Introduce btstack_audio.h api

src/Makefile.inc

@@ -17,6 +17,7 @@ SRC_FILES = \
     hci_transport_em9304_spi.c \
     hci.c \
     btstack_slip.c \
+    btstack_audio.c \
     hci_transport_h5.c \
     btstack_tlv.c \
     btstack_crypto.c \

src/btstack_audio.c

@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2017 BlueKitchen GmbH
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holders nor the names of
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ * 4. Any redistribution, use, or modification is done solely for
+ *    personal benefit and not for any commercial purpose or for
+ *    monetary gain.
+ *
+ * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS
+ * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+ * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * Please inquire about commercial licensing options at
+ * contact@bluekitchen-gmbh.com
+ *
+ */
+
+#include "btstack_audio.h"
+
+/*
+ *  btstack_audio.c
+ *
+ */
+
+static const btstack_audio_t * btstack_audio_instance;
+
+/**
+ * @brief Get BTstack Audio Instance
+ * @returns btstack_audio implementation
+ */
+const btstack_audio_t * btstack_audio_get_instance(void){
+	return btstack_audio_instance;
+}
+
+/**
+ * @brief Get BTstack Audio Instance
+ * @param btstack_audio implementation
+ */
+void btstack_audio_set_instance(const btstack_audio_t * audio_impl){
+	btstack_audio_instance = audio_impl;
+}

src/btstack_audio.h

@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2017 BlueKitchen GmbH
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holders nor the names of
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ * 4. Any redistribution, use, or modification is done solely for
+ *    personal benefit and not for any commercial purpose or for
+ *    monetary gain.
+ *
+ * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS
+ * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+ * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * Please inquire about commercial licensing options at
+ * contact@bluekitchen-gmbh.com
+ *
+ */
+
+#ifndef __BTSTACK_AUDIO_DMA_H
+#define __BTSTACK_AUDIO_DMA_H
+
+#include <stdint.h>
+
+#if defined __cplusplus
+extern "C" {
+#endif
+
+/*
+ *  btstack_audio.h
+ *
+ *  Abstraction layer for 16-bit audio playback and recording within BTstack
+ */
+
+typedef struct {
+
+	/**
+	 * @brief Setup audio codec for specified samplerate and number of channels
+	 * @param Channels (1=mono, 2=stereo)
+	 * @param Sample rate
+	 * @param Playback callback
+	 * @param Recording callback
+	 * @return 1 on success
+	 */
+	int (*init)(uint8_t channels,
+				uint32_t samplerate, 
+				void (*playback) (      int16_t * buffer, uint16_t num_samples),
+				void (*recording)(const int16_t * buffer, uint16_t num_samples));
+
+	/** 
+	 * @brief Start stream
+	 */
+	void (*start_stream)(void);
+
+	/**
+	 * @brief Close audio codec
+	 */
+	void (*close)(void);
+
+} btstack_audio_t;
+
+/**
+ * @brief Get BTstack Audio Instance
+ * @returns btstack_audio implementation
+ */
+const btstack_audio_t * btstack_audio_get_instance(void);
+
+/**
+ * @brief Get BTstack Audio Instance
+ * @param btstack_audio implementation
+ */
+void btstack_audio_set_instance(const btstack_audio_t * audio_impl);
+
+
+// common implementations
+const btstack_audio_t * btstack_audio_portaudio_get_instance(void);
+const btstack_audio_t * btstack_audio_embedded_get_instance(void);
+
+#if defined __cplusplus
+}
+#endif
+
+#endif