| /* -*- c++ -*- */ |
| /* |
| * @file |
| * @author Roman Khassraf <rkhassraf@gmail.com> |
| * @section LICENSE |
| * |
| * Gr-gsm is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 3, or (at your option) |
| * any later version. |
| * |
| * Gr-gsm is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with gr-gsm; see the file COPYING. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <gnuradio/io_signature.h> |
| #include <grgsm/gsmtap.h> |
| #include "stdio.h" |
| #include "tch_f_decoder_impl.h" |
| |
| #define DATA_BYTES 23 |
| |
| namespace gr { |
| namespace gsm { |
| |
| tch_f_decoder::sptr |
| tch_f_decoder::make(tch_mode mode, const std::string &file) |
| { |
| return gnuradio::get_initial_sptr |
| (new tch_f_decoder_impl(mode, file)); |
| } |
| |
| /* |
| * Constructor |
| */ |
| tch_f_decoder_impl::tch_f_decoder_impl(tch_mode mode, const std::string &file) |
| : gr::block("tch_f_decoder", |
| gr::io_signature::make(0, 0, 0), |
| gr::io_signature::make(0, 0, 0)), |
| d_tch_mode(mode), |
| d_collected_bursts_num(0) |
| { |
| d_speech_file = fopen( file.c_str(), "wb" ); |
| if (d_speech_file == NULL) |
| { |
| throw std::runtime_error("TCH/F Decoder: can't open file\n"); |
| } |
| |
| if (d_tch_mode == MODE_SPEECH_EFR) |
| { |
| fwrite(amr_nb_magic, 1, 6, d_speech_file); |
| } |
| |
| int j, k, B; |
| for (k = 0; k < CONV_SIZE; k++) |
| { |
| B = k % 8; |
| j = 2 * ((49 * k) % 57) + ((k % 8) / 4); |
| interleave_trans[k] = B * 114 + j; |
| } |
| |
| //setup input/output ports |
| message_port_register_in(pmt::mp("bursts")); |
| set_msg_handler(pmt::mp("bursts"), boost::bind(&tch_f_decoder_impl::decode, this, _1)); |
| message_port_register_out(pmt::mp("msgs")); |
| } |
| |
| tch_f_decoder_impl::~tch_f_decoder_impl() |
| { |
| } |
| |
| void tch_f_decoder_impl::decode(pmt::pmt_t msg) |
| { |
| d_bursts[d_collected_bursts_num] = msg; |
| d_collected_bursts_num++; |
| |
| bool stolen = false; |
| |
| if (d_collected_bursts_num == 8) |
| { |
| unsigned char iBLOCK[2*BLOCKS*iBLOCK_SIZE]; |
| SoftVector mC(CONV_SIZE); |
| SoftVector mClass1_c(mC.head(378)); |
| SoftVector mClass2_c(mC.segment(378, 78)); |
| BitVector mTCHU(189); |
| BitVector mTCHD(260); |
| BitVector mClass1A_d(mTCHD.head(50)); |
| ViterbiR2O4 mVCoder; |
| |
| d_collected_bursts_num = 0; |
| |
| // reorganize data |
| for (int ii = 0; ii < 8; ii++) |
| { |
| pmt::pmt_t header_plus_burst = pmt::cdr(d_bursts[ii]); |
| int8_t * burst_bits = (int8_t *)(pmt::blob_data(header_plus_burst))+sizeof(gsmtap_hdr); |
| |
| for (int jj = 0; jj < 57; jj++) |
| { |
| iBLOCK[ii*114+jj] = burst_bits[jj + 3]; |
| iBLOCK[ii*114+jj+57] = burst_bits[jj + 88]; //88 = 3+57+1+26+1 |
| } |
| |
| if ((ii <= 3 && static_cast<int>(burst_bits[87]) == 1) || (ii >= 4 && static_cast<int>(burst_bits[60]) == 1)) |
| { |
| stolen = true; |
| } |
| } |
| |
| // deinterleave |
| for (int k = 0; k < CONV_SIZE; k++) |
| { |
| mC[k] = iBLOCK[interleave_trans[k]]; |
| } |
| |
| // Decode stolen frames as FACCH/F |
| if (stolen) |
| { |
| BitVector mU(228); |
| BitVector mP(mU.segment(184,40)); |
| BitVector mD(mU.head(184)); |
| BitVector mDP(mU.head(224)); |
| Parity mBlockCoder(0x10004820009ULL, 40, 224); |
| |
| // mC.decode(mVCoder, mU); |
