From: "Lu, Han" <han.lu@xxxxxxxxx>
Add function generate_sine_wave_raw_mono(). It serves as a single
channel sine wave generator, to provide data for calculation (e.g.
for noise analysis).
The function is similar to generate_sine_wave(), but a lite revision.
It has no dependency on bat channels and target frequency, no malloc
inside, no data conversion from float to integer samples, and supports
one channel only.
Signed-off-by: Lu, Han <han.lu@xxxxxxxxx>
diff --git a/bat/bat-signal.h b/bat/bat-signal.h
index a295517..3c314a5 100644
--- a/bat/bat-signal.h
+++ b/bat/bat-signal.h
@@ -28,3 +28,4 @@ int sin_generator_init(struct sin_generator *, float, float, float);
float sin_generator_next_sample(struct sin_generator *);
void sin_generator_vfill(struct sin_generator *, float *, int);
int generate_sine_wave(struct bat *, int, void *);
+int generate_sine_wave_raw_mono(struct bat *, float *, float, int);
diff --git a/bat/signal.c b/bat/signal.c
index 2047f53..c9b5c7b 100644
--- a/bat/signal.c
+++ b/bat/signal.c
@@ -183,3 +183,21 @@ exit:
return err;
}
+
+/* generate single channel sine waveform without sample conversion */
+int generate_sine_wave_raw_mono(struct bat *bat, float *buf,
+ float freq, int nsamples)
+{
+ int err = 0;
+ struct sin_generator sg;
+
+ err = sin_generator_init(&sg, 1.0, freq, bat->rate);
+ if (err < 0)
+ return err;
+ sin_generator_vfill(&sg, buf, nsamples);
+
+ /* adjust amplitude and offset of waveform */
+ err = adjust_waveform(bat, buf, nsamples, 1);
+
+ return err;
+}
--
2.5.0
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