sbc: Fix for overflow bug in SBC quantization code

The result of multiplication does not always fit into 32-bits. Using 64-bit
calculations helps to avoid overflows and sound quality problems in encoded
audio. Overflows are more likely to show up when using high values for
bitpool setting.

1 files changed, 1 insertions, 1 deletions

diff --git a/sbc/sbc.c b/sbc/sbc.c
index c495a75..f766642 100644
--- a/sbc/sbc.c
+++ b/sbc/sbc.c
@@ -1104,7 +1104,7 @@ static int sbc_pack_frame(uint8_t *data, struct sbc_frame *frame, size_t len)
 			for (sb = 0; sb < frame->subbands; sb++) {
 				if (levels[ch][sb] > 0) {
 					audio_sample =
-						(uint16_t) ((((frame->sb_sample_f[blk][ch][sb]*levels[ch][sb]) >>
+						(uint16_t) (((((int64_t)frame->sb_sample_f[blk][ch][sb]*levels[ch][sb]) >>
 									(frame->scale_factor[ch][sb] + 1)) +
 								levels[ch][sb]) >> 1);
 					PUT_BITS(audio_sample & levels[ch][sb], bits[ch][sb]);