hvirtual/cinelerra/edl.C

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#include "asset.h"
#include "assets.h"
#include "atrack.h"
#include "autoconf.h"
#include "automation.h"
#include "awindowgui.inc"
#include "bcsignals.h"
#include "clip.h"
#include "colormodels.h"
#include "bchash.h"
#include "edl.h"
#include "edlsession.h"
#include "filexml.h"
#include "guicast.h"
#include "labels.h"
#include "localsession.h"
#include "mutex.h"
#include "panauto.h"
#include "panautos.h"
#include "playbackconfig.h"
#include "plugin.h"
#include "preferences.h"
#include "recordconfig.h"
#include "recordlabel.h"
#include "sharedlocation.h"
#include "theme.h"
#include "tracks.h"
#include "transportque.inc"
#include "vtrack.h"




Mutex* EDL::id_lock = 0;



EDL::EDL(EDL *parent_edl)
{
        this->parent_edl = parent_edl;
        tracks = 0;
        labels = 0;
        local_session = 0;
        vwindow_edl = 0;
        vwindow_edl_shared = 0;


        folders.set_array_delete();

        new_folder(CLIP_FOLDER);

        new_folder(MEDIA_FOLDER);

        id = next_id();
        project_path[0] = 0;
}


EDL::~EDL()
{

        if(tracks)
        {
                delete tracks;
        }
        if(labels)
        {
                delete labels;
        }

        if(local_session)
        {
                delete local_session;
        }

        if(vwindow_edl && !vwindow_edl_shared)
                delete vwindow_edl;

        if(!parent_edl)
        {
                delete assets;
                delete session;
        }


        folders.remove_all_objects();
        clips.remove_all_objects();
}


int EDL::create_objects()
{
        tracks = new Tracks(this);
        if(!parent_edl)
        {
                assets = new Assets(this);
                session = new EDLSession(this);
        }
        else
        {
                assets = parent_edl->assets;
                session = parent_edl->session;
        }
        
        local_session = new LocalSession(this);
        labels = new Labels(this, "LABELS");
//      last_playback_position = 0;
        return 0;
}

EDL& EDL::operator=(EDL &edl)
{
printf("EDL::operator= 1\n");
        copy_all(&edl);
        return *this;
}

int EDL::load_defaults(BC_Hash *defaults)
{
        if(!parent_edl)
                session->load_defaults(defaults);

        local_session->load_defaults(defaults);
        return 0;
}

int EDL::save_defaults(BC_Hash *defaults)
{
        if(!parent_edl)
                session->save_defaults(defaults);
        
        local_session->save_defaults(defaults);
        return 0;
}

void EDL::boundaries()
{
        session->boundaries();
        local_session->boundaries();
}

int EDL::create_default_tracks()
{

        for(int i = 0; i < session->video_tracks; i++)
        {
                tracks->add_video_track(0, 0);
        }
        for(int i = 0; i < session->audio_tracks; i++)
        {
                tracks->add_audio_track(0, 0);
        }
        return 0;
}

int EDL::load_xml(ArrayList<PluginServer*> *plugindb,
        FileXML *file, 
        uint32_t load_flags)
{
        int result = 0;
// Track numbering offset for replacing undo data.
        int track_offset = 0;


        folders.remove_all_objects();

// Search for start of master EDL.

// The parent_edl test caused clip creation to fail since those XML files
// contained an EDL tag.

// The parent_edl test is required to make EDL loading work because
// when loading an EDL the EDL tag is already read by the parent.

        if(!parent_edl)
        {
                do{
                  result = file->read_tag();
                }while(!result && 
                        !file->tag.title_is("XML") && 
                        !file->tag.title_is("EDL"));
        }

        if(!result)
        {
// Get path for backups
                project_path[0] = 0;
                file->tag.get_property("PROJECT_PATH", project_path);

// Erase everything
                if((load_flags & LOAD_ALL) == LOAD_ALL ||
                        (load_flags & LOAD_EDITS) == LOAD_EDITS)
                {
                        while(tracks->last) delete tracks->last;
                }

                if((load_flags & LOAD_ALL) == LOAD_ALL)
                {
                        clips.remove_all_objects();
                }

                if(load_flags & LOAD_TIMEBAR)
                {
                        while(labels->last) delete labels->last;
                        local_session->unset_inpoint();
                        local_session->unset_outpoint();
                }

                do{
                        result = file->read_tag();

