1 /* vim: set sts=2 sw=2 et: */
4 * Copyright (C) 2006 Josep Torra <j.torra@telefonica.net>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 02111-1307, USA.
26 #include <gst/audio/audio.h>
30 GST_DEBUG_CATEGORY_STATIC (gst_pitch_debug);
31 #define GST_CAT_DEFAULT gst_pitch_debug
34 #define WANTED RATE * 2
36 /* Filter signals and args */
48 static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
51 GST_STATIC_CAPS ("audio/x-raw-int, "
53 "channels = (int) 1, "
54 "endianness = (int) BYTE_ORDER, "
55 "width = (int) 16, " "depth = (int) 16, " "signed = (boolean) true")
58 static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
61 GST_STATIC_CAPS ("audio/x-raw-int, "
62 "rate = (int) [ 1, MAX ], "
63 "channels = (int) [1, MAX], "
64 "endianness = (int) BYTE_ORDER, "
65 "width = (int) 16, " "depth = (int) 16, " "signed = (boolean) true")
68 #define DEBUG_INIT(bla) \
69 GST_DEBUG_CATEGORY_INIT (gst_pitch_debug, "Pitch", 0, "fundamental frequency plugin");
71 GST_BOILERPLATE_FULL (GstPitch, gst_pitch, GstBaseTransform,
72 GST_TYPE_BASE_TRANSFORM, DEBUG_INIT);
74 static void gst_pitch_set_property (GObject * object, guint prop_id,
75 const GValue * value, GParamSpec * pspec);
76 static void gst_pitch_get_property (GObject * object, guint prop_id,
77 GValue * value, GParamSpec * pspec);
78 static void gst_pitch_dispose (GObject * object);
80 static gboolean gst_pitch_set_caps (GstBaseTransform * trans, GstCaps * in,
82 static gboolean gst_pitch_start (GstBaseTransform * trans);
84 static GstFlowReturn gst_pitch_transform_ip (GstBaseTransform * trans,
87 #define DEFAULT_PROP_ALGORITHM GST_PITCH_ALGORITHM_FFT
89 #define GST_TYPE_PITCH_ALGORITHM (gst_pitch_algorithm_get_type())
91 gst_pitch_algorithm_get_type (void)
93 static GType pitch_algorithm_type = 0;
94 static const GEnumValue pitch_algorithm[] = {
95 {GST_PITCH_ALGORITHM_FFT, "fft", "fft"},
96 {GST_PITCH_ALGORITHM_HPS, "hps", "hps"},
100 if (!pitch_algorithm_type) {
101 pitch_algorithm_type =
102 g_enum_register_static ("GstPitchAlgorithm",
105 return pitch_algorithm_type;
108 /* GObject vmethod implementations */
111 gst_pitch_base_init (gpointer klass)
113 static GstElementDetails element_details = {
115 "Filter/Analyzer/Audio",
116 "Run an FFT on the audio signal, output fundamental frequency",
117 "Josep Torra <j.torra@telefonica.net>"
119 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
121 gst_element_class_add_pad_template (element_class,
122 gst_static_pad_template_get (&src_template));
123 gst_element_class_add_pad_template (element_class,
124 gst_static_pad_template_get (&sink_template));
125 gst_element_class_set_details (element_class, &element_details);
129 gst_pitch_class_init (GstPitchClass * klass)
131 GObjectClass *gobject_class;
132 GstBaseTransformClass *trans_class = GST_BASE_TRANSFORM_CLASS (klass);
134 gobject_class = (GObjectClass *) klass;
135 gobject_class->set_property = gst_pitch_set_property;
136 gobject_class->get_property = gst_pitch_get_property;
137 gobject_class->dispose = gst_pitch_dispose;
139 trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_pitch_set_caps);
140 trans_class->start = GST_DEBUG_FUNCPTR (gst_pitch_start);
141 trans_class->transform_ip = GST_DEBUG_FUNCPTR (gst_pitch_transform_ip);
142 trans_class->passthrough_on_same_caps = TRUE;
144 g_object_class_install_property (gobject_class, PROP_SIGNAL_FFREQ,
145 g_param_spec_boolean ("message", "Message",
146 "Post a fundamental frequency message for each passed interval",
147 TRUE, G_PARAM_READWRITE));
149 g_object_class_install_property (gobject_class, PROP_SIGNAL_MINFREQ,
150 g_param_spec_int ("minfreq", "MinFreq",
151 "Initial scan frequency, default 30 Hz",
152 1, G_MAXINT, 30, G_PARAM_READWRITE));
154 g_object_class_install_property (gobject_class, PROP_SIGNAL_MAXFREQ,
155 g_param_spec_int ("maxfreq", "MaxFreq",
156 "Final scan frequency, default 1500 Hz",
157 1, G_MAXINT, 1500, G_PARAM_READWRITE));
159 g_object_class_install_property (gobject_class, PROP_ALGORITHM,
