commit
12e58d5440
2 changed files with 39 additions and 14 deletions
|
@ -20,6 +20,10 @@
|
||||||
|
|
||||||
#include <string>
|
#include <string>
|
||||||
|
|
||||||
|
#if defined(DUMP_RF_AUDIO)
|
||||||
|
#include <stdio.h>
|
||||||
|
#endif
|
||||||
|
|
||||||
const float EMPHASIS_GAIN_DB = 0.0F; //Gain needs to be the same for pre an deeemphasis
|
const float EMPHASIS_GAIN_DB = 0.0F; //Gain needs to be the same for pre an deeemphasis
|
||||||
const unsigned int FM_MASK = 0x00000FFFU;
|
const unsigned int FM_MASK = 0x00000FFFU;
|
||||||
|
|
||||||
|
@ -41,6 +45,9 @@ bool CFMControl::writeModem(const unsigned char* data, unsigned int length)
|
||||||
assert(data != NULL);
|
assert(data != NULL);
|
||||||
assert(length > 0U);
|
assert(length > 0U);
|
||||||
|
|
||||||
|
if (m_network == NULL)
|
||||||
|
return true;
|
||||||
|
|
||||||
if (data[0U] == TAG_HEADER)
|
if (data[0U] == TAG_HEADER)
|
||||||
return true;
|
return true;
|
||||||
|
|
||||||
|
@ -50,8 +57,6 @@ bool CFMControl::writeModem(const unsigned char* data, unsigned int length)
|
||||||
if (data[0U] != TAG_DATA)
|
if (data[0U] != TAG_DATA)
|
||||||
return false;
|
return false;
|
||||||
|
|
||||||
if (m_network == NULL)
|
|
||||||
return true;
|
|
||||||
|
|
||||||
m_incomingRFAudio.addData(data + 1U, length - 1U);
|
m_incomingRFAudio.addData(data + 1U, length - 1U);
|
||||||
unsigned int bufferLength = m_incomingRFAudio.dataSize();
|
unsigned int bufferLength = m_incomingRFAudio.dataSize();
|
||||||
|
@ -59,6 +64,10 @@ bool CFMControl::writeModem(const unsigned char* data, unsigned int length)
|
||||||
bufferLength = 255U;
|
bufferLength = 255U;
|
||||||
|
|
||||||
if (bufferLength >= 3U) {
|
if (bufferLength >= 3U) {
|
||||||
|
#if defined(DUMP_RF_AUDIO)
|
||||||
|
FILE * audiofile = fopen("./audiodump.bin", "ab");
|
||||||
|
#endif
|
||||||
|
|
||||||
bufferLength = bufferLength - bufferLength % 3U; //round down to nearest multiple of 3
|
bufferLength = bufferLength - bufferLength % 3U; //round down to nearest multiple of 3
|
||||||
unsigned char bufferData[255U];
|
unsigned char bufferData[255U];
|
||||||
m_incomingRFAudio.getData(bufferData, bufferLength);
|
m_incomingRFAudio.getData(bufferData, bufferLength);
|
||||||
|
@ -68,28 +77,34 @@ bool CFMControl::writeModem(const unsigned char* data, unsigned int length)
|
||||||
|
|
||||||
// Unpack the serial data into float values.
|
// Unpack the serial data into float values.
