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Defines | |
| #define | AST_LIN2MU(a) (__ast_lin2mu[((unsigned short)(a)) >> 2]) |
| #define | AST_MULAW(a) (__ast_mulaw[(a)]) |
Functions | |
| void | ast_ulaw_init (void) |
| Set up mu-law conversion table. | |
Variables | |
| unsigned char | __ast_lin2mu [16384] |
| short | __ast_mulaw [256] |
Definition in file ulaw.h.
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Definition at line 40 of file ulaw.h. Referenced by fill_rxgain(), fill_txgain(), i4l_write(), lintoulaw_framein(), load_module(), and make_tone_burst(). |
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Definition at line 41 of file ulaw.h. Referenced by ast_dsp_process(), fill_rxgain(), fill_txgain(), i4l_read(), load_module(), tdd_feed(), and ulawtolin_framein(). |
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Set up mu-law conversion table. To init the ulaw to slinear conversion stuff, this needs to be run. Definition at line 84 of file ulaw.c. References __ast_lin2mu, __ast_mulaw, and linear2ulaw(). Referenced by main(). 00085 {
00086 int i;
00087 for(i = 0;i < 256;i++) {
00088 short mu,e,f,y;
00089 static short etab[]={0,132,396,924,1980,4092,8316,16764};
00090
00091 mu = 255-i;
00092 e = (mu & 0x70)/16;
00093 f = mu & 0x0f;
00094 y = f * (1 << (e + 3));
00095 y += etab[e];
00096 if (mu & 0x80) y = -y;
00097 __ast_mulaw[i] = y;
00098 }
00099 /* set up the reverse (mu-law) conversion table */
00100 for(i = -32768; i < 32768; i++) {
00101 __ast_lin2mu[((unsigned short)i) >> 2] = linear2ulaw(i);
00102 }
00103
00104 }
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Definition at line 35 of file ulaw.c. Referenced by ast_ulaw_init(). |
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help Definition at line 36 of file ulaw.c. Referenced by ast_ulaw_init(). |
1.4.2