alacenc: Fix missing sign_extend()

Possibly fixes Ticket2497 Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
12 years ago · 8aea2f05dc
parent d3c4ea8b35
commit 8aea2f05dc
1 changed files with 1 additions and 1 deletions
--- a/libavcodec/alacenc.c
+++ b/libavcodec/alacenc.c
@ -274,7 +274,7 @@ static void alac_linear_predictor(AlacEncodeContext *s, int ch)
        // generate warm-up samples
        residual[0] = samples[0];
        for (i = 1; i <= lpc.lpc_order; i++)
-            residual[i] = samples[i] - samples[i-1];
+            residual[i] = sign_extend(samples[i] - samples[i-1], s->write_sample_size);

        // perform lpc on remaining samples
        for (i = lpc.lpc_order + 1; i < s->frame_size; i++) {