xbmc/xbmc
Mar 2024 – Feb 2026
18 Months active
Languages Used
C++Objective-CMakefilecmakepythonPO
Technical Skills
C++ developmentsoftware architecturevideo processingAPI designAlgorithm OptimizationC++
Markus Härer
PROFILE
Markus Härer
Markus Haerer contributed to the xbmc/xbmc repository over 18 months, delivering 46 features and 26 bug fixes focused on performance, reliability, and maintainability. He modernized core components such as StringUtils and DNS caching, introduced compile-time data structures, and enhanced video playback continuity. Using C++ and cmake, Markus refactored APIs for safety and efficiency, implemented thread-safe audio and job management, and improved cross-platform support for Wayland and PipeWire. His work included robust error handling, memory optimization, and expanded test coverage, resulting in a more stable codebase with lower runtime overhead and improved user experience across media playback and UI.
Overall Statistics
Feature vs Bugs
64%Features
Repository Contributions
169Total
Bugs
26
Commits
169
Features
46
Lines of code
1,626,096
Activity Months18
Your Network
102 peopleShared Repositories
102
Work History
February 2026
1 Commits
Feb 1, 2026February 2026: Delivered a critical deadlock prevention fix in JobManager for the xbmc/xbmc repository. This work stabilized multithreaded job handling by leveraging std::optional and std::atomic to manage job callbacks and pending counts, reducing the risk of deadlocks during OnJobComplete.
1 Commits
Feb 1, 2026February 2026: Delivered a critical deadlock prevention fix in JobManager for the xbmc/xbmc repository. This work stabilized multithreaded job handling by leveraging std::optional and std::atomic to manage job callbacks and pending counts, reducing the risk of deadlocks during OnJobComplete.
February 2026
January 2026
5 Commits • 2 Features
Jan 1, 2026January 2026 monthly summary for xbmc/xbmc: Focused on reliability, UI consistency, and localization accuracy. Key features delivered include subtitle handling reliability improvements and caption parsing refactor for memory safety, UI interaction enhancements, and a localization bug fix. These changes improve end-user experience by reducing subtitle desync, ensuring more consistent UI during animations, and correcting English (GB) translations. Demonstrates strong memory-safety practices, platform-specific input handling (Wayland), and internationalization support, aligning with business value of stable media playback and international user satisfaction.
January 2026
5 Commits • 2 Features
Jan 1, 2026January 2026 monthly summary for xbmc/xbmc: Focused on reliability, UI consistency, and localization accuracy. Key features delivered include subtitle handling reliability improvements and caption parsing refactor for memory safety, UI interaction enhancements, and a localization bug fix. These changes improve end-user experience by reducing subtitle desync, ensuring more consistent UI during animations, and correcting English (GB) translations. Demonstrates strong memory-safety practices, platform-specific input handling (Wayland), and internationalization support, aligning with business value of stable media playback and international user satisfaction.
December 2025
9 Commits • 2 Features
Dec 1, 2025December 2025 monthly summary for repository xbmc/xbmc. Key features delivered include dynamic PipeWire audio node property handling with real-time tracking of formats, sample rates, channels and codecs, automatic update of formats in response to PipeWire signals, and device-change notifications to the system. This work also automated format enumeration on property changes and simplified internal state inspection with a HasInfo helper and a leaner CPipewireNode::Info(). In parallel, UI/UX improvements to the file browser were delivered, featuring a busy progress dialog during directory fetch and a dedicated VirtualDirectory component to centralize directory item retrieval logic. A rollback was performed on CPipewireRegistry locking to address potential race conditions; this will require a follow-up thread-safety review. Overall impact: stronger audio pipeline resilience, more responsive format negotiation, safer registry access, and improved file navigation UX, contributing to reduced manual tuning and faster content access.
