Resampling module for USRP. Not completed. In progress.

git-svn-id: http://svn.eurecom.fr/openair4G/trunk@5085 818b1a75-f10b-46b9-bf7c-635c3b92a50f

targets/ARCH/USRP/USERSPACE/LIB/Makefile_tmp.inc

+# compiles the openair_usrp
+
+#OPENAIRTARGETS_DIR ?=../../../..
+
+#OPENAIROBJS += $(OPENAIRTARGETS_DIR)/ARCH/USRP/USERSPACE/LIB/openair0_lib.o
+#CFLAGS += -I$(OPENAIRTARGETS_DIR)/ARCH/USRP/USERSPACE/LIB -I$(OPENAIRTARGETS_DIR)/ARCH/USRP/DEFS
+
+
+#example: example.o $(OPENAIROBJS) 
+#	gcc -o $@ $(CFLAGS) -lm $(OPENAIROBJS) $<
+
+#openair_usrp.o:
+#	$(CXX) -c openair_usrp.cpp -o openair_usrp.o
+
+#clean:
+#	rm -f *.o *~
+#a	rm -f example
+
+USRP_OBJ += $(OPENAIR_TARGETS)/ARCH/USRP/USERSPACE/LIB/openair_usrp.o
+PPS_OBJ += $(OPENAIR_TARGETS)/ARCH/USRP/USERSPACE/LIB/polyphaseResample.o
+USRP_FILE_OBJ += $(OPENAIR_TARGETS)/ARCH/USRP/USERSPACE/LIB/openair_usrp.cpp
+PPS_FILE_OBJ += $(OPENAIR_TARGETS)/ARCH/USRP/USERSPACE/LIB/polyphaseResample.cpp
+USRP_CFLAGS += -I$(OPENAIR_TARGETS)/ARCH/USRP/USERSPACE/LIB/

targets/ARCH/USRP/USERSPACE/LIB/def_tmp.h

+#include <stdarg.h>
+
+#define SAMPLES_PER_FRM 76800
+#define SAMPLES_PER_FRM_USRP 62500
+#define SAMPLES_PER_SLOT 3840
+#define SAMPLES_PER_SLOT_USRP 6250
+#define HW_offset 32
+#define N_slot_offset 4
+#define T_start 3840*20*100
+
+void format_printf(int flag,const char * fmt, ...)
+{
+	if(flag)
+	{
+		va_list args;
+		va_start(args,fmt);
+		vprintf(fmt,args);
+		va_end(args);
+	}
+}

