search for: neg32

Hello, I am from a small Czech software company (circletech.net) working on software for mobile phones. We are currently starting a development of an Voice IP software, and consider using speex for voice compression and decompression. The software will be Symbian OS C++ program. Is there anyone who has actually used speex Symbian OS port for realtime voice compression and decompression on mobile

...to have a NORM macro that maps to _norm() on TI platforms or whatever the processor specific instruction is available. In filters.c normalize16() searches for the largest value using the following loop: for (i=0;i<len;i++) { spx_sig_t tmp = x[i]; if (tmp<0) tmp = NEG32(tmp); if (tmp >= max_val) max_val = tmp; } It should really use tmp=NEG32(tmp+1), since the range of negative fixed point has one more number for a given number of bits. (and that's what all the shifting is about) This same code fragment is in normalize16() and compute_rms...

..._word16_t error = ac[0]; for (i = 0; i < p; i++) lpc[i] = 0; if (ac[0] == 0) { //for (i = 0; i < p; i++) // lpc[i] = 0; return 0; } for (i = 0; i < p; i++) { /* Sum up this iteration's reflection coefficient */ spx_word32_t rr = NEG32(SHL32(EXTEND32(ac[i + 1]),13)); for (j = 0; j < i; j++) rr = SUB32(rr,MULT16_16(lpc[j],ac[i - j])); #ifdef FIXED_POINT // stop calculation if error < 30 if ( error <= 30 ) { return error; } //r = DIV32_16(rr+PSHR32(error,1),ADD16(error,10 )); r = DIV3...

You might not be doing anything wrong. Speex is stateful and can get into a bad state sometimes. It's happened to me too, but not recently. And I've seen such bugs reported on this list and fixed. I suggest several approaches to solving the problem: 1) Try compiling Speex without compiler optimizations and see if the problem still occurs. Most likely it will, but this is an

...oat spx_word32_t; typedef float spx_word64_t; #define LPC_SCALING 1. #define SIG_SCALING 1. #define LSP_SCALING 1. #define GAMMA_SCALING 1. #define GAIN_SCALING 1. #define GAIN_SCALING_1 1. #define LPC_SHIFT 0 #define SIG_SHIFT 0 #define VERY_SMALL 1e-15 #define NEG16(x) (-(x)) #define NEG32(x) (-(x)) #define EXTRACT16(x) (x) #define EXTEND32(x) (x) #define SHR16(a,shift) (a) #define SHL16(a,shift) (a) #define SHR32(a,shift) (a) #define SHL32(a,shift) (a) #define PSHR16(a,shift) (a) #define PSHR32(a,shift) (a) #define SATURATE16(x,a) (x) #define SATURATE32(x,a) (x) #define PSHR(a,shif...