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Original commit message from CVS: * gst/spectrum/gstspectrum.c: (gst_spectrum_class_init), (gst_spectrum_init), (gst_spectrum_set_sink_caps), (gst_spectrum_get_sink_caps), (gst_spectrum_chain): Use boilerplate macro, fix strings to match plugin-moval-requirements
343 lines
10 KiB
C
343 lines
10 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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* <2006> Stefan Kost <ensonic@users.sf.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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:element-spectrum
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*
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* <refsect2>
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* The Spectrum element analyzes the frequency spectrum of an audio signal.
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* Analysis results are send as outgoing buffers.
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* The buffer contains a guint8 value per frequency band.
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* A value of 0 maps to the threshold property.
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*
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* It cannot be used with the gst-launch command in a sensible way. Instead the
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* included demo shows how to use it.
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*
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* Last reviewed on 2006-05-21 (0.10.3)
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include "gstspectrum.h"
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GST_DEBUG_CATEGORY_STATIC (gst_spectrum_debug);
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#define GST_CAT_DEFAULT gst_spectrum_debug
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/* elementfactory information */
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static const GstElementDetails gst_spectrum_details =
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GST_ELEMENT_DETAILS ("Spectrum analyzer",
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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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static GstStaticPadTemplate sink_template_factory =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("audio/x-raw-int, "
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"rate = (int) [ 1, MAX ], "
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"channels = (int) [1, MAX], "
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"endianness = (int) BYTE_ORDER, "
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"width = (int) 16, " "depth = (int) 16, " "signed = (boolean) true")
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);
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static GstStaticPadTemplate src_template_factory =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS_ANY);
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/* Spectrum signals and args */
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enum
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{
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/* FILL ME */
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LAST_SIGNAL
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};
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enum
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{
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ARG_0,
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ARG_WIDTH,
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ARG_THRESHOLD
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};
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GST_BOILERPLATE (GstSpectrum, gst_spectrum, GstElement, GST_TYPE_ELEMENT);
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static void gst_spectrum_dispose (GObject * object);
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static void gst_spectrum_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static gboolean gst_spectrum_set_sink_caps (GstPad * pad, GstCaps * caps);
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static GstCaps *gst_spectrum_get_sink_caps (GstPad * pad);
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static GstFlowReturn gst_spectrum_chain (GstPad * pad, GstBuffer * buffer);
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static GstStateChangeReturn gst_spectrum_change_state (GstElement * element,
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GstStateChange transition);
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#define fixed short
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extern int gst_spectrum_fix_fft (fixed fr[], fixed fi[], int m, int inverse);
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extern void gst_spectrum_fix_loud (fixed loud[], fixed fr[], fixed fi[], int n,
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int scale_shift);
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extern void gst_spectrum_window (fixed fr[], int n);
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/*static guint gst_spectrum_signals[LAST_SIGNAL] = { 0 }; */
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static void
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gst_spectrum_base_init (gpointer g_class)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&sink_template_factory));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&src_template_factory));
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gst_element_class_set_details (element_class, &gst_spectrum_details);
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}
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static void
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gst_spectrum_class_init (GstSpectrumClass * klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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GstElementClass *element = GST_ELEMENT_CLASS (klass);
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gobject_class->set_property = gst_spectrum_set_property;
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gobject_class->dispose = gst_spectrum_dispose;
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element->change_state = gst_spectrum_change_state;
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g_object_class_install_property (gobject_class, ARG_WIDTH,
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g_param_spec_uint ("width", "Width", "number of frequency bands",
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0, G_MAXUINT, 0, G_PARAM_WRITABLE));
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g_object_class_install_property (gobject_class, ARG_THRESHOLD,
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g_param_spec_int ("threshold", "Threshold",
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"db threshold for result, maps to 0", G_MININT, 0, -60,
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G_PARAM_WRITABLE));
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GST_DEBUG_CATEGORY_INIT (gst_spectrum_debug, "spectrum", 0,
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"audio spectrum analyser element");
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}
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static void
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gst_spectrum_init (GstSpectrum * spectrum, GstSpectrumClass * g_class)
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{
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spectrum->sinkpad =
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gst_pad_new_from_static_template (&sink_template_factory, "sink");
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gst_pad_set_chain_function (spectrum->sinkpad, gst_spectrum_chain);
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gst_pad_set_setcaps_function (spectrum->sinkpad, gst_spectrum_set_sink_caps);
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gst_pad_set_getcaps_function (spectrum->sinkpad, gst_spectrum_get_sink_caps);
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gst_element_add_pad (GST_ELEMENT (spectrum), spectrum->sinkpad);
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spectrum->srcpad =
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gst_pad_new_from_static_template (&src_template_factory, "src");
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gst_element_add_pad (GST_ELEMENT (spectrum), spectrum->srcpad);
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spectrum->adapter = gst_adapter_new ();
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spectrum->width = 128;
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spectrum->base = 9;
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spectrum->len = 1024; /* 2 ^ (base+1) */
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spectrum->loud = g_malloc (spectrum->len * sizeof (gint16));
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spectrum->im = g_malloc (spectrum->len * sizeof (gint16));
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memset (spectrum->im, 0, spectrum->len * sizeof (gint16));
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spectrum->re = g_malloc (spectrum->len * sizeof (gint16));
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memset (spectrum->re, 0, spectrum->len * sizeof (gint16));
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}
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static void
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gst_spectrum_dispose (GObject * object)
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{
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GstSpectrum *spectrum = GST_SPECTRUM (object);
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if (spectrum->adapter) {
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g_object_unref (spectrum->adapter);
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spectrum->adapter = NULL;
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}
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g_free (spectrum->re);
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g_free (spectrum->im);
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g_free (spectrum->loud);
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G_OBJECT_CLASS (parent_class)->dispose (object);
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}
