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_export.c b/audio/filter/af_export.c
index a6ebdc322e..0139b17d4f 100644
--- a/audio/filter/af_export.c
+++ b/audio/filter/af_export.c
@@ -183,9 +183,6 @@ static int control(struct af_instance* af, int cmd, void* arg)
 */
 static void uninit( struct af_instance* af )
 {
-  free(af->data);
-  af->data = NULL;
-
   if(af->setup){
     af_export_t* s = af->setup;
     if (s->buf)
@@ -260,9 +257,8 @@ 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_export_t));
-  if((af->data == NULL) || (af->setup == NULL))
+  if(af->setup == NULL)
     return AF_ERROR;
 
   ((af_export_t *)af->setup)->filename = mp_find_user_config_file(SHARED_FILE);