/usr/include/gmerlin/gui_gtk/audio.h is in libgmerlin-dev 1.0.0~dfsg-13.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* gmerlin - a general purpose multimedia framework and applications
*
* Copyright (c) 2001 - 2011 Members of the Gmerlin project
* gmerlin-general@lists.sourceforge.net
* http://gmerlin.sourceforge.net
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* *****************************************************************/
#include <gavl/gavl.h>
#include <gmerlin/cfg_registry.h>
/* Audio monitor, will have level meters and other stuff */
typedef struct bg_gtk_vumeter_s bg_gtk_vumeter_t;
bg_gtk_vumeter_t *
bg_gtk_vumeter_create(int max_num_channels, int vertical);
GtkWidget *
bg_gtk_vumeter_get_widget(bg_gtk_vumeter_t * m);
void bg_gtk_vumeter_set_format(bg_gtk_vumeter_t * m,
gavl_audio_format_t * format);
void bg_gtk_vumeter_update(bg_gtk_vumeter_t * m,
gavl_audio_frame_t * frame);
void bg_gtk_vumeter_reset_overflow(bg_gtk_vumeter_t *);
void bg_gtk_vumeter_draw(bg_gtk_vumeter_t * m);
void bg_gtk_vumeter_destroy(bg_gtk_vumeter_t * m);
void bg_gtk_vumeter_update_peak(bg_gtk_vumeter_t * m,
double * ampl, int samples);
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