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45 lines
1.1 KiB
Text
45 lines
1.1 KiB
Text
{
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guint j;
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double squaresum = 0.0;
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double RMS = 0.0;
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double RMS_dB = 0.0;
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static int threshold_dB = -80;
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static long int sample = 0;
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double timepoint;
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/*
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* process data here
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* input sample data enters in *in_data as 8 or 16 bit data
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* samples for left and right channel are interleaved
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*/
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/*
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for(j = 0; j < num_samples; j++) {
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(*out_data)[j] = in_data[j];
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squaresum += in_data[j] * in_data[j];
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}
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RMS = sqrt (squaresum / (float) num_samples);
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printf ("RMS for this block : %f\n", RMS);
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RMS_dB = 20 * log (RMS / 32767);
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printf ("RMS in dB (for 16bit) : %f\n", RMS_dB);
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*/
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for(j = 0; j < num_samples; j++) {
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(*out_data)[j] = in_data[j];
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squaresum += pow ((double) in_data[j] / 32767.0, 2);
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}
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RMS = sqrt (squaresum / (float) num_samples);
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RMS_dB = 10 * log (RMS);
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sample += num_samples;
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timepoint = sample / (44100.0 * 2);
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if (RMS_dB > (double) threshold_dB)
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{
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/* printf ("Reached %d dB at %f sec (%f dB)\n",
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threshold_dB, timepoint, RMS_dB);
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*/
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threshold_dB += 1;
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}
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/* printf ("RMS in dB (for 16bit) : %f\n", RMS_dB); */
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printf ("%f s %f dB\n", timepoint, RMS_dB);
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}
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