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[79.124.17.100]) by mx.google.com with ESMTP id lf30-20020a170907175e00b00992c5cf17f9si5778240ejc.43.2023.07.12.16.39.08; Wed, 12 Jul 2023 16:39:09 -0700 (PDT) Received-SPF: pass (google.com: domain of ffmpeg-devel-bounces@ffmpeg.org designates 79.124.17.100 as permitted sender) client-ip=79.124.17.100; Authentication-Results: mx.google.com; spf=pass (google.com: domain of ffmpeg-devel-bounces@ffmpeg.org designates 79.124.17.100 as permitted sender) smtp.mailfrom=ffmpeg-devel-bounces@ffmpeg.org Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id 07CA168C690; Thu, 13 Jul 2023 02:37:30 +0300 (EEST) X-Original-To: ffmpeg-devel@ffmpeg.org Delivered-To: ffmpeg-devel@ffmpeg.org Received: from relay3-d.mail.gandi.net (relay3-d.mail.gandi.net [217.70.183.195]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id 5B53468C66C for ; Thu, 13 Jul 2023 02:37:18 +0300 (EEST) Received: by mail.gandi.net (Postfix) with ESMTPSA id C1D2660007 for ; Wed, 12 Jul 2023 23:37:17 +0000 (UTC) From: Michael Niedermayer To: FFmpeg development discussions and patches Date: Thu, 13 Jul 2023 01:37:03 +0200 Message-Id: <20230712233706.449054-11-michael@niedermayer.cc> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230712233706.449054-1-michael@niedermayer.cc> References: <20230712233706.449054-1-michael@niedermayer.cc> MIME-Version: 1.0 X-GND-Sasl: michael@niedermayer.cc Subject: [FFmpeg-devel] [PATCH 11/14] avradio/sdrdemux: Basic prefilter for RDS X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" X-TUID: VnYmn4rfRgc2 25% lower error rate Signed-off-by: Michael Niedermayer --- libavradio/sdrdemux.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/libavradio/sdrdemux.c b/libavradio/sdrdemux.c index bbd756f1d6..c0ca420c84 100644 --- a/libavradio/sdrdemux.c +++ b/libavradio/sdrdemux.c @@ -1031,6 +1031,19 @@ static int demodulate_fm(SDRContext *sdr, Station *station, AVStream *st, AVPack memcpy(sdr->fm_block + i, sdr->fm_block + 3*carrier19_i, sizeof(AVComplexFloat)*len2_4_i); memcpy(sdr->fm_block + i + 2*sdr->fm_block_size_p2 - len2_4_i, sdr->fm_block + 3*carrier19_i - len2_4_i, sizeof(AVComplexFloat)*len2_4_i); + + //This improves the decoder performace from an error rate per packet of 0.539578 to 0.410425 + for (int j= 0; jfm_block[i+j].re *= W; + sdr->fm_block[i+j].im *= W; + if (j) { + sdr->fm_block[i + 2*sdr->fm_block_size_p2 - j].re *= W; + sdr->fm_block[i + 2*sdr->fm_block_size_p2 - j].im *= W; + } + } + sdr->fm_ifft_p2(sdr->fm_ifft_p2_ctx, sdr->fm_iside , sdr->fm_block + i, sizeof(AVComplexFloat)); synchronous_am_demodulationN(sdr->fm_iside, sdr->fm_icarrier, sdr->fm_window_p2, 2*sdr->fm_block_size_p2, 3); ff_sdr_decode_rds(sdr, station, sdr->fm_iside);