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, 1 insertions, 5 deletions

diff --git a/audio/filter/af.h b/audio/filter/af.h
index 3cfdee85dd..36c2cf33fd 100644
--- a/audio/filter/af.h
+++ b/audio/filter/af.h
@@ -61,7 +61,7 @@ struct af_instance {
     struct mp_audio * (*play)(struct af_instance *af, struct mp_audio *data);
     void *setup;  // old field for priv structs
     void *priv;
-    struct mp_audio *data; // configuration for outgoing data stream
+    struct mp_audio *data; // configuration and buffer for outgoing data stream
     struct af_instance *next;
     struct af_instance *prev;
     double delay; /* Delay caused by the filter, in units of bytes read without
@@ -182,10 +182,6 @@ double af_calc_delay(struct af_stream *s);
  * \{
  */
 
-int af_resize_local_buffer(struct af_instance *af, struct mp_audio *data);
-
-#define RESIZE_LOCAL_BUFFER af_resize_local_buffer
-
 /**
  * \brief convert dB to gain value
  * \param n number of values to convert