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| Project: /youtube/cobalt/_project.yaml | ||
| Book: /youtube/cobalt/_book.yaml | ||
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| # [Jul 1st 2024] Cobalt 25.LTS.1 Release Candidate | ||
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| ## [Cobalt 25.lts.1 Release](https://developers.google.com/youtube/devices/living-room/cobalt/cobalt-evergreen-version-table) | ||
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| The Cobalt team is thrilled to announce the RC (Release Candidate) of [Cobalt 25 | ||
| LTS 1](https://github.com/youtube/cobalt/releases/tag/25.lts.1) ! | ||
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| Evergreen binaries are available on GitHub | ||
| ([5.1.2](https://github.com/youtube/cobalt/releases/tag/25.lts.1)) | ||
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| Cobalt 25 LTS includes Starboard API version 16 for porters and its Stable | ||
| release version will support all features that are required for 2025 YouTube | ||
| Certification. The code is available at Cobalt open source | ||
| [25.lts.1+](https://github.com/youtube/cobalt/releases/tag/25.lts.1) branch. | ||
| Read | ||
| [branching](https://github.com/youtube/cobalt/blob/25.lts.1/cobalt/doc/branching.md) | ||
| / | ||
| [versioning](https://github.com/youtube/cobalt/blob/25.lts.1/cobalt/doc/versioning.md) | ||
| documents for more information. | ||
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| There are newly implemented features, improvements, and simplified code. We have | ||
| outlined the changelist below with a brief description of Cobalt 25 LTS and | ||
| Starboard 16 changes. | ||
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| IMPORTANT NOTE: As this version is a RC (Release Candidate), the code is | ||
| subject to change while we expect to have no more Starboard API changes. | ||
| **This is ready for integration and we STRONGLY RECOMMEND you start integration | ||
| of this Cobalt 25 LTS RC on your respective platforms early and report issues | ||
| ASAP** so there is ample time to investigate and resolve any detected issues | ||
| before Cobalt 25 LTS Stable Release later this year. | ||
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| The Evergreen static version channels command (`co 25lts1`) can be used to | ||
| update builds to the `25.LTS.1` Cobalt version for testing by following the | ||
| steps provided | ||
| [here](https://developers.google.com/youtube/devices/living-room/cobalt/cobalt-evergreen-faq). | ||
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| ## Cobalt Changes | ||
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| [Full change log](https://github.com/youtube/cobalt/blob/25.lts.1/cobalt/CHANGELOG.md) | ||
| for more information. | ||
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| ### New Features / Support | ||
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| * **Chromium M114 Update:** Upgraded most Chromium components to align with | ||
| the M114 milestone release - including syncing the build environment and | ||
| compilers. | ||
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| * **HTTP/3 with IETF QUIC:** Integrated HTTP/3 with IETF standard QUIC for | ||
| enhance video playback performance in challenging network conditions. | ||
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| * **Immersive Audio Model and Formats (IAMF):** Added support for IAMF audio. | ||
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| * **Android S Support:** Extended compatibility to Android S. | ||
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| ### Updates / Improvements | ||
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| * **Embedded ICU Data:** Linked ICU data directly into the Cobalt binary, | ||
| reducing storage (via binary compression) and simplifying updates. | ||
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| * **Logging and Telemetry Enhancements:** Improved logging and telemetry for | ||
| update reliability and crash reporting. | ||
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| ### Evergreen | ||
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| * **LZ4 Compressed Binaries:** Made LZ4 compressed binaries the default | ||
| distribution format. | ||
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| * **Evergreen-Full on AOSP:** Enabled Evergreen-Full support on AOSP (Android | ||
| Open Source). | ||
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| ## Starboard changes | ||
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| [Full change log](https://github.com/youtube/cobalt/blob/25.lts.1/starboard/CHANGELOG.md) | ||
