+
+#define DOWNMIX_FUNC_OPT(ch, opt) \
+void ff_ac3_downmix_ ## ch ## _to_1_ ## opt(float **samples, \
+ float **matrix, int len); \
+void ff_ac3_downmix_ ## ch ## _to_2_ ## opt(float **samples, \
+ float **matrix, int len);
+
+#define DOWNMIX_FUNCS(opt) \
+ DOWNMIX_FUNC_OPT(3, opt) \
+ DOWNMIX_FUNC_OPT(4, opt) \
+ DOWNMIX_FUNC_OPT(5, opt) \
+ DOWNMIX_FUNC_OPT(6, opt)
+
+DOWNMIX_FUNCS(sse)
+DOWNMIX_FUNCS(avx)
+DOWNMIX_FUNCS(fma3)
+
+void ff_ac3dsp_set_downmix_x86(AC3DSPContext *c)
+{
+ int cpu_flags = av_get_cpu_flags();
+
+#define SET_DOWNMIX(ch, suf, SUF) \
+ if (ch == c->in_channels) { \
+ if (EXTERNAL_ ## SUF (cpu_flags)) { \
+ if (c->out_channels == 1) \
+ c->downmix = ff_ac3_downmix_ ## ch ## _to_1_ ## suf; \
+ else \
+ c->downmix = ff_ac3_downmix_ ## ch ## _to_2_ ## suf; \
+ } \
+ }
+
+#define SET_DOWNMIX_ALL(suf, SUF) \
+ SET_DOWNMIX(3, suf, SUF) \
+ SET_DOWNMIX(4, suf, SUF) \
+ SET_DOWNMIX(5, suf, SUF) \
+ SET_DOWNMIX(6, suf, SUF)
+
+ SET_DOWNMIX_ALL(sse, SSE)
+ if (!(cpu_flags & AV_CPU_FLAG_AVXSLOW)) {
+ SET_DOWNMIX_ALL(avx, AVX)
+ SET_DOWNMIX_ALL(fma3, FMA3)
+ }
+}