160 g_param_spec_enum ("algorithm", "Algorithm",
161 "Pitch detection algorithm to use",
162 GST_TYPE_PITCH_ALGORITHM, DEFAULT_PROP_ALGORITHM,
166 GST_BASE_TRANSFORM_CLASS (klass)->transform_ip =
167 GST_DEBUG_FUNCPTR (gst_pitch_transform_ip);
171 gst_pitch_setup_algorithm (GstPitch * filter)
173 if (filter->algorithm == GST_PITCH_ALGORITHM_HPS) {
174 if (NULL == filter->module)
175 filter->module = (gint *) g_malloc (RATE * sizeof (gint));
179 g_free (filter->module);
181 filter->module = NULL;
186 gst_pitch_init (GstPitch * filter, GstPitchClass * klass)
188 filter->adapter = gst_adapter_new ();
190 filter->minfreq = 30;
191 filter->maxfreq = 1500;
192 filter->message = TRUE;
193 filter->algorithm = DEFAULT_PROP_ALGORITHM;
194 gst_pitch_setup_algorithm (filter);
198 gst_pitch_dispose (GObject * object)
200 GstPitch *filter = GST_PITCH (object);
202 if (filter->adapter) {
203 g_object_unref (filter->adapter);
204 filter->adapter = NULL;
207 g_free (filter->fft_cfg);
208 g_free (filter->signal);
209 g_free (filter->spectrum);
211 g_free (filter->module);
215 G_OBJECT_CLASS (parent_class)->dispose (object);
219 gst_pitch_set_property (GObject * object, guint prop_id,
220 const GValue * value, GParamSpec * pspec)
222 GstPitch *filter = GST_PITCH (object);
225 case PROP_SIGNAL_FFREQ:
226 filter->message = g_value_get_boolean (value);
228 case PROP_SIGNAL_MINFREQ:
229 filter->minfreq = g_value_get_int (value);
231 case PROP_SIGNAL_MAXFREQ:
232 filter->maxfreq = g_value_get_int (value);
235 filter->algorithm = g_value_get_enum (value);
236 gst_pitch_setup_algorithm (filter);
239 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
245 gst_pitch_get_property (GObject * object, guint prop_id,
246 GValue * value, GParamSpec * pspec)
248 GstPitch *filter = GST_PITCH (object);
251 case PROP_SIGNAL_FFREQ:
252 g_value_set_boolean (value, filter->message);
254 case PROP_SIGNAL_MINFREQ:
255 g_value_set_int (value, filter->minfreq);
257 case PROP_SIGNAL_MAXFREQ:
258 g_value_set_int (value, filter->maxfreq);
261 g_value_set_enum (value, filter->algorithm);
264 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
270 gst_pitch_set_caps (GstBaseTransform * trans, GstCaps * in, GstCaps * out)
272 GstPitch *filter = GST_PITCH (trans);
274 filter->fft_cfg = kiss_fft_alloc (RATE, 0, NULL, NULL);
276 (kiss_fft_cpx *) g_malloc (RATE * sizeof (kiss_fft_cpx));
278 (kiss_fft_cpx *) g_malloc (RATE * sizeof (kiss_fft_cpx));
284 gst_pitch_start (GstBaseTransform * trans)
286 GstPitch *filter = GST_PITCH (trans);
288 gst_adapter_clear (filter->adapter);
294 gst_pitch_message_new (GstPitch * filter)
297 gint i, min_i, max_i;
298 gint frequency, frequency_module;
300 /* Extract fundamental frequency */
302 frequency_module = 0;
303 min_i = filter->minfreq;
304 max_i = filter->maxfreq;
306 GST_DEBUG_OBJECT (filter, "min_freq = %d, max_freq = %d", filter->minfreq,
308 /*GST_DEBUG_OBJECT (filter, "min_i = %d, max_i = %d", min_i, max_i); */
310 switch (filter->algorithm) {
312 case GST_PITCH_ALGORITHM_FFT:
316 for (i = min_i; i < max_i; i++) {
317 module = (filter->spectrum[i].r * filter->spectrum[i].r);
318 module += (filter->spectrum[i].i * filter->spectrum[i].i);
321 GST_LOG_OBJECT (filter, "module[%d] = %d", i, module);
323 /* find strongest peak */
324 if (module > frequency_module) {
325 frequency_module = module;
332 case GST_PITCH_ALGORITHM_HPS:
334 gint prev_frequency = 0;
337 for (i = min_i; i < RATE; i++) {
338 filter->module[i] = (filter->spectrum[i].r * filter->spectrum[i].r);
339 filter->module[i] += (filter->spectrum[i].i * filter->spectrum[i].i);
341 if (filter->module[i] > 0)
342 GST_LOG_OBJECT (filter, "module[%d] = %d", i, filter->module[i]);
345 /* Harmonic Product Spectrum algorithm */
346 #define MAX_DS_FACTOR (6)
347 for (i = min_i; (i <= max_i) && (i < RATE); i++) {
348 for (j = 2; j <= MAX_DS_FACTOR; j++) {
353 /* this is not part of the HPS but it seems
354 * there are lots of zeroes in the spectrum ...
