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[70.67.120.89]) by smtp.gmail.com with ESMTPSA id s22sm9504207pfe.150.2021.04.25.15.54.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 25 Apr 2021 15:54:29 -0700 (PDT) From: Deborah Brouwer To: linux-media@vger.kernel.org Cc: hverkuil@xs4all.nl, Deborah Brouwer Subject: [PATCH v2 1/2] cec-follower: increase precision of Audio Rate Control active sensing Date: Sun, 25 Apr 2021 15:54:06 -0700 Message-Id: <359f2292a67679b5dab5d9d1fda280bc80f34c40.1619389023.git.deborahbrouwer3563@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: References: In-Reply-To: References: Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Measure the interval since the last audio rate control message in nanoseconds instead of seconds. Increasing the precision catches audio rate messages that are late by less than a second. Signed-off-by: Deborah Brouwer --- utils/cec-follower/cec-processing.cpp | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/utils/cec-follower/cec-processing.cpp b/utils/cec-follower/cec-processing.cpp index 93db4059..243c9d09 100644 --- a/utils/cec-follower/cec-processing.cpp +++ b/utils/cec-follower/cec-processing.cpp @@ -29,8 +29,8 @@ /* Time between each polling message sent to a device */ #define POLL_PERIOD 15000 -/* The maximum interval in seconds between audio rate messages as defined in the spec */ -#define MAX_AUD_RATE_MSG_INTERVAL 2 +/* The maximum interval in nanoseconds between audio rate messages as defined in the spec */ +#define MAX_AUD_RATE_MSG_INTERVAL 2000000000 struct cec_enum_values { const char *type_name; @@ -241,7 +241,8 @@ static void aud_rate_msg_interval_check(__u64 ts_new, __u64 ts_old) * turned off the audio rate control. */ if (ts_old) { - unsigned interval = (ts_new - ts_old) / 1000000000; + __u64 interval = ts_new - ts_old; + if (interval > MAX_AUD_RATE_MSG_INTERVAL) { warn("The interval between Audio Rate Control messages was greater\n"); warn("than the Maxiumum Audio Rate Message Interval (2s).\n");