summaryrefslogtreecommitdiffstats
path: root/examples/dynparams/filter.c
blob: 333820df1fd82b5ff8d14979ffbdc4168e675688 (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
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
/*
 * filter.c
 *
 * demo application for filters using dparams
 * dparams get their sliders which you can play with
 *
 * you can also enter an input and output part of a pipeline
 */

#include <string.h>
#include <gtk/gtk.h>
#include <gst/gst.h>
#include <gst/control/control.h>

/* filter UI data */
struct _filter_ui
{
  GtkWidget *window;            /* top-level interface window */

  GtkWidget *buttons;           /* all of the control buttons */
  GtkWidget *parse, *play, *stop;       /* control buttons */

  GtkWidget *feedback;          /* here's where we'll tell you stuff */
  GtkTextBuffer *fb_buffer;     /* feedback buffer */
  GtkWidget *selection;         /* the place to input element stuff */
  GtkWidget *input, *filter, *output;   /* the selection widgets */

  GtkWidget *control;           /* the dynamically generated control UI */
};

typedef struct _filter_ui _filter_ui_t;

/* back-end data */
struct _filter_data
{
  _filter_ui_t *ui;             /* the UI data */
  gchar *input_pipe, *output_pipe, *filter_element;
  gchar *pipe_string;
  GList *filter_choices;

  gboolean playing;
  GstElement *input, *output;   /* these are in and out bins */
  GstElement *pipeline;
  GstElement *filter;
};

typedef struct _filter_data _filter_data_t;

/* internal prototypes when they can't be avoided */
void cb_remove_and_destroy (GtkWidget * widget, gpointer user_data);

//void  cb_dynparm_value_changed (GtkWidget *widget, gpointer user_data);
void cb_dynparm_value_changed (GtkRange * range, GstDParam * dparam);

/* GStreamer helper functions go here */

/* go through a bin, finding the one pad that is unconnected in the given
 * direction, and return a ghost pad */
GstPad *
gst_bin_find_unconnected_pad (GstBin * bin, GstPadDirection direction,
    gchar * name)
{
  GstPad *pad = NULL;
  GList *elements = NULL;
  const GList *pads = NULL;
  GstElement *element = NULL;

  g_print ("DEBUG: find_unconnected start\n");
  elements = (GList *) gst_bin_get_list (bin);
  /* traverse all elements looking for unconnected pads */
  while (elements && pad == NULL) {
    element = GST_ELEMENT (elements->data);
    g_print ("DEBUG: looking in element %s\n", gst_element_get_name (element));
    pads = gst_element_get_pad_list (element);
    while (pads) {
      /* check if the direction matches */
      if (GST_PAD_DIRECTION (GST_PAD (pads->data)) == direction) {
        if (GST_PAD_PEER (GST_PAD (pads->data)) == NULL) {
          /* found it ! */
          g_print ("DEBUG: found an unconnected pad !\n");
          pad = GST_PAD (pads->data);
        }
      }
      if (pad)
        break;                  /* found one already */
      pads = g_list_next (pads);
    }
    elements = g_list_next (elements);
  }

  g_print ("DEBUG: find_unconnected stop\n");
  if (pad == NULL)              /* we didn't find it at all */
    return NULL;

  pad = gst_ghost_pad_new (name, pad);
  return pad;
}

void
ui_feedback_add_text (_filter_ui_t * ui, const gchar * text)
{
  GtkTextIter iter;

  gtk_text_buffer_get_end_iter (ui->fb_buffer, &iter);
  gtk_text_buffer_insert (ui->fb_buffer, &iter, text, -1);
}

void
ui_feedback_add (_filter_ui_t * ui, const gchar * format, ...)
{
  va_list args;
  gchar *buffer = NULL;

  va_start (args, format);
  buffer = g_strdup_vprintf (format, args);
  va_end (args);
  ui_feedback_add_text (ui, buffer);
  g_free (buffer);
}

void
ui_feedback_clear (_filter_ui_t * ui)
{
  gtk_text_buffer_set_text (ui->fb_buffer, "", 0);
}

