audio_session-mda.cpp

linux下的一款播放器

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: audio_session-mda.cpp,v 1.2.2.6 2004/07/09 02:01:29 hubbe Exp $
 * 
 * Portions Copyright (c) 1995-2004 RealNetworks, Inc. All Rights Reserved.
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 * the file under the current version of the RealNetworks Community
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 * will apply. You may also obtain the license terms directly from
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#if defined (HELIX_CONFIG_CALYPSO_AUDIO_PREF)
#include <calypso/audiopreference.h>
#endif
#include <mda/common/audio.h>

#include "hxcom.h"
#include "hxslist.h"
#include "hxausvc.h"
#include "hxbuffer.h"
#include "audio_session-mda.h"
#include "hxtick.h"

static const TInt KClientPriority = 69; //EMdaPriorityNormal;
#if defined(HELIX_CONFIG_CALYPSO_AUDIO_PREF)
static const TMdaPriorityPreference KPriorityPref = (TMdaPriorityPreference)KAudioPrefComposer; 
#else
static const TMdaPriorityPreference KPriorityPref = EMdaPriorityPreferenceTime;
#endif // SERIES60_PLAYER

const INT32 WriteBufferDepth = 10; // Number of buffers we allow in the queue before blocking the caller

////////////////////////////////////////////////////
//
static TInt FlagToNumber(TMdaAudioDataSettings::TAudioCaps flag)
{
    switch( flag )
    {
    case TMdaAudioDataSettings::ESampleRate8000Hz:
        return 8000;
    case TMdaAudioDataSettings::ESampleRate11025Hz:
        return 11025;
    case TMdaAudioDataSettings::ESampleRate16000Hz:
        return 16000;
    case TMdaAudioDataSettings::ESampleRate22050Hz:
        return 22050;
    case TMdaAudioDataSettings::ESampleRate32000Hz:
        return 32000;
    case TMdaAudioDataSettings::ESampleRate44100Hz:
        return 44100;
    case TMdaAudioDataSettings::ESampleRate48000Hz:
        return 48000;
    case TMdaAudioDataSettings::EChannelsMono:
        return 1;
    case TMdaAudioDataSettings::EChannelsStereo:
        return 2;
    default:
        return 0;
        break;
    }
    return 0;
}

static TMdaAudioDataSettings::TAudioCaps NumberToFlag(TInt num)
{
    switch(num)
    {
    case 1:
        return  TMdaAudioDataSettings::EChannelsMono;
    case 2:
        return  TMdaAudioDataSettings::EChannelsStereo;
    case 8000:
        return  TMdaAudioDataSettings::ESampleRate8000Hz;
    case 11025:
        return  TMdaAudioDataSettings::ESampleRate11025Hz;
    case 16000:
        return  TMdaAudioDataSettings::ESampleRate16000Hz;
    case 22050:
        return  TMdaAudioDataSettings::ESampleRate22050Hz;
    case 32000:
        return  TMdaAudioDataSettings::ESampleRate32000Hz;
    case 44100:
        return  TMdaAudioDataSettings::ESampleRate44100Hz;
    case 48000:
        return  TMdaAudioDataSettings::ESampleRate48000Hz;
    default:
        return (TMdaAudioDataSettings::TAudioCaps)0;
        break;
    }
    return (TMdaAudioDataSettings::TAudioCaps)0;
}

HXSymbianAudioTimeline::HXSymbianAudioTimeline()
{
    Reset(0);
}

HXSymbianAudioTimeline::~HXSymbianAudioTimeline()
{}

void HXSymbianAudioTimeline::Reset(UINT32 ulByteRate)
{
    m_ulByteRate = ulByteRate;

    ClearWritten();

    m_ulBaseSec = 0;
    m_ulBaseSubSecBytes = 0;

    m_ulLastGetTime = 0;
}

void HXSymbianAudioTimeline::OnWrite(UINT32 ulBytes)
{
    UINT32 ulSum = m_ulSubSecBytes + ulBytes;
    UINT32 ulSec = ulSum / m_ulByteRate;

    m_ulSecWritten += ulSec;
    m_ulSubSecBytes = ulSum - (ulSec * m_ulByteRate);
}

UINT32 HXSymbianAudioTimeline::GetPlaybackTime()
{
    UINT32 ulBaseMs = GetMs(m_ulBaseSec, m_ulBaseSubSecBytes);
    UINT32 ulWrittenMs = GetWrittenTime();
    UINT32 ulRet = ulBaseMs;
    UINT32 ulDeviceTimeMs = GetWallclockTime();
    
    // Only use the device time if it
    // is less than the amount of data
    // written
    if (ulWrittenMs > ulDeviceTimeMs)
    {
        ulRet += ulDeviceTimeMs;
    }
    else
    {
        ulRet += ulWrittenMs;
    }

    // Enforce monotonically increasing return values
    if (ulRet >= m_ulLastGetTime)
    {
        m_ulLastGetTime = ulRet;
    }
    else
    {
        ulRet = m_ulLastGetTime;
    }

    return ulRet;
}

UINT32 HXSymbianAudioTimeline::GetWrittenTime() const
{
    return GetMs(m_ulSecWritten, m_ulSubSecBytes);
}


