lavc: mark mb_qmin/mb_qmax for removal on next major bump.

They've been unused and deprecated for about five years.

libavcodec/avcodec.h

@@ -1818,19 +1818,21 @@ typedef struct AVCodecContext {
      */
     uint64_t error[4];
 
+#if FF_API_MB_Q
     /**
      * minimum MB quantizer
      * - encoding: unused
      * - decoding: unused
      */
-    int mb_qmin;
+    attribute_deprecated int mb_qmin;
 
     /**
      * maximum MB quantizer
      * - encoding: unused
      * - decoding: unused
      */
-    int mb_qmax;
+    attribute_deprecated int mb_qmax;
+#endif
 
     /**
      * motion estimation comparison function

libavcodec/options.c

@@ -259,8 +259,10 @@ static const AVOption options[]={
 {"pf", "forward predicted MVs of P-frames", 0, FF_OPT_TYPE_CONST, FF_DEBUG_VIS_MV_P_FOR, INT_MIN, INT_MAX, V|D, "debug_mv"},
 {"bf", "forward predicted MVs of B-frames", 0, FF_OPT_TYPE_CONST, FF_DEBUG_VIS_MV_B_FOR, INT_MIN, INT_MAX, V|D, "debug_mv"},
 {"bb", "backward predicted MVs of B-frames", 0, FF_OPT_TYPE_CONST, FF_DEBUG_VIS_MV_B_BACK, INT_MIN, INT_MAX, V|D, "debug_mv"},
+#if FF_API_MB_Q
 {"mb_qmin", "obsolete, use qmin", OFFSET(mb_qmin), FF_OPT_TYPE_INT, DEFAULT, INT_MIN, INT_MAX, V|E},
 {"mb_qmax", "obsolete, use qmax", OFFSET(mb_qmax), FF_OPT_TYPE_INT, DEFAULT, INT_MIN, INT_MAX, V|E},
+#endif
 {"cmp", "full pel me compare function", OFFSET(me_cmp), FF_OPT_TYPE_INT, DEFAULT, INT_MIN, INT_MAX, V|E, "cmp_func"},
 {"subcmp", "sub pel me compare function", OFFSET(me_sub_cmp), FF_OPT_TYPE_INT, DEFAULT, INT_MIN, INT_MAX, V|E, "cmp_func"},
 {"mbcmp", "macroblock compare function", OFFSET(mb_cmp), FF_OPT_TYPE_INT, DEFAULT, INT_MIN, INT_MAX, V|E, "cmp_func"},

libavcodec/version.h

@@ -77,5 +77,8 @@
 #ifndef FF_API_RATE_EMU
 #define FF_API_RATE_EMU         (LIBAVCODEC_VERSION_MAJOR < 53)
 #endif
+#ifndef FF_API_MB_Q
+#define FF_API_MB_Q             (LIBAVCODEC_VERSION_MAJOR < 53)
+#endif
 
 #endif /* AVCODEC_VERSION_H */