audio: drop --softvol=no and --softvol=auto

Drop the code for switching the volume options and properties between
af_volume and AO volume controls. interface-changes.rst mentions the
changes in detail.

Do this because this was exceedingly complex and had other problems as
well. It was also very hard to test. It's just not worth the trouble.

Some leftovers like AOCONTROL_HAS_PER_APP_VOLUME will be removed at a
later point.

Fixes #3322.

1 files changed, 2 insertions, 3 deletions

diff --git a/options/options.h b/options/options.h
index 5dcc642222..3e8474fd75 100644
--- a/options/options.h
+++ b/options/options.h
@@ -89,9 +89,8 @@ typedef struct MPOpts {
     int ao_null_fallback;
     int force_vo;
     int softvol;
-    float mixer_init_volume;
-    int mixer_init_mute;
-    char *mixer_restore_volume_data;
+    float softvol_volume;
+    int softvol_mute;
     float softvol_max;
     int gapless_audio;
     double audio_buffer;