avdevice/avdevice: Constify avdevice_list_input_sources/output_sinks

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>

doc/APIchanges

@@ -14,6 +14,10 @@ libavutil:     2017-10-21
 
 API changes, most recent first:
 
+2021-04-27 - xxxxxxxxxx - lavd yyyyyyyyy - avdevice.h
+  avdevice_list_input_sources and avdevice_list_output_sinks now accept
+  pointers to const AVInputFormat resp. const AVOutputFormat.
+
 2021-04-27 - xxxxxxxxxx - lavf yyyyyyyyy - avformat.h
   av_find_best_stream now uses a const AVCodec ** parameter
   for the returned decoder.

fftools/cmdutils.c

@@ -2205,7 +2205,7 @@ double get_rotation(AVStream *st)
 }
 
 #if CONFIG_AVDEVICE
-static int print_device_sources(AVInputFormat *fmt, AVDictionary *opts)
+static int print_device_sources(const AVInputFormat *fmt, AVDictionary *opts)
 {
     int ret, i;
     AVDeviceInfoList *device_list = NULL;
@@ -2235,7 +2235,7 @@ static int print_device_sources(AVInputFormat *fmt, AVDictionary *opts)
     return ret;
 }
 
-static int print_device_sinks(AVOutputFormat *fmt, AVDictionary *opts)
+static int print_device_sinks(const AVOutputFormat *fmt, AVDictionary *opts)
 {
     int ret, i;
     AVDeviceInfoList *device_list = NULL;

libavdevice/avdevice.c

@@ -120,7 +120,7 @@ static int list_devices_for_context(AVFormatContext *s, AVDictionary *options,
     return ret;
 }
 
-int avdevice_list_input_sources(AVInputFormat *device, const char *device_name,
+int avdevice_list_input_sources(const AVInputFormat *device, const char *device_name,
                                 AVDictionary *device_options, AVDeviceInfoList **device_list)
 {
     AVFormatContext *s = NULL;
@@ -131,7 +131,7 @@ int avdevice_list_input_sources(AVInputFormat *device, const char *device_name,
     return list_devices_for_context(s, device_options, device_list);
 }
 
-int avdevice_list_output_sinks(AVOutputFormat *device, const char *device_name,
+int avdevice_list_output_sinks(const AVOutputFormat *device, const char *device_name,
                                AVDictionary *device_options, AVDeviceInfoList **device_list)
 {
     AVFormatContext *s = NULL;

libavdevice/avdevice.h

@@ -507,9 +507,9 @@ void avdevice_free_list_devices(AVDeviceInfoList **device_list);
  * @return count of autodetected devices, negative on error.
  * @note device argument takes precedence over device_name when both are set.
  */
-int avdevice_list_input_sources(struct AVInputFormat *device, const char *device_name,
+int avdevice_list_input_sources(const AVInputFormat *device, const char *device_name,
                                 AVDictionary *device_options, AVDeviceInfoList **device_list);
-int avdevice_list_output_sinks(struct AVOutputFormat *device, const char *device_name,
+int avdevice_list_output_sinks(const AVOutputFormat *device, const char *device_name,
                                AVDictionary *device_options, AVDeviceInfoList **device_list);
 
 /**