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Иван Мажукин
mpd
Commits
bfef0fbf
Commit
bfef0fbf
authored
Oct 20, 2011
by
Max Kellermann
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pcm_volume: implement float samples
parent
545685bc
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2 changed files
with
19 additions
and
2 deletions
+19
-2
pcm_volume.c
src/pcm_volume.c
+13
-2
pcm_volume.h
src/pcm_volume.h
+6
-0
No files found.
src/pcm_volume.c
View file @
bfef0fbf
...
@@ -132,6 +132,16 @@ pcm_volume_change_32(int32_t *buffer, const int32_t *end, int volume)
...
@@ -132,6 +132,16 @@ pcm_volume_change_32(int32_t *buffer, const int32_t *end, int volume)
}
}
}
}
static
void
pcm_volume_change_float
(
float
*
buffer
,
const
float
*
end
,
float
volume
)
{
while
(
buffer
<
end
)
{
float
sample
=
*
buffer
;
sample
*=
volume
;
*
buffer
++
=
sample
;
}
}
bool
bool
pcm_volume
(
void
*
buffer
,
size_t
length
,
pcm_volume
(
void
*
buffer
,
size_t
length
,
enum
sample_format
format
,
enum
sample_format
format
,
...
@@ -169,8 +179,9 @@ pcm_volume(void *buffer, size_t length,
...
@@ -169,8 +179,9 @@ pcm_volume(void *buffer, size_t length,
return
true
;
return
true
;
case
SAMPLE_FORMAT_FLOAT
:
case
SAMPLE_FORMAT_FLOAT
:
/* XXX */
pcm_volume_change_float
(
buffer
,
end
,
return
false
;
pcm_volume_to_float
(
volume
));
return
true
;
}
}
/* unreachable */
/* unreachable */
...
...
src/pcm_volume.h
View file @
bfef0fbf
...
@@ -43,6 +43,12 @@ pcm_float_to_volume(float volume)
...
@@ -43,6 +43,12 @@ pcm_float_to_volume(float volume)
return
volume
*
PCM_VOLUME_1
+
0
.
5
;
return
volume
*
PCM_VOLUME_1
+
0
.
5
;
}
}
static
inline
float
pcm_volume_to_float
(
int
volume
)
{
return
(
float
)
volume
/
(
float
)
PCM_VOLUME_1
;
}
/**
/**
* Returns the next volume dithering number, between -511 and +511.
* Returns the next volume dithering number, between -511 and +511.
* This number is taken from a global PRNG, see pcm_prng().
* This number is taken from a global PRNG, see pcm_prng().
...
...
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