/* create the control widget using the element's dynparams 
 * control is a vbox which we need to empty first */
void
ui_control_create (GstElement * element, GtkWidget * control, _filter_ui_t * ui)
{
  GtkWidget *hbox = NULL;
  GtkWidget *widget = NULL;
  GstDParamManager *dpman = NULL;
  GstDParam *dparam = NULL;
  GParamSpec **specs = NULL;
  int i = 0;

  g_assert (GTK_IS_VBOX (control));

  /* empty control vbox */
  g_print ("DEBUG: emptying control widget\n");
  gtk_container_foreach (GTK_CONTAINER (control), cb_remove_and_destroy,
      (gpointer) control);

  g_print ("DEBUG: adding label to control widget\n");
  widget = gtk_label_new ("Dynamic Parameters");
  gtk_container_add (GTK_CONTAINER (control), widget);
  gtk_widget_show (widget);

  if ((dpman = gst_dpman_get_manager (element))) {
    ui_feedback_add (ui, "Found Dynamic Parameters on filter element.\n");
    specs = gst_dpman_list_dparam_specs (dpman);
    for (i = 0; specs[i] != NULL; ++i) {
      hbox = gtk_hbox_new (FALSE, 0);
      widget = gtk_label_new (g_param_spec_get_name (specs[i]));
      gtk_container_add (GTK_CONTAINER (hbox), widget);
      gtk_widget_show (widget);
      switch (G_PARAM_SPEC_VALUE_TYPE (specs[i])) {
        case G_TYPE_INT64:
          widget = gtk_hscale_new_with_range (
              (gdouble) (((GParamSpecInt64 *) specs[i])->minimum),
              (gdouble) (((GParamSpecInt64 *) specs[i])->maximum), 1.0);
          gtk_range_set_value (GTK_RANGE (widget),
              (gdouble) ((GParamSpecInt64 *) specs[i])->default_value);
          break;

        case G_TYPE_INT:
          widget = gtk_hscale_new_with_range (
              (gdouble) (((GParamSpecInt *) specs[i])->minimum),
              (gdouble) (((GParamSpecInt *) specs[i])->maximum), 1.0);
          gtk_range_set_value (GTK_RANGE (widget),
              (gdouble) ((GParamSpecInt *) specs[i])->default_value);
          break;
        case G_TYPE_FLOAT:
          widget = gtk_hscale_new_with_range (
              (gdouble) (((GParamSpecFloat *) specs[i])->minimum),
              (gdouble) (((GParamSpecFloat *) specs[i])->maximum), 0.00001);
          gtk_range_set_value (GTK_RANGE (widget),
              (gdouble) ((GParamSpecFloat *) specs[i])->default_value);
          break;
      }
      /* create the dparam object */
      dparam = gst_dpsmooth_new (G_PARAM_SPEC_VALUE_TYPE (specs[i]));
      g_object_set (G_OBJECT (dparam), "update_period", 2000000LL, NULL);
      if (!gst_dpman_attach_dparam (dpman,
              (gchar *) g_param_spec_get_name (specs[i]), dparam))
        g_assert_not_reached ();
      gst_dpman_set_mode (dpman, "asynchronous");
      g_signal_connect (widget, "value-changed",
          G_CALLBACK (cb_dynparm_value_changed), dparam);
      cb_dynparm_value_changed (GTK_RANGE (widget), dparam);

      gtk_container_add (GTK_CONTAINER (hbox), widget);
      gtk_widget_show (widget);
    }
    gtk_container_add (GTK_CONTAINER (control), hbox);
    gtk_widget_show (hbox);
  }
}

/* all the pretty callbacks gather here please */
void
cb_remove_and_destroy (GtkWidget * widget, gpointer user_data)
{
  GtkContainer *container = GTK_CONTAINER (user_data);

  g_print ("DEBUG: trying to remove widget from a container.\n");
  gtk_container_remove (container, widget);
  gtk_widget_destroy (widget);
}

