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[70.67.120.89]) by smtp.gmail.com with ESMTPSA id q25sm7823251pfs.152.2021.04.24.22.46.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 24 Apr 2021 22:46:27 -0700 (PDT) From: Deborah Brouwer To: linux-media@vger.kernel.org Cc: hverkuil@xs4all.nl, Deborah Brouwer Subject: [PATCH] cec-follower: detect the cessation of Audio Rate Control messages Date: Sat, 24 Apr 2021 22:46:14 -0700 Message-Id: <20210425054614.27822-1-deborahbrouwer3563@gmail.com> X-Mailer: git-send-email 2.17.1 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 | 17 ++++++++++------- 1 file changed, 10 insertions(+), 7 deletions(-) diff --git a/utils/cec-follower/cec-processing.cpp b/utils/cec-follower/cec-processing.cpp index 93db4059..111b3604 100644 --- a/utils/cec-follower/cec-processing.cpp +++ b/utils/cec-follower/cec-processing.cpp @@ -233,18 +233,20 @@ 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(__u64 ts_new, struct node *node) { /* - * 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) { unsigned interval = (ts_new - ts_old) / 1000000000; 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; } } } @@ -802,7 +804,6 @@ 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); node->state.last_aud_rate_rx_ts = 0; return; case CEC_OP_AUD_RATE_WIDE_STD: @@ -811,7 +812,6 @@ 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); node->state.last_aud_rate_rx_ts = msg.rx_ts; return; default: @@ -1033,6 +1033,9 @@ void testProcessing(struct node *node, bool wallclock) node->state.rc_state = NOPRESS; } } + + if (node->has_aud_rate) + aud_rate_msg_interval_check(ts_now, node); } mode = CEC_MODE_INITIATOR; doioctl(node, CEC_S_MODE, &mode);