Add vela alsa lib interface

audioutils/alsa-lib/CMakeLists.txt

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+# ##############################################################################
+# apps/audioutils/alsa-lib/CMakeLists.txt
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more contributor
+# license agreements.  See the NOTICE file distributed with this work for
+# additional information regarding copyright ownership.  The ASF licenses this
+# file to you under the Apache License, Version 2.0 (the "License"); you may not
+# use this file except in compliance with the License.  You may obtain a copy of
+# the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations under
+# the License.
+#
+# ##############################################################################
+
+if(CONFIG_AUDIOUTILS_ALSA_LIB)
+  target_sources(apps PRIVATE alsa_pcm.c alsa_error.c)
+endif()

audioutils/alsa-lib/Kconfig

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+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+config AUDIOUTILS_ALSA_LIB
+	tristate "Enable ALSA lib"
+	default n
+
+if AUDIOUTILS_ALSA_LIB
+
+config AUDIOUTILS_ALSA_LIB_DEV_PATH
+	string "play/recored device path"
+	default "/dev/audio"
+
+endif # ALSA_LIB

audioutils/alsa-lib/Make.defs

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+############################################################################
+# apps/audioutils/alsa-lib/Make.defs
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+ifneq ($(CONFIG_AUDIOUTILS_ALSA_LIB),)
+
+CONFIGURED_APPS += $(APPDIR)/audioutils/alsa-lib
+
+CFLAGS += ${INCDIR_PREFIX}$(APPDIR)/audioutils/alsa-lib/include
+CXXFLAGS += ${INCDIR_PREFIX}$(APPDIR)/audioutils/alsa-lib/include
+
+endif

audioutils/alsa-lib/Makefile

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+############################################################################
+# apps/audioutils/alsa-lib/Makefile
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+include $(APPDIR)/Make.defs
+
+CSRCS += $(wildcard *.c)
+
+EXPORT_FILES := include
+
+include $(APPDIR)/Application.mk

audioutils/alsa-lib/alsa_error.c

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+/****************************************************************************
+ * apps/audioutils/alsa-lib/alsa_error.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <alsa_error.h>
+
+#include <string.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+FAR const char *snd_strerror(int errnum)
+{
+  if (errnum < 0)
+    {
+      errnum = -errnum;
+    }
+
+  return (FAR const char *)strerror(errnum);
+}