avcodec/nv{enc,dec}: use sane version checking macro

For some odd reason, the Nvidia version macros puts the minor version in
the msb, so comparing against it is impossible.

libavcodec/nvdec.h

@@ -32,6 +32,15 @@
 
 #include "avcodec.h"
 
+#if defined(NVDECAPI_MAJOR_VERSION) && defined(NVDECAPI_MINOR_VERSION)
+# define NVDECAPI_CHECK_VERSION(major, minor) \
+    ((major) < NVDECAPI_MAJOR_VERSION || ((major) == NVDECAPI_MAJOR_VERSION && (minor) <= NVDECAPI_MINOR_VERSION))
+#else
+/* version macros were added in SDK 8.1 ffnvcodec */
+# define NVDECAPI_CHECK_VERSION(major, minor) \
+    ((major) < 8 || ((major) == 8 && (minor) <= 0))
+#endif
+
 typedef struct NVDECFrame {
     unsigned int idx;
     AVBufferRef *idx_ref;

libavcodec/nvdec_hevc.c

@@ -107,7 +107,7 @@ static int nvdec_hevc_start_frame(AVCodecContext *avctx,
             .log2_diff_max_min_pcm_luma_coding_block_size = sps->pcm.log2_max_pcm_cb_size - sps->pcm.log2_min_pcm_cb_size,
             .pcm_sample_bit_depth_luma_minus1             = sps->pcm_enabled_flag ? sps->pcm.bit_depth - 1 : 0,
             .pcm_sample_bit_depth_chroma_minus1           = sps->pcm_enabled_flag ? sps->pcm.bit_depth_chroma - 1 : 0,
-#if defined(NVDECAPI_VERSION) && NVDECAPI_VERSION >= 0x01000008
+#if NVDECAPI_CHECK_VERSION(8, 1)
             .log2_max_transform_skip_block_size_minus2    = pps->log2_max_transform_skip_block_size - 2,
             .log2_sao_offset_scale_luma                   = pps->log2_sao_offset_scale_luma,
             .log2_sao_offset_scale_chroma                 = pps->log2_sao_offset_scale_chroma,

libavcodec/nvenc.c

@@ -119,7 +119,7 @@ static int nvenc_print_error(void *log_ctx, NVENCSTATUS err,
 
 static void nvenc_print_driver_requirement(AVCodecContext *avctx, int level)
 {
-#if NVENCAPI_VERSION >= 0x01000008
+#if NVENCAPI_CHECK_VERSION(8, 1)
 # if defined(_WIN32) || defined(__CYGWIN__)
     const char *minver = "390.77";
 # else

libavcodec/nvenc.h

@@ -40,8 +40,11 @@ typedef void ID3D11Device;
 #define RC_MODE_DEPRECATED 0x800000
 #define RCD(rc_mode) ((rc_mode) | RC_MODE_DEPRECATED)
 
+#define NVENCAPI_CHECK_VERSION(major, minor) \
+    ((major) < NVENCAPI_MAJOR_VERSION || ((major) == NVENCAPI_MAJOR_VERSION && (minor) <= NVENCAPI_MINOR_VERSION))
+
 // SDK 8.1 compile time feature checks
-#if NVENCAPI_VERSION >= 0x01000008
+#if NVENCAPI_CHECK_VERSION(8, 1)
 #define NVENC_HAVE_BFRAME_REF_MODE
 #define NVENC_HAVE_QP_MAP_MODE
 #endif