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Commit c8491535 authored by Takashi Iwai's avatar Takashi Iwai
Browse files

ALSA: line6: Do clipping in volume / monitor manipulations 



Tested-by: default avatarChris Rorvick <chris@rorvick.com>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent e90576c5

sound/usb/line6/playback.c

+7 −3
Original line number Diff line number Diff line
@@ -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);

		}

	}



	/*