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Forward Error Correction (#24)

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* Preperation for FEC by adding new queue which buffers whole frames

* Add code for creating recovered RTP packet

* Add checks before repair missing packets

* Initial implementation for single FEC packet

* Implement FEC for multiple packets
This commit is contained in:
Iwan Timmer 2017-05-05 06:22:30 +02:00 • committed by Cameron Gutman
commit 9bf8d361a1
7 changed files with 1024 additions and 21 deletions
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42
reedsolomon/rs.h Normal file
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#ifndef __RS_H_
#define __RS_H_
/* use small value to save memory */
#define DATA_SHARDS_MAX 255
typedef struct _reed_solomon {
int data_shards;
int parity_shards;
int shards;
unsigned char* m;
unsigned char* parity;
} reed_solomon;
/**
* MUST initial one time
* */
void reed_solomon_init(void);
reed_solomon* reed_solomon_new(int data_shards, int parity_shards);
void reed_solomon_release(reed_solomon* rs);
/**
* encode a big size of buffer
* input:
* rs
* nr_shards: assert(0 == nr_shards % rs->data_shards)
* shards[nr_shards][block_size]
* */
int reed_solomon_encode(reed_solomon* rs, unsigned char** shards, int nr_shards, int block_size);
/**
* reconstruct a big size of buffer
* input:
* rs
* nr_shards: assert(0 == nr_shards % rs->data_shards)
* shards[nr_shards][block_size]
* marks[nr_shards] marks as errors
* */
int reed_solomon_reconstruct(reed_solomon* rs, unsigned char** shards, unsigned char* marks, int nr_shards, int block_size);
#endif