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

Fix noises on exapnd

Browse source 
Fixes noise on rate expansion (bug #1018).
This commit is contained in:
Takashi Iwai 2005-03-29 13:52:41 +00:00
parent 1ac50201b0
commit c5c9b2c8bb
1 changed files with 7 additions and 20 deletions
Download patch file Download diff file Expand all files Collapse all files

27
src/pcm/pcm_rate.c
View file

@ -82,8 +82,6 @@ struct _snd_pcm_rate {
snd_pcm_channel_area_t *pareas; /* areas for splitted period (rate pcm) */
snd_pcm_channel_area_t *sareas; /* areas for splitted period (slave pcm) */
int16_t *old_sample;
int16_t *new_sample;
unsigned int pos;
};
static void snd_pcm_rate_expand(const snd_pcm_channel_area_t *dst_areas,
@ -122,9 +120,8 @@ static void snd_pcm_rate_expand(const snd_pcm_channel_area_t *dst_areas,
dst_step = snd_pcm_channel_area_step(dst_area);
src_frames1 = 0;
dst_frames1 = 0;
old_sample = rate->old_sample[channel];
new_sample = rate->new_sample[channel];
pos = rate->pos;
new_sample = rate->old_sample[channel];
pos = get_threshold;
while (dst_frames1 < dst_frames) {
if (pos >= get_threshold) {
pos -= get_threshold;
@ -154,10 +151,8 @@ static void snd_pcm_rate_expand(const snd_pcm_channel_area_t *dst_areas,
src_frames1++;
}
}
rate->old_sample[channel] = old_sample;
rate->new_sample[channel] = new_sample;
rate->old_sample[channel] = new_sample;
}
rate->pos = pos;
}
/* optimized version for S16 format */
@ -189,9 +184,8 @@ static void snd_pcm_rate_expand_s16(const snd_pcm_channel_area_t *dst_areas,
dst_step = snd_pcm_channel_area_step(dst_area) >> 1;
src_frames1 = 0;
dst_frames1 = 0;
old_sample = rate->old_sample[channel];
new_sample = rate->new_sample[channel];
pos = rate->pos;
new_sample = rate->old_sample[channel];
pos = get_threshold;
while (dst_frames1 < dst_frames) {
if (pos >= get_threshold) {
pos -= get_threshold;
@ -210,10 +204,8 @@ static void snd_pcm_rate_expand_s16(const snd_pcm_channel_area_t *dst_areas,
src_frames1++;
}
}
rate->old_sample[channel] = old_sample;
rate->new_sample[channel] = new_sample;
rate->old_sample[channel] = new_sample;
}
rate->pos = pos;
}
static void snd_pcm_rate_shrink(const snd_pcm_channel_area_t *dst_areas,
@ -588,10 +580,8 @@ static int snd_pcm_rate_hw_params(snd_pcm_t *pcm, snd_pcm_hw_params_t * params)
if (rate->pareas == NULL)
return -ENOMEM;
free(rate->old_sample);
free(rate->new_sample);
rate->old_sample = malloc(sizeof(*rate->old_sample) * channels);
rate->new_sample = malloc(sizeof(*rate->new_sample) * channels);
if (rate->old_sample == NULL || rate->new_sample == NULL)
if (rate->old_sample == NULL)
return -ENOMEM;
pwidth = snd_pcm_format_physical_width(pformat);
swidth = snd_pcm_format_physical_width(sformat);
@ -624,7 +614,6 @@ static int snd_pcm_rate_hw_free(snd_pcm_t *pcm)
rate->sareas = NULL;
}
free(rate->old_sample);
free(rate->new_sample);
return snd_pcm_hw_free(rate->gen.slave);
}
@ -762,9 +751,7 @@ static int snd_pcm_rate_init(snd_pcm_t *pcm)
switch (rate->type) {
case RATE_TYPE_LINEAR:
/* for expand */
rate->pos = rate->pitch;
memset(rate->old_sample, 0, sizeof(*rate->old_sample) * pcm->channels);
memset(rate->new_sample, 0, sizeof(*rate->new_sample) * pcm->channels);
break;
default:
assert(0);