summaryrefslogtreecommitdiffstats
path: root/gst/audiofx/audioamplify.c
blob: ce4a0042bcffe9b4aa80c24e5f9f2853d2f7c5e9 (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
/* 
 * GStreamer
 * Copyright (C) 2007 Sebastian Dröge <slomo@circular-chaos.org>
 * Copyright (C) 2006 Stefan Kost <ensonic@users.sf.net>
 *
 * 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-audioamplify
 * @short_description: Amplifies an audio stream with selectable clipping mode
 *
 * <refsect2>
 * Amplifies an audio stream by a given factor and allows the selection of different clipping modes.
 * The difference between the clipping modes is best evaluated by testing.
 * <title>Example launch line</title>
 * <para>
 * <programlisting>
 * gst-launch audiotestsrc wave=saw ! audioamplify amplification=1.5 ! alsasink
 * gst-launch filesrc location="melo1.ogg" ! oggdemux ! vorbisdec ! audioconvert ! audioamplify amplification=1.5 method=wrap-negative ! alsasink
 * gst-launch audiotestsrc wave=saw ! audioconvert ! audioamplify amplification=1.5 method=wrap-positive ! audioconvert ! alsasink
 * </programlisting>
 * </para>
 * </refsect2>
 */

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

#include <gst/gst.h>
#include <gst/base/gstbasetransform.h>
#include <gst/audio/audio.h>
#include <gst/audio/gstaudiofilter.h>
#include <gst/controller/gstcontroller.h>

#include "audioamplify.h"

#define GST_CAT_DEFAULT gst_audio_amplify_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);

static const GstElementDetails element_details =
GST_ELEMENT_DETAILS ("Audio amplifier",
    "Filter/Effect/Audio",
    "Amplifies an audio stream by a given factor",
    "Sebastian Dröge <slomo@circular-chaos.org>");

/* Filter signals and args */
enum
{
  /* FILL ME */
  LAST_SIGNAL
};

enum
{
  PROP_0,
  PROP_AMPLIFICATION,
  PROP_CLIPPING_METHOD
};

enum
{
  METHOD_CLIP = 0,
  METHOD_WRAP_NEGATIVE,
  METHOD_WRAP_POSITIVE,
  NUM_METHODS
};

#define GST_TYPE_AUDIO_AMPLIFY_CLIPPING_METHOD (gst_audio_amplify_clipping_method_get_type ())
static GType
gst_audio_amplify_clipping_method_get_type (void)
{
  static GType gtype = 0;

  if (gtype == 0) {
    static const GEnumValue values[] = {
      {METHOD_CLIP, "Normal Clipping (default)", "clip"},
      {METHOD_WRAP_NEGATIVE,
            "Push overdriven values back from the opposite side",
          "wrap-negative"},
      {METHOD_WRAP_POSITIVE, "Push overdriven values back from the same side",
          "wrap-positive"},
      {0, NULL, NULL}
    };

    /* FIXME 0.11: rename to GstAudioAmplifyClippingMethod */
    gtype = g_enum_register_static ("GstAudioPanoramaClippingMethod", values);
  }
  return gtype;
}

#define ALLOWED_CAPS \
    "audio/x-raw-int,"                                                \
    " depth=(int)16,"                                                 \
    " width=(int)16,"                                                 \
    " endianness=(int)BYTE_ORDER,"                                    \
    " signed=(bool)TRUE,"                                             \
    " rate=(int)[1,MAX],"                                             \
    " channels=(int)[1,MAX]; "                                        \
    "audio/x-raw-float,"                                              \
    " width=(int)32,"                                                 \
    " endianness=(int)BYTE_ORDER,"                                    \
    " rate=(int)[1,MAX],"                                             \
    " channels=(int)[1,MAX]"

#define DEBUG_INIT(bla) \
  GST_DEBUG_CATEGORY_INIT (gst_audio_amplify_debug, "audioamplify", 0, "audioamplify element");

GST_BOILERPLATE_FULL (GstAudioAmplify, gst_audio_amplify, GstAudioFilter,
    GST_TYPE_AUDIO_FILTER, DEBUG_INIT);

static void gst_audio_amplify_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec);
static void gst_audio_amplify_get_property (GObject * object, guint prop_id,
    GValue * value, GParamSpec * pspec);

static gboolean gst_audio_amplify_setup (GstAudioFilter * filter,
    GstRingBufferSpec * format);
static GstFlowReturn gst_audio_amplify_transform_ip (GstBaseTransform * base,
    GstBuffer * buf);

static void gst_audio_amplify_transform_int_clip (GstAudioAmplify * filter,
    gint16 * data, guint num_samples);
static void gst_audio_amplify_transform_int_wrap_negative (GstAudioAmplify *
    filter, gint16 * data, guint num_samples);
static void gst_audio_amplify_transform_int_wrap_positive (GstAudioAmplify *
    filter, gint16 * data, guint num_samples);
static void gst_audio_amplify_transform_float_clip (GstAudioAmplify * filter,
    gfloat * data, guint num_samples);
static void gst_audio_amplify_transform_float_wrap_negative (GstAudioAmplify *
    filter, gfloat * data, guint num_samples);
static void gst_audio_amplify_transform_float_wrap_positive (GstAudioAmplify *
    filter, gfloat * data, guint num_samples);