targets/ARCH/USRP/USERSPACE/LIB/openair_usrp_tmp.cpp

+#include <string.h>
+#include <pthread.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <uhd/utils/thread_priority.hpp>
+#include <uhd/usrp/multi_usrp.hpp>
+#include <boost/format.hpp>
+#include <iostream>
+#include <complex>
+#include <fstream>
+#include <cmath>
+#include "def.h"
+
+// --------------------------------
+// headers for polyphaseResample
+// --------------------------------
+#include "polyphaseResample.h"
+#include "coeff_3072_to_25.h"
+#include "coeff_25_to_3072.h"
+
+using namespace std;
+using std::ofstream;
+using std::ifstream;
+
+// --------------------------------
+// contant variables
+// --------------------------------
+#define PI 3.1415926535898
+#define SAM_RATE 6.25e6 // 6.25e6 = 100e6/16
+#define DL_FREQ 880e6
+#define UL_FREQ 835e6
+
+// --------------------------------
+// variables for polyphaseResample
+// --------------------------------
+const int OUTRATE = 625;
+const int INRATE = 768;
+int *g_branch_table;
+int *g_offset_table;
+short Rx_history[625*2];
+short Tx_history[768*2];
+
+// --------------------------------
+// variables for USRP configuration
+// --------------------------------
+uhd::usrp::multi_usrp::sptr tx_usrp;
+uhd::usrp::multi_usrp::sptr rx_usrp;
+
+//create a send streamer and a receive streamer
+uhd::stream_args_t stream_args_short("sc16");//complex short
+uhd::stream_args_t stream_args_float("fc32");//complex float
+uhd::tx_streamer::sptr tx_stream;
+uhd::rx_streamer::sptr rx_stream;
+
+uhd::tx_metadata_t tx_md;
+uhd::rx_metadata_t rx_md;
+
+//setup variables and allocate buffer
+uhd::async_metadata_t async_md;
+
+double tx_timeout;
+double rx_timeout;
+
+double rx_freq;
+
+uhd::stream_cmd_t stream_cmd(uhd::stream_cmd_t::STREAM_MODE_START_CONTINUOUS);
+
+// --------------------------------
+// variables for OAI buffers
+// --------------------------------
+int oai_tx_buff[SAMPLES_PER_FRM];
+int oai_rx_buff[SAMPLES_PER_FRM];
+int oai_rx_buff_temp[SAMPLES_PER_FRM_USRP];
+int oai_tx_buff_temp[SAMPLES_PER_FRM_USRP];
+volatile unsigned long long tx_timestamp,rx_timestamp,clock_usrp,tmp_clock;
+volatile int w_pos_usrp_rcv = 0; // value range [0:76800-1]
+volatile int r_pos_usrp_send = 0; // value range [0:76800-1]
+volatile int w_slot_usrp_rcv, r_slot_usrp_send; // slot index for USRP thread. value range [0:19]
+volatile int r_slot_idx, t_slot_idx; // slot index for eNB thread. value range [0;19]
+volatile int send_slot_missed = 0;
+
+// --------------------------------
+// Debug and output control
+// --------------------------------
+int g_usrp_debug=0;
+int num_underflows=0;
+int num_overflows=0;
+int num_seq_errors=0;
+
+
+extern "C"
+{
+	void UHD_init(void);
+	void UHD_init_display(void);
+	void Init_send(void);
+	void Init_recv(void);
+	void send_data(int hw_slot_offset);
+	void recv_data(int hw_slot_offset);
+	void send_end(void);
+	void set_freq(int freq_offset);
+	char UE_flag;
+	void tx_errorcode_handler(void);
+	void sig_int_handler(void);
+}
+void Rx_resample(void);
+void Tx_resample(void);
+
+// --------------------------------
+// USRP initial 
+// --------------------------------
+void UHD_init(void)
+{
+	uhd::set_thread_priority_safe();
+	std::string args = "send_frame_size=3840,recv_frame_size=3840";
+	uhd::device_addrs_t device_addr = uhd::device::find(args);
+	if (device_addr.size() == 0 )
+	{
+		std::cerr<<"No USRP Device Found"<<std::endl;
+		exit(1);
+	}	
+	else
+		std::cout<<"USRP Device Found"<<std::endl<<device_addr[0].to_pp_string()<<std::endl;
+	tx_usrp = uhd::usrp::multi_usrp::make(args);
+	rx_usrp = uhd::usrp::multi_usrp::make(args);
