WebRTC (Audio-Only Build)

Custom WebRTC build from M141 (branch-heads/7151) optimized for audio + data channel use cases.

What's Included

• Audio codecs: Opus, G.711, G.722, PCM16B
• Audio processing module (AEC, NS, AGC)
• Data channels (SCTP)
• Full peer connection API (RTCPeerConnection, RTCSessionDescription, RTCIceCandidate, etc.)
• RTCAudioSession / RTCAudioSessionConfiguration (iOS)

What's Stripped

Compared to the full WebRTC build:

Feature	Status
H.264 (OpenH264)	Disabled (rtc_use_h264=false)
H.265/HEVC	Disabled (rtc_use_h265=false)
AV1 (libaom)	Disabled (enable_libaom=false)
dav1d decoder	Disabled
iLBC codec	Disabled (rtc_include_ilbc=false)
Protobuf	Disabled (rtc_enable_protobuf=false)
Metrics/tracing	Disabled
Tests/examples	Excluded

Note: VP8/VP9 (libvpx) headers are still compiled for build graph compatibility but the video codec factories are not used when only audio tracks are created.

Size Comparison

Slice	Full Build (stasel M137)	This Build (M141)
ios-arm64	~11MB	6.4MB
Total xcframework	~87MB	39MB

Platforms

• iOS 17.0+ (device arm64, simulator arm64/x86_64)
• macOS 13.5+ (arm64/x86_64)

Installation (SPM)

.package(url: "https://github.com/perplexityai/webRTC.git", exact: "141.0.0-audio-only")

Building From Source

Requires depot_tools on your PATH. Takes 30-60 minutes.

# Full build: fetch source, build iOS + macOS, package xcframework
./build.sh

# Rebuild without re-fetching source
./build.sh --skip-fetch

# iOS only (skip macOS slices)
./build.sh --skip-macos

The script fetches M141 (branch-heads/7151), builds iOS slices (arm64 device + arm64/x64 simulator), builds macOS slices (arm64 + x86_64), assembles the xcframework, and prints the SPM checksum.

See build.sh for all the GN args and details.