#include <stddef.h>
#include "conf_audio_mixer.h"
#include "conf_audio_player.h"
#include "compiler.h"
#include "audio.h"
#include "audio_mixer.h"
#include "board.h"

Macros
#define	AUDIO_MIXER_CODEC_COUNT (sizeof(AUDIO_MIXER_DACS) / sizeof(AUDIO_MIXER_DACS[0]))
	Number of DACs. More...

Functions
static void	audio_mixer_callback (uint32_t arg)
	Callback function the DACs drivers should invoke when out of samples. More...

void	audio_mixer_close_direct (void)
	Close the audio_mixer. More...

bool	audio_mixer_create_buffers_direct (uint8_t nb_buffers, size_t buffer_size)
	Creates DAC buffers. More...

void	audio_mixer_dacs_decrease_volume_direct (void)
	Decreases the output volume of the DACs. More...

void	audio_mixer_dacs_flush_direct (bool force)
	Flushes the sample buffer being output to the DACs. More...

uint8_t	audio_mixer_dacs_get_volume_direct (void)
	Get the average volume of the DACs. The value returned is in the range 0; 255 where 255 corresponds to the highest volume. More...

void	audio_mixer_dacs_increase_volume_direct (void)
	Increases the output volume of the DACs. More...

bool	audio_mixer_dacs_input_direct (void *sample_buffer, size_t sample_length)
	Inputs a sample buffer from the ADCs. More...

bool	audio_mixer_dacs_is_volume_muted_direct (void)
	Checks if the volume is muted or un-muted. . More...

bool	audio_mixer_dacs_output_direct (void *sample_buffer, size_t sample_length)
	Outputs a sample buffer to the DACs. More...

void	audio_mixer_dacs_set_volume_direct (uint8_t volume)
	set the average volume of the DACs. More...

void	audio_mixer_dacs_setup_direct (uint32_t sample_rate_hz, uint8_t num_channels, uint8_t bits_per_sample, bool swap_channels)
	Sets the DACs up with new settings. More...

void	audio_mixer_dacs_start_direct (uint32_t sample_rate_hz, uint8_t num_channels, uint8_t bits_per_sample, bool swap_channels)
	Starts the DACs. More...

void	audio_mixer_dacs_stop_direct (void)
	Stops the DACs. More...

void	audio_mixer_disable_dacs_direct (uint32_t dacs_mask)
	Disables the handling of the specified DACs by the audio mixer. More...

void	audio_mixer_enable_dacs_direct (uint32_t dacs_mask)
	Enables the handling of the specified DACs by the audio mixer. More...

void *	audio_mixer_get_buffer_direct (size_t size)
	This functions returns a NULL pointer when no buffer are free, else returns a free temporary buffer. More...

void	audio_mixer_mute_audio_direct (bool mute)
	Mute Audio if True. More...

Variables
struct {
void(* decrease_volume )(void)

void(* flush )(void)

uint8_t(* get_volume )(void)

void(* increase_volume )(void)

bool(* input )(void *sample_buffer, size_t sample_length)

bool(* is_volume_boosted )(void)

bool(* is_volume_muted )(void)

void(* mute_audio )(bool mute)

bool(* output )(void *sample_buffer, size_t sample_length)

void(* set_volume )(uint8_t volume)

void(* setup )(uint32_t sample_rate_hz, uint8_t num_channels, uint8_t bits_per_sample, bool swap_channels, void(*callback)(uint32_t arg), uint32_t callback_opt, uint32_t pba_hz)

void(* start )(uint32_t sample_rate_hz, uint8_t num_channels, uint8_t bits_per_sample, bool swap_channels, void(*callback)(uint32_t arg), uint32_t callback_opt, uint32_t pba_hz)

void(* stop )(void)

}	AUDIO_MIXER_DACS [] = AUDIO_MIXER_DACS_INTERFACES
	DACs interfaces. More...

struct {
uint8_t bits_per_sample

void ** buffers

uint8_t current_buffer

uint8_t nb_buffers

uint8_t num_channels

uint32_t sample_rate_hz

bool swap_channels

}	audio_mixer_dacs_settings
	DACs settings. More...

static uint32_t	audio_mixer_enabled_dacs_mask = 0x00000000
	Enabled DACs mask. More...

#define AUDIO_MIXER_CODEC_COUNT (sizeof(AUDIO_MIXER_DACS) / sizeof(AUDIO_MIXER_DACS[0]))

Number of DACs.

