Hi, list

I write a decode for efr decode for TCH,but there some bug, and I have not a debug device, Can someone help me find the problem, Thanks!

static void process_tch_efr(struct osmocom_ms *ms,struct l1ctl_burst_ind *bi) { int16_t rx_dbm; uint16_t arfcn; uint32_t fn,B; uint8_t cbits, tn, lch_idx; int ul, bid, i, k, length; sbit_t *bursts, mC[456]; ubit_t steal_bit[2], bt[114],convu[189],convd[189],tch_raw[260],TCHW[260],EFRBits[244],EFRAMR[8 + 244];

pbit_t voice[33]; /* Get params (Only for SDCCH and SACCH/{4,8,F,H}) */ arfcn = ntohs(bi->band_arfcn); rx_dbm = rxlev2dbm(bi->rx_level);

fn = ntohl(bi->frame_nr); ul = !!(arfcn & ARFCN_UPLINK);

cbits = bi->chan_nr >> 3; tn = bi->chan_nr & 7;

B = -1;

if((fn%13)%4 == 0) flag= 1;

if(!flag) return;

//B = count_tch % 8; B = (fn % 13) % 8; printf("fn % 26 = %d, fn % 13 = %d,B = %d\n",fn%26 ,fn%13 ,B); if (B == -1) return;

/* Unpack (ignore hu/hl) */ osmo_pbit2ubit_ext(bt, 0, bi->bits, 0, 57, 0); osmo_pbit2ubit_ext(bt, 57, bi->bits, 57, 57, 0); //osmo_pbit2ubit_ext(steal_bit, 0 , bi->bits, 114 , 2 , 0); //printf("steal_bit %x , %x\n",steal_bit[0],steal_bit[1]); /* save stealing flags */ hl[B] = !!(bi->bits[14] & 0x10); // hl 57 hu[B] = !!(bi->bits[14] & 0x20); // hu 58 printf("steal_bit %x , %x\n", hl[B],hu[B]);

/* Convert to softbits */ for (i=0; i<114; i++) app_state.mI[B][i] = bt[i] ? - (bi->snr >> 1) : (bi->snr >> 1);

count_tch++; // Deinterleave according to the diagonal "phase" of B. // See GSM 05.03 3.1.3. // Deinterleaves i[] to c[] if((B % 4 ==3)&&(count_tch >= 7)){

if(B == 3) { if(!hl[0] && !hl[1] && !hl[2] && !hl[3] && !hu[4] && !hu[5] && !hu[6] && !hu[7]) { tch_deinterleave(mC, 4); } else if(hl[0] && hl[1] && hl[2] && hl[3] && hu[4] && hu[5] && hu[6] && hu[7]) { printf(" may be FACCH.\n"); return; }else{ printf("not a speech frame.\n"); return; } }else{ if(!hl[4] && !hl[5] && !hl[6] && !hl[7] && !hu[0] && !hu[1] && !hu[2] && !hu[3]) { tch_deinterleave(mC,0); } else if(hl[4] && hl[5] && hl[6] && hl[7] && hu[0] && hu[1] && hu[2] && hu[3]) { printf(" may be FACCH.\n"); return; }else{ printf("not a speech frame.\n"); return; } }

//mC is soft bit, and must convert to ubit type for (k = 0; k < 78; k++) {

if(mC[378 + k] < 0){ tch_raw[182 + k] = 1; }else{ tch_raw[182 + k] = 0; }

} osmo_conv_decode(&conv_tch_afs_12_2, mC, convu);

// 3.1.2.1 // copy class 1 bits u[] to d[] for (k = 0; k <= 90; k++) { convd[2*k] = convu[k]; convd[2*k+1] = convu[184-k]; } memcpy(tch_raw,convd,182); // the last 78 bit has been stored!

//now only process EFR or AMR 12_2, fix me! tch_unmap(gsm660_bitorder, 260, TCHW, tch_raw);

// Remove repeating bits and CRC to get raw EFR frame (244 bits) for (k=0; k<71; k++) EFRBits[k] = TCHW[k]; for (k=73; k<123; k++) EFRBits[k-2] = TCHW[k]; for (k=125; k<178; k++) EFRBits[k-4] = TCHW[k]; for (k=180; k<230; k++) EFRBits[k-6] = TCHW[k]; for (k=232; k<252; k++) EFRBits[k-8] = TCHW[k];

// Map bits as AMR 12.2k tch_map(gsm690_12_2_bitorder, 244, EFRAMR + 8,EFRBits); fillField(EFRAMR, 0, 0x3c, 8);

length = osmo_ubit2pbit_ext(voice, 0, EFRAMR, 0, 8 + gsm690_12_2_len, 0);

fwrite(voice, 1, length, d_speech_file); } }

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