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