[{"id":34433,"web_url":"https://patchwork.libcamera.org/comment/34433/","msgid":"<7339d8b07a380d518016b8d661bc9604800f7a40.camel@ndufresne.ca>","date":"2025-06-05T20:06:09","subject":"Re: [PATCH] gstreamer: Fix libcamerasrc responding latency before\n\tsetting caps","submitter":{"id":30,"url":"https://patchwork.libcamera.org/api/people/30/","name":"Nicolas Dufresne","email":"nicolas@ndufresne.ca"},"content":"Le jeudi 05 juin 2025 à 15:37 +0900, Hou Qi a écrit :\n> Whenever a downstream element queries latency, libcamerasrc will always reply,\n> even though it has not yet determined the latency.\n> \n> However some downstream elements (e.g. glvideomixer/aggregator) will query the\n> latency before libcamerasrc sets the caps. When these elements get the latency,\n> they will start the caps negotiation. Since libcamerasrc has not yet determined\n> caps, invalid negotiation is performed and workflow is disrupted.\n> \n> So, set latency to 'GST_CLOCK_TIME_NONE' during initialization, and reply to the\n> query after libcamerasrc confirms the latency. At this time, libcamerasrc has also\n> completed caps negotiation and downstream elements work fine.\n> \n> In addition, every time the src pad task stops, we reset the latency to\n> GST_CLOCK_TIME_NONE to ensure that when next time task starts, the downstream\n> elements can generate out buffers after receiving the effective latency.\n> \n> Signed-off-by: Hou Qi \n\nVery nice catch.\n\nReviewed-by: Nicolas Dufresne \n\n> ---\n>  src/gstreamer/gstlibcamerapad.cpp | 5 +++++\n>  src/gstreamer/gstlibcamerasrc.cpp | 4 +++-\n>  2 files changed, 8 insertions(+), 1 deletion(-)\n> \n> diff --git a/src/gstreamer/gstlibcamerapad.cpp b/src/gstreamer/gstlibcamerapad.cpp\n> index 3bc2bc87..37a4689f 100644\n> --- a/src/gstreamer/gstlibcamerapad.cpp\n> +++ b/src/gstreamer/gstlibcamerapad.cpp\n> @@ -72,6 +72,10 @@ gst_libcamera_pad_query(GstPad *pad, GstObject *parent, GstQuery *query)\n>  \tif (query->type != GST_QUERY_LATENCY)\n>  \t\treturn gst_pad_query_default(pad, parent, query);\n>  \n> +\tGLibLocker lock(GST_OBJECT(self));\n> +\tif (self->latency == GST_CLOCK_TIME_NONE)\n> +\t\treturn FALSE;\n> +\n>  \t/* TRUE here means live, we assumes that max latency is the same as min\n>  \t * as we have no idea that duration of frames. */\n>  \tgst_query_set_latency(query, TRUE, self->latency, self->latency);\n> @@ -81,6 +85,7 @@ gst_libcamera_pad_query(GstPad *pad, GstObject *parent, GstQuery *query)\n>  static void\n>  gst_libcamera_pad_init(GstLibcameraPad *self)\n>  {\n> +\tself->latency = GST_CLOCK_TIME_NONE;\n>  \tGST_PAD_QUERYFUNC(self) = gst_libcamera_pad_query;\n>  }\n>  \n> diff --git a/src/gstreamer/gstlibcamerasrc.cpp b/src/gstreamer/gstlibcamerasrc.cpp\n> index b34f0897..b57d4a55 100644\n> --- a/src/gstreamer/gstlibcamerasrc.cpp\n> +++ b/src/gstreamer/gstlibcamerasrc.cpp\n> @@ -835,8 +835,10 @@ gst_libcamera_src_task_leave([[maybe_unused]] GstTask *task,\n>  \n>  \t{\n>  \t\tGLibRecLocker locker(&self->stream_lock);\n> -\t\tfor (GstPad *srcpad : state->srcpads_)\n> +\t\tfor (GstPad *srcpad : state->srcpads_) {\n> +\t\t\tgst_libcamera_pad_set_latency(srcpad, GST_CLOCK_TIME_NONE);\n>  \t\t\tgst_libcamera_pad_set_pool(srcpad, nullptr);\n> +\t\t}\n>  \t}\n>  \n>  \tg_clear_object(&self->allocator);","headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 63188C3237\n\tfor ;\n\tThu, 5 Jun 2025 20:06:16 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 0A99868DBD;\n\tThu, 5 Jun 2025 22:06:14 +0200 (CEST)","from mail-qk1-x72f.google.com (mail-qk1-x72f.google.com\n\t[IPv6:2607:f8b0:4864:20::72f])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 5FDA168D96\n\tfor ;\n\tThu, 5 Jun 2025 22:06:12 +0200 (CEST)","by mail-qk1-x72f.google.com with SMTP id\n\taf79cd13be357-7d09b0a5050so87610585a.3\n\tfor ;\n\tThu, 05 Jun 2025 13:06:12 -0700 (PDT)","from ?IPv6:2606:6d00:10:5285::5ac? 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Many thanks.