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Archived:Background noise while streaming zero-filled buffers (Known Issue)

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{{Archived|timestamp=20120314045558|user=roy.debjit| }}
 
[[Category:Known Issue]][[Category:Symbian C++]][[Category:Audio]][[Category:S60 2nd Edition (initial release)]][[Category:S60 3rd Edition (initial release)]][[Category:S60 3rd Edition FP1]]
 
[[Category:Known Issue]][[Category:Symbian C++]][[Category:Audio]][[Category:S60 2nd Edition (initial release)]][[Category:S60 3rd Edition (initial release)]][[Category:S60 3rd Edition FP1]]
 
{{ArticleMetaData <!-- v1.2 -->
 
{{ArticleMetaData <!-- v1.2 -->
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|devices= <!-- Devices tested against - e.g. ''devices=Nokia 6131 NFC, Nokia C7-00'') -->
 
|devices= <!-- Devices tested against - e.g. ''devices=Nokia 6131 NFC, Nokia C7-00'') -->
 
|sdk= <!-- SDK(s) built and tested against (e.g. [http://linktosdkdownload/ Nokia Qt SDK 1.1]) -->
 
|sdk= <!-- SDK(s) built and tested against (e.g. [http://linktosdkdownload/ Nokia Qt SDK 1.1]) -->
|platform= S60 2nd Edition and FP1, FP2, FP3<br>S60 3rd Edition and FP1
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|platform= S60 2nd Edition (initial release) and FP1, FP2, FP3<br>S60 3rd Edition (initial release) and FP1
 
|devicecompatability= <!-- Compatible devices (e.g.: All* (must have GPS) ) -->
 
|devicecompatability= <!-- Compatible devices (e.g.: All* (must have GPS) ) -->
 
|dependencies= <!-- Any other/external dependencies e.g.: Google Maps Api v1.0 -->
 
|dependencies= <!-- Any other/external dependencies e.g.: Google Maps Api v1.0 -->
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|update-by= <!-- After significant update: [[User:username]]-->
 
|update-by= <!-- After significant update: [[User:username]]-->
 
|update-timestamp= <!-- After significant update: YYYYMMDD -->
 
|update-timestamp= <!-- After significant update: YYYYMMDD -->
|creationdate= May 21, 2007
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|creationdate= 20070521
 
|author= [[User:Technical writer 1]]
 
|author= [[User:Technical writer 1]]
 
<!-- The following are not in current metadata -->
 
<!-- The following are not in current metadata -->
|subcategory= Audio
 
 
|id= KIS000656
 
|id= KIS000656
 
}}
 
}}
  
{{Archived|timestamp=20120314045558|user=roy.debjit| }}
 
 
==Description==
 
==Description==
In some S60 devices the level of background noise may be disturbing when using an audio output stream to play back silence; that is, when the stream is fed with zero-filled buffers.
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{{Abstract|In some S60 2nd and 3rd Edition devices the level of background noise may be disturbing when using an audio output stream to play back silence; that is, when the stream is fed with zero-filled buffers.}}
  
 
==Solution==
 
==Solution==
Applications should not implement a 'mute' functionality by streaming zero-filled &nbsp;buffers. Instead, the output stream should either be stopped or its volume level should be set to 0.<br>Note that adjusting the volume is a significantly faster operation than stopping/ restarting the stream.
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Applications should not implement a 'mute' functionality by streaming zero-filled &nbsp;buffers. Instead, the output stream should either be stopped or its volume level should be set to 0.
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Note that adjusting the volume is a significantly faster operation than stopping/restarting the stream.

Latest revision as of 09:48, 15 June 2012

Archived.pngArchived: This article is archived because it is not considered relevant for third-party developers creating commercial solutions today. If you think this article is still relevant, let us know by adding the template {{ReviewForRemovalFromArchive|user=~~~~|write your reason here}}.

Article Metadata
Compatibility
Platform(s): S60 2nd Edition (initial release) and FP1, FP2, FP3
S60 3rd Edition (initial release) and FP1
S60 3rd Edition FP1
S60 3rd Edition (initial release)
S60 2nd Edition (initial release)
Article
Created: User:Technical writer 1 (21 May 2007)
Last edited: hamishwillee (15 Jun 2012)

[edit] Description

In some S60 2nd and 3rd Edition devices the level of background noise may be disturbing when using an audio output stream to play back silence; that is, when the stream is fed with zero-filled buffers.

[edit] Solution

Applications should not implement a 'mute' functionality by streaming zero-filled  buffers. Instead, the output stream should either be stopped or its volume level should be set to 0.

Note that adjusting the volume is a significantly faster operation than stopping/restarting the stream.

This page was last modified on 15 June 2012, at 09:48.
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