audio_codec: integrate speech-micro

Leverage speech-micro to detect hotword.

BRANCH=none
BUG=b:122027734, b:123268236, b:132319180
TEST=1. define CONFIG_AUDIO_CODEC in board.h
2. define CONFIG_AUDIO_CODEC_DMIC in board.h
3. define CONFIG_AUDIO_CODEC_DMIC_SOFTWARE_GAIN in board.h
4. define CONFIG_AUDIO_CODEC_DMIC_MAX_SOFTWARE_GAIN in board.h
5. define CONFIG_AUDIO_CODEC_WOV in board.h
6. make BOARD=kukui_scp -j

Change-Id: I8b238fd8bd9af8e70d5a747650eb8b7dbf4200cb
Signed-off-by: Tzung-Bi Shih <tzungbi@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1602453
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>

1 files changed, 35 insertions, 0 deletions

diff --git a/common/hotword_dsp_api.c b/common/hotword_dsp_api.c
new file mode 100644
index 0000000000..dc53cd0055
--- /dev/null
+++ b/common/hotword_dsp_api.c
@@ -0,0 +1,35 @@
+/*
+ * Copyright 2019 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 "audio_codec.h"
+#include "hotword_dsp_api.h"
+
+const int kGoogleHotwordRequiredDataAlignment = 4;
+
+int GoogleHotwordDspInit(void *hotword_memmap)
+{
+	return 1;
+}
+
+int GoogleHotwordDspProcess(const void *samples, int num_samples,
+			    int *preamble_length_ms)
+{
+	return 0;
+}
+
+void GoogleHotwordDspReset(void)
+{
+}
+
+int GoogleHotwordDspGetMaximumAudioPreambleMs(void)
+{
+	return 0;
+}
+
+int GoogleHotwordVersion(void)
+{
+	return 0;
+}