ac3enc: add float_to_fixed24() with x86-optimized versions to AC3DSPContext

and use in scale_coefficients() for the floating-point AC-3 encoder.

1 files changed, 15 insertions, 2 deletions

diff --git a/libavcodec/ac3dsp.h b/libavcodec/ac3dsp.h
index 31a0af3..0a2dedf 100644
--- a/libavcodec/ac3dsp.h
+++ b/libavcodec/ac3dsp.h
@@ -68,9 +68,22 @@ typedef struct AC3DSPContext {
      *               constraints: range [0,31]
      */
     void (*ac3_rshift_int32)(int32_t *src, unsigned int len, unsigned int shift);
+
+    /**
+     * Convert an array of float in range [-1.0,1.0] to int32_t with range
+     * [-(1<<24),(1<<24)]
+     *
+     * @param dst destination array of int32_t.
+     *            constraints: 16-byte aligned
+     * @param src source array of float.
+     *            constraints: 16-byte aligned
+     * @param len number of elements to convert.
+     *            constraints: multiple of 32 greater than zero
+     */
+    void (*float_to_fixed24)(int32_t *dst, const float *src, unsigned int len);
 } AC3DSPContext;
 
-void ff_ac3dsp_init    (AC3DSPContext *c);
-void ff_ac3dsp_init_x86(AC3DSPContext *c);
+void ff_ac3dsp_init    (AC3DSPContext *c, int bit_exact);
+void ff_ac3dsp_init_x86(AC3DSPContext *c, int bit_exact);
 
 #endif /* AVCODEC_AC3DSP_H */