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tools/webrtc-custom-ios/README.md

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+# Custom WebRTC for Rosetta iOS (Audio E2EE Timestamp)
+
+This setup builds a custom `WebRTC.xcframework` for iOS and patches audio E2EE so
+`FrameEncryptor/FrameDecryptor` receive non-empty `additional_data` with RTP timestamp bytes.
+
+## Why
+
+Stock `stasel/WebRTC` M146 calls audio frame encryptor with empty
+`additional_data` (`ad=0`), so nonce derivation based on timestamp is unavailable.
+
+Desktop uses frame timestamp for nonce. This patch aligns iOS with that approach by passing
+an 8-byte big-endian timestamp payload in `additional_data` (absolute RTP timestamp,
+including sender start offset):
+
+- bytes `0..3` = `0`
+- bytes `4..7` = RTP timestamp (big-endian)
+
+Same patch as Android: `mobile-android/tools/webrtc-custom/patches/0001-...`
+
+## Files
+
+- `build_custom_webrtc_ios.sh` — reproducible build script
+- `patches/0001-audio-e2ee-pass-rtp-timestamp-as-additional-data.patch` — WebRTC patch (identical to Android)
+
+## Build
+
+Requirements: macOS, Xcode, `depot_tools` in PATH.
+
+Bootstrap depot_tools first (if not installed):
+
+```bash
+git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git ~/depot_tools
+export PATH=$PATH:$HOME/depot_tools
+```
+
+Then build:
+
+```bash
+cd /path/to/Rosetta/tools/webrtc-custom-ios
+./build_custom_webrtc_ios.sh
+```
+
+Optional env vars:
+
+- `WEBRTC_ROOT` — checkout root (default: `$HOME/webrtc_ios`)
+- `WEBRTC_BRANCH` — default `branch-heads/6422` (M125, same as Android)
+- `WEBRTC_TAG` — use a specific tag/commit instead of branch
+- `OUT_FRAMEWORK` — output xcframework path (default: `Frameworks/WebRTC.xcframework`)
+- `SYNC_JOBS` — `gclient sync` jobs (default: `1`)
+- `SYNC_RETRIES` — sync retry attempts (default: `8`)
+
+## Integration in Xcode
+
+1. Remove `stasel/WebRTC` SPM dependency from Xcode project
+2. Add `Frameworks/WebRTC.xcframework` as Embedded Framework
+3. Build and verify: diagnostic logs should show `ad=8` instead of `ad=0`
+
+## Verification
+
+After building and integrating:
+
+```
+ENC frame#0 sz=53 ad=8 mode=raw-abs nonce=[00000000XXXXXXXX]
+DEC frame#0 sz=48 ad=8 mode=raw-abs ok=1 nonce=[00000000XXXXXXXX]
+```
+
+Where `XXXXXXXX` is the RTP timestamp in hex. This matches Desktop and Android behavior.
+
+## Maintenance
+
+- Keep patch small: only `audio/channel_send.cc` + `audio/channel_receive.cc`
+- Pin WebRTC branch/tag for releases (M125 = `branch-heads/6422`)
+- Rebuild xcframework on version bumps
+- Verify `ad=8` in diagnostic logs after each rebuild