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gst/filter/gstbpwsinc.*: Apply the same changes to the bandpass filter:
Original commit message from CVS: * gst/filter/gstbpwsinc.c: (gst_bpwsinc_class_init), (gst_bpwsinc_init), (process_32), (process_64), (bpwsinc_build_kernel), (bpwsinc_setup), (bpwsinc_get_unit_size), (bpwsinc_transform), (bpwsinc_set_property), (bpwsinc_get_property): * gst/filter/gstbpwsinc.h: Apply the same changes to the bandpass filter: - Support double input - Fix processing for input with >1 channels - Specify frequency in Hz - Specify actual filter kernel length - Use transform instead of transform_ip as we're working out of place anyway - Factor out filter kernel generation and update the filter kernel when the properties are set Fix bandpass filter kernel generation to actually generate a bandpass filter by creating a highpass instead of a second lowpass. * gst/filter/gstlpwsinc.c: (gst_lpwsinc_class_init): Small formatting fix.
This commit is contained in:
Sebastian Dröge
parent
11131b7a44
commit
ec97d67741
4 changed files with 277 additions and 150 deletions
23
ChangeLog
23
ChangeLog
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@ -1,3 +1,26 @@
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2007-08-10 Sebastian Dröge <slomo@circular-chaos.org>
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* gst/filter/gstbpwsinc.c: (gst_bpwsinc_class_init),
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(gst_bpwsinc_init), (process_32), (process_64),
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(bpwsinc_build_kernel), (bpwsinc_setup), (bpwsinc_get_unit_size),
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(bpwsinc_transform), (bpwsinc_set_property),
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(bpwsinc_get_property):
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* gst/filter/gstbpwsinc.h:
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Apply the same changes to the bandpass filter:
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- Support double input
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- Fix processing for input with >1 channels
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- Specify frequency in Hz
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- Specify actual filter kernel length
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- Use transform instead of transform_ip as we're working
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out of place anyway
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- Factor out filter kernel generation and update the filter
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kernel when the properties are set
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Fix bandpass filter kernel generation to actually generate
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a bandpass filter by creating a highpass instead of a second
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lowpass.
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* gst/filter/gstlpwsinc.c: (gst_lpwsinc_class_init):
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Small formatting fix.
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2007-08-10 Sebastian Dröge <slomo@circular-chaos.org>
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* gst/filter/gstlpwsinc.c: (gst_lpwsinc_class_init),
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@ -3,6 +3,7 @@
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* GStreamer
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* Copyright (C) 1999-2001 Erik Walthinsen <omega@cse.ogi.edu>
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* 2006 Dreamlab Technologies Ltd. <mathis.hofer@dreamlab.net>
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* 2007 Sebastian Dröge <slomo@circular-chaos.org>
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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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@ -30,9 +31,6 @@
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* is probably the bottleneck
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* - Implement a band reject mode (spectral inversion)
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* - Allow choosing between different windows (blackman, hanning, ...)
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* - Specify filter length instead of 2*N+1
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* FIXME: - Doesn't work at all with >1 channels
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* - Is bandreject, not bandpass
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*/
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#ifdef HAVE_CONFIG_H
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@ -56,7 +54,8 @@ GST_ELEMENT_DETAILS ("Band-pass Windowed sinc filter",
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"Band-pass Windowed sinc filter",
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"Thomas <thomas@apestaart.org>, "
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"Steven W. Smith, "
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"Dreamlab Technologies Ltd. <mathis.hofer@dreamlab.net>");
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"Dreamlab Technologies Ltd. <mathis.hofer@dreamlab.net>, "
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"Sebastian Dröge <slomo@circular-chaos.org>");
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/* Filter signals and args */
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enum
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@ -74,11 +73,11 @@ enum
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};
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#define ALLOWED_CAPS \
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"audio/x-raw-float," \
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" width = (int) 32, " \
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" endianness = (int) BYTE_ORDER," \
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" rate = (int) [ 1, MAX ]," \
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" channels = (int) [ 1, MAX ]"
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"audio/x-raw-float, " \
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" width = (int) { 32, 64 }, " \
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" endianness = (int) BYTE_ORDER, " \
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" rate = (int) [ 1, MAX ], " \
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" channels = (int) [ 1, MAX ] "
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#define DEBUG_INIT(bla) \
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GST_DEBUG_CATEGORY_INIT (gst_bpwsinc_debug, "bpwsinc", 0, "Band-pass Windowed sinc filter plugin");
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@ -91,8 +90,10 @@ static void bpwsinc_set_property (GObject * object, guint prop_id,
