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[70.67.120.89]) by smtp.gmail.com with ESMTPSA id s22sm9504207pfe.150.2021.04.25.15.54.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 25 Apr 2021 15:54:33 -0700 (PDT) From: Deborah Brouwer To: linux-media@vger.kernel.org Cc: hverkuil@xs4all.nl, Deborah Brouwer Subject: [PATCH v2 2/2] cec-follower: detect the cessation of Audio Rate Control messages Date: Sun, 25 Apr 2021 15:54:07 -0700 Message-Id: <03c855c4a2072a4a174415198e2e44932af75fcd.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 If the controlling device simply stops sending audio rate messages, give the cec-follower the ability to detect that it has not received an audio rate message within 2 seconds as required. The cec-follower will quit the audio rate controlled mode. Eliminate the need to measure an interval between two audio rate messages. Signed-off-by: Deborah Brouwer --- utils/cec-follower/cec-processing.cpp | 20 +++++++++++++------- 1 file changed, 13 insertions(+), 7 deletions(-) diff --git a/utils/cec-follower/cec-processing.cpp b/utils/cec-follower/cec-processing.cpp index 243c9d09..dd6fd05c 100644 --- a/utils/cec-follower/cec-processing.cpp +++ b/utils/cec-follower/cec-processing.cpp @@ -233,19 +233,22 @@ static __u8 current_power_state(struct node *node) return CEC_OP_POWER_STATUS_TO_STANDBY; } -static void aud_rate_msg_interval_check(__u64 ts_new, __u64 ts_old) +static void aud_rate_msg_interval_check(struct node *node, __u64 ts_new) { /* - * The interval between messages is not relevant if this is the - * first audio rate control message or if the previous message - * turned off the audio rate control. + * The interval since the last audio rate message is not relevant + * unless the Source is currently in audio rate controlled mode. */ + __u64 ts_old = node->state.last_aud_rate_rx_ts; + if (ts_old) { __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("The interval since the last Audio Rate Control message was greater\n"); warn("than the Maxiumum Audio Rate Message Interval (2s).\n"); + warn("Turning off audio rate control.\n"); + node->state.last_aud_rate_rx_ts = 0; } } } @@ -803,7 +806,7 @@ static void processMsg(struct node *node, struct cec_msg &msg, unsigned me) switch (msg.msg[2]) { case CEC_OP_AUD_RATE_OFF: - aud_rate_msg_interval_check(msg.rx_ts, node->state.last_aud_rate_rx_ts); + aud_rate_msg_interval_check(node, msg.rx_ts); node->state.last_aud_rate_rx_ts = 0; return; case CEC_OP_AUD_RATE_WIDE_STD: @@ -812,7 +815,7 @@ static void processMsg(struct node *node, struct cec_msg &msg, unsigned me) case CEC_OP_AUD_RATE_NARROW_STD: case CEC_OP_AUD_RATE_NARROW_FAST: case CEC_OP_AUD_RATE_NARROW_SLOW: - aud_rate_msg_interval_check(msg.rx_ts, node->state.last_aud_rate_rx_ts); + aud_rate_msg_interval_check(node, msg.rx_ts); node->state.last_aud_rate_rx_ts = msg.rx_ts; return; default: @@ -1034,6 +1037,9 @@ void testProcessing(struct node *node, bool wallclock) node->state.rc_state = NOPRESS; } } + + if (node->has_aud_rate) + aud_rate_msg_interval_check(node, ts_now); } mode = CEC_MODE_INITIATOR; doioctl(node, CEC_S_MODE, &mode); -- 2.17.1