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Visual C++

chxavplayerstate.cpp：源码内容
							/************************************************************************
 * chxavplayerstate.cpp
 * --------------------
 *
 * Synopsis:
 * Contains the implementation of the CHXAvPlayerState class. 
 *
 * Target:
 * Symbian OS
 *
 *
 * (c) 1995-2003 RealNetworks, Inc. Patents pending. All rights reserved.
 *
 *****************************************************************************/
/*****************************************************************************
 user command        hxplayer event                       player state dispatch
 -------             --------------                       ---------------------
 Play
                                                          OnPlayInitiate
                     {if non-local url}                   
                                                          OnNetConnect
                      
                     OnBegin
                                                          OnResume
                     (BeginChangeLayout, 
                      SitesNeeded, 
                      DoneChangeLayout for non-smil case)
                     OnPresentationOpened
                                                          OnLoadSession
                     (BeginChangeLayout, 
                      SitesNeeded, 
                      DoneChangeLayout for smil case)
                    {if non-local url smil track added}                   
                                                          OnNetConnect
                     OnBuffering (BUFFERING_START_UP)
                     (local: 100 once
                      network: N - 100; N usually starts at 0)
                                                          OnBeginBuffering (0 and 100)
                                                          OnBuffering
 Stop
                                                          OnStop
                      OnPresentationClosed
                                                          OnStop
 StartSeek
                                                          (Pause)
                                                          OnPause
                      OnPause
                                                          OnPause
                                                          OnBeginSeek
 SetSeekPoint
                                                          OnNewPos
 EndSeek
                                                          (Seek)
                      OnPreSeek (during call to seek)
                                                         (Begin) * pause or stop also possible here
                      OnBegin
                                                          OnResume           
                      OnBuffering (BUFFERING_SEEK)
                                                          OnBuffering
                      OnPostSeek
 