/* when the scale associated with a dparam changes, respond */
void
cb_dynparm_value_changed (GtkRange * range, GstDParam * dparam)
{
  /*
     GstDParam *dparam = GST_DPARAM (user_data);
     GtkHScale *adj = GTK_HSCALE (widget);
   */
  gdouble value = 0.0;

  g_assert (GST_IS_DPARAM (dparam));
  g_assert (GTK_IS_RANGE (range));

  value = gtk_range_get_value (range);

  g_print ("DEBUG: setting value to %f\n", value);

  switch (G_PARAM_SPEC_VALUE_TYPE (GST_DPARAM_PARAM_SPEC (dparam))) {
    case G_TYPE_INT64:
      g_object_set (G_OBJECT (dparam), "value_int64", (gint64) value, NULL);
      break;

    case G_TYPE_INT:
      g_object_set (G_OBJECT (dparam), "value_int", (gint) value, NULL);
      break;

    case G_TYPE_FLOAT:
      g_object_set (G_OBJECT (dparam), "value_float", (gfloat) value, NULL);
      break;
  }
}


void
cb_entry_activate (GtkEntry * entry, gpointer user_data)
{
  g_print ("DEBUG: oi ! you activated an entry !\n");
  g_print ("DEBUG: pipeline: %s\n", gtk_entry_get_text (entry));
}

void
cb_play_clicked (GtkButton * button, gpointer * user_data)
{
  _filter_data_t *fd = (_filter_data_t *) user_data;

  g_return_if_fail (GST_IS_PIPELINE (fd->pipeline));
  if (GST_STATE (fd->pipeline) == GST_STATE_PLAYING) {
    ui_feedback_add (fd->ui, "Pipeline is already playing !\n");
    return;
  }
  gst_element_set_state (fd->pipeline, GST_STATE_PLAYING);
}

void
cb_stop_clicked (GtkButton * button, gpointer * user_data)
{
  _filter_data_t *fd = (_filter_data_t *) user_data;

  if (GST_STATE (fd->pipeline) != GST_STATE_PLAYING) {
    ui_feedback_add (fd->ui, "Pipeline is not playing !\n");
    return;
  }
  gst_element_set_state (fd->pipeline, GST_STATE_NULL);
}

void
cb_parse_clicked (GtkButton * button, gpointer * user_data)
{
  _filter_data_t *fd = (_filter_data_t *) user_data;
  GtkCombo *filter = GTK_COMBO (fd->ui->filter);
  GError *error = NULL;
  GstPad *src_pad, *sink_pad;

  g_print ("DEBUG: you pressed parse.\n");
  ui_feedback_clear (fd->ui);
  ui_feedback_add (fd->ui, "Parsing pipeline ...\n");
  if (fd->input_pipe)
    g_free (fd->input_pipe);
  if (fd->output_pipe)
    g_free (fd->output_pipe);
  if (fd->filter_element)
    g_free (fd->filter_element);
  fd->input_pipe = g_strdup_printf ("bin.( %s )",
      gtk_entry_get_text (GTK_ENTRY (fd->ui->input)));
  fd->output_pipe = g_strdup_printf ("bin.( %s )",
      gtk_entry_get_text (GTK_ENTRY (fd->ui->output)));
  /* gtkcombo.h says I can access the entry field directly */
  fd->filter_element =
      g_strdup (gtk_entry_get_text (GTK_ENTRY (filter->entry)));
  g_print ("Input pipeline :\t%s (%d)\n", fd->input_pipe,
      (int) strlen (fd->input_pipe));
  g_print ("Filter element :\t%s (%d)\n", fd->filter_element,
      (int) strlen (fd->filter_element));
  g_print ("Output pipeline :\t%s (%d)\n", fd->output_pipe,
      (int) strlen (fd->output_pipe));

