2 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
3 * <2006,2011> Stefan Kost <ensonic@users.sf.net>
4 * <2007-2009> Sebastian Dröge <sebastian.droege@collabora.co.uk>
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., 51 Franklin St, Fifth Floor,
19 * Boston, MA 02110-1301, USA.
22 * SECTION:element-spectrum
24 * The Spectrum element analyzes the frequency spectrum of an audio signal.
25 * If the #GstSpectrum:post-messages property is #TRUE, it sends analysis results
26 * as element messages named
27 * <classname>"spectrum"</classname> after each interval of time given
28 * by the #GstSpectrum:interval property.
30 * The message's structure contains some combination of these fields:
35 * <classname>"timestamp"</classname>:
36 * the timestamp of the buffer that triggered the message.
42 * <classname>"stream-time"</classname>:
43 * the stream time of the buffer.
49 * <classname>"running-time"</classname>:
50 * the running_time of the buffer.
56 * <classname>"duration"</classname>:
57 * the duration of the buffer.
63 * <classname>"endtime"</classname>:
64 * the end time of the buffer that triggered the message as stream time (this
65 * is deprecated, as it can be calculated from stream-time + duration)
70 * #GstValueList of #gfloat
71 * <classname>"magnitude"</classname>:
72 * the level for each frequency band in dB. All values below the value of the
73 * #GstSpectrum:threshold property will be set to the threshold. Only present
74 * if the #GstSpectrum:message-magnitude property is %TRUE.
79 * #GstValueList of #gfloat
80 * <classname>"phase"</classname>:
81 * The phase for each frequency band. The value is between -pi and pi. Only
82 * present if the #GstSpectrum:message-phase property is %TRUE.
87 * If #GstSpectrum:multi-channel property is set to true. magnitude and phase
88 * fields will be each a nested #GstValueArray. The first dimension are the
89 * channels and the second dimension are the values.
92 * <title>Example application</title>
93 * <informalexample><programlisting language="C">
94 * <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" parse="text" href="../../../../tests/examples/spectrum/spectrum-example.c" />
95 * </programlisting></informalexample>
105 #include "gstspectrum.h"
107 GST_DEBUG_CATEGORY_STATIC (gst_spectrum_debug);
108 #define GST_CAT_DEFAULT gst_spectrum_debug
110 /* elementfactory information */
111 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
112 # define FORMATS "{ S16LE, S24LE, S32LE, F32LE, F64LE }"
114 # define FORMATS "{ S16BE, S24BE, S32BE, F32BE, F64BE }"
117 #define ALLOWED_CAPS \
118 GST_AUDIO_CAPS_MAKE (FORMATS) ", " \
119 "layout = (string) interleaved"
121 /* Spectrum properties */
122 #define DEFAULT_POST_MESSAGES TRUE
123 #define DEFAULT_MESSAGE_MAGNITUDE TRUE
124 #define DEFAULT_MESSAGE_PHASE FALSE
125 #define DEFAULT_INTERVAL (GST_SECOND / 10)
126 #define DEFAULT_BANDS 128
127 #define DEFAULT_THRESHOLD -60
128 #define DEFAULT_MULTI_CHANNEL FALSE
134 PROP_MESSAGE_MAGNITUDE,
142 #define gst_spectrum_parent_class parent_class
143 G_DEFINE_TYPE (GstSpectrum, gst_spectrum, GST_TYPE_AUDIO_FILTER);
145 static void gst_spectrum_finalize (GObject * object);
146 static void gst_spectrum_set_property (GObject * object, guint prop_id,
147 const GValue * value, GParamSpec * pspec);
148 static void gst_spectrum_get_property (GObject * object, guint prop_id,
149 GValue * value, GParamSpec * pspec);
150 static gboolean gst_spectrum_start (GstBaseTransform * trans);
151 static gboolean gst_spectrum_stop (GstBaseTransform * trans);
152 static GstFlowReturn gst_spectrum_transform_ip (GstBaseTransform * trans,
154 static gboolean gst_spectrum_setup (GstAudioFilter * base,
155 const GstAudioInfo * info);
158 gst_spectrum_class_init (GstSpectrumClass * klass)
160 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
161 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