9 Commits • 2 Features
Dec 1, 2025December 2025 monthly summary for repository xbmc/xbmc. Key features delivered include dynamic PipeWire audio node property handling with real-time tracking of formats, sample rates, channels and codecs, automatic update of formats in response to PipeWire signals, and device-change notifications to the system. This work also automated format enumeration on property changes and simplified internal state inspection with a HasInfo helper and a leaner CPipewireNode::Info(). In parallel, UI/UX improvements to the file browser were delivered, featuring a busy progress dialog during directory fetch and a dedicated VirtualDirectory component to centralize directory item retrieval logic. A rollback was performed on CPipewireRegistry locking to address potential race conditions; this will require a follow-up thread-safety review. Overall impact: stronger audio pipeline resilience, more responsive format negotiation, safer registry access, and improved file navigation UX, contributing to reduced manual tuning and faster content access.
December 2025
November 2025
9 Commits • 1 Features
Nov 1, 2025November 2025 monthly summary for xbmc/xbmc focusing on performance improvements in the GUI rendering pipeline and stability fixes that reduce allocations and improve robustness. Key features delivered - GUI Font Rendering and Text Layout Performance Improvements: Consolidated performance and memory optimizations across GUI font rendering and text layout. Migrated APIs to std::span-based usage across GUIFont, GUITextLayout, and GUIFontCache, which reduced allocations and copies. Optimized font cache, streamlined text rendering, improved text wrapping, introduced reusable map nodes, refined container choices for transforms, and implemented direct color handling to minimize temporary allocations. Commit history highlights include: 14f470abe21ff0bac5053ede554e77976b2ec595; d1cdc56d29b7edb13ccdb5bead4281a3956865de; b9e1fb16018aa517fda0a58e1190205509f56dcf; 4191a201f98f0ffb6cd0451f40bf4ea594dab127; 8ad2cffb1efcc61fdc45081c0f3b2f85c3615d1a; fa5c2daf00862d621db001f38d45dcb2b4e1d545; 2ebb9db10cf36730847b3d87ef25059320f62972; 44f3c879aec25a4ff3645c6ac037db893782acb5. - GetFileOrFolderName Empty Input Handling: Fixed to return an empty string for empty input to prevent errors in path processing. Commit: c76ac0feeb2c66f3190c981da891a41296fa8663. - GraphicalContext and frame transforms optimization: Switched to a std::stack backed by a std::vector for per-frame m_transforms to avoid constant allocations/deallocations and improve frame-time stability. (Descriptor: use of stack with vector to manage transforms efficiently.) Major bugs fixed - GetFileOrFolderName now safely handles empty input by returning an empty string, preventing downstream errors in path processing. Overall impact and accomplishments - UI responsiveness and stability improved due to reduced allocations and copies in the rendering path. - Memory footprint lowered in GUI font rendering and layout, enabling smoother frame times on typical hardware. - More robust behavior for edge cases (empty input paths) and a more maintainable codebase through span-based APIs and smaller copy/alloc footprint. Technologies/skills demonstrated - Modern C++: std::span, std::vector, std::stack, and careful container choice to minimize allocations. - Performance optimization: memory reuse, cache key design changes, and API refactoring to reduce allocations and copies. - API design and maintainability: adopting span-based interfaces for safer, zero-copy data access. - Code quality: targeted refactors with clear commit messages and incremental improvements. Business value - Faster UI rendering reduces perceived latency for end users, improving satisfaction in media browsing and playback flows. - Reduced memory churn leads to more stable performance on mid-range hardware. - Robust input handling reduces risk of crashes or misbehavior when processing file paths in libraries and addons.