| mVCoder.decode(mC, mU); |
| mP.invert(); |
| |
| unsigned syndrome = mBlockCoder.syndrome(mDP); |
| |
| if (syndrome == 0) |
| { |
| unsigned char outmsg[27]; |
| unsigned char sbuf_len=224; |
| int i, j, c, pos=0; |
| for(i = 0; i < sbuf_len; i += 8) { |
| for(j = 0, c = 0; (j < 8) && (i + j < sbuf_len); j++){ |
| c |= (!!mU.bit(i + j)) << j; |
| } |
| outmsg[pos++] = c & 0xff; |
| } |
| |
| pmt::pmt_t first_header_plus_burst = pmt::cdr(d_bursts[0]); |
| gsmtap_hdr * header = (gsmtap_hdr *)pmt::blob_data(first_header_plus_burst); |
| header->type = GSMTAP_TYPE_UM; |
| int8_t * header_content = (int8_t *)header; |
| int8_t header_plus_data[sizeof(gsmtap_hdr)+DATA_BYTES]; |
| memcpy(header_plus_data, header_content, sizeof(gsmtap_hdr)); |
| memcpy(header_plus_data+sizeof(gsmtap_hdr), outmsg, DATA_BYTES); |
| |
| pmt::pmt_t msg_binary_blob = pmt::make_blob(header_plus_data,DATA_BYTES+sizeof(gsmtap_hdr)); |
| pmt::pmt_t msg_out = pmt::cons(pmt::PMT_NIL, msg_binary_blob); |
| |
| message_port_pub(pmt::mp("msgs"), msg_out); |
| } |
| } |
| |
| mVCoder.decode(mClass1_c, mTCHU); |
| // mClass1_c.decode(mVCoder, mTCHU); |
| mClass2_c.sliced().copyToSegment(mTCHD, 182); |
| |
| // 3.1.2.1 |
| // copy class 1 bits u[] to d[] |
| for (unsigned k = 0; k <= 90; k++) { |
| mTCHD[2*k] = mTCHU[k]; |
| mTCHD[2*k+1] = mTCHU[184-k]; |
| } |
| |
| Parity mTCHParity(0x0b, 3, 50); |
| |
| // 3.1.2.1 |
| // check parity of class 1A |
| unsigned sentParity = (~mTCHU.peekField(91, 3)) & 0x07; |
| //unsigned calcParity = mTCHD.head(50).parity(mTCHParity) & 0x07; |
| unsigned calcParity = mClass1A_d.parity(mTCHParity) & 0x07; |
| |
| // 3.1.2.2 |
| // Check the tail bits, too. |
| unsigned tail = mTCHU.peekField(185, 4); |
| |
| bool good = (sentParity == calcParity) && (tail == 0); |
| |
| if (good) |
| { |
| unsigned char mTCHFrame[33]; |
| unsigned int mTCHFrameLength; |
| |
| if (d_tch_mode == MODE_SPEECH_FR) // GSM-FR |
| { |
| // Undo Um's importance-sorted bit ordering. |
| // See GSM 05.03 3.1 and Tablee 2. |
| VocoderFrame mVFrame; |
| |
| BitVector payload = mVFrame.payload(); |
| mTCHD.unmap(GSM::g610BitOrder, 260, payload); |
| mVFrame.pack(mTCHFrame); |
| mTCHFrameLength = 33; |
| } |
| else if (d_tch_mode == MODE_SPEECH_EFR) // GSM-EFR / AMR 12.2 |
| { |
| VocoderAMRFrame mVFrameAMR; |
| |
| BitVector payload = mVFrameAMR.payload(); |
| BitVector TCHW(260), EFRBits(244); |
| |
| // Undo Um's EFR bit ordering. |
| mTCHD.unmap(GSM::g660BitOrder, 260, TCHW); |
| |
| // Remove repeating bits and CRC to get raw EFR frame (244 bits) |
| for (unsigned k=0; k<71; k++) |
| EFRBits[k] = TCHW[k] & 1; |
| |
| for (unsigned k=73; k<123; k++) |
| EFRBits[k-2] = TCHW[k] & 1; |
| |
| for (unsigned k=125; k<178; k++) |
| EFRBits[k-4] = TCHW[k] & 1; |
| |
| for (unsigned k=180; k<230; k++) |
| EFRBits[k-6] = TCHW[k] & 1; |
| |
| for (unsigned k=232; k<252; k++) |
| EFRBits[k-8] = TCHW[k] & 1; |
| |
| // Map bits as AMR 12.2k |
| EFRBits.map(GSM::g690_12_2_BitOrder, 244, payload); |
| |
| // Put the whole frame (hdr + payload) |
| mVFrameAMR.pack(mTCHFrame); |
| mTCHFrameLength = 32; |
| } |
| fwrite(mTCHFrame, 1 , mTCHFrameLength, d_speech_file); |
| } |
| } |
| } |
| } /* namespace gsm */ |
| } /* namespace gr */ |
| |