162 GstBaseTransformClass *trans_class = GST_BASE_TRANSFORM_CLASS (klass);
163 GstAudioFilterClass *filter_class = GST_AUDIO_FILTER_CLASS (klass);
166 gobject_class->set_property = gst_spectrum_set_property;
167 gobject_class->get_property = gst_spectrum_get_property;
168 gobject_class->finalize = gst_spectrum_finalize;
170 trans_class->start = GST_DEBUG_FUNCPTR (gst_spectrum_start);
171 trans_class->stop = GST_DEBUG_FUNCPTR (gst_spectrum_stop);
172 trans_class->transform_ip = GST_DEBUG_FUNCPTR (gst_spectrum_transform_ip);
173 trans_class->passthrough_on_same_caps = TRUE;
175 filter_class->setup = GST_DEBUG_FUNCPTR (gst_spectrum_setup);
177 g_object_class_install_property (gobject_class, PROP_POST_MESSAGES,
178 g_param_spec_boolean ("post-messages", "Post Messages",
179 "Whether to post a 'spectrum' element message on the bus for each "
180 "passed interval", DEFAULT_POST_MESSAGES,
181 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
183 g_object_class_install_property (gobject_class, PROP_MESSAGE_MAGNITUDE,
184 g_param_spec_boolean ("message-magnitude", "Magnitude",
185 "Whether to add a 'magnitude' field to the structure of any "
186 "'spectrum' element messages posted on the bus",
187 DEFAULT_MESSAGE_MAGNITUDE,
188 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
190 g_object_class_install_property (gobject_class, PROP_MESSAGE_PHASE,
191 g_param_spec_boolean ("message-phase", "Phase",
192 "Whether to add a 'phase' field to the structure of any "
193 "'spectrum' element messages posted on the bus",
194 DEFAULT_MESSAGE_PHASE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
196 g_object_class_install_property (gobject_class, PROP_INTERVAL,
197 g_param_spec_uint64 ("interval", "Interval",
198 "Interval of time between message posts (in nanoseconds)",
199 1, G_MAXUINT64, DEFAULT_INTERVAL,
200 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
202 g_object_class_install_property (gobject_class, PROP_BANDS,
203 g_param_spec_uint ("bands", "Bands", "Number of frequency bands",
204 2, ((guint) G_MAXINT + 2) / 2, DEFAULT_BANDS,
205 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
207 g_object_class_install_property (gobject_class, PROP_THRESHOLD,
208 g_param_spec_int ("threshold", "Threshold",
209 "dB threshold for result. All lower values will be set to this",
210 G_MININT, 0, DEFAULT_THRESHOLD,
211 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
213 g_object_class_install_property (gobject_class, PROP_MULTI_CHANNEL,
214 g_param_spec_boolean ("multi-channel", "Multichannel results",
215 "Send separate results for each channel",
216 DEFAULT_MULTI_CHANNEL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
218 GST_DEBUG_CATEGORY_INIT (gst_spectrum_debug, "spectrum", 0,
219 "audio spectrum analyser element");
221 gst_element_class_set_static_metadata (element_class, "Spectrum analyzer",
222 "Filter/Analyzer/Audio",
223 "Run an FFT on the audio signal, output spectrum data",
224 "Erik Walthinsen <omega@cse.ogi.edu>, "
225 "Stefan Kost <ensonic@users.sf.net>, "
226 "Sebastian Dröge <sebastian.droege@collabora.co.uk>");
228 caps = gst_caps_from_string (ALLOWED_CAPS);
229 gst_audio_filter_class_add_pad_templates (filter_class, caps);
230 gst_caps_unref (caps);
234 gst_spectrum_init (GstSpectrum * spectrum)
236 spectrum->post_messages = DEFAULT_POST_MESSAGES;
237 spectrum->message_magnitude = DEFAULT_MESSAGE_MAGNITUDE;
238 spectrum->message_phase = DEFAULT_MESSAGE_PHASE;
239 spectrum->interval = DEFAULT_INTERVAL;
240 spectrum->bands = DEFAULT_BANDS;
241 spectrum->threshold = DEFAULT_THRESHOLD;
243 g_mutex_init (&spectrum->lock);
247 gst_spectrum_alloc_channel_data (GstSpectrum * spectrum)
250 GstSpectrumChannel *cd;
251 guint bands = spectrum->bands;
252 guint nfft = 2 * bands - 2;
254 g_assert (spectrum->channel_data == NULL);
256 spectrum->num_channels = (spectrum->multi_channel) ?
