author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 06 Jul 2010 14:35:10 +0300 | |
changeset 23 | 29ecd5cb86b3 |
parent 8 | 4a7fac7dd34a |
permissions | -rw-r--r-- |
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/* |
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* GStreamer |
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* Copyright (C) 2009 Sebastian Dröge <sebastian.droege@collabora.co.uk> |
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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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|
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/** |
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* SECTION:element-audiofirfilter |
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* |
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* audiofirfilter implements a generic audio <ulink url="http://en.wikipedia.org/wiki/Finite_impulse_response">FIR filter</ulink>. Before usage the |
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* "kernel" property has to be set to the filter kernel that should be |
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* used and the "latency" property has to be set to the latency (in samples) |
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* that is introduced by the filter kernel. Setting a latency of n samples |
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* will lead to the first n samples being dropped from the output and |
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* n samples added to the end. |
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* |
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* The filter kernel describes the impulse response of the filter. To |
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* calculate the frequency response of the filter you have to calculate |
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* the Fourier Transform of the impulse response. |
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* |
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* To change the filter kernel whenever the sampling rate changes the |
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* "rate-changed" signal can be used. This should be done for most |
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* FIR filters as they're depending on the sampling rate. |
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* |
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* <refsect2> |
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* <title>Example application</title> |
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* |[ |
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* <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" parse="text" href="../../../../tests/examples/audiofx/firfilter-example.c" /> |
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* ]| |
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* </refsect2> |
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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 <math.h> |
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#include <gst/gst.h> |
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#include <gst/audio/gstaudiofilter.h> |
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#include <gst/controller/gstcontroller.h> |
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#include "audiofirfilter.h" |
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#define GST_CAT_DEFAULT gst_audio_fir_filter_debug |
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GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT); |
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enum |
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{ |
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SIGNAL_RATE_CHANGED, |
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LAST_SIGNAL |
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}; |
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enum |
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{ |
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PROP_0, |
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PROP_KERNEL, |
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PROP_LATENCY |
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}; |
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static guint gst_audio_fir_filter_signals[LAST_SIGNAL] = { 0, }; |
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#define DEBUG_INIT(bla) \ |
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GST_DEBUG_CATEGORY_INIT (gst_audio_fir_filter_debug, "audiofirfilter", 0, \ |
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"Generic audio FIR filter plugin"); |
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GST_BOILERPLATE_FULL (GstAudioFIRFilter, gst_audio_fir_filter, GstAudioFilter, |
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GST_TYPE_AUDIO_FX_BASE_FIR_FILTER, DEBUG_INIT); |
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static void gst_audio_fir_filter_set_property (GObject * object, guint prop_id, |
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const GValue * value, GParamSpec * pspec); |
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static void gst_audio_fir_filter_get_property (GObject * object, guint prop_id, |
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GValue * value, GParamSpec * pspec); |
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static void gst_audio_fir_filter_finalize (GObject * object); |
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static gboolean gst_audio_fir_filter_setup (GstAudioFilter * base, |
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GstRingBufferSpec * format); |
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/* Element class */ |
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static void |
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gst_audio_fir_filter_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_set_details_simple (element_class, |
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101 |
"Audio FIR filter", "Filter/Effect/Audio", |
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102 |
"Generic audio FIR filter with custom filter kernel", |
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103 |
"Sebastian Dröge <sebastian.droege@collabora.co.uk>"); |
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} |
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105 |
|
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106 |
static void |
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gst_audio_fir_filter_class_init (GstAudioFIRFilterClass * klass) |
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108 |
{ |
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GObjectClass *gobject_class = (GObjectClass *) klass; |
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GstAudioFilterClass *filter_class = (GstAudioFilterClass *) klass; |
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111 |
|
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gobject_class->set_property = gst_audio_fir_filter_set_property; |
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gobject_class->get_property = gst_audio_fir_filter_get_property; |
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gobject_class->finalize = gst_audio_fir_filter_finalize; |
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115 |
|
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116 |
g_object_class_install_property (gobject_class, PROP_KERNEL, |
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g_param_spec_value_array ("kernel", "Filter Kernel", |
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118 |
"Filter kernel for the FIR filter", |
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g_param_spec_double ("Element", "Filter Kernel Element", |
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"Element of the filter kernel", -G_MAXDOUBLE, G_MAXDOUBLE, 0.0, |
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS), |
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); |
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g_object_class_install_property (gobject_class, PROP_LATENCY, |
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124 |
g_param_spec_uint64 ("latency", "Latecy", |
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125 |
"Filter latency in samples", |
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0, G_MAXUINT64, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); |
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127 |
|
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filter_class->setup = GST_DEBUG_FUNCPTR (gst_audio_fir_filter_setup); |
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129 |
|
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130 |
/** |
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131 |
* GstAudioFIRFilter::rate-changed: |
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* @filter: the filter on which the signal is emitted |
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* @rate: the new sampling rate |
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134 |
* |
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* Will be emitted when the sampling rate changes. The callbacks |
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* will be called from the streaming thread and processing will |
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* stop until the event is handled. |
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*/ |
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gst_audio_fir_filter_signals[SIGNAL_RATE_CHANGED] = |
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g_signal_new ("rate-changed", G_TYPE_FROM_CLASS (klass), |
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141 |
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstAudioFIRFilterClass, rate_changed), |
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142 |
NULL, NULL, gst_marshal_VOID__INT, G_TYPE_NONE, 1, G_TYPE_INT); |
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143 |
} |
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144 |
|
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145 |
static void |
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146 |
gst_audio_fir_filter_update_kernel (GstAudioFIRFilter * self, GValueArray * va) |
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147 |