+
+	tx_stream = tx_usrp->get_tx_stream(stream_args_short);
+	rx_stream = rx_usrp->get_rx_stream(stream_args_short);
+
+	//Lock mboard clocks
+	tx_usrp->set_clock_source("internal");
+	rx_usrp->set_clock_source("internal");
+
+	tx_usrp->set_tx_rate(SAM_RATE);
+	if(UE_flag)
+		tx_usrp->set_tx_freq(UL_FREQ);
+	else
+		tx_usrp->set_tx_freq(DL_FREQ);
+	tx_usrp->set_tx_gain(0);
+	tx_usrp->set_tx_bandwidth(25e6);
+	tx_usrp->set_tx_antenna("TX/RX");
+
+	rx_usrp->set_rx_rate(SAM_RATE);
+	if(UE_flag)
+	{
+		rx_usrp->set_rx_freq(DL_FREQ);
+		rx_freq = DL_FREQ;
+	}
+	else
+	{
+		rx_usrp->set_rx_freq(UL_FREQ);
+		rx_freq = UL_FREQ;
+	}
+	rx_usrp->set_rx_gain(0);
+	rx_usrp->set_rx_bandwidth(25e6);
+	rx_usrp->set_rx_antenna("RX2");
+
+	std::cout <<std::endl<< boost::format("Setting device timestamp to 0...") << std::endl;
+	tx_usrp->set_time_now(uhd::time_spec_t(0.0));
+	rx_usrp->set_time_now(uhd::time_spec_t(0.0));
+}
+
+// --------------------------------
+// USRP information display
+// --------------------------------
+void UHD_init_display(void)
+{
+	std::cout << std::endl<<boost::format("Actual TX sample rate: %fMSps...") % (tx_usrp->get_tx_rate()/1e6) << std::endl;
+	std::cout << boost::format("Actual RX sample rate: %fMSps...") % (rx_usrp->get_rx_rate()/1e6) << std::endl;
+
+	std::cout << boost::format("Actual TX frequency: %fGHz...") % (tx_usrp->get_tx_freq()/1e9) << std::endl;
+	std::cout << boost::format("Actual RX frequency: %fGHz...") % (rx_usrp->get_rx_freq()/1e9) << std::endl;
+
+	std::cout << boost::format("Actual TX gain: %f...") % (tx_usrp->get_tx_gain()) << std::endl;
+	std::cout << boost::format("Actual RX gain: %f...") % (rx_usrp->get_rx_gain()) << std::endl;
+
+	std::cout << boost::format("Actual TX bandwidth: %fM...") % (tx_usrp->get_tx_bandwidth()/1e6) << std::endl;
+	std::cout << boost::format("Actual RX bandwidth: %fM...") % (rx_usrp->get_rx_bandwidth()/1e6) << std::endl;
+
+	std::cout << boost::format("Actual TX antenna: %s...") % (tx_usrp->get_tx_antenna()) << std::endl;
+	std::cout << boost::format("Actual RX antenna: %s...") % (rx_usrp->get_rx_antenna()) << std::endl;
+
+	std::cout << boost::format("Device TX timestamp: %f...") % (tx_usrp->get_time_now().get_real_secs()) << std::endl;
+	std::cout << boost::format("Device RX timestamp: %f...") % (rx_usrp->get_time_now().get_real_secs()) << std::endl << std::endl;
+}
+
+// -----------------------
+//send init
+// -----------------------
+void Init_send(void)
+{
+	//reset send buffer
+	memset(oai_tx_buff , 0 , sizeof(oai_tx_buff));
+
+	//reset Tx_history
+	memset(Tx_history, 0, sizeof(Tx_history));
+
+	// the first slot sent shoud be the 0+N_slot_offset. 
+	r_slot_usrp_send = N_slot_offset; 
+	//send constantly
+	tx_md.start_of_burst = false;
+	tx_md.end_of_burst = false;
+	tx_md.has_time_spec = true;
+	tx_timestamp = T_start + r_slot_usrp_send * SAMPLES_PER_SLOT;
+	tx_md.time_spec = uhd::time_spec_t::from_ticks(tx_timestamp,SAM_RATE);
+	tx_timeout = tx_timestamp/SAM_RATE + 0.1;
+}
+
+// -----------------------
+//receive init
+// -----------------------
+void Init_recv(void)
+{
+	//reset receive buffer
+	memset(oai_rx_buff , 0 , sizeof(oai_rx_buff));
+
+	//reset Rx_history
+	memset(Rx_history, 0, sizeof(Rx_history));
+
+	// initialize the rx stream
+	stream_cmd.stream_now = false;//When true, the device will begin streaming ASAP. When false, the device will begin streaming at a time specified by time_spec. 
+	stream_cmd.num_samps = 0;
+	rx_timestamp = T_start + HW_offset;//Device timestamp and time of send sample 
+	stream_cmd.time_spec = uhd::time_spec_t::from_ticks(rx_timestamp,SAM_RATE);
