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Replaces a use of log2.

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I've replaced a log2 operation so it works on Windows.
Review URL: http://webrtc-codereview.appspot.com/171002

git-svn-id: http://webrtc.googlecode.com/svn/trunk@637 4adac7df-926f-26a2-2b94-8c16560cd09d
This commit is contained in:
bjornv@google.com 2011-09-23 08:13:53 +00:00
parent 90eff6c7c6
commit dc743a8bba
1 changed files with 10 additions and 11 deletions
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21
src/modules/audio_processing/utility/delay_estimator_float.c
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@ -170,11 +170,12 @@ int WebRtc_DelayEstimatorProcessFloat(void* handle,
DelayEstimatorFloat_t* self = (DelayEstimatorFloat_t*) handle;
const float kFftSize = (float) (2 * (spectrum_size - 1));
const float kLogOf2Inverse = 1.4426950f;
float max_value = 0.0f;
float freq_scaling = 0;
float scaling = 0;
int far_q = 0;
int freq_scaling_log = 0;
int scaling_log = 0;
int i = 0;
if (self == NULL) {
@ -206,11 +207,10 @@ int WebRtc_DelayEstimatorProcessFloat(void* handle,
// TODO(bjornv): I've taken the size of FFT into account, since there is a
// different scaling in float vs fixed point FFTs. I'm not completely sure
// this is necessary.
// TODO(bjornv): Replace log2()
freq_scaling_log = 0;//14; - (int) log2(max_value / kFftSize + 1);
freq_scaling = (float) (1 << freq_scaling_log) / kFftSize;
scaling_log = 14 - (int) (log(max_value / kFftSize + 1) * kLogOf2Inverse);
scaling = (float) (1 << scaling_log) / kFftSize;
for (i = 0; i < spectrum_size; ++i) {
self->near_spectrum_u16[i] = (uint16_t) (near_spectrum[i] * freq_scaling);
self->near_spectrum_u16[i] = (uint16_t) (near_spectrum[i] * scaling);
}
// Same for far end
@ -222,13 +222,12 @@ int WebRtc_DelayEstimatorProcessFloat(void* handle,
}
// Find the largest possible scaling that is a multiple of two.
// With largest we mean to fit in a Word16.
// TODO(bjornv): Replace log2()
freq_scaling_log = 0;//14 - (int) log2(max_value / kFftSize + 1);
freq_scaling = (float) (1 << freq_scaling_log) / kFftSize;
scaling_log = 14 - (int) (log(max_value / kFftSize + 1) * kLogOf2Inverse);
scaling = (float) (1 << scaling_log) / kFftSize;
for (i = 0; i < spectrum_size; ++i) {
self->far_spectrum_u16[i] = (uint16_t) (far_spectrum[i] * freq_scaling);
self->far_spectrum_u16[i] = (uint16_t) (far_spectrum[i] * scaling);
}
far_q = (int) freq_scaling_log;
far_q = (int) scaling_log;
assert(far_q < 16); // Catch too large scaling, which should never be able to
// occur.