Rewrite atomic float helpers, fix 64-bits big endian support

include/vlc_atomic.h

@@ -362,21 +362,22 @@ static inline uintptr_t vlc_atomic_compare_swap(vlc_atomic_t *atom,
     return u;
 }
 
+typedef atomic_uint_least32_t vlc_atomic_float;
+
 /** Helper to retrieve a single precision from an atom. */
-static inline float vlc_atomic_getf(vlc_atomic_t *atom)
+static inline float vlc_atomic_loadf(vlc_atomic_float *atom)
 {
-    union { float f; uintptr_t i; } u;
-    u.i = vlc_atomic_get(atom);
+    union { float f; uint32_t i; } u;
+    u.i = atomic_load(atom);
     return u.f;
 }
 
 /** Helper to store a single precision into an atom. */
-static inline float vlc_atomic_setf(vlc_atomic_t *atom, float f)
+static inline void vlc_atomic_storef(vlc_atomic_float *atom, float f)
 {
-    union { float f; uintptr_t i; } u;
+    union { float f; uint32_t i; } u;
     u.f = f;
-    vlc_atomic_set(atom, u.i);
-    return f;
+    atomic_store(atom, u.i);
 }
 
 #endif

src/audio_output/volume.c

@@ -37,7 +37,7 @@ struct aout_volume
 {
     audio_volume_t object;
     audio_replay_gain_t replay_gain;
-    vlc_atomic_t gain_factor;
+    vlc_atomic_float gain_factor;
     float output_factor;
     module_t *module;
 };
@@ -135,7 +135,7 @@ int aout_volume_Amplify(aout_volume_t *vol, block_t *block)
         return -1;
 
     float amp = vol->output_factor
-              * vlc_atomic_getf (&vol->gain_factor);
+              * vlc_atomic_loadf (&vol->gain_factor);
 
     vol->object.amplify(&vol->object, block, amp);
     return 0;
@@ -197,7 +197,7 @@ static int ReplayGainCallback (vlc_object_t *obj, char const *var,
     aout_volume_t *vol = data;
     float multiplier = aout_ReplayGainSelect(obj, val.psz_string,
                                              &vol->replay_gain);
-    vlc_atomic_setf (&vol->gain_factor, multiplier);
+    vlc_atomic_storef (&vol->gain_factor, multiplier);
     VLC_UNUSED(var); VLC_UNUSED(oldval);
     return VLC_SUCCESS;
 }