{ |
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gdouble *kernel; |
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149 |
guint i; |
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150 |
|
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gst_audio_fx_base_fir_filter_push_residue (GST_AUDIO_FX_BASE_FIR_FILTER |
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(self)); |
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153 |
|
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154 |
if (va) { |
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if (self->kernel) |
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g_value_array_free (self->kernel); |
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157 |
|
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self->kernel = va; |
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} |
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160 |
|
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kernel = g_new (gdouble, self->kernel->n_values); |
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162 |
|
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for (i = 0; i < self->kernel->n_values; i++) { |
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GValue *v = g_value_array_get_nth (self->kernel, i); |
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kernel[i] = g_value_get_double (v); |
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166 |
} |
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167 |
|
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gst_audio_fx_base_fir_filter_set_kernel (GST_AUDIO_FX_BASE_FIR_FILTER (self), |
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kernel, self->kernel->n_values, self->latency); |
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170 |
} |
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171 |
|
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172 |
static void |
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173 |
gst_audio_fir_filter_init (GstAudioFIRFilter * self, |
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GstAudioFIRFilterClass * g_class) |
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175 |
{ |
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GValue v = { 0, }; |
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GValueArray *va; |
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178 |
|
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self->latency = 0; |
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va = g_value_array_new (1); |
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181 |
|
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g_value_init (&v, G_TYPE_DOUBLE); |
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g_value_set_double (&v, 1.0); |
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g_value_array_append (va, &v); |
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g_value_unset (&v); |
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gst_audio_fir_filter_update_kernel (self, va); |
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187 |
|
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self->lock = g_mutex_new (); |
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189 |
} |
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190 |
|
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191 |
/* GstAudioFilter vmethod implementations */ |
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192 |
|
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/* get notified of caps and plug in the correct process function */ |
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static gboolean |
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gst_audio_fir_filter_setup (GstAudioFilter * base, GstRingBufferSpec * format) |
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196 |
{ |
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197 |
GstAudioFIRFilter *self = GST_AUDIO_FIR_FILTER (base); |
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198 |
|
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199 |
if (self->rate != format->rate) { |
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g_signal_emit (G_OBJECT (self), |
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|
201 |
gst_audio_fir_filter_signals[SIGNAL_RATE_CHANGED], 0, format->rate); |
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202 |
self->rate = format->rate; |
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203 |
} |
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|
204 |
|
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205 |
return GST_AUDIO_FILTER_CLASS (parent_class)->setup (base, format); |
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206 |
} |
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|
207 |
|
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208 |
static void |
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209 |
gst_audio_fir_filter_finalize (GObject * object) |
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210 |
{ |
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211 |
GstAudioFIRFilter *self = GST_AUDIO_FIR_FILTER (object); |
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|
212 |
|
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213 |
g_mutex_free (self->lock); |
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self->lock = NULL; |
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215 |
|
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216 |
if (self->kernel) |
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217 |
g_value_array_free (self->kernel); |
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self->kernel = NULL; |
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219 |
|
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G_OBJECT_CLASS (parent_class)->finalize (object); |
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221 |
} |
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|
222 |
|
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223 |
static void |
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224 |
gst_audio_fir_filter_set_property (GObject * object, guint prop_id, |
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225 |
const GValue * value, GParamSpec * pspec) |
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226 |
{ |
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227 |
GstAudioFIRFilter *self = GST_AUDIO_FIR_FILTER (object); |
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|
228 |
|
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229 |
g_return_if_fail (GST_IS_AUDIO_FIR_FILTER (self)); |
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|
230 |
|
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231 |
switch (prop_id) { |
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232 |
case PROP_KERNEL: |
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233 |
g_mutex_lock (self->lock); |
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234 |
gst_audio_fx_base_fir_filter_push_residue (GST_AUDIO_FX_BASE_FIR_FILTER |
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235 |
(self)); |
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|
236 |
|
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237 |
gst_audio_fir_filter_update_kernel (self, g_value_dup_boxed (value)); |
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|
238 |
g_mutex_unlock (self->lock); |
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|
239 |
break; |
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|
240 |
case PROP_LATENCY: |
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|
241 |
g_mutex_lock (self->lock); |
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|
242 |
self->latency = g_value_get_uint64 (value); |
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|
243 |
gst_audio_fir_filter_update_kernel (self, NULL); |
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|
244 |
g_mutex_unlock (self->lock); |
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|
245 |
break; |
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|
246 |
default: |
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|
247 |
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); |
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|
248 |
break; |
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|
249 |
} |
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|
250 |
} |
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|
251 |
|
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252 |
static void |
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|
253 |
gst_audio_fir_filter_get_property (GObject * object, guint prop_id, |
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|
254 |
GValue * value, GParamSpec * pspec) |
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|
255 |
{ |
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|
256 |
GstAudioFIRFilter *self = GST_AUDIO_FIR_FILTER (object); |
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|
257 |
|
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|
258 |
switch (prop_id) { |
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|
259 |
case PROP_KERNEL: |
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|
260 |
g_value_set_boxed (value, self->kernel); |
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|
261 |
break; |
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|
262 |
case PROP_LATENCY: |
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|
263 |
g_value_set_uint64 (value, self->latency); |
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Revision: 201011
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|
264 |
break; |
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Revision: 201011
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|
265 |
default: |
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|
266 |
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); |
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diff
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|
267 |
break; |
4a7fac7dd34a
Revision: 201011
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parents:
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|
268 |
} |
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Revision: 201011
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parents:
diff
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|
269 |
} |