lavc/libopenh264enc: set slice_mode option to deprecated

"slice mode" option seems to be unnecessary since it could be
determined by -slices/max_nal_size.

default:        SM_FIXEDSLCNUM_SLICE mode with cpu-number slices.
-slices N:      SM_FIXEDSLCNUM_SLICE mode with N slices.
-max_nal_size:  SM_SIZELIMITED_SLICE mode with limited size slices.

Add FF_API_OPENH264_SLICE_MODE macro to remove this option after
LIBAVCODEC_VERSION_MAJOR = 59.
Signed-off-by: Linjie Fu <linjie.fu@intel.com>
Signed-off-by: Martin Storsjö <martin@martin.st>

libavcodec/libopenh264enc.c

@@ -56,11 +56,13 @@ typedef struct SVCContext {
 
 #define OFFSET(x) offsetof(SVCContext, x)
 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
+#define DEPRECATED AV_OPT_FLAG_DEPRECATED
 static const AVOption options[] = {
+#if FF_API_OPENH264_SLICE_MODE
 #if OPENH264_VER_AT_LEAST(1, 6)
-    { "slice_mode", "set slice mode", OFFSET(slice_mode), AV_OPT_TYPE_INT, { .i64 = SM_FIXEDSLCNUM_SLICE }, SM_SINGLE_SLICE, SM_RESERVED, VE, "slice_mode" },
+    { "slice_mode", "set slice mode, use slices/max_nal_size", OFFSET(slice_mode), AV_OPT_TYPE_INT, { .i64 = SM_FIXEDSLCNUM_SLICE }, SM_SINGLE_SLICE, SM_RESERVED, VE|DEPRECATED, "slice_mode" },
 #else
-    { "slice_mode", "set slice mode", OFFSET(slice_mode), AV_OPT_TYPE_INT, { .i64 = SM_AUTO_SLICE }, SM_SINGLE_SLICE, SM_RESERVED, VE, "slice_mode" },
+    { "slice_mode", "set slice mode, use slices/max_nal_size", OFFSET(slice_mode), AV_OPT_TYPE_INT, { .i64 = SM_AUTO_SLICE }, SM_SINGLE_SLICE, SM_RESERVED, VE|DEPRECATED, "slice_mode" },
 #endif
         { "fixed", "a fixed number of slices", 0, AV_OPT_TYPE_CONST, { .i64 = SM_FIXEDSLCNUM_SLICE }, 0, 0, VE, "slice_mode" },
 #if OPENH264_VER_AT_LEAST(1, 6)
@@ -70,6 +72,7 @@ static const AVOption options[] = {
         { "rowmb", "one slice per row of macroblocks", 0, AV_OPT_TYPE_CONST, { .i64 = SM_ROWMB_SLICE }, 0, 0, VE, "slice_mode" },
         { "auto", "automatic number of slices according to number of threads", 0, AV_OPT_TYPE_CONST, { .i64 = SM_AUTO_SLICE }, 0, 0, VE, "slice_mode" },
         { "dyn", "Dynamic slicing", 0, AV_OPT_TYPE_CONST, { .i64 = SM_DYN_SLICE }, 0, 0, VE, "slice_mode" },
+#endif
 #endif
     { "loopfilter", "enable loop filter", OFFSET(loopfilter), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, VE },
     { "profile", "set profile restrictions", OFFSET(profile), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, VE },

libavcodec/version.h

@@ -135,6 +135,9 @@
 #ifndef FF_API_UNSANITIZED_BITRATES
 #define FF_API_UNSANITIZED_BITRATES (LIBAVCODEC_VERSION_MAJOR < 59)
 #endif
+#ifndef FF_API_OPENH264_SLICE_MODE
+#define FF_API_OPENH264_SLICE_MODE (LIBAVCODEC_VERSION_MAJOR < 59)
+#endif
 
 
 #endif /* AVCODEC_VERSION_H */