audio: add some setters for mp_audio, and require filters to use them

mp_audio has some redundant fields. Setters like mp_audio_set_format()
initialize these properly.

Also move the mp_audio struct to a the file audio.c.

We can remove a mysterious line of code from af.c:

    in.format |= af_bits2fmt(in.bps * 8);

I'm not sure if this was ever actually needed, or if it was some kind of
"make it work" quick-fix that works against the way things were supposed
to work. All filters etc. now set the format correctly, so if there ever
was a need for this code, it's definitely gone.

1 files changed, 3 insertions, 5 deletions

diff --git a/audio/filter/af_sweep.c b/audio/filter/af_sweep.c
index 6d1106fefc..6cc099f2d8 100644
--- a/audio/filter/af_sweep.c
+++ b/audio/filter/af_sweep.c
@@ -41,12 +41,10 @@ static int control(struct af_instance* af, int cmd, void* arg)
 
   switch(cmd){
   case AF_CONTROL_REINIT:
-    af->data->nch    = data->nch;
-    af->data->format = AF_FORMAT_S16_NE;
-    af->data->bps    = 2;
-    af->data->rate   = data->rate;
+    mp_audio_copy_config(af->data, data);
+    mp_audio_set_format(af->data, AF_FORMAT_S16_NE);
 
-    return AF_OK;
+    return af_test_output(af, data);
   case AF_CONTROL_COMMAND_LINE:
     sscanf((char*)arg,"%lf", &s->delta);
     return AF_OK;