libaf: change filter input/output ratio calculations

Change the audio filters to use a double instead of rationals for the
ratio of output to input size. The rationals could overflow when
calculating the overall ratio of a filter chain and gave no real
advantage compared to doubles.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@24916 b3059339-0415-0410-9bf9-f77b7e298cf2

1 files changed, 4 insertions, 7 deletions

diff --git a/libaf/af_channels.c b/libaf/af_channels.c
index 3ebb894f56..772242038e 100644
--- a/libaf/af_channels.c
+++ b/libaf/af_channels.c
@@ -148,9 +148,7 @@ static int control(struct af_instance_s* af, int cmd, void* arg)
     af->data->rate   = ((af_data_t*)arg)->rate;
     af->data->format = ((af_data_t*)arg)->format;
     af->data->bps    = ((af_data_t*)arg)->bps;
-    af->mul.n        = af->data->nch;
-    af->mul.d	     = ((af_data_t*)arg)->nch;
-    af_frac_cancel(&af->mul);
+    af->mul          = (double)af->data->nch / ((af_data_t*)arg)->nch;
     return check_routes(s,((af_data_t*)arg)->nch,af->data->nch);
   case AF_CONTROL_COMMAND_LINE:{
     int nch = 0;
@@ -251,7 +249,7 @@ static af_data_t* play(struct af_instance_s* af, af_data_t* data)
     return NULL;
 
   // Reset unused channels
-  memset(l->audio,0,(c->len*af->mul.n)/af->mul.d);
+  memset(l->audio,0,c->len / c->nch * l->nch);
   
   if(AF_OK == check_routes(s,c->nch,l->nch))
     for(i=0;i<s->nr;i++)
@@ -260,7 +258,7 @@ static af_data_t* play(struct af_instance_s* af, af_data_t* data)
   
   // Set output data
   c->audio = l->audio;
-  c->len   = (c->len*af->mul.n)/af->mul.d;
+  c->len   = c->len / c->nch * l->nch;
   c->nch   = l->nch;
 
   return c;
@@ -271,8 +269,7 @@ static int af_open(af_instance_t* af){
   af->control=control;
   af->uninit=uninit;
   af->play=play;
-  af->mul.n=1;
-  af->mul.d=1;
+  af->mul=1;
   af->data=calloc(1,sizeof(af_data_t));
   af->setup=calloc(1,sizeof(af_channels_t));
   if((af->data == NULL) || (af->setup == NULL))