November 2025
9 Commits • 1 Features
Nov 1, 2025November 2025 monthly summary for xbmc/xbmc focusing on performance improvements in the GUI rendering pipeline and stability fixes that reduce allocations and improve robustness. Key features delivered - GUI Font Rendering and Text Layout Performance Improvements: Consolidated performance and memory optimizations across GUI font rendering and text layout. Migrated APIs to std::span-based usage across GUIFont, GUITextLayout, and GUIFontCache, which reduced allocations and copies. Optimized font cache, streamlined text rendering, improved text wrapping, introduced reusable map nodes, refined container choices for transforms, and implemented direct color handling to minimize temporary allocations. Commit history highlights include: 14f470abe21ff0bac5053ede554e77976b2ec595; d1cdc56d29b7edb13ccdb5bead4281a3956865de; b9e1fb16018aa517fda0a58e1190205509f56dcf; 4191a201f98f0ffb6cd0451f40bf4ea594dab127; 8ad2cffb1efcc61fdc45081c0f3b2f85c3615d1a; fa5c2daf00862d621db001f38d45dcb2b4e1d545; 2ebb9db10cf36730847b3d87ef25059320f62972; 44f3c879aec25a4ff3645c6ac037db893782acb5. - GetFileOrFolderName Empty Input Handling: Fixed to return an empty string for empty input to prevent errors in path processing. Commit: c76ac0feeb2c66f3190c981da891a41296fa8663. - GraphicalContext and frame transforms optimization: Switched to a std::stack backed by a std::vector for per-frame m_transforms to avoid constant allocations/deallocations and improve frame-time stability. (Descriptor: use of stack with vector to manage transforms efficiently.) Major bugs fixed - GetFileOrFolderName now safely handles empty input by returning an empty string, preventing downstream errors in path processing. Overall impact and accomplishments - UI responsiveness and stability improved due to reduced allocations and copies in the rendering path. - Memory footprint lowered in GUI font rendering and layout, enabling smoother frame times on typical hardware. - More robust behavior for edge cases (empty input paths) and a more maintainable codebase through span-based APIs and smaller copy/alloc footprint. Technologies/skills demonstrated - Modern C++: std::span, std::vector, std::stack, and careful container choice to minimize allocations. - Performance optimization: memory reuse, cache key design changes, and API refactoring to reduce allocations and copies. - API design and maintainability: adopting span-based interfaces for safer, zero-copy data access. - Code quality: targeted refactors with clear commit messages and incremental improvements. Business value - Faster UI rendering reduces perceived latency for end users, improving satisfaction in media browsing and playback flows. - Reduced memory churn leads to more stable performance on mid-range hardware. - Robust input handling reduces risk of crashes or misbehavior when processing file paths in libraries and addons.
October 2025
1 Commits
Oct 1, 2025October 2025 monthly summary for xbmc/xbmc focused on stabilization of DRM initialization and EGL fence handling, with an emphasis on reliability and startup robustness that translates to improved user experience and reduced post-release defects.
1 Commits
Oct 1, 2025October 2025 monthly summary for xbmc/xbmc focused on stabilization of DRM initialization and EGL fence handling, with an emphasis on reliability and startup robustness that translates to improved user experience and reduced post-release defects.
October 2025
September 2025
10 Commits • 3 Features
Sep 1, 2025September 2025 (xbmc/xbmc) — Delivered data-structure and encoding improvements that reduce runtime overhead, improve correctness, and strengthen dependency management. Key performance-oriented refactors and tests align with business goals of faster startup, lower memory usage, and safer code paths.
September 2025
10 Commits • 3 Features
Sep 1, 2025September 2025 (xbmc/xbmc) — Delivered data-structure and encoding improvements that reduce runtime overhead, improve correctness, and strengthen dependency management. Key performance-oriented refactors and tests align with business goals of faster startup, lower memory usage, and safer code paths.
August 2025
26 Commits • 13 Features
Aug 1, 2025In August 2025, delivered substantial Wayland color management integration and core data-structure modernization that improves user experience on Wayland, reduces runtime overhead, and enhances maintainability across the codebase. Highlights include protocol support, safe compositor handling, widespread refactors to constexpr CMap across core modules, and build-system readiness for protocol-aware builds.
