fftools/ffmpeg_filter: Make functions only used locally static

Also remove some declarations of inexistent functions while at it.

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

fftools/ffmpeg.h

@@ -640,21 +640,14 @@ extern HWDevice *filter_hw_device;
 void term_init(void);
 void term_exit(void);
 
-void reset_options(OptionsContext *o, int is_input);
 void show_usage(void);
 
-void opt_output_file(void *optctx, const char *filename);
-
 void remove_avoptions(AVDictionary **a, AVDictionary *b);
 void assert_avoptions(AVDictionary *m);
 
 int guess_input_channel_layout(InputStream *ist);
 
-enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodecContext *avctx,
-                                    const AVCodec *codec, enum AVPixelFormat target);
-
 int configure_filtergraph(FilterGraph *fg);
-int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out);
 void check_filter_outputs(void);
 int filtergraph_is_simple(FilterGraph *fg);
 int init_simple_filtergraph(InputStream *ist, OutputStream *ost);

fftools/ffmpeg_filter.c

@@ -60,7 +60,7 @@ static const enum AVPixelFormat *get_compliance_unofficial_pix_fmts(enum AVCodec
     }
 }
 
-enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodecContext *enc_ctx,
+static enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodecContext *enc_ctx,
                                     const AVCodec *codec, enum AVPixelFormat target)
 {
     if (codec && codec->pix_fmts) {
@@ -645,7 +645,8 @@ static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter,
     return 0;
 }
 
-int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
+static int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter,
+                                   AVFilterInOut *out)
 {
     if (!ofilter->ost) {
         av_log(NULL, AV_LOG_FATAL, "Filter %s has an unconnected output\n", ofilter->name);