gstmonoscope.c 16.5 KB
Newer Older
1 2
/* gstmonoscope.c: implementation of monoscope drawing element
 * Copyright (C) <2002> Richard Boulton <richard@tartarus.org>
3 4
 * Copyright (C) <2006> Tim-Philipp Müller <tim centricular net>
 * Copyright (C) <2006> Wim Taymans <wim at fluendo dot com>
5 6 7 8 9 10 11 12 13 14 15 16 17
 *
 * 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
Tim-Philipp Müller's avatar
Tim-Philipp Müller committed
18 19
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, USA.
20 21
 */

22 23
/**
 * SECTION:element-monoscope
24
 * @see_also: goom
25
 *
26 27
 * Monoscope is an audio visualisation element. It creates a coloured
 * curve of the audio signal like on an oscilloscope.
28 29
 *
 * <refsect2>
30
 * <title>Example launch line</title>
31
 * |[
32
 * gst-launch-1.0 -v audiotestsrc ! audioconvert ! monoscope ! videoconvert ! ximagesink
33
 * ]|
34 35 36
 * </refsect2>
 */

37 38 39
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
40

41
#include <gst/video/video.h>
David Schleef's avatar
David Schleef committed
42
#include <gst/audio/audio.h>
43 44
#include <string.h>
#include "gstmonoscope.h"
45 46
#include "monoscope.h"

47
GST_DEBUG_CATEGORY_STATIC (monoscope_debug);
48 49
#define GST_CAT_DEFAULT monoscope_debug

Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
50 51 52
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
    GST_PAD_SRC,
    GST_PAD_ALWAYS,
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
53 54 55 56
#if G_BYTE_ORDER == G_BIG_ENDIAN
    GST_STATIC_CAPS ("video/x-raw, "
        "format = (string) xRGB, "
        "width = 256, " "height = 128, " "framerate = " GST_VIDEO_FPS_RANGE)
57
#else
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
58 59 60
    GST_STATIC_CAPS ("video/x-raw, "
        "format = (string) BGRx, "
        "width = 256, " "height = 128, " "framerate = " GST_VIDEO_FPS_RANGE)
Benjamin Otte's avatar
Benjamin Otte committed
61
#endif
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
62
    );
David Schleef's avatar
David Schleef committed
63

Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
64 65 66
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
    GST_PAD_SINK,
    GST_PAD_ALWAYS,
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
67 68 69 70
    GST_STATIC_CAPS ("audio/x-raw, "
        "format = (string) " GST_AUDIO_NE (S16) ", "
        "rate = (int) [ 8000, 96000 ], "
        "channels = (int) 1, " "layout = (string) interleaved")
Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
71
    );
72 73


Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
74 75
#define gst_monoscope_parent_class parent_class
G_DEFINE_TYPE (GstMonoscope, gst_monoscope, GST_TYPE_ELEMENT);
76

77
static void gst_monoscope_finalize (GObject * object);
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
78 79 80 81 82
static GstFlowReturn gst_monoscope_chain (GstPad * pad, GstObject * parent,
    GstBuffer * buf);
static gboolean gst_monoscope_src_setcaps (GstMonoscope * mono, GstCaps * caps);
static gboolean gst_monoscope_sink_setcaps (GstMonoscope * mono,
    GstCaps * caps);
83
static void gst_monoscope_reset (GstMonoscope * monoscope);
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
84 85 86 87
static gboolean gst_monoscope_sink_event (GstPad * pad, GstObject * parent,
    GstEvent * event);
static gboolean gst_monoscope_src_event (GstPad * pad, GstObject * parent,
    GstEvent * event);
88 89
static GstStateChangeReturn gst_monoscope_change_state (GstElement * element,
    GstStateChange transition);
90 91

static void
Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
92
gst_monoscope_class_init (GstMonoscopeClass * klass)
93 94 95 96
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;

Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
97 98
  gobject_class = (GObjectClass *) klass;
  gstelement_class = (GstElementClass *) klass;
99