UINT32 HXSymbianAudioTimeline::GetWallclockTime() const
{
    UINT32 ulRet = m_ulDevTimeMs;

    if (m_ulDevTimeMs)
    {
        ulRet += HX_GET_TICKCOUNT() - m_ulWallclockTime;
    }

    return ulRet;
}

void HXSymbianAudioTimeline::OnPlay()
{
    ClearWritten();
}

void HXSymbianAudioTimeline::OnPauseOrUnderflow()
{
    // Add the written time to the base time
    m_ulBaseSec += m_ulSecWritten;
    m_ulBaseSubSecBytes += m_ulSubSecBytes;

    // Normalize the base time values
    while (m_ulBaseSubSecBytes >= m_ulByteRate)
    {
        m_ulBaseSec++;
        m_ulBaseSubSecBytes -= m_ulByteRate;
    }
    
    // Clear the bytes written state
    ClearWritten();
}

BOOL HXSymbianAudioTimeline::NeedDeviceTime() const
{
    // We only want a device time if we don't haven't
    // received a non-zero device time.
    return (m_ulDevTimeMs == 0);
}


void HXSymbianAudioTimeline::SetDeviceTime(UINT32 ulDeviceTimeMs)
{
    if (NeedDeviceTime())
    {
        m_ulDevTimeMs = ulDeviceTimeMs;
        m_ulWallclockTime = HX_GET_TICKCOUNT();
    }
}

UINT32 HXSymbianAudioTimeline::GetMs(UINT32 ulSec, UINT32 ulSubSec) const
{
    UINT32 ulRet = ulSec * 1000;

    if (m_ulByteRate)
    {
        ulRet += (ulSubSec * 1000) / m_ulByteRate;
    }

    return ulRet;
}

void HXSymbianAudioTimeline::ClearWritten()
{
    m_ulSecWritten = 0;
    m_ulSubSecBytes = 0;

    m_ulDevTimeMs = 0;
    m_ulWallclockTime = 0;
}

//
// class HXSymbianAudioSession:
//

//
// HXSymbianAudioSession::ctor:
//
// add the session to the server
//
HXSymbianAudioSession::HXSymbianAudioSession(RThread& client,
                                             HXSymbianAudioServer* pServer)
    : CSession(client),
      m_pServer(pServer),
      m_pStream(0),
      m_sampleRate(TMdaAudioDataSettings::ESampleRate8000Hz),
      m_channels(TMdaAudioDataSettings::EChannelsMono),
      m_pData(0, 0),
      m_wantsNotify(false),
      m_reason(KErrNone),
      m_open(false),
      m_bPaused(TRUE),
      m_bWritePending(FALSE)
{
    // add the session to the server
    m_pServer->AddSession();
}

//
// HXSymbianAudioSession::dtor
//
HXSymbianAudioSession::~HXSymbianAudioSession()
{
    DoCleanup();
}


//
// HXSymbianAudioSession::NewL
//
// creates a new session
//
HXSymbianAudioSession* HXSymbianAudioSession::NewL(RThread& client,
                                                   HXSymbianAudioServer* pServer)
{
    HXSymbianAudioSession* pSession =
        new (ELeave) HXSymbianAudioSession(client, pServer);

    return pSession;
}

//
// HXSymbianAudioSession::ServiceL
//
// services a client message
//
void HXSymbianAudioSession::ServiceL(const RMessage& mesg)
{
    switch (mesg.Function()) 
    {
    case HXSymbianAudioServer::EAS_Init:
        Init();
        break;
    case HXSymbianAudioServer::EAS_Play:
        Play();
        break;
    case HXSymbianAudioServer::EAS_Pause:
        Pause();
        break;
    case HXSymbianAudioServer::EAS_Write:
        Write();
        break;
    case HXSymbianAudioServer::EAS_CancelWrite:
        mesg.Complete(KErrNone);
        break;
    case HXSymbianAudioServer::EAS_GetTime:
        GetTime();
        break;
    case HXSymbianAudioServer::EAS_GetBlocksBuffered:
        GetBlocksBuffered();
        break;
    case HXSymbianAudioServer::EAS_SetVolume:
        SetVolume();
        break;
    case HXSymbianAudioServer::EAS_GetVolume:
        GetVolume();
        break;
    case HXSymbianAudioServer::EAS_GetMaxVolume:
        GetMaxVolume();
        break;
    case HXSymbianAudioServer::EAS_GetMinVolume:
        GetMinVolume();
        break;
    case HXSymbianAudioServer::EAS_Stop:
        Stop();
        break;
    case HXSymbianAudioServer::EAS_RequestDeviceTakenNotification:
        RequestDeviceTakenNotification();
        break;
    case HXSymbianAudioServer::EAS_CancelDeviceTakenNotification:
        CancelDeviceTakenNotification();
        break;
    default:
        mesg.Complete(KErrNotSupported);
        break;
    }
}

//
// HXSymbianAudioSession::Init
//
// 1. Matches input sample rate to output sample rate
//    by building a sample rate converter, if necessary.
// 2. Opens and initializes the audio device.
//
void HXSymbianAudioSession::Init()
{
    TInt err = KErrNone;

    // translate the audio props to flags needed by interface
    m_sampleRate = NumberToFlag(Message().Int0());
    m_channels   = NumberToFlag(Message().Int1());

    m_timeline.Reset(GetByteRate());
    m_bPaused = TRUE;

    if (m_open)
    {
        TRAP(err, m_pStream->SetAudioPropertiesL(m_sampleRate,