Linear interpolation fix by Takashi

diff --git a/src/pcm/pcm_rate.c b/src/pcm/pcm_rate.c
index 2e5e73f68e5726052f01083eba21f73e782aaa17..752c3af929ff7c687646c9398d4e3db773df6f28 100644 (file)
--- a/src/pcm/pcm_rate.c
+++ b/src/pcm/pcm_rate.c
@@ -145,18 +145,8 @@ static snd_pcm_uframes_t snd_pcm_rate_expand(const snd_pcm_channel_area_t *dst_a
                                new_sample = sample;
                                src += src_step;
                                src_frames1++;
-#if 1 /* fast-change interpolation */
-      /* this interpolation gives us better results especially for low-rate sources */
-                               // sample = (((int)old_sample * (DIV - pos)) + ((int)new_sample * pos)) / DIV;
-                               sample = ((int)old_sample + (int)new_sample) / 2;
-                       } else {
-                               sample = new_sample;
                        }
-#else /* linear interpolation */
-      /* in some cases, a high-band filter is required to remove high noises */
-                       }
-                       sample = (((int)old_sample * (DIV - pos)) + ((int)new_sample * pos)) / DIV;
-#endif
+                       sample = (((int64_t)old_sample * (int64_t)(get_threshold - pos)) + ((int64_t)new_sample * pos)) / get_threshold;
                        goto *put;
 #define PUT16_END after_put
 #include "plugin_ops.h"