// XXXLCM we really should switch to using state objects (this class is misnamed and
//        is just a poorly-defined helper class)
//     
**********************************************************************************/
#include "hxstring.h"
#include "hxcore.h"
#include "hxsym_debug.h"
#include "hxsym_memutil.h"
#include "chxavplayerstatedispatch.h"
#include "chxavplayerstate.h"
CHXAvPlayerState::CHXAvPlayerState()
: m_state(Stopped)
, m_bufferState(NotBuffering)
, m_pDispatch(0)
, m_lastBufferPercent(100)
, m_lastTime(-1)
{
}
CHXAvPlayerState::~CHXAvPlayerState()
{
    HX_DELETE(m_pDispatch);
}
void CHXAvPlayerState::ConstructL()
{
    HX_ASSERT(m_pDispatch == NULL);
    m_pDispatch = new (ELeave) CHXAvPlayerStateDispatch();
}
void CHXAvPlayerState::ChangeState(State destState)
{
    DPRINTF(SYMP_INFO, ("  *** PLAYER STATE --> %s ***n", dbg::State(destState)));
    m_state = destState;
}
void CHXAvPlayerState::ChangeBufferState(BufferState destState)
{
    m_bufferState = destState;
}
void CHXAvPlayerState::RemoveObserver(IHXSymPlayerStateObserver* observer)
{
    HX_ASSERT(m_pDispatch != NULL);
    m_pDispatch->RemoveObserver(observer);
}
void CHXAvPlayerState::AddObserver(IHXSymPlayerStateObserver* observer)
{
    HX_ASSERT(m_pDispatch != NULL);
    m_pDispatch->AddObserver(observer);
}
// when user play command issued or play auto-starts
void CHXAvPlayerState::OnPlayInitiate(const char* url)
{
    // start in Initiating state
    if(m_state != Initiating)
    {
        ChangeState(Initiating);
        m_pDispatch->OnPlayInitiate(url);
    } 
}
void CHXAvPlayerState::OnNetConnect()
{
    DPRINTF(SYMP_INFO, ("CHXAvNaviPaneControl::OnNetConnect()n"));
    // sometimes we can get a net connect while paused if we pause a smil pres after open but before first buffer
    if(Connecting != m_state && Paused != m_state)
    {
        ChangeState(Connecting);
        m_pDispatch->OnNetConnect();
    }
}
// when open presentation notification received; headers are available and sites ready only for non-smil
void CHXAvPlayerState::OnLoadSession(IHXRequest *request)
{
    DPRINTF(SYMP_INFO, ("OnLoadSession(): Memory: System Free = %ld; Heap Free = %ldn", MemUtil::GetSystemFree(), MemUtil::GetHeapFree()));
    m_lastTime = -1;
    m_pDispatch->OnLoadSession(request);
}
// when error notification received
void CHXAvPlayerState::OnError(HX_RESULT code)
{
    DPRINTF(SYMP_INFO, ("OnError(): System Free = %ld; Heap Free = %ldn", MemUtil::GetSystemFree(), MemUtil::GetHeapFree()));
    m_pDispatch->OnError(code);
}
// when user advances playlist; when playlist auto-advances
void CHXAvPlayerState::OnAdvancePlaylist()
{
    m_pDispatch->OnAdvancePlaylist();
}
// when OnBegin notification or first timer tick received
void CHXAvPlayerState::OnResume()
{
    DPRINTF(SYMP_INFO, ("OnResume(): System Free = %ld; Heap Free = %ldn", MemUtil::GetSystemFree(), MemUtil::GetHeapFree()));
    if(m_state != Playing)
    {
        m_lastBufferPercent = 100;
        ChangeBufferState(NotBuffering); // buffering will come next
        ChangeState(Playing);
        m_pDispatch->OnResume();
    }
}
// when user stop command issued, or OnStop, after presentation is closed
void CHXAvPlayerState::OnStop()
{
    if(m_state != Stopped)
    {
        m_lastBufferPercent = 100;
        ChangeBufferState(NotBuffering); // in case stop while buffering
        ChangeState(Stopped);
        m_pDispatch->OnStop();
    }
}
// when user pause command issued, when user begins seek
void CHXAvPlayerState::OnPause()
{
    if(m_state != Paused)
    {
        ChangeState(Paused);
        m_pDispatch->OnPause();
    }
}
// when buffering occurs; can occur during play, pause (live) and seek state
void CHXAvPlayerState::OnBuffering(ULONG32 type, UINT16 percent)
{
    // if first buffer after connect/initiate ensure we are playing state
    if( m_state  == Initiating || m_state == Connecting )
    {
        OnResume();
    }
    BufferState dest;
    switch(type)
    {
    case BUFFERING_START_UP:
        dest = BufferLoad; // first buffer
        break;
    case BUFFERING_SEEK:
        dest = BufferSeek; // buffer after seek
        break;
    default:
        dest = BufferPlain; // plain ol' buffering
        break;
    }
    bool bIsNewPercentage = (m_lastBufferPercent != percent);
    m_lastBufferPercent = percent;
    if(dest != m_bufferState)
    {
        //
        // begin transition to new buffering state; this also handles seek during
        // initial buffering, i.e., BUFFERING_START_UP to BUFFERING_CONGESTION
        //
        ChangeBufferState(dest);
        DPRINTF(SYMP_INFO, ("CHXAvPlayerState::OnBuffering(): begin bufferingn"));
        m_pDispatch->OnBeginBuffering(true);
    }
    if(bIsNewPercentage)
    {
        //DPRINTF(SYMP_INFO, ("OnBuffering(): Memory: System Free = %ld; Heap Free = %ldn", MemUtil::GetSystemFree(), MemUtil::GetHeapFree()));
        // forward new buffering position
        m_pDispatch->OnBuffering(percent);
    }
    if(100 == percent)
    {
        // buffering complete; transition out of buffering state
        if(NotBuffering != m_bufferState)
        {
            ChangeBufferState(NotBuffering);
            DPRINTF(SYMP_INFO, ("CHXAvPlayerState::OnBuffering(): end bufferingn"));
            m_pDispatch->OnBeginBuffering(false);
        }
    }
    
}
// when user command to begin seek interaction issued
void CHXAvPlayerState::OnBeginSeek()
{
    if(m_state != Seeking)
    {
        ChangeState(Seeking);
        m_pDispatch->OnBeginSeek();
    }
}
// when user sets new position via some ui control or playback advances to new position in timeline
void CHXAvPlayerState::OnNewPos(ULONG32 time)
{
    if( time != m_lastTime)
    {
        m_lastTime = time;
        m_pDispatch->OnNewPos(time);
    }
}
// when volume command issued
void CHXAvPlayerState::OnVolume(unsigned int percentVol)
{
    m_pDispatch->OnVolume(percentVol);
}
// when mute command issued
void CHXAvPlayerState::OnMute(bool bMute)
{
    m_pDispatch->OnMute(bMute);
}

						