It has been replaced by C11 stdatomic.h and is now unused.

[ffmpeg] / libavutil / common.h

diff --git a/libavutil/common.h b/libavutil/common.h
index 8142b31fdbb20359885edf47dcdd5304cfb5b95a..5e0382827b0832d0d4bf4cf8c6daeae96b6a45f0 100644 (file)
--- a/libavutil/common.h
+++ b/libavutil/common.h
@@ -260,13 +260,37 @@ static av_always_inline int av_sat_add32_c(int a, int b)
  *
  * @param  a first value
  * @param  b value doubled and added to a
- * @return sum with signed saturation
+ * @return sum sat(a + sat(2*b)) with signed saturation
  */
 static av_always_inline int av_sat_dadd32_c(int a, int b)
 {
     return av_sat_add32(a, av_sat_add32(b, b));
 }
 
+/**
+ * Subtract two signed 32-bit values with saturation.
+ *
+ * @param  a one value
+ * @param  b another value
+ * @return difference with signed saturation
+ */
+static av_always_inline int av_sat_sub32_c(int a, int b)
+{
+    return av_clipl_int32((int64_t)a - b);
+}
+
+/**
+ * Subtract a doubled value from another value with saturation at both stages.
+ *
+ * @param  a first value
+ * @param  b value doubled and subtracted from a
+ * @return difference sat(a - sat(2*b)) with signed saturation
+ */
+static av_always_inline int av_sat_dsub32_c(int a, int b)
+{
+    return av_sat_sub32(a, av_sat_add32(b, b));
+}
+
 /**
  * Clip a float value into the amin-amax range.
  * @param a value to clip
@@ -513,6 +537,12 @@ static av_always_inline av_const int av_parity_c(uint32_t v)
 #ifndef av_sat_dadd32
 #   define av_sat_dadd32    av_sat_dadd32_c
 #endif
+#ifndef av_sat_sub32
+#   define av_sat_sub32     av_sat_sub32_c
+#endif
+#ifndef av_sat_dsub32
+#   define av_sat_dsub32    av_sat_dsub32_c
+#endif
 #ifndef av_clipf
 #   define av_clipf         av_clipf_c
 #endif