521 lines
18 KiB
C++
521 lines
18 KiB
C++
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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* <2006,2011> Stefan Kost <ensonic@users.sf.net>
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* <2007-2009> Sebastian Dröge <sebastian.droege@collabora.co.uk>
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* <2018-2024> Jonas Kvinge <jonas@jkvinge.net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include <cstring>
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#include <cmath>
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#include <glib.h>
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#include <gst/gst.h>
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#include <gst/audio/gstaudiofilter.h>
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#include <fftw3.h>
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#include "gstfastspectrum.h"
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GST_DEBUG_CATEGORY_STATIC(gst_strawberry_fastspectrum_debug);
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namespace {
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// Spectrum properties
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constexpr auto DEFAULT_INTERVAL = (GST_SECOND / 10);
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constexpr auto DEFAULT_BANDS = 128;
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enum {
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PROP_0,
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PROP_INTERVAL,
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PROP_BANDS
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};
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} // namespace
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#ifdef __GNUC__
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wold-style-cast"
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#endif
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G_DEFINE_TYPE(GstStrawberryFastSpectrum, gst_strawberry_fastspectrum, GST_TYPE_AUDIO_FILTER)
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#ifdef __GNUC__
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#pragma GCC diagnostic pop
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#endif
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static void gst_strawberry_fastspectrum_finalize(GObject *object);
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static void gst_strawberry_fastspectrum_set_property(GObject *object, const guint prop_id, const GValue *value, GParamSpec *pspec);
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static void gst_strawberry_fastspectrum_get_property(GObject *object, const guint prop_id, GValue *value, GParamSpec *pspec);
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static gboolean gst_strawberry_fastspectrum_start(GstBaseTransform *transform);
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static gboolean gst_strawberry_fastspectrum_stop(GstBaseTransform *transform);
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static GstFlowReturn gst_strawberry_fastspectrum_transform_ip(GstBaseTransform *transform, GstBuffer *buffer);
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static gboolean gst_strawberry_fastspectrum_setup(GstAudioFilter *audio_filter, const GstAudioInfo *audio_info);
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static void gst_strawberry_fastspectrum_class_init(GstStrawberryFastSpectrumClass *klass) {
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GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
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GstElementClass *element_class = GST_ELEMENT_CLASS(klass);
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GstBaseTransformClass *transform_class = GST_BASE_TRANSFORM_CLASS(klass);
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GstAudioFilterClass *filter_class = GST_AUDIO_FILTER_CLASS(klass);
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gobject_class->set_property = gst_strawberry_fastspectrum_set_property;
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gobject_class->get_property = gst_strawberry_fastspectrum_get_property;
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gobject_class->finalize = gst_strawberry_fastspectrum_finalize;
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transform_class->start = GST_DEBUG_FUNCPTR(gst_strawberry_fastspectrum_start);
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transform_class->stop = GST_DEBUG_FUNCPTR(gst_strawberry_fastspectrum_stop);
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transform_class->transform_ip = GST_DEBUG_FUNCPTR(gst_strawberry_fastspectrum_transform_ip);
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transform_class->passthrough_on_same_caps = TRUE;
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filter_class->setup = GST_DEBUG_FUNCPTR(gst_strawberry_fastspectrum_setup);
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g_object_class_install_property(gobject_class, PROP_INTERVAL, g_param_spec_uint64("interval", "Interval", "Interval of time between message posts (in nanoseconds)", 1, G_MAXUINT64, DEFAULT_INTERVAL, static_cast<GParamFlags>(G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
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g_object_class_install_property(gobject_class, PROP_BANDS, g_param_spec_uint("bands", "Bands", "Number of frequency bands", 0, G_MAXUINT, DEFAULT_BANDS, static_cast<GParamFlags>(G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
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GST_DEBUG_CATEGORY_INIT(gst_strawberry_fastspectrum_debug, "spectrum", 0, "audio spectrum analyser element");
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gst_element_class_set_static_metadata(element_class,
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"Fast spectrum analyzer using FFTW",
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"Filter/Analyzer/Audio",
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"Run an FFT on the audio signal, output spectrum data",
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"Erik Walthinsen <omega@cse.ogi.edu>, "
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"Stefan Kost <ensonic@users.sf.net>, "
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"Sebastian Dröge <sebastian.droege@collabora.co.uk>, "
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"Jonas Kvinge <jonas@jkvinge.net>");