26 Commits • 13 Features
Aug 1, 2025In August 2025, delivered substantial Wayland color management integration and core data-structure modernization that improves user experience on Wayland, reduces runtime overhead, and enhances maintainability across the codebase. Highlights include protocol support, safe compositor handling, widespread refactors to constexpr CMap across core modules, and build-system readiness for protocol-aware builds.
August 2025
June 2025
2 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary for xbmc/xbmc focusing on performance optimization through string handling improvements in URL parsing and dataset queries. Delivered refactors that replace string allocations with std::string::clear() and std::string_view, and removed redundant strlen calls, reducing CPU overhead and memory churn. No user-facing feature changes; the work enhances throughput for URL processing and dataset querying and lays groundwork for further performance improvements. Business value: faster parsing, lower resource usage, and more scalable data handling.
June 2025
2 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary for xbmc/xbmc focusing on performance optimization through string handling improvements in URL parsing and dataset queries. Delivered refactors that replace string allocations with std::string::clear() and std::string_view, and removed redundant strlen calls, reducing CPU overhead and memory churn. No user-facing feature changes; the work enhances throughput for URL processing and dataset querying and lays groundwork for further performance improvements. Business value: faster parsing, lower resource usage, and more scalable data handling.
May 2025
14 Commits • 5 Features
May 1, 2025In May 2025, xbmc/xbmc delivered focused performance and reliability improvements across logging, input handling, keymapping, image format detection, and rendering checks. These changes reduce runtime overhead, prevent conflicts, and improve media handling accuracy, delivering tangible business value through faster, more stable builds and cleaner code paths.
14 Commits • 5 Features
May 1, 2025In May 2025, xbmc/xbmc delivered focused performance and reliability improvements across logging, input handling, keymapping, image format detection, and rendering checks. These changes reduce runtime overhead, prevent conflicts, and improve media handling accuracy, delivering tangible business value through faster, more stable builds and cleaner code paths.
May 2025
April 2025
8 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for repository xbmc/xbmc focused on stabilizing UI rendering, centralizing GL feature detection, and improving code quality through tests and const-correctness improvements. Key outcomes include a centralized OpenGL extensions utility, fixes to GUI rendering order preventing visual glitches, and strengthened robustness of string utilities with expanded test coverage and const-correctness improvements.
April 2025
8 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for repository xbmc/xbmc focused on stabilizing UI rendering, centralizing GL feature detection, and improving code quality through tests and const-correctness improvements. Key outcomes include a centralized OpenGL extensions utility, fixes to GUI rendering order preventing visual glitches, and strengthened robustness of string utilities with expanded test coverage and const-correctness improvements.
March 2025
7 Commits • 1 Features
Mar 1, 2025March 2025 (xbmc/xbmc) - Key features delivered and bugs fixed with measurable performance and reliability impact. Implemented DNS Name Cache modernization with TTL-based expiry and centralized management; corrected time calculations using std::chrono; fixed ConstNullVariant immutability in swap. Resulting improvements include lower access latency, more accurate scheduling, enhanced data integrity, and better test coverage, with documentation updates.
7 Commits • 1 Features
Mar 1, 2025March 2025 (xbmc/xbmc) - Key features delivered and bugs fixed with measurable performance and reliability impact. Implemented DNS Name Cache modernization with TTL-based expiry and centralized management; corrected time calculations using std::chrono; fixed ConstNullVariant immutability in swap. Resulting improvements include lower access latency, more accurate scheduling, enhanced data integrity, and better test coverage, with documentation updates.
March 2025
February 2025
1 Commits
Feb 1, 2025February 2025 monthly summary for xbmc/xbmc: Focused on stabilizing the PipeWire audio sink integration. Implemented a thread-safety fix in CPipewireRegistry to prevent race conditions during audio device enumeration, improving reliability of audio path initialization and runtime behavior across platforms. This work leverages a simple locking strategy to ensure atomic registry operations, reducing intermittent audio failures and crashes related to concurrent access.
