C++ Hydrogen::triggerRelocateDuringPlay方法代码示例

void JackOutput::updateTransportInfo()
{
		if ( locate_countdown == 1 )
				locate( locate_frame );
		if ( locate_countdown > 0 )
				locate_countdown--;

		if ( Preferences::get_instance()->m_bJackTransportMode !=  Preferences::USE_JACK_TRANSPORT   ) return;

				m_JackTransportState = jack_transport_query( client, &m_JackTransportPos );


				// update m_transport with jack-transport data
				switch ( m_JackTransportState ) {
				case JackTransportStopped:
						m_transport.m_status = TransportInfo::STOPPED;
						//infoLog( "[updateTransportInfo] STOPPED - frames: " + to_string(m_transportPos.frame) );
						break;

				case JackTransportRolling:
						if ( m_transport.m_status != TransportInfo::ROLLING && ( m_JackTransportPos.valid & JackPositionBBT ) ) {
								must_relocate = 2;
								//WARNINGLOG( "Jack transport starting: Resyncing in 2 x Buffersize!!" );
						}
						m_transport.m_status = TransportInfo::ROLLING;
						//infoLog( "[updateTransportInfo] ROLLING - frames: " + to_string(m_transportPos.frame) );
						break;

				case JackTransportStarting:
						m_transport.m_status = TransportInfo::STOPPED;
						//infoLog( "[updateTransportInfo] STARTING (stopped) - frames: " + to_string(m_transportPos.frame) );
						break;

				default:
						ERRORLOG( "Unknown jack transport state" );
		}


		// FIXME
		// TickSize and BPM
		Hydrogen * H = Hydrogen::get_instance();
		H->setTimelineBpm(); // dlr: fix #168, jack may have re-located us anywhere, check for bpm change every cycle

		if ( m_JackTransportPos.valid & JackPositionBBT ) {
			float bpm = ( float )m_JackTransportPos.beats_per_minute;
			if ( m_transport.m_nBPM != bpm ) {


				if ( Preferences::get_instance()->m_bJackMasterMode == Preferences::NO_JACK_TIME_MASTER ){
					// 					WARNINGLOG( QString( "Tempo change from jack-transport: %1" ).arg( bpm ) );
					m_transport.m_nBPM = bpm;
					must_relocate = 1; // The tempo change has happened somewhere during the previous cycle; relocate right away.

					// This commenting out is rude perhaps, but I cant't figure out what this bit is doing.
					// In any case, setting must_relocate = 1 here causes too many relocates. Jakob Lund
					/*				} else {
	 if ( m_transport.m_status == TransportInfo::STOPPED ) {
	  oldpo = H->getPatternPos();
	  must_relocate = 1;
	  //changer =1;
	 }*/

				}

				// Hydrogen::get_instance()->setBPM( m_JackTransportPos.beats_per_minute ); // unnecessary, as Song->m_BPM gets updated in audioEngine_process_transport (after calling this function)
			}
		}

		if ( m_transport.m_nFrames + bbt_frame_offset != m_JackTransportPos.frame ) {
			if ( ( m_JackTransportPos.valid & JackPositionBBT ) && must_relocate == 0 ) {
				WARNINGLOG( "Frame offset mismatch; triggering resync in 2 cycles" );
				must_relocate = 2;
			} else {
				if ( Preferences::get_instance()->m_bJackMasterMode == Preferences::NO_JACK_TIME_MASTER ) {
					// If There's no timebase_master, and audioEngine_process_checkBPMChanged handled a tempo change during last cycle, the offset doesn't match, but hopefully it was calculated correctly:

					//this perform Jakobs mod in pattern mode, but both m_transport.m_nFrames works with the same result in pattern Mode
					// in songmode the first case dont work.
					//so we can remove this "if query" and only use this old mod: m_transport.m_nFrames = H->getHumantimeFrames();
					//because to get the songmode we have to add this "H2Core::Hydrogen *m_pEngine" to the header file
					//if we remove this we also can remove *m_pEngine from header
#if 0 // dlr: fix #169, why do we have a different behaviour for SONG_MODE?
					if ( m_pEngine->getSong()->get_mode() == Song::PATTERN_MODE  ){
						m_transport.m_nFrames = m_JackTransportPos.frame/* - bbt_frame_offset*/; ///see comment in svn changeset 753
					}
					else
					{
						m_transport.m_nFrames = H->getHumantimeFrames();
					}
#else
					m_transport.m_nFrames = m_JackTransportPos.frame;
					bbt_frame_offset = 0; // dlr: stop re-syncing in every cycle when STOPPED
#endif
					// In jack 'slave' mode, if there's no master, the following line is needed to be able to relocate by clicking the song ruler (wierd corner case, but still...)
					if ( m_transport.m_status == TransportInfo::ROLLING )
						H->triggerRelocateDuringPlay();
				} else {
					///this is experimantal... but it works for the moment... fix me fix :-) wolke
					// ... will this actually happen? keeping it for now ( jakob lund )
					m_transport.m_nFrames = H->getHumantimeFrames();
//.........这里部分代码省略.........

