From patchwork Mon Apr 28 09:02:32 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Sven_P=C3=BCschel?= X-Patchwork-Id: 23279 Return-Path: X-Original-To: parsemail@patchwork.libcamera.org Delivered-To: parsemail@patchwork.libcamera.org Received: from lancelot.ideasonboard.com (lancelot.ideasonboard.com [92.243.16.209]) by patchwork.libcamera.org (Postfix) with ESMTPS id 6B1EFC3321 for ; Mon, 28 Apr 2025 09:05:23 +0000 (UTC) Received: from lancelot.ideasonboard.com (localhost [IPv6:::1]) by lancelot.ideasonboard.com (Postfix) with ESMTP id 148F468B38; Mon, 28 Apr 2025 11:05:21 +0200 (CEST) Received: from metis.whiteo.stw.pengutronix.de (metis.whiteo.stw.pengutronix.de [IPv6:2a0a:edc0:2:b01:1d::104]) by lancelot.ideasonboard.com (Postfix) with ESMTPS id 3A71D68AD9 for ; Mon, 28 Apr 2025 11:05:07 +0200 (CEST) Received: from ptz.office.stw.pengutronix.de ([2a0a:edc0:0:900:1d::77] helo=peter.guest.stw.pengutronix.de) by metis.whiteo.stw.pengutronix.de with esmtp (Exim 4.92) (envelope-from ) id 1u9KQE-0001au-TP; Mon, 28 Apr 2025 11:05:06 +0200 From: =?utf-8?q?Sven_P=C3=BCschel?= To: libcamera-devel@lists.libcamera.org Cc: =?utf-8?b?TsOtY29sYXMgRi4gUi4gQS4gUHJhZG8=?= , Paul Elder , Jacopo Mondi , =?utf-8?q?Sven_P=C3=BCschel?= Subject: [PATCH v11 07/19] libcamera: pipeline: vimc, uvcvideo: Don't rely on bufferCount Date: Mon, 28 Apr 2025 11:02:32 +0200 Message-ID: <20250428090413.38234-8-s.pueschel@pengutronix.de> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250428090413.38234-1-s.pueschel@pengutronix.de> References: <20250428090413.38234-1-s.pueschel@pengutronix.de> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2a0a:edc0:0:900:1d::77 X-SA-Exim-Mail-From: s.pueschel@pengutronix.de X-SA-Exim-Scanned: No (on metis.whiteo.stw.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: libcamera-devel@lists.libcamera.org X-BeenThere: libcamera-devel@lists.libcamera.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libcamera-devel-bounces@lists.libcamera.org Sender: "libcamera-devel" From: Nícolas F. R. A. Prado Instead of using bufferCount as the number of V4L2 buffer slots to reserve in the vimc and uvcvideo pipeline handlers, use a reasonably high constant: 16. Overallocating isn't a problem as buffer slots are cheap. Having too few, on the other hand, could degrade performance. It is expected that this number will be more than enough for most, if not all, use cases. This makes way for removing bufferCount. Signed-off-by: Nícolas F. R. A. Prado Reviewed-by: Paul Elder Signed-off-by: Paul Elder Reviewed-by: Jacopo Mondi Signed-off-by: Sven Püschel --- Changes in v11: - rebased Changes in v9: - rebased Changes in v8: - New --- src/libcamera/pipeline/uvcvideo/uvcvideo.cpp | 5 +++-- src/libcamera/pipeline/vimc/vimc.cpp | 5 +++-- 2 files changed, 6 insertions(+), 4 deletions(-) diff --git a/src/libcamera/pipeline/uvcvideo/uvcvideo.cpp b/src/libcamera/pipeline/uvcvideo/uvcvideo.cpp index 60c82364..e1259cf3 100644 --- a/src/libcamera/pipeline/uvcvideo/uvcvideo.cpp +++ b/src/libcamera/pipeline/uvcvideo/uvcvideo.cpp @@ -109,6 +109,8 @@ private: { return static_cast(camera->_d()); } + + static constexpr unsigned int kUVCBufferSlotCount = 16; }; namespace { @@ -291,9 +293,8 @@ int PipelineHandlerUVC::exportFrameBuffers(Camera *camera, int PipelineHandlerUVC::start(Camera *camera, [[maybe_unused]] const ControlList *controls) { UVCCameraData *data = cameraData(camera); - unsigned int count = data->stream_.configuration().bufferCount; - int ret = data->video_->importBuffers(count); + int ret = data->video_->importBuffers(kUVCBufferSlotCount); if (ret < 0) return ret; diff --git a/src/libcamera/pipeline/vimc/vimc.cpp b/src/libcamera/pipeline/vimc/vimc.cpp index 8833647a..e66dbd78 100644 --- a/src/libcamera/pipeline/vimc/vimc.cpp +++ b/src/libcamera/pipeline/vimc/vimc.cpp @@ -109,6 +109,8 @@ private: { return static_cast(camera->_d()); } + + static constexpr unsigned int kVimcBufferSlotCount = 16; }; namespace { @@ -356,9 +358,8 @@ int PipelineHandlerVimc::exportFrameBuffers(Camera *camera, int PipelineHandlerVimc::start(Camera *camera, [[maybe_unused]] const ControlList *controls) { VimcCameraData *data = cameraData(camera); - unsigned int count = data->stream_.configuration().bufferCount; - int ret = data->video_->importBuffers(count); + int ret = data->video_->importBuffers(kVimcBufferSlotCount); if (ret < 0) return ret;