kopia lustrzana https://github.com/OpenRTX/OpenRTX
57 wiersze
1.8 KiB
C++
57 wiersze
1.8 KiB
C++
/*******************************************************************************
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* *
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* Convert a baseband from m17-cpp-mod to Module17/MD3x0 ADC input equivalent *
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* *
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******************************************************************************/
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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int main(int argc, char *argv[]) {
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FILE *baseband_in = fopen(argv[1], "rb");
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if (!baseband_in)
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{
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perror("Error in reading test baseband");
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return -1;
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}
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// Get file size
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fseek(baseband_in, 0L, SEEK_END);
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long baseband_size = ftell(baseband_in);
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unsigned baseband_samples = baseband_size / 2;
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fseek(baseband_in, 0L, SEEK_SET);
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printf("Baseband is %ld bytes!\n", baseband_size);
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// Read data from input file
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int16_t *baseband_buffer = (int16_t *) malloc(baseband_size);
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if (!baseband_buffer)
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{
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perror("Error in memory allocation");
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return -1;
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}
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size_t read_items = fread(baseband_buffer, 2, baseband_samples, baseband_in);
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if (read_items != baseband_samples)
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{
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perror("Error in reading input file");
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return -1;
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}
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fclose(baseband_in);
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// Add DC bias
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int16_t *filtered_buffer = (int16_t *) malloc(baseband_size);
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for(size_t i = 0; i < baseband_samples; i++)
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{
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float elem = static_cast< float >(baseband_buffer[i]);
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filtered_buffer[i] = static_cast< int16_t >((elem + 32768) / 16);
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printf("%d\n", filtered_buffer[i]);
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}
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// Write back
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FILE *baseband_out = fopen(argv[2], "wb");
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fwrite(filtered_buffer, baseband_samples, 2, baseband_out);
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fclose(baseband_out);
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}
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