                        if(!result)
                        {
                                if(file->tag.title_is("/XML") ||
                                        file->tag.title_is("/EDL") ||
                                        file->tag.title_is("/CLIP_EDL") ||
                                        file->tag.title_is("/VWINDOW_EDL"))
                                {
                                        result = 1;
                                }
                                else
                                if(file->tag.title_is("CLIPBOARD"))
                                {
                                        local_session->clipboard_length = file->tag.get_property("LENGTH", 0);
                                }
                                else
                                if(file->tag.title_is("VIDEO"))
                                {
                                        if((load_flags & LOAD_VCONFIG) &&
                                                (load_flags & LOAD_SESSION))
                                                session->load_video_config(file, 0, load_flags);
                                }
                                else
                                if(file->tag.title_is("AUDIO"))
                                {
                                        if((load_flags & LOAD_ACONFIG) &&
                                                (load_flags & LOAD_SESSION))
                                                session->load_audio_config(file, 0, load_flags);
                                }
                                else
                                if(file->tag.title_is("FOLDER"))
                                {
                                        char folder[BCTEXTLEN];
                                        strcpy(folder, file->read_text());
                                        new_folder(folder);
                                }
                                else
                                if(file->tag.title_is("ASSETS"))
                                {
                                        if(load_flags & LOAD_ASSETS)
                                                assets->load(plugindb, file, load_flags);
                                }
                                else
                                if(file->tag.title_is(labels->xml_tag))
                                {
                                        if(load_flags & LOAD_TIMEBAR)
                                                labels->load(file, load_flags);
                                }
                                else
                                if(file->tag.title_is("LOCALSESSION"))
                                {
                                        if((load_flags & LOAD_SESSION) ||
                                                (load_flags & LOAD_TIMEBAR))
                                                local_session->load_xml(file, load_flags);
                                }
                                else
                                if(file->tag.title_is("SESSION"))
                                {
                                        if((load_flags & LOAD_SESSION) &&
                                                !parent_edl)
                                                session->load_xml(file, 0, load_flags);
                                }
                                else
                                if(file->tag.title_is("TRACK"))
                                {
                                        tracks->load(file, track_offset, load_flags);
                                }
                                else
// Sub EDL.
// Causes clip creation to fail because that involves an opening EDL tag.
                                if(file->tag.title_is("CLIP_EDL") && !parent_edl)
                                {
                                        EDL *new_edl = new EDL(this);
                                        new_edl->create_objects();
                                        new_edl->load_xml(plugindb, file, LOAD_ALL);

                                        if((load_flags & LOAD_ALL) == LOAD_ALL)
                                                clips.append(new_edl);
                                        else
                                                delete new_edl;
                                }
                                else
                                if(file->tag.title_is("VWINDOW_EDL") && !parent_edl)
                                {
                                        EDL *new_edl = new EDL(this);
                                        new_edl->create_objects();
                                        new_edl->load_xml(plugindb, file, LOAD_ALL);


                                        if((load_flags & LOAD_ALL) == LOAD_ALL)
                                        {
                                                if(vwindow_edl && !vwindow_edl_shared) delete vwindow_edl;
                                                vwindow_edl = new_edl;
                                                vwindow_edl_shared = 0;
                                        }
                                        else
                                        {
                                                delete new_edl;
                                                new_edl = 0;
                                        }
                                }
                        }
                }while(!result);
        }
        boundaries();
//dump();

        return 0;
}

// Output path is the path of the output file if name truncation is desired.
// It is a "" if complete names should be used.
// Called recursively by copy for clips, thus the string can't be terminated.
// The string is not terminated in this call.
int EDL::save_xml(ArrayList<PluginServer*> *plugindb,
        FileXML *file, 
        char *output_path,
        int is_clip,
        int is_vwindow)
{
        copy(0, 
                tracks->total_length(), 
                1, 
                is_clip,
                is_vwindow,
                file, 
                plugindb, 
                output_path,
                0);
        return 0;
}

