2 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
24 #include <gst/audio/audio.h>
25 #include "gstcutter.h"
28 /* elementfactory information */
29 static GstElementDetails cutter_details = {
31 "Filter/Editor/Audio",
32 "Audio Cutter to split audio into non-silent bits",
33 "Thomas <thomas@apestaart.org>",
37 /* Filter signals and args */
56 static GstStaticPadTemplate cutter_src_factory = GST_STATIC_PAD_TEMPLATE ("src",
59 GST_STATIC_CAPS (GST_AUDIO_INT_PAD_TEMPLATE_CAPS "; "
60 GST_AUDIO_FLOAT_PAD_TEMPLATE_CAPS)
63 static GstStaticPadTemplate cutter_sink_factory =
64 GST_STATIC_PAD_TEMPLATE ("sink",
67 GST_STATIC_CAPS (GST_AUDIO_INT_PAD_TEMPLATE_CAPS "; "
68 GST_AUDIO_FLOAT_PAD_TEMPLATE_CAPS)
71 static void gst_cutter_base_init (gpointer g_class);
72 static void gst_cutter_class_init (GstCutterClass * klass);
73 static void gst_cutter_init (GstCutter * filter);
75 static void gst_cutter_set_property (GObject * object, guint prop_id,
76 const GValue * value, GParamSpec * pspec);
77 static void gst_cutter_get_property (GObject * object, guint prop_id,
78 GValue * value, GParamSpec * pspec);
80 static void gst_cutter_chain (GstPad * pad, GstData * _data);
81 static double inline gst_cutter_16bit_ms (gint16 * data, guint numsamples);
82 static double inline gst_cutter_8bit_ms (gint8 * data, guint numsamples);
84 void gst_cutter_get_caps (GstPad * pad, GstCutter * filter);
86 static GstElementClass *parent_class = NULL;
87 static guint gst_cutter_signals[LAST_SIGNAL] = { 0 };
91 gst_cutter_get_type (void)
93 static GType cutter_type = 0;
96 static const GTypeInfo cutter_info = {
97 sizeof (GstCutterClass),
100 (GClassInitFunc) gst_cutter_class_init, NULL, NULL,
101 sizeof (GstCutter), 0,
102 (GInstanceInitFunc) gst_cutter_init,
104 cutter_type = g_type_register_static (GST_TYPE_ELEMENT, "GstCutter",
111 gst_cutter_base_init (gpointer g_class)
113 GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
115 gst_element_class_add_pad_template (element_class,
116 gst_static_pad_template_get (&cutter_src_factory));
117 gst_element_class_add_pad_template (element_class,
118 gst_static_pad_template_get (&cutter_sink_factory));
119 gst_element_class_set_details (element_class, &cutter_details);
122 static GstPadLinkReturn
123 gst_cutter_link (GstPad * pad, const GstCaps * caps)
128 filter = GST_CUTTER (gst_pad_get_parent (pad));
129 g_return_val_if_fail (filter != NULL, GST_PAD_LINK_REFUSED);
130 g_return_val_if_fail (GST_IS_CUTTER (filter), GST_PAD_LINK_REFUSED);
131 otherpad = (pad == filter->srcpad ? filter->sinkpad : filter->srcpad);
133 return gst_pad_try_set_caps (otherpad, caps);
137 gst_cutter_class_init (GstCutterClass * klass)
139 GObjectClass *gobject_class;
140 GstElementClass *gstelement_class;
142 gobject_class = (GObjectClass *) klass;
143 gstelement_class = (GstElementClass *) klass;
145 parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
147 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_THRESHOLD,
148 g_param_spec_double ("threshold", "Threshold",
149 "Volume threshold before trigger",
150 -G_MAXDOUBLE, G_MAXDOUBLE, 0.0, G_PARAM_READWRITE));
151 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_THRESHOLD_DB,
152 g_param_spec_double ("threshold_dB", "Threshold (dB)",
153 "Volume threshold before trigger (in dB)",
154 -G_MAXDOUBLE, G_MAXDOUBLE, 0.0, G_PARAM_READWRITE));
155 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_RUN_LENGTH,
156 g_param_spec_double ("runlength", "Runlength",
157 "Length of drop below threshold before cut_stop (seconds)",
158 0.0, G_MAXDOUBLE, 0.0, G_PARAM_READWRITE));
159 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_PRE_LENGTH,
160 g_param_spec_double ("prelength", "prelength",
161 "Length of pre-recording buffer (seconds)",
162 0.0, G_MAXDOUBLE, 0.0, G_PARAM_READWRITE));
163 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_LEAKY,
164 g_param_spec_boolean ("leaky", "Leaky",
