af: don't require filters to allocate af_instance->data, redo buffers

Allocate af_instance->data in generic code before filter initialization.
Every filter needs af->data (since it contains the output
configuration), so there's no reason why every filter should allocate
and free it.

Remove RESIZE_LOCAL_BUFFER(), and replace it with mp_audio_realloc_min().
Interestingly, most code becomes simpler, because the new function takes
the size in samples, and not in bytes. There are larger change in
af_scaletempo.c and af_lavcac3enc.c, because these had copied and
modified versions of the RESIZE_LOCAL_BUFFER macro/function.

1 files changed, 0 insertions, 1 deletions

diff --git a/audio/filter/af_volume.c b/audio/filter/af_volume.c
index d4a1ec616b..982b3816c7 100644
--- a/audio/filter/af_volume.c
+++ b/audio/filter/af_volume.c
@@ -105,7 +105,6 @@ static int af_open(struct af_instance *af)
     af->control = control;
     af->play = play;
     af->mul = 1;
-    af->data = talloc_zero(af, struct mp_audio);
     af_from_dB(1, &s->cfg_volume, &s->level, 20.0, -200.0, 60.0);
     return AF_OK;
 }