ad_lavc: strip non-normalized floats

`opus` codec likes returning denormalized floats in some cases, causing
wacky issues.

Fixes #10290

audio/aframe.c

@@ -466,6 +466,37 @@ void mp_aframe_skip_samples(struct mp_aframe *f, int samples)
         f->pts += samples / mp_aframe_get_effective_rate(f);
 }
 
+// sanitize a floating point sample value
+#define sanitizef(f) do {       \
+    if (!isnormal(f))           \
+        (f) = 0;                \
+} while (0)
+
+void mp_aframe_sanitize_float(struct mp_aframe *mpa)
+{
+    int format = af_fmt_from_planar(mp_aframe_get_format(mpa));
+    if (format != AF_FORMAT_FLOAT && format != AF_FORMAT_DOUBLE)
+        return;
+    int num_planes = mp_aframe_get_planes(mpa);
+    uint8_t **planes = mp_aframe_get_data_rw(mpa);
+    if (!planes)
+        return;
+    for (int p = 0; p < num_planes; p++) {
+        void *ptr = planes[p];
+        int total = mp_aframe_get_total_plane_samples(mpa);
+        switch (format) {
+        case AF_FORMAT_FLOAT:
+            for (int s = 0; s < total; s++)
+                sanitizef(((float *)ptr)[s]);
+            break;
+        case AF_FORMAT_DOUBLE:
+            for (int s = 0; s < total; s++)
+                sanitizef(((double *)ptr)[s]);
+            break;
+        }
+    }
+}
+
 // Return the timestamp of the sample just after the end of this frame.
 double mp_aframe_end_pts(struct mp_aframe *f)
 {

audio/aframe.h

@@ -60,6 +60,7 @@ char *mp_aframe_format_str_buf(char *buf, size_t buf_size, struct mp_aframe *fmt
 #define mp_aframe_format_str(fmt) mp_aframe_format_str_buf((char[32]){0}, 32, (fmt))
 
 void mp_aframe_skip_samples(struct mp_aframe *f, int samples);
+void mp_aframe_sanitize_float(struct mp_aframe *f);
 double mp_aframe_end_pts(struct mp_aframe *f);
 double mp_aframe_duration(struct mp_aframe *f);
 void mp_aframe_clip_timestamps(struct mp_aframe *f, double start, double end);

audio/decode/ad_lavc.c

@@ -260,6 +260,9 @@ static int receive_frame(struct mp_filter *da, struct mp_frame *out)
         priv->trim_samples -= trim;
     }
 
+    // Strip possibly bogus float values like Infinity, NaN, denormalized
+    mp_aframe_sanitize_float(mpframe);
+
     if (mp_aframe_get_size(mpframe) > 0) {
         *out = MAKE_FRAME(MP_FRAME_AUDIO, mpframe);
     } else {