int EDL::copy_all(EDL *edl)
{
        copy_session(edl);
        copy_assets(edl);
        copy_clips(edl);
        tracks->copy_from(edl->tracks);
        labels->copy_from(edl->labels);
        return 0;
}

void EDL::copy_clips(EDL *edl)
{
        if(vwindow_edl && !vwindow_edl_shared) delete vwindow_edl;
        vwindow_edl = 0;
        vwindow_edl_shared = 0;
        if(edl->vwindow_edl)
        {
                vwindow_edl = new EDL(this);
                vwindow_edl->create_objects();
                vwindow_edl->copy_all(edl->vwindow_edl);
        }
        clips.remove_all_objects();
        for(int i = 0; i < edl->clips.total; i++)
        {
                add_clip(edl->clips.values[i]);
        }
}

void EDL::copy_assets(EDL *edl)
{
        if(!parent_edl)
        {
                assets->copy_from(edl->assets);
        }
}

void EDL::copy_session(EDL *edl, int session_only)
{
        if(!session_only)
        {
                strcpy(this->project_path, edl->project_path);

                folders.remove_all_objects();
                for(int i = 0; i < edl->folders.total; i++)
                {
                        char *new_folder;
                        folders.append(new_folder = new char[strlen(edl->folders.values[i]) + 1]);
                        strcpy(new_folder, edl->folders.values[i]);
                }
        }

        if(!parent_edl)
        {
                session->copy(edl->session);
        }

        if(!session_only)
        {
                local_session->copy_from(edl->local_session);
        }
}

int EDL::copy_assets(double start, 
        double end, 
        FileXML *file, 
        int all, 
        ArrayList<PluginServer*> *plugindb,
        char *output_path)
{
        ArrayList<Asset*> asset_list;
        Track* current;

        file->tag.set_title("ASSETS");
        file->append_tag();
        file->append_newline();

// Copy everything for a save
        if(all)
        {
                for(Asset *asset = assets->first;
                        asset;
                        asset = asset->next)
                {
                        asset_list.append(asset);
                }
        }
        else
// Copy just the ones being used.
        {
                for(current = tracks->first; 
                        current; 
                        current = NEXT)
                {
                        if(current->record)
                        {
                                current->copy_assets(start, 
                                        end, 
                                        &asset_list);
                        }
                }
        }

// Paths relativised here
        for(int i = 0; i < asset_list.total; i++)
        {
                asset_list.values[i]->write(file, 
                        0, 
                        output_path);
        }

        file->tag.set_title("/ASSETS");
        file->append_tag();
        file->append_newline();
        file->append_newline();
        return 0;
}

int EDL::copy(double start, 
        double end, 
        int all, 
        int is_clip,
        int is_vwindow,
        FileXML *file, 
        ArrayList<PluginServer*> *plugindb, 
        char *output_path,
        int rewind_it)
{
//printf("EDL::copy 1\n");
// begin file
        if(is_clip)
                file->tag.set_title("CLIP_EDL");
        else
        if(is_vwindow)
                file->tag.set_title("VWINDOW_EDL");
        else
        {
                file->tag.set_title("EDL");
                file->tag.set_property("VERSION", CINELERRA_VERSION);
// Save path for restoration of the project title from a backup.
                if(this->project_path[0])
                {
                        file->tag.set_property("PROJECT_PATH", project_path);
                }
        }

        file->append_tag();
        file->append_newline();

// Set clipboard samples only if copying to clipboard
        if(!all)
        {
                file->tag.set_title("CLIPBOARD");
                file->tag.set_property("LENGTH", end - start);
                file->append_tag();
                file->tag.set_title("/CLIPBOARD");
                file->append_tag();
                file->append_newline();
                file->append_newline();
        }
//printf("EDL::copy 1\n");

// Sessions
        local_session->save_xml(file, start);

//printf("EDL::copy 1\n");

// Top level stuff.
//      if(!parent_edl)
        {
// Need to copy all this from child EDL if pasting is desired.
// Session
                session->save_xml(file);
                session->save_video_config(file);
                session->save_audio_config(file);

