128 lines
4.3 KiB
C
128 lines
4.3 KiB
C
/* libgnomecanvas/gnome-canvas-waveview.h: GnomeCanvas item for displaying wave data
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*
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* Copyright (C) 2001 Paul Davis <pbd@op.net>
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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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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*/
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#ifndef __GNOME_CANVAS_WAVEVIEW_H__
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#define __GNOME_CANVAS_WAVEVIEW_H__
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#include <stdint.h>
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#include <libgnomecanvas/libgnomecanvas.h>
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BEGIN_GNOME_CANVAS_DECLS
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/* Wave viewer item for canvas.
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*/
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#define GNOME_CANVAS_TYPE_CANVAS_WAVEVIEW (gnome_canvas_waveview_get_type ())
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#define GNOME_CANVAS_WAVEVIEW(obj) (GTK_CHECK_CAST ((obj), GNOME_CANVAS_TYPE_CANVAS_WAVEVIEW, GnomeCanvasWaveView))
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#define GNOME_CANVAS_WAVEVIEW_CLASS(klass) (GTK_CHECK_CLASS_CAST ((klass), GNOME_CANVAS_TYPE_CANVAS_WAVEVIEW, GnomeCanvasWaveViewClass))
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#define GNOME_CANVAS_IS_CANVAS_WAVEVIEW(obj) (GTK_CHECK_TYPE ((obj), GNOME_CANVAS_TYPE_CANVAS_WAVEVIEW))
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#define GNOME_CANVAS_IS_CANVAS_WAVEVIEW_CLASS(klass) (GTK_CHECK_CLASS_TYPE ((klass), GNOME_CANVAS_TYPE_CANVAS_WAVEVIEW))
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typedef struct _GnomeCanvasWaveView GnomeCanvasWaveView;
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typedef struct _GnomeCanvasWaveViewClass GnomeCanvasWaveViewClass;
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typedef struct _GnomeCanvasWaveViewChannelInfo GnomeCanvasWaveViewChannelInfo;
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typedef struct _GnomeCanvasWaveViewCacheEntry GnomeCanvasWaveViewCacheEntry;
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typedef struct _GnomeCanvasWaveViewCache GnomeCanvasWaveViewCache;
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/* XXX this needs to be synced with ardour/source.h PeakData */
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struct _GnomeCanvasWaveViewCacheEntry
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{
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float min;
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float max;
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};
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struct _GnomeCanvasWaveViewCache
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{
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GnomeCanvasWaveViewCacheEntry* data;
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gint32 allocated;
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gint32 data_size;
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gulong start;
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gulong end;
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};
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GnomeCanvasWaveViewCache* gnome_canvas_waveview_cache_new ();
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void gnome_canvas_waveview_cache_destroy (GnomeCanvasWaveViewCache*);
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struct _GnomeCanvasWaveView
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{
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GnomeCanvasItem item;
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GnomeCanvasWaveViewCache *cache;
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gboolean cache_updater;
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gint screen_width;
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void *data_src;
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guint32 channel;
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void (*peak_function)(void*,gulong,gulong,gulong,gpointer,guint32,double);
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gulong (*length_function)(void *);
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gulong (*sourcefile_length_function)(void*);
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void (*gain_curve_function)(void *arg, double start, double end, float* vector, guint32 veclen);
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void *gain_src;
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/* x-axis: samples per canvas unit. */
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double samples_per_unit;
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/* y-axis: amplitude_above_axis.
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*
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* the default is that an (scaled, normalized -1.0 ... +1.0) amplitude of 1.0
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* corresponds to the top of the area assigned to the waveview.
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*
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* larger values will expand the vertical scale, cutting off the peaks/troughs.
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* smaller values will decrease the vertical scale, moving peaks/troughs toward
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* the middle of the area assigned to the waveview.
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*/
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double amplitude_above_axis;
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double x;
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double y;
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double height;
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double half_height;
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uint32_t wave_color;
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char rectified;
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/* These are updated by the update() routine
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to optimize the render() routine, which may
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be called several times after a single update().
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*/
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int32_t bbox_ulx;
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int32_t bbox_uly;
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int32_t bbox_lrx;
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int32_t bbox_lry;
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unsigned char wave_r, wave_g, wave_b, wave_a;
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uint32_t samples;
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uint32_t region_start;
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int32_t reload_cache_in_render;
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};
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struct _GnomeCanvasWaveViewClass {
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GnomeCanvasItemClass parent_class;
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};
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GtkType gnome_canvas_waveview_get_type (void);
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END_GNOME_CANVAS_DECLS
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#endif /* __GNOME_CANVAS_WAVEVIEW_H__ */
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