avfilter/vf_identity: remove unnecessary check

[ffmpeg] / libavfilter / af_tremolo.c

diff --git a/libavfilter/af_tremolo.c b/libavfilter/af_tremolo.c
index 8cbc79892d1236d6c224b1ffbc2f3c1551fe6669..8f9e3100409fb64b4a0599d223bb34fafc2d6552 100644 (file)
--- a/libavfilter/af_tremolo.c
+++ b/libavfilter/af_tremolo.c
@@ -28,6 +28,7 @@ typedef struct TremoloContext {
     double freq;
     double depth;
     double *table;
+    int table_size;
     int index;
 } TremoloContext;
 
@@ -72,7 +73,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
         dst += channels;
         src += channels;
         s->index++;
-        if (s->index >= inlink->sample_rate / s->freq)
+        if (s->index >= s->table_size)
             s->index = 0;
     }
 
@@ -125,11 +126,12 @@ static int config_input(AVFilterLink *inlink)
     const double offset = 1. - s->depth / 2.;
     int i;
 
-    s->table = av_malloc_array(inlink->sample_rate / s->freq, sizeof(*s->table));
+    s->table_size = lrint(inlink->sample_rate / s->freq + 0.5);
+    s->table = av_malloc_array(s->table_size, sizeof(*s->table));
     if (!s->table)
         return AVERROR(ENOMEM);
 
-    for (i = 0; i < inlink->sample_rate / s->freq; i++) {
+    for (i = 0; i < s->table_size; i++) {
         double env = s->freq * i / inlink->sample_rate;
         env = sin(2 * M_PI * fmod(env + 0.25, 1.0));
         s->table[i] = env * (1 - fabs(offset)) + offset;
@@ -158,7 +160,7 @@ static const AVFilterPad avfilter_af_tremolo_outputs[] = {
     { NULL }
 };
 
-AVFilter ff_af_tremolo = {
+const AVFilter ff_af_tremolo = {
     .name          = "tremolo",
     .description   = NULL_IF_CONFIG_SMALL("Apply tremolo effect."),
     .priv_size     = sizeof(TremoloContext),