//.........这里部分代码省略.........

	case JackTransportStarting: // Waiting for sync ready. If
				    // there are slow-sync clients,
				    // this can take more than one
				    // cycle.
		m_transport.m_status = TransportInfo::STOPPED;
		//INFOLOG( "[updateTransportInfo] STARTING (stopped) - frames: " + to_string(m_transportPos.frame) );
		break;
		
	default:
		ERRORLOG( "Unknown jack transport state" );
	}

	// Updating TickSize and BPM
	Hydrogen * H = Hydrogen::get_instance();
	// JACK may have re-located us anywhere. Therefore, we have to
	// check for a bpm change every cycle. We will do so by
	// updating both the global speed of the song, as well as the
	// fallback speed (H->getNewBpmJTM) with the local tempo at
	// the current position on the timeline.
	H->setTimelineBpm(); 

	// Check whether another JACK master is present (the second if
	// clause won't evaluate to true if Hydrogen itself is the
	// timebase master) and whether it changed the transport
	// state. Note that only the JACK timebase master and not
	// arbitrary clients can do this. If so, the speed is updated
	// an a relocation according to the bar, beat, and tick
	// information will be triggered right away.
	if ( m_JackTransportPos.valid & JackPositionBBT ) {
		float bpm = ( float )m_JackTransportPos.beats_per_minute;
		if ( m_transport.m_nBPM != bpm ) {
			if ( Preferences::get_instance()->m_bJackMasterMode ==
			     Preferences::NO_JACK_TIME_MASTER ){
				// WARNINGLOG( QString( "Tempo change from jack-transport: %1" ).arg( bpm ) );
				m_transport.m_nBPM = bpm;
				must_relocate = 1; 
			}
		}
	}

        // This clause detects a re-location, which was either
        // triggered by an user-interaction (e.g. clicking the forward
        // button or clicking somewhere on the timeline) or by a
        // different JACK client.
	if ( m_transport.m_nFrames + bbt_frame_offset != m_JackTransportPos.frame ) {
		// Whether there is a JACK timebase master registered
		// but the audio engine was neither (re)started nor a
		// change in the speed was found beforehand.
		if ( ( m_JackTransportPos.valid & JackPositionBBT ) && must_relocate == 0 ) {
			// WARNINGLOG( "Frame offset mismatch; triggering resync in 2 cycles" );
			must_relocate = 2; // re-locate at the end of
					   // the next cycle.
		} else {
			if ( Preferences::get_instance()->m_bJackMasterMode ==
			     Preferences::NO_JACK_TIME_MASTER ) {
				// Just consider the transport
				// position as dirty, reassign the
				// one obtained in the query, and
				// reset the offset.
				m_transport.m_nFrames = m_JackTransportPos.frame;
				bbt_frame_offset = 0;
				// If not registered as JACK time
				// master, the following line is
				// needed to be able to relocate by
				// clicking the song ruler (wired
				// corner case, but still...)
				if ( m_transport.m_status == TransportInfo::ROLLING )
					// Setting
					// H->m_nPatternStartTick = -1
					// if in pattern mode.
					H->triggerRelocateDuringPlay();
			} else {
			        // Fallback to the transport position
			        // of the last cycle.
				m_transport.m_nFrames = H->getHumantimeFrames();
			}
		}
	}
	// Only used if Hydrogen is in JACK timebase master
	// mode. Updated every cycle.
	if ( H->getHumantimeFrames() != m_JackTransportPos.frame ) {
		H->setHumantimeFrames(m_JackTransportPos.frame);
		// WARNINGLOG( QString( "fix Humantime: %1" ).arg( m_JackTransportPos.frame ) );
	}

	// Trigger the re-location based on the information provided
	// by another JACK timebase master.
	if ( must_relocate == 1 ) {
		WARNINGLOG( QString( "Resyncing! bbt_frame_offset: %1" ).arg( bbt_frame_offset ) );
		relocateBBT();
		if ( m_transport.m_status == TransportInfo::ROLLING ) {
			// Setting H->m_nPatternStartTick = -1 if in
			// pattern mode
			H->triggerRelocateDuringPlay();
		}
	}
	
	if ( must_relocate > 0 ) must_relocate--;
}