356 if (filter->module[t] != 0)
357 filter->module[i] *= filter->module[t];
360 /* find strongest peak */
361 if (filter->module[i] > frequency_module) {
362 prev_frequency = frequency;
363 frequency_module = filter->module[i];
368 /* try to correct octave error */
369 if (frequency != 0 && prev_frequency != 0) {
370 float ratio = (float) frequency / (float) prev_frequency;
371 if (ratio >= 1.9 && ratio < 2.1 && (float) filter->module[prev_frequency] >= 0.2 * (float) frequency_module ) {
372 g_debug("Chose freq %d[%d] over %d[%d]\n", prev_frequency, filter->module[prev_frequency], frequency, filter->module[frequency]);
373 frequency = prev_frequency;
374 frequency_module = filter->module[prev_frequency];
384 g_debug("freq %d[%d]\n", frequency, frequency_module);
386 GST_DEBUG_OBJECT (filter, "preparing message, frequency = %d ", frequency);
388 s = gst_structure_new ("pitch", "frequency", G_TYPE_INT, frequency, NULL);
390 return gst_message_new_element (GST_OBJECT (filter), s);
393 /* GstBaseTransform vmethod implementations */
395 /* this function does the actual processing
398 gst_pitch_transform_ip (GstBaseTransform * trans, GstBuffer * in)
400 GstPitch *filter = GST_PITCH (trans);
405 GST_DEBUG_OBJECT (filter, "transform : %ld bytes", GST_BUFFER_SIZE (in));
406 gst_adapter_push (filter->adapter, gst_buffer_ref (in));
408 /* required number of bytes */
409 avail = gst_adapter_available (filter->adapter);
410 GST_DEBUG_OBJECT (filter, "avail: %d wanted: %d", avail, WANTED);
412 if (avail > WANTED) {
414 /* copy sample data in the complex vector */
415 samples = (gint16 *) gst_adapter_peek (filter->adapter, WANTED);
417 for (i = 0; i < RATE; i++) {
418 filter->signal[i].r = (kiss_fft_scalar) (samples[i]);
421 /* flush half second of data to implement sliding window */
422 gst_adapter_flush (filter->adapter, WANTED >> 1);
424 GST_DEBUG ("perform fft");
425 kiss_fft (filter->fft_cfg, filter->signal, filter->spectrum);
427 if (filter->message) {
428 GstMessage *m = gst_pitch_message_new (filter);
429 gst_element_post_message (GST_ELEMENT (filter), m);
437 /* entry point to initialize the plug-in
438 * initialize the plug-in itself
439 * register the element factories and pad templates
440 * register the features
442 * exchange the string 'plugin' with your elemnt name
444 /* static */ gboolean
445 plugin_pitch_init (GstPlugin * plugin)
447 return gst_element_register (plugin, "pitch", GST_RANK_NONE, GST_TYPE_PITCH);
450 /* this is the structure that gstreamer looks for to register plugins
452 * exchange the strings 'plugin' and 'Template plugin' with you plugin name and
456 GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
459 "Run an FFT on the audio signal, output fundamental frequency",
460 plugin_init, VERSION, "LGPL", "GStreamer", "http://gstreamer.net/")