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Increase the number of useful bits in the spectrum.

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Change-Id: I3efc2ac8db689285566df35cb6f594aab41141db
This commit is contained in:
Marco Nelissen
2011-01-18 16:44:28 -08:00
parent c896d85c15
commit dbc0fe985f
1 changed files with 7 additions and 2 deletions
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9
media/libmedia/Visualizer.cpp
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@@ -219,8 +219,13 @@ status_t Visualizer::doFft(uint8_t *fft, uint8_t *waveform)
}
for (uint32_t i = 0; i < mCaptureSize; i += 2) {
fft[i] = workspace[i >> 1] >> 24;
fft[i + 1] = workspace[i >> 1] >> 8;
short tmp = workspace[i >> 1] >> 21;
while (tmp > 127 || tmp < -128) tmp >>= 1;
fft[i] = tmp;
tmp = workspace[i >> 1];
tmp >>= 5;
while (tmp > 127 || tmp < -128) tmp >>= 1;
fft[i + 1] = tmp;
}
return NO_ERROR;