// Folders
                for(int i = 0; i < folders.total; i++)
                {
                        file->tag.set_title("FOLDER");
                        file->append_tag();
                        file->append_text(folders.values[i]);
                        file->tag.set_title("/FOLDER");
                        file->append_tag();
                        file->append_newline();
                }

// Media
// Don't replicate all assets for every clip.
// The assets for the clips are probably in the mane EDL.
                if(!is_clip)
                        copy_assets(start, 
                                end, 
                                file, 
                                all, 
                                plugindb,
                                output_path);

// Clips
// Don't want this if using clipboard
                if(all)
                {
                        if(vwindow_edl)
                        {
                                
                                vwindow_edl->save_xml(plugindb, 
                                        file, 
                                        output_path,
                                        0,
                                        1);
                        }

                        for(int i = 0; i < clips.total; i++)
                                clips.values[i]->save_xml(plugindb, 
                                        file, 
                                        output_path,
                                        1,
                                        0);
                }

                file->append_newline();
                file->append_newline();
        }


//printf("EDL::copy 1\n");

        labels->copy(start, end, file);
//printf("EDL::copy 1\n");
        tracks->copy(start, end, all, file, output_path);
//printf("EDL::copy 2\n");

// terminate file
        if(is_clip)
                file->tag.set_title("/CLIP_EDL");
        else
        if(is_vwindow)
                file->tag.set_title("/VWINDOW_EDL");
        else
                file->tag.set_title("/EDL");
        file->append_tag();
        file->append_newline();


// For editing operations we want to rewind it for immediate pasting.
// For clips and saving to disk leave it alone.
        if(rewind_it)
        {
                file->terminate_string();
                file->rewind();
        }
        return 0;
}

void EDL::rechannel()
{
        for(Track *current = tracks->first; current; current = NEXT)
        {
                if(current->data_type == TRACK_AUDIO)
                {
                        PanAutos *autos = (PanAutos*)current->automation->autos[AUTOMATION_PAN];
                        ((PanAuto*)autos->default_auto)->rechannel();
                        for(PanAuto *keyframe = (PanAuto*)autos->first;
                                keyframe;
                                keyframe = (PanAuto*)keyframe->next)
                        {
                                keyframe->rechannel();
                        }
                }
        }
}

void EDL::resample(double old_rate, double new_rate, int data_type)
{
        for(Track *current = tracks->first; current; current = NEXT)
        {
                if(current->data_type == data_type)
                {
                        current->resample(old_rate, new_rate);
                }
        }
}


void EDL::synchronize_params(EDL *edl)
{
        local_session->synchronize_params(edl->local_session);
        for(Track *this_track = tracks->first, *that_track = edl->tracks->first; 
                this_track && that_track; 
                this_track = this_track->next,
                that_track = that_track->next)
        {
                this_track->synchronize_params(that_track);
        }
}

int EDL::trim_selection(double start, 
        double end,
        int edit_labels,
        int edit_plugins)
{
        if(start != end)
        {
// clear the data
                clear(0, 
                        start,
                        edit_labels,
                        edit_plugins);
                clear(end - start, 
                        tracks->total_length(),
                        edit_labels,
                        edit_plugins);
        }
        return 0;
}


int EDL::equivalent(double position1, double position2)
{
        double threshold = (double).5 / session->frame_rate;
        if(session->cursor_on_frames) 
                threshold = (double).5 / session->frame_rate;
        else
                threshold = (double)1 / session->sample_rate;

        if(fabs(position2 - position1) < threshold)
        return 1;
    else
        return 0;
}

double EDL::equivalent_output(EDL *edl)
{
        double result = -1;
        session->equivalent_output(edl->session, &result);
        tracks->equivalent_output(edl->tracks, &result);
        return result;
}


void EDL::set_project_path(char *path)
{
        strcpy(this->project_path, path);
}

void EDL::set_inpoint(double position)
{
        if(equivalent(local_session->get_inpoint(), position) && 
                local_session->get_inpoint() >= 0)
        {
                local_session->unset_inpoint();
        }
        else
        {
                local_session->set_inpoint(align_to_frame(position, 0));
                if(local_session->get_outpoint() <= local_session->get_inpoint()) 
                        local_session->unset_outpoint();
        }
}