|
||||||
for (unsigned int i = 0U; i < bufferLength; i += 3U) {
|
for (unsigned int i = 0U; i < bufferLength; i += 3U) {
|
||||||
unsigned short sample1 = 0U;
|
short sample1 = 0U;
|
||||||
unsigned short sample2 = 0U;
|
short sample2 = 0U;
|
||||||
|
|
||||||
unsigned int pack = 0U;
|
unsigned int pack = 0U;
|
||||||
unsigned char* packPointer = (unsigned char*)&pack;
|
unsigned char* packPointer = (unsigned char*)&pack;
|
||||||
|
|
||||||
packPointer[1U] = bufferData[i];
|
packPointer[0U] = bufferData[i];
|
||||||
packPointer[2U] = bufferData[i + 1U];
|
packPointer[1U] = bufferData[i + 1U];
|
||||||
packPointer[3U] = bufferData[i + 2U];
|
packPointer[2U] = bufferData[i + 2U];
|
||||||
|
|
||||||
sample2 = short(pack & FM_MASK);
|
//extract unsigned 12 bit samples to 16 bit signed
|
||||||
sample1 = short(pack >> 12);
|
sample2 = short(int(pack & FM_MASK) - 2048);
|
||||||
|
sample1 = short(int(pack >> 12) - 2048);
|
||||||
|
|
||||||
// Convert from unsigned short (0 - +4095) to float (-1.0 - +1.0)
|
// Convert from unsigned short (0 - +4095) to float (-1.0 - +1.0)
|
||||||
samples[nSamples++] = (float(sample1) - 2048.0F) / 2048.0F;
|
samples[nSamples++] = float(sample1) / 2048.0F;
|
||||||
samples[nSamples++] = (float(sample2) - 2048.0F) / 2048.0F;
|
samples[nSamples++] = float(sample2) / 2048.0F;
|
||||||
}
|
}
|
||||||
|
|
||||||
//De-emphasise the data and any other processing needed (maybe a low-pass filter to remove the CTCSS)
|
//De-emphasise the data and any other processing needed (maybe a low-pass filter to remove the CTCSS)
|
||||||
for (unsigned int i = 0U; i < nSamples; i++)
|
for (unsigned int i = 0U; i < nSamples; i++)
|
||||||
samples[i] = m_deemphasis.filter(samples[i]);
|
samples[i] = m_deemphasis.filter(samples[i]);
|
||||||
|
|
||||||
|
#if defined(DUMP_RF_AUDIO)
|
||||||
|
if(audiofile != NULL)
|
||||||
|
fwrite(samples, sizeof(float), nSamples, audiofile);
|
||||||
|
#endif
|
||||||
|
|
||||||
unsigned short out[170U]; // 85 * 2
|
unsigned short out[170U]; // 85 * 2
|
||||||
unsigned int nOut = 0U;
|
unsigned int nOut = 0U;
|
||||||
|
|
||||||
|
@ -100,6 +115,11 @@ bool CFMControl::writeModem(const unsigned char* data, unsigned int length)
|
||||||
out[nOut++] = (sample >> 0) & 0xFFU;
|
out[nOut++] = (sample >> 0) & 0xFFU;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
#if defined(DUMP_RF_AUDIO)
|
||||||
|
if(audiofile != NULL)
|
||||||
|
fclose(audiofile);
|
||||||
|
#endif
|
||||||
|
|
||||||
return m_network->writeData((unsigned char*)out, nOut);
|
return m_network->writeData((unsigned char*)out, nOut);
|
||||||
}
|
}
|
||||||
|
|
||||||
|
@ -147,9 +167,9 @@ unsigned int CFMControl::readModem(unsigned char* data, unsigned int space)
|
||||||
pack = ((unsigned int)sample1) << 12;
|
pack = ((unsigned int)sample1) << 12;
|
||||||
pack |= sample2;
|
pack |= sample2;
|
||||||
|
|
||||||
data[j] = packPointer[1U];
|
data[j] = packPointer[0U];
|
||||||
data[j + 1U] = packPointer[2U];
|
data[j + 1U] = packPointer[1U];
|
||||||
data[j + 2U] = packPointer[3U];
|
data[j + 2U] = packPointer[2U];
|
||||||
}
|
}
|
||||||
|
|
||||||
return j;//return the number of bytes written
|
return j;//return the number of bytes written
|
||||||
|
|
|
@ -23,6 +23,11 @@
|
||||||
#include "Defines.h"
|
#include "Defines.h"
|
||||||
#include "IIRDirectForm1Filter.h"
|
#include "IIRDirectForm1Filter.h"
|
||||||
|
|
||||||
|
// Uncomment this to dump audio to a raw audio file
|
||||||
|
// The file will be written in same folder as executable
|
||||||
|
// Toplay the file : aplay -f FLOAT_LE -c1 -r8000 -t raw audiodump.bin
|
||||||
|
//#define DUMP_RF_AUDIO
|
||||||
|
|
||||||
class CFMControl {
|
class CFMControl {
|
||||||
public:
|
public:
|
||||||
CFMControl(CFMNetwork* network);
|
CFMControl(CFMNetwork* network);
|
||||||
|
|
Loading…
Reference in a new issue