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static void bpwsinc_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static GstFlowReturn bpwsinc_transform_ip (GstBaseTransform * base,
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GstBuffer * outbuf);
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static GstFlowReturn bpwsinc_transform (GstBaseTransform * base,
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GstBuffer * inbuf, GstBuffer * outbuf);
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static gboolean bpwsinc_get_unit_size (GstBaseTransform * base, GstCaps * caps,
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guint * size);
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static gboolean bpwsinc_setup (GstAudioFilter * base,
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GstRingBufferSpec * format);
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@ -145,31 +146,197 @@ gst_bpwsinc_class_init (GstBPWSincClass * klass)
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g_object_class_install_property (gobject_class, PROP_LOWER_FREQUENCY,
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g_param_spec_double ("lower-frequency", "Lower Frequency",
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"Cut-off lower frequency (relative to sample rate)",
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0.0, 0.5, 0, G_PARAM_READWRITE));
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"Cut-off lower frequency (Hz)",
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0.0, G_MAXDOUBLE, 0, G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class, PROP_UPPER_FREQUENCY,
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g_param_spec_double ("upper-frequency", "Upper Frequency",
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"Cut-off upper frequency (relative to sample rate)",
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0.0, 0.5, 0, G_PARAM_READWRITE));
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"Cut-off upper frequency (Hz)",
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0.0, G_MAXDOUBLE, 0, G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class, PROP_LENGTH,
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g_param_spec_int ("length", "Length",
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"N such that the filter length = 2N + 1",
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1, G_MAXINT, 1, G_PARAM_READWRITE));
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"Filter kernel length, will be rounded to the next odd number",
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3, G_MAXINT, 101, G_PARAM_READWRITE));
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trans_class->transform_ip = GST_DEBUG_FUNCPTR (bpwsinc_transform_ip);
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trans_class->transform = GST_DEBUG_FUNCPTR (bpwsinc_transform);
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trans_class->get_unit_size = GST_DEBUG_FUNCPTR (bpwsinc_get_unit_size);
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GST_AUDIO_FILTER_CLASS (klass)->setup = GST_DEBUG_FUNCPTR (bpwsinc_setup);
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}
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static void
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gst_bpwsinc_init (GstBPWSinc * self, GstBPWSincClass * g_class)
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{
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self->wing_size = 50;
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self->lower_frequency = 0.25;
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self->upper_frequency = 0.3;
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self->kernel_length = 101;
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self->lower_frequency = 0.0;
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self->upper_frequency = 0.0;
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self->kernel = NULL;
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self->have_kernel = FALSE;
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self->residue = NULL;
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}
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static void
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process_32 (GstBPWSinc * self, gfloat * src, gfloat * dst, guint input_samples)
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{
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gint kernel_length = self->kernel_length;
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gint i, j, k, l;
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gint channels = GST_AUDIO_FILTER (self)->format.channels;
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/* convolution */
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for (i = 0; i < input_samples; i++) {
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dst[i] = 0.0;
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k = i % channels;
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l = i / channels;
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for (j = 0; j < kernel_length; j++)
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if (l < j)
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dst[i] +=
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self->residue[(kernel_length + l - j) * channels +
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k] * self->kernel[j];
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else
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dst[i] += src[(l - j) * channels + k] * self->kernel[j];
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}
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/* copy the tail of the current input buffer to the residue */
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for (i = 0; i < kernel_length * channels; i++)
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self->residue[i] = src[input_samples - kernel_length * channels + i];
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}
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static void
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process_64 (GstBPWSinc * self, gdouble * src, gdouble * dst,
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guint input_samples)
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{
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gint kernel_length = self->kernel_length;
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gint i, j, k, l;
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gint channels = GST_AUDIO_FILTER (self)->format.channels;
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/* convolution */
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for (i = 0; i < input_samples; i++) {
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dst[i] = 0.0;
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k = i % channels;
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l = i / channels;
