1 files changed, 0 insertions, 68 deletions
diff --git a/cras/src/dsp/dcblock.c b/cras/src/dsp/dcblock.c
deleted file mode 100644
index 53ba9412..00000000
--- a/cras/src/dsp/dcblock.c
+++ /dev/null
@@ -1,68 +0,0 @@
-/* Copyright 2017 The Chromium OS Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include <stdlib.h>
-#include "dcblock.h"
-
-#define RAMP_TIME_MS 20
-
-struct dcblock {
-	float R;
-	float x_prev;
-	float y_prev;
-	float ramp_factor;
-	float ramp_increment;
-	int initialized;
-};
-
-struct dcblock *dcblock_new(float R, unsigned long sample_rate)
-{
-	struct dcblock *dcblock = (struct dcblock *)calloc(1, sizeof(*dcblock));
-	dcblock->R = R;
-	dcblock->ramp_increment = 1000. / (float)(RAMP_TIME_MS * sample_rate);
-	return dcblock;
-}
-
-void dcblock_free(struct dcblock *dcblock)
-{
-	free(dcblock);
-}
-
-/* This is the prototype of the processing loop. */
-void dcblock_process(struct dcblock *dcblock, float *data, int count)
-{
-	int n;
-	float x_prev = dcblock->x_prev;
-	float y_prev = dcblock->y_prev;
-	float R = dcblock->R;
-
-	if (!dcblock->initialized) {
-		x_prev = data[0];
-		dcblock->initialized = 1;
-	}
-
-	for (n = 0; n < count; n++) {
-		float x = data[n];
-		float d = x - x_prev + R * y_prev;
-
-		y_prev = d;
-		x_prev = x;
-
-		/*
-		 * It takes a while for this DC-block filter to completely
-		 * filter out a large DC-offset, so apply a mix-in ramp to
-		 * avoid any residual jump discontinuities that can lead to
-		 * "pop" during capture.
-		 */
-		if (dcblock->ramp_factor < 1.0) {
-			d *= dcblock->ramp_factor;
-			dcblock->ramp_factor += dcblock->ramp_increment;
-		}
-
-		data[n] = d;
-	}
-	dcblock->x_prev = x_prev;
-	dcblock->y_prev = y_prev;
-}