From patchwork Thu Sep 25 22:17:08 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hans de Goede X-Patchwork-Id: 24468 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 C502DC3333 for ; Thu, 25 Sep 2025 22:17:33 +0000 (UTC) Received: from lancelot.ideasonboard.com (localhost [IPv6:::1]) by lancelot.ideasonboard.com (Postfix) with ESMTP id F145F6B60E; Fri, 26 Sep 2025 00:17:32 +0200 (CEST) Authentication-Results: lancelot.ideasonboard.com; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="uRc9mwiv"; dkim-atps=neutral Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by lancelot.ideasonboard.com (Postfix) with ESMTPS id 007EF6B60F for ; Fri, 26 Sep 2025 00:17:20 +0200 (CEST) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id DD8264561F for ; Thu, 25 Sep 2025 22:17:19 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 12A01C4CEF7; Thu, 25 Sep 2025 22:17:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1758838639; bh=RH0Hcg13gyC2TYAJCCRxUwCSNWWjHlPrrMNTnoh9sgQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uRc9mwivHLDvzHvjUesUfLu6s1RjT0ZHWsGxRvjyH8KLFrmDqZWXuWXnecwGzXw5I ev8hvSRH0iBhGfyR7OJQVS7XJUaXUo3E5GW93cywTc52ZX02fWJGestegIE53qQWpg 7i60zURpp2cg4N2ChgeYczGzqLBI0xg47F5mQZVtGsJbFidPmvy6jwQWNepnDzNbY1 xzFl+oFuGoLdm8AyI16OLfaEyS/lpWeMCbdKkqXq+YzOIS9gOqJpeXL62w7RR9h2kX I9NI48ReGgXKDsyT4nCe+ZjIvntbTbMN8VzD4TLvCrffD5vW4Bh/K4094Mz2X/ZRt+ hAnvPSmMOwrqA== From: Hans de Goede To: libcamera-devel@lists.libcamera.org Cc: Hans de Goede Subject: [PATCH v2 6/6] libcamera: software_isp: Run sw-statistics once every 4th frame Date: Fri, 26 Sep 2025 00:17:08 +0200 Message-ID: <20250925221708.7471-7-hansg@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250925221708.7471-1-hansg@kernel.org> References: <20250925221708.7471-1-hansg@kernel.org> MIME-Version: 1.0 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" Run sw-statistics once every 4th frame, instead of every frame. There are 2 reasons for this: 1. There really is no need to have statistics for every frame and only doing this every 4th frame helps save some CPU time. 2. The generic nature of the simple pipeline-handler, so no information about possible CSI receiver frame-delays. In combination with the software ISP often being used with sensors without sensor info in the sensor-helper code, so no reliable control-delay information means that the software ISP is prone to AGC oscillation. Skipping statistics gathering also means skipping running the AGC algorithm slowing it down, avoiding this oscillation. Note ideally the AGC oscillation problem would be fixed by adding sensor metadata support all through the stack so that the exact gain and exposure used for a specific frame are reliably provided by the sensor metadata. Signed-off-by: Hans de Goede --- src/libcamera/software_isp/debayer_cpu.cpp | 25 +++++++++++++--------- src/libcamera/software_isp/debayer_cpu.h | 4 ++-- src/libcamera/software_isp/swstats_cpu.cpp | 5 +++++ src/libcamera/software_isp/swstats_cpu.h | 3 +++ 4 files changed, 25 insertions(+), 12 deletions(-) diff --git a/src/libcamera/software_isp/debayer_cpu.cpp b/src/libcamera/software_isp/debayer_cpu.cpp index bfa60888..9010333e 100644 --- a/src/libcamera/software_isp/debayer_cpu.cpp +++ b/src/libcamera/software_isp/debayer_cpu.cpp @@ -655,7 +655,7 @@ void DebayerCpu::memcpyNextLine(const uint8_t *linePointers[]) lineBufferIndex_ = (lineBufferIndex_ + 1) % (patternHeight + 1); } -void DebayerCpu::process2(const uint8_t *src, uint8_t *dst) +void DebayerCpu::process2(uint32_t frame, const uint8_t *src, uint8_t *dst) { unsigned int yEnd = window_.y + window_.height; /* Holds [0] previous- [1] current- [2] next-line */ @@ -681,7 +681,8 @@ void DebayerCpu::process2(const uint8_t *src, uint8_t *dst) for (unsigned int y = window_.y; y < yEnd; y += 2) { shiftLinePointers(linePointers, src); memcpyNextLine(linePointers); - stats_->processLine0(y, linePointers); + if (frame % SwStatsCpu::kStatPerNumFrames == 0) + stats_->processLine0(y, linePointers); (this->*debayer0_)(dst, linePointers); src += inputConfig_.stride; dst += outputConfig_.stride; @@ -696,7 +697,8 @@ void DebayerCpu::process2(const uint8_t *src, uint8_t *dst) if (window_.y == 0) { shiftLinePointers(linePointers, src); memcpyNextLine(linePointers); - stats_->processLine0(yEnd, linePointers); + if (frame % SwStatsCpu::kStatPerNumFrames == 0) + stats_->processLine0(yEnd, linePointers); (this->*debayer0_)(dst, linePointers); src += inputConfig_.stride; dst += outputConfig_.stride; @@ -710,7 +712,7 @@ void DebayerCpu::process2(const uint8_t *src, uint8_t *dst) } } -void DebayerCpu::process4(const uint8_t *src, uint8_t *dst) +void DebayerCpu::process4(uint32_t frame, const uint8_t *src, uint8_t *dst) { const unsigned int yEnd = window_.y + window_.height; /* @@ -733,7 +735,8 @@ void DebayerCpu::process4(const uint8_t *src, uint8_t *dst) for (unsigned int y = window_.y; y < yEnd; y += 4) { shiftLinePointers(linePointers, src); memcpyNextLine(linePointers); - stats_->processLine0(y, linePointers); + if (frame % SwStatsCpu::kStatPerNumFrames == 0) + stats_->processLine0(y, linePointers); (this->*debayer0_)(dst, linePointers); src += inputConfig_.stride; dst += outputConfig_.stride; @@ -746,7 +749,8 @@ void DebayerCpu::process4(const uint8_t *src, uint8_t *dst) shiftLinePointers(linePointers, src); memcpyNextLine(linePointers); - stats_->processLine2(y, linePointers); + if (frame % SwStatsCpu::kStatPerNumFrames == 0) + stats_->processLine2(y, linePointers); (this->*debayer2_)(dst, linePointers); src += inputConfig_.stride; dst += outputConfig_.stride; @@ -821,12 +825,13 @@ void DebayerCpu::process(uint32_t frame, FrameBuffer *input, FrameBuffer *output return; } - stats_->startFrame(); + if (frame % SwStatsCpu::kStatPerNumFrames == 0) + stats_->startFrame(); if (inputConfig_.patternSize.height == 2) - process2(in.planes()[0].data(), out.planes()[0].data()); + process2(frame, in.planes()[0].data(), out.planes()[0].data()); else - process4(in.planes()[0].data(), out.planes()[0].data()); + process4(frame, in.planes()[0].data(), out.planes()[0].data()); metadata.planes()[0].bytesused = out.planes()[0].size(); @@ -851,7 +856,7 @@ void DebayerCpu::process(uint32_t frame, FrameBuffer *input, FrameBuffer *output * * \todo Pass real bufferId once stats buffer passing is changed. */ - stats_->finishFrame(frame, 0, true); + stats_->finishFrame(frame, 0, frame % SwStatsCpu::kStatPerNumFrames == 0); outputBufferReady.emit(output); inputBufferReady.emit(input); } diff --git a/src/libcamera/software_isp/debayer_cpu.h b/src/libcamera/software_isp/debayer_cpu.h index 9d343e46..03e0d784 100644 --- a/src/libcamera/software_isp/debayer_cpu.h +++ b/src/libcamera/software_isp/debayer_cpu.h @@ -133,8 +133,8 @@ private: void setupInputMemcpy(const uint8_t *linePointers[]); void shiftLinePointers(const uint8_t *linePointers[], const uint8_t *src); void memcpyNextLine(const uint8_t *linePointers[]); - void process2(const uint8_t *src, uint8_t *dst); - void process4(const uint8_t *src, uint8_t *dst); + void process2(uint32_t frame, const uint8_t *src, uint8_t *dst); + void process4(uint32_t frame, const uint8_t *src, uint8_t *dst); /* Max. supported Bayer pattern height is 4, debayering this requires 5 lines */ static constexpr unsigned int kMaxLineBuffers = 5; diff --git a/src/libcamera/software_isp/swstats_cpu.cpp b/src/libcamera/software_isp/swstats_cpu.cpp index da91f912..35ba0a46 100644 --- a/src/libcamera/software_isp/swstats_cpu.cpp +++ b/src/libcamera/software_isp/swstats_cpu.cpp @@ -89,6 +89,11 @@ namespace libcamera { * \brief Signals that the statistics are ready */ +/** + * \var SwStatsCpu::kStatPerNumFrames + * \brief Run stats once every kStatPerNumFrames frames + */ + /** * \typedef SwStatsCpu::statsProcessFn * \brief Called when there is data to get statistics from diff --git a/src/libcamera/software_isp/swstats_cpu.h b/src/libcamera/software_isp/swstats_cpu.h index 6ac3c4de..ea0e6d5a 100644 --- a/src/libcamera/software_isp/swstats_cpu.h +++ b/src/libcamera/software_isp/swstats_cpu.h @@ -32,6 +32,9 @@ public: SwStatsCpu(); ~SwStatsCpu() = default; + /* Run stats once every 4 frames */ + static constexpr uint32_t kStatPerNumFrames = 4; + bool isValid() const { return sharedStats_.fd().isValid(); } const SharedFD &getStatsFD() { return sharedStats_.fd(); }