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for (j = 0; j < kernel_length; j++)
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if (l < j)
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dst[i] +=
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self->residue[(kernel_length + l - j) * channels +
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k] * self->kernel[j];
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else
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dst[i] += src[(l - j) * channels + k] * self->kernel[j];
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}
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/* copy the tail of the current input buffer to the residue */
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for (i = 0; i < kernel_length * channels; i++)
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self->residue[i] = src[input_samples - kernel_length * channels + i];
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}
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static void
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bpwsinc_build_kernel (GstBPWSinc * self)
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{
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gint i = 0;
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gdouble sum = 0.0;
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gint len = 0;
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gdouble *kernel_lp, *kernel_hp;
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gdouble w;
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len = self->kernel_length;
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if (GST_AUDIO_FILTER (self)->format.rate == 0) {
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GST_DEBUG ("rate not set yet");
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return;
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}
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if (GST_AUDIO_FILTER (self)->format.channels == 0) {
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GST_DEBUG ("channels not set yet");
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return;
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}
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/* Clamp frequencies */
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self->lower_frequency =
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CLAMP (self->lower_frequency, 0.0,
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GST_AUDIO_FILTER (self)->format.rate / 2);
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self->upper_frequency =
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CLAMP (self->upper_frequency, 0.0,
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GST_AUDIO_FILTER (self)->format.rate / 2);
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if (self->lower_frequency > self->upper_frequency) {
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gint tmp = self->lower_frequency;
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self->lower_frequency = self->upper_frequency;
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self->upper_frequency = tmp;
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}
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/* fill the lp kernel */
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GST_DEBUG ("bpwsinc: initializing LP kernel of length %d with cut-off %f",
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len, self->lower_frequency);
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w = 2 * M_PI * (self->lower_frequency / GST_AUDIO_FILTER (self)->format.rate);
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kernel_lp = g_new (gdouble, len);
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for (i = 0; i < len; ++i) {
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if (i == len / 2)
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kernel_lp[i] = w;
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else
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kernel_lp[i] = sin (w * (i - len / 2))
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/ (i - len / 2);
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/* Blackman windowing */
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kernel_lp[i] *= (0.42 - 0.5 * cos (2 * M_PI * i / len)
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+ 0.08 * cos (4 * M_PI * i / len));
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}
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/* normalize for unity gain at DC */
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sum = 0.0;
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for (i = 0; i < len; ++i)
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sum += kernel_lp[i];
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for (i = 0; i < len; ++i)
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kernel_lp[i] /= sum;
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/* fill the hp kernel */
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GST_DEBUG ("bpwsinc: initializing HP kernel of length %d with cut-off %f",
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len, self->upper_frequency);
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w = 2 * M_PI * (self->upper_frequency / GST_AUDIO_FILTER (self)->format.rate);
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kernel_hp = g_new (gdouble, len);
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for (i = 0; i < len; ++i) {
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if (i == len / 2)
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kernel_hp[i] = w;
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else
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kernel_hp[i] = sin (w * (i - len / 2))
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/ (i - len / 2);
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/* Blackman windowing */
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kernel_hp[i] *= (0.42 - 0.5 * cos (2 * M_PI * i / len)
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+ 0.08 * cos (4 * M_PI * i / len));
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}
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/* normalize for unity gain at DC */
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sum = 0.0;
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for (i = 0; i < len; ++i)
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sum += kernel_hp[i];
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for (i = 0; i < len; ++i)
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kernel_hp[i] /= sum;
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/* do spectral inversion to go from lowpass to highpass */
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for (i = 0; i < len; ++i)
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kernel_hp[i] = -kernel_hp[i];
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kernel_hp[len / 2] += 1;