Referenced by audio_mixer_dacs_decrease_volume_direct(), audio_mixer_dacs_flush_direct(), audio_mixer_dacs_get_volume_direct(), audio_mixer_dacs_increase_volume_direct(), audio_mixer_dacs_input_direct(), audio_mixer_dacs_is_volume_muted_direct(), audio_mixer_dacs_output_direct(), audio_mixer_dacs_set_volume_direct(), audio_mixer_dacs_setup_direct(), audio_mixer_dacs_start_direct(), audio_mixer_dacs_stop_direct(), audio_mixer_disable_dacs_direct(), and audio_mixer_mute_audio_direct().

static void audio_mixer_callback ( uint32_t arg )

static

Callback function the DACs drivers should invoke when out of samples.

References AUDIO_ADC_OUT_OF_SAMPLE_CB, AUDIO_ADC_RELOAD_CB, AUDIO_DAC_OUT_OF_SAMPLE_CB, AUDIO_DAC_RELOAD_CB, and buff_player_dacs_end_of_pcm_buf().

Referenced by audio_mixer_dacs_setup_direct(), and audio_mixer_dacs_start_direct().

void audio_mixer_close_direct ( void )

Close the audio_mixer.

References audio_mixer_dacs_settings, i, and NULL.

bool audio_mixer_create_buffers_direct	(	uint8_t	nb_buffers,
		size_t	buffer_size
	)

Creates DAC buffers.

References audio_mixer_dacs_settings, buffers, i, j, and nb_buffers.

void audio_mixer_dacs_decrease_volume_direct ( void )

Decreases the output volume of the DACs.

Note: The DACs must have been started beforehand.

References AUDIO_MIXER_CODEC_COUNT, AUDIO_MIXER_DACS, audio_mixer_enabled_dacs_mask, and i.

void audio_mixer_dacs_flush_direct ( bool force )

Flushes the sample buffer being output to the DACs.

Parameters

force Force flushing means do not wait until all samples have been played before flushing the DAC.

References AUDIO_MIXER_CODEC_COUNT, AUDIO_MIXER_DACS, audio_mixer_enabled_dacs_mask, and i.

Referenced by buff_player_dacs_flush(), player_shutdown(), and usb_stream_new_sample_rate().

uint8_t audio_mixer_dacs_get_volume_direct ( void )

Get the average volume of the DACs.
The value returned is in the range 0; 255 where 255 corresponds to the highest volume.

Note: The DACs must have been started beforehand.

References AUDIO_MIXER_CODEC_COUNT, AUDIO_MIXER_DACS, audio_mixer_enabled_dacs_mask, count, i, and volume.

void audio_mixer_dacs_increase_volume_direct ( void )

Increases the output volume of the DACs.

Note: The DACs must have been started beforehand.

References AUDIO_MIXER_CODEC_COUNT, AUDIO_MIXER_DACS, audio_mixer_enabled_dacs_mask, and i.

bool audio_mixer_dacs_input_direct	(	void *	sample_buffer,
		size_t	sample_length
	)

Inputs a sample buffer from the ADCs.

Note: The ADCs must have been started beforehand.

References AUDIO_MIXER_CODEC_COUNT, AUDIO_MIXER_DACS, audio_mixer_enabled_dacs_mask, i, and input.

bool audio_mixer_dacs_is_volume_muted_direct ( void )

Checks if the volume is muted or un-muted.
.

Note: The DACs must have been started beforehand.

References AUDIO_MIXER_CODEC_COUNT, AUDIO_MIXER_DACS, audio_mixer_enabled_dacs_mask, count, and i.

bool audio_mixer_dacs_output_direct	(	void *	sample_buffer,
		size_t	sample_length
	)

Outputs a sample buffer to the DACs.

Note: The DACs must have been started beforehand.

References AUDIO_MIXER_CODEC_COUNT, AUDIO_MIXER_DACS, audio_mixer_enabled_dacs_mask, i, and output.

Referenced by buff_player_dacs_end_of_pcm_buf(), buff_player_dacs_output(), dac_sample_sent_cb(), usb_stream_fifo_get_used_room(), usb_stream_input(), and usb_stream_process().

void audio_mixer_dacs_set_volume_direct ( uint8_t volume )

set the average volume of the DACs.

