ac3enc: correct the flipped sign in the ac3_fixed encoder

libavcodec/ac3enc_fixed.c

@@ -47,7 +47,7 @@ static av_cold void mdct_end(AC3MDCTContext *mdct)
 static av_cold int mdct_init(AVCodecContext *avctx, AC3MDCTContext *mdct,
                              int nbits)
 {
-    int ret = ff_mdct_init(&mdct->fft, nbits, 0, 1.0);
+    int ret = ff_mdct_init(&mdct->fft, nbits, 0, -1.0);
     mdct->window = ff_ac3_window;
     return ret;
 }

tests/ref/acodec/ac3_fixed

-5ddb6d25dd117db29627f9d286153a7a *./tests/data/acodec/ac3.rm
+0f14801e166819dd4a58981aea36e08b *./tests/data/acodec/ac3.rm
 98751 ./tests/data/acodec/ac3.rm

tests/ref/lavf/rm

-a1c71456f21d5459d2824d75bbdcc80c *./tests/data/lavf/lavf.rm
+2e3d6b1944c6cd2cf14e13055aecf82a *./tests/data/lavf/lavf.rm
 346706 ./tests/data/lavf/lavf.rm

tests/ref/seek/ac3_rm

@@ -11,7 +11,8 @@ ret:-1         st:-1 flags:1  ts: 1.470835
 ret:-1         st: 0 flags:0  ts: 0.365000
 ret: 0         st: 0 flags:1  ts:-0.741000
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:    271 size:   556
-ret:-1         st:-1 flags:0  ts: 2.153336
+ret: 0         st:-1 flags:0  ts: 2.153336
+ret: 0         st: 0 flags:1 dts: 2.159000 pts: 2.159000 pos:  35567 size:   556
 ret:-1         st:-1 flags:1  ts: 1.047503
 ret: 0         st: 0 flags:0  ts:-0.058000
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:    271 size:   556