  /* try to create in and out bins */
  if (strlen (fd->input_pipe) == 0) {
    ui_feedback_add (fd->ui, "Error : try setting an input pipe.\n");
    return;
  }
  if (fd->input)
    gst_object_unref (GST_OBJECT (fd->input));
  fd->input = GST_ELEMENT (gst_parse_launch (fd->input_pipe, &error));
  if (error) {
    ui_feedback_add (fd->ui, "Error : parsing input pipeline : %s\n",
        error->message);
    g_error_free (error);
    return;
  }

  if (strlen (fd->output_pipe) == 0) {
    ui_feedback_add (fd->ui, "Error : try setting an output pipe.\n");
    return;
  }
  if (fd->output)
    gst_object_unref (GST_OBJECT (fd->output));
  fd->output = GST_ELEMENT (gst_parse_launch (fd->output_pipe, &error));
  if (error) {
    ui_feedback_add (fd->ui, "Error : parsing output pipeline : %s\n",
        error->message);
    g_error_free (error);
    return;
  }

  /* try to create filter */
  if (fd->filter)
    gst_object_unref (GST_OBJECT (fd->filter));
  fd->filter = gst_element_factory_make (fd->filter_element, "filter");
  if (fd->filter == NULL) {
    ui_feedback_add (fd->ui, "Error : could not create element %s\n",
        fd->filter_element);
    return;
  }

  /* set up dynparam controls for filter */
  ui_control_create (fd->filter, fd->ui->control, fd->ui);

  /* create toplevel bin */
  fd->pipeline = gst_thread_new ("toplevel");

  /* add the players to it */
  gst_bin_add_many (GST_BIN (fd->pipeline),
      fd->input, fd->filter, fd->output, NULL);

  /* connect filter to input and output bin */
  src_pad = gst_bin_find_unconnected_pad (GST_BIN (fd->input), GST_PAD_SRC,
      "source");
  if (src_pad == NULL) {
    ui_feedback_add (fd->ui,
        "Error : could not find an unconnected source pad !\n");
    return;
  }
  sink_pad = gst_bin_find_unconnected_pad (GST_BIN (fd->output), GST_PAD_SINK,
      "sink");
  if (sink_pad == NULL) {
    ui_feedback_add (fd->ui,
        "Error : could not find an unconnected sink pad !\n");
    return;
  }
  gst_element_add_pad (fd->input, src_pad);
  gst_element_add_pad (fd->output, sink_pad);

  gst_element_link_many (fd->input, fd->filter, fd->output, NULL);

  if (fd->pipe_string)
    g_free (fd->pipe_string);
  fd->pipe_string = g_strdup_printf ("%s ! %s ! %s", fd->input_pipe,
      fd->filter_element, fd->output_pipe);
  g_print ("Pipeline : %s\n", fd->pipe_string);
  ui_feedback_add (fd->ui, "Complete parsed pipeline: %s\n", fd->pipe_string);


}

/* find out the list of choices for GStreamer filters */
GList *
get_filter_choices (void)
{
  GList *choices = NULL;

  choices = g_list_append (choices, "volume");
  choices = g_list_append (choices, "ladspa_lpf");
  choices = g_list_append (choices, "ladspa_hpf");

  return choices;
}

void
init_data (_filter_data_t * fd)
{
  fd->input_pipe = NULL;
  fd->output_pipe = NULL;
  fd->filter_element = NULL;
  fd->pipe_string = NULL;
  fd->filter_choices = get_filter_choices ();

  /* GStreamer stuff */
  fd->input = NULL;
  fd->output = NULL;
  fd->filter = NULL;
  fd->pipeline = NULL;
  fd->playing = FALSE;
}

void
create_ui (_filter_ui_t * fui, _filter_data_t * fd)
{
  GtkWidget *widget;            /* temporary widget */
  GtkWidget *vbox;              /* temporary vbox */

  g_print ("DEBUG: creating top-level window\n");
  fui->window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  widget = gtk_vbox_new (FALSE, 0);
  gtk_container_add (GTK_CONTAINER (fui->window), widget);
  gtk_window_set_title (GTK_WINDOW (fui->window), "Gee, I can set titles too");