\n\nRegards,\nQi Hou\n\n-----Original Message-----\nFrom: Nicolas Dufresne \nSent: 2025年6月6日 4:06\nTo: Qi Hou ; libcamera-devel@lists.libcamera.org\nCc: Jared Hu ; Julien Vuillaumier \nSubject: [EXT] Re: [PATCH] gstreamer: Fix libcamerasrc responding latency before setting caps\n\nCaution: This is an external email. Please take care when clicking links or opening attachments. When in doubt, report the message using the 'Report this email' button\n\n\nLe jeudi 05 juin 2025 à 15:37 +0900, Hou Qi a écrit :\n> Whenever a downstream element queries latency, libcamerasrc will \n> always reply, even though it has not yet determined the latency.\n>\n> However some downstream elements (e.g. glvideomixer/aggregator) will \n> query the latency before libcamerasrc sets the caps. When these \n> elements get the latency, they will start the caps negotiation. Since \n> libcamerasrc has not yet determined caps, invalid negotiation is performed and workflow is disrupted.\n>\n> So, set latency to 'GST_CLOCK_TIME_NONE' during initialization, and \n> reply to the query after libcamerasrc confirms the latency. At this \n> time, libcamerasrc has also completed caps negotiation and downstream elements work fine.\n>\n> In addition, every time the src pad task stops, we reset the latency \n> to GST_CLOCK_TIME_NONE to ensure that when next time task starts, the \n> downstream elements can generate out buffers after receiving the effective latency.\n>\n> Signed-off-by: Hou Qi \n\nVery nice catch.\n\nReviewed-by: Nicolas Dufresne \n\n> ---\n> src/gstreamer/gstlibcamerapad.cpp | 5 +++++ \n> src/gstreamer/gstlibcamerasrc.cpp | 4 +++-\n> 2 files changed, 8 insertions(+), 1 deletion(-)\n>\n> diff --git a/src/gstreamer/gstlibcamerapad.cpp \n> b/src/gstreamer/gstlibcamerapad.cpp\n> index 3bc2bc87..37a4689f 100644\n> --- a/src/gstreamer/gstlibcamerapad.cpp\n> +++ b/src/gstreamer/gstlibcamerapad.cpp\n> @@ -72,6 +72,10 @@ gst_libcamera_pad_query(GstPad *pad, GstObject *parent, GstQuery *query)\n> if (query->type != GST_QUERY_LATENCY)\n> return gst_pad_query_default(pad, parent, query);\n>\n> + GLibLocker lock(GST_OBJECT(self));\n> + if (self->latency == GST_CLOCK_TIME_NONE)\n> + return FALSE;\n> +\n> /* TRUE here means live, we assumes that max latency is the same as min\n> * as we have no idea that duration of frames. */\n> gst_query_set_latency(query, TRUE, self->latency, \n> self->latency); @@ -81,6 +85,7 @@ gst_libcamera_pad_query(GstPad *pad, \n> GstObject *parent, GstQuery *query) static void \n> gst_libcamera_pad_init(GstLibcameraPad *self) {\n> + self->latency = GST_CLOCK_TIME_NONE;\n> GST_PAD_QUERYFUNC(self) = gst_libcamera_pad_query; }\n>\n> diff --git a/src/gstreamer/gstlibcamerasrc.cpp \n> b/src/gstreamer/gstlibcamerasrc.cpp\n> index b34f0897..b57d4a55 100644\n> --- a/src/gstreamer/gstlibcamerasrc.cpp\n> +++ b/src/gstreamer/gstlibcamerasrc.cpp\n> @@ -835,8 +835,10 @@ gst_libcamera_src_task_leave([[maybe_unused]] \n> GstTask *task,\n>\n> {\n> GLibRecLocker locker(&self->stream_lock);\n> - for (GstPad *srcpad : state->srcpads_)\n> + for (GstPad *srcpad : state->srcpads_) {\n> + gst_libcamera_pad_set_latency(srcpad, \n> + GST_CLOCK_TIME_NONE);\n> gst_libcamera_pad_set_pool(srcpad, nullptr);\n> + }\n> }\n>\n> g_clear_object(&self->allocator);","headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 49DDBBDE6B\n\tfor ;\n\tWed, 18 Jun 2025 02:10:06 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 1734968DC7;\n\tWed, 18 Jun 2025 04:10:05 +0200 (CEST)","from MRWPR03CU001.outbound.protection.outlook.com\n\t(mail-francesouthazlp170110003.outbound.protection.outlook.com\n\t[IPv6:2a01:111:f403:c207::3])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 754CA614E1\n\tfor ;\n\tWed, 18 Jun 2025 04:10:03 +0200 (CEST)","from PAXPR04MB8285.eurprd04.prod.outlook.com\n\t(2603:10a6:102:1ca::15)\n\tby DBBPR04MB7706.eurprd04.prod.outlook.com (2603:10a6:10:208::21)\n\twith Microsoft SMTP Server (version=TLS1_2,\n\tcipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8835.30;\n\tWed, 18 Jun 2025 02:10:01 +0000","from PAXPR04MB8285.eurprd04.prod.outlook.com\n\t([fe80::e003:8fb:64ea:acfd]) by\n\tPAXPR04MB8285.eurprd04.prod.outlook.com\n\t([fe80::e003:8fb:64ea:acfd%6]) with mapi id 15.20.8835.027;\n\tWed, 18 Jun 2025 02:10:01 +0000"],"Authentication-Results":["lancelot.ideasonboard.com; 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