+	rx_usrp->issue_stream_cmd(stream_cmd);
+
+	//the first call to recv() will block this many seconds before receiving
+	rx_timeout = rx_timestamp/SAM_RATE + 0.1; //timeout (delay before receive + padding)
+
+	// the first clock number = rx_timestamp
+	clock_usrp = rx_timestamp;
+	w_pos_usrp_rcv = 0;
+	w_slot_usrp_rcv = 19;
+}
+
+// -----------------------
+// send function
+// -----------------------
+void send_data(int hw_slot_offset)
+{
+
+	int diff;
+	// Handle the frame wrap-arround
+	if ((r_slot_usrp_send<4)&&(t_slot_idx>=16)){
+		diff = t_slot_idx - (r_slot_usrp_send + 20) ;
+	}
+	else if((r_slot_usrp_send>=16)&&(t_slot_idx<4)){
+		diff = (t_slot_idx + 20) - r_slot_usrp_send;
+	}
+	else{
+		diff = t_slot_idx - r_slot_usrp_send;
+	}
+	format_printf(g_usrp_debug, "[send] diff: %d\n",diff);
+	if (diff<0){}
+	else if (diff>1)
+	{
+		format_printf(g_usrp_debug, "Sending is late\n");
+		r_slot_usrp_send = t_slot_idx;
+		// count the missed sending slots
+		send_slot_missed += (diff - 1);
+	}
+	else // diff = 0,1
+	{
+		for (int ii=0;ii<diff+1;ii++)
+		{
+
+			format_printf(g_usrp_debug,"[send] r_usrp: %d t_slot: %d w_usrp: %d w_pos_usrp_rcv: %d\n", r_slot_usrp_send,t_slot_idx,w_slot_usrp_rcv, w_pos_usrp_rcv);
+			format_printf(g_usrp_debug,"[send] clock_usrp: %llu tx_timestamp: %llu\n", clock_usrp, tx_timestamp);
+
+			Tx_resample();
+
+			// sending
+			size_t num_tx_samps;
+			r_pos_usrp_send = (t_slot_idx * SAMPLES_PER_SLOT + hw_slot_offset) % SAMPLES_PER_FRM;
+			if((r_pos_usrp_send + SAMPLES_PER_SLOT) <= SAMPLES_PER_FRM)
+			{
+				memcpy((& oai_tx_buff_temp[0]) , (& oai_tx_buff[r_pos_usrp_send]) , SAMPLES_PER_SLOT*4 );
+				//num_tx_samps = tx_stream->send((& oai_tx_buff[r_pos_usrp_send]), SAMPLES_PER_SLOT_USRP, tx_md, tx_timeout);
+			}
+			else
+			{
+				int tmp_len = SAMPLES_PER_FRM - r_pos_usrp_send;
+				//num_tx_samps = tx_stream->send((& oai_tx_buff[r_pos_usrp_send]), tmp_len, tx_md, tx_timeout);
+				memcpy((& oai_tx_buff_temp[0]) , (& oai_tx_buff[r_pos_usrp_send]) , tmp_len*4 );
+				//num_tx_samps = tx_stream->send((& oai_tx_buff[0]),SAMPLES_PER_SLOT_USRP - tmp_len, tx_md, tx_timeout);
+				memcpy((& oai_tx_buff_temp[tmp_len]) , (& oai_tx_buff[0]) , (SAMPLES_PER_SLOT - tmp_len)*4 );
+			}
+	
+			num_tx_samps = tx_stream->send((& oai_tx_buff_temp[0]), SAMPLES_PER_SLOT_USRP, tx_md, tx_timeout);
+
+			//without timestamp
+			tx_md.has_time_spec = false;
+
+			tx_timeout = 0.1;
+
+			r_slot_usrp_send++;
+			if(r_slot_usrp_send==20) r_slot_usrp_send=0;
+
+		}
+	}
+}
+
+// --------------------------------
+// handle TX error codes
+// --------------------------------
+void tx_errorcode_handler(void){
+	if (not tx_stream->recv_async_msg(async_md)) {}
+	else{
+		switch(async_md.event_code){
+			case uhd::async_metadata_t::EVENT_CODE_BURST_ACK:
+				return;
+			case uhd::async_metadata_t::EVENT_CODE_UNDERFLOW:
+				format_printf(g_usrp_debug,"[send] USRP TX UNDERFLOW!\n");
+				num_underflows++;
+				break;
+			case uhd::async_metadata_t::EVENT_CODE_UNDERFLOW_IN_PACKET:
+				format_printf(g_usrp_debug,"[send] USRP TX UNDERFLOW IN_PACKET!\n");
+				break;
+			case uhd::async_metadata_t::EVENT_CODE_SEQ_ERROR:
+			case uhd::async_metadata_t::EVENT_CODE_SEQ_ERROR_IN_BURST:
+				num_seq_errors++;
+				break;
+			default:
+				//std::cerr << "Event code: " << async_md.event_code << std::endl;
+				//std::cerr << "Unexpected event on async recv, continuing..." << std::endl;
+				break;
+		}
+	}
+}
+// -----------------------
+// send end of burst
+// -----------------------
+void send_end()
+{
+	//send a mini EOB packet
+	tx_md.end_of_burst = true;