165 "do we leak buffers when below threshold ?",
166 FALSE, G_PARAM_READWRITE));
167 gst_cutter_signals[CUT_START] =
168 g_signal_new ("cut-start", G_TYPE_FROM_CLASS (klass),
170 G_STRUCT_OFFSET (GstCutterClass, cut_start), NULL, NULL,
171 g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
172 gst_cutter_signals[CUT_STOP] =
173 g_signal_new ("cut-stop", G_TYPE_FROM_CLASS (klass),
175 G_STRUCT_OFFSET (GstCutterClass, cut_stop), NULL, NULL,
176 g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
179 gobject_class->set_property = gst_cutter_set_property;
180 gobject_class->get_property = gst_cutter_get_property;
184 gst_cutter_init (GstCutter * filter)
187 gst_pad_new_from_template (gst_static_pad_template_get
188 (&cutter_sink_factory), "sink");
190 gst_pad_new_from_template (gst_static_pad_template_get
191 (&cutter_src_factory), "src");
193 filter->threshold_level = 0.1;
194 filter->threshold_length = 0.5;
195 filter->silent_run_length = 0.0;
196 filter->silent = TRUE;
198 filter->pre_length = 0.2;
199 filter->pre_run_length = 0.0;
200 filter->pre_buffer = NULL;
201 filter->leaky = FALSE;
203 gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
204 gst_pad_set_chain_function (filter->sinkpad, gst_cutter_chain);
205 gst_pad_set_link_function (filter->sinkpad, gst_cutter_link);
207 gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
208 /*gst_pad_set_link_function (filter->srcpad, gst_cutter_link); */
212 gst_cutter_chain (GstPad * pad, GstData * _data)
214 GstBuffer *buf = GST_BUFFER (_data);
217 double RMS = 0.0; /* RMS of signal in buffer */
218 double ms = 0.0; /* mean square value of buffer */
219 static gboolean silent_prev = FALSE; /* previous value of silent */
220 GstBuffer *prebuf; /* pointer to a prebuffer element */
222 g_return_if_fail (pad != NULL);
223 g_return_if_fail (GST_IS_PAD (pad));
224 g_return_if_fail (buf != NULL);
226 filter = GST_CUTTER (GST_OBJECT_PARENT (pad));
227 g_return_if_fail (filter != NULL);
228 g_return_if_fail (GST_IS_CUTTER (filter));
230 if (gst_audio_is_buffer_framed (pad, buf) == FALSE)
231 g_warning ("audio buffer is not framed !\n");
233 if (!filter->have_caps)
234 gst_cutter_get_caps (pad, filter);
236 in_data = (gint16 *) GST_BUFFER_DATA (buf);
237 GST_DEBUG ("length of prerec buffer: %.3f sec", filter->pre_run_length);
239 /* calculate mean square value on buffer */
240 switch (filter->width) {
242 ms = gst_cutter_16bit_ms (in_data, GST_BUFFER_SIZE (buf) / 2);
245 ms = gst_cutter_8bit_ms ((gint8 *) in_data, GST_BUFFER_SIZE (buf));
248 /* this shouldn't happen */
249 g_print ("WARNING: no mean square function for width %d\n",
254 silent_prev = filter->silent;
256 RMS = sqrt (ms) / (double) filter->max_sample;
257 /* if RMS below threshold, add buffer length to silent run length count
260 GST_DEBUG ("buffer stats: ms %f, RMS %f, audio length %f",
261 ms, RMS, gst_audio_length (filter->srcpad, buf));
262 if (RMS < filter->threshold_level)
263 filter->silent_run_length += gst_audio_length (filter->srcpad, buf);
265 filter->silent_run_length = 0.0;
266 filter->silent = FALSE;
269 if (filter->silent_run_length > filter->threshold_length)
270 /* it has been silent long enough, flag it */
271 filter->silent = TRUE;
273 /* has the silent status changed ? if so, send right signal
274 * and, if from silent -> not silent, flush pre_record buffer
276 if (filter->silent != silent_prev) {
277 if (filter->silent) {
278 /* g_print ("DEBUG: cutter: cut to here, turning off out\n"); */
279 g_signal_emit (G_OBJECT (filter), gst_cutter_signals[CUT_STOP], 0);
283 /* g_print ("DEBUG: cutter: start from here, turning on out\n"); */
284 /* first of all, flush current buffer */
285 g_signal_emit (G_OBJECT (filter), gst_cutter_signals[CUT_START], 0);
286 GST_DEBUG ("flushing buffer of length %.3f", filter->pre_run_length);
287 while (filter->pre_buffer) {
288 prebuf = (g_list_first (filter->pre_buffer))->data;
