First of all, is /sound/oss/* still maintained?

#define HWBASE_AD (448000)
...
with if(bta->analog) evaluating to true bta->decimation may range
from 15 to 5
...
HWBASE_AD*4/bta->decimation>>bta->sampleshift

which is equivalent to 

((HWBASE_AD * 4)/bta->decimation) >> bta->sampleshift

actually may evaluate to something like:

(1792000 / 15 ) >> bta->sampleshift

Isn't intended (HWBASE_AD * 4)/(bta->decimation >> bta->sampleshift)?
Then consider the patch below.
--
Fix operator precedence in return

Signed-off-by: Roel Kluin <12o3l@tiscali.nl>
---
diff --git a/sound/oss/btaudio.c b/sound/oss/btaudio.c
index 4d5cf05..2a5cace 100644
--- a/sound/oss/btaudio.c
+++ b/sound/oss/btaudio.c
@@ -661,7 +661,8 @@ static int btaudio_dsp_ioctl(struct inode *inode, struct file *file,
 		/* fall through */
         case SOUND_PCM_READ_RATE:
 		if (bta->analog) {
-			return put_user(HWBASE_AD*4/bta->decimation>>bta->sampleshift, p);
+			return put_user((HWBASE_AD * 4) /
+				(bta->decimation >> bta->sampleshift), p);
 		} else {
 			return put_user(bta->rate, p);
 		}
-
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