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/* combine the two kernels */
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if (self->kernel)
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g_free (self->kernel);
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self->kernel = g_new (gdouble, len);
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for (i = 0; i < len; ++i)
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self->kernel[i] = kernel_lp[i] + kernel_hp[i];
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/* free the helper kernels */
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g_free (kernel_lp);
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g_free (kernel_hp);
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/* do spectral inversion to go from bandreject to bandpass */
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for (i = 0; i < len; ++i)
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self->kernel[i] = -self->kernel[i];
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self->kernel[len / 2] += 1;
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/* set up the residue memory space */
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if (self->residue)
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g_free (self->residue);
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self->residue = g_new0 (gdouble, len);
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}
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/* GstAudioFilter vmethod implementations */
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@ -177,101 +344,50 @@ gst_bpwsinc_init (GstBPWSinc * self, GstBPWSincClass * g_class)
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static gboolean
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bpwsinc_setup (GstAudioFilter * base, GstRingBufferSpec * format)
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{
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int i = 0;
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double sum = 0.0;
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int len = 0;
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double *kernel_lp, *kernel_hp;
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GstBPWSinc *self = GST_BPWSINC (base);
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len = self->wing_size;
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/* fill the lp kernel
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* FIXME: refactor to own function, this is not caps related
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*/
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GST_DEBUG ("bpwsinc: initializing LP kernel of length %d with cut-off %f",
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len * 2 + 1, self->lower_frequency);
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kernel_lp = (double *) g_malloc (sizeof (double) * (2 * len + 1));
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for (i = 0; i <= len * 2; ++i) {
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if (i == len)
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kernel_lp[i] = 2 * M_PI * self->lower_frequency;
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else
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kernel_lp[i] = sin (2 * M_PI * self->lower_frequency * (i - len))
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/ (i - len);
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/* Blackman windowing */
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kernel_lp[i] *= (0.42 - 0.5 * cos (M_PI * i / len)
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+ 0.08 * cos (2 * M_PI * i / len));
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}
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gboolean ret = TRUE;
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/* normalize for unity gain at DC */
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sum = 0.0;
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for (i = 0; i <= len * 2; ++i)
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sum += kernel_lp[i];
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for (i = 0; i <= len * 2; ++i)
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kernel_lp[i] /= sum;
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if (format->width == 32)
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self->process = (GstBPWSincProcessFunc) process_32;
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else if (format->width == 64)
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self->process = (GstBPWSincProcessFunc) process_64;
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else
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ret = FALSE;
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/* fill the hp kernel */
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GST_DEBUG ("bpwsinc: initializing HP kernel of length %d with cut-off %f",
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len * 2 + 1, self->upper_frequency);
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kernel_hp = (double *) g_malloc (sizeof (double) * (2 * len + 1));
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for (i = 0; i <= len * 2; ++i) {
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if (i == len)
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kernel_hp[i] = 2 * M_PI * self->upper_frequency;
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else
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kernel_hp[i] = sin (2 * M_PI * self->upper_frequency * (i - len))
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/ (i - len);
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/* Blackman windowing */
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kernel_hp[i] *= (0.42 - 0.5 * cos (M_PI * i / len)
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+ 0.08 * cos (2 * M_PI * i / len));
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}
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/* normalize for unity gain at DC */
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sum = 0.0;
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for (i = 0; i <= len * 2; ++i)
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sum += kernel_hp[i];
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for (i = 0; i <= len * 2; ++i)
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kernel_hp[i] /= sum;
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/* combine the two kernels */
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if (self->kernel)
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g_free (self->kernel);
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self->kernel = (double *) g_malloc (sizeof (double) * (2 * len + 1));
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for (i = 0; i <= len * 2; ++i)
