author | William Roberts <williamr@symbian.org> |
Tue, 16 Mar 2010 16:12:26 +0000 | |
branch | Symbian2 |
changeset 2 | 2fe1408b6811 |
parent 0 | 061f57f2323e |
child 4 | 837f303aceeb |
permissions | -rw-r--r-- |
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// Copyright (c) 2001-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of the License "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.symbianfoundation.org/legal/licencesv10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// |
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#ifndef __MMFBASE_H__ |
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#define __MMFBASE_H__ |
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// Standard EPOC32 includes |
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#include <e32base.h> |
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/** |
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@publishedAll |
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@released |
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The priority for clients accessing a sound output device for audio playback or audio streaming. |
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This is a value between EMdaPriorityMin and EMdaPriorityMax. The higher value indicates a more |
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important request. It is used to resolve conflicts when more than one client tries to access the |
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same hardware resource simultaneously. |
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One of these values is passed in the first parameter to CMdaAudioOutputStream::SetPriority(). |
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@see CMdaAudioOutputStream::SetPriority() |
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*/ |
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enum TMdaPriority |
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{ |
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/** |
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The lowest priority (= – 100). This indicates that the client can be interrupted |
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by any other client. |
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*/ |
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EMdaPriorityMin = -100, |
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/** |
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Normal priority. This indicates that the client can be interrupted but only by higher priority clients. |
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*/ |
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EMdaPriorityNormal = 0, |
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/** |
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The highest priority (= 100). This indicates that the client cannot be interrupted by other clients. |
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*/ |
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EMdaPriorityMax = 100 |
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}; |
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/** |
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@publishedAll |
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@released |
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A set of priority values which define the behaviour to be adopted by an |
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audio client if a higher priority client takes over the device. |
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*/ |
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enum TMdaPriorityPreference |
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{ |
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/** |
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No priority. |
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*/ |
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EMdaPriorityPreferenceNone = 0x00000000, |
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/** |
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The audio data is time sensitive. The playback operation fails if it cannot happen when |
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requested but degraded output such as mixing or muting is allowed. |
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*/ |
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EMdaPriorityPreferenceTime = 0x00000001, |
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/** |
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The audio data must be played at the best possible quality (for example, it must not be degraded by |
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muting or mixing). The playback operation is delayed until the sound device is available for exclusive use. |
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*/ |
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EMdaPriorityPreferenceQuality = 0x00000002, |
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/** |
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The audio data is both time and quality sensitive. The playback operation fails if it cannot |
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happen immediately at the highest quality. |
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*/ |
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EMdaPriorityPreferenceTimeAndQuality = EMdaPriorityPreferenceTime|EMdaPriorityPreferenceQuality |
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}; |
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/** |
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@publishedAll |
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@released |
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Holds the current state of DevSound. |
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*/ |
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enum TMMFState |
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{ |
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/** Idle state. |
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*/ |
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EMMFStateIdle, |
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/** The MMF is currently playing. |
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*/ |
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EMMFStatePlaying, |
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/** The MMF is playing a tone. |
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*/ |
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EMMFStateTonePlaying, |
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/** The MMF is currently recording. |
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*/ |
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EMMFStateRecording, |
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/** The MMF is playing and recording. |
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*/ |
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EMMFStatePlayingRecording, |
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/** The MMF is converting data. |
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*/ |
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EMMFStateConverting |
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}; |
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/** |
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@publishedAll |
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@released |
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A class type representing the audio client's priority, |
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priority preference and state settings. |
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*/ |
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class TMMFPrioritySettings |
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{ |
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public: |
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TMMFPrioritySettings(); |
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/** |
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Absolute priority of a client of the MMF Server. |
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Used by the policy server to determine which client should gain access to the sound device. |
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The priority which should be an integer in the range -100 to +100. |
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*/ |
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TInt iPriority; |
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/** |
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The priority preference that expresses the nature of the priority that can be none, |
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time (or speed), quality or both time and quality. |
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If this is set to EMdaPriorityPreferenceTime then the audio data is time sensitive. The playback |
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operation fails if it cannot happen when requested but degraded output such as mixing or muting |
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is allowed. |
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If this is set to EMdaPriorityPreferenceQuality then the audio data must be played at the best possible |
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quality (for example, it must not be degraded by muting or mixing). The playback operation is delayed |
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until the sound device is available for exclusive use. |
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If this is set to EMdaPriorityPreferenceTimeAndQuality then the audio data is both time and quality |
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sensitive. The playback operation fails if it cannot happen immediately at the highest quality. |
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*/ |
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TMdaPriorityPreference iPref; |
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/** |
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The state of the MMF player such as idle, playing, recording and so on. See the TMMFState enum for possible states. |
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*/ |
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TMMFState iState; |
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private: |
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/** |
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This member is internal and not intended for use. |
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*/ |
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TInt iReserved1; |
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}; |
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/** |
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@publishedAll |
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@released |
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This is a TPckgBuf package of a TMMFPrioritySettings. |
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*/ |
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typedef TPckgBuf<TMMFPrioritySettings> TMMFPrioritySettingsPckg; |
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/** |
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Initializes the object with arbitrary values. |
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*/ |
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inline TMMFPrioritySettings::TMMFPrioritySettings() : iPriority(EMdaPriorityNormal), iPref(EMdaPriorityPreferenceNone), iState(EMMFStateIdle), iReserved1(0) |
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{ |
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} |
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#endif |