February 2025
1 Commits
Feb 1, 2025February 2025 monthly summary for xbmc/xbmc: Focused on stabilizing the PipeWire audio sink integration. Implemented a thread-safety fix in CPipewireRegistry to prevent race conditions during audio device enumeration, improving reliability of audio path initialization and runtime behavior across platforms. This work leverages a simple locking strategy to ensure atomic registry operations, reducing intermittent audio failures and crashes related to concurrent access.
January 2025
7 Commits
Jan 1, 2025January 2025 monthly summary for repository xbmc/xbmc focusing on stability, correctness, and cross-platform packaging across core components. Delivered targeted fixes and portability improvements with measurable impact on reliability and maintainability.
7 Commits
Jan 1, 2025January 2025 monthly summary for repository xbmc/xbmc focusing on stability, correctness, and cross-platform packaging across core components. Delivered targeted fixes and portability improvements with measurable impact on reliability and maintainability.
January 2025
December 2024
11 Commits • 3 Features
Dec 1, 2024December 2024 Monthly Summary for xbmc/xbmc: Focused on delivering user-value features, improving performance, and strengthening build stability.
December 2024
11 Commits • 3 Features
Dec 1, 2024December 2024 Monthly Summary for xbmc/xbmc: Focused on delivering user-value features, improving performance, and strengthening build stability.
November 2024
8 Commits • 3 Features
Nov 1, 2024Concise monthly summary for 2024-11 focusing on xbmc/xbmc. Highlights reliability and cross-platform improvements, cross-windowing support, and code quality. Key contributions: - Wayland window resizing bug fix: corrected how resolution and scaling factors are passed in XBMC_ResizeEvent to prevent doubling at >100% scaling. - Window resizing and scaling improvements: introduced dynamic scaling in XBMC_ResizeEvent, added across multiple windowing systems, renamed fields for clarity (width/height) and ensured correct resized dimensions with scaling. - Robust file I/O and ReadLine improvements: refactored ReadString to ReadLine, migrated to std::string, and added ReadLine/ReadLineRaw tests for reliability and error handling. - Code quality and maintenance: added [[nodiscard]] to MillisecondsToTimeString and updated TagLib usage for compatibility with major version 2.0. Business value and impact: - Improved user experience on Wayland and other windowing backends with predictable resizing and scaling. - Reduced risk and maintenance burden through clearer APIs, better test coverage, and modernization of file I/O paths. - Enabled smoother future feature work (dynamic scaling support, cross-platform consistency) with safer APIs and reduced deprecation noise. Technologies/skills demonstrated: - C/C++ windowing integration, Wayland backend fixes, cross-platform event handling - API design and refactoring (XBMC_ResizeEvent: width, height, scaling) - Modern C++ practices (std::string, [[nodiscard]], test-driven changes) - Code quality and test coverage enhancements (ReadLine tests, TagLib deprecation fixes)
8 Commits • 3 Features
Nov 1, 2024Concise monthly summary for 2024-11 focusing on xbmc/xbmc. Highlights reliability and cross-platform improvements, cross-windowing support, and code quality. Key contributions: - Wayland window resizing bug fix: corrected how resolution and scaling factors are passed in XBMC_ResizeEvent to prevent doubling at >100% scaling. - Window resizing and scaling improvements: introduced dynamic scaling in XBMC_ResizeEvent, added across multiple windowing systems, renamed fields for clarity (width/height) and ensured correct resized dimensions with scaling. - Robust file I/O and ReadLine improvements: refactored ReadString to ReadLine, migrated to std::string, and added ReadLine/ReadLineRaw tests for reliability and error handling. - Code quality and maintenance: added [[nodiscard]] to MillisecondsToTimeString and updated TagLib usage for compatibility with major version 2.0. Business value and impact: - Improved user experience on Wayland and other windowing backends with predictable resizing