[{"id":37908,"web_url":"https://patchwork.libcamera.org/comment/37908/","msgid":"<3003abcc-59ab-4d5f-ad19-c8cf706f78bb@ideasonboard.com>","date":"2026-01-23T13:27:38","subject":"Re: [PATCH v2 1/1] libcamera: camera_sensor: Fix imageStream() for\n\tCameraSensorLegacy class","submitter":{"id":216,"url":"https://patchwork.libcamera.org/api/people/216/","name":"Barnabás Pőcze","email":"barnabas.pocze@ideasonboard.com"},"content":"Hi\n\n\n2026. 01. 23. 13:59 keltezéssel, Julien Vuillaumier írta:\n> The CameraSensor::imageStream() function has a default implementation\n> in the base class that returns {0, 0} as {pad, stream}, assuming that\n> the image pad is located on the pad index 0.\n> This assumption is correct most of the time, but not in some other\n> cases, for instance when an external ISP entity acts as the sensor.\n> Such entity would typically have sink pad(s) connected to the actual\n> sensor and source pad(s) connected to the downstream graph. Associated\n> pad indexes would likely be different from zero.\n> \n> CameraSensorLegacy subclass correctly handles this case in its\n> functions, using the pad_ variable discovered at init() time to access\n> the source pad index, instead of using a hardcoded zero value.\n> Exception is imageStream() that is not overriden in the\n> CameraSensorLegacy definition so keeps the default implementation of\n> the parent class, hardcoding the returned source pad index to zero.\n> \n> This change declares CameraSensor::imageStream() as a pure virtual to\n> let the subclasses provide an implementation. Implementation for\n> CameraSensorLegacy is added, based on pad_ variable usage.\n> \n> Signed-off-by: Julien Vuillaumier \n> ---\n\nAs far as I can see, this looks ok. It may be worth to add\n\n Fixes: 3feb4df755d5 (\"libcamera: camera_sensor: Add support for embedded data\")\n\nAlso, I'm wondering if you could maybe attach (part of) the output of\n`media-ctl -p` so that the situation is clear (even just as a reply here).\n\n\nRegards,\nBarnabás Pőcze\n\n> include/libcamera/internal/camera_sensor.h | 2 +-\n> src/libcamera/sensor/camera_sensor.cpp | 5 +----\n> src/libcamera/sensor/camera_sensor_legacy.cpp | 6 ++++++\n> 3 files changed, 8 insertions(+), 5 deletions(-)\n> \n> diff --git a/include/libcamera/internal/camera_sensor.h b/include/libcamera/internal/camera_sensor.h\n> index e6b72d22a..58e7df4a4 100644\n> --- a/include/libcamera/internal/camera_sensor.h\n> +++ b/include/libcamera/internal/camera_sensor.h\n> @@ -64,7 +64,7 @@ public:\n> \t\t\t\t Transform transform = Transform::Identity,\n> \t\t\t\t V4L2SubdeviceFormat *sensorFormat = nullptr) = 0;\n> \n> -\tvirtual V4L2Subdevice::Stream imageStream() const;\n> +\tvirtual V4L2Subdevice::Stream imageStream() const = 0;\n> \tvirtual std::optional embeddedDataStream() const;\n> \tvirtual V4L2SubdeviceFormat embeddedDataFormat() const;\n> \tvirtual int setEmbeddedDataEnabled(bool enable);\n> diff --git a/src/libcamera/sensor/camera_sensor.cpp b/src/libcamera/sensor/camera_sensor.cpp\n> index 05390d1e1..58affd8f5 100644\n> --- a/src/libcamera/sensor/camera_sensor.cpp\n> +++ b/src/libcamera/sensor/camera_sensor.cpp\n> @@ -200,6 +200,7 @@ CameraSensor::~CameraSensor() = default;\n> */\n> \n> /**\n> + * \\fn CameraSensor::imageStream()\n> * \\brief Retrieve the image source stream\n> *\n> * Sensors that produce multiple streams do not guarantee that the image stream\n> @@ -209,10 +210,6 @@ CameraSensor::~CameraSensor() = default;\n> *\n> * \\return The image source stream\n> */\n> -V4L2Subdevice::Stream CameraSensor::imageStream() const\n> -{\n> -\treturn { 0, 0 };\n> -}\n> \n> /**\n> * \\brief Retrieve the embedded data source stream\n> diff --git a/src/libcamera/sensor/camera_sensor_legacy.cpp