avcodec/mpegvideo: use constants for rc_strategy

libavcodec/mpegvideo.h

@@ -557,6 +557,12 @@ typedef struct MpegEncContext {
 #define FF_MPV_FLAG_NAQ          0x0010
 #define FF_MPV_FLAG_MV0          0x0020
 
+enum rc_strategy {
+    MPV_RC_STRATEGY_FFMPEG,
+    MPV_RC_STRATEGY_XVID,
+    NB_MPV_RC_STRATEGY
+};
+
 #ifndef FF_MPV_OFFSET
 #define FF_MPV_OFFSET(x) offsetof(MpegEncContext, x)
 #endif
@@ -592,7 +598,9 @@ typedef struct MpegEncContext {
 {"lmax", "maximum Lagrange factor (VBR)",                           FF_MPV_OFFSET(lmax), AV_OPT_TYPE_INT, {.i64 = 31*FF_QP2LAMBDA }, 0, INT_MAX, FF_MPV_OPT_FLAGS },            \
 {"ibias", "intra quant bias",                                       FF_MPV_OFFSET(intra_quant_bias), AV_OPT_TYPE_INT, {.i64 = FF_DEFAULT_QUANT_BIAS }, INT_MIN, INT_MAX, FF_MPV_OPT_FLAGS },   \
 {"pbias", "inter quant bias",                                       FF_MPV_OFFSET(inter_quant_bias), AV_OPT_TYPE_INT, {.i64 = FF_DEFAULT_QUANT_BIAS }, INT_MIN, INT_MAX, FF_MPV_OPT_FLAGS },   \
-{"rc_strategy", "ratecontrol method",                               FF_MPV_OFFSET(rc_strategy), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, FF_MPV_OPT_FLAGS },   \
+{"rc_strategy", "ratecontrol method",                               FF_MPV_OFFSET(rc_strategy), AV_OPT_TYPE_INT, {.i64 = MPV_RC_STRATEGY_FFMPEG }, 0, NB_MPV_RC_STRATEGY-1, FF_MPV_OPT_FLAGS, "rc_strategy" },   \
+    { "ffmpeg", "default native rate control", 0, AV_OPT_TYPE_CONST, { .i64 = MPV_RC_STRATEGY_FFMPEG }, 0, 0, FF_MPV_OPT_FLAGS, "rc_strategy" }, \
+    { "xvid",   "libxvid (2 pass only)",       0, AV_OPT_TYPE_CONST, { .i64 = MPV_RC_STRATEGY_XVID },   0, 0, FF_MPV_OPT_FLAGS, "rc_strategy" }, \
 {"motion_est", "motion estimation algorithm",                       FF_MPV_OFFSET(motion_est), AV_OPT_TYPE_INT, {.i64 = FF_ME_EPZS }, FF_ME_ZERO, FF_ME_XONE, FF_MPV_OPT_FLAGS, "motion_est" },   \
 { "zero", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FF_ME_ZERO }, 0, 0, FF_MPV_OPT_FLAGS, "motion_est" }, \
 { "epzs", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FF_ME_EPZS }, 0, 0, FF_MPV_OPT_FLAGS, "motion_est" }, \

libavcodec/ratecontrol.c

@@ -233,8 +233,12 @@ FF_ENABLE_DEPRECATION_WARNINGS
             return -1;
         }
 
+#if FF_API_RC_STRATEGY
+        av_assert0(MPV_RC_STRATEGY_XVID == FF_RC_STRATEGY_XVID);
+#endif
+
         // FIXME maybe move to end
-        if ((s->avctx->flags & AV_CODEC_FLAG_PASS2) && s->rc_strategy == 1) {
+        if ((s->avctx->flags & AV_CODEC_FLAG_PASS2) && s->rc_strategy == MPV_RC_STRATEGY_XVID) {
 #if CONFIG_LIBXVID
             return ff_xvid_rate_control_init(s);
 #else
@@ -314,7 +318,7 @@ av_cold void ff_rate_control_uninit(MpegEncContext *s)
     av_freep(&rcc->entry);
 
 #if CONFIG_LIBXVID
-    if ((s->avctx->flags & AV_CODEC_FLAG_PASS2) && s->rc_strategy == 1)
+    if ((s->avctx->flags & AV_CODEC_FLAG_PASS2) && s->rc_strategy == MPV_RC_STRATEGY_XVID)
         ff_xvid_rate_control_uninit(s);
 #endif
 }
@@ -767,7 +771,7 @@ float ff_rate_estimate_qscale(MpegEncContext *s, int dry_run)
     emms_c();
 
 #if CONFIG_LIBXVID
-    if ((s->avctx->flags & AV_CODEC_FLAG_PASS2) && s->rc_strategy == 1)
+    if ((s->avctx->flags & AV_CODEC_FLAG_PASS2) && s->rc_strategy == MPV_RC_STRATEGY_XVID)
         return ff_xvid_rate_estimate_qscale(s, dry_run);
 #endif