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Avoid FEC regeneration and DTMF blanking for null AMBE data

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FEC recalculation always reports errors for null AMBE frames, and
there is no DTMF present by definition.

In practice, null AMBE data is often (always?) sent by the Kenwood
TH-D74 in the first 21 voice frames, and I've also seen it at the end
of a fast data transmission.
This commit is contained in:
Tim Stewart
2020-12-13 16:28:47 -05:00
parent efe9b3d459
commit b2844bc0a6
2 changed files with 23 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
DStarControl.cpp
View File

@@ -165,12 +165,25 @@ unsigned int CDStarControl::maybeFixupVoiceFrame(
*skip_dtmf_blanking_frames = FAST_DATA_BEEP_GRACE_FRAMES;
LogMessage("%s frame %u: found fast data (cont.)", log_prefix, n);
} else {
if (n == 1U) {
bool voice_sync_data_is_null_ambe_data = false;
bool data_is_null_ambe_data = false;
if ((n == 1U) && (::memcmp(voice_sync_data + offset, DSTAR_NULL_AMBE_DATA_BYTES_SCRAMBLED, DSTAR_VOICE_FRAME_LENGTH_BYTES) == 0)) {
LogMessage("%s frame 0: *** Null AMBE data detected in voice frame ***", log_prefix);
voice_sync_data_is_null_ambe_data = true;
}
if (::memcmp(data + offset, DSTAR_NULL_AMBE_DATA_BYTES_SCRAMBLED, DSTAR_VOICE_FRAME_LENGTH_BYTES) == 0) {
LogMessage("%s frame %u: *** Null AMBE data detected in voice frame ***", log_prefix, n);
data_is_null_ambe_data = true;
}
if ((n == 1U) && !voice_sync_data_is_null_ambe_data) {
LogMessage("%s frame 0: *** REGENERATING FEC ***", log_prefix);
errors += m_fec.regenerateDStar(voice_sync_data + offset);
}
LogMessage("%s frame %u: *** REGENERATING FEC ***", log_prefix, n);
errors += m_fec.regenerateDStar(data + offset);
if (!data_is_null_ambe_data) {
LogMessage("%s frame %u: *** REGENERATING FEC ***", log_prefix, n);
errors += m_fec.regenerateDStar(data + offset);
}
if (blank_dtmf && (*skip_dtmf_blanking_frames > 0U)) {
(*skip_dtmf_blanking_frames)--;
@@ -180,12 +193,14 @@ unsigned int CDStarControl::maybeFixupVoiceFrame(
LogMessage("%s frame %u: *** Not BLANKING DTMF (left to skip: %u) ***",
log_prefix, n, *skip_dtmf_blanking_frames);
} else if (blank_dtmf && (*skip_dtmf_blanking_frames == 0U)) {
if (n == 1U) {
if ((n == 1U) && !voice_sync_data_is_null_ambe_data) {
LogMessage("%s frame 0: *** BLANKING DTMF ***", log_prefix);
blankDTMF(voice_sync_data + offset);
}
LogMessage("%s frame %u: *** BLANKING DTMF ***", log_prefix, n);
blankDTMF(data + offset);
if (!data_is_null_ambe_data) {
LogMessage("%s frame %u: *** BLANKING DTMF ***", log_prefix, n);
blankDTMF(data + offset);
}
}
}