@@ -37,7 +37,8 @@ static void change_volume(struct urb *urb_out, int volume[],
buf_end = p + urb_out->transfer_buffer_length / sizeof(*p);
for (; p < buf_end; ++p) {
- *p = (*p * volume[chn & 1]) >> 8;
+ int val = (*p * volume[chn & 1]) >> 8;
+ *p = clamp(val, 0x7fff, -0x8000);
++chn;
}
} else if (bytes_per_frame == 6) {
@@ -51,6 +52,7 @@ static void change_volume(struct urb *urb_out, int volume[],
val = p[0] + (p[1] << 8) + ((signed char)p[2] << 16);
val = (val * volume[chn & 1]) >> 8;
+ val = clamp(val, 0x7fffff, -0x800000);
p[0] = val;
p[1] = val >> 8;
p[2] = val >> 16;
@@ -118,8 +120,10 @@ static void add_monitor_signal(struct urb *urb_out, unsigned char *signal,
po = (short *)urb_out->transfer_buffer;
buf_end = po + urb_out->transfer_buffer_length / sizeof(*po);
- for (; po < buf_end; ++pi, ++po)
- *po += (*pi * volume) >> 8;
+ for (; po < buf_end; ++pi, ++po) {
+ int val = *po + ((*pi * volume) >> 8);
+ *po = clamp(val, 0x7fff, -0x8000);
+ }
}
/*
Signed-off-by: Takashi Iwai <tiwai@suse.de> --- sound/usb/line6/playback.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-)