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Project: /youtube/cobalt/_project.yaml | ||
Book: /youtube/cobalt/_book.yaml | ||
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## Cobalt 25.LTS.10 Stable Release | ||
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The Cobalt team is thrilled to announce the stable release of **Cobalt 25 LTS | ||
([25.lts.10.1034827](https://github.com/youtube/cobalt/tree/25.lts.10))** | ||
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The Evergreen binaries are available on GitHub | ||
([5.10.2](https://github.com/youtube/cobalt/releases/tag/25.lts.10)) | ||
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Cobalt 25 LTS includes **Starboard API version 16** for porters and this stable | ||
release version supports all features that are required for **2025 YouTube | ||
Certification**. The code is available at Cobalt open source | ||
**[25.lts.10](https://github.com/youtube/cobalt/tree/25.lts.10)** branch. | ||
(Read | ||
[branching](https://github.com/youtube/cobalt/blob/25.lts.10/cobalt/site/docs/gen/cobalt/doc/branching.md) | ||
and | ||
[versioning](https://github.com/youtube/cobalt/blob/25.lts.10/cobalt/site/docs/gen/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 with a brief description of **Cobalt 25 LTS** and | ||
**Starboard 16** changes. | ||
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### Cobalt Changes | ||
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(see[ | ||
cobalt/CHANGELOG.md](https://github.com/youtube/cobalt/blob/25.lts.10/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. | ||
* **HTTP/3 with IETF QUIC:** Integrated HTTP/3 with IETF standard QUIC for | ||
enhanced video playback performance in challenging network conditions. | ||
* **Immersive Audio Model and Formats (IAMF):** Added support for IAMF audio. | ||
* **Android U Support:** Extended compatibility to Android U | ||
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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. | ||
* **Logging and Telemetry Enhancements:** Improved logging and telemetry for | ||
update reliability and crash reporting. | ||
* **Critical Stability fixes** : Bug fixes and stability | ||
[improvements](https://github.com/youtube/cobalt/compare/25.lts.1...25.lts.10). | ||
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#### Evergreen | ||
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* **LZ4 Compressed Binaries:** Made LZ4 compressed binaries the default | ||
distribution format. | ||
* **Evergreen-Full on AOSP:** Enabled Evergreen-Full support on AOSP (Android | ||
Open Source). | ||
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### Starboard Changes | ||
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(see | ||
[starboard/CHANGELOG.md](https://github.com/youtube/cobalt/blob/25.lts.10/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](https://github.com/youtube/cobalt/blob/25.lts.10/starboard/doc/starboard_16_posix.md) | ||
for details), reducing the total number of Starboard interface functions to | ||
191 (vs 274 in Starboard 15). | ||
* **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. | ||
* **Memory and File System Migration:** Migrated memory allocation functions | ||
(`SbMemoryAllocate`, `SbMemoryMap` and others) to `malloc`, `mmap` and file | ||
system functions (`SbDirectoryOpen`, `SbDirectoryClose` and others) to | ||
equivalent `opendir`, `closedir`. | ||
* **Socket API Migration:** Migrated `SbSocket` to socket APIs. | ||
* **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). | ||
* **Build Standard Upgrade:** Upgraded the C build standard to C11. | ||
* Removed `SB_C_NOINLINE`. | ||
* Deprecated `SB_C_INLINE` and removed config for `SB_C_FORCE_INLINE`. | ||
* Removed configs for `SB_EXPORT_PLATFORM` and `SB_IMPORT_PLATFORM`. | ||
* **Configuration Changes:** | ||
* Changed `MAP_EXECUTABLE_MEMORY` from build-time to runtime config | ||
(`kSbCanMapExecutableMemory`). | ||
* **Additional Migrations:** Migrated `SbDirectoryCanOpen`, `SbFileExists`, | ||
and `SbFileGetPathInfo` to `start` , 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. | ||
* **OnScreenKeyboard:** Deprecated OnScreenKeyboard. | ||
* **Unused Configurations:** Deprecated various unused configurations (e.g., | ||
`B_HAS_GLES2`, `SB_HAS_NV12_TEXTURE_SUPPORT`, `VIRTUAL_REALITY`, | ||
`DeployPathPatterns`, `SPEECH_SYNTHESIS`, `FILESYSTEM_ZERO_FILEINFO_TIME`, | ||
`SB_HAS_PIPE`). | ||
* **Audio and Media:** | ||
* Deprecated SB_HAS_QUIRK(SUPPORT_INT16_AUDIO_SAMPLES). | ||
* Deprecated `SbMediaGetBufferAlignment`, `SbMediaGetBufferPadding` and | ||
`SbMediaGetBufferStorageType`. | ||
* Deprecated `SbMediaIsBufferUsingMemoryPool`, and memory pool is always | ||
used. (`SbMediaIsBufferUsingMemoryPool` is required to be true) | ||
* **Starboard Hash Configs:** Deprecated Starboard hash configs. | ||
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### 2025 YouTube Certification | ||
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Remember to use "_25.lts.10_" 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](https://developers.google.com/youtube/devices/living-room/support/cobalt-known-issues). | ||
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### Contact Points | ||
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Contact our [support channels](https://cobalt.dev/communication.html) if | ||
you have any problems, questions, or feedback. |
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