257 GST_AUDIO_FILTER_CHANNELS (spectrum) : 1;
259 GST_DEBUG_OBJECT (spectrum, "allocating data for %d channels",
260 spectrum->num_channels);
262 spectrum->channel_data = g_new (GstSpectrumChannel, spectrum->num_channels);
263 for (i = 0; i < spectrum->num_channels; i++) {
264 cd = &spectrum->channel_data[i];
265 cd->fft_ctx = gst_fft_f32_new (nfft, FALSE);
266 cd->input = g_new0 (gfloat, nfft);
267 cd->input_tmp = g_new0 (gfloat, nfft);
268 cd->freqdata = g_new0 (GstFFTF32Complex, bands);
269 cd->spect_magnitude = g_new0 (gfloat, bands);
270 cd->spect_phase = g_new0 (gfloat, bands);
275 gst_spectrum_free_channel_data (GstSpectrum * spectrum)
277 if (spectrum->channel_data) {
279 GstSpectrumChannel *cd;
281 GST_DEBUG_OBJECT (spectrum, "freeing data for %d channels",
282 spectrum->num_channels);
284 for (i = 0; i < spectrum->num_channels; i++) {
285 cd = &spectrum->channel_data[i];
287 gst_fft_f32_free (cd->fft_ctx);
289 g_free (cd->input_tmp);
290 g_free (cd->freqdata);
291 g_free (cd->spect_magnitude);
292 g_free (cd->spect_phase);
294 g_free (spectrum->channel_data);
295 spectrum->channel_data = NULL;
300 gst_spectrum_flush (GstSpectrum * spectrum)
302 spectrum->num_frames = 0;
303 spectrum->num_fft = 0;
305 spectrum->accumulated_error = 0;
309 gst_spectrum_reset_state (GstSpectrum * spectrum)
311 GST_DEBUG_OBJECT (spectrum, "resetting state");
313 gst_spectrum_free_channel_data (spectrum);
314 gst_spectrum_flush (spectrum);
318 gst_spectrum_finalize (GObject * object)
320 GstSpectrum *spectrum = GST_SPECTRUM (object);
322 gst_spectrum_reset_state (spectrum);
323 g_mutex_clear (&spectrum->lock);
325 G_OBJECT_CLASS (parent_class)->finalize (object);
329 gst_spectrum_set_property (GObject * object, guint prop_id,
330 const GValue * value, GParamSpec * pspec)
332 GstSpectrum *filter = GST_SPECTRUM (object);
335 case PROP_POST_MESSAGES:
336 filter->post_messages = g_value_get_boolean (value);
338 case PROP_MESSAGE_MAGNITUDE:
339 filter->message_magnitude = g_value_get_boolean (value);
341 case PROP_MESSAGE_PHASE:
342 filter->message_phase = g_value_get_boolean (value);
345 guint64 interval = g_value_get_uint64 (value);
346 g_mutex_lock (&filter->lock);
347 if (filter->interval != interval) {
348 filter->interval = interval;
349 gst_spectrum_reset_state (filter);
351 g_mutex_unlock (&filter->lock);
355 guint bands = g_value_get_uint (value);
356 g_mutex_lock (&filter->lock);
357 if (filter->bands != bands) {
358 filter->bands = bands;
359 gst_spectrum_reset_state (filter);
361 g_mutex_unlock (&filter->lock);
365 filter->threshold = g_value_get_int (value);
367 case PROP_MULTI_CHANNEL:{
368 gboolean multi_channel = g_value_get_boolean (value);
369 g_mutex_lock (&filter->lock);
370 if (filter->multi_channel != multi_channel) {
371 filter->multi_channel = multi_channel;
372 gst_spectrum_reset_state (filter);
374 g_mutex_unlock (&filter->lock);
378 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
384 gst_spectrum_get_property (GObject * object, guint prop_id,
385 GValue * value, GParamSpec * pspec)
