summaryrefslogtreecommitdiff
path: root/drivers/isdn/mISDN/dsp_audio.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/isdn/mISDN/dsp_audio.c')
-rw-r--r--drivers/isdn/mISDN/dsp_audio.c22
1 files changed, 5 insertions, 17 deletions
diff --git a/drivers/isdn/mISDN/dsp_audio.c b/drivers/isdn/mISDN/dsp_audio.c
index 06022952a..bbef98e7a 100644
--- a/drivers/isdn/mISDN/dsp_audio.c
+++ b/drivers/isdn/mISDN/dsp_audio.c
@@ -13,6 +13,7 @@
#include <linux/mISDNif.h>
#include <linux/mISDNdsp.h>
#include <linux/export.h>
+#include <linux/bitrev.h>
#include "core.h"
#include "dsp.h"
@@ -137,27 +138,14 @@ static unsigned char linear2ulaw(short sample)
return ulawbyte;
}
-static int reverse_bits(int i)
-{
- int z, j;
- z = 0;
-
- for (j = 0; j < 8; j++) {
- if ((i & (1 << j)) != 0)
- z |= 1 << (7 - j);
- }
- return z;
-}
-
-
void dsp_audio_generate_law_tables(void)
{
int i;
for (i = 0; i < 256; i++)
- dsp_audio_alaw_to_s32[i] = alaw2linear(reverse_bits(i));
+ dsp_audio_alaw_to_s32[i] = alaw2linear(bitrev8((u8)i));
for (i = 0; i < 256; i++)
- dsp_audio_ulaw_to_s32[i] = ulaw2linear(reverse_bits(i));
+ dsp_audio_ulaw_to_s32[i] = ulaw2linear(bitrev8((u8)i));
for (i = 0; i < 256; i++) {
dsp_audio_alaw_to_ulaw[i] =
@@ -176,13 +164,13 @@ dsp_audio_generate_s2law_table(void)
/* generating ulaw-table */
for (i = -32768; i < 32768; i++) {
dsp_audio_s16_to_law[i & 0xffff] =
- reverse_bits(linear2ulaw(i));
+ bitrev8(linear2ulaw(i));
}
} else {
/* generating alaw-table */
for (i = -32768; i < 32768; i++) {
dsp_audio_s16_to_law[i & 0xffff] =
- reverse_bits(linear2alaw(i));
+ bitrev8(linear2alaw(i));
}
}
}