Note: The DACs must have been started beforehand.

References AUDIO_MIXER_CODEC_COUNT, AUDIO_MIXER_DACS, audio_mixer_enabled_dacs_mask, count, and i.

void audio_mixer_dacs_setup_direct	(	uint32_t	sample_rate_hz,
		uint8_t	num_channels,
		uint8_t	bits_per_sample,
		bool	swap_channels
	)

Sets the DACs up with new settings.

Note: The DACs must have been started beforehand.

References AUDIO_ADC_OUT_OF_SAMPLE_CB, AUDIO_ADC_RELOAD_CB, AUDIO_DAC_OUT_OF_SAMPLE_CB, AUDIO_DAC_RELOAD_CB, audio_mixer_callback(), AUDIO_MIXER_CODEC_COUNT, AUDIO_MIXER_DACS, audio_mixer_dacs_settings, audio_mixer_enabled_dacs_mask, bits_per_sample, FPBA_HZ, i, if(), num_channels, sample_rate_hz, and swap_channels.

Referenced by buff_player_dacs_setup(), and usb_stream_init().

void audio_mixer_dacs_start_direct	(	uint32_t	sample_rate_hz,
		uint8_t	num_channels,
		uint8_t	bits_per_sample,
		bool	swap_channels
	)

Starts the DACs.

References AUDIO_ADC_OUT_OF_SAMPLE_CB, AUDIO_ADC_RELOAD_CB, AUDIO_DAC_OUT_OF_SAMPLE_CB, AUDIO_DAC_RELOAD_CB, audio_mixer_callback(), AUDIO_MIXER_CODEC_COUNT, AUDIO_MIXER_DACS, audio_mixer_dacs_settings, audio_mixer_enabled_dacs_mask, bits_per_sample, FPBA_HZ, i, if(), num_channels, sample_rate_hz, and swap_channels.

Referenced by audio_mixer_enable_dacs_direct().

void audio_mixer_dacs_stop_direct ( void )

Stops the DACs.

References AUDIO_MIXER_CODEC_COUNT, AUDIO_MIXER_DACS, audio_mixer_dacs_settings, audio_mixer_enabled_dacs_mask, and i.

void audio_mixer_disable_dacs_direct ( uint32_t dacs_mask )

Disables the handling of the specified DACs by the audio mixer.

References AUDIO_MIXER_CODEC_COUNT, AUDIO_MIXER_DACS, audio_mixer_dacs_settings, audio_mixer_enabled_dacs_mask, and i.

void audio_mixer_enable_dacs_direct ( uint32_t dacs_mask )

Enables the handling of the specified DACs by the audio mixer.

References audio_mixer_dacs_settings, audio_mixer_dacs_start_direct(), and audio_mixer_enabled_dacs_mask.

void* audio_mixer_get_buffer_direct ( size_t size )

This functions returns a NULL pointer when no buffer are free, else returns a free temporary buffer.

References audio_mixer_dacs_output, audio_mixer_dacs_settings, buffer, and NULL.

void audio_mixer_mute_audio_direct ( bool mute )

Mute Audio if True.

Parameters

mute	Set to true to mute the audio stream. Set to false otherwise.

References AUDIO_MIXER_CODEC_COUNT, AUDIO_MIXER_DACS, audio_mixer_enabled_dacs_mask, and i.

Referenced by buff_player_mute_audio().

struct { ... } AUDIO_MIXER_DACS[]

DACs interfaces.

Referenced by audio_mixer_dacs_decrease_volume_direct(), audio_mixer_dacs_flush_direct(), audio_mixer_dacs_get_volume_direct(), audio_mixer_dacs_increase_volume_direct(), audio_mixer_dacs_input_direct(), audio_mixer_dacs_is_volume_muted_direct(), audio_mixer_dacs_output_direct(), audio_mixer_dacs_set_volume_direct(), audio_mixer_dacs_setup_direct(), audio_mixer_dacs_start_direct(), audio_mixer_dacs_stop_direct(), audio_mixer_disable_dacs_direct(), and audio_mixer_mute_audio_direct().

struct { ... } audio_mixer_dacs_settings

Initial value:

=
{
  .sample_rate_hz   = 0,
  .num_channels     = 0,
  .bits_per_sample  = 0,
  .swap_channels    = false,
  .nb_buffers       = 0,
  .current_buffer   = 0,
  .buffers          = NULL
}