?? pcm.h
字號:
#define SIGN_BIT (0x80) /* Sign bit for a A-law byte. */
#define QUANT_MASK (0xf) /* Quantization field mask. */
#define NSEGS (8) /* Number of A-law segments. */
#define SEG_SHIFT (4) /* Left shift for segment number. */
#define SEG_MASK (0x70) /* Segment field mask. */
#define BIAS (0x84) /* Bias for linear code. */
unsigned char linear2alaw(short pcm_val);
short alaw2linear(unsigned char a_val);
unsigned char linear2ulaw(int pcm_val); /* 2's complement (16-bit range) */
int ulaw2linear(unsigned char u_val);
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