FALSE);

  demux->active_srcpad = srcpad;
  g_hash_table_insert (demux->stream_id_pairs, g_strdup (stream_id),
      gst_object_ref (srcpad));

  return TRUE;
}

static GstFlowReturn
gst_streamid_demux_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
  GstFlowReturn res = GST_FLOW_OK;
  GstStreamidDemux *demux = NULL;
  GstPad *srcpad = NULL;

  demux = GST_STREAMID_DEMUX (parent);

  GST_LOG_OBJECT (demux, "pushing buffer to %" GST_PTR_FORMAT,
      demux->active_srcpad);

  GST_OBJECT_LOCK (demux);
  if (demux->active_srcpad) {
    srcpad = gst_object_ref (demux->active_srcpad);
    GST_OBJECT_UNLOCK (demux);
    res = gst_pad_push (srcpad, buf);
    gst_object_unref (srcpad);
  } else {
    GST_OBJECT_UNLOCK (demux);
    goto no_active_srcpad;
  }

  GST_LOG_OBJECT (demux, "handled buffer %s", gst_flow_get_name (res));
  return res;

/* ERROR */
no_active_srcpad:
  {
    GST_WARNING_OBJECT (demux, "srcpad is not initialized");
    return GST_FLOW_NOT_NEGOTIATED;
  }
}

static GstPad *
gst_streamid_demux_get_srcpad_by_stream_id (GstStreamidDemux * demux,
    const gchar * stream_id)
{
  GstPad *srcpad = NULL;

  GST_DEBUG_OBJECT (demux, "stream_id = %s", stream_id);
  if (demux->stream_id_pairs == NULL || stream_id == NULL) {
    goto done;
  }

  srcpad = g_hash_table_lookup (demux->stream_id_pairs, stream_id);

  if (srcpad) {
    GST_DEBUG_OBJECT (demux, "srcpad = %s:%s matched",
        GST_DEBUG_PAD_NAME (srcpad));
  }

done:
  return srcpad;
}

static gboolean
gst_streamid_demux_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
  gboolean res = TRUE;
  GstStreamidDemux *demux;
  const gchar *stream_id = NULL;
  GstPad *active_srcpad = NULL;

  demux = GST_STREAMID_DEMUX (parent);

  GST_DEBUG_OBJECT (demux, "event = %s, sticky = %d",
      GST_EVENT_TYPE_NAME (event), GST_EVENT_IS_STICKY (event));

  if (GST_EVENT_TYPE (event) == GST_EVENT_STREAM_START) {
    gst_event_parse_stream_start (event, &stream_id);
    if (!stream_id)
      goto no_stream_id;

    GST_OBJECT_LOCK (demux);
    active_srcpad =
        gst_streamid_demux_get_srcpad_by_stream_id (demux, stream_id);
    if (!active_srcpad) {
      /* try to generate a srcpad */
      if (gst_streamid_demux_srcpad_create (demux, pad, stream_id)) {
        GST_OBJECT_UNLOCK (demux);

        gst_pad_set_active (demux->active_srcpad, TRUE);
        /* Forward sticky events to the new srcpad */
        gst_pad_sticky_events_foreach (demux->sinkpad, forward_sticky_events,
            demux->active_srcpad);
        gst_element_add_pad (GST_ELEMENT_CAST (demux), demux->active_srcpad);
      } else {
        GST_OBJECT_UNLOCK (demux);
        goto fail_create_srcpad;
      }
    } else if (demux->active_srcpad != active_srcpad) {
      demux->active_srcpad = active_srcpad;
      GST_OBJECT_UNLOCK (demux);

      g_object_notify (G_OBJECT (demux), "active-pad");
    } else
      GST_OBJECT_UNLOCK (demux);
  }

  if (GST_EVENT_TYPE (event) == GST_EVENT_FLUSH_START
      || GST_EVENT_TYPE (event) == GST_EVENT_FLUSH_STOP
      || GST_EVENT_TYPE (event) == GST_EVENT_EOS) {
    res = gst_pad_event_default (pad, parent, event);
  } else if (demux->active_srcpad) {
    GstPad *srcpad = NULL;
    GST_OBJECT_LOCK (demux);
    srcpad = gst_object_ref (demux->active_srcpad);
    GST_OBJECT_UNLOCK (demux);
    res = gst_pad_push_event (srcpad, event);
    gst_object_unref (srcpad);
  } else {
    gst_event_unref (event);
  }
  return res;

  /* ERRORS */
no_stream_id:
  {
    GST_ELEMENT_ERROR (demux, STREAM, DEMUX,
        ("Error occurred trying to get stream-id to create a srcpad"),
        ("no stream-id found at %s", GST_EVENT_TYPE_NAME (event)));

    gst_event_unref (event);
    return FALSE;
  }

fail_create_srcpad:
  {
    GST_ELEMENT_ERROR (demux, STREAM, FAILED,
        ("Error occurred trying to create a srcpad"),
        ("Failed to create a srcpad via stream-id:%s", stream_id));
    gst_event_unref (event);
    return FALSE;
  }
}

static void
gst_streamid_demux_release_srcpad (const GValue * item,
    GstStreamidDemux * demux)
{
  GstPad *pad = g_value_get_object (item);

  if (pad != NULL) {
    gst_pad_set_active (pad, FALSE);
    gst_element_remove_pad (GST_ELEMENT_CAST (demux), pad);
  }
}

static void
gst_streamid_demux_reset (GstStreamidDemux * demux)
{
  GstIterator *it = NULL;
  GstIteratorResult itret = GST_ITERATOR_OK;

  GST_OBJECT_LOCK (demux);
  if (demux->active_srcpad != NULL)
    demux->active_srcpad = NULL;

  demux->nb_srcpads = 0;
  GST_OBJECT_UNLOCK (demux);

  if (demux->stream_id_pairs != NULL) {
    g_hash_table_unref (demux->stream_id_pairs);
    demux->stream_id_pairs = NULL;
  }

  it = gst_element_iterate_src_pads (GST_ELEMENT_CAST (demux));
  while (itret == GST_ITERATOR_OK || itret == GST_ITERATOR_RESYNC) {
    itret =
        gst_iterator_foreach (it,
        (GstIteratorForeachFunction) gst_streamid_demux_release_srcpad, demux);
    if (itret == GST_ITERATOR_RESYNC)
      gst_iterator_resync (it);
  }
  gst_iterator_free (it);
}

static GstStateChangeReturn
gst_streamid_demux_change_state (GstElement * element,
    GstStateChange transition)
{
  GstStreamidDemux *demux;
  GstStateChangeReturn result;

  demux = GST_STREAMID_DEMUX (element);

  switch (transition) {
    case GST_STATE_CHANGE_READY_TO_PAUSED:
      break;
    default:
      break;
  }

  result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);

  switch (transition) {
    case GST_STATE_CHANGE_PAUSED_TO_READY:
      gst_streamid_demux_reset (demux);
      break;
    default:
      break;
  }

  return result;
}