b/src/libcamera/sensor/camera_sensor_legacy.cpp\n> index 39c34200b..d2583a615 100644\n> --- a/src/libcamera/sensor/camera_sensor_legacy.cpp\n> +++ b/src/libcamera/sensor/camera_sensor_legacy.cpp\n> @@ -84,6 +84,7 @@ public:\n> \t\t\t Transform transform = Transform::Identity,\n> \t\t\t V4L2SubdeviceFormat *sensorFormat = nullptr) override;\n> \n> +\tV4L2Subdevice::Stream imageStream() const override;\n> \tconst ControlList &properties() const override { return properties_; }\n> \tint sensorInfo(IPACameraSensorInfo *info) const override;\n> \tTransform computeTransform(Orientation *orientation) const override;\n> @@ -856,6 +857,11 @@ int CameraSensorLegacy::applyConfiguration(const SensorConfiguration &config,\n> \treturn 0;\n> }\n> \n> +V4L2Subdevice::Stream CameraSensorLegacy::imageStream() const\n> +{\n> +\treturn { pad_, 0 };\n> +}\n> +\n> int CameraSensorLegacy::sensorInfo(IPACameraSensorInfo *info) const\n> {\n> \tif (!bayerFormat_)","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 5C4F1BDCBF\n\tfor ;\n\tFri, 23 Jan 2026 13:27:43 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 6CA5F61FC4;\n\tFri, 23 Jan 2026 14:27:42 +0100 (CET)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 81A54615B2\n\tfor ;\n\tFri, 23 Jan 2026 14:27:41 +0100 (CET)","from [192.168.33.29] (185.221.142.123.nat.pool.zt.hu\n\t[185.221.142.123])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id 0F4449CE;\n\tFri, 23 Jan 2026 14:27:08 +0100 (CET)"],"Authentication-Results":"lancelot.ideasonboard.com; dkim=pass (1024-bit key;\n\tunprotected) header.d=ideasonboard.com header.i=@ideasonboard.com\n\theader.b=\"KsTb6VB8\"; dkim-atps=neutral","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1769174828;\n\tbh=2KZqney+RuCHphWttfq15ggLpqWbMqTucxs+d2cYRDw=;\n\th=Date:Subject:To:References:From:In-Reply-To:From;\n\tb=KsTb6VB8NLZoLW22kemZntCnxHq061jUxJZsqpxsUh1ICshVXapQ+cH9WpEGv7A1H\n\tXPwN6amw7K0F86NhpE6xV1ni+2ruBkGUhdz2EQuafCiS8ivZDq0unoALi6C8keyJQm\n\tNmQcYbeHTfdGA4QwGdAZEUM3zpeifxPTq25FE2tg=","Message-ID":"<3003abcc-59ab-4d5f-ad19-c8cf706f78bb@ideasonboard.com>","Date":"Fri, 23 Jan 2026 14:27:38 +0100","MIME-Version":"1.0","User-Agent":"Mozilla Thunderbird","Subject":"Re: [PATCH v2 1/1] libcamera: camera_sensor: Fix imageStream() for\n\tCameraSensorLegacy class","To":"Julien Vuillaumier ,\n\tlibcamera-devel@lists.libcamera.org","References":"<20260123125903.2469016-1-julien.vuillaumier@nxp.com>\n\t<20260123125903.2469016-2-julien.vuillaumier@nxp.com>","From":"=?utf-8?q?Barnab=C3=A1s_P=C5=91cze?= ","Content-Language":"en-US, hu-HU","In-Reply-To":"<20260123125903.2469016-2-julien.vuillaumier@nxp.com>","Content-Type":"text/plain; charset=UTF-8; format=flowed","Content-Transfer-Encoding":"8bit","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "}},{"id":37924,"web_url":"https://patchwork.libcamera.org/comment/37924/","msgid":"","date":"2026-01-23T18:34:02","subject":"[PATCH v2 1/1] libcamera: camera_sensor: Fix imageStream() for\n\tCameraSensorLegacy class","submitter":{"id":190,"url":"https://patchwork.libcamera.org/api/people/190/","name":"Julien Vuillaumier","email":"julien.vuillaumier@nxp.com"},"content":"Hi Barnabás,\n\nOn 23/01/2026 14:27, Barnabás Pőcze wrote:\n> 2026. 01. 23. 13:59 keltezéssel, Julien Vuillaumier írta:\n>> The CameraSensor::imageStream() function has a default implementation\n>> in the base class that returns {0, 0} as {pad, stream}, assuming that\n>> the image pad is located on the pad index 0.\n>> This assumption is correct most of the time, but not in some other\n>> cases, for instance when an external ISP entity acts as the sensor.\n>> Such entity would typically have sink pad(s) connected to the actual\n>> sensor and source pad(s) connected to the downstream graph. Associated\n>> pad indexes would likely be different from zero.