lavc: align the linesize to 32 when AVX is enabled

configure

@@ -1469,7 +1469,9 @@ ARCH_FEATURES="
     local_aligned_8
     local_aligned_16
     local_aligned_32
+    simd_align
     simd_align_16
+    simd_align_32
 "
 
 BUILTIN_LIST="
@@ -1880,7 +1882,9 @@ aligned_stack_if_any="aarch64 ppc x86"
 fast_64bit_if_any="aarch64 alpha ia64 mips64 parisc64 ppc64 sparc64 x86_64"
 fast_clz_if_any="aarch64 alpha avr32 mips ppc x86"
 fast_unaligned_if_any="aarch64 ppc x86"
+simd_align_if_any="simd_align_16 simd_align_32"
 simd_align_16_if_any="altivec neon sse"
+simd_align_32_if_any="avx"
 
 # system capabilities
 symver_if_any="symver_asm_label symver_gnu_asm"
@@ -5032,7 +5036,7 @@ enabled_all dxva2 CoTaskMemFree &&
     enable dxva2_lib
 
 ! enabled_any memalign posix_memalign aligned_malloc &&
-    enabled simd_align_16 && enable memalign_hack
+    enabled simd_align && enable memalign_hack
 
 map 'enabled $v && intrinsics=${v#intrinsics_}' $INTRINSICS_LIST
 

libavcodec/utils.c

@@ -178,7 +178,9 @@ int ff_side_data_update_matrix_encoding(AVFrame *frame,
     return 0;
 }
 
-#if HAVE_SIMD_ALIGN_16
+#if HAVE_SIMD_ALIGN_32
+#   define STRIDE_ALIGN 32
+#elif HAVE_SIMD_ALIGN_16
 #   define STRIDE_ALIGN 16
 #else
 #   define STRIDE_ALIGN 8