void EDL::set_outpoint(double position)
{
        if(equivalent(local_session->get_outpoint(), position) && 
                local_session->get_outpoint() >= 0)
        {
                local_session->unset_outpoint();
        }
        else
        {
                local_session->set_outpoint(align_to_frame(position, 0));
                if(local_session->get_inpoint() >= local_session->get_outpoint()) 
                        local_session->unset_inpoint();
        }
}


int EDL::clear(double start, 
        double end, 
        int clear_labels,
        int clear_plugins)
{
        if(start == end)
        {
                double distance = 0;
                tracks->clear_handle(start, 
                        end,
                        distance, 
                        clear_labels,
                        clear_plugins);
                if(clear_labels && distance > 0)
                        labels->paste_silence(start, 
                                start + distance);
        }
        else
        {
                tracks->clear(start, 
                        end,
                        clear_plugins);
                if(clear_labels) 
                        labels->clear(start, 
                                end, 
                                1);
        }

// Need to put at beginning so a subsequent paste operation starts at the
// right position.
        double position = local_session->get_selectionstart();
        local_session->set_selectionend(position);
        local_session->set_selectionstart(position);
        return 0;
}

void EDL::modify_edithandles(double oldposition, 
        double newposition, 
        int currentend,
        int handle_mode,
        int edit_labels,
        int edit_plugins)
{
        tracks->modify_edithandles(oldposition, 
                newposition, 
                currentend,
                handle_mode,
                edit_labels, 
                edit_plugins);
        labels->modify_handles(oldposition, 
                newposition, 
                currentend,
                handle_mode,
                edit_labels);
}

void EDL::modify_pluginhandles(double oldposition, 
        double newposition, 
        int currentend, 
        int handle_mode,
        int edit_labels,
        Edits *trim_edits)
{
        tracks->modify_pluginhandles(oldposition, 
                newposition, 
                currentend, 
                handle_mode,
                edit_labels,
                trim_edits);
        optimize();
}

void EDL::paste_silence(double start, 
        double end, 
        int edit_labels, 
        int edit_plugins)
{
        if(edit_labels) 
                labels->paste_silence(start, end);
        tracks->paste_silence(start, 
                end, 
                edit_plugins);
}


void EDL::remove_from_project(ArrayList<EDL*> *clips)
{
        for(int i = 0; i < clips->total; i++)
        {
                for(int j = 0; j < this->clips.total; j++)
                {
                        if(this->clips.values[j] == clips->values[i])
                        {
                                this->clips.remove_object(clips->values[i]);
                        }
                }
        }
}

void EDL::remove_from_project(ArrayList<Asset*> *assets)
{
// Remove from clips
        if(!parent_edl)
                for(int j = 0; j < clips.total; j++)
                {
                        clips.values[j]->remove_from_project(assets);
                }

// Remove from VWindow
        if(vwindow_edl)
                vwindow_edl->remove_from_project(assets);

        for(int i = 0; i < assets->total; i++)
        {
// Remove from tracks
                for(Track *track = tracks->first; track; track = track->next)
                {
                        track->remove_asset(assets->values[i]);
                }

// Remove from assets
                if(!parent_edl)
                {
                        this->assets->remove_asset(assets->values[i]);
                }
        }
}

void EDL::update_assets(EDL *src)
{
        for(Asset *current = src->assets->first;
                current;
                current = NEXT)
        {
                assets->update(current);
        }
}

int EDL::get_tracks_height(Theme *theme)
{
        int total_pixels = 0;
        for(Track *current = tracks->first;
                current;
                current = NEXT)
        {
                total_pixels += current->vertical_span(theme);
        }
        return total_pixels;
}

int64_t EDL::get_tracks_width()
{
        int64_t total_pixels = 0;
        for(Track *current = tracks->first;
                current;
                current = NEXT)
        {
                int64_t pixels = current->horizontal_span();
                if(pixels > total_pixels) total_pixels = pixels;
        }
//printf("EDL::get_tracks_width %d\n", total_pixels);
        return total_pixels;
}

