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/* GStreamer
* Copyright (C) <2011> Stefan Kost <ensonic@users.sf.net>
*
* gstwavescope.c: simple oscilloscope
*
* 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-wavescope
* @see_also: goom
*
* Wavescope is a simple audio visualisation element. It renders the waveforms
* like on an oscilloscope.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch audiotestsrc ! audioconvert ! wavescope ! ximagesink
* ]|
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include "gstwavescope.h"
static GstStaticPadTemplate gst_wave_scope_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
#if G_BYTE_ORDER == G_BIG_ENDIAN
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("xRGB"))
#else
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("BGRx"))
#endif
);
static GstStaticPadTemplate gst_wave_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 (wave_scope_debug);
#define GST_CAT_DEFAULT wave_scope_debug
enum
{
PROP_0,
PROP_STYLE
};
enum
{
STYLE_DOTS = 0,
STYLE_LINES,
STYLE_COLOR_DOTS,
STYLE_COLOR_LINES,
NUM_STYLES
};
#define GST_TYPE_WAVE_SCOPE_STYLE (gst_wave_scope_style_get_type ())
static GType
gst_wave_scope_style_get_type (void)
{
static GType gtype = 0;
if (gtype == 0) {
static const GEnumValue values[] = {
{STYLE_DOTS, "draw dots (default)", "dots"},
{STYLE_LINES, "draw lines", "lines"},
{STYLE_COLOR_DOTS, "draw color dots", "color-dots"},
{STYLE_COLOR_LINES, "draw color lines", "color-lines"},
{0, NULL, NULL}
};
gtype = g_enum_register_static ("GstWaveScopeStyle", values);
}
return gtype;
}
static void gst_wave_scope_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_wave_scope_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_wave_scope_finalize (GObject * object);
static void render_dots (GstAudioVisualizer * scope, guint32 * vdata,
gint16 * adata, guint num_samples);
static void render_lines (GstAudioVisualizer * scope, guint32 * vdata,
gint16 * adata, guint num_samples);
static void render_color_dots (GstAudioVisualizer * base, guint32 * vdata,
gint16 * adata, guint num_samples);
static void render_color_lines (GstAudioVisualizer * base, guint32 * vdata,
gint16 * adata, guint num_samples);
static gboolean gst_wave_scope_setup (GstAudioVisualizer * scope);
static gboolean gst_wave_scope_render (GstAudioVisualizer * base,
GstBuffer * audio, GstVideoFrame * video);
#define gst_wave_scope_parent_class parent_class
G_DEFINE_TYPE (GstWaveScope, gst_wave_scope, GST_TYPE_AUDIO_VISUALIZER);
static void
gst_wave_scope_class_init (GstWaveScopeClass * g_class)
{
GObjectClass *gobject_class = (GObjectClass *) g_class;
GstElementClass *gstelement_class = (GstElementClass *) g_class;
GstAudioVisualizerClass *scope_class = (GstAudioVisualizerClass *) g_class;
gobject_class->set_property = gst_wave_scope_set_property;
gobject_class->get_property = gst_wave_scope_get_property;
gobject_class->finalize = gst_wave_scope_finalize;
scope_class->setup = GST_DEBUG_FUNCPTR (gst_wave_scope_setup);
scope_class->render = GST_DEBUG_FUNCPTR (gst_wave_scope_render);
g_object_class_install_property (gobject_class, PROP_STYLE,
g_param_spec_enum ("style", "drawing style",
