hvirtual/plugins/reverseaudio/reverseaudio.C

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

#include <string.h>

class ReverseAudio;

class ReverseAudioConfig
{
public:
        ReverseAudioConfig();
        int enabled;
};


class ReverseAudioEnabled : public BC_CheckBox
{
public:
        ReverseAudioEnabled(ReverseAudio *plugin,
                int x,
                int y);
        int handle_event();
        ReverseAudio *plugin;
};

class ReverseAudioWindow : public BC_Window
{
public:
        ReverseAudioWindow(ReverseAudio *plugin, int x, int y);
        ~ReverseAudioWindow();
        void create_objects();
        int close_event();
        ReverseAudio *plugin;
        ReverseAudioEnabled *enabled;
};

PLUGIN_THREAD_HEADER(ReverseAudio, ReverseAudioThread, ReverseAudioWindow)

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

        PLUGIN_CLASS_MEMBERS(ReverseAudioConfig, ReverseAudioThread)

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

        int64_t input_position;
        int fragment_size;
};







REGISTER_PLUGIN(ReverseAudio);



ReverseAudioConfig::ReverseAudioConfig()
{
        enabled = 1;
}





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

ReverseAudioWindow::~ReverseAudioWindow()
{
}

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

        add_subwindow(enabled = new ReverseAudioEnabled(plugin, 
                x, 
                y));
        show_window();
        flush();
}

WINDOW_CLOSE_EVENT(ReverseAudioWindow)


PLUGIN_THREAD_OBJECT(ReverseAudio, ReverseAudioThread, ReverseAudioWindow)






ReverseAudioEnabled::ReverseAudioEnabled(ReverseAudio *plugin, 
        int x, 
        int y)
 : BC_CheckBox(x, 
        y, 
        plugin->config.enabled,
        _("Enabled"))
{
        this->plugin = plugin;
}

int ReverseAudioEnabled::handle_event()
{
        plugin->config.enabled = get_value();
        plugin->send_configure_change();
        return 1;
}









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


ReverseAudio::~ReverseAudio()
{
        PLUGIN_DESTRUCTOR_MACRO
}

char* ReverseAudio::plugin_title() { return N_("Reverse audio"); }
int ReverseAudio::is_realtime() { return 1; }

#include "picon_png.h"
NEW_PICON_MACRO(ReverseAudio)

SHOW_GUI_MACRO(ReverseAudio, ReverseAudioThread)

RAISE_WINDOW_MACRO(ReverseAudio)

SET_STRING_MACRO(ReverseAudio);


int ReverseAudio::process_buffer(int64_t size, 
        double *buffer,
        int64_t start_position,
        int sample_rate)
{
        for(int i = 0; i < size; i += fragment_size)
        {
                fragment_size = size - i;
                load_configuration();
                if(config.enabled)
                {
                        read_samples(buffer + i,
                                0,
                                sample_rate,
                                input_position,
                                fragment_size);
                        for(int start = i, end = i + fragment_size - 1;
                                end > start; 
                                start++, end--)
                        {
                                double temp = buffer[start];
                                buffer[start] = buffer[end];
                                buffer[end] = temp;
                        }
                }
                else
                        read_samples(buffer + i,
                                0,
                                sample_rate,
                                start_position,
                                fragment_size);
                if(get_direction() == PLAY_FORWARD)
                        start_position += fragment_size;
                else
                        start_position -= fragment_size;
        }
        

        return 0;
}




int ReverseAudio::load_configuration()
{
        KeyFrame *prev_keyframe, *next_keyframe;
        next_keyframe = get_next_keyframe(get_source_position());
        prev_keyframe = get_prev_keyframe(get_source_position());
        read_data(next_keyframe);
// Previous keyframe stays in config object.
        read_data(prev_keyframe);

        int64_t prev_position = edl_to_local(prev_keyframe->position);
        int64_t next_position = edl_to_local(next_keyframe->position);

// printf("ReverseAudio::load_configuration 1 %lld %lld %lld %lld\n", 
// prev_position,
// next_position,
// prev_keyframe->position, 
// next_keyframe->position);
// Defeat default keyframe
        if(prev_position == 0 && next_position == 0) 
        {
                next_position = prev_position = get_source_start();
        }

// Get range to flip in requested rate
        int64_t range_start = prev_position;
        int64_t range_end = next_position;

// Between keyframe and edge of range or no keyframes
        if(range_start == range_end)
        {
// Between first keyframe and start of effect
                if(get_source_position() >= get_source_start() &&
                        get_source_position() < range_start)
                {
                        range_start = get_source_start();
                }
                else
// Between last keyframe and end of effect
                if(get_source_position() >= range_start &&
                        get_source_position() < get_source_start() + get_total_len())
                {
                        range_end = get_source_start() + get_total_len();
                }
                else
                {
// Should never get here
                        ;
                }
        }

// Convert start position to new direction
        if(get_direction() == PLAY_FORWARD)
        {
// Truncate next buffer to keyframe
                if(range_end - get_source_position() < fragment_size)
                        fragment_size = range_end - get_source_position();
                input_position = get_source_position() - range_start;
                input_position = range_end - input_position - fragment_size;
        }
        else
        {
                if(get_source_position() - range_start < fragment_size)
                        fragment_size = get_source_position() - range_start;
                input_position = range_end - get_source_position();
                input_position = range_start + input_position + fragment_size;
        }
// printf("ReverseAudio::load_configuration 20 start=%lld end=%lld current=%lld input=%lld\n", 
// range_start, 
// range_end, 
// get_source_position(),
// input_position);

        return 0;
}

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

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

        config.enabled = defaults->get("ENABLED", config.enabled);
        return 0;
}

int ReverseAudio::save_defaults()
{
        defaults->update("ENABLED", config.enabled);
        defaults->save();
        return 0;
}

void ReverseAudio::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("REVERSEAUDIO");
        output.tag.set_property("ENABLED", config.enabled);
        output.append_tag();
        output.tag.set_title("/REVERSEAUDIO");
        output.append_tag();
        output.terminate_string();
}

void ReverseAudio::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("REVERSEAUDIO"))
                {
                        config.enabled = input.tag.get_property("ENABLED", config.enabled);
                }
        }
}

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

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