USB stream control parameters
[USB application configuration]

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Detailed Description

Defines the way the USB stream control will operate.

The USB Stream Control embeds a mechanism that ensures a good audio playback by keeping synchronized both Host and Device, even if their sampling frequency are not strictly equivalent.

USB resynchronization methods
#define	USB_RESYNC_METHOD_EXT_CLOCK_SYNTHESIZER   8
	Use of an external clock synthesizer (e.g. the CL CS2200).
#define	USB_RESYNC_METHOD_FEEDBACK_ENDPOINT   4
	Use of a feedback endpoint.
#define	USB_RESYNC_METHOD_SOFT_ADAPTIF_SRC   2
	Pseudo adaptif Sampling Rate Conversion.
#define	USB_RESYNC_METHOD_SOFT_ADD_DEL_SAMPLES   1
Defines
#define	TIMER_USB_STREAM_MONITOR   700
	Period (in ms) of the polling of the buffers monitoring.
#define	USB_RESYNC_AUDIO_STREAM   ENABLED
	ENABLE to activate the USB audio resynchronization.
#define	USB_STREAM_BUFFER_NUMBER   16
	Number of buffers used in the USB stream FIFO.
#define	USB_STREAM_BUFFER_SIZE   256
	Size of a buffer (in bytes) used in the USB stream FIFO.
#define	USB_STREAM_RESYNC_PPM_STEPS   10
	Steps in PPM for the resynchronization.

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Define Documentation

#define TIMER_USB_STREAM_MONITOR   700

Period (in ms) of the polling of the buffers monitoring.

Definition at line 280 of file conf_usb.h.

#define USB_RESYNC_AUDIO_STREAM   ENABLED

ENABLE to activate the USB audio resynchronization.

Possible values ENABLED or DISABLED

Definition at line 285 of file conf_usb.h.

#define USB_RESYNC_METHOD_EXT_CLOCK_SYNTHESIZER   8

Use of an external clock synthesizer (e.g. the CL CS2200).

Definition at line 300 of file conf_usb.h.

#define USB_RESYNC_METHOD_FEEDBACK_ENDPOINT   4

Use of a feedback endpoint.

Definition at line 297 of file conf_usb.h.

#define USB_RESYNC_METHOD_SOFT_ADAPTIF_SRC   2

Pseudo adaptif Sampling Rate Conversion.

Definition at line 294 of file conf_usb.h.

#define USB_RESYNC_METHOD_SOFT_ADD_DEL_SAMPLES   1

Add/remove samples on the fly.

Definition at line 291 of file conf_usb.h.

#define USB_STREAM_BUFFER_NUMBER   16

Number of buffers used in the USB stream FIFO.

Definition at line 274 of file conf_usb.h.

Referenced by mmi_activity_display().

#define USB_STREAM_BUFFER_SIZE   256

Size of a buffer (in bytes) used in the USB stream FIFO.

It shall be equivalent to the pipe/endpoint from which the stream comes to.

Definition at line 271 of file conf_usb.h.

#define USB_STREAM_RESYNC_PPM_STEPS   10

Steps in PPM for the resynchronization.

Definition at line 277 of file conf_usb.h.