gst/audiovisualizers/gstaudiovisualizer.h

/* GStreamer
 * Copyright (C) <2011> Stefan Kost <ensonic@users.sf.net>
 * Copyright (C) <2015> Luis de Bethencourt <luis@debethencourt.com>
 *
 * gstaudiovisualizer.c: base class for audio visualisation elements
 *
 * 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.
 */

#ifndef __GST_AUDIO_VISUALIZER_H__
#define __GST_AUDIO_VISUALIZER_H__

#include <gst/gst.h>
#include <gst/base/gstbasetransform.h>

#include <gst/video/video.h>
#include <gst/audio/audio.h>
#include <gst/base/gstadapter.h>

G_BEGIN_DECLS

#define GST_TYPE_AUDIO_VISUALIZER            (gst_audio_visualizer_get_type())
#define GST_AUDIO_VISUALIZER(obj)            (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AUDIO_VISUALIZER,GstAudioVisualizer))
#define GST_AUDIO_VISUALIZER_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_AUDIO_VISUALIZER,GstAudioVisualizerClass))
#define GST_AUDIO_VISUALIZER_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS((obj),GST_TYPE_AUDIO_VISUALIZER,GstAudioVisualizerClass))
#define GST_IS_AUDIO_VISUALIZER(obj)         (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AUDIO_VISUALIZER))
#define GST_IS_AUDIO_VISUALIZER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_AUDIO_VISUALIZER))

typedef struct _GstAudioVisualizer GstAudioVisualizer;
typedef struct _GstAudioVisualizerClass GstAudioVisualizerClass;
typedef struct _GstAudioVisualizerPrivate GstAudioVisualizerPrivate;

typedef void (*GstAudioVisualizerShaderFunc)(GstAudioVisualizer *scope, const GstVideoFrame *s, GstVideoFrame *d);

/**
 * GstAudioVisualizerShader:
 * @GST_AUDIO_VISUALIZER_SHADER_NONE: no shading
 * @GST_AUDIO_VISUALIZER_SHADER_FADE: plain fading
 * @GST_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_UP: fade and move up
 * @GST_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_DOWN: fade and move down
 * @GST_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_LEFT: fade and move left
 * @GST_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_RIGHT: fade and move right
 * @GST_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_HORIZ_OUT: fade and move horizontally out
 * @GST_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_HORIZ_IN: fade and move horizontally in
 * @GST_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_VERT_OUT: fade and move vertically out
 * @GST_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_VERT_IN: fade and move vertically in
 *
 * Different types of supported background shading functions.
 */
typedef enum {
  GST_AUDIO_VISUALIZER_SHADER_NONE,
  GST_AUDIO_VISUALIZER_SHADER_FADE,
  GST_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_UP,
  GST_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_DOWN,
  GST_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_LEFT,
  GST_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_RIGHT,
  GST_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_HORIZ_OUT,
  GST_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_HORIZ_IN,
  GST_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_VERT_OUT,
  GST_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_VERT_IN
} GstAudioVisualizerShader;

struct _GstAudioVisualizer
{
  GstElement parent;

  guint req_spf;                /* min samples per frame wanted by the subclass */

  /* video state */
  GstVideoInfo vinfo;

  /* audio state */
  GstAudioInfo ainfo;

  /* <private> */
  GstAudioVisualizerPrivate *priv;
};

struct _GstAudioVisualizerClass
{
  GstElementClass parent_class;

  /* virtual function, called whenever the format changes */
  gboolean (*setup) (GstAudioVisualizer * scope);

  /* virtual function for rendering a frame */
  gboolean (*render) (GstAudioVisualizer * scope, GstBuffer * audio, GstVideoFrame * video);

  gboolean (*decide_allocation)   (GstAudioVisualizer * scope, GstQuery *query);
};

GType gst_audio_visualizer_get_type (void);

G_END_DECLS
#endif /* __GST_AUDIO_VISUALIZER_H__ */