\n>>\n>> CameraSensorLegacy subclass correctly handles this case in its\n>> functions, using the pad_ variable discovered at init() time to access\n>> the source pad index, instead of using a hardcoded zero value.\n>> Exception is imageStream() that is not overriden in the\n>> CameraSensorLegacy definition so keeps the default implementation of\n>> the parent class, hardcoding the returned source pad index to zero.\n>>\n>> This change declares CameraSensor::imageStream() as a pure virtual to\n>> let the subclasses provide an implementation. Implementation for\n>> CameraSensorLegacy is added, based on pad_ variable usage.\n>>\n>> Signed-off-by: Julien Vuillaumier \n>> ---\n> \n> As far as I can see, this looks ok. It may be worth to add\n> \n>   Fixes: 3feb4df755d5 (\"libcamera: camera_sensor: Add support for \n> embedded data\")\n\nI can add - is a new patch version desired to add the tag to the commit \nmessage?\n\n> Also, I'm wondering if you could maybe attach (part of) the output of\n> `media-ctl -p` so that the situation is clear (even just as a reply here).\n\nThe case is about the graph of subdevices:\nraw sensor -> external ISP -> MIPI CSI\n\nSome pipelines use the heuristic to consider the external ISP subdevice \nas the device to be controlled by the CameraSensor class [1].\nThat is supported by the CameraSensorLegacy subclass [2].\n\nHere is the `media-ctl -p` relevant extract for the graph\nOnsemi ar0144 sensor -> Onsemi ap1302 ISP -> NXP i.MX9 MIPI CSI\nIn that case, based on ap1302 ISP topology (2 sinks, 1 source), \nCameraSensor()::imageStream() shall report (pad, stream) = (2, 0) \ninstead of (0, 0).\n\n```\nmedia-ctl -p -d\n[...]\n- entity 115: csidev-4ad30000.csi (2 pads, 2 links, 1 route)\n type V4L2 subdev subtype Unknown flags 0\n device node name /dev/v4l-subdev18\n routes:\n 0/0 -> 1/0 [ACTIVE]\n pad0: SINK\n [stream:0 fmt:UYVY8_1X16/1280x800 field:none \ncolorspace:rec709 xfer:srgb ycbcr:601 quantization:lim-range]\n <- \"ap1302 2-003c\":2 [ENABLED]\n pad1: SOURCE\n [stream:0 fmt:UYVY8_1X16/1280x800 field:none \ncolorspace:rec709 xfer:srgb ycbcr:601 quantization:lim-range]\n -> \"4ac10000.syscon:formatter@20\":0 [ENABLED,IMMUTABLE]\n\n- entity 120: ap1302 2-003c (3 pads, 2 links, 0 routes)\n type V4L2 subdev subtype Unknown flags 0\n device node name /dev/v4l-subdev20\n pad0: SINK\n [stream:0 fmt:SGRBG12_1X12/1280x800 field:none \ncolorspace:srgb\n crop.bounds:(0,0)/1280x800\n crop:(0,0)/1280x800]\n <- \"ar0144 0\":0 [ENABLED,IMMUTABLE]\n pad1: SINK\n [stream:0 fmt:SGRBG12_1X12/1280x800 field:none \ncolorspace:srgb\n crop.bounds:(0,0)/1280x800\n crop:(0,0)/1280x800]\n pad2: SOURCE\n [stream:0 fmt:UYVY8_1X16/1280x800 field:none \ncolorspace:srgb\n crop.bounds:(0,0)/1280x800\n crop:(0,0)/1280x800]\n -> \"csidev-4ad30000.csi\":0 [ENABLED]\n\n- entity 124: ar0144 0 (1 pad, 1 link, 0 routes)\n type V4L2 subdev subtype Sensor flags 0\n device node name /dev/v4l-subdev19\n pad0: SOURCE\n [stream:0 fmt:SGRBG12_1X12/1280x800 field:none \ncolorspace:srgb]\n -> \"ap1302 2-003c\":0 [ENABLED,IMMUTABLE]\n\n```\n\n[1] \nhttps://git.libcamera.org/libcamera/libcamera.git/tree/src/libcamera/pipeline/simple/simple.cpp?h=v0.6.0#n1671\n[2] \nhttps://git.libcamera.org/libcamera/libcamera.git/tree/src/libcamera/sensor/camera_sensor_legacy.cpp?h=v0.6.0#n193\n\nThanks,\nJulien\n\n> \n> \n> Regards,\n> Barnabás Pőcze\n> \n>>   include/libcamera/internal/camera_sensor.h    | 2 +-\n>>   src/libcamera/sensor/camera_sensor.cpp        | 5 +----\n>>   src/libcamera/sensor/camera_sensor_legacy.cpp | 6 ++++++\n>>   3 files changed, 8 insertions(+), 5 deletions(-)\n>>\n>> diff --git a/include/libcamera/internal/camera_sensor.h b/include/ \n>> libcamera/internal/camera_sensor.h\n>> index