#include <stdio.h>
#include "conf_usb.h"
#include "conf_audio_player.h"
#include "audio_mixer.h"
#include "usb_drv.h"
#include "usb_stream_player.h"
#include "dsp.h"
#include "cycle_counter.h"

Macros
#define	BROKEN_STREAM_TIMER 4000

Functions
void	dac_sample_sent_cb (void)
	This callback function is called when the DAC interrupt has sent the buffer 'n-1' and switches to buffer 'n'. More...

void	dac_underflow_cb (void)
	This callback function is called when the PWM DAC interrupt does not have any more audio samples (i.e. More...

void	player_init (void)

void	player_shutdown (void)

void	usb_stream_close (void)

static int	usb_stream_count_nb_buffer (buffer_state_t state)
	Returns the number of buffer filtered by state. More...

static int	usb_stream_current_buffer_size_left (void)
	Returns the length of the free part of the current buffer size. More...

static void	usb_stream_fill_input_buffers (void *buffer, int size, int nb_channels, int bits_per_sample)

uint32_t	usb_stream_get_buffer_level ()
	This function returns the number of full buffers. More...

uint16_t	usb_stream_get_counter ()
	This function returns the internal audio counter. More...

static void *	usb_stream_get_current_buffer_for_writing (int channel)
	Returns a pointer on free space where to store new samples. More...

uint8_t	usb_stream_get_status (void)

uint16_t	usb_stream_get_stream_status ()
	This function returns the audio status. More...

void	usb_stream_init (uint32_t sample_rate_hz, uint8_t num_channels, uint8_t bits_per_sample, bool swap_channels)
	This function initializes the USB Stream driver. More...

int	usb_stream_input (usb_stream_side_t side, uint8_t pipe_in, uint32_t *pFifoCount)
	This function takes the stream coming from the selected USB pipe and sends it to the DAC driver. More...

bool	usb_stream_new_sample_rate (uint32_t sample_rate)
	Sync the sample rate of the audio output stream with the USB stream. More...

void	usb_stream_out_of_samples (void)

int32_t	usb_stream_ppm_get (void)
	This function returns the PPM differences between the input audio stream frequency and the DAC output frequency. More...

static bool	usb_stream_process (void)

void	usb_stream_resync (void)
	This function ensures that no underflow/underflow will never occur by adjusting the SSC/ABDAC frequencies. More...

bool	usb_stream_task (void)

static void	usb_stream_update_buffers (int written_buffer_size)
	Update usb_stream_context->current_buffer_index usb_stream_context->current_buffer. More...

Variables
static t_cpu_time	broken_stream_timer

volatile uint16_t	usb_stream_cnt =0

usb_stream_context_t *	usb_stream_context = NULL

#define BROKEN_STREAM_TIMER 4000

Referenced by usb_stream_init(), and usb_stream_input().

void dac_sample_sent_cb ( void )

This callback function is called when the DAC interrupt has sent the buffer 'n-1' and switches to buffer 'n'.

The aim of this function is thus to prepare the buffer 'n+1'; so that there is always a pending buffer for the interrupt.

void dac_underflow_cb ( void )

This callback function is called when the PWM DAC interrupt does not have any more audio samples (i.e.

"famine").

void player_init ( void )

Referenced by device_audio_task_init(), and host_audio_task_init().

void player_shutdown ( void )

Referenced by host_audio_task_shutdown().

void usb_stream_close ( void )

References dsp16_resampling_free(), i, NULL, and usb_stream_context_t::status.

Referenced by player_shutdown(), and usb_stream_init().

static int usb_stream_count_nb_buffer ( buffer_state_t state )

static

Returns the number of buffer filtered by state.

References count, and current_buffer.

Referenced by usb_stream_get_buffer_level(), usb_stream_input(), and usb_stream_task().

static int usb_stream_current_buffer_size_left ( void )

inlinestatic

Returns the length of the free part of the current buffer size.

Referenced by usb_stream_fill_input_buffers().

static void usb_stream_fill_input_buffers	(	void *	buffer,
		int	size,
		int	nb_channels,
		int	bits_per_sample
	)

static

References i, j, Min, swap16, swap32, usb_stream_current_buffer_size_left(), USB_STREAM_ERROR_OVERFLOW, USB_STREAM_ERROR_UNSUPPORTED, usb_stream_get_current_buffer_for_writing(), and usb_stream_update_buffers().

Referenced by usb_stream_input().

uint32_t usb_stream_get_buffer_level ( void )

This function returns the number of full buffers.

uint16_t usb_stream_get_counter ( void )

This function returns the internal audio counter.

static void * usb_stream_get_current_buffer_for_writing ( int channel )

inlinestatic

Returns a pointer on free space where to store new samples.

References current_buffer, and NULL.

Referenced by usb_stream_fill_input_buffers().

uint8_t usb_stream_get_status ( void )

References usb_stream_context_t::status.

uint16_t usb_stream_get_stream_status ( void )

This function returns the audio status.

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

This function initializes the USB Stream driver.

Referenced by audio_speaker_set_sample_freq(), device_audio_task_init(), host_audio_task(), and usb_stream_new_sample_rate().

int usb_stream_input	(	usb_stream_side_t	side,
		uint8_t	pipe_in,
		uint32_t *	pFifoCount
	)

This function takes the stream coming from the selected USB pipe and sends it to the DAC driver.

Moreover, it ensures that both input and output stream keep synchronized by adding or deleting samples.

Parameters

side	USB_STREAM_HOST for USB host, USB_STREAM_DEVICE for device.
pipe_in	Number of the addressed pipe
pFifoCount	(return parameter) NULL or pointer to the number of used buffers at this time

Returns: status: (USB_STREAM_STATUS_OK, USB_STREAM_STATUS_NOT_SYNCHRONIZED, USB_STREAM_STATUS_SPEED_UP, USB_STREAM_STATUS_SLOW_DOWN, USB_STREAM_STATUS_BUFFER_OVERFLOW)

Referenced by device_audio_task(), and host_audio_task().

bool usb_stream_new_sample_rate ( uint32_t sample_rate )

Sync the sample rate of the audio output stream with the USB stream.

Return values