player: add complex filter graph support

See --lavfi-complex option.

This is still quite rough. There's no support for dynamic configuration
of any kind. There are probably corner cases where playback might freeze
or burn 100% CPU (due to dataflow problems when interaction with
libavfilter).

Future possible plans might include:
- freely switch tracks by providing some sort of default track graph
  label
- automatically enabling audio visualization
- automatically mix audio or stack video when multiple tracks are
  selected at once (similar to how multiple sub tracks can be selected)

2 files changed, 3 insertions, 0 deletions

diff --git a/options/options.c b/options/options.c
index 0377854c0e..4352b6ceed 100644
--- a/options/options.c
+++ b/options/options.c
@@ -226,6 +226,8 @@ const m_option_t mp_opts[] = {
     OPT_STRINGLIST("alang", stream_lang[STREAM_AUDIO], 0),
     OPT_STRINGLIST("slang", stream_lang[STREAM_SUB], 0),
 
+    OPT_STRING("lavfi-complex", lavfi_complex, 0),
+
     OPT_CHOICE("audio-display", audio_display, 0,
                ({"no", 0}, {"attachment", 1})),
 
diff --git a/options/options.h b/options/options.h
index 6ce4be472a..488823ca15 100644
--- a/options/options.h
+++ b/options/options.h
@@ -186,6 +186,7 @@ typedef struct MPOpts {
     int ignore_path_in_watch_later_config;
     int pause;
     int keep_open;
+    char *lavfi_complex;
     int stream_id[2][STREAM_TYPE_COUNT];
     int stream_id_ff[STREAM_TYPE_COUNT];
     char **stream_lang[STREAM_TYPE_COUNT];