lavc/aarch64: Fix compilation with --disable-neon

Fixes ticket #8565.

libavcodec/aarch64/Makefile

@@ -6,6 +6,7 @@ OBJS-$(CONFIG_H264DSP)                  += aarch64/h264dsp_init_aarch64.o
 OBJS-$(CONFIG_H264PRED)                 += aarch64/h264pred_init.o
 OBJS-$(CONFIG_H264QPEL)                 += aarch64/h264qpel_init_aarch64.o
 OBJS-$(CONFIG_HPELDSP)                  += aarch64/hpeldsp_init_aarch64.o
+OBJS-$(CONFIG_IDCTDSP)                  += aarch64/idctdsp_init_aarch64.o
 OBJS-$(CONFIG_MPEGAUDIODSP)             += aarch64/mpegaudiodsp_init.o
 OBJS-$(CONFIG_NEON_CLOBBER_TEST)        += aarch64/neontest.o
 OBJS-$(CONFIG_VIDEODSP)                 += aarch64/videodsp_init.o
@@ -42,8 +43,7 @@ NEON-OBJS-$(CONFIG_H264PRED)            += aarch64/h264pred_neon.o
 NEON-OBJS-$(CONFIG_H264QPEL)            += aarch64/h264qpel_neon.o             \
                                            aarch64/hpeldsp_neon.o
 NEON-OBJS-$(CONFIG_HPELDSP)             += aarch64/hpeldsp_neon.o
-NEON-OBJS-$(CONFIG_IDCTDSP)             += aarch64/idctdsp_init_aarch64.o      \
-                                           aarch64/simple_idct_neon.o
+NEON-OBJS-$(CONFIG_IDCTDSP)             += aarch64/simple_idct_neon.o
 NEON-OBJS-$(CONFIG_MDCT)                += aarch64/mdct_neon.o
 NEON-OBJS-$(CONFIG_MPEGAUDIODSP)        += aarch64/mpegaudiodsp_neon.o
 NEON-OBJS-$(CONFIG_VP8DSP)              += aarch64/vp8dsp_neon.o

libavcodec/aarch64/idctdsp_init_aarch64.c

@@ -21,6 +21,8 @@
  */
 
 #include "libavutil/attributes.h"
+#include "libavutil/cpu.h"
+#include "libavutil/arm/cpu.h"
 #include "libavcodec/avcodec.h"
 #include "libavcodec/idctdsp.h"
 #include "idct.h"
@@ -28,7 +30,9 @@
 av_cold void ff_idctdsp_init_aarch64(IDCTDSPContext *c, AVCodecContext *avctx,
                                      unsigned high_bit_depth)
 {
-    if (!avctx->lowres && !high_bit_depth) {
+    int cpu_flags = av_get_cpu_flags();
+
+    if (have_neon(cpu_flags) && !avctx->lowres && !high_bit_depth) {
         if (avctx->idct_algo == FF_IDCT_AUTO ||
             avctx->idct_algo == FF_IDCT_SIMPLEAUTO ||
             avctx->idct_algo == FF_IDCT_SIMPLENEON) {