mirrors/alsa-lib
1
0
Fork 0
mirror of https://github.com/alsa-project/alsa-lib.git synced 2025-10-29 05:40:25 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

Linear interpolation fix by Takashi

Browse source
This commit is contained in:
Jaroslav Kysela 2002-03-12 19:22:43 +00:00
parent 8336a94225
commit b559c97833
1 changed files with 1 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

12
src/pcm/pcm_rate.c
View file

@ -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"