387 GstSpectrum *filter = GST_SPECTRUM (object);
390 case PROP_POST_MESSAGES:
391 g_value_set_boolean (value, filter->post_messages);
393 case PROP_MESSAGE_MAGNITUDE:
394 g_value_set_boolean (value, filter->message_magnitude);
396 case PROP_MESSAGE_PHASE:
397 g_value_set_boolean (value, filter->message_phase);
400 g_value_set_uint64 (value, filter->interval);
403 g_value_set_uint (value, filter->bands);
406 g_value_set_int (value, filter->threshold);
408 case PROP_MULTI_CHANNEL:
409 g_value_set_boolean (value, filter->multi_channel);
412 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
418 gst_spectrum_start (GstBaseTransform * trans)
420 GstSpectrum *spectrum = GST_SPECTRUM (trans);
422 gst_spectrum_reset_state (spectrum);
428 gst_spectrum_stop (GstBaseTransform * trans)
430 GstSpectrum *spectrum = GST_SPECTRUM (trans);
432 gst_spectrum_reset_state (spectrum);
437 /* mixing data readers */
440 input_data_mixed_float (const guint8 * _in, gfloat * out, guint len,
441 guint channels, gfloat max_value, guint op, guint nfft)
445 gfloat *in = (gfloat *) _in;
447 for (j = 0; j < len; j++) {
449 for (i = 1; i < channels; i++)
451 out[op] = v / channels;
452 op = (op + 1) % nfft;
457 input_data_mixed_double (const guint8 * _in, gfloat * out, guint len,
458 guint channels, gfloat max_value, guint op, guint nfft)
462 gdouble *in = (gdouble *) _in;
464 for (j = 0; j < len; j++) {
466 for (i = 1; i < channels; i++)
468 out[op] = v / channels;
469 op = (op + 1) % nfft;
474 input_data_mixed_int32_max (const guint8 * _in, gfloat * out, guint len,
475 guint channels, gfloat max_value, guint op, guint nfft)
478 gint32 *in = (gint32 *) _in;
481 for (j = 0; j < len; j++) {
482 v = in[ip++] / max_value;
483 for (i = 1; i < channels; i++)
484 v += in[ip++] / max_value;
485 out[op] = v / channels;
486 op = (op + 1) % nfft;
491 input_data_mixed_int24_max (const guint8 * _in, gfloat * out, guint len,
492 guint channels, gfloat max_value, guint op, guint nfft)
497 for (j = 0; j < len; j++) {
498 for (i = 0; i < channels; i++) {
499 #if G_BYTE_ORDER == G_BIG_ENDIAN
500 gint32 value = GST_READ_UINT24_BE (_in);
502 gint32 value = GST_READ_UINT24_LE (_in);
504 if (value & 0x00800000)
506 v += value / max_value;
509 out[op] = v / channels;
510 op = (op + 1) % nfft;
515 input_data_mixed_int16_max (const guint8 * _in, gfloat * out, guint len,
516 guint channels, gfloat max_value, guint op, guint nfft)
519 gint16 *in = (gint16 *) _in;
522 for (j = 0; j < len; j++) {
523 v = in[ip++] / max_value;
524 for (i = 1; i < channels; i++)
525 v += in[ip++] / max_value;
526 out[op] = v / channels;
527 op = (op + 1) % nfft;
531 /* non mixing data readers */
534 input_data_float (const guint8 * _in, gfloat * out, guint len, guint channels,
535 gfloat max_value, guint op, guint nfft)
538 gfloat *in = (gfloat *) _in;
540 for (j = 0, ip = 0; j < len; j++, ip += channels) {
542 op = (op + 1) % nfft;
547 input_data_double (const guint8 * _in, gfloat * out, guint len, guint channels,
548 gfloat max_value, guint op, guint nfft)