/* table of processing functions: [format][clipping_method] */
static GstAudioAmplifyProcessFunc processing_functions[2][3] = {
  {
        (GstAudioAmplifyProcessFunc) gst_audio_amplify_transform_int_clip,
        (GstAudioAmplifyProcessFunc)
        gst_audio_amplify_transform_int_wrap_negative,
        (GstAudioAmplifyProcessFunc)
      gst_audio_amplify_transform_int_wrap_positive},
  {
        (GstAudioAmplifyProcessFunc) gst_audio_amplify_transform_float_clip,
        (GstAudioAmplifyProcessFunc)
        gst_audio_amplify_transform_float_wrap_negative,
        (GstAudioAmplifyProcessFunc)
      gst_audio_amplify_transform_float_wrap_positive}
};

/* GObject vmethod implementations */

static void
gst_audio_amplify_base_init (gpointer klass)
{
  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
  GstCaps *caps;

  gst_element_class_set_details (element_class, &element_details);

  caps = gst_caps_from_string (ALLOWED_CAPS);
  gst_audio_filter_class_add_pad_templates (GST_AUDIO_FILTER_CLASS (klass),
      caps);
  gst_caps_unref (caps);
}

static void
gst_audio_amplify_class_init (GstAudioAmplifyClass * klass)
{
  GObjectClass *gobject_class;

  gobject_class = (GObjectClass *) klass;
  gobject_class->set_property = gst_audio_amplify_set_property;
  gobject_class->get_property = gst_audio_amplify_get_property;

  g_object_class_install_property (gobject_class, PROP_AMPLIFICATION,
      g_param_spec_float ("amplification", "Amplification",
          "Factor of amplification", 0.0, G_MAXFLOAT,
          1.0, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));

  /**
   * GstAudioAmplify:clipping-method
   *
   * Clipping method: clip mode set values higher than the maximum to the
   * maximum. The wrap-negative mode pushes those values back from the
   * opposite side, wrap-positive pushes them back from the same side.
   *
   **/
  g_object_class_install_property (gobject_class, PROP_CLIPPING_METHOD,
      g_param_spec_enum ("clipping-method", "Clipping method",
          "Selects how to handle values higher than the maximum",
          GST_TYPE_AUDIO_AMPLIFY_CLIPPING_METHOD, METHOD_CLIP,
          G_PARAM_READWRITE));

  GST_AUDIO_FILTER_CLASS (klass)->setup =
      GST_DEBUG_FUNCPTR (gst_audio_amplify_setup);
  GST_BASE_TRANSFORM_CLASS (klass)->transform_ip =
      GST_DEBUG_FUNCPTR (gst_audio_amplify_transform_ip);
}

static void
gst_audio_amplify_init (GstAudioAmplify * filter, GstAudioAmplifyClass * klass)
{
  filter->amplification = 1.0;
  filter->clipping_method = METHOD_CLIP;
  filter->format_index = 0;
  gst_base_transform_set_in_place (GST_BASE_TRANSFORM (filter), TRUE);
  gst_base_transform_set_gap_aware (GST_BASE_TRANSFORM (filter), TRUE);
}

static gboolean
gst_audio_amplify_set_process_function (GstAudioAmplify * filter)
{
  gint method_index;

  /* set processing function */

  method_index = filter->clipping_method;
  if (method_index >= NUM_METHODS || method_index < 0)
    method_index = METHOD_CLIP;

  filter->process = processing_functions[filter->format_index][method_index];
  return TRUE;
}

static void
gst_audio_amplify_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec)
{
  GstAudioAmplify *filter = GST_AUDIO_AMPLIFY (object);

  switch (prop_id) {
    case PROP_AMPLIFICATION:
      filter->amplification = g_value_get_float (value);
      gst_base_transform_set_passthrough (GST_BASE_TRANSFORM (filter),
          filter->amplification == 1.0);
      break;
    case PROP_CLIPPING_METHOD:
      filter->clipping_method = g_value_get_enum (value);
      gst_audio_amplify_set_process_function (filter);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static void
gst_audio_amplify_get_property (GObject * object, guint prop_id,
    GValue * value, GParamSpec * pspec)
{
  GstAudioAmplify *filter = GST_AUDIO_AMPLIFY (object);

  switch (prop_id) {
    case PROP_AMPLIFICATION:
      g_value_set_float (value, filter->amplification);
      break;
    case PROP_CLIPPING_METHOD:
      g_value_set_enum (value, filter->clipping_method);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

