Parity bit calculation routine for G.729

Originally committed as revision 15154 to svn://svn.ffmpeg.org/ffmpeg/trunk
2008-09-02 17:15:28 +00:00 · 2008-09-02 17:15:28 +00:00 · d3bb8ad7af
parent d0b41d8931
commit d3bb8ad7af
1 changed files with 8 additions and 0 deletions
--- a/libavcodec/g729dec.c
+++ b/libavcodec/g729dec.c
@ -71,6 +71,14 @@ static inline uint16_t g729_random(uint16_t value)
    return 31821 * value + 13849;
 }

+/**
+ * Get parity bit of bit 2..7
+ */
+static inline int g729_get_parity(uint8_t value)
+{
+   return (0x6996966996696996ULL >> (value >> 2)) & 1;
+}
+
 AVCodec g729_decoder =
 {
    "g729",