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/*
* This file is subject to the terms of the GFX License. If a copy of
* the license was not distributed with this file, you can obtain one at:
*
* http://ugfx.org/license.html
*/
/**
* @file src/gaudout/driver.h
* @brief GAUDOUT - Audio Output driver header file.
*
* @defgroup Driver Driver
* @ingroup GAUDOUT
* @{
*/
#ifndef _GAUDOUT_LLD_H
#define _GAUDOUT_LLD_H
#include "gfx.h"
#if GFX_USE_GAUDOUT || defined(__DOXYGEN__)
/*===========================================================================*/
/* Type definitions */
/*===========================================================================*/
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Get a block of audio data to play
* @return A pointer to the GAaudioData structure or NULL if none is currently available
*
* @note Defined in the high level GAUDOUT code for use by the GAUDOUT drivers.
*
* @iclass
* @notapi
*/
GAudioData *gaudoutGetDataBlockI(void);
/**
* @brief Release a block of audio data after playing
*
* @param[in] paud The GAudioData block to be released.
*
* @note Defined in the high level GAUDOUT code for use by the GAUDOUT drivers.
*
* @iclass
* @notapi
*/
void gaudoutReleaseDataBlockI(GAudioData *paud);
/**
* @brief Initialise the driver
* @return TRUE if the channel and frequency are valid.
*
* @param[in] channel The channel to use (see the driver for the available channels provided)
* @param[in] frequency The sample frequency to use
* @param[in] format The sample format
*
* @note The driver will always have been stopped and de-init before this is called.
*
* @api
*/
bool_t gaudout_lld_init(uint16_t channel, uint32_t frequency, ArrayDataFormat format);
/**
* @brief De-Initialise the driver
*
* @note The audio output will always have been stopped first by the high level layer.
* @note This may be called before a @p gaudout_lld_init() has occurred.
*
* @api
*/
void gaudout_lld_deinit(void);
/**
* @brief Start the audio output playing
*
* @note This may be called at any stage including while the driver
* is already playing. The driver should check for data blocks
* to play using @p gaudoutGetDataBlockI().
*
* @api
*/
void gaudout_lld_start(void);
/**
* @brief Stop the audio output playing.
*
* @note Some drivers may only stop playing at a data block boundary.
* @note This may be called before a @p gaudout_lld_init() has occurred.
*
* @api
*/
void gaudout_lld_stop(void);
/**
* @brief Set the output volume.
* @return TRUE if successful.
*
* @param[in] 0->255 (0 = muted)
*
* @note Some drivers may not support this. They will return FALSE.
* @note For stereo devices, both channels are set to the same volume.
*
* @api
*/
bool_t gaudout_lld_set_volume(uint8_t vol);
#ifdef __cplusplus
}
#endif
#endif /* GFX_USE_GAUDOUT */
#endif /* _GAUDOUT_LLD_H */
/** @} */
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