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, 2 insertions, 7 deletions

diff --git a/audio/filter/af_pan.c b/audio/filter/af_pan.c
index 3c15b8f629..cc6f129542 100644
--- a/audio/filter/af_pan.c
+++ b/audio/filter/af_pan.c
@@ -146,9 +146,6 @@ static int control(struct af_instance* af, int cmd, void* arg)
 // Deallocate memory
 static void uninit(struct af_instance* af)
 {
-  if(af->data)
-    free(af->data->planes[0]);
-  free(af->data);
   free(af->setup);
 }
 
@@ -165,8 +162,7 @@ static struct mp_audio* play(struct af_instance* af, struct mp_audio* data)
   int		ncho = l->nch;		// Number of output channels
   register int  j,k;
 
-  if(AF_OK != RESIZE_LOCAL_BUFFER(af,data))
-    return NULL;
+  mp_audio_realloc_min(af->data, data->samples);
 
   out = l->planes[0];
   // Execute panning
@@ -196,9 +192,8 @@ static int af_open(struct af_instance* af){
   af->uninit=uninit;
   af->play=play;
   af->mul=1;
-  af->data=calloc(1,sizeof(struct mp_audio));
   af->setup=calloc(1,sizeof(af_pan_t));
-  if(af->data == NULL || af->setup == NULL)
+  if(af->setup == NULL)
     return AF_ERROR;
   return AF_OK;
 }