From 03123e4053d640070ca77adf99d5ae487806d51e Mon Sep 17 00:00:00 2001
From: Pavel Koshevoy <pkoshevoy@gmail.com>
Date: Wed, 3 Oct 2018 22:59:31 -0600
Subject: [PATCH] lavfi/atempo: fix tempo range limit inconsistency

yae_set_tempo was overlooked when max tempo limit was raised to 100.

tested with:
./ffmpeg_g -i Delerium/SemanticSpaces/Gateway.mp3 \
-af asendcmd=f=asendcmd.cfg,atempo=1.0 -y /tmp/asendcmd-atempo.wav

where asendcmd.cfg was:
15.0-45.0 [enter] atempo tempo 2.0,
          [leave] atempo tempo 0.5;

60.0-300.0 [enter] atempo tempo 4.0,
           [leave] atempo tempo 1.0;
---
 libavfilter/af_atempo.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/libavfilter/af_atempo.c b/libavfilter/af_atempo.c
index 52f15f2769..bfdad7d76b 100644
--- a/libavfilter/af_atempo.c
+++ b/libavfilter/af_atempo.c
@@ -149,11 +149,16 @@ typedef struct ATempoContext {
     uint64_t nsamples_out;
 } ATempoContext;
 
+#define YAE_ATEMPO_MIN 0.5
+#define YAE_ATEMPO_MAX 100.0
+
 #define OFFSET(x) offsetof(ATempoContext, x)
 
 static const AVOption atempo_options[] = {
     { "tempo", "set tempo scale factor",
-      OFFSET(tempo), AV_OPT_TYPE_DOUBLE, { .dbl = 1.0 }, 0.5, 100.0,
+      OFFSET(tempo), AV_OPT_TYPE_DOUBLE, { .dbl = 1.0 },
+      YAE_ATEMPO_MIN,
+      YAE_ATEMPO_MAX,
       AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM },
     { NULL }
 };
@@ -331,9 +336,9 @@ static int yae_set_tempo(AVFilterContext *ctx, const char *arg_tempo)
         return AVERROR(EINVAL);
     }
 
-    if (tempo < 0.5 || tempo > 2.0) {
-        av_log(ctx, AV_LOG_ERROR, "Tempo value %f exceeds [0.5, 2.0] range\n",
-               tempo);
+    if (tempo < YAE_ATEMPO_MIN || tempo > YAE_ATEMPO_MAX) {
+        av_log(ctx, AV_LOG_ERROR, "Tempo value %f exceeds [%f, %f] range\n",
+               tempo, YAE_ATEMPO_MIN, YAE_ATEMPO_MAX);
         return AVERROR(EINVAL);
     }