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self->kernel[i] = kernel_lp[i] + kernel_hp[i];
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/* do spectral inversion to go from band reject to bandpass */
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for (i = 0; i <= len * 2; ++i)
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self->kernel[i] = -self->kernel[i];
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self->kernel[len] += 1;
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/* free the helper kernels */
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g_free (kernel_lp);
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g_free (kernel_hp);
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/* set up the residue memory space */
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if (self->residue)
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g_free (self->residue);
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self->residue = (gfloat *) g_malloc (sizeof (gfloat) * (len * 2 + 1));
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for (i = 0; i <= len * 2; ++i)
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self->residue[i] = 0.0;
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self->have_kernel = FALSE;
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return TRUE;
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}
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/* GstBaseTransform vmethod implementations */
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static gboolean
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bpwsinc_get_unit_size (GstBaseTransform * base, GstCaps * caps, guint * size)
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{
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gint width, channels;
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GstStructure *structure;
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gboolean ret;
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g_assert (size);
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structure = gst_caps_get_structure (caps, 0);
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ret = gst_structure_get_int (structure, "width", &width);
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ret &= gst_structure_get_int (structure, "channels", &channels);
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*size = width * channels / 8;
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return ret;
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}
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static GstFlowReturn
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bpwsinc_transform_ip (GstBaseTransform * base, GstBuffer * outbuf)
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bpwsinc_transform (GstBaseTransform * base, GstBuffer * inbuf,
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GstBuffer * outbuf)
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{
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GstBPWSinc *self = GST_BPWSINC (base);
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GstClockTime timestamp;
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gfloat *src;
|
||||
gfloat *input;
|
||||
int residue_samples;
|
||||
gint input_samples;
|
||||
gint total_samples;
|
||||
int i, j;
|
||||
gint input_samples =
|
||||
GST_BUFFER_SIZE (outbuf) / (GST_AUDIO_FILTER (self)->format.width / 8);
|
||||
|
||||
/* don't process data in passthrough-mode */
|
||||
if (gst_base_transform_is_passthrough (base))
|
||||
|
|
@ -283,38 +399,11 @@ bpwsinc_transform_ip (GstBaseTransform * base, GstBuffer * outbuf)
|
|||
if (GST_CLOCK_TIME_IS_VALID (timestamp))
|
||||
gst_object_sync_values (G_OBJECT (self), timestamp);
|
||||
|
||||
/* FIXME: out of laziness, we copy the left-over bit from last buffer
|
||||
* together with the incoming buffer to a new buffer to make the loop
|
||||
* easy; self could be a lot more optimized though
|
||||
* to make amends we keep the incoming buffer around and write our
|
||||
* output samples there */
|
||||
if (!self->have_kernel)
|
||||
bpwsinc_build_kernel (self);
|
||||
|
||||
src = (gfloat *) GST_BUFFER_DATA (outbuf);
|
||||
residue_samples = self->wing_size * 2 + 1;
|
||||
input_samples = GST_BUFFER_SIZE (outbuf) / sizeof (gfloat);
|
||||
total_samples = residue_samples + input_samples;
|
||||
|
||||
input = (gfloat *) g_malloc (sizeof (gfloat) * total_samples);
|
||||
|
||||
/* copy the left-over bit */
|
||||
memcpy (input, self->residue, sizeof (gfloat) * residue_samples);
|
||||
|
||||
/* copy the new buffer */
|
||||
memcpy (&input[residue_samples], src, sizeof (gfloat) * input_samples);
|
||||
/* copy the tail of the current input buffer to the residue */
|
||||
memcpy (self->residue, &src[input_samples - residue_samples],
|
||||
sizeof (gfloat) * residue_samples);
|
||||
|
||||
/* convolution */
|
||||
/* since we copied the previous set of samples we needed before the actual
|
||||
* input data, we need to add the filter length to our indices for input */
|
||||
for (i = 0; i < input_samples; ++i) {
|
||||
src[i] = 0.0;
|
||||
for (j = 0; j < residue_samples; ++j)
|
||||
src[i] += input[i - j + residue_samples] * self->kernel[j];
|
||||
}
|
||||
|
||||
g_free (input);
|
||||
self->process (self, GST_BUFFER_DATA (inbuf), GST_BUFFER_DATA (outbuf),
|
||||
input_samples);
|
||||
|
||||
return GST_FLOW_OK;
|
||||
}
|
||||
|
|
@ -328,14 +417,29 @@ bpwsinc_set_property (GObject * object, guint prop_id, const GValue * value,
|
|||
g_return_if_fail (GST_IS_BPWSINC (self));
|
||||
|
||||
switch (prop_id) {
|
||||
case PROP_LENGTH:
|
||||
self->wing_size = g_value_get_int (value);
|
||||
case PROP_LENGTH:{
|
||||
gint val;
|
||||
|
||||
GST_BASE_TRANSFORM_LOCK (self);
|
||||
val = g_value_get_int (value);
|
||||
if (val % 2 == 0)
|
||||
val++;
|
||||
self->kernel_length = val;
|
||||
bpwsinc_build_kernel (self);
|
||||
GST_BASE_TRANSFORM_UNLOCK (self);
|
||||
break;
|
||||
}
|
||||
case PROP_LOWER_FREQUENCY:
|
||||
GST_BASE_TRANSFORM_LOCK (self);
|
||||
self->lower_frequency = g_value_get_double (value);
|
||||
bpwsinc_build_kernel (self);
|
||||
GST_BASE_TRANSFORM_UNLOCK (self);
|
||||
break;
|
||||
case PROP_UPPER_FREQUENCY:
|
||||
GST_BASE_TRANSFORM_LOCK (self);
|
||||
self->upper_frequency = g_value_get_double (value);
|
||||
bpwsinc_build_kernel (self);
|
||||
GST_BASE_TRANSFORM_UNLOCK (self);
|
||||
break;
|
||||
default:
|
||||
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
||||
|
|
@ -351,7 +455,7 @@ bpwsinc_get_property (GObject * object, guint prop_id, GValue * value,
|
|||
|
||||
switch (prop_id) {
|
||||
case PROP_LENGTH:
|
||||
g_value_set_int (value, self->wing_size);
|
||||
g_value_set_int (value, self->kernel_length);
|
||||
break;
|
||||
case PROP_LOWER_FREQUENCY:
|
||||
g_value_set_double (value, self->lower_frequency);
|
||||
|
|
|
|||
|
|
@ -25,10 +25,6 @@
|
|||
* chapter 16
|
||||
* available at http://www.dspguide.com/
|
||||
*
|
||||
* FIXME:
|
||||
* - this filter is totally unoptimized !