"Drawing styles for the wave form display.",
GST_TYPE_WAVE_SCOPE_STYLE, STYLE_DOTS,
G_PARAM_CONSTRUCT | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_set_static_metadata (gstelement_class,
"Waveform oscilloscope", "Visualization", "Simple waveform oscilloscope",
"Stefan Kost <ensonic@users.sf.net>");
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_wave_scope_src_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_wave_scope_sink_template));
}
static void
gst_wave_scope_init (GstWaveScope * scope)
{
/* do nothing */
}
static void
gst_wave_scope_finalize (GObject * object)
{
GstWaveScope *scope = GST_WAVE_SCOPE (object);
if (scope->flt) {
g_free (scope->flt);
scope->flt = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_wave_scope_setup (GstAudioVisualizer * bscope)
{
GstWaveScope *scope = GST_WAVE_SCOPE (bscope);
if (scope->flt)
g_free (scope->flt);
scope->flt = g_new0 (gdouble, 6 * GST_AUDIO_INFO_CHANNELS (&bscope->ainfo));
return TRUE;
}
static void
gst_wave_scope_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstWaveScope *scope = GST_WAVE_SCOPE (object);
switch (prop_id) {
case PROP_STYLE:
scope->style = g_value_get_enum (value);
switch (scope->style) {
case STYLE_DOTS:
scope->process = render_dots;
break;
case STYLE_LINES:
scope->process = render_lines;
break;
case STYLE_COLOR_DOTS:
scope->process = render_color_dots;
break;
case STYLE_COLOR_LINES:
scope->process = render_color_lines;
break;
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_wave_scope_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstWaveScope *scope = GST_WAVE_SCOPE (object);
switch (prop_id) {
case PROP_STYLE:
g_value_set_enum (value, scope->style);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
#include "gstdrawhelpers.h"
static void
render_dots (GstAudioVisualizer * base, guint32 * vdata, gint16 * adata,
guint num_samples)
{
gint channels = GST_AUDIO_INFO_CHANNELS (&base->ainfo);
guint i, c, s, x, y, oy;
gfloat dx, dy;
guint w = GST_VIDEO_INFO_WIDTH (&base->vinfo);
guint h = GST_VIDEO_INFO_HEIGHT (&base->vinfo);
/* draw dots */
dx = (gfloat) w / (gfloat) num_samples;
dy = h / 65536.0;
oy = h / 2;
for (c = 0; c < channels; c++) {
s = c;
for (i = 0; i < num_samples; i++) {
x = (guint) ((gfloat) i * dx);
y = (guint) (oy + (gfloat) adata[s] * dy);
s += channels;
draw_dot (vdata, x, y, w, 0x00FFFFFF);
}
}
}
static void
render_lines (GstAudioVisualizer * base, guint32 * vdata, gint16 * adata,
guint num_samples)
{
gint channels = GST_AUDIO_INFO_CHANNELS (&base->ainfo);
guint i, c, s, x, y, oy;
gfloat dx, dy;
guint w = GST_VIDEO_INFO_WIDTH (&base->vinfo);
guint h = GST_VIDEO_INFO_HEIGHT (&base->vinfo);
gint x2, y2;
/* draw lines */
dx = (gfloat) (w - 1) / (gfloat) num_samples;
dy = (h - 1) / 65536.0;
oy = (h - 1) / 2;
for (c = 0; c < channels; c++) {
s = c;
x2 = 0;
y2 = (guint) (oy + (gfloat) adata[s] * dy);
for (i = 1; i < num_samples; i++) {
x = (guint) ((gfloat) i * dx);
y = (guint) (oy + (gfloat) adata[s] * dy);
s += channels;
draw_line_aa (vdata, x2, x, y2, y, w, 0x00FFFFFF);
x2 = x;
y2 = y;
}
}
}
#define CUTOFF_1 0.15
#define CUTOFF_2 0.45
#define RESONANCE (1.0/0.5)
