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707b0ffcd6
This was a copy'n'paste buf in the initial commit done by myself.
318 lines
9 KiB
C
318 lines
9 KiB
C
/* GStreamer
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* Copyright (C) <2011> Stefan Kost <ensonic@users.sf.net>
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*
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* gstsynaescope.c: frequency spectrum scope
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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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/**
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* SECTION:element-synaescope
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* @see_also: goom
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*
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* Synaescope is an audio visualisation element. It analyzes frequencies and
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* out-of phase properties of audio and draws this as clouds of stars.
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*
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* <refsect2>
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* <title>Example launch line</title>
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* |[
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* gst-launch audiotestsrc ! audioconvert ! synaescope ! ximagesink
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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 "gstsynaescope.h"
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static GstStaticPadTemplate gst_synae_scope_src_template =
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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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#if G_BYTE_ORDER == G_BIG_ENDIAN
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GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("xRGB"))
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#else
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GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("BGRx"))
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#endif
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);
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static GstStaticPadTemplate gst_synae_scope_sink_template =
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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, "
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"format = (string) " GST_AUDIO_NE (S16) ", "
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"layout = (string) interleaved, "
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"rate = (int) [ 8000, 96000 ], "
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"channels = (int) 2, " "channel-mask = (bitmask) 0x3")
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);
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GST_DEBUG_CATEGORY_STATIC (synae_scope_debug);
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#define GST_CAT_DEFAULT synae_scope_debug
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static void gst_synae_scope_finalize (GObject * object);
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static gboolean gst_synae_scope_setup (GstAudioVisualizer * scope);
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static gboolean gst_synae_scope_render (GstAudioVisualizer * scope,
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GstBuffer * audio, GstVideoFrame * video);
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G_DEFINE_TYPE (GstSynaeScope, gst_synae_scope, GST_TYPE_AUDIO_VISUALIZER);
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static void
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gst_synae_scope_class_init (GstSynaeScopeClass * g_class)
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{
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GObjectClass *gobject_class = (GObjectClass *) g_class;
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GstElementClass *element_class = (GstElementClass *) g_class;
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GstAudioVisualizerClass *scope_class = (GstAudioVisualizerClass *) g_class;
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gobject_class->finalize = gst_synae_scope_finalize;
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gst_element_class_set_static_metadata (element_class, "Synaescope",
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"Visualization",
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"Creates video visualizations of audio input, using stereo and pitch information",
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"Stefan Kost <ensonic@users.sf.net>");
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_synae_scope_src_template));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_synae_scope_sink_template));
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scope_class->setup = GST_DEBUG_FUNCPTR (gst_synae_scope_setup);
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scope_class->render = GST_DEBUG_FUNCPTR (gst_synae_scope_render);
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}
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static void
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gst_synae_scope_init (GstSynaeScope * scope)
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{
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guint32 *colors = scope->colors;
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guint *shade = scope->shade;
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guint i, r, g, b;
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#define BOUND(x) ((x) > 255 ? 255 : (x))
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#define PEAKIFY(x) BOUND((x) - (x)*(255-(x))/255/2)
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for (i = 0; i < 256; i++) {
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r = PEAKIFY ((i & 15 * 16));
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g = PEAKIFY ((i & 15) * 16 + (i & 15 * 16) / 4);
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b = PEAKIFY ((i & 15) * 16);
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colors[i] = (r << 16) | (g << 8) | b;
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}
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#undef BOUND
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#undef PEAKIFY
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for (i = 0; i < 256; i++)
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shade[i] = i * 200 >> 8;
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}
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static void
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gst_synae_scope_finalize (GObject * object)
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{
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GstSynaeScope *scope = GST_SYNAE_SCOPE (object);
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if (scope->fft_ctx) {
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gst_fft_s16_free (scope->fft_ctx);
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scope->fft_ctx = NULL;
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}
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if (scope->freq_data_l) {
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g_free (scope->freq_data_l);
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scope->freq_data_l = NULL;
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}
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if (scope->freq_data_r) {
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g_free (scope->freq_data_r);
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scope->freq_data_r = NULL;
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}
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if (scope->adata_l) {
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g_free (scope->adata_l);
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scope->adata_l = NULL;
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}
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if (scope->adata_r) {
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g_free (scope->adata_r);
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scope->adata_r = NULL;
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}
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G_OBJECT_CLASS (gst_synae_scope_parent_class)->finalize (object);
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}
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static gboolean
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gst_synae_scope_setup (GstAudioVisualizer * bscope)
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{
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GstSynaeScope *scope = GST_SYNAE_SCOPE (bscope);
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guint num_freq = GST_VIDEO_INFO_HEIGHT (&bscope->vinfo) + 1;
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if (scope->fft_ctx)
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gst_fft_s16_free (scope->fft_ctx);
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g_free (scope->freq_data_l);
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g_free (scope->freq_data_r);
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g_free (scope->adata_l);
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g_free (scope->adata_r);
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/* FIXME: we could have horizontal or vertical layout */
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/* we'd need this amount of samples per render() call */
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bscope->req_spf = num_freq * 2 - 2;
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scope->fft_ctx = gst_fft_s16_new (bscope->req_spf, FALSE);
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scope->freq_data_l = g_new (GstFFTS16Complex, num_freq);
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scope->freq_data_r = g_new (GstFFTS16Complex, num_freq);
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scope->adata_l = g_new (gint16, bscope->req_spf);
