Audio decoding

 

This article is a stub. Main article: Audio.

 

Because video and audio are often used together, more details on this topic are available under Video decoding page.

File formats

The following container formats are supported for files with audio, on all player models, unless noted otherwise:

Extension	Description	Audio codecs	Notes
.mp3	Raw MPEG audio elementary stream	MPEG Audio Layer III
.m4a, .mp4	MPEG-4 Part 14 Audio Only	AAC
.wma	Raw WMA elementary stream	WMA2
.wav	RIFF Audio File Format	PCM, DTS
.ac3	Raw AC-3 elementary stream	AC-3	Not supported on HMP200, HMP130, and HMP100.
.mka	Matroska Audio Only	AAC	Not supported on HMP200, HMP130, and HMP100.
.aiff, .aif	Audio Interchange File Format	PCM	Supported only on HMP200, HMP130 and HMP100.

Note:

Audio files are not supported and cannot be uploaded as Fusion content.

Codecs

Supported audio codecs

• AAC

  Advanced Audio Coding (AAC) is an audio coding standard for lossy digital audio compression. Designed to be the successor of the MP3 format, AAC generally achieves better sound quality than MP3 at similar bit rates.AAC has been standardized by ISO and IEC, as part of the MPEG-2 and MPEG-4 specifications. High Efficiency Advanced Audio Coding (HE-AAC) which is part of MPEG-4 Audio is an extension of Low Complexity AAC (AAC LC).

  Supported profiles (up to 6 channels input): (MPEG-2 Part 7) Low Complexity Profile, (MPEG-4 Part 3) AAC Profile and High-Efficiency AAC Profile (note that HE-AAC v2 profile is supported only on DiVA, HMP350 and HMP300; up to 8 channels input).

• MPEG-1/2 Layer III (MP3)

  MPEG-1 or MPEG-2 Audio Layer III, more commonly referred to as MP3, is an audio coding format for digital audio which uses a form of lossy data compression. Supported: 48KHz max sample rate and 2 channels. The previous versions: MPEG-1/2 Audio Layer II (MP2) and MPEG-1 Audio Layer I (MP1) are supported as well;

• Windows Media Audio (WMA v2).

  WMA is a lossy audio codec which can encode audio signals sampled at up to 48 kHz with up to two discrete channels (stereo). Like AAC, WMA was intended to address perceived deficiencies in the MP3 standard.

• Linear PCM (LPCM);

  Linear pulse-code modulation (LPCM) is a specific type of PCM where the quantization levels are linearly uniform. Supported only on HMP200, HMP130 and HMP100.

• ITU-T G.711 and G.726;

  G.711 is an ITU-T standard for audio companding. It is primarily used in telephony. G.726 is an ITU-T ADPCM speech codec standard covering the transmission of voice. Supported only on HMP200, HMP130 and HMP100.

• AC3 (Dolby Digital)

  Dolby Digital is the name for audio compression technologies, developed by Dolby Laboratories, containing up to six discrete channels of sound. AC-3 supports audio sample-rates up to 48 kHz. Supported on DiVA, HMP350 and HMP300 players.

Unsupported audio codecs

This list is not exhaustive and any codec that is not written above, should be considered as part of this list.

• 24-bit PCM audio;
• MPEG-4 SLS (HD-AAC);
• Raw AAC files (use AAC within an MP4 or M4A file instead!);
• RealAudio.