floatdsp: move butterflies_float from dsputil to avfloatdsp.

[ffmpeg] / libavcodec / ac3dsp.h

diff --git a/libavcodec/ac3dsp.h b/libavcodec/ac3dsp.h
index eeaa56cbbf7b9310504a6294e48376727d81e9b8..882eb7681aced6fdb84c2c10e856dd6f13192494 100644 (file)
--- a/libavcodec/ac3dsp.h
+++ b/libavcodec/ac3dsp.h
@@ -24,6 +24,12 @@
 
 #include <stdint.h>
 
+/**
+ * Number of mantissa bits written for each bap value.
+ * bap values with fractional bits are set to 0 and are calculated separately.
+ */
+extern const uint16_t ff_ac3_bap_bits[16];
+
 typedef struct AC3DSPContext {
     /**
      * Set each encoded exponent in a block to the minimum of itself and the
@@ -81,6 +87,47 @@ typedef struct AC3DSPContext {
      *            constraints: multiple of 32 greater than zero
      */
     void (*float_to_fixed24)(int32_t *dst, const float *src, unsigned int len);
+
+    /**
+     * Calculate bit allocation pointers.
+     * The SNR is the difference between the masking curve and the signal.  AC-3
+     * uses this value for each frequency bin to allocate bits.  The snroffset
+     * parameter is a global adjustment to the SNR for all bins.
+     *
+     * @param[in]  mask       masking curve
+     * @param[in]  psd        signal power for each frequency bin
+     * @param[in]  start      starting bin location
+     * @param[in]  end        ending bin location
+     * @param[in]  snr_offset SNR adjustment
+     * @param[in]  floor      noise floor
+     * @param[in]  bap_tab    look-up table for bit allocation pointers
+     * @param[out] bap        bit allocation pointers
+     */
+    void (*bit_alloc_calc_bap)(int16_t *mask, int16_t *psd, int start, int end,
+                               int snr_offset, int floor,
+                               const uint8_t *bap_tab, uint8_t *bap);
+
+    /**
+     * Update bap counts using the supplied array of bap.
+     *
+     * @param[out] mant_cnt   bap counts for 1 block
+     * @param[in]  bap        array of bap, pointing to start coef bin
+     * @param[in]  len        number of elements to process
+     */
+    void (*update_bap_counts)(uint16_t mant_cnt[16], uint8_t *bap, int len);
+
+    /**
+     * Calculate the number of bits needed to encode a set of mantissas.
+     *
+     * @param[in] mant_cnt    bap counts for all blocks
+     * @return                mantissa bit count
+     */
+    int (*compute_mantissa_size)(uint16_t mant_cnt[6][16]);
+
+    void (*extract_exponents)(uint8_t *exp, int32_t *coef, int nb_coefs);
+
+    void (*downmix)(float **samples, float (*matrix)[2], int out_ch,
+                    int in_ch, int len);
 } AC3DSPContext;
 
 void ff_ac3dsp_init    (AC3DSPContext *c, int bit_exact);