Archived:SetDecoderMode() not required with AMR codec on S60 3rd Edition (Known Issue)

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Compatibility

Platform(s): S60 3rd Edition, S60 3rd Edition, FP1

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Article

Created: User:Technical writer 1 (13 Nov 2007)

Last edited: hamishwillee (21 Jun 2012)

Overview

When trying to set the decoder mode for AMR codec using APS v2.4.1, KErrNotSupported error is returned.

Description

Audio Proxy Server supports controlling the AMR bitrate since version 2.4.1.

According to the APS documentation, the following functions are used for configuring the codec:

 TInt RAPSSession::SetDecoderMode(TAPSCodecMode aMode);
 TInt RAPSSession::SetEncoderMode(TAPSCodecMode aMode);

However, SetDecoderMode always returns KErrNotSupported when the player stream has been initialized with the AMR codec.

Solution

Usage and valid parameters (TAPSCodecMode enumeration) depend on the codec that was used when initializing the player and/or recorder.

The following parameters are valid for SetEncoderMode when the recorder is initialized:

Codec	Valid parameters (TAPSCodecMode)	Notes
G.729	N/A	Always returns KErrNotSupported
G.711	EALawOr20ms, EULawOr30ms	A-Law or µ-Law
iLBC	EALawOr20ms, EULawOr30ms	20ms or 30ms frame size
AMR	EAMRNB4750bps .. EAMRNB12200bps	AMR mode 0 (4.75 kbps) .. 7 (12.2 kbps)

The following parameters are valid for SetDecoderMode when the player is initialized:

Codec	Valid parameters (TAPSCodecMode)	Notes
G.729	N/A	Always returns KErrNotSupported
G.711	EALawOr20ms, EULawOr30ms	A-Law or µ-Law
iLBC	EALawOr20ms, EULawOr30ms	20ms or 30ms frame size
AMR	N/A	Does nothing (KErrNotSupported)

Note that SetDecoderMode mode always returns KErrNotSupported for AMR. This error can be ignored, because unlike G.711 and iLBC decoders, AMR decoder doesn't need to be configured for a specific bitrate.