  /* top level window division */
  g_print ("DEBUG: creating top-level window contents\n");
  fui->buttons = gtk_hbox_new (FALSE, 0);
  gtk_container_add (GTK_CONTAINER (widget), fui->buttons);
  fui->feedback = gtk_text_view_new ();
  gtk_container_add (GTK_CONTAINER (widget), fui->feedback);
  fui->selection = gtk_hbox_new (FALSE, 0);
  gtk_container_add (GTK_CONTAINER (widget), fui->selection);
  fui->control = gtk_vbox_new (TRUE, 5);
  gtk_container_add (GTK_CONTAINER (widget), fui->control);

  /* button widget */
  fui->parse = gtk_button_new_with_label ("Parse");
  gtk_container_add (GTK_CONTAINER (fui->buttons), fui->parse);
  g_signal_connect (G_OBJECT (fui->parse), "clicked",
      G_CALLBACK (cb_parse_clicked), fd);
  fui->play = gtk_button_new_with_label ("Play");
  gtk_container_add (GTK_CONTAINER (fui->buttons), fui->play);
  g_signal_connect (G_OBJECT (fui->play), "clicked",
      G_CALLBACK (cb_play_clicked), fd);
  fui->stop = gtk_button_new_with_label ("Stop");
  gtk_container_add (GTK_CONTAINER (fui->buttons), fui->stop);
  g_signal_connect (G_OBJECT (fui->stop), "clicked",
      G_CALLBACK (cb_stop_clicked), fd);

  /* feedback widget */
  fui->fb_buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (fui->feedback));
  gtk_text_buffer_set_text (fui->fb_buffer,
      "Hello, and welcome to the GStreamer filter demo app !\n"
      "I'll be your feedback window for today.\n", -1);

  /* selection widget */
  vbox = gtk_vbox_new (FALSE, 0);
  widget = gtk_label_new ("Input Pipe");
  gtk_container_add (GTK_CONTAINER (vbox), widget);
  fui->input = gtk_entry_new ();
  gtk_entry_set_text (GTK_ENTRY (fui->input), "sinesrc");
  gtk_container_add (GTK_CONTAINER (vbox), fui->input);
  gtk_container_add (GTK_CONTAINER (fui->selection), vbox);
  g_signal_connect (G_OBJECT (fui->input), "activate",
      G_CALLBACK (cb_entry_activate), NULL);

  vbox = gtk_vbox_new (FALSE, 0);
  widget = gtk_label_new ("Filter");
  gtk_container_add (GTK_CONTAINER (vbox), widget);
  fui->filter = gtk_combo_new ();
  gtk_combo_set_popdown_strings (GTK_COMBO (fui->filter), fd->filter_choices);
  gtk_container_add (GTK_CONTAINER (vbox), fui->filter);
  gtk_container_add (GTK_CONTAINER (fui->selection), vbox);

  vbox = gtk_vbox_new (FALSE, 0);
  widget = gtk_label_new ("Output Pipe");
  gtk_container_add (GTK_CONTAINER (vbox), widget);
  fui->output = gtk_entry_new ();
  gtk_entry_set_text (GTK_ENTRY (fui->output), "osssink fragment=1572872");     /* fixme: gconf default ? */
  gtk_container_add (GTK_CONTAINER (vbox), fui->output);
  gtk_container_add (GTK_CONTAINER (fui->selection), vbox);
  g_signal_connect (G_OBJECT (fui->output), "activate",
      G_CALLBACK (cb_entry_activate), NULL);

  /* control widget is dynamically generated */
  /*
     g_print ("DEBUG: labeling control area.\n");
     widget = gtk_label_new ("This is the big control area.");
     gtk_container_add (GTK_CONTAINER (fui->control), widget);
   */
}


int
main (int argc, char *argv[])
{
  _filter_data_t filter_data;
  _filter_ui_t filter_ui;


  gtk_init (&argc, &argv);
  gst_init (&argc, &argv);
  gst_control_init (&argc, &argv);

  init_data (&filter_data);
  filter_data.ui = &filter_ui;

  create_ui (&filter_ui, &filter_data);
  gtk_widget_show_all (filter_ui.window);

  gtk_main ();

  return 0;
}