100
  gobject_class->finalize = gst_monoscope_finalize;
101

102 103
  gstelement_class->change_state =
      GST_DEBUG_FUNCPTR (gst_monoscope_change_state);
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
104 105 106 107 108

  gst_element_class_add_pad_template (gstelement_class,
      gst_static_pad_template_get (&src_template));
  gst_element_class_add_pad_template (gstelement_class,
      gst_static_pad_template_get (&sink_template));
109
  gst_element_class_set_static_metadata (gstelement_class, "Monoscope",
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
110 111 112
      "Visualization",
      "Displays a highly stabilised waveform of audio input",
      "Richard Boulton <richard@tartarus.org>");
113 114 115
}

static void
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
116
gst_monoscope_init (GstMonoscope * monoscope)
117
{
Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
118
  monoscope->sinkpad =
119 120 121 122 123
      gst_pad_new_from_static_template (&sink_template, "sink");
  gst_pad_set_chain_function (monoscope->sinkpad,
      GST_DEBUG_FUNCPTR (gst_monoscope_chain));
  gst_pad_set_event_function (monoscope->sinkpad,
      GST_DEBUG_FUNCPTR (gst_monoscope_sink_event));
124 125
  gst_element_add_pad (GST_ELEMENT (monoscope), monoscope->sinkpad);

126 127 128 129
  monoscope->srcpad = gst_pad_new_from_static_template (&src_template, "src");
  gst_pad_set_event_function (monoscope->srcpad,
      GST_DEBUG_FUNCPTR (gst_monoscope_src_event));
  gst_element_add_pad (GST_ELEMENT (monoscope), monoscope->srcpad);
130

131 132 133
  monoscope->adapter = gst_adapter_new ();
  monoscope->next_ts = GST_CLOCK_TIME_NONE;
  monoscope->bps = sizeof (gint16);
134

135
  /* reset the initial video state */
136 137
  monoscope->width = 256;
  monoscope->height = 128;
138 139 140
  monoscope->fps_num = 25;      /* desired frame rate */
  monoscope->fps_denom = 1;
  monoscope->visstate = NULL;
141 142 143

  /* reset the initial audio state */
  monoscope->rate = GST_AUDIO_DEF_RATE;
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
}

static void
gst_monoscope_finalize (GObject * object)
{
  GstMonoscope *monoscope = GST_MONOSCOPE (object);

  if (monoscope->visstate)
    monoscope_close (monoscope->visstate);

  g_object_unref (monoscope->adapter);

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

static void
gst_monoscope_reset (GstMonoscope * monoscope)
{
  monoscope->next_ts = GST_CLOCK_TIME_NONE;

  gst_adapter_clear (monoscope->adapter);
  gst_segment_init (&monoscope->segment, GST_FORMAT_UNDEFINED);

  GST_OBJECT_LOCK (monoscope);
  monoscope->proportion = 1.0;
  monoscope->earliest_time = -1;
  GST_OBJECT_UNLOCK (monoscope);
}

static gboolean
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
174
gst_monoscope_sink_setcaps (GstMonoscope * monoscope, GstCaps * caps)
175 176 177 178 179 180 181 182 183
{
  GstStructure *structure;

  structure = gst_caps_get_structure (caps, 0);

  gst_structure_get_int (structure, "rate", &monoscope->rate);

  GST_DEBUG_OBJECT (monoscope, "sample rate = %d", monoscope->rate);
  return TRUE;
184 185
}

186
static gboolean
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
187
gst_monoscope_src_setcaps (GstMonoscope * monoscope, GstCaps * caps)
188
{
David Schleef's avatar
David Schleef committed
189
  GstStructure *structure;
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
190
  gboolean res;
191

David Schleef's avatar
David Schleef committed
192 193 194 195
  structure = gst_caps_get_structure (caps, 0);

  gst_structure_get_int (structure, "width", &monoscope->width);
  gst_structure_get_int (structure, "height", &monoscope->height);
196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213
  gst_structure_get_fraction (structure, "framerate", &monoscope->fps_num,
      &monoscope->fps_denom);

  monoscope->outsize = monoscope->width * monoscope->height * 4;
  monoscope->frame_duration = gst_util_uint64_scale_int (GST_SECOND,
      monoscope->fps_denom, monoscope->fps_num);
  monoscope->spf =
      gst_util_uint64_scale_int (monoscope->rate, monoscope->fps_denom,
      monoscope->fps_num);

  GST_DEBUG_OBJECT (monoscope, "dimension %dx%d, framerate %d/%d, spf %d",
      monoscope->width, monoscope->height, monoscope->fps_num,
      monoscope->fps_denom, monoscope->spf);

  if (monoscope->visstate) {
    monoscope_close (monoscope->visstate);
    monoscope->visstate = NULL;
  }
214

