47 lines
746 B
C
47 lines
746 B
C
/**
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* @file re_g711.h Interface to G.711 codec
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*
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* Copyright (C) 2010 Creytiv.com
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*/
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extern const uint8_t g711_l2u[4096];
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extern const uint8_t g711_l2A[2048];
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extern const int16_t g711_u2l[256];
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extern const int16_t g711_A2l[256];
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static inline uint8_t g711_pcm2ulaw(int16_t l)
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{
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const uint8_t mask = (l < 0) ? 0x7f : 0xff;
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if (l < 0)
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l = -l;
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if (l < 4)
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return 0xff & mask;
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l -= 4;
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l >>= 3;
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return g711_l2u[l] & mask;
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}
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static inline uint8_t g711_pcm2alaw(int16_t l)
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{
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const uint8_t mask = (l < 0) ? 0x7f : 0xff;
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if (l < 0)
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l = -l;
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l >>= 4;
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return g711_l2A[l] & mask;
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}
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static inline int16_t g711_ulaw2pcm(uint8_t u)
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{
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return g711_u2l[u];
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}
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static inline int16_t g711_alaw2pcm(uint8_t a)
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{
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return g711_A2l[a];
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}
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