static void adx_encode(unsigned char *adx,const short *wav, ADXChannelState *prev) { int scale; int i; int s0,s1,s2,d; int max=0; int min=0; int data[32]; s1 = prev->s1; s2 = prev->s2; for(i=0;i<32;i++) { s0 = wav[i]; d = ((s0<<14) - SCALE1*s1 + SCALE2*s2)/BASEVOL; data[i]=d; if (max<d) max=d; if (min>d) min=d; s2 = s1; s1 = s0; } prev->s1 = s1; prev->s2 = s2; /* -8..+7 */ if (max==0 && min==0) { memset(adx,0,18); return; } if (max/7>-min/8) scale = max/7; else scale = -min/8; if (scale==0) scale=1; AV_WB16(adx, scale); for(i=0;i<16;i++) { adx[i+2] = ((data[i*2]/scale)<<4) | ((data[i*2+1]/scale)&0xf); } }
static void adx_encode(unsigned char *adx,const short *wav, ADXChannelState *prev) { int scale; int i; int s0,s1,s2,d; int max=0; int min=0; int data[32]; s1 = prev->s1; s2 = prev->s2; for(i=0;i<32;i++) { s0 = wav[i]; d = ((s0<<14) - SCALE1*s1 + SCALE2*s2)/BASEVOL; data[i]=d; if (max<d) max=d; if (min>d) min=d; s2 = s1; s1 = s0; } prev->s1 = s1; prev->s2 = s2;   if (max==0 && min==0) { memset(adx,0,18); return; } if (max/7>-min/8) scale = max/7; else scale = -min/8; if (scale==0) scale=1; AV_WB16(adx, scale); for(i=0;i<16;i++) { adx[i+2] = ((data[i*2]/scale)<<4) | ((data[i*2+1]/scale)&0xf); } }