// int EDL::calculate_output_w(int single_channel)
// {
//      if(single_channel) return session->output_w;
// 
//      int widest = 0;
//      for(int i = 0; i < session->video_channels; i++)
//      {
//              if(session->vchannel_x[i] + session->output_w > widest) widest = session->vchannel_x[i] + session->output_w;
//      }
//      return widest;
// }
// 
// int EDL::calculate_output_h(int single_channel)
// {
//      if(single_channel) return session->output_h;
// 
//      int tallest = 0;
//      for(int i = 0; i < session->video_channels; i++)
//      {
//              if(session->vchannel_y[i] + session->output_h > tallest) tallest = session->vchannel_y[i] + session->output_h;
//      }
//      return tallest;
// }

// Get the total output size scaled to aspect ratio
void EDL::calculate_conformed_dimensions(int single_channel, float &w, float &h)
{
        w = session->output_w;
        h = session->output_h;

        if((float)session->output_w / session->output_h > get_aspect_ratio())
        {
                h = (float)h * 
                        (session->output_w / get_aspect_ratio() / session->output_h);
        }
        else
        {
                w = (float)w * 
                        (h * get_aspect_ratio() / session->output_w);
        }
}

float EDL::get_aspect_ratio()
{
        return session->aspect_w / session->aspect_h;
}

int EDL::dump()
{
        if(parent_edl)
                printf("CLIP\n");
        else
                printf("EDL\n");
        printf("clip_title: %s parent_edl: %p\n", local_session->clip_title, parent_edl);
        printf("selectionstart %f selectionend %f loop_start %f loop_end %f\n", 
                local_session->get_selectionstart(1), 
                local_session->get_selectionend(1),
                local_session->loop_start,
                local_session->loop_end);

        if(!parent_edl)
        {
                printf("audio_channels: %d "
                        "audio_tracks: %d \n"
                        "sample_rate: %d\n",
                        session->audio_channels,
                        session->audio_tracks,
                        session->sample_rate);
                printf("video_channels: %d "
                        "video_tracks: %d "
                        "frame_rate: %.2f "
                        "frames_per_foot: %.2f\n"
                "output_w: %d "
                "output_h: %d "
                "aspect_w: %f "
                "aspect_h %f "
                        "color_model %d\n",
                                session->video_channels,
                                session->video_tracks,
                                session->frame_rate,
                                session->frames_per_foot,
                        session->output_w,
                        session->output_h,
                        session->aspect_w,
                        session->aspect_h,
                                session->color_model);

                printf(" EDLS\n");
                printf("  total: %d\n", clips.total);
        
                for(int i = 0; i < clips.total; i++)
                {
                        printf("\n\n");
                        clips.values[i]->dump();
                        printf("\n\n");
                }

                printf(" ASSETS\n");
                assets->dump();
        }
        printf(" LABELS\n");
        labels->dump();
        printf(" TRACKS\n");
        tracks->dump();
//printf("EDL::dump 2\n");
        return 0;
}

EDL* EDL::add_clip(EDL *edl)
{
// Copy argument.  New edls are deleted from MWindow::load_filenames.
        EDL *new_edl = new EDL(this);
        new_edl->create_objects();
        new_edl->copy_all(edl);
        clips.append(new_edl);
        return new_edl;
}

void EDL::insert_asset(Asset *asset, 
        double position, 
        Track *first_track, 
        RecordLabels *labels)
{
// Insert asset into asset table
        Asset *new_asset = assets->update(asset);


// Paste video
        int vtrack = 0;
        Track *current = first_track ? first_track : tracks->first;


// Fix length of single frame
        double length;


        if(new_asset->video_length < 0) 
        {
        if(session->si_useduration)
                length = session->si_duration;
        else    
                length = 1.0 / session->frame_rate; 
        }
        else
        if(new_asset->frame_rate > 0)
                length = ((double)new_asset->video_length / new_asset->frame_rate);
        else
                length = 1.0 / session->frame_rate;

        for( ;
                current && vtrack < new_asset->layers;
                current = NEXT)
        {
                if(!current->record || 
                        current->data_type != TRACK_VIDEO)
                        continue;

                current->insert_asset(new_asset, 
                        length, 
                        position, 
                        vtrack);