551 gdouble *in = (gdouble *) _in;
553 for (j = 0, ip = 0; j < len; j++, ip += channels) {
555 op = (op + 1) % nfft;
560 input_data_int32_max (const guint8 * _in, gfloat * out, guint len,
561 guint channels, gfloat max_value, guint op, guint nfft)
564 gint32 *in = (gint32 *) _in;
566 for (j = 0, ip = 0; j < len; j++, ip += channels) {
567 out[op] = in[ip] / max_value;
568 op = (op + 1) % nfft;
573 input_data_int24_max (const guint8 * _in, gfloat * out, guint len,
574 guint channels, gfloat max_value, guint op, guint nfft)
578 for (j = 0; j < len; j++) {
579 #if G_BYTE_ORDER == G_BIG_ENDIAN
580 gint32 v = GST_READ_UINT24_BE (_in);
582 gint32 v = GST_READ_UINT24_LE (_in);
587 out[op] = v / max_value;
588 op = (op + 1) % nfft;
593 input_data_int16_max (const guint8 * _in, gfloat * out, guint len,
594 guint channels, gfloat max_value, guint op, guint nfft)
597 gint16 *in = (gint16 *) _in;
599 for (j = 0, ip = 0; j < len; j++, ip += channels) {
600 out[op] = in[ip] / max_value;
601 op = (op + 1) % nfft;
606 gst_spectrum_setup (GstAudioFilter * base, const GstAudioInfo * info)
608 GstSpectrum *spectrum = GST_SPECTRUM (base);
609 gboolean multi_channel = spectrum->multi_channel;
610 GstSpectrumInputData input_data = NULL;
612 g_mutex_lock (&spectrum->lock);
613 switch (GST_AUDIO_INFO_FORMAT (info)) {
614 case GST_AUDIO_FORMAT_S16:
616 multi_channel ? input_data_int16_max : input_data_mixed_int16_max;
618 case GST_AUDIO_FORMAT_S24:
620 multi_channel ? input_data_int24_max : input_data_mixed_int24_max;
622 case GST_AUDIO_FORMAT_S32:
624 multi_channel ? input_data_int32_max : input_data_mixed_int32_max;
626 case GST_AUDIO_FORMAT_F32:
627 input_data = multi_channel ? input_data_float : input_data_mixed_float;
629 case GST_AUDIO_FORMAT_F64:
630 input_data = multi_channel ? input_data_double : input_data_mixed_double;
633 g_assert_not_reached ();
636 spectrum->input_data = input_data;
638 gst_spectrum_reset_state (spectrum);
639 g_mutex_unlock (&spectrum->lock);
645 gst_spectrum_message_add_container (GstStructure * s, GType type,
650 g_value_init (&v, type);
651 /* will copy-by-value */
652 gst_structure_set_value (s, name, &v);
654 return (GValue *) gst_structure_get_value (s, name);
658 gst_spectrum_message_add_list (GValue * cv, gfloat * data, guint num_values)
663 g_value_init (&v, G_TYPE_FLOAT);
664 for (i = 0; i < num_values; i++) {
665 g_value_set_float (&v, data[i]);
666 gst_value_list_append_value (cv, &v); /* copies by value */
672 gst_spectrum_message_add_array (GValue * cv, gfloat * data, guint num_values)
678 g_value_init (&a, GST_TYPE_ARRAY);
680 g_value_init (&v, G_TYPE_FLOAT);
681 for (i = 0; i < num_values; i++) {
682 g_value_set_float (&v, data[i]);
683 gst_value_array_append_value (&a, &v); /* copies by value */
687 gst_value_array_append_value (cv, &a); /* copies by value */
692 gst_spectrum_message_new (GstSpectrum * spectrum, GstClockTime timestamp,
693 GstClockTime duration)
695 GstBaseTransform *trans = GST_BASE_TRANSFORM_CAST (spectrum);
696 GstSpectrumChannel *cd;