215
  monoscope->visstate = monoscope_init (monoscope->width, monoscope->height);
216

217
  res = gst_pad_set_caps (monoscope->srcpad, caps);
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
218 219

  return res && (monoscope->visstate != NULL);
220 221
}

222 223
static gboolean
gst_monoscope_src_negotiate (GstMonoscope * monoscope)
224
{
225
  GstCaps *othercaps, *target;
226
  GstStructure *structure;
Wim Taymans's avatar
Wim Taymans committed
227
  GstCaps *templ;
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
228
  GstQuery *query;
229 230 231
  GstBufferPool *pool;
  GstStructure *config;
  guint size, min, max;
232

233
  templ = gst_pad_get_pad_template_caps (monoscope->srcpad);
234

235
  GST_DEBUG_OBJECT (monoscope, "performing negotiation");
236

237
  /* see what the peer can do */
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
238
  othercaps = gst_pad_peer_query_caps (monoscope->srcpad, NULL);
239
  if (othercaps) {
240
    target = gst_caps_intersect (othercaps, templ);
241
    gst_caps_unref (othercaps);
Wim Taymans's avatar
Wim Taymans committed
242
    gst_caps_unref (templ);
243

244
    if (gst_caps_is_empty (target))
245 246
      goto no_format;

Wim Taymans's avatar
Wim Taymans committed
247
    target = gst_caps_truncate (target);
248
  } else {
Wim Taymans's avatar
Wim Taymans committed
249
    target = templ;
250 251
  }

Wim Taymans's avatar
Wim Taymans committed
252
  target = gst_caps_make_writable (target);
253 254 255 256 257
  structure = gst_caps_get_structure (target, 0);
  gst_structure_fixate_field_nearest_int (structure, "width", 320);
  gst_structure_fixate_field_nearest_int (structure, "height", 240);
  gst_structure_fixate_field_nearest_fraction (structure, "framerate", 25, 1);

Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
258 259 260 261 262 263
  gst_monoscope_src_setcaps (monoscope, target);

  /* try to get a bufferpool now */
  /* find a pool for the negotiated caps now */
  query = gst_query_new_allocation (target, TRUE);

264 265 266 267
  if (!gst_pad_peer_query (monoscope->srcpad, query)) {
  }

  if (gst_query_get_n_allocation_pools (query) > 0) {
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
268
    /* we got configuration from our peer, parse them */
269
    gst_query_parse_nth_allocation_pool (query, 0, &pool, &size, &min, &max);
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
270
  } else {
271
    pool = NULL;
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
272 273 274 275 276 277 278 279 280
    size = monoscope->outsize;
    min = max = 0;
  }

  if (pool == NULL) {
    /* we did not get a pool, make one ourselves then */
    pool = gst_buffer_pool_new ();
  }

281
  config = gst_buffer_pool_get_config (pool);
Wim Taymans's avatar
Wim Taymans committed
282
  gst_buffer_pool_config_set_params (config, target, size, min, max);
283 284 285 286
  gst_buffer_pool_set_config (pool, config);

  if (monoscope->pool) {
    gst_buffer_pool_set_active (monoscope->pool, TRUE);
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
287
    gst_object_unref (monoscope->pool);
288
  }
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
289 290 291 292 293
  monoscope->pool = pool;

  /* and activate */
  gst_buffer_pool_set_active (pool, TRUE);

294 295 296 297 298 299
  gst_caps_unref (target);

  return TRUE;

no_format:
  {
300
    gst_caps_unref (target);
301 302 303
    return FALSE;
  }
}
304

Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
305
/* make sure we are negotiated */
306
static GstFlowReturn
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
307
ensure_negotiated (GstMonoscope * monoscope)
308
{
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
309
  gboolean reconfigure;
310

Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
311 312 313 314
  reconfigure = gst_pad_check_reconfigure (monoscope->srcpad);

  /* we don't know an output format yet, pick one */
  if (reconfigure || !gst_pad_has_current_caps (monoscope->srcpad)) {
315 316
    if (!gst_monoscope_src_negotiate (monoscope))
      return GST_FLOW_NOT_NEGOTIATED;
317
  }
318 319 320 321
  return GST_FLOW_OK;
}

static GstFlowReturn
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
322
gst_monoscope_chain (GstPad * pad, GstObject * parent, GstBuffer * inbuf)
323
{
324
  GstFlowReturn flow_ret = GST_FLOW_OK;
325 326
  GstMonoscope *monoscope;

Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
327 328 329 330 331 332 333 334 335 336 337 338 339 340
  monoscope = GST_MONOSCOPE (parent);

  if (monoscope->rate == 0) {
    gst_buffer_unref (inbuf);
    flow_ret = GST_FLOW_NOT_NEGOTIATED;
    goto out;
  }

  /* Make sure have an output format */
  flow_ret = ensure_negotiated (monoscope);
  if (flow_ret != GST_FLOW_OK) {
    gst_buffer_unref (inbuf);
    goto out;
  }
341 342 343 344 345

  /* don't try to combine samples from discont buffer */
  if (GST_BUFFER_FLAG_IS_SET (inbuf, GST_BUFFER_FLAG_DISCONT)) {
    gst_adapter_clear (monoscope->adapter);
    monoscope->next_ts = GST_CLOCK_TIME_NONE;
346 347
  }

348 349 350 351
  /* Match timestamps from the incoming audio */
  if (GST_BUFFER_TIMESTAMP (inbuf) != GST_CLOCK_TIME_NONE)
    monoscope->next_ts = GST_BUFFER_TIMESTAMP (inbuf);

352 353
  GST_LOG_OBJECT (monoscope,
      "in buffer has %" G_GSIZE_FORMAT " samples, ts=%" GST_TIME_FORMAT,
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
354
      gst_buffer_get_size (inbuf) / monoscope->bps,
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
      GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (inbuf)));

  gst_adapter_push (monoscope->adapter, inbuf);
  inbuf = NULL;

  /* Collect samples until we have enough for an output frame */
  while (flow_ret == GST_FLOW_OK) {
    gint16 *samples;
    GstBuffer *outbuf = NULL;
    guint32 *pixels, avail, bytesperframe;

    avail = gst_adapter_available (monoscope->adapter);
    GST_LOG_OBJECT (monoscope, "bytes avail now %u", avail);

    bytesperframe = monoscope->spf * monoscope->bps;
    if (avail < bytesperframe)
      break;

    /* FIXME: something is wrong with QoS, we are skipping way too much
     * stuff even with very low CPU loads */
#if 0
    if (monoscope->next_ts != -1) {
      gboolean need_skip;
      gint64 qostime;

      qostime = gst_segment_to_running_time (&monoscope->segment,
          GST_FORMAT_TIME, monoscope->next_ts);

      GST_OBJECT_LOCK (monoscope);
      /* check for QoS, don't compute buffers that are known to be late */
      need_skip =
          GST_CLOCK_TIME_IS_VALID (monoscope->earliest_time) &&
          qostime <= monoscope->earliest_time;
      GST_OBJECT_UNLOCK (monoscope);

      if (need_skip) {
        GST_WARNING_OBJECT (monoscope,
            "QoS: skip ts: %" GST_TIME_FORMAT ", earliest: %" GST_TIME_FORMAT,
            GST_TIME_ARGS (qostime), GST_TIME_ARGS (monoscope->earliest_time));
        goto skip;
      }
    }
#endif

Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
399
    samples = (gint16 *) gst_adapter_map (monoscope->adapter, bytesperframe);
400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415

    if (monoscope->spf < 512) {
      gint16 in_data[512], i;

      for (i = 0; i < 512; ++i) {
        gdouble off;

        off = ((gdouble) i * (gdouble) monoscope->spf) / 512.0;
        in_data[i] = samples[MIN ((guint) off, monoscope->spf)];
      }
      pixels = monoscope_update (monoscope->visstate, in_data);
    } else {
      /* not really correct, but looks much prettier */
      pixels = monoscope_update (monoscope->visstate, samples);
    }

Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
416 417 418 419
    GST_LOG_OBJECT (monoscope, "allocating output buffer");
    flow_ret = gst_buffer_pool_acquire_buffer (monoscope->pool, &outbuf, NULL);
    if (flow_ret != GST_FLOW_OK) {
      gst_adapter_unmap (monoscope->adapter);
420
      goto out;
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
421
    }
422

Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
423
    gst_buffer_fill (outbuf, 0, pixels, monoscope->outsize);
424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445

    GST_BUFFER_TIMESTAMP (outbuf) = monoscope->next_ts;
    GST_BUFFER_DURATION (outbuf) = monoscope->frame_duration;

    flow_ret = gst_pad_push (monoscope->srcpad, outbuf);