                vtrack++;
        }

        int atrack = 0;
        for(current = tracks->first;
                current && atrack < new_asset->channels;
                current = NEXT)
        {
                if(!current->record ||
                        current->data_type != TRACK_AUDIO)
                        continue;

                current->insert_asset(new_asset, 
                        (double)new_asset->audio_length / 
                                new_asset->sample_rate, 
                        position, 
                        atrack);


                atrack++;
        }

        if(labels)
        {
                for(RecordLabel *label = labels->first; label; label = label->next)
                {
                        this->labels->toggle_label(label->position, label->position);
                }
        }
}



void EDL::set_index_file(Asset *asset)
{
        assets->update_index(asset);
}

void EDL::optimize()
{
//printf("EDL::optimize 1\n");
        double length = tracks->total_length();
        if(local_session->preview_end > length) local_session->preview_end = length;
        if(local_session->preview_start > length ||
                local_session->preview_start < 0) local_session->preview_start = 0;
        for(Track *current = tracks->first; current; current = NEXT)
                current->optimize();
}

int EDL::next_id()
{
        id_lock->lock("EDL::next_id");
        int result = EDLSession::current_id++;
        id_lock->unlock();
        return result;
}

void EDL::get_shared_plugins(Track *source, 
        ArrayList<SharedLocation*> *plugin_locations)
{
        for(Track *track = tracks->first; track; track = track->next)
        {
                if(track != source && 
                        track->data_type == source->data_type)
                {
                        for(int i = 0; i < track->plugin_set.total; i++)
                        {
                                Plugin *plugin = track->get_current_plugin(
                                        local_session->get_selectionstart(1), 
                                        i, 
                                        PLAY_FORWARD, 
                                        1,
                                        0);
                                if(plugin && plugin->plugin_type == PLUGIN_STANDALONE)
                                {
                                        plugin_locations->append(new SharedLocation(tracks->number_of(track), i));
                                }
                        }
                }
        }
}

void EDL::get_shared_tracks(Track *track, ArrayList<SharedLocation*> *module_locations)
{
        for(Track *current = tracks->first; current; current = NEXT)
        {
                if(current != track && 
                        current->data_type == track->data_type)
                {
                        module_locations->append(new SharedLocation(tracks->number_of(current), 0));
                }
        }
}

// Convert position to frames if cursor alignment is enabled
double EDL::align_to_frame(double position, int round)
{
//printf("EDL::align_to_frame 1 %f\n", position);
        if(session->cursor_on_frames)
        {
// Seconds -> Frames
                double temp = (double)position * session->frame_rate;
//printf("EDL::align_to_frame 2 %f\n", temp);

// Assert some things
                if(session->sample_rate == 0)
                        printf("EDL::align_to_frame: sample_rate == 0\n");

                if(session->frame_rate == 0)
                        printf("EDL::align_to_frame: frame_rate == 0\n");

// Round frames
// Always round down negative numbers
// but round up only if requested
                if(round) 
                {
                        temp = Units::round(temp);
                }
                else
                {
//                      if(temp < 0)
//                      {
//                              temp -= 0.5;
//                      }
//                      else
                                temp = Units::to_int64(temp);
                }
//printf("EDL::align_to_frame 3 %f\n", temp);

// Frames -> Seconds
                temp /= session->frame_rate;

//printf("EDL::align_to_frame 5 %f\n", temp);

                return temp;
        }
//printf("EDL::align_to_frame 3 %d\n", position);


        return position;
}


void EDL::new_folder(char *folder)
{
        for(int i = 0; i < folders.total; i++)
        {
                if(!strcasecmp(folders.values[i], folder)) return;
        }

        char *new_folder;
        folders.append(new_folder = new char[strlen(folder) + 1]);
        strcpy(new_folder, folder);
}

void EDL::delete_folder(char *folder)
{
        int i;
        for(i = 0; i < folders.total; i++)
        {
                if(!strcasecmp(folders.values[i], folder))
                {
                        break;
                }
        }

        if(i < folders.total) delete folders.values[i];

        for( ; i < folders.total - 1; i++)
        {
                folders.values[i] = folders.values[i + 1];
        }
}

---