diff options
Diffstat (limited to 'src/core')
| -rw-r--r-- | src/core/ao_fec.h | 4 | ||||
| -rw-r--r-- | src/core/ao_viterbi.c | 14 |
2 files changed, 16 insertions, 2 deletions
diff --git a/src/core/ao_fec.h b/src/core/ao_fec.h index e3c55d6e..4fd398eb 100644 --- a/src/core/ao_fec.h +++ b/src/core/ao_fec.h @@ -66,8 +66,10 @@ ao_fec_encode(uint8_t *in, uint8_t len, uint8_t *out); * 'out' must be len/8 bytes long */ +#define AO_FEC_DECODE_BLOCK (8 * 32) /* callback must return multiples of this many bits */ + uint8_t -ao_fec_decode(uint8_t *in, uint16_t in_len, uint8_t *out, uint8_t out_len); +ao_fec_decode(uint8_t *in, uint16_t in_len, uint8_t *out, uint8_t out_len, uint16_t (*callback)()); /* * Interleave data packed in bytes. 'out' must be 'len' bytes long. diff --git a/src/core/ao_viterbi.c b/src/core/ao_viterbi.c index 77681556..69e9c1f5 100644 --- a/src/core/ao_viterbi.c +++ b/src/core/ao_viterbi.c @@ -91,7 +91,7 @@ ao_cost(struct ao_soft_sym a, struct ao_soft_sym b) */ uint8_t -ao_fec_decode(uint8_t *in, uint16_t len, uint8_t *out, uint8_t out_len) +ao_fec_decode(uint8_t *in, uint16_t len, uint8_t *out, uint8_t out_len, uint16_t (*callback)()) { static uint16_t cost[2][NUM_STATE]; /* path cost */ static uint16_t bits[2][NUM_STATE]; /* save bits to quickly output them */ @@ -105,6 +105,7 @@ ao_fec_decode(uint8_t *in, uint16_t len, uint8_t *out, uint8_t out_len) const uint8_t *whiten = ao_fec_whiten_table; uint16_t interleave; /* input byte array index */ struct ao_soft_sym s; /* input symbol pair */ + uint16_t avail; p = 0; for (state = 0; state < NUM_STATE; state++) { @@ -113,11 +114,22 @@ ao_fec_decode(uint8_t *in, uint16_t len, uint8_t *out, uint8_t out_len) } cost[0][0] = 0; + if (callback) + avail = 0; + else + avail = len; + o = 0; for (i = 0; i < len; i += 2) { b = i/2; n = p ^ 1; + if (!avail) { + avail = callback(); + if (!avail) + break; + } + /* Fetch one pair of input bytes, de-interleaving * the input. */ |