and scaling. - Reduced risk and maintenance burden through clearer APIs, better test coverage, and modernization of file I/O paths. - Enabled smoother future feature work (dynamic scaling support, cross-platform consistency) with safer APIs and reduced deprecation noise. Technologies/skills demonstrated: - C/C++ windowing integration, Wayland backend fixes, cross-platform event handling - API design and refactoring (XBMC_ResizeEvent: width, height, scaling) - Modern C++ practices (std::string, [[nodiscard]], test-driven changes) - Code quality and test coverage enhancements (ReadLine tests, TagLib deprecation fixes)
November 2024
August 2024
27 Commits • 8 Features
Aug 1, 2024August 2024 monthly summary for xbmc/xbmc focusing on API safety and StringUtils modernization. Delivered extensive API hardening, safety improvements, and test coverage across core string utilities. Highlights include adding [[nodiscard]] contracts to key APIs, introducing isasciiletter, broad modernization of word/matching utilities, fuzzy comparison, date-related and formatting utilities, and comprehensive API modernization (Paramify/DeParamify, Tokenize, and converters) with safety (noexcept) enhancements. Fixed critical edge cases in NumberFromSS and corrected AlphaNumericCompare usage; expanded test coverage for StringUtils.
August 2024
27 Commits • 8 Features
Aug 1, 2024August 2024 monthly summary for xbmc/xbmc focusing on API safety and StringUtils modernization. Delivered extensive API hardening, safety improvements, and test coverage across core string utilities. Highlights include adding [[nodiscard]] contracts to key APIs, introducing isasciiletter, broad modernization of word/matching utilities, fuzzy comparison, date-related and formatting utilities, and comprehensive API modernization (Paramify/DeParamify, Tokenize, and converters) with safety (noexcept) enhancements. Fixed critical edge cases in NumberFromSS and corrected AlphaNumericCompare usage; expanded test coverage for StringUtils.
July 2024
22 Commits • 2 Features
Jul 1, 2024July 2024 — xbmc/xbmc: Major StringUtils modernization and API robustness enhancements. Delivered a comprehensive modernization across StringUtils APIs, paired with targeted safety/robustness improvements. Result: safer, faster, and more maintainable string utilities used across core components and extensions.
22 Commits • 2 Features
Jul 1, 2024July 2024 — xbmc/xbmc: Major StringUtils modernization and API robustness enhancements. Delivered a comprehensive modernization across StringUtils APIs, paired with targeted safety/robustness improvements. Result: safer, faster, and more maintainable string utilities used across core components and extensions.
July 2024
March 2024
1 Commits • 1 Features
Mar 1, 2024In 2024-03, delivered a key feature for xbmc/xbmc that enhances video playback continuity by importing watched state and resume point from AS.xml into VideoInfoScanner. This reduces manual seeking and improves resume accuracy, elevating the user experience. The work was implemented via commit 1bec3c3a756335b2fd2f12338ee0e27b34b58d89 in the VideoInfoScanner path. No other major bug fixes were recorded this month.
March 2024
1 Commits • 1 Features
Mar 1, 2024In 2024-03, delivered a key feature for xbmc/xbmc that enhances video playback continuity by importing watched state and resume point from AS.xml into VideoInfoScanner. This reduces manual seeking and improves resume accuracy, elevating the user experience. The work was implemented via commit 1bec3c3a756335b2fd2f12338ee0e27b34b58d89 in the VideoInfoScanner path. No other major bug fixes were recorded this month.
Activity
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Quality Metrics
Correctness95.4%
Maintainability93.2%
Architecture91.6%
Performance91.6%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++MakefileObjective-CPOcmakepython
Technical Skills
API designAlgorithm DesignAlgorithm OptimizationAnimation HandlingAudio EngineeringAudio processingBug FixingBuild SystemsC++C++ DevelopmentC++ Standard LibraryC++ developmentC++ programmingCache ManagementCaching
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline