diff options
| -rw-r--r-- | libavcodec/rka.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/libavcodec/rka.c b/libavcodec/rka.c index 461baf1e1f..994c563ffd 100644 --- a/libavcodec/rka.c +++ b/libavcodec/rka.c @@ -723,16 +723,16 @@ static int decode_filter(RKAContext *s, ChContext *ctx, ACoder *ac, int off, uns last_val = val; src = &ctx->buf1[off + -1]; for (int i = 0; i < filt.size && i < 15; i++) - sum += filt.coeffs[i] * src[-i]; + sum += filt.coeffs[i] * (unsigned)src[-i]; sum = sum * 2; for (int i = 15; i < filt.size; i++) - sum += filt.coeffs[i] * src[-i]; + sum += filt.coeffs[i] * (unsigned)src[-i]; sum = sum >> 6; if (ctx->cmode == 0) { if (bits == 0) { ctx->buf1[off] = sum + val; } else { - ctx->buf1[off] = (val + (sum >> bits) << bits) + + ctx->buf1[off] = (val + (sum >> bits)) * (1 << bits) + (((1U << bits) - 1U) & ctx->buf1[off + -1]); } ctx->buf0[off] = ctx->buf1[off] + ctx->buf0[off + -1]; |