289 filter->pre_buffer = g_list_remove (filter->pre_buffer, prebuf);
290 gst_pad_push (filter->srcpad, GST_DATA (prebuf));
293 GST_DEBUG ("flushed %d buffers", count);
294 filter->pre_run_length = 0.0;
297 /* now check if we have to send the new buffer to the internal buffer cache
298 * or to the srcpad */
299 if (filter->silent) {
300 /* we ref it before putting it in the pre_buffer */
301 /* FIXME: we shouldn't probably do this, because the buffer
302 * arrives reffed already; the plugin should just push it
303 * or unref it to make it disappear */
305 gst_buffer_ref (buf);
307 filter->pre_buffer = g_list_append (filter->pre_buffer, buf);
308 filter->pre_run_length += gst_audio_length (filter->srcpad, buf);
309 while (filter->pre_run_length > filter->pre_length) {
310 prebuf = (g_list_first (filter->pre_buffer))->data;
311 g_assert (GST_IS_BUFFER (prebuf));
312 filter->pre_buffer = g_list_remove (filter->pre_buffer, prebuf);
313 filter->pre_run_length -= gst_audio_length (filter->srcpad, prebuf);
314 /* only pass buffers if we don't leak */
316 gst_pad_push (filter->srcpad, GST_DATA (prebuf));
317 /* we unref it after getting it out of the pre_buffer */
318 gst_buffer_unref (prebuf);
321 gst_pad_push (filter->srcpad, GST_DATA (buf));
325 gst_cutter_16bit_ms (gint16 * data, guint num_samples)
326 #include "filter.func"
327 static double inline gst_cutter_8bit_ms (gint8 * data, guint num_samples)
328 #include "filter.func"
330 gst_cutter_set_property (GObject * object, guint prop_id,
331 const GValue * value, GParamSpec * pspec)
335 g_return_if_fail (GST_IS_CUTTER (object));
336 filter = GST_CUTTER (object);
341 filter->threshold_level = g_value_get_double (value);
342 GST_DEBUG ("DEBUG: set threshold level to %f", filter->threshold_level);
344 case ARG_THRESHOLD_DB:
345 /* set the level given in dB
346 * value in dB = 20 * log (value)
347 * values in dB < 0 result in values between 0 and 1
349 filter->threshold_level = pow (10, g_value_get_double (value) / 20);
350 GST_DEBUG ("DEBUG: set threshold level to %f", filter->threshold_level);
353 /* set the minimum length of the silent run required */
354 filter->threshold_length = g_value_get_double (value);
357 /* set the length of the pre-record block */
358 filter->pre_length = g_value_get_double (value);
361 /* set if the pre-record buffer is leaky or not */
362 filter->leaky = g_value_get_boolean (value);
365 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
371 gst_cutter_get_property (GObject * object, guint prop_id,
372 GValue * value, GParamSpec * pspec)
376 g_return_if_fail (GST_IS_CUTTER (object));
377 filter = GST_CUTTER (object);
381 g_value_set_double (value, filter->threshold_length);
384 g_value_set_double (value, filter->threshold_level);
386 case ARG_THRESHOLD_DB:
387 g_value_set_double (value, 20 * log (filter->threshold_level));
390 g_value_set_double (value, filter->pre_length);
393 g_value_set_boolean (value, filter->leaky);
396 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
402 plugin_init (GstPlugin * plugin)
404 /* load audio support library */
405 if (!gst_library_load ("gstaudio"))
408 if (!gst_element_register (plugin, "cutter", GST_RANK_NONE, GST_TYPE_CUTTER))
414 GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
417 "Audio Cutter to split audio into non-silent bits",
418 plugin_init, VERSION, "LGPL", GST_PACKAGE, GST_ORIGIN)
420 void gst_cutter_get_caps (GstPad * pad, GstCutter * filter)
422 const GstCaps *caps = NULL;
423 GstStructure *structure;
425 caps = GST_PAD_CAPS (pad);
426 /* FIXME : Please change this to a better warning method ! */
427 g_assert (caps != NULL);
429 printf ("WARNING: get_caps: Could not get caps of pad !\n");
430 structure = gst_caps_get_structure (caps, 0);
431 gst_structure_get_int (structure, "width", &filter->width);
432 filter->max_sample = gst_audio_highest_sample_value (pad);
433 filter->have_caps = TRUE;