#if 0
  skip:
#endif

    if (GST_CLOCK_TIME_IS_VALID (monoscope->next_ts))
      monoscope->next_ts += monoscope->frame_duration;

    gst_adapter_flush (monoscope->adapter, bytesperframe);
  }

out:

  return flow_ret;
}

static gboolean
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
446
gst_monoscope_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
447 448 449 450
{
  GstMonoscope *monoscope;
  gboolean res;

Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
451
  monoscope = GST_MONOSCOPE (parent);
452 453 454 455 456 457 458 459 460

  switch (GST_EVENT_TYPE (event)) {
    case GST_EVENT_FLUSH_START:
      res = gst_pad_push_event (monoscope->srcpad, event);
      break;
    case GST_EVENT_FLUSH_STOP:
      gst_monoscope_reset (monoscope);
      res = gst_pad_push_event (monoscope->srcpad, event);
      break;
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
461
    case GST_EVENT_SEGMENT:
462 463 464 465
    {
      /* the newsegment values are used to clip the input samples
       * and to convert the incomming timestamps to running time so
       * we can do QoS */
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
466
      gst_event_copy_segment (event, &monoscope->segment);
467 468 469

      res = gst_pad_push_event (monoscope->srcpad, event);
      break;
470
    }
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
471 472 473 474 475 476 477 478 479 480
    case GST_EVENT_CAPS:
    {
      GstCaps *caps;

      gst_event_parse_caps (event, &caps);
      gst_monoscope_sink_setcaps (monoscope, caps);
      gst_event_unref (event);
      res = TRUE;
      break;
    }
481 482 483
    default:
      res = gst_pad_push_event (monoscope->srcpad, event);
      break;
484 485
  }

486 487
  return res;
}
488

489
static gboolean
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
490
gst_monoscope_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
491 492 493
{
  GstMonoscope *monoscope;
  gboolean res;
494

Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
495
  monoscope = GST_MONOSCOPE (parent);
496

497 498 499 500 501 502
  switch (GST_EVENT_TYPE (event)) {
    case GST_EVENT_QOS:{
      gdouble proportion;
      GstClockTimeDiff diff;
      GstClockTime timestamp;

Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
503
      gst_event_parse_qos (event, NULL, &proportion, &diff, &timestamp);
504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523

      /* save stuff for the _chain() function */
      GST_OBJECT_LOCK (monoscope);
      monoscope->proportion = proportion;
      if (diff >= 0)
        /* we're late, this is a good estimate for next displayable
         * frame (see part-qos.txt) */
        monoscope->earliest_time =
            timestamp + 2 * diff + monoscope->frame_duration;
      else
        monoscope->earliest_time = timestamp + diff;
      GST_OBJECT_UNLOCK (monoscope);

      res = gst_pad_push_event (monoscope->sinkpad, event);
      break;
    }
    default:
      res = gst_pad_push_event (monoscope->sinkpad, event);
      break;
  }
524

525 526
  return res;
}
527

528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547
static GstStateChangeReturn
gst_monoscope_change_state (GstElement * element, GstStateChange transition)
{
  GstMonoscope *monoscope = GST_MONOSCOPE (element);
  GstStateChangeReturn ret;

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

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

  switch (transition) {
    case GST_STATE_CHANGE_PAUSED_TO_READY:
Mark Nauwelaerts's avatar
Mark Nauwelaerts committed
548 549 550 551
      if (monoscope->pool) {
        gst_buffer_pool_set_active (monoscope->pool, FALSE);
        gst_object_replace ((GstObject **) & monoscope->pool, NULL);
      }
552 553 554 555 556 557 558 559
      break;
    case GST_STATE_CHANGE_READY_TO_NULL:
      break;
    default:
      break;
  }

  return ret;
560 561 562
}

static gboolean
Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
563
plugin_init (GstPlugin * plugin)
564
{
565 566 567
  GST_DEBUG_CATEGORY_INIT (monoscope_debug, "monoscope", 0,
      "monoscope element");

Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
568 569
  return gst_element_register (plugin, "monoscope",
      GST_RANK_NONE, GST_TYPE_MONOSCOPE);
570 571
}

Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
572 573
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
    GST_VERSION_MINOR,
574
    monoscope,
Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
575
    "Monoscope visualization",
576
    plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN);