1. Computers
  2. Display Drivers
  3. Graphics Cards
  4. Memory
  5. Motherboards
  6. Processors
  7. Software
  8. Storage
  9. Operating Systems


Facebook RSS Twitter Twitter Google Plus


Phoronix Test Suite

OpenBenchmarking.org

ALSA: Audio Compression Offloading, Power Savings

Free Software

Published on 29 August 2012 05:42 PM EDT
Written by Michael Larabel in Free Software
24 Comments

Besides lots of graphics talks at the GStreamer 2012 Conference, the Advanced Linux Sound Architecture (ALSA) was talked about with a status report and mentions of some features soon to be landing in future Linux kernel releases.

The ALSA project status update at the GStreamer Conference in San Diego was shared by Takashi Iwai of SUSE.

One of the new ALSA features is support for audio compression offloading where the DSP handling of compressed audio formats can be offloaded from the CPU to a DSP, which can be more efficient and lower the CPU usage. The kernel core API for this audio compression offloading was pushed into the Linux 3.3 kernel while with the Linux 3.7 kernel there will be ASoC integration support as well as support for compression offloading with the Intel Medfield audio driver. The ALSA library code for this support is currently in a separate Git tree and not in mainline ALSA at this point.

Jack detection for ALSA has been another hot topic. There isn't any ALSA library API yet for audio jack detection and there's jack detection support being looked at via input device, via a control API, or possibly via extcon.

The Advanced Linux Sound Architecture is also seeing more PCM time adjustments coming, wallclock timestamp support is coming for precise hardware sample times, and there's an open development topic about embedding timestamps in the stream. The embedded timestamps were requested by Video 4 Linux.

Power savings for ALSA and its supported audio kernel drivers is also being expanded upon. The HD audio driver saw power-savings work in the Linux 3.5 kernel while an explicit power-saving trigger by a Linux kernel parameter will come in the Linux 3.7 kernel. Run-time power management integration is also coming to the Linux 3.7 kernel for dynamically turning off the HD audio controller and codec automatically.

Other recent ALSA work includes improving the BIOS auto-parser, robust and accurate position reporting, firmware patch loading, debug/QA work with an emulator, and a non-snoop mode. A channel mapping API was also proposed.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
Latest Linux Hardware Reviews
  1. A Walkthrough Of The New 32 System Open-Source Linux Benchmarking Test Farm
  2. Habey MITX-6771: Mini-ITX Board With Quad-Core J1900 Bay Trail
  3. OCZ Vector 150 SSD On Linux
  4. Noctua i4 CPU Cooler: Great For Cooling High-End LGA-2011v3 CPUs
Latest Linux Articles
  1. AMD Kaveri: Open-Source Radeon Gallium3D vs. Catalyst 14.12 Omega Driver
  2. 12-Way AMD Catalyst 14.12 vs. NVIDIA 346 Series Linux GPU Comparison
  3. AMD Catalyst 14.12 Omega Driver Brings Mixed Results For Linux Users
  4. 6-Way Winter 2014 Linux Distribution Comparison
Latest Linux News
  1. FSF's High Priority Project List Now Has A Committee
  2. Details On Using OpenACC & GPUs With GCC
  3. Ubuntu 15.04 Alpha 1 For Its Various Flavors
  4. Git 2.2.1 Released To Fix Critical Security Issue
  5. WTFTW: A Tiling Window Manager Written In Rust
  6. Jolla's Sailfish OS Update 10 Is Now Available
  7. HP To Launch Linux++ Operating System Next Year
  8. Civilization: Beyond Earth Launches For Linux
  9. NIR Has Been Revised As A New IR For Mesa
  10. New 64-bit Linux Kernel Vulnerabilities Disclosed This Week
Latest Forum Discussions
  1. Debian init discussion in Phoenix Wright format
  2. The New SuperTuxKart Looks Better, But Can Cause GPU/Driver Problems
  3. XLennart: A Game For Systemd Haters With Nothing Better To Do
  4. Bench specific mount point
  5. Tool for measuring FPS in games
  6. Need some hand holding with upgrading xserver
  7. Ubuntu Developers Still Thinking What To Do About Adobe Flash Support
  8. Microsoft buying Mojang