hvirtual/plugins/loopaudio/loopaudio.C

Go to the documentation of this file.

#include "bcdisplayinfo.h"
#include "clip.h"
#include "bchash.h"
#include "filexml.h"
#include "guicast.h"
#include "language.h"
#include "pluginaclient.h"
#include "transportque.h"

#include <string.h>

class LoopAudio;

class LoopAudioConfig
{
public:
        LoopAudioConfig();
        int64_t samples;
};


class LoopAudioSamples : public BC_TextBox
{
public:
        LoopAudioSamples(LoopAudio *plugin,
                int x,
                int y);
        int handle_event();
        LoopAudio *plugin;
};

class LoopAudioWindow : public BC_Window
{
public:
        LoopAudioWindow(LoopAudio *plugin, int x, int y);
        ~LoopAudioWindow();
        void create_objects();
        int close_event();
        LoopAudio *plugin;
        LoopAudioSamples *samples;
};

PLUGIN_THREAD_HEADER(LoopAudio, LoopAudioThread, LoopAudioWindow)

class LoopAudio : public PluginAClient
{
public:
        LoopAudio(PluginServer *server);
        ~LoopAudio();

        PLUGIN_CLASS_MEMBERS(LoopAudioConfig, LoopAudioThread)

        int load_defaults();
        int save_defaults();
        void save_data(KeyFrame *keyframe);
        void read_data(KeyFrame *keyframe);
        void update_gui();
        int is_realtime();
        int is_synthesis();
        int process_buffer(int64_t size, 
                double *buffer,
                int64_t start_position,
                int sample_rate);
};







REGISTER_PLUGIN(LoopAudio);



LoopAudioConfig::LoopAudioConfig()
{
        samples = 48000;
}





LoopAudioWindow::LoopAudioWindow(LoopAudio *plugin, int x, int y)
 : BC_Window(plugin->gui_string, 
        x, 
        y, 
        210, 
        160, 
        200, 
        160, 
        0, 
        0,
        1)
{
        this->plugin = plugin;
}

LoopAudioWindow::~LoopAudioWindow()
{
}

void LoopAudioWindow::create_objects()
{
        int x = 10, y = 10;

        add_subwindow(new BC_Title(x, y, _("Samples to loop:")));
        y += 20;
        add_subwindow(samples = new LoopAudioSamples(plugin, 
                x, 
                y));
        show_window();
        flush();
}

WINDOW_CLOSE_EVENT(LoopAudioWindow)


PLUGIN_THREAD_OBJECT(LoopAudio, LoopAudioThread, LoopAudioWindow)






LoopAudioSamples::LoopAudioSamples(LoopAudio *plugin, 
        int x, 
        int y)
 : BC_TextBox(x, 
        y, 
        100,
        1,
        plugin->config.samples)
{
        this->plugin = plugin;
        set_precision(2);
}

int LoopAudioSamples::handle_event()
{
        plugin->config.samples = atol(get_text());
        plugin->config.samples = MAX(1, plugin->config.samples);
        plugin->send_configure_change();
        return 1;
}









LoopAudio::LoopAudio(PluginServer *server)
 : PluginAClient(server)
{
        PLUGIN_CONSTRUCTOR_MACRO
}


LoopAudio::~LoopAudio()
{
        PLUGIN_DESTRUCTOR_MACRO
}

char* LoopAudio::plugin_title() { return N_("Loop audio"); }
int LoopAudio::is_realtime() { return 1; } 
int LoopAudio::is_synthesis() { return 1; }


#include "picon_png.h"
NEW_PICON_MACRO(LoopAudio)

SHOW_GUI_MACRO(LoopAudio, LoopAudioThread)

RAISE_WINDOW_MACRO(LoopAudio)

SET_STRING_MACRO(LoopAudio);


int LoopAudio::process_buffer(int64_t size, 
        double *buffer,
        int64_t start_position,
        int sample_rate)
{
        int64_t current_position = start_position;
        int step = (get_direction() == PLAY_FORWARD) ? 1 : -1;
        int fragment_size;
        int64_t current_loop_end;

//printf("LoopAudio::process_buffer 1 %lld %d\n", start_position, size);

        current_position = start_position;

        for(int i = 0; i < size; i += fragment_size)
        {
// Truncate to end of buffer
                fragment_size = MIN(size - i, size);

                int64_t current_loop_position;