/* GstAudioFilter vmethod implementations */
static gboolean
gst_audio_amplify_setup (GstAudioFilter * base, GstRingBufferSpec * format)
{
  GstAudioAmplify *filter = GST_AUDIO_AMPLIFY (base);
  gboolean ret;

  if (format->type == GST_BUFTYPE_LINEAR && format->width == 16)
    filter->format_index = 0;
  else if (format->type == GST_BUFTYPE_FLOAT && format->width == 32)
    filter->format_index = 1;
  else
    goto wrong_format;

  ret = gst_audio_amplify_set_process_function (filter);
  if (!ret)
    GST_WARNING ("can't process input");

  return ret;

wrong_format:
  GST_DEBUG ("wrong format");
  return FALSE;
}

static void
gst_audio_amplify_transform_int_clip (GstAudioAmplify * filter,
    gint16 * data, guint num_samples)
{
  gint i;
  glong val;

  for (i = 0; i < num_samples; i++) {
    val = (*data) * filter->amplification;
    *data++ = (gint16) CLAMP (val, G_MININT16, G_MAXINT16);
  }
}

static void
gst_audio_amplify_transform_int_wrap_negative (GstAudioAmplify * filter,
    gint16 * data, guint num_samples)
{
  gint i;
  glong val;

  for (i = 0; i < num_samples; i++) {
    val = (*data) * filter->amplification;
    if (val > G_MAXINT16)
      val = ((val - G_MININT16) & 0xffff) + G_MININT16;
    else if (val < G_MININT16)
      val = ((val - G_MAXINT16) & 0xffff) + G_MAXINT16;
    *data++ = val;
  }
}

static void
gst_audio_amplify_transform_int_wrap_positive (GstAudioAmplify * filter,
    gint16 * data, guint num_samples)
{
  gint i;
  glong val;

  for (i = 0; i < num_samples; i++) {
    val = (*data) * filter->amplification;
    while (val > G_MAXINT16 || val < G_MININT16) {
      if (val > G_MAXINT16)
        val = G_MAXINT16 - (val - G_MAXINT16);
      else if (val < G_MININT16)
        val = G_MININT16 - (val - G_MININT16);
    }
    *data++ = val;
  }
}

static void
gst_audio_amplify_transform_float_clip (GstAudioAmplify * filter,
    gfloat * data, guint num_samples)
{
  gint i;
  gfloat val;

  for (i = 0; i < num_samples; i++) {
    val = (*data) * filter->amplification;
    if (val > 1.0)
      val = 1.0;
    else if (val < -1.0)
      val = -1.0;

    *data++ = val;
  }
}

static void
gst_audio_amplify_transform_float_wrap_negative (GstAudioAmplify * filter,
    gfloat * data, guint num_samples)
{
  gint i;
  gfloat val;

  for (i = 0; i < num_samples; i++) {
    val = (*data) * filter->amplification;
    while (val > 1.0 || val < -1.0) {
      if (val > 1.0)
        val = -1.0 + (val - 1.0);
      else if (val < -1.0)
        val = 1.0 + (val + 1.0);
    }
    *data++ = val;
  }
}

static void
gst_audio_amplify_transform_float_wrap_positive (GstAudioAmplify * filter,
    gfloat * data, guint num_samples)
{
  gint i;
  gfloat val;

  for (i = 0; i < num_samples; i++) {
    val = (*data) * filter->amplification;
    while (val > 1.0 || val < -1.0) {
      if (val > 1.0)
        val = 1.0 - (val - 1.0);
      else if (val < -1.0)
        val = -1.0 - (val + 1.0);
    }
    *data++ = val;
  }
}

/* GstBaseTransform vmethod implementations */
static GstFlowReturn
gst_audio_amplify_transform_ip (GstBaseTransform * base, GstBuffer * buf)
{
  GstAudioAmplify *filter = GST_AUDIO_AMPLIFY (base);
  guint num_samples =
      GST_BUFFER_SIZE (buf) / (GST_AUDIO_FILTER (filter)->format.width / 8);

  if (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_TIMESTAMP (buf)))
    gst_object_sync_values (G_OBJECT (filter), GST_BUFFER_TIMESTAMP (buf));

  if (gst_base_transform_is_passthrough (base) ||
      G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_GAP)))
    return GST_FLOW_OK;

  filter->process (filter, GST_BUFFER_DATA (buf), num_samples);

  return GST_FLOW_OK;
}