|
||||
* - we do not destroy the allocated memory for filters and residue
|
||||
* - this might be improved upon with bytestream
|
||||
*/
|
||||
|
||||
#ifndef __GST_BPWSINC_H__
|
||||
|
|
@ -54,6 +50,8 @@ G_BEGIN_DECLS
|
|||
typedef struct _GstBPWSinc GstBPWSinc;
|
||||
typedef struct _GstBPWSincClass GstBPWSincClass;
|
||||
|
||||
typedef void (*GstBPWSincProcessFunc) (GstBPWSinc *, guint8 *, guint8 *, guint);
|
||||
|
||||
/**
|
||||
* GstBPWSinc:
|
||||
*
|
||||
|
|
@ -62,13 +60,15 @@ typedef struct _GstBPWSincClass GstBPWSincClass;
|
|||
struct _GstBPWSinc {
|
||||
GstAudioFilter element;
|
||||
|
||||
double frequency;
|
||||
double lower_frequency, upper_frequency;
|
||||
int wing_size; /* length of a "wing" of the filter;
|
||||
actual length is 2 * wing_size + 1 */
|
||||
GstBPWSincProcessFunc process;
|
||||
|
||||
gfloat *residue; /* buffer for left-over samples from previous buffer */
|
||||
double *kernel;
|
||||
gdouble frequency;
|
||||
gdouble lower_frequency, upper_frequency;
|
||||
gint kernel_length; /* length of the filter kernel */
|
||||
|
||||
gdouble *residue; /* buffer for left-over samples from previous buffer */
|
||||
gdouble *kernel;
|
||||
gboolean have_kernel;
|
||||
};
|
||||
|
||||
struct _GstBPWSincClass {
|
||||
|
|
|
|||
|
|
@ -126,10 +126,10 @@ gst_lpwsinc_window_get_type (void)
|
|||
|
||||
|
||||
#define ALLOWED_CAPS \
|
||||
"audio/x-raw-float," \
|
||||
"audio/x-raw-float, " \
|
||||
" width = (int) { 32, 64 }, " \
|
||||
" endianness = (int) BYTE_ORDER," \
|
||||
" rate = (int) [ 1, MAX ]," \
|
||||
" endianness = (int) BYTE_ORDER, " \
|
||||
" rate = (int) [ 1, MAX ], " \
|
||||
" channels = (int) [ 1, MAX ]"
|
||||
|
||||
#define DEBUG_INIT(bla) \
|
||||
|
|
@ -199,7 +199,7 @@ gst_lpwsinc_class_init (GstLPWSincClass * klass)
|
|||
|
||||
g_object_class_install_property (gobject_class, PROP_FREQUENCY,
|
||||
g_param_spec_double ("frequency", "Frequency",
|
||||
"Cut-off Frequency", 0.0, G_MAXDOUBLE, 0.0,
|
||||
"Cut-off Frequency (Hz)", 0.0, G_MAXDOUBLE, 0.0,
|
||||
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
|
||||
|
||||
g_object_class_install_property (gobject_class, PROP_LENGTH,
|
||||
|
|
|
|||
Loading…
Reference in a new issue