gststereo.c 6.47 KB
Newer Older
1
/* GStreamer
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
 *
 * 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.
 */

20 21 22 23
/* This effect is borrowed from xmms-0.6.1, though I mangled it so badly in
 * the process of copying it over that the xmms people probably won't want
 * any credit for it ;-)
 */
Stefan Kost's avatar
Stefan Kost committed
24 25 26 27 28 29 30 31 32 33 34 35
/**
 * SECTION:element-stereo
 *
 * Create a wide stereo effect.
 *
 * <refsect2>
 * <title>Example pipelines</title>
 * |[
 * gst-launch -v filesrc location=sine.ogg ! oggdemux ! vorbisdec ! audioconvert ! stereo ! audioconvert ! audioresample ! alsasink
 * ]| Play an Ogg/Vorbis file.
 * </refsect2>
 */
36

37 38 39
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
40
#include "gststereo.h"
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
41

42 43 44 45 46 47 48 49 50 51 52 53 54 55 56
#include <gst/gst.h>
#include <gst/base/gstbasetransform.h>
#include <gst/audio/audio.h>
#include <gst/audio/gstaudiofilter.h>
#include <gst/controller/gstcontroller.h>

#define ALLOWED_CAPS \
    "audio/x-raw-int,"                                                \
    " depth = (int) 16, "                                             \
    " width = (int) 16, "                                             \
    " endianness = (int) BYTE_ORDER,"                                 \
    " rate = (int) [ 1, MAX ],"                                       \
    " channels = (int) 2, "                                           \
    " signed = (boolean) TRUE"

Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
57
/* Stereo signals and args */
Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
58 59
enum
{
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
60 61 62 63
  /* FILL ME */
  LAST_SIGNAL
};

Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
64 65
enum
{
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
66 67 68 69 70
  ARG_0,
  ARG_ACTIVE,
  ARG_STEREO
};

Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
71 72 73 74
static void gst_stereo_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec);
static void gst_stereo_get_property (GObject * object, guint prop_id,
    GValue * value, GParamSpec * pspec);
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
75

76 77
static GstFlowReturn gst_stereo_transform_ip (GstBaseTransform * base,
    GstBuffer * outbuf);
Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
78

79
/*static guint gst_stereo_signals[LAST_SIGNAL] = { 0 }; */
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
80

81
GST_BOILERPLATE (GstStereo, gst_stereo, GstAudioFilter, GST_TYPE_AUDIO_FILTER);
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
82

83 84 85 86
static void
gst_stereo_base_init (gpointer g_class)
{
  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
87
  GstCaps *caps;
Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
88

89 90 91 92
  gst_element_class_set_details_simple (element_class, "Stereo effect",
      "Filter/Effect/Audio",
      "Muck with the stereo signal to enhance its 'stereo-ness'",
      "Erik Walthinsen <omega@cse.ogi.edu>");
93 94 95 96 97

  caps = gst_caps_from_string (ALLOWED_CAPS);
  gst_audio_filter_class_add_pad_templates (GST_AUDIO_FILTER_CLASS (g_class),
      caps);
  gst_caps_unref (caps);
98
}
99

Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
100
static void
Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
101
gst_stereo_class_init (GstStereoClass * klass)
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
102 103 104
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;
105
  GstBaseTransformClass *trans_class;
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
106

Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
107 108
  gobject_class = (GObjectClass *) klass;
  gstelement_class = (GstElementClass *) klass;
109
  trans_class = (GstBaseTransformClass *) klass;
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
110

111
  parent_class = g_type_class_peek_parent (klass);
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
112

113 114 115 116 117 118
  gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_stereo_set_property);
  gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_stereo_get_property);

  g_object_class_install_property (gobject_class, ARG_ACTIVE,
      g_param_spec_boolean ("active", "active", "active",
          TRUE, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
119

120 121 122 123 124
  g_object_class_install_property (gobject_class, ARG_STEREO,
      g_param_spec_float ("stereo", "stereo", "stereo",
          0.0, 1.0, 0.1, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));

  trans_class->transform_ip = GST_DEBUG_FUNCPTR (gst_stereo_transform_ip);
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
125 126 127
}

static void
128
gst_stereo_init (GstStereo * stereo, GstStereoClass * klass)
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
129
{
130 131
  stereo->active = TRUE;
  stereo->stereo = 0.1;
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
132 133
}

134 135
static GstFlowReturn
gst_stereo_transform_ip (GstBaseTransform * base, GstBuffer * outbuf)
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
136
{
137 138 139
  GstStereo *stereo = GST_STEREO (base);
  gint16 *data = (gint16 *) GST_BUFFER_DATA (outbuf);
  gint samples = GST_BUFFER_SIZE (outbuf) / 2;
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
140
  gint i;
141 142
  gdouble avg, ldiff, rdiff, tmp;
  gdouble mul = stereo->stereo;
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
143

144 145
  if (!gst_buffer_is_writable (outbuf))
    return GST_FLOW_OK;
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
146

147 148
  if (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_TIMESTAMP (outbuf)))
    gst_object_sync_values (G_OBJECT (stereo), GST_BUFFER_TIMESTAMP (outbuf));
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
149 150

  if (stereo->active) {
Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
151 152 153 154 155 156 157
    for (i = 0; i < samples / 2; i += 2) {
      avg = (data[i] + data[i + 1]) / 2;
      ldiff = data[i] - avg;
      rdiff = data[i + 1] - avg;

      tmp = avg + ldiff * mul;
      if (tmp < -32768)
158
        tmp = -32768;
Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
159
      if (tmp > 32767)
160
        tmp = 32767;
Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
161 162 163 164
      data[i] = tmp;

      tmp = avg + rdiff * mul;
      if (tmp < -32768)
165
        tmp = -32768;
Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
166
      if (tmp > 32767)
167
        tmp = 32767;
Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
168 169
      data[i + 1] = tmp;
    }
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
170 171
  }

172
  return GST_FLOW_OK;
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
173 174 175
}

static void
Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
176 177
gst_stereo_set_property (GObject * object, guint prop_id, const GValue * value,
    GParamSpec * pspec)
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
178 179 180
{
  GstStereo *stereo;

Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
181 182
  g_return_if_fail (GST_IS_STEREO (object));
  stereo = GST_STEREO (object);
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
183 184 185

  switch (prop_id) {
    case ARG_ACTIVE:
186
      stereo->active = g_value_get_boolean (value);
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
187 188 189 190 191
      break;
    case ARG_STEREO:
      stereo->stereo = g_value_get_float (value) * 10.0;
      break;
    default:
192
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
193 194 195 196 197
      break;
  }
}

static void
Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
198 199
gst_stereo_get_property (GObject * object, guint prop_id, GValue * value,
    GParamSpec * pspec)
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
200 201 202
{
  GstStereo *stereo;

Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
203 204
  g_return_if_fail (GST_IS_STEREO (object));
  stereo = GST_STEREO (object);
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
205 206 207

  switch (prop_id) {
    case ARG_ACTIVE:
208
      g_value_set_boolean (value, stereo->active);
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
209 210 211 212 213 214 215 216 217 218 219
      break;
    case ARG_STEREO:
      g_value_set_float (value, stereo->stereo / 10.0);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static gboolean
Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
220
plugin_init (GstPlugin * plugin)
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
221
{
Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
222 223
  return gst_element_register (plugin, "stereo", GST_RANK_NONE,
      GST_TYPE_STEREO);
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
224 225
}

Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
226 227 228 229
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
    GST_VERSION_MINOR,
    "stereo",
    "Muck with the stereo signal, enhance it's 'stereo-ness'",
230
    plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)