SDAA320 June   2026 AM625 , AM625SIP , AM62D-Q1 , AM62L , AM62P

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Introduction
    1. 1.1 Key Highlights:
    2. 1.2 Basic Concepts:
      1. 1.2.1 PipeWire Server
      2. 1.2.2 PipeWire Clients
      3. 1.2.3 Session Manager
      4. 1.2.4 Nodes, Ports, and Links
    3. 1.3 PipeWire Main Components
  5. 2 Linux Audio Stack
  6. 3 Build SDK Image with PipeWire Support via Yocto
    1. 3.1 Steps to Run Yocto Builds on Host
      1. 3.1.1 Prerequisites (One-time setup)
    2. 3.2 Clone the oe-layer Setup
    3. 3.3 Download and Apply PipeWire Patches
    4. 3.4 Build PipeWire Image
  7. 4 Setup PipeWire on Sitara Devices
    1. 4.1 Hardware
      1. 4.1.1 SK-AM62B-P1
      2. 4.1.2 TMDS62LEVM
      3. 4.1.3 AUDIO-AM62D-EVM
    2. 4.2 Configure EVM Boot Mode
      1. 4.2.1 SK-AM62B-P1
      2. 4.2.2 TMDS62LEVM
      3. 4.2.3 AUDIO-AM62D-EVM
    3. 4.3 UART Console Setup
    4. 4.4 Flash the SD Card Image
    5. 4.5 Booting EVM with SD Card
  8. 5 Use PipeWire
    1. 5.1 Check Service Status
    2. 5.2 Enable PipeWire and Wireplumber
    3. 5.3 Start PipeWire and WirePlumber
    4. 5.4 General PipeWire commands
      1. 5.4.1 List All Objects Currently in PipeWire Server
      2. 5.4.2 List Only Nodes
      3. 5.4.3 Inspect Specific Object
    5. 5.5 Play and Record Stereo Audio
  9. 6 Configuration
    1. 6.1 Sink and Source Configuration
    2. 6.2 WirePlumber Configuration
  10. 7 Performance Benchmarks
    1. 7.1 Latency
    2. 7.2 CPU and Memory Usage
    3. 7.3 CPU and Memory Usage with Resampling
    4. 7.4 Observations
  11. 8 Summary
  12. 9 References
  13. 10IMPORTANT NOTICE AND DISCLAIMER

2 Linux Audio Stack

Linux Audio Stack Figure 2-1 Linux Audio Stack
  • Applications (media players, browsers, GStreamer-based tools etc.) generate audio streams and communicate through either the native PipeWire API or compatibility layers for other systems (Jack, PulseAudio, ALSA).
  • PipeWire daemon receives these audio streams and constructs a processing graph to handle mixing, routing, and scheduling of audio from multiple sources simultaneously.
  • Session manager (WirePlumber) applies policy decisions including device selection, stream routing rules, and automatic connection management between applications and hardware endpoints.
  • SPA (Simple Plugin API) plugins provide hardware abstraction. The ALSA plugin specifically interfaces with the kernel's ALSA subsystem to access physical audio devices.
  • Kernel drivers communicate with the actual hardware layer (audio codecs, sound cards, I2S buses, HDMI audio interfaces) to produce physical audio output or capture input.