aout: change rate argument

Inverse it.

Before, the float rate value for a 4x speed was 0.25f. Now, for a 4x speed, the
float value will be 4.f.

src/audio_output/dec.c

@@ -253,7 +253,7 @@ static void aout_DecSynchronize(audio_output_t *aout, vlc_tick_t dec_pts)
      * where supported. The other alternative is to flush the buffers
      * completely. */
     if (drift > (owner->sync.discontinuity ? 0
-                : lroundf(+3 * AOUT_MAX_PTS_DELAY * rate)))
+                : lroundf(+3 * AOUT_MAX_PTS_DELAY / rate)))
     {
         if (!owner->sync.discontinuity)
             msg_Warn (aout, "playback way too late (%"PRId64"): "

src/audio_output/filters.c

@@ -685,7 +685,7 @@ block_t *aout_FiltersPlay(aout_filters_t *filters, block_t *block, float rate)
 
         /* Override input rate */
         nominal_rate = rate_filter->fmt_in.audio.i_rate;
-        rate_filter->fmt_in.audio.i_rate = lroundf(nominal_rate / rate);
+        rate_filter->fmt_in.audio.i_rate = lroundf(nominal_rate * rate);
     }
 
     block = aout_FiltersPipelinePlay (filters->tab, filters->count, block);

src/input/decoder.c

@@ -1630,7 +1630,7 @@ static void OutputChangeRate( decoder_t *p_dec, float rate )
             break;
         case AUDIO_ES:
             if( p_owner->p_aout != NULL )
-                aout_DecChangeRate( p_owner->p_aout, 1 / rate );
+                aout_DecChangeRate( p_owner->p_aout, rate );
             break;
         case SPU_ES:
             break;