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static void
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gst_spectrum_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstSpectrum *spectrum = GST_SPECTRUM (object);
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switch (prop_id) {
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case ARG_WIDTH:
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spectrum->width = g_value_get_uint (value);
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break;
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case ARG_THRESHOLD:
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spectrum->threshold = g_value_get_int (value);
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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
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gst_spectrum_set_sink_caps (GstPad * pad, GstCaps * caps)
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{
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GstSpectrum *spectrum = GST_SPECTRUM (gst_pad_get_parent (pad));
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GstStructure *structure = gst_caps_get_structure (caps, 0);
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gboolean ret;
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ret = gst_structure_get_int (structure, "channels", &spectrum->channels);
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GST_INFO ("Got channels = %d", spectrum->channels);
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gst_object_unref (spectrum);
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return ret;
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}
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static GstCaps *
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gst_spectrum_get_sink_caps (GstPad * pad)
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{
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GstSpectrum *spectrum = GST_SPECTRUM (gst_pad_get_parent (pad));
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GstCaps *res;
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GstStructure *structure;
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res = gst_caps_copy (gst_pad_get_pad_template_caps (spectrum->sinkpad));
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if (spectrum->channels) {
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structure = gst_caps_get_structure (res, 0);
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gst_structure_set (structure, "channels", G_TYPE_INT, spectrum->channels,
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NULL);
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GST_INFO ("Fixate channels = %d", spectrum->channels);
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}
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gst_object_unref (spectrum);
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return res;
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}
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static GstFlowReturn
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gst_spectrum_chain (GstPad * pad, GstBuffer * buffer)
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{
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GstSpectrum *spectrum = GST_SPECTRUM (gst_pad_get_parent (pad));
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gint16 *samples;
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gint wanted;
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gint i, j, k;
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gint32 acc;
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gfloat pos, step;
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guchar *spect;
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GstBuffer *outbuf;
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GstFlowReturn ret = GST_FLOW_OK;
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gst_adapter_push (spectrum->adapter, buffer);
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/* required number of bytes */
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wanted = spectrum->channels * spectrum->len * 2;
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/* FIXME: 4.0 was 2.0 before, but that include the mirrored spectrum */
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step = (gfloat) spectrum->len / (spectrum->width * 4.0);
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while (gst_adapter_available (spectrum->adapter) > wanted &&
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(ret == GST_FLOW_OK)) {
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samples = (gint16 *) gst_adapter_take (spectrum->adapter, wanted);
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for (i = 0, j = 0; i < spectrum->len; i++) {
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for (k = 0, acc = 0; k < spectrum->channels; k++)
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acc += samples[j++];
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spectrum->re[i] = (gint16) (acc / spectrum->channels);
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}
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gst_spectrum_window (spectrum->re, spectrum->len);
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gst_spectrum_fix_fft (spectrum->re, spectrum->im, spectrum->base, FALSE);
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gst_spectrum_fix_loud (spectrum->loud, spectrum->re, spectrum->im,
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spectrum->len, 0);
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ret = gst_pad_alloc_buffer_and_set_caps (spectrum->srcpad,
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GST_BUFFER_OFFSET_NONE, spectrum->width,
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GST_PAD_CAPS (spectrum->srcpad), &outbuf);
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/* resample to requested width */
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spect = GST_BUFFER_DATA (outbuf);
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for (i = 0, pos = 0.0; i < spectrum->width; i++, pos += step) {
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/* > -60 db? FIXME: make this a gobject property */
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if (spectrum->loud[(gint) pos] > spectrum->threshold) {
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spect[i] = spectrum->loud[(gint) pos] - spectrum->threshold;
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/*
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if (spect[i] > 15);
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spect[i] = 15;
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*/
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} else
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/* treat as silence */
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spect[i] = 0;
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}
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ret = gst_pad_push (spectrum->srcpad, outbuf);
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}
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gst_object_unref (spectrum);
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return ret;
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}
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static GstStateChangeReturn
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gst_spectrum_change_state (GstElement * element, GstStateChange transition)
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{
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GstSpectrum *spectrum = GST_SPECTRUM (element);
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GstStateChangeReturn ret;
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switch (transition) {
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case GST_STATE_CHANGE_NULL_TO_READY:
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break;
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case GST_STATE_CHANGE_READY_TO_PAUSED:
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gst_adapter_clear (spectrum->adapter);
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break;
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case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
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break;
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default:
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break;
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}
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ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
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switch (transition) {
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case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
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break;
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case GST_STATE_CHANGE_PAUSED_TO_READY:
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break;
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case GST_STATE_CHANGE_READY_TO_NULL:
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break;
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default:
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break;
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}
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return ret;
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}
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static gboolean
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plugin_init (GstPlugin * plugin)
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{
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return gst_element_register (plugin, "spectrum", GST_RANK_NONE,
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GST_TYPE_SPECTRUM);
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}
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GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
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GST_VERSION_MINOR,
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"spectrum",
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"Run an FFT on the audio signal, output spectrum data",
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plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
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