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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GstCaps *caps = gst_caps_from_string(GST_AUDIO_CAPS_MAKE("{ S16LE, S24LE, S32LE, F32LE, F64LE }") ", layout = (string) interleaved, channels = 1");
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#else
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GstCaps *caps = gst_caps_from_string(GST_AUDIO_CAPS_MAKE("{ S16BE, S24BE, S32BE, F32BE, F64BE }") ", layout = (string) interleaved, channels = 1");
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#endif
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gst_audio_filter_class_add_pad_templates(filter_class, caps);
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gst_caps_unref(caps);
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g_mutex_init(&klass->fftw_lock);
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}
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static void gst_strawberry_fastspectrum_init(GstStrawberryFastSpectrum *fastspectrum) {
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fastspectrum->interval = DEFAULT_INTERVAL;
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fastspectrum->bands = DEFAULT_BANDS;
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fastspectrum->channel_data_initialized = false;
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g_mutex_init(&fastspectrum->lock);
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}
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static void gst_strawberry_fastspectrum_alloc_channel_data(GstStrawberryFastSpectrum *fastspectrum) {
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const guint bands = fastspectrum->bands;
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const guint nfft = 2 * bands - 2;
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fastspectrum->input_ring_buffer = new double[nfft];
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fastspectrum->fft_input = reinterpret_cast<double*>(fftw_malloc(sizeof(double) * nfft));
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fastspectrum->fft_output = reinterpret_cast<fftw_complex*>(fftw_malloc(sizeof(fftw_complex) * (nfft / 2 + 1)));
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fastspectrum->spect_magnitude = new double[bands] {};
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GstStrawberryFastSpectrumClass *klass = reinterpret_cast<GstStrawberryFastSpectrumClass*>(G_OBJECT_GET_CLASS(fastspectrum));
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{
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g_mutex_lock(&klass->fftw_lock);
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fastspectrum->plan = fftw_plan_dft_r2c_1d(static_cast<int>(nfft), fastspectrum->fft_input, fastspectrum->fft_output, FFTW_ESTIMATE);
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g_mutex_unlock(&klass->fftw_lock);
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}
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fastspectrum->channel_data_initialized = true;
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}
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static void gst_strawberry_fastspectrum_free_channel_data(GstStrawberryFastSpectrum *fastspectrum) {
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GstStrawberryFastSpectrumClass *klass = reinterpret_cast<GstStrawberryFastSpectrumClass*>(G_OBJECT_GET_CLASS(fastspectrum));
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if (fastspectrum->channel_data_initialized) {
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{
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g_mutex_lock(&klass->fftw_lock);
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fftw_destroy_plan(fastspectrum->plan);
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g_mutex_unlock(&klass->fftw_lock);
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}
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fftw_free(fastspectrum->fft_input);
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fftw_free(fastspectrum->fft_output);
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delete[] fastspectrum->input_ring_buffer;
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delete[] fastspectrum->spect_magnitude;
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fastspectrum->channel_data_initialized = false;
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}
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}
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static void gst_strawberry_fastspectrum_flush(GstStrawberryFastSpectrum *fastspectrum) {
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fastspectrum->num_frames = 0;
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fastspectrum->num_fft = 0;
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fastspectrum->accumulated_error = 0;
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}
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static void gst_strawberry_fastspectrum_reset_state(GstStrawberryFastSpectrum *fastspectrum) {
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GST_DEBUG_OBJECT(fastspectrum, "resetting state");
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gst_strawberry_fastspectrum_free_channel_data(fastspectrum);
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gst_strawberry_fastspectrum_flush(fastspectrum);
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}
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static void gst_strawberry_fastspectrum_finalize(GObject *object) {
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GstStrawberryFastSpectrum *fastspectrum = reinterpret_cast<GstStrawberryFastSpectrum*>(object);
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gst_strawberry_fastspectrum_reset_state(fastspectrum);
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g_mutex_clear(&fastspectrum->lock);
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G_OBJECT_CLASS(gst_strawberry_fastspectrum_parent_class)->finalize(object);
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}
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static void gst_strawberry_fastspectrum_set_property(GObject *object, const guint prop_id, const GValue *value, GParamSpec *pspec) {
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GstStrawberryFastSpectrum *filter = reinterpret_cast<GstStrawberryFastSpectrum*>(object);
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switch (prop_id) {
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case PROP_INTERVAL: {
