playbackengine.h

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#ifndef PLAYBACKENGINE_H
#define PLAYBACKENGINE_H

#include "arraylist.h"
#include "audiodevice.inc"
#include "cache.inc"
#include "canvas.inc"
#include "channeldb.inc"
#include "condition.inc"
#include "defaults.inc"
#include "edl.inc"
#include "mwindow.inc"
#include "maxchannels.h"
#include "mutex.inc"
#include "tracking.inc"
#include "preferences.inc"
#include "renderengine.inc"
#include "thread.h"
#include "bctimer.h"
#include "transportque.inc"
#include "videodevice.inc"

class PlaybackEngine : public Thread
{
public:
        PlaybackEngine(MWindow *mwindow, Canvas *output);
        virtual ~PlaybackEngine();

        int create_objects();
        virtual int create_render_engine();
        void delete_render_engine();
        void arm_render_engine();
        void start_render_engine();
        void wait_render_engine();
        void create_cache();
        void perform_change();
        void sync_parameters(EDL *edl);
// Set wait_tracking for events that change the cursor location but
// be sure to unlock the windows
        void interrupt_playback(int wait_tracking = 0);
// Get levels for tracking.  Return 0 if no audio.
        int get_output_levels(double *levels, long position);
        int get_module_levels(ArrayList<double> *module_levels, long position);
// The MWindow starts the playback cursor loop
// The other windows start a slider loop
// For pausing only the cursor is run
        virtual void init_cursor();
        virtual void stop_cursor();
        virtual int brender_available(long position);
// For normal playback tracking and the cursor are started
        virtual void init_tracking();
        virtual void stop_tracking();
// The playback cursor calls this to calculate the current tracking position
        virtual double get_tracking_position();
// Reset the transport after completion
        virtual void update_transport(int command, int paused);
// The render engines call this to update tracking variables in the playback engine.
        void update_tracking(double position);
// Get the output channel table for the current device or 0 if none exists.
        ChannelDB* get_channeldb();

        void run();

// Maintain caches through console changes
        CICache *audio_cache, *video_cache;
// Maintain playback cursor on GUI
        int tracking_active;
// Tracking variables updated by render engines
        double tracking_position;
// Not accurate until the first update_tracking, at which time
// tracking_active is incremented to 2.
        Timer tracking_timer;
// Lock access to tracking data
        Mutex *tracking_lock;
// Block returns until tracking loop is finished
        Condition *tracking_done;
// Pause the main loop for the PAUSE command
        Condition *pause_lock;
// Wait until thread has started
        Condition *start_lock;

        MWindow *mwindow;
        Canvas *output;
// Copy of main preferences
        Preferences *preferences;
// Next command
        TransportQue *que;
// Currently executing command
        TransportCommand *command;
// Last command which affected transport
        int last_command;
        int done;
        int do_cwindow;
// Render engine
        RenderEngine *render_engine;

// Used by label commands to get current position
        int is_playing_back;

// General purpose debugging register
        int debug;
};





#endif

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