#define filter(in) G_STMT_START { \
flt[2] = in - (flt[1] * RESONANCE) - flt[0]; \
flt[1] += (flt[2] * CUTOFF_1); \
flt[0] += (flt[1] * CUTOFF_1); \
\
flt[5] = (flt[1] + flt[2]) - (flt[4] * RESONANCE) - flt[3]; \
flt[4] += (flt[5] * CUTOFF_2); \
flt[3] += (flt[4] * CUTOFF_2); \
} G_STMT_END
static void
render_color_dots (GstAudioVisualizer * base, guint32 * vdata,
gint16 * adata, guint num_samples)
{
GstWaveScope *scope = (GstWaveScope *) base;
gint channels = GST_AUDIO_INFO_CHANNELS (&base->ainfo);
guint i, c, s, x, y, oy;
gfloat dx, dy;
guint w = GST_VIDEO_INFO_WIDTH (&base->vinfo);
guint h = GST_VIDEO_INFO_HEIGHT (&base->vinfo), h1 = h - 2;
gdouble *flt = scope->flt;
/* draw dots */
dx = (gfloat) w / (gfloat) num_samples;
dy = h / 65536.0;
oy = h / 2;
for (c = 0; c < channels; c++) {
s = c;
for (i = 0; i < num_samples; i++) {
x = (guint) ((gfloat) i * dx);
filter ((gfloat) adata[s]);
y = (guint) (oy + flt[0] * dy);
y = MIN (y, h1);
draw_dot_c (vdata, x, y, w, 0x00FF0000);
y = (guint) (oy + flt[3] * dy);
y = MIN (y, h1);
draw_dot_c (vdata, x, y, w, 0x0000FF00);
y = (guint) (oy + (flt[4] + flt[5]) * dy);
y = MIN (y, h1);
draw_dot_c (vdata, x, y, w, 0x000000FF);
s += channels;
}
flt += 6;
}
}
static void
render_color_lines (GstAudioVisualizer * base, guint32 * vdata,
gint16 * adata, guint num_samples)
{
GstWaveScope *scope = (GstWaveScope *) base;
gint channels = GST_AUDIO_INFO_CHANNELS (&base->ainfo);
guint i, c, s, x, y, oy;
gfloat dx, dy;
guint w = GST_VIDEO_INFO_WIDTH (&base->vinfo);
guint h = GST_VIDEO_INFO_HEIGHT (&base->vinfo), h1 = h - 2;
gdouble *flt = scope->flt;
gint x2, y2, y3, y4;
/* draw lines */
dx = (gfloat) (w - 1) / (gfloat) num_samples;
dy = (h - 1) / 65536.0;
oy = (h - 1) / 2;
for (c = 0; c < channels; c++) {
s = c;
/* do first pixels */
x2 = 0;
filter ((gfloat) adata[s]);
y = (guint) (oy + flt[0] * dy);
y2 = MIN (y, h1);
y = (guint) (oy + flt[3] * dy);
y3 = MIN (y, h1);
y = (guint) (oy + (flt[4] + flt[5]) * dy);
y4 = MIN (y, h1);
for (i = 1; i < num_samples; i++) {
x = (guint) ((gfloat) i * dx);
filter ((gfloat) adata[s]);
y = (guint) (oy + flt[0] * dy);
y = MIN (y, h1);
draw_line_aa (vdata, x2, x, y2, y, w, 0x00FF0000);
y2 = y;
y = (guint) (oy + flt[3] * dy);
y = MIN (y, h1);
draw_line_aa (vdata, x2, x, y3, y, w, 0x0000FF00);
y3 = y;
y = (guint) (oy + (flt[4] + flt[5]) * dy);
y = MIN (y, h1);
draw_line_aa (vdata, x2, x, y4, y, w, 0x000000FF);
y4 = y;
x2 = x;
s += channels;
}
flt += 6;
}
}
static gboolean
gst_wave_scope_render (GstAudioVisualizer * base, GstBuffer * audio,
GstVideoFrame * video)
{
GstWaveScope *scope = GST_WAVE_SCOPE (base);
GstMapInfo amap;
guint num_samples;
gint channels = GST_AUDIO_INFO_CHANNELS (&base->ainfo);
gst_buffer_map (audio, &amap, GST_MAP_READ);
num_samples = amap.size / (channels * sizeof (gint16));
scope->process (base, (guint32 *) GST_VIDEO_FRAME_PLANE_DATA (video, 0),
(gint16 *) amap.data, num_samples);
gst_buffer_unmap (audio, &amap);
return TRUE;
}
gboolean
gst_wave_scope_plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (wave_scope_debug, "wavescope", 0, "wavescope");
return gst_element_register (plugin, "wavescope", GST_RANK_NONE,
GST_TYPE_WAVE_SCOPE);
}