// Truncate to next keyframe
                if(get_direction() == PLAY_FORWARD)
                {
                        KeyFrame *next_keyframe = get_next_keyframe(current_position);
                        int64_t next_position = edl_to_local(next_keyframe->position);
                        if(next_position > current_position)
                                fragment_size = MIN(fragment_size, next_position - current_position);

// Get start of current loop
                        KeyFrame *prev_keyframe = get_prev_keyframe(current_position);
                        int64_t prev_position = edl_to_local(prev_keyframe->position);
                        if(prev_position == 0)
                                prev_position = get_source_start();
                        read_data(prev_keyframe);

// Get start of fragment in current loop
                        current_loop_position = prev_position +
                                ((current_position - prev_position) % 
                                        config.samples);
                        while(current_loop_position < prev_position) current_loop_position += config.samples;
                        while(current_loop_position >= prev_position + config.samples) current_loop_position -= config.samples;

// Truncate fragment to end of loop
                        current_loop_end = current_position - 
                                current_loop_position +
                                prev_position + 
                                config.samples;
                        fragment_size = MIN(current_loop_end - current_position,
                                fragment_size);
                }
                else
                {
                        KeyFrame *next_keyframe = get_prev_keyframe(current_position);
                        int64_t next_position = edl_to_local(next_keyframe->position);
                        if(next_position < current_position)
                                fragment_size = MIN(fragment_size, current_position - next_position);

                        KeyFrame *prev_keyframe = get_next_keyframe(current_position);
                        int64_t prev_position = edl_to_local(prev_keyframe->position);
                        if(prev_position == 0)
                                prev_position = get_source_start() + get_total_len();
                        read_data(prev_keyframe);

                        current_loop_position = prev_position - 
                                ((prev_position - current_position) %
                                          config.samples);
                        while(current_loop_position <= prev_position - config.samples) current_loop_position += config.samples;
                        while(current_loop_position > prev_position) current_loop_position -= config.samples;

// Truncate fragment to end of loop
                        current_loop_end = current_position + 
                                prev_position -
                                current_loop_position -
                                config.samples;
                        fragment_size = MIN(current_position - current_loop_end,
                                fragment_size);
                }


// printf("LoopAudio::process_buffer 100 %lld %lld %lld %d\n", 
// current_position, current_loop_position, current_loop_end, fragment_size);
                read_samples(buffer + i,
                        0,
                        sample_rate,
                        current_loop_position,
                        fragment_size);


                current_position += step * fragment_size;
        }
        

        return 0;
}




int LoopAudio::load_configuration()
{
        KeyFrame *prev_keyframe;
        int64_t old_samples = config.samples;
        prev_keyframe = get_prev_keyframe(get_source_position());
        read_data(prev_keyframe);
        return old_samples != config.samples;
}

int LoopAudio::load_defaults()
{
        char directory[BCTEXTLEN];
// set the default directory
        sprintf(directory, "%sloopaudio.rc", BCASTDIR);

// load the defaults
        defaults = new BC_Hash(directory);
        defaults->load();

        config.samples = defaults->get("SAMPLES", config.samples);
        return 0;
}

int LoopAudio::save_defaults()
{
        defaults->update("SAMPLES", config.samples);
        defaults->save();
        return 0;
}

void LoopAudio::save_data(KeyFrame *keyframe)
{
        FileXML output;

// cause data to be stored directly in text
        output.set_shared_string(keyframe->data, MESSAGESIZE);
        output.tag.set_title("LOOPAUDIO");
        output.tag.set_property("SAMPLES", config.samples);
        output.append_tag();
        output.tag.set_title("/LOOPAUDIO");
        output.append_tag();
        output.terminate_string();
}

void LoopAudio::read_data(KeyFrame *keyframe)
{
        FileXML input;

        input.set_shared_string(keyframe->data, strlen(keyframe->data));

        int result = 0;

        while(!input.read_tag())
        {
                if(input.tag.title_is("LOOPAUDIO"))
                {
                        config.samples = input.tag.get_property("SAMPLES", config.samples);
                }
        }
}

void LoopAudio::update_gui()
{
        if(thread)
        {
                load_configuration();
                thread->window->lock_window();
                thread->window->samples->update(config.samples);
                thread->window->unlock_window();
        }
}

---