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scope->adata_r = g_new (gint16, bscope->req_spf);
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return TRUE;
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}
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static inline void
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add_pixel (guint32 * _p, guint32 _c)
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{
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guint8 *p = (guint8 *) _p;
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guint8 *c = (guint8 *) & _c;
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if (p[0] < 255 - c[0])
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p[0] += c[0];
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else
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p[0] = 255;
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if (p[1] < 255 - c[1])
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p[1] += c[1];
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else
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p[1] = 255;
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if (p[2] < 255 - c[2])
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p[2] += c[2];
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else
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p[2] = 255;
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if (p[3] < 255 - c[3])
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p[3] += c[3];
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else
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p[3] = 255;
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}
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static gboolean
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gst_synae_scope_render (GstAudioVisualizer * bscope, GstBuffer * audio,
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GstVideoFrame * video)
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{
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GstSynaeScope *scope = GST_SYNAE_SCOPE (bscope);
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GstMapInfo amap;
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guint32 *vdata;
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gint16 *adata;
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gint16 *adata_l = scope->adata_l;
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gint16 *adata_r = scope->adata_r;
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GstFFTS16Complex *fdata_l = scope->freq_data_l;
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GstFFTS16Complex *fdata_r = scope->freq_data_r;
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gint x, y;
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guint off;
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guint w = GST_VIDEO_INFO_WIDTH (&bscope->vinfo);
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guint h = GST_VIDEO_INFO_HEIGHT (&bscope->vinfo);
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guint32 *colors = scope->colors, c;
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guint *shade = scope->shade;
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//guint w2 = w /2;
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guint ch = GST_AUDIO_INFO_CHANNELS (&bscope->ainfo);
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guint num_samples;
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gint i, j, b;
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gint br, br1, br2;
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gint clarity;
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gdouble fc, r, l, rr, ll;
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gdouble frl, fil, frr, fir;
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const guint sl = 30;
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gst_buffer_map (audio, &amap, GST_MAP_READ);
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vdata = (guint32 *) GST_VIDEO_FRAME_PLANE_DATA (video, 0);
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adata = (gint16 *) amap.data;
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num_samples = amap.size / (ch * sizeof (gint16));
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/* deinterleave */
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for (i = 0, j = 0; i < num_samples; i++) {
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adata_l[i] = adata[j++];
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adata_r[i] = adata[j++];
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}
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/* run fft */
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/*gst_fft_s16_window (scope->fft_ctx, adata_l, GST_FFT_WINDOW_HAMMING); */
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gst_fft_s16_fft (scope->fft_ctx, adata_l, fdata_l);
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/*gst_fft_s16_window (scope->fft_ctx, adata_r, GST_FFT_WINDOW_HAMMING); */
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gst_fft_s16_fft (scope->fft_ctx, adata_r, fdata_r);
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/* draw stars */
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for (y = 0; y < h; y++) {
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b = h - y;
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frl = (gdouble) fdata_l[b].r;
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fil = (gdouble) fdata_l[b].i;
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frr = (gdouble) fdata_r[b].r;
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fir = (gdouble) fdata_r[b].i;
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ll = (frl + fil) * (frl + fil) + (frr - fir) * (frr - fir);
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l = sqrt (ll);
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rr = (frl - fil) * (frl - fil) + (frr + fir) * (frr + fir);
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r = sqrt (rr);
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/* out-of-phase'ness for this frequency component */
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clarity = (gint) (
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((frl + fil) * (frl - fil) + (frr + fir) * (frr - fir)) /
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(ll + rr) * 256);
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fc = r + l;
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x = (guint) (r * w / fc);
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/* the brighness scaling factor was picked by experimenting */
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br = b * fc * 0.01;
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br1 = br * (clarity + 128) >> 8;
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br2 = br * (128 - clarity) >> 8;
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br1 = CLAMP (br1, 0, 255);
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br2 = CLAMP (br2, 0, 255);
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GST_DEBUG ("y %3d fc %10.6f clarity %d br %d br1 %d br2 %d", y, fc, clarity,
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br, br1, br2);
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/* draw a star */
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off = (y * w) + x;
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c = colors[(br1 >> 4) | (br2 & 0xf0)];
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add_pixel (&vdata[off], c);
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if ((x > (sl - 1)) && (x < (w - sl)) && (y > (sl - 1)) && (y < (h - sl))) {
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for (i = 1; br1 || br2; i++, br1 = shade[br1], br2 = shade[br2]) {
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c = colors[(br1 >> 4) + (br2 & 0xf0)];
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add_pixel (&vdata[off - i], c);
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add_pixel (&vdata[off + i], c);
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add_pixel (&vdata[off - i * w], c);
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add_pixel (&vdata[off + i * w], c);
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}
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} else {
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for (i = 1; br1 || br2; i++, br1 = shade[br1], br2 = shade[br2]) {
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c = colors[(br1 >> 4) | (br2 & 0xf0)];
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if (x - i > 0)
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add_pixel (&vdata[off - i], c);
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if (x + i < (w - 1))
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add_pixel (&vdata[off + i], c);
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if (y - i > 0)
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add_pixel (&vdata[off - i * w], c);
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if (y + i < (h - 1))
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add_pixel (&vdata[off + i * w], c);
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}
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}
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}
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gst_buffer_unmap (audio, &amap);
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return TRUE;
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}
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gboolean
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gst_synae_scope_plugin_init (GstPlugin * plugin)
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{
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GST_DEBUG_CATEGORY_INIT (synae_scope_debug, "synaescope", 0, "synaescope");
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return gst_element_register (plugin, "synaescope", GST_RANK_NONE,
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GST_TYPE_SYNAE_SCOPE);
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}
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