+	tx_stream->send("", 0, tx_md);
+	tx_md.end_of_burst = false;
+	format_printf(1,"num_underflows: %d   num_overflows: %d   num_seq_errors: %d\n",num_underflows,num_overflows,num_seq_errors);
+}
+
+// -----------------------
+// receive function
+// -----------------------
+void recv_data(int hw_slot_offset)
+{
+	size_t num_rx_samps;
+
+	//volatile unsigned long long tmp_clock;
+	num_rx_samps = rx_stream->recv((&oai_rx_buff_temp[0]), SAMPLES_PER_SLOT_USRP,rx_md,rx_timeout);
+	Rx_resample();
+
+	//after the first receiving, reset the timeout value
+	rx_timeout = 0.1; 
+	tmp_clock = rx_md.time_spec.to_ticks(SAM_RATE);
+
+	// Update writing position
+	w_pos_usrp_rcv = (w_pos_usrp_rcv + (int)(tmp_clock - clock_usrp))%SAMPLES_PER_FRM;
+
+	// Copy data into the PHY layer buffer
+	if((w_pos_usrp_rcv+num_rx_samps) <= SAMPLES_PER_FRM){ 
+		memcpy(& oai_rx_buff[w_pos_usrp_rcv],& oai_rx_buff_temp[0],num_rx_samps*sizeof(int));
+	}
+	else{
+		int tmp_len = SAMPLES_PER_FRM - w_pos_usrp_rcv;
+		memcpy(& oai_rx_buff[w_pos_usrp_rcv],& oai_rx_buff_temp[0],tmp_len*sizeof(int));
+		memcpy(& oai_rx_buff[0],& oai_rx_buff_temp[tmp_len],(num_rx_samps-tmp_len)*sizeof(int));
+	}
+
+	w_slot_usrp_rcv = (w_pos_usrp_rcv - hw_slot_offset + num_rx_samps - SAMPLES_PER_SLOT)%SAMPLES_PER_FRM / SAMPLES_PER_SLOT;
+
+	// update clock
+	clock_usrp = tmp_clock;
+
+	// show log
+	format_printf(g_usrp_debug,"[recv] w_pos: %d num_rx_samps=%d clock_usrp=%llu w_usrp: %d\n",w_pos_usrp_rcv,num_rx_samps,clock_usrp,w_slot_usrp_rcv);
+
+	//handle the error code
+	switch(rx_md.error_code){
+		case uhd::rx_metadata_t::ERROR_CODE_NONE:
+			break;
+		case uhd::rx_metadata_t::ERROR_CODE_OVERFLOW:
+			format_printf(g_usrp_debug,"[recv] USRP RX OVERFLOW!\n");
+			num_overflows++;
+			break;
+		case uhd::rx_metadata_t::ERROR_CODE_TIMEOUT:
+			format_printf(g_usrp_debug, "[recv] USRP RX TIMEOUT!\n");
+			break;
+		default:
+			format_printf(g_usrp_debug, "[recv] Unexpected error on RX, Error code: 0x%x\n",rx_md.error_code);    
+			break;
+	}
+}
+
+// -----------------------
+// set RX frequency in UE
+// -----------------------
+void set_freq(int freq_offset)
+{
+	rx_usrp->set_rx_freq(rx_freq + freq_offset);
+}
+
+// -----------------------
+// Rx_resample
+// -----------------------
+void Rx_resample(void)
+{
+	short Rx_data_in[6250+625*2];
+	short Rx_data_out[7680+768*2];
+	memset(Rx_data_in, 0, sizeof(Rx_data_in));
+	memset(Rx_data_out, 0, sizeof(Rx_data_out));
+
+	memcpy(Rx_data_in, Rx_history, 625*4);
+	memcpy(Rx_data_in+625*2, & oai_rx_buff_temp[0], 3125*4);
+
+	polyphaseResample(Rx_data_in, sizeof(Rx_data_in) / sizeof(short) / 2 ,Rx_data_out , sizeof(Rx_data_out) / sizeof(short) / 2 , coeff_25_to_3072, sizeof(coeff_25_to_3072) / sizeof(short), INRATE, OUTRATE, 13, g_branch_table, g_offset_table);
+	memcpy(& oai_rx_buff_temp[0], Rx_data_out+768*2, 3840*4);
+	memcpy(Rx_history, Rx_data_in+6250-625*2, 625*4);
+}
+
+// -----------------------
+// Tx_resample
+// -----------------------
+void Tx_resample(void)
+{
+	short Tx_data_out[6250+625*2];
+	short Tx_data_in[7680+768*2];
+	memset(Tx_data_in, 0, sizeof(Tx_data_in));
+	memset(Tx_data_out, 0, sizeof(Tx_data_out));
+
+	memcpy(Tx_data_in, Tx_history, 768*4);
+	memcpy(Tx_data_in+768*2, & oai_tx_buff_temp[0], 3840*4);
+
+	polyphaseResample(Tx_data_in, sizeof(Tx_data_in) / sizeof(short) / 2 ,Tx_data_out , sizeof(Tx_data_out) / sizeof(short) / 2 , coeff_3072_to_25, sizeof(coeff_3072_to_25) / sizeof(short) , OUTRATE, INRATE, 11, g_branch_table, g_offset_table);
+	memcpy((& oai_tx_buff_temp[0]) , Tx_data_out+625*2, 3125*4);
+	memcpy(Tx_history, Tx_data_in+7680-768*2, 768*4);
+}

