/* GStreamer * Copyright (C) <2011> Stefan Kost <ensonic@users.sf.net> * * gstsynaescope.c: frequency spectrum scope * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301, USA. */ /** * SECTION:element-synaescope * @title: synaescope * @see_also: goom * * Synaescope is an audio visualisation element. It analyzes frequencies and * out-of phase properties of audio and draws this as clouds of stars. * * ## Example launch line * |[ * gst-launch-1.0 audiotestsrc ! audioconvert ! synaescope ! ximagesink * ]| * */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "gstsynaescope.h" #if G_BYTE_ORDER == G_BIG_ENDIAN #define RGB_ORDER "xRGB" #else #define RGB_ORDER "BGRx" #endif static GstStaticPadTemplate gst_synae_scope_src_template = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE (RGB_ORDER)) ); static GstStaticPadTemplate gst_synae_scope_sink_template = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("audio/x-raw, " "format = (string) " GST_AUDIO_NE (S16) ", " "layout = (string) interleaved, " "rate = (int) [ 8000, 96000 ], " "channels = (int) 2, " "channel-mask = (bitmask) 0x3") ); GST_DEBUG_CATEGORY_STATIC (synae_scope_debug); #define GST_CAT_DEFAULT synae_scope_debug static void gst_synae_scope_finalize (GObject * object); static gboolean gst_synae_scope_setup (GstAudioVisualizer * scope); static gboolean gst_synae_scope_render (GstAudioVisualizer * scope, GstBuffer * audio, GstVideoFrame * video); G_DEFINE_TYPE (GstSynaeScope, gst_synae_scope, GST_TYPE_AUDIO_VISUALIZER); static void gst_synae_scope_class_init (GstSynaeScopeClass * g_class) { GObjectClass *gobject_class = (GObjectClass *) g_class; GstElementClass *element_class = (GstElementClass *) g_class; GstAudioVisualizerClass *scope_class = (GstAudioVisualizerClass *) g_class; gobject_class->finalize = gst_synae_scope_finalize; gst_element_class_set_static_metadata (element_class, "Synaescope", "Visualization", "Creates video visualizations of audio input, using stereo and pitch information", "Stefan Kost <ensonic@users.sf.net>"); gst_element_class_add_static_pad_template (element_class, &gst_synae_scope_src_template); gst_element_class_add_static_pad_template (element_class, &gst_synae_scope_sink_template); scope_class->setup = GST_DEBUG_FUNCPTR (gst_synae_scope_setup); scope_class->render = GST_DEBUG_FUNCPTR (gst_synae_scope_render); } static void gst_synae_scope_init (GstSynaeScope * scope) { guint32 *colors = scope->colors; guint *shade = scope->shade; guint i, r, g, b; #define BOUND(x) ((x) > 255 ? 255 : (x)) #define PEAKIFY(x) BOUND((x) - (x)*(255-(x))/255/2) for (i = 0; i < 256; i++) { r = PEAKIFY ((i & 15 * 16)); g = PEAKIFY ((i & 15) * 16 + (i & 15 * 16) / 4); b = PEAKIFY ((i & 15) * 16); colors[i] = (r << 16) | (g << 8) | b; } #undef BOUND #undef PEAKIFY for (i = 0; i < 256; i++) shade[i] = i * 200 >> 8; } static void gst_synae_scope_finalize (GObject * object) { GstSynaeScope *scope = GST_SYNAE_SCOPE (object); if (scope->fft_ctx) { gst_fft_s16_free (scope->fft_ctx); scope->fft_ctx = NULL; } if (scope->freq_data_l) { g_free (scope->freq_data_l); scope->freq_data_l = NULL; } if (scope->freq_data_r) { g_free (scope->freq_data_r); scope->freq_data_r = NULL; } if (scope->adata_l) { g_free (scope->adata_l); scope->adata_l = NULL; } if (scope->adata_r) { g_free (scope->adata_r); scope->adata_r = NULL; } G_OBJECT_CLASS (gst_synae_scope_parent_class)->finalize (object); } static gboolean gst_synae_scope_setup (GstAudioVisualizer * bscope) { GstSynaeScope *scope = GST_SYNAE_SCOPE (bscope); guint num_freq = GST_VIDEO_INFO_HEIGHT (&bscope->vinfo) + 1; if (scope->fft_ctx) gst_fft_s16_free (scope->fft_ctx); g_free (scope->freq_data_l); g_free (scope->freq_data_r); g_free (scope->adata_l); g_free (scope->adata_r); /* FIXME: we could have horizontal or vertical layout */ /* we'd need this amount of samples per