Setting AMR encoding mode for audio input stream (Known Issue)

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Article Metadata

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Tested with

Devices(s): All (S60)

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Compatibility

Platform(s): S60 2nd Edition, FP2 and FP3
S60 3rd Edition, S60 5th Edition

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Article

Keywords: SetBitRateL

Created: User:Technical writer 1 (March 30, 2007
Updated: March 23, 2010)

Last edited: hamishwillee (01 Aug 2012)

Description

S60 devices support streaming audio in AMR encoded format from S60 2nd Edition, Feature Pack 2 onwards. However, the AMR input stream is always encoded using the default encoding mode, which cannot be changed using APIs from the public SDK.

The default AMR-NB encoding mode for most S60 devices is 5.15 kbps (mode 1). CMdaAudioInputStream::SetBitRateL() (or any other streaming API on S60 SDK) cannot be used for selecting another encoding mode.

Solution

S60 3rd and 5th Editions

Custom AMR encoder configuration is possible with Speech Encoder Config API, available in the SDK API Plug-in packages for S60 3rd Edition and 5th Edition SDKs.

S60 2nd Edition

No solution available. Note that selecting a non-default encoding mode is possible when converting PCM to AMR using the CMMFCodec class. See TSS000457 - Configuring CMMFCodec for encoding audio to AMR.

See also

• CS001030 - Speech Encoder Config API
• Differences in audio streaming configuration on the S60 3rd Edition devices (Known Issue)
• TSS000597 - Streaming audio in encoded format in S60 3rd Edition
• TSS000457 - Configuring CMMFCodec for encoding audio to AMR