lavc/g729dec: use ff_parity()

libavcodec/g729dec.c

@@ -180,14 +180,6 @@ static inline uint16_t g729_prng(uint16_t value)
     return 31821 * value + 13849;
 }
 
-/**
- * Get parity bit of bit 2..7
- */
-static inline int get_parity(uint8_t value)
-{
-   return (0x6996966996696996ULL >> (value >> 2)) & 1;
-}
-
 /**
  * Decodes LSF (Line Spectral Frequencies) from L0-L3 (3.2.4).
  * @param[out] lsfq (2.13) quantized LSF coefficients
@@ -480,7 +472,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr,
 
         ac_index      = get_bits(&gb, format->ac_index_bits[i]);
         if(!i && format->parity_bit)
-            bad_pitch = get_parity(ac_index) == get_bits1(&gb);
+            bad_pitch = ff_parity(ac_index >> 2) == get_bits1(&gb);
         fc_indexes    = get_bits(&gb, format->fc_indexes_bits);
         pulses_signs  = get_bits(&gb, format->fc_signs_bits);
         gc_1st_index  = get_bits(&gb, format->gc_1st_index_bits);