/usr/include/gmerlin/transcoder.h is in libgmerlin-dev 1.2.0~dfsg+1-5.
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 <gmerlin/transcoder_track.h>
typedef struct bg_transcoder_s bg_transcoder_t;
bg_transcoder_t * bg_transcoder_create();
const bg_parameter_info_t * bg_transcoder_get_parameters();
void bg_transcoder_set_parameter(void * priv, const char * name,
                                 const bg_parameter_value_t * val);
int bg_transcoder_init(bg_transcoder_t * t,
                       bg_plugin_registry_t * plugin_reg, bg_transcoder_track_t * track);
/*
 *  Do one iteration (Will be called as an idle function in the GUI main loop)
 *  If return value is FALSE, we are done
 */
int bg_transcoder_iteration(bg_transcoder_t * t);
void bg_transcoder_destroy(bg_transcoder_t * t);
/* Messages (see transcodermsg.h) */
void bg_transcoder_add_message_queue(bg_transcoder_t * t,
                                     bg_msg_queue_t * message_queue);
/*
 *  Multithread interface
 */
void bg_transcoder_run(bg_transcoder_t * t);
void bg_transcoder_stop(bg_transcoder_t * t);
void bg_transcoder_finish(bg_transcoder_t * t);
/*
 *  Message broadcasting stuff used by both
 *  transcoder and postprocessor
 */
void bg_transcoder_send_msg_num_audio_streams(bg_msg_queue_list_t * l,
                                              int num);
void bg_transcoder_send_msg_num_video_streams(bg_msg_queue_list_t * l,
                                                int num);
void bg_transcoder_send_msg_audio_format(bg_msg_queue_list_t * l,
                                         int index,
                                         gavl_audio_format_t * input_format,
                                         gavl_audio_format_t * output_format);
void bg_transcoder_send_msg_video_format(bg_msg_queue_list_t * l,
                                         int index,
                                         gavl_video_format_t * input_format,
                                         gavl_video_format_t * output_format);
void bg_transcoder_send_msg_file(bg_msg_queue_list_t * l,
                                 const char * filename, int pp_only);
void bg_transcoder_send_msg_progress(bg_msg_queue_list_t * l,
                                     float percentage_done,
                                     gavl_time_t remaining_time);
void bg_transcoder_send_msg_finished(bg_msg_queue_list_t * l);
void bg_transcoder_send_msg_start(bg_msg_queue_list_t * l, char * what);
void bg_transcoder_send_msg_error(bg_msg_queue_list_t * l);
void bg_transcoder_send_msg_metadata(bg_msg_queue_list_t * l,
                                     gavl_metadata_t * m);
/*
 *  Transcoder postprocessing.
 *  
 *  It's a module, which collects informations about transcoded tracks
 *  for doing something else with them after. (e.g. burning onto a CD).
 */
typedef struct bg_transcoder_pp_s bg_transcoder_pp_t;
bg_transcoder_pp_t * bg_transcoder_pp_create();
void bg_transcoder_pp_destroy(bg_transcoder_pp_t*);
int bg_transcoder_pp_init(bg_transcoder_pp_t*, bg_plugin_handle_t * pp_plugin);
void bg_transcoder_pp_update(bg_transcoder_pp_t * p);
void bg_transcoder_pp_connect(bg_transcoder_pp_t*,bg_transcoder_t*);
void bg_transcoder_pp_run(bg_transcoder_pp_t*);
void bg_transcoder_pp_stop(bg_transcoder_pp_t*);
void bg_transcoder_pp_finish(bg_transcoder_pp_t * t);
void bg_transcoder_pp_set_parameter(void * priv, const char * name,
                                    const bg_parameter_value_t * val);
void bg_transcoder_pp_add_message_queue(bg_transcoder_pp_t * p,
                                        bg_msg_queue_t * message_queue);
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