698 GValue *mcv = NULL, *pcv = NULL;
699 GstClockTime endtime, running_time, stream_time;
701 GST_DEBUG_OBJECT (spectrum, "preparing message, bands =%d ", spectrum->bands);
703 running_time = gst_segment_to_running_time (&trans->segment, GST_FORMAT_TIME,
705 stream_time = gst_segment_to_stream_time (&trans->segment, GST_FORMAT_TIME,
707 /* endtime is for backwards compatibility */
708 endtime = stream_time + duration;
710 s = gst_structure_new ("spectrum",
711 "endtime", GST_TYPE_CLOCK_TIME, endtime,
712 "timestamp", G_TYPE_UINT64, timestamp,
713 "stream-time", G_TYPE_UINT64, stream_time,
714 "running-time", G_TYPE_UINT64, running_time,
715 "duration", G_TYPE_UINT64, duration, NULL);
717 if (!spectrum->multi_channel) {
718 cd = &spectrum->channel_data[0];
720 if (spectrum->message_magnitude) {
721 /* FIXME 0.11: this should be an array, not a list */
722 mcv = gst_spectrum_message_add_container (s, GST_TYPE_LIST, "magnitude");
723 gst_spectrum_message_add_list (mcv, cd->spect_magnitude, spectrum->bands);
725 if (spectrum->message_phase) {
726 /* FIXME 0.11: this should be an array, not a list */
727 pcv = gst_spectrum_message_add_container (s, GST_TYPE_LIST, "phase");
728 gst_spectrum_message_add_list (pcv, cd->spect_phase, spectrum->bands);
732 guint channels = GST_AUDIO_FILTER_CHANNELS (spectrum);
734 if (spectrum->message_magnitude) {
735 mcv = gst_spectrum_message_add_container (s, GST_TYPE_ARRAY, "magnitude");
737 if (spectrum->message_phase) {
738 pcv = gst_spectrum_message_add_container (s, GST_TYPE_ARRAY, "phase");
741 for (c = 0; c < channels; c++) {
742 cd = &spectrum->channel_data[c];
744 if (spectrum->message_magnitude) {
745 gst_spectrum_message_add_array (mcv, cd->spect_magnitude,
748 if (spectrum->message_phase) {
749 gst_spectrum_message_add_array (pcv, cd->spect_magnitude,
754 return gst_message_new_element (GST_OBJECT (spectrum), s);
758 gst_spectrum_run_fft (GstSpectrum * spectrum, GstSpectrumChannel * cd,
762 guint bands = spectrum->bands;
763 guint nfft = 2 * bands - 2;
764 gint threshold = spectrum->threshold;
765 gfloat *input = cd->input;
766 gfloat *input_tmp = cd->input_tmp;
767 gfloat *spect_magnitude = cd->spect_magnitude;
768 gfloat *spect_phase = cd->spect_phase;
769 GstFFTF32Complex *freqdata = cd->freqdata;
770 GstFFTF32 *fft_ctx = cd->fft_ctx;
772 for (i = 0; i < nfft; i++)
773 input_tmp[i] = input[(input_pos + i) % nfft];
775 gst_fft_f32_window (fft_ctx, input_tmp, GST_FFT_WINDOW_HAMMING);
777 gst_fft_f32_fft (fft_ctx, input_tmp, freqdata);
779 if (spectrum->message_magnitude) {
781 /* Calculate magnitude in db */
782 for (i = 0; i < bands; i++) {
783 val = freqdata[i].r * freqdata[i].r;
784 val += freqdata[i].i * freqdata[i].i;
786 val = 10.0 * log10 (val);
789 spect_magnitude[i] += val;
793 if (spectrum->message_phase) {
794 /* Calculate phase */
795 for (i = 0; i < bands; i++)
796 spect_phase[i] += atan2 (freqdata[i].i, freqdata[i].r);
801 gst_spectrum_prepare_message_data (GstSpectrum * spectrum,
802 GstSpectrumChannel * cd)
805 guint bands = spectrum->bands;
806 guint num_fft = spectrum->num_fft;
808 /* Calculate average */
809 if (spectrum->message_magnitude) {
810 gfloat *spect_magnitude = cd->spect_magnitude;
811 for (i = 0; i < bands; i++)
812 spect_magnitude[i] /= num_fft;
814 if (spectrum->message_phase) {
815 gfloat *spect_phase = cd->spect_phase;
816 for (i = 0; i < bands; i++)
817 spect_phase[i] /= num_fft;
822 gst_spectrum_reset_message_data (GstSpectrum * spectrum,
823 GstSpectrumChannel * cd)
825 guint bands = spectrum->bands;
826 gfloat *spect_magnitude = cd->spect_magnitude;
827 gfloat *spect_phase = cd->spect_phase;
829 /* reset spectrum accumulators */
830 memset (spect_magnitude, 0, bands * sizeof (gfloat));
831 memset (spect_phase, 0, bands * sizeof (gfloat));
835 gst_spectrum_transform_ip (GstBaseTransform * trans, GstBuffer * buffer)
837 GstSpectrum *spectrum = GST_SPECTRUM (trans);
838 guint rate = GST_AUDIO_FILTER_RATE (spectrum);
839 guint channels = GST_AUDIO_FILTER_CHANNELS (spectrum);
840 guint bps = GST_AUDIO_FILTER_BPS (spectrum);
841 guint bpf = GST_AUDIO_FILTER_BPF (spectrum);
842 guint output_channels = spectrum->multi_channel ? channels : 1;
844 gfloat max_value = (1UL << ((bps << 3) - 1)) - 1;
845 guint bands = spectrum->bands;
846 guint nfft = 2 * bands - 2;
852 guint fft_todo, msg_todo, block_size;
853 gboolean have_full_interval;
854 GstSpectrumChannel *cd;
855 GstSpectrumInputData input_data;
857 g_mutex_lock (&spectrum->lock);
858 gst_buffer_map (buffer, &map, GST_MAP_READ);
862 GST_LOG_OBJECT (spectrum, "input size: %" G_GSIZE_FORMAT " bytes", size);
864 if (GST_BUFFER_IS_DISCONT (buffer)) {
865 GST_DEBUG_OBJECT (spectrum, "Discontinuity detected -- flushing");
866 gst_spectrum_flush (spectrum);
869 /* If we don't have a FFT context yet (or it was reset due to parameter
870 * changes) get one and allocate memory for everything
872 if (spectrum->channel_data == NULL) {
873 GST_DEBUG_OBJECT (spectrum, "allocating for bands %u", bands);
875 gst_spectrum_alloc_channel_data (spectrum);
877 /* number of sample frames we process before posting a message
878 * interval is in ns */
879 spectrum->frames_per_interval =
880 gst_util_uint64_scale (spectrum->interval, rate, GST_SECOND);
881 spectrum->frames_todo = spectrum->frames_per_interval;
882 /* rounding error for frames_per_interval in ns,
883 * aggregated it in accumulated_error */
884 spectrum->error_per_interval = (spectrum->interval * rate) % GST_SECOND;
885 if (spectrum->frames_per_interval == 0)
886 spectrum->frames_per_interval = 1;
888 GST_INFO_OBJECT (spectrum, "interval %" GST_TIME_FORMAT ", fpi %"
889 G_GUINT64_FORMAT ", error %" GST_TIME_FORMAT,
890 GST_TIME_ARGS (spectrum->interval), spectrum->frames_per_interval,
891 GST_TIME_ARGS (spectrum->error_per_interval));
893 spectrum->input_pos = 0;
895 gst_spectrum_flush (spectrum);
898 if (spectrum->num_frames == 0)
899 spectrum->message_ts = GST_BUFFER_TIMESTAMP (buffer);
901 input_pos = spectrum->input_pos;
902 input_data = spectrum->input_data;
904 while (size >= bpf) {
905 /* run input_data for a chunk of data */
906 fft_todo = nfft - (spectrum->num_frames % nfft);
907 msg_todo = spectrum->frames_todo - spectrum->num_frames;
908 GST_LOG_OBJECT (spectrum,
909 "message frames todo: %u, fft frames todo: %u, input frames %"
910 G_GSIZE_FORMAT, msg_todo, fft_todo, (size / bpf));
911 block_size = msg_todo;
912 if (block_size > (size / bpf))
913 block_size = (size / bpf);
914 if (block_size > fft_todo)
915 block_size = fft_todo;
917 for (c = 0; c < output_channels; c++) {
918 cd = &spectrum->channel_data[c];
920 /* Move the current frames into our ringbuffers */
921 input_data (data + c * bps, input, block_size, channels, max_value,
924 data += block_size * bpf;
925 size -= block_size * bpf;
926 input_pos = (input_pos + block_size) % nfft;
927 spectrum->num_frames += block_size;
929 have_full_interval = (spectrum->num_frames == spectrum->frames_todo);
931 GST_LOG_OBJECT (spectrum,
932 "size: %" G_GSIZE_FORMAT ", do-fft = %d, do-message = %d", size,
933 (spectrum->num_frames % nfft == 0), have_full_interval);
935 /* If we have enough frames for an FFT or we have all frames required for
936 * the interval and we haven't run a FFT, then run an FFT */
937 if ((spectrum->num_frames % nfft == 0) ||
938 (have_full_interval && !spectrum->num_fft)) {
939 for (c = 0; c < output_channels; c++) {
940 cd = &spectrum->channel_data[c];
941 gst_spectrum_run_fft (spectrum, cd, input_pos);
946 /* Do we have the FFTs for one interval? */
947 if (have_full_interval) {
948 GST_DEBUG_OBJECT (spectrum, "nfft: %u frames: %" G_GUINT64_FORMAT
949 " fpi: %" G_GUINT64_FORMAT " error: %" GST_TIME_FORMAT, nfft,
950 spectrum->num_frames, spectrum->frames_per_interval,
951 GST_TIME_ARGS (spectrum->accumulated_error));
953 spectrum->frames_todo = spectrum->frames_per_interval;
954 if (spectrum->accumulated_error >= GST_SECOND) {
955 spectrum->accumulated_error -= GST_SECOND;
956 spectrum->frames_todo++;
958 spectrum->accumulated_error += spectrum->error_per_interval;
960 if (spectrum->post_messages) {
963 for (c = 0; c < output_channels; c++) {
964 cd = &spectrum->channel_data[c];
965 gst_spectrum_prepare_message_data (spectrum, cd);
968 m = gst_spectrum_message_new (spectrum, spectrum->message_ts,
971 gst_element_post_message (GST_ELEMENT (spectrum), m);
974 if (GST_CLOCK_TIME_IS_VALID (spectrum->message_ts))
975 spectrum->message_ts +=
976 gst_util_uint64_scale (spectrum->num_frames, GST_SECOND, rate);
978 for (c = 0; c < output_channels; c++) {
979 cd = &spectrum->channel_data[c];
980 gst_spectrum_reset_message_data (spectrum, cd);
982 spectrum->num_frames = 0;
983 spectrum->num_fft = 0;
987 spectrum->input_pos = input_pos;
989 gst_buffer_unmap (buffer, &map);
990 g_mutex_unlock (&spectrum->lock);
992 g_assert (size == 0);
998 plugin_init (GstPlugin * plugin)
1000 return gst_element_register (plugin, "spectrum", GST_RANK_NONE,
1004 GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
1007 "Run an FFT on the audio signal, output spectrum data",
1008 plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)