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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/gaudio/gaudio_driver_play.h
* @brief GAUDIO - Audio play driver header file.
*
* @defgroup GAUDIO_Driver_Playback Driver Playback
* @ingroup GAUDIO
*
* @brief Playback driver interface for the GAUDIO module.
*
* @{
*/
#ifndef _GAUDIO_PLAY_LLD_H
#define _GAUDIO_PLAY_LLD_H
#include "../../gfx.h"
#if (GFX_USE_GAUDIO && GAUDIO_NEED_PLAY) || 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 GAUDIO code for use by the GAUDIO play drivers.
*
* @iclass
* @notapi
*/
GDataBuffer *gaudioPlayGetDataBlockI(void);
/**
* @brief Release a block of audio data to the free list
*
* @param[in] paud The GDataBuffer block to be released.
*
* @note Defined in the high level GAUDIO code for use by the GAUDIO play drivers.
*
* @iclass
* @notapi
*/
void gaudioPlayReleaseDataBlockI(GDataBuffer *paud);
/**
* @brief Signal that all playing has now stopped
*
* @note Defined in the high level GAUDIO code for use by the GAUDIO play drivers.
*
* @iclass
* @notapi
*/
void gaudioPlayDoneI(void);
/**
* @brief Initialise the play driver
* @return gTrue if the channel, frequency and format 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
*/
gBool gaudio_play_lld_init(uint16_t channel, uint32_t frequency, ArrayDataFormat format);
/**
* @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 gaudioPlayGetDataBlockI().
*
* @api
*/
void gaudio_play_lld_start(void);
/**
* @brief Stop the audio output playing.
*
* @note Some drivers may only stop playing at a data block boundary.
* @note It is possible but unlikely for it to be called when playing has already stopped.
* @note It should not return until all active buffers (currently in use by the driver)
* have been returned to the free-list and @p gaudioPlayDoneI() has been called.
*
* @api
*/
void gaudio_play_lld_stop(void);
/**
* @brief Set the output volume.
* @return gTrue if successful.
*
* @param[in] vol 0->255 (0 = muted)
*
* @note Some drivers may not support this. They will return gFalse.
* @note For stereo devices, both channels are set to the same volume.
*
* @api
*/
gBool gaudio_play_lld_set_volume(uint8_t vol);
#ifdef __cplusplus
}
#endif
#endif /* GFX_USE_GAUDIO && GAUDIO_NEED_PLAY */
#endif /* _GAUDIO_PLAY_LLD_H */
/** @} */
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