targets/ARCH/USRP/USERSPACE/LIB/polyphaseResample.cpp

+#include "polyphaseResample.h"
+#include <iostream>
+#include <stdio.h>
+using namespace std;
+
+// table_len should be decied by the length of the filter output
+// but a default value of 50000 is adequate for our app
+void buildPolyphaseCache(const int P, const int Q, int *&branch_table, int *&offset_table, const int table_len) {
+	branch_table = new int[table_len];
+	offset_table = new int[table_len];
+	for (int i = 0; i < table_len; ++i) {
+		branch_table[i] = (i * Q) % P;
+		offset_table[i] = (i * Q - branch_table[i]) / P;
+	}
+}
+
+void polyphaseResample(short *in_data, unsigned int in_sample_count,
+		short *out_data, unsigned int out_sample_count,
+		short *filter_coeff, unsigned int filter_len,
+		const int P, const int Q, const unsigned int fix_shift,
+		int *branch_table, int *offset_table) {
+	buildPolyphaseCache( P, Q, branch_table, offset_table, 50000);
+	// calculate the sample count of output
+	out_sample_count = (int)(in_sample_count * (float)P / (float)Q);
+
+	short *output_ptr = out_data;
+	unsigned int output_ix = 0;
+	short const *input_end = in_data + in_sample_count * 2;
+	short const *output_end = out_data + out_sample_count * 2;
+	short const *filter_end = filter_coeff + filter_len;
+	while (output_ptr < output_end) 
+	{
+		int output_branch = branch_table[output_ix];
+		int input_offset = offset_table[output_ix];
+
+		short *input_ptr = in_data + 2 * input_offset;
+		short *filter_ptr = filter_coeff + output_branch;
+
+		while (input_ptr >= input_end) {
+			input_ptr -= 2;
+			filter_ptr += P;
+		}
+
+		int sum_real = 0, sum_imag = 0;
+		while ((input_ptr >= in_data) && (filter_ptr < filter_end)) {
+			sum_real += (int)(*input_ptr) * (int)(*filter_ptr);
+			sum_imag += (int)(*(input_ptr + 1)) * (int)(*filter_ptr);
+			input_ptr -= 2;
+			filter_ptr += P;
+		}
+
+		*output_ptr = (short)(sum_real >> fix_shift);
+		*(output_ptr + 1) = (short)(sum_imag >> fix_shift);
+
+		output_ptr += 2;
+		output_ix++;
+	}
+}
+
+
+

targets/ARCH/USRP/USERSPACE/LIB/polyphaseResample.h

+#ifndef _POLYPHASERESAMPLE_H_
+#include <cmath>
+//#include "coeff_3072_to_25.h"
+
+void buildPolyphaseCache(const int P, const int Q, int *&branch_table, int *&offset_table, const int filter_len = 50000);
+
+
+/**
+ * @brief polyphase resampler
+ * @param in_data input data, layout as [real,imag,real,imag...]
+ * @param in_sample_count count of input samples, i.e. a complex 
+ *        cosisting of two short int counts as one
+ * @param out_data output data, layout same as in_data
+ * @param out_sample_count sample count of result, as return
+ * @param filter_coeff filter with only real coeffcients
+ * @param filter_len count of coeffcients
+ * @param P order of upper sampling
+ * @param Q order of down sampling
+ **/
+
+void polyphaseResample(short *in_data, unsigned int in_sample_count,
+    short *out_data, unsigned int out_sample_count,
+    short *filter_coeff, unsigned int filter_len,
+    const int P, const int Q, const unsigned int fix_shift,
+    int *branch_table, int *offset_table);
+#endif
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