fecdec_filter.c File Reference

A filter that fec-decodes an audio stream. More...

#include <regex.h>
#include "para.h"
#include "error.h"
#include "list.h"
#include "sched.h"
#include "buffer_tree.h"
#include "filter.h"
#include "string.h"
#include "portable_io.h"
#include "fec.h"
#include "fd.h"

Macros
#define	NUM_FEC_GROUPS   3
	How many FEC groups to store in memory. More...
#define	FOR_EACH_FECDEC_GROUP(g, d)
	Iterate over all fecdec groups. More...

Enumerations
enum	fec_group_usability { FEC_GROUP_UNUSABLE, FEC_GROUP_USABLE, FEC_GROUP_USABLE_SKIP_HEADER, FEC_GROUP_USABLE_WITH_HEADER }
	The different states of a complete FEC group. More...

Variables
const struct filter	lsg_filter_cmd_com_fecdec_user_data

Detailed Description

A filter that fec-decodes an audio stream.

Macro Definition Documentation

NUM_FEC_GROUPS

#define NUM_FEC_GROUPS   3

How many FEC groups to store in memory.

Packet reordering requires to keep more than one FEC group in memory because slices belonging to the next FEC group may arrive before the current FEC group is complete.

FOR_EACH_FECDEC_GROUP

#define FOR_EACH_FECDEC_GROUP	(		g,
			d
	)

Value:

        for (g = (d)->groups; \
        (g) < (d)->groups + NUM_FEC_GROUPS; (g)++)

Iterate over all fecdec groups.

Enumeration Type Documentation

fec_group_usability

enum fec_group_usability

The different states of a complete FEC group.

Even if a FEC group has been received successfully, it probably can not be used right away because some streams (ogg, wma) need to receive an audio file header before decoding can start.

Enumerator
FEC_GROUP_UNUSABLE	Drop the group (because we did not receive the header yet).
FEC_GROUP_USABLE	Use all data in the group.
FEC_GROUP_USABLE_SKIP_HEADER	Use the group, but drop its audio file header.
FEC_GROUP_USABLE_WITH_HEADER	Use the group, including its header.

Variable Documentation

lsg_filter_cmd_com_fecdec_user_data

const struct filter lsg_filter_cmd_com_fecdec_user_data

Initial value:

= {
        .open = fecdec_open,
        .pre_monitor = generic_filter_pre_monitor,
        .post_monitor = fecdec_post_monitor,
        .close = fecdec_close,
}