cos is an even function; use this.
Signed-off-by: Ganesh Ajjanagadde <gajjanaga...@gmail.com>
---
libavcodec/dcaenc.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/libavcodec/dcaenc.c b/libavcodec/dcaenc.c
index 5a6bdac..b12d27b 100644
--- a/libavcodec/dcaenc.c
+++ b/libavcodec/dcaenc.c
@@ -169,8 +169,12 @@ static int encode_init(AVCodecContext *avctx)
if (!cos_table[0]) {
int j, k;
- for (i = 0; i < 2048; i++) {
+ cos_table[0] = 0x7fffffff;
+ for (i = 1; i < 1025; i++) {
cos_table[i] = (int32_t)(0x7fffffff * cos(M_PI * i / 1024));
+ cos_table[2048-i] = cos_table[i];
+ }
+ for (i = 0; i < 2048; i++) {
cb_to_level[i] = (int32_t)(0x7fffffff * pow(10, -0.005 * i));
}
--
2.6.3
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