| for more information. | ||
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| ### New Features / Support | ||
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| * **POSIX API Adoption:** Adopted POSIX APIs (see migration guide for | ||
| details), reducing the total number of Starboard interface functions to 191 | ||
| (vs 274 in Starboard 15). | ||
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| * **Partial Audio Frame Support:** Introduced a new configuration constant | ||
| (`kHasPartialAudioFramesSupport`) for partial audio frames. | ||
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| ### Updates / Improvements | ||
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| * **pthread Migration:** Migrated various components (e g., | ||
| `SbConditionVariable`, `SbOnce`, `SbThreadLocalKey`, etc…) to pthread. | ||
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| * **Memory and File System Migration:** Migrated memory allocation functions | ||
| (`SbMemoryAllocate`, `SbMemoryMap` etc…) to `malloc`, `mmap` and file system | ||
| functions (`SbDirectoryOpen` or `SbDirectoryClose` for example) to | ||
| equivalent `opendir`, `closedir`, etc.. | ||
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| * **Socket API Migration:** Migrated `SbSocket` to socket APIs. | ||
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| * **Starboard Extensions :** `Accessibility` and `OnScreenKeyboard` Starboard | ||
| APIs are converted to Starboard Extensions (available in | ||
| `starboard/extension/accessibility.h` and | ||
| `starboard/extension on_screen_keyboard.h` respectively). | ||
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| * **Build Standard Upgrade:** Upgraded the C build standard to C11. | ||
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| * Removed `SB_C_NOINLINE`. | ||
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| * Deprecated `SB_C_INLINE` and removed config for `SB_C_FORCE_INLINE`. | ||
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| * Removed configs for `SB_EXPORT_PLATFORM` and `SB_IMPORT_PLATFORM`. | ||
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| * **Configuration Changes:** | ||
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| * Changed `MAP_EXECUTABLE_MEMORY` from build-time to runtime config | ||
| (`kSbCanMapExecutableMemory`). | ||
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| * **Additional Migrations:** Migrated `SbDirectoryCanOpen`, `SbFileExists`, | ||
| and `SbFileGetPathInfo` to `stat` , and `SbFileOpen`, `SbFileClose` to | ||
| `open`, `close`. | ||
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| ### Deprecations | ||
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| * **Deprecated Evergreen-x86 ABI:** The x86 platform configurations, builds | ||
| and ABI are no longer supported for Evergreen. | ||
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| * **OnScreenKeyboard:** Deprecated `OnScreenKeyboard`. | ||
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| * **Unused Configurations:** Deprecated various unused configurations (e.g., | ||
| `SB_HAS_GLES2`, `SB_HAS_NV12_TEXTURE_SUPPORT`, `VIRTUAL_REALITY`, | ||
| `DeployPathPatterns`, `SPEECH_SYNTHESIS`, `FILESYSTEM_ZERO_FILEINFO_TIME`, | ||
| `SB_HAS_PIPE`). | ||
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| * **Audio and Media:** | ||
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| * Deprecated `SB_HAS_QU` (`SUPPORT_INT16_AUDIO_SAMPLES`). | ||
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| * Deprecated `SbMediaGetBufferAlignment`, `SbMediaGetBufferPadding`, and | ||
| `SbMediaGetBufferStorageType`. | ||
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| * Deprecated `SbMediaIsBufferUsingMemoryPool`, memory pool is always used | ||
| (`SbMediaIsBufferUsingMemoryPool` is required to be true). | ||
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| * **Starboard Hash Configs:** Deprecated Starboard hash configs. | ||
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| ## *2025 YouTube Certification* | ||
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| Remember to use `25.lts.stable` for the 2025 YouTube certification and for your | ||
| product release. Cobalt Known Issues with Status, Fixes, and Mitigations can be | ||
| found in the YouTube Partner Portal. | ||
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| ## *Contact Points* | ||
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| Please contact our support channels if you have any problems, questions, or | ||
| feedback. | ||
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| Thank you,\ | ||
| On behalf of the Cobalt team |