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const guint64 interval = g_value_get_uint64(value);
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g_mutex_lock(&filter->lock);
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if (filter->interval != interval) {
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filter->interval = interval;
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gst_strawberry_fastspectrum_reset_state(filter);
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}
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g_mutex_unlock(&filter->lock);
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break;
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}
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case PROP_BANDS: {
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const guint bands = g_value_get_uint(value);
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g_mutex_lock(&filter->lock);
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if (filter->bands != bands) {
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filter->bands = bands;
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gst_strawberry_fastspectrum_reset_state(filter);
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}
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g_mutex_unlock(&filter->lock);
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break;
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}
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
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break;
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}
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}
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static void gst_strawberry_fastspectrum_get_property(GObject *object, const guint prop_id, GValue *value, GParamSpec *pspec) {
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GstStrawberryFastSpectrum *fastspectrum = reinterpret_cast<GstStrawberryFastSpectrum*>(object);
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switch (prop_id) {
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case PROP_INTERVAL:
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g_value_set_uint64(value, fastspectrum->interval);
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break;
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case PROP_BANDS:
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g_value_set_uint(value, fastspectrum->bands);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
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break;
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}
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}
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static gboolean gst_strawberry_fastspectrum_start(GstBaseTransform *transform) {
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GstStrawberryFastSpectrum *fastspectrum = reinterpret_cast<GstStrawberryFastSpectrum*>(transform);
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gst_strawberry_fastspectrum_reset_state(fastspectrum);
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return TRUE;
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}
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static gboolean gst_strawberry_fastspectrum_stop(GstBaseTransform *transform) {
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GstStrawberryFastSpectrum *fastspectrum = reinterpret_cast<GstStrawberryFastSpectrum*>(transform);
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gst_strawberry_fastspectrum_reset_state(fastspectrum);
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return TRUE;
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}
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// Mixing data readers
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static void gst_strawberry_fastspectrum_input_data_mixed_float(const guint8 *_in, double *out, const guint64 len, const double max_value, guint op, const guint nfft) {
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(void) max_value;
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const gfloat *in = reinterpret_cast<const gfloat*>(_in);
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guint ip = 0;
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for (guint64 j = 0; j < len; j++) {
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out[op] = in[ip++];
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op = (op + 1) % nfft;
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}
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}
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static void gst_strawberry_fastspectrum_input_data_mixed_double(const guint8 *_in, double *out, const guint64 len, const double max_value, guint op, const guint nfft) {
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(void) max_value;
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const gdouble *in = reinterpret_cast<const gdouble*>(_in);
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guint ip = 0;
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for (guint64 j = 0; j < len; j++) {
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out[op] = in[ip++];
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op = (op + 1) % nfft;
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}
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}
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static void gst_strawberry_fastspectrum_input_data_mixed_int32_max(const guint8 *_in, double *out, const guint64 len, const double max_value, guint op, const guint nfft) {
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const gint32 *in = reinterpret_cast<const gint32*>(_in);
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guint ip = 0;
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for (guint64 j = 0; j < len; j++) {
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out[op] = in[ip++] / max_value;
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op = (op + 1) % nfft;
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}
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}
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static void gst_strawberry_fastspectrum_input_data_mixed_int24_max(const guint8 *_in, double *out, const guint64 len, const double max_value, guint op, const guint nfft) {
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for (guint64 j = 0; j < len; j++) {
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#if G_BYTE_ORDER == G_BIG_ENDIAN
