From: Michael Niedermayer <michael@niedermayer.cc>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: [FFmpeg-devel] [PATCH 4/6] avradio/sdrdemux: adjust frequency precission in probing depending on modulation
Date: Wed, 5 Jul 2023 00:23:00 +0200
Message-ID: <20230704222302.1129450-4-michael@niedermayer.cc> (raw)
In-Reply-To: <20230704222302.1129450-1-michael@niedermayer.cc>
for AM we can find the frequency very precissely, for FM currently not so
much
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
libavradio/sdrdemux.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/libavradio/sdrdemux.c b/libavradio/sdrdemux.c
index 90f6805c3b..92b1e2b170 100644
--- a/libavradio/sdrdemux.c
+++ b/libavradio/sdrdemux.c
@@ -166,9 +166,10 @@ static int create_station(SDRContext *sdr, Station *candidate_station) {
return best_station_index;
}
for (i=0; i<sdr->nb_candidate_stations; i++) {
+ int freq_precission = modulation == AM ? 5 : 50;
double delta = fabs(sdr->candidate_station[i]->frequency - freq);
// Station already added, or we have 2 rather close stations
- if (modulation == sdr->candidate_station[i]->modulation && delta < 10 && sdr->candidate_station[i] != candidate_station) {
+ if (modulation == sdr->candidate_station[i]->modulation && delta < freq_precission && sdr->candidate_station[i] != candidate_station) {
nb_candidate_match++;
}
if (modulation != sdr->candidate_station[i]->modulation && delta < (bandwidth + sdr->candidate_station[i]->bandwidth)/2.1)
--
2.31.1
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next prev parent reply other threads:[~2023-07-04 22:23 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-04 22:22 [FFmpeg-devel] [PATCH 1/6] avradio/sdrdemux: end on EOF dont wraparound Michael Niedermayer
2023-07-04 22:22 ` [FFmpeg-devel] [PATCH 2/6] avradio: Fill in missing bandwidth values at 80% of frequency Michael Niedermayer
2023-07-04 22:22 ` [FFmpeg-devel] [PATCH 3/6] avradio/sdrdemux: Skip probing in the area outside the bandwidth Michael Niedermayer
2023-07-04 22:23 ` Michael Niedermayer [this message]
2023-07-04 22:23 ` [FFmpeg-devel] [PATCH 5/6] avradio/sdrdemux: When searching for stations move in smaller steps Michael Niedermayer
2023-07-04 22:23 ` [FFmpeg-devel] [PATCH 6/6] avradio/sdrdemux: slightly different normalization of FM scores Michael Niedermayer
2023-07-05 23:16 ` [FFmpeg-devel] [PATCH 1/6] avradio/sdrdemux: end on EOF dont wraparound Michael Niedermayer
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