xref: /btstack/src/btstack_audio.h (revision 23a1bbc334545ae8d516834e2b13961ba2038f4a)

/*
 * 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
 * [email protected]
 *
 */

#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