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guint32 value = GST_READ_UINT24_BE(_in);
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#else
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guint32 value = GST_READ_UINT24_LE(_in);
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#endif
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if (value & 0x00800000) {
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value |= 0xff000000;
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}
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out[op] = value / max_value;
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op = (op + 1) % nfft;
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_in += 3;
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}
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}
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static void gst_strawberry_fastspectrum_input_data_mixed_int16_max(const guint8 *_in, double *out, const guint64 len, const double max_value, guint op, const guint nfft) {
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const gint16 *in = reinterpret_cast<const gint16*>(_in);
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guint ip = 0;
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for (guint64 j = 0; j < len; j++) {
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out[op] = in[ip++] / max_value;
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op = (op + 1) % nfft;
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}
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}
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static gboolean gst_strawberry_fastspectrum_setup(GstAudioFilter *audio_filter, const GstAudioInfo *audio_info) {
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GstStrawberryFastSpectrum *fastspectrum = reinterpret_cast<GstStrawberryFastSpectrum*>(audio_filter);
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GstStrawberryFastSpectrumInputData input_data = nullptr;
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g_mutex_lock(&fastspectrum->lock);
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switch (GST_AUDIO_INFO_FORMAT(audio_info)) {
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case GST_AUDIO_FORMAT_S16:
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input_data = gst_strawberry_fastspectrum_input_data_mixed_int16_max;
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break;
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case GST_AUDIO_FORMAT_S24:
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input_data = gst_strawberry_fastspectrum_input_data_mixed_int24_max;
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break;
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case GST_AUDIO_FORMAT_S32:
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input_data = gst_strawberry_fastspectrum_input_data_mixed_int32_max;
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break;
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case GST_AUDIO_FORMAT_F32:
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input_data = gst_strawberry_fastspectrum_input_data_mixed_float;
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break;
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case GST_AUDIO_FORMAT_F64:
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input_data = gst_strawberry_fastspectrum_input_data_mixed_double;
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break;
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default:
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g_assert_not_reached();
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break;
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}
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fastspectrum->input_data = input_data;
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gst_strawberry_fastspectrum_reset_state(fastspectrum);
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g_mutex_unlock(&fastspectrum->lock);
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return TRUE;
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}
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static void gst_strawberry_fastspectrum_run_fft(GstStrawberryFastSpectrum *fastspectrum, const guint input_pos) {
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const guint bands = fastspectrum->bands;
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const guint nfft = 2 * bands - 2;
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for (guint i = 0; i < nfft; i++) {
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fastspectrum->fft_input[i] = fastspectrum->input_ring_buffer[(input_pos + i) % nfft];
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}
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// Should be safe to execute the same plan multiple times in parallel.
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fftw_execute(fastspectrum->plan);
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// Calculate magnitude in db
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for (guint i = 0; i < bands; i++) {
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gdouble value = fastspectrum->fft_output[i][0] * fastspectrum->fft_output[i][0];
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value += fastspectrum->fft_output[i][1] * fastspectrum->fft_output[i][1];
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value /= nfft * nfft;
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fastspectrum->spect_magnitude[i] += value;
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}
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}
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static GstFlowReturn gst_strawberry_fastspectrum_transform_ip(GstBaseTransform *transform, GstBuffer *buffer) {
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GstStrawberryFastSpectrum *fastspectrum = reinterpret_cast<GstStrawberryFastSpectrum*>(transform);
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const guint rate = GST_AUDIO_FILTER_RATE(fastspectrum);
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const guint bps = GST_AUDIO_FILTER_BPS(fastspectrum);
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const guint64 bpf = GST_AUDIO_FILTER_BPF(fastspectrum);
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const double max_value = static_cast<double>((1UL << ((bps << 3) - 1)) - 1);