e6b72d22a..58e7df4a4 100644\n>> --- a/include/libcamera/internal/camera_sensor.h\n>> +++ b/include/libcamera/internal/camera_sensor.h\n>> @@ -64,7 +64,7 @@ public:\n>>                                      Transform transform = \n>> Transform::Identity,\n>>                                      V4L2SubdeviceFormat *sensorFormat \n>> = nullptr) = 0;\n>>\n>> -     virtual V4L2Subdevice::Stream imageStream() const;\n>> +     virtual V4L2Subdevice::Stream imageStream() const = 0;\n>>       virtual std::optional \n>> embeddedDataStream() const;\n>>       virtual V4L2SubdeviceFormat embeddedDataFormat() const;\n>>       virtual int setEmbeddedDataEnabled(bool enable);\n>> diff --git a/src/libcamera/sensor/camera_sensor.cpp b/src/libcamera/ \n>> sensor/camera_sensor.cpp\n>> index 05390d1e1..58affd8f5 100644\n>> --- a/src/libcamera/sensor/camera_sensor.cpp\n>> +++ b/src/libcamera/sensor/camera_sensor.cpp\n>> @@ -200,6 +200,7 @@ CameraSensor::~CameraSensor() = default;\n>>    */\n>>\n>>   /**\n>> + * \\fn CameraSensor::imageStream()\n>>    * \\brief Retrieve the image source stream\n>>    *\n>>    * Sensors that produce multiple streams do not guarantee that the \n>> image stream\n>> @@ -209,10 +210,6 @@ CameraSensor::~CameraSensor() = default;\n>>    *\n>>    * \\return The image source stream\n>>    */\n>> -V4L2Subdevice::Stream CameraSensor::imageStream() const\n>> -{\n>> -     return { 0, 0 };\n>> -}\n>>\n>>   /**\n>>    * \\brief Retrieve the embedded data source stream\n>> diff --git a/src/libcamera/sensor/camera_sensor_legacy.cpp b/src/ \n>> libcamera/sensor/camera_sensor_legacy.cpp\n>> index 39c34200b..d2583a615 100644\n>> --- a/src/libcamera/sensor/camera_sensor_legacy.cpp\n>> +++ b/src/libcamera/sensor/camera_sensor_legacy.cpp\n>> @@ -84,6 +84,7 @@ public:\n>>                              Transform transform = Transform::Identity,\n>>                              V4L2SubdeviceFormat *sensorFormat = \n>> nullptr) override;\n>>\n>> +     V4L2Subdevice::Stream imageStream() const override;\n>>       const ControlList &properties() const override { return \n>> properties_; }\n>>       int sensorInfo(IPACameraSensorInfo *info) const override;\n>>       Transform computeTransform(Orientation *orientation) const \n>> override;\n>> @@ -856,6 +857,11 @@ int CameraSensorLegacy::applyConfiguration(const \n>> SensorConfiguration &config,\n>>       return 0;\n>>   }\n>>\n>> +V4L2Subdevice::Stream CameraSensorLegacy::imageStream() const\n>> +{\n>> +     return { pad_, 0 };\n>> +}\n>> +\n>>   int CameraSensorLegacy::sensorInfo(IPACameraSensorInfo *info) const\n>>   {\n>>       if (!bayerFormat_)\n>","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 5C742C3220\n\tfor 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,\n\tlibcamera-devel@lists.libcamera.org","References":"<20260123125903.2469016-1-julien.vuillaumier@nxp.com>\n\t<20260123125903.2469016-2-julien.vuillaumier@nxp.com>\n\t<3003abcc-59ab-4d5f-ad19-c8cf706f78bb@ideasonboard.com>","Content-Language":"en-US","From":"Julien Vuillaumier ","In-Reply-To":"<3003abcc-59ab-4d5f-ad19-c8cf706f78bb@ideasonboard.com>","Content-Type":"text/plain; charset=UTF-8; format=flowed","Content-Transfer-Encoding":"8bit","X-ClientProxiedBy":"AS4P251CA0023.EURP251.PROD.OUTLOOK.COM\n\t(2603:10a6:20b:5d3::20) To AM9PR04MB8147.eurprd04.prod.outlook.com\n\t(2603:10a6:20b:3e0::22)","MIME-Version":"1.0","X-MS-PublicTrafficType":"Email","X-MS-TrafficTypeDiagnostic":"AM9PR04MB8147:EE_|DB9PR04MB9646:EE_","X-MS-Office365-Filtering-Correlation-Id":"1d75042f-350d-4965-0c2f-08de5aadfbe0","X-MS-Exchange-SenderADCheck":"1","X-MS-Exchange-AntiSpam-Relay":"0","X-Microsoft-Antispam":"BCL:0;\n\tARA:13230040|19092799006|366016|376014|1800799024; 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