Add functions to return library license and library configuration.

[ffmpeg] / libavcodec / acelp_vectors.h

diff --git a/libavcodec/acelp_vectors.h b/libavcodec/acelp_vectors.h
index a5e71fc128766d2ccbf0fc8b5084d6807e020989..a711160d4cb3bb973035f917ea8f3ff234d0d578 100644 (file)
--- a/libavcodec/acelp_vectors.h
+++ b/libavcodec/acelp_vectors.h
@@ -150,4 +150,48 @@ void ff_acelp_weighted_vector_sum(
         int shift,
         int length);
 
+/**
+ * float implementation of weighted sum of two vectors.
+ * @param out [out] result of addition
+ * @param in_a first vector
+ * @param in_b second vector
+ * @param weight_coeff_a first vector weight coefficient
+ * @param weight_coeff_a second vector weight coefficient
+ * @param length vectors length
+ *
+ * @note It is safe to pass the same buffer for out and in_a or in_b.
+ */
+void ff_weighted_vector_sumf(float *out, const float *in_a, const float *in_b,
+                             float weight_coeff_a, float weight_coeff_b, int length);
+
+/**
+ * Adaptative gain control (as used in AMR postfiltering)
+ *
+ * @param buf_out the input speech buffer
+ * @param speech_energ input energy
+ * @param size the input buffer size
+ * @param alpha exponential filter factor
+ * @param gain_mem a pointer to the filter memory (single float of size)
+ */
+void ff_adaptative_gain_control(float *buf_out, float speech_energ,
+                                int size, float alpha, float *gain_mem);
+
+/**
+ * Set the sum of squares of a signal by scaling
+ *
+ * @param out output samples
+ * @param in input samples
+ * @param sum_of_squares new sum of squares
+ * @param n number of samples
+ *
+ * @note If the input is zero (or its energy underflows), the output is zero.
+ *       This is the behavior of AGC in the AMR reference decoder. The QCELP
+ *       reference decoder seems to have undefined behavior.
+ *
+ * TIA/EIA/IS-733 2.4.8.3-2/3/4/5, 2.4.8.6
+ * 3GPP TS 26.090 6.1 (6)
+ */
+void ff_scale_vector_to_given_sum_of_squares(float *out, const float *in,
+                                             float sum_of_squares, const int n);
+
 #endif /* AVCODEC_ACELP_VECTORS_H */