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const guint bands = fastspectrum->bands;
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const guint nfft = 2 * bands - 2;
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g_mutex_lock(&fastspectrum->lock);
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GstMapInfo map;
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gst_buffer_map(buffer, &map, GST_MAP_READ);
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const guint8 *data = map.data;
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gsize size = map.size;
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GST_LOG_OBJECT(fastspectrum, "input size: %" G_GSIZE_FORMAT " bytes", size);
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if (GST_BUFFER_IS_DISCONT(buffer)) {
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GST_DEBUG_OBJECT(fastspectrum, "Discontinuity detected -- flushing");
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gst_strawberry_fastspectrum_flush(fastspectrum);
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}
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// If we don't have a FFT context yet (or it was reset due to parameter changes) get one and allocate memory for everything
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if (!fastspectrum->channel_data_initialized) {
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GST_DEBUG_OBJECT(fastspectrum, "allocating for bands %u", bands);
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gst_strawberry_fastspectrum_alloc_channel_data(fastspectrum);
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// Number of sample frames we process before posting a message interval is in ns
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fastspectrum->frames_per_interval = gst_util_uint64_scale(fastspectrum->interval, rate, GST_SECOND);
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fastspectrum->frames_todo = fastspectrum->frames_per_interval;
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// Rounding error for frames_per_interval in ns, aggregated it in accumulated_error
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fastspectrum->error_per_interval = (fastspectrum->interval * rate) % GST_SECOND;
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if (fastspectrum->frames_per_interval == 0) {
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fastspectrum->frames_per_interval = 1;
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}
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GST_INFO_OBJECT(fastspectrum, "interval %" GST_TIME_FORMAT ", fpi %" G_GUINT64_FORMAT ", error %" GST_TIME_FORMAT, GST_TIME_ARGS(fastspectrum->interval), fastspectrum->frames_per_interval, GST_TIME_ARGS(fastspectrum->error_per_interval));
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fastspectrum->input_pos = 0;
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gst_strawberry_fastspectrum_flush(fastspectrum);
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}
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if (fastspectrum->num_frames == 0) {
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fastspectrum->message_ts = GST_BUFFER_TIMESTAMP(buffer);
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}
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guint input_pos = fastspectrum->input_pos;
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GstStrawberryFastSpectrumInputData input_data = fastspectrum->input_data;
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while (size >= bpf) {
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// Run input_data for a chunk of data
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guint64 fft_todo = nfft - (fastspectrum->num_frames % nfft);
|
|
guint64 msg_todo = fastspectrum->frames_todo - fastspectrum->num_frames;
|
|
GST_LOG_OBJECT(fastspectrum, "message frames todo: %lu, fft frames todo: %lu, input frames %" G_GSIZE_FORMAT, msg_todo, fft_todo, (size / bpf));
|
|
guint64 block_size = msg_todo;
|
|
if (block_size > (size / bpf)) {
|
|
block_size = (size / bpf);
|
|
}
|
|
if (block_size > fft_todo) {
|
|
block_size = fft_todo;
|
|
}
|
|
|
|
// Move the current frames into our ringbuffers
|
|
input_data(data, fastspectrum->input_ring_buffer, block_size, max_value, input_pos, nfft);
|
|
|
|
data += block_size * bpf;
|
|
size -= block_size * bpf;
|
|
input_pos = (input_pos + block_size) % nfft;
|
|
fastspectrum->num_frames += block_size;
|
|
|
|
gboolean have_full_interval = (fastspectrum->num_frames == fastspectrum->frames_todo);
|
|
|
|
GST_LOG_OBJECT(fastspectrum, "size: %" G_GSIZE_FORMAT ", do-fft = %d, do-message = %d", size, (fastspectrum->num_frames % nfft == 0), have_full_interval);
|
|
|
|
// If we have enough frames for an FFT or we have all frames required for the interval and we haven't run a FFT, then run an FFT
|
|
if ((fastspectrum->num_frames % nfft == 0) || (have_full_interval && !fastspectrum->num_fft)) {
|
|
gst_strawberry_fastspectrum_run_fft(fastspectrum, input_pos);
|
|
fastspectrum->num_fft++;
|
|
}
|
|
|
|
// Do we have the FFTs for one interval?
|
|
if (have_full_interval) {
|
|
GST_DEBUG_OBJECT(fastspectrum, "nfft: %u frames: %" G_GUINT64_FORMAT " fpi: %" G_GUINT64_FORMAT " error: %" GST_TIME_FORMAT, nfft, fastspectrum->num_frames, fastspectrum->frames_per_interval, GST_TIME_ARGS(fastspectrum->accumulated_error));
|
|
|
|
fastspectrum->frames_todo = fastspectrum->frames_per_interval;
|
|
if (fastspectrum->accumulated_error >= GST_SECOND) {
|
|
fastspectrum->accumulated_error -= GST_SECOND;
|
|
fastspectrum->frames_todo++;
|
|
}
|
|
fastspectrum->accumulated_error += fastspectrum->error_per_interval;
|
|
|
|
if (fastspectrum->output_callback) {
|
|
// Calculate average
|
|
for (guint i = 0; i < fastspectrum->bands; i++) {
|
|
fastspectrum->spect_magnitude[i] /= static_cast<double>(fastspectrum->num_fft);
|
|
}
|
|
|
|
fastspectrum->output_callback(fastspectrum->spect_magnitude, static_cast<int>(fastspectrum->bands));
|
|
|
|
// Reset spectrum accumulators
|
|
memset(fastspectrum->spect_magnitude, 0, fastspectrum->bands * sizeof(double));
|
|
}
|
|
|
|
if (GST_CLOCK_TIME_IS_VALID(fastspectrum->message_ts)) {
|
|
fastspectrum->message_ts += gst_util_uint64_scale(fastspectrum->num_frames, GST_SECOND, rate);
|
|
}
|
|
|
|
fastspectrum->num_frames = 0;
|
|
fastspectrum->num_fft = 0;
|
|
}
|
|
}
|
|
|
|
fastspectrum->input_pos = input_pos;
|
|
|
|
gst_buffer_unmap(buffer, &map);
|
|
g_mutex_unlock(&fastspectrum->lock);
|
|
|
|
g_assert(size == 0);
|
|
|
|
return GST_FLOW_OK;
|
|
|
|
}
|