diff options
| author | Philipp Maier <pmaier@sysmocom.de> | 2017-12-16 03:42:15 +0700 |
|---|---|---|
| committer | Vadim Yanitskiy <axilirator@gmail.com> | 2018-01-15 20:12:03 +0000 |
| commit | 40def49ac4b8babbd1b17c232137ce50a428706b (patch) | |
| tree | bd7fe78e287a432825f765fa2a42e96fd857de84 /include/osmocom/codec | |
| parent | c0771d62c19a09608a570a433da5c0c9de6f4884 (diff) | |
libosmocodec: implement ECU (Error Concealment Unit) for FR
When a bad GSM voice frame is received, it's being replaced
by a silence frame. This may cause unpleasant audio effects.
This change implements a functionality to craft a replacement
frame from the last known good frame. Currently, only FR is
supported, support for other codecs may be added latter.
Change-Id: I06a21f60db01bfe1c2b838f93866fad1d53fdcd1
Diffstat (limited to 'include/osmocom/codec')
| -rw-r--r-- | include/osmocom/codec/ecu.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/osmocom/codec/ecu.h b/include/osmocom/codec/ecu.h new file mode 100644 index 00000000..f7a29a00 --- /dev/null +++ b/include/osmocom/codec/ecu.h @@ -0,0 +1,15 @@ +#pragma once + +#include <stdint.h> +#include <stdbool.h> + +#include <osmocom/codec/codec.h> + +/* Codec independent ECU state */ +struct osmo_ecu_fr_state { + bool subsequent_lost_frame; + uint8_t frame_backup[GSM_FR_BYTES]; +}; + +void osmo_ecu_fr_reset(struct osmo_ecu_fr_state *state, uint8_t *frame); +int osmo_ecu_fr_conceal(struct osmo_ecu_fr_state *state, uint8_t *frame); |