render() call */ bscope->req_spf = num_freq * 2 - 2; scope->fft_ctx = gst_fft_s16_new (bscope->req_spf, FALSE); scope->freq_data_l = g_new (GstFFTS16Complex, num_freq); scope->freq_data_r = g_new (GstFFTS16Complex, num_freq); scope->adata_l = g_new (gint16, bscope->req_spf); scope->adata_r = g_new (gint16, bscope->req_spf); return TRUE; } static inline void add_pixel (guint32 * _p, guint32 _c) { guint8 *p = (guint8 *) _p; guint8 *c = (guint8 *) & _c; if (p[0] < 255 - c[0]) p[0] += c[0]; else p[0] = 255; if (p[1] < 255 - c[1]) p[1] += c[1]; else p[1] = 255; if (p[2] < 255 - c[2]) p[2] += c[2]; else p[2] = 255; if (p[3] < 255 - c[3]) p[3] += c[3]; else p[3] = 255; } static gboolean gst_synae_scope_render (GstAudioVisualizer * bscope, GstBuffer * audio, GstVideoFrame * video) { GstSynaeScope *scope = GST_SYNAE_SCOPE (bscope); GstMapInfo amap; guint32 *vdata; gint16 *adata; gint16 *adata_l = scope->adata_l; gint16 *adata_r = scope->adata_r; GstFFTS16Complex *fdata_l = scope->freq_data_l; GstFFTS16Complex *fdata_r = scope->freq_data_r; gint x, y; guint off; guint w = GST_VIDEO_INFO_WIDTH (&bscope->vinfo); guint h = GST_VIDEO_INFO_HEIGHT (&bscope->vinfo); guint32 *colors = scope->colors, c; guint *shade = scope->shade; //guint w2 = w /2; guint ch = GST_AUDIO_INFO_CHANNELS (&bscope->ainfo); guint num_samples; gint i, j, b; gint br, br1, br2; gint clarity; gdouble fc, r, l, rr, ll; gdouble frl, fil, frr, fir; const guint sl = 30; gst_buffer_map (audio, &amap, GST_MAP_READ); vdata = (guint32 *) GST_VIDEO_FRAME_PLANE_DATA (video, 0); adata = (gint16 *) amap.data; num_samples = amap.size / (ch * sizeof (gint16)); /* deinterleave */ for (i = 0, j = 0; i < num_samples; i++) { adata_l[i] = adata[j++]; adata_r[i] = adata[j++]; } /* run fft */ /*gst_fft_s16_window (scope->fft_ctx, adata_l, GST_FFT_WINDOW_HAMMING); */ gst_fft_s16_fft (scope->fft_ctx, adata_l, fdata_l); /*gst_fft_s16_window (scope->fft_ctx, adata_r, GST_FFT_WINDOW_HAMMING); */ gst_fft_s16_fft (scope->fft_ctx, adata_r, fdata_r); /* draw stars */ for (y = 0; y < h; y++) { b = h - y; frl = (gdouble) fdata_l[b].r; fil = (gdouble) fdata_l[b].i; frr = (gdouble) fdata_r[b].r; fir = (gdouble) fdata_r[b].i; ll = (frl + fil) * (frl + fil) + (frr - fir) * (frr - fir); l = sqrt (ll); rr = (frl - fil) * (frl - fil) + (frr + fir) * (frr + fir); r = sqrt (rr); /* out-of-phase'ness for this frequency component */ clarity = (gint) ( ((frl + fil) * (frl - fil) + (frr + fir) * (frr - fir)) / (ll + rr) * 256); fc = r + l; x = (guint) (r * w / fc); /* the brighness scaling factor was picked by experimenting */ br = b * fc * 0.01; br1 = br * (clarity + 128) >> 8; br2 = br * (128 - clarity) >> 8; br1 = CLAMP (br1, 0, 255); br2 = CLAMP (br2, 0, 255); GST_DEBUG ("y %3d fc %10.6f clarity %d br %d br1 %d br2 %d", y, fc, clarity, br, br1, br2); /* draw a star */ off = (y * w) + x; c = colors[(br1 >> 4) | (br2 & 0xf0)]; add_pixel (&vdata[off], c); if ((x > (sl - 1)) && (x < (w - sl)) && (y > (sl - 1)) && (y < (h - sl))) { for (i = 1; br1 || br2; i++, br1 = shade[br1], br2 = shade[br2]) { c = colors[(br1 >> 4) + (br2 & 0xf0)]; add_pixel (&vdata[off - i], c); add_pixel (&vdata[off + i], c); add_pixel (&vdata[off - i * w], c); add_pixel (&vdata[off + i * w], c); } } else { for (i = 1; br1 || br2; i++, br1 = shade[br1], br2 = shade[br2]) { c = colors[(br1 >> 4) | (br2 & 0xf0)]; if (x - i > 0) add_pixel (&vdata[off - i], c); if (x + i < (w - 1)) add_pixel (&vdata[off + i], c); if (y - i > 0) add_pixel (&vdata[off - i * w], c); if (y + i < (h - 1)) add_pixel (&vdata[off + i * w], c); } } } gst_buffer_unmap (audio, &amap); return TRUE; } gboolean gst_synae_scope_plugin_init (GstPlugin * plugin) { GST_DEBUG_CATEGORY_INIT (synae_scope_debug, "synaescope", 0, "synaescope"); return gst_element_register (plugin, "synaescope", GST_RANK_NONE, GST_TYPE_SYNAE_SCOPE); }