| /* GStreamer |
| * Copyright (C) <2011> Stefan Kost <ensonic@users.sf.net> |
| * |
| * gstspectrascope.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-spectrascope |
| * @see_also: goom |
| * |
| * Spectrascope is a simple spectrum visualisation element. It renders the |
| * frequency spectrum as a series of bars. |
| * |
| * <refsect2> |
| * <title>Example launch line</title> |
| * |[ |
| * gst-launch-1.0 audiotestsrc ! audioconvert ! spectrascope ! ximagesink |
| * ]| |
| * </refsect2> |
| */ |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| #include <stdlib.h> |
| |
| #include "gstspectrascope.h" |
| |
| #if G_BYTE_ORDER == G_BIG_ENDIAN |
| #define RGB_ORDER "xRGB" |
| #else |
| #define RGB_ORDER "BGRx" |
| #endif |
| |
| static GstStaticPadTemplate gst_spectra_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_spectra_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 (spectra_scope_debug); |
| #define GST_CAT_DEFAULT spectra_scope_debug |
| |
| static void gst_spectra_scope_finalize (GObject * object); |
| |
| static gboolean gst_spectra_scope_setup (GstAudioVisualizer * scope); |
| static gboolean gst_spectra_scope_render (GstAudioVisualizer * scope, |
| GstBuffer * audio, GstVideoFrame * video); |
| |
| |
| G_DEFINE_TYPE (GstSpectraScope, gst_spectra_scope, GST_TYPE_AUDIO_VISUALIZER); |
| |
| static void |
| gst_spectra_scope_class_init (GstSpectraScopeClass * g_class) |
| { |
| GObjectClass *gobject_class = (GObjectClass *) g_class; |
| GstElementClass *element_class = (GstElementClass *) g_class; |
| GstAudioVisualizerClass *scope_class = (GstAudioVisualizerClass *) g_class; |
| |
| gobject_class->finalize = gst_spectra_scope_finalize; |
| |
| gst_element_class_set_static_metadata (element_class, |
| "Frequency spectrum scope", "Visualization", |
| "Simple frequency spectrum scope", "Stefan Kost <ensonic@users.sf.net>"); |
| |
| gst_element_class_add_static_pad_template (element_class, |
| &gst_spectra_scope_src_template); |
| gst_element_class_add_static_pad_template (element_class, |
| &gst_spectra_scope_sink_template); |
| |
| scope_class->setup = GST_DEBUG_FUNCPTR (gst_spectra_scope_setup); |
| scope_class->render = GST_DEBUG_FUNCPTR (gst_spectra_scope_render); |
| } |
| |
| static void |
| gst_spectra_scope_init (GstSpectraScope * scope) |
| { |
| /* do nothing */ |
| } |
| |
| static void |
| gst_spectra_scope_finalize (GObject * object) |
| { |
| GstSpectraScope *scope = GST_SPECTRA_SCOPE (object); |
| |
| if (scope->fft_ctx) { |
| gst_fft_s16_free (scope->fft_ctx); |
| scope->fft_ctx = NULL; |
| } |
| if (scope->freq_data) { |
| g_free (scope->freq_data); |
| scope->freq_data = NULL; |
| } |
| |
| G_OBJECT_CLASS (gst_spectra_scope_parent_class)->finalize (object); |
| } |
| |
| static gboolean |
| gst_spectra_scope_setup (GstAudioVisualizer * bscope) |
| { |
| GstSpectraScope *scope = GST_SPECTRA_SCOPE (bscope); |
| guint num_freq = GST_VIDEO_INFO_WIDTH (&bscope->vinfo) + 1; |
| |
| if (scope->fft_ctx) |
| gst_fft_s16_free (scope->fft_ctx); |
| g_free (scope->freq_data); |
| |
| /* 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 = g_new (GstFFTS16Complex, num_freq); |
| |
| 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_spectra_scope_render (GstAudioVisualizer * bscope, GstBuffer * audio, |
| GstVideoFrame * video) |
| { |
| GstSpectraScope *scope = GST_SPECTRA_SCOPE (bscope); |
| gint16 *mono_adata; |
| GstFFTS16Complex *fdata = scope->freq_data; |
| guint x, y, off, l; |
| guint w = GST_VIDEO_INFO_WIDTH (&bscope->vinfo); |
| guint h = GST_VIDEO_INFO_HEIGHT (&bscope->vinfo) - 1; |
| gfloat fr, fi; |
| GstMapInfo amap; |
| guint32 *vdata; |
| gint channels; |
| |
| gst_buffer_map (audio, &amap, GST_MAP_READ); |
| vdata = (guint32 *) GST_VIDEO_FRAME_PLANE_DATA (video, 0); |
| |
| channels = GST_AUDIO_INFO_CHANNELS (&bscope->ainfo); |
| |
| mono_adata = (gint16 *) g_memdup (amap.data, amap.size); |
| |
| if (channels > 1) { |
| guint ch = channels; |
| guint num_samples = amap.size / (ch * sizeof (gint16)); |
| guint i, c, v, s = 0; |
| |
| /* deinterleave and mixdown adata */ |
| for (i = 0; i < num_samples; i++) { |
| v = 0; |
| for (c = 0; c < ch; c++) { |
| v += mono_adata[s++]; |
| } |
| mono_adata[i] = v / ch; |
| } |
| } |
| |
| /* run fft */ |
| gst_fft_s16_window (scope->fft_ctx, mono_adata, GST_FFT_WINDOW_HAMMING); |
| gst_fft_s16_fft (scope->fft_ctx, mono_adata, fdata); |
| g_free (mono_adata); |
| |
| /* draw lines */ |
| for (x = 0; x < w; x++) { |
| /* figure out the range so that we don't need to clip, |
| * or even better do a log mapping? */ |
| fr = (gfloat) fdata[1 + x].r / 512.0; |
| fi = (gfloat) fdata[1 + x].i / 512.0; |
| y = (guint) (h * sqrt (fr * fr + fi * fi)); |
| if (y > h) |
| y = h; |
| y = h - y; |
| off = (y * w) + x; |
| vdata[off] = 0x00FFFFFF; |
| for (l = y; l < h; l++) { |
| off += w; |
| add_pixel (&vdata[off], 0x007F7F7F); |
| } |
| /* ensure bottom line is full bright (especially in move-up mode) */ |
| add_pixel (&vdata[off], 0x007F7F7F); |
| } |
| gst_buffer_unmap (audio, &amap); |
| return TRUE; |
| } |
| |
| gboolean |
| gst_spectra_scope_plugin_init (GstPlugin * plugin) |
| { |
| GST_DEBUG_CATEGORY_INIT (spectra_scope_debug, "spectrascope", 0, |
| "spectrascope"); |
| |
| return gst_element_register (plugin, "spectrascope", GST_RANK_NONE, |
| GST_TYPE_SPECTRA_SCOPE); |
| } |