ext: add libsamplerate library

Adds libsamplerate library that allows to resample audio streams to
different samplerate.

ext/libsamplerate/include/config.h

@@ -0,0 +1,44 @@
+/*
+ * 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.
+ */
+
+#ifndef H_LIBSAMPLERATE_CONFIG_
+#define H_LIBSAMPLERATE_CONFIG_
+
+#include "syscfg/syscfg.h"
+
+#if MYNEWT_VAL(ENABLE_SINC_BEST_CONVERTER)
+#define ENABLE_SINC_BEST_CONVERTER      1
+#endif
+
+#if MYNEWT_VAL(ENABLE_SINC_MEDIUM_CONVERTER)
+#define ENABLE_SINC_MEDIUM_CONVERTER      1
+#endif
+
+#if MYNEWT_VAL(ENABLE_SINC_FAST_CONVERTER)
+#define ENABLE_SINC_FAST_CONVERTER      1
+#endif
+
+#if MYNEWT_VAL(LIBSAMPLER_NDEBUG)
+#define LIBSAMPLER_NDEBUG      1
+#endif
+
+#define PACKAGE     "libsamplerate"
+#define VERSION     "0.2.2"
+
+#endif /* H_LIBSAMPLERATE_CONFIG_ */

ext/libsamplerate/pkg.yml

@@ -0,0 +1,57 @@
+#
+# 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.
+#
+
+pkg.name: ext/libsamplerate
+pkg.description: samplerate library
+pkg.author: "Apache Mynewt <dev@mynewt.apache.org>"
+pkg.homepage: "http://mynewt.apache.org/"
+pkg.keywords:
+    - samplerate
+
+pkg.type: sdk
+
+pkg.cflags: -DHAVE_STDBOOL_H -fsingle-precision-constant -DHAVE_CONFIG_H
+pkg.cflags.ENABLE_SINC_BEST_CONVERTER: -DENABLE_SINC_BEST_CONVERTER
+pkg.cflags.ENABLE_SINC_MEDIUM_CONVERTER: -DENABLE_SINC_MEDIUM_CONVERTER
+pkg.cflags.ENABLE_SINC_FAST_CONVERTER: -DENABLE_SINC_FAST_CONVERTER
+pkg.cflags.LIBSAMPLER_NDEBUG: -DNDEBUG
+pkg.lflags: -lm
+
+pkg.ign_dirs:
+    - "@libsamplerate/Octave"
+    - "@libsamplerate/Win32"
+    - "@libsamplerate/cmake"
+    - "@libsamplerate/docs"
+    - "@libsamplerate/examples"
+    - "@libsamplerate/include"
+    - "@libsamplerate/m4"
+    - "@libsamplerate/tests"
+
+pkg.src_dirs:
+    - "@libsamplerate/src"
+
+pkg.include_dirs:
+    - "@libsamplerate/include"
+
+repository.libsamplerate:
+    type: github
+    vers: 0.2.2-commit
+    branch: release-0.2.2
+    user: libsndfile
+    repo: libsamplerate

ext/libsamplerate/syscfg.yml

@@ -0,0 +1,30 @@
+# 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.
+
+syscfg.defs:
+    ENABLE_SINC_BEST_CONVERTER:
+        description: Enable SINC best converter
+        value: 1
+    ENABLE_SINC_MEDIUM_CONVERTER:
+        description: Enable SINC medium converter
+        value: 1
+    ENABLE_SINC_FAST_CONVERTER:
+        description: Enable SINC fastest converter
+        value: 1
+    LIBSAMPLER_NDEBUG:
+        description: Define NDEBUG for resampler code (turns off asserts)
+        value: 0