hvirtual/cinelerra/asset.C

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#include "asset.h"
#include "assets.h"
#include "bchash.h"
#include "bcsignals.h"
#include "clip.h"
#include "edl.h"
#include "file.h"
#include "filesystem.h"
#include "filexml.h"
#include "quicktime.h"
#include "interlacemodes.h"


#include <stdio.h>
#include <string.h>


Asset::Asset()
 : ListItem<Asset>(), GarbageObject("Asset")
{
        init_values();
}

Asset::Asset(Asset &asset)
 : ListItem<Asset>(), GarbageObject("Asset")
{
        init_values();
        *this = asset;
}

Asset::Asset(const char *path)
 : ListItem<Asset>(), GarbageObject("Asset")
{
        init_values();
        strcpy(this->path, path);
}

Asset::Asset(const int plugin_type, const char *plugin_title)
 : ListItem<Asset>(), GarbageObject("Asset")
{
        init_values();
}

Asset::~Asset()
{
        delete [] index_offsets;
        delete [] index_sizes;
// Don't delete index buffer since it is shared with the index thread.
}


int Asset::init_values()
{
        path[0] = 0;
        strcpy(folder, MEDIA_FOLDER);
//      format = FILE_MOV;
// Has to be unknown for file probing to succeed
        format = FILE_UNKNOWN;
        channels = 0;
        sample_rate = 0;
        bits = 0;
        byte_order = 0;
        signed_ = 0;
        header = 0;
        dither = 0;
        audio_data = 0;
        video_data = 0;
        audio_length = 0;
        video_length = 0;

        layers = 0;
        frame_rate = 0;
        width = 0;
        height = 0;
        strcpy(vcodec, QUICKTIME_YUV2);
        strcpy(acodec, QUICKTIME_TWOS);
        jpeg_quality = 100;
        aspect_ratio = -1;
        interlace_autofixoption = BC_ILACE_AUTOFIXOPTION_AUTO;
        interlace_mode = BC_ILACE_MODE_UNDETECTED;
        interlace_fixmethod = BC_ILACE_FIXMETHOD_NONE;

        ampeg_bitrate = 256;
        ampeg_derivative = 3;

        vorbis_vbr = 0;
        vorbis_min_bitrate = -1;
        vorbis_bitrate = 128000;
        vorbis_max_bitrate = -1;

        theora_fix_bitrate = 1;
        theora_bitrate = 860000;
        theora_quality = 16;
        theora_sharpness = 2;
        theora_keyframe_frequency = 64;
        theora_keyframe_force_frequency = 64;

        mp3_bitrate = 256000;


        mp4a_bitrate = 256000;
        mp4a_quantqual = 100;



// mpeg parameters
        vmpeg_iframe_distance = 45;
        vmpeg_pframe_distance = 0;
        vmpeg_progressive = 0;
        vmpeg_denoise = 1;
        vmpeg_bitrate = 1000000;
        vmpeg_derivative = 1;
        vmpeg_quantization = 15;
        vmpeg_cmodel = 0;
        vmpeg_fix_bitrate = 0;
        vmpeg_seq_codes = 0;
        vmpeg_preset = 0;
        vmpeg_field_order = 0;

// Divx parameters.  BC_Hash from encore2
        divx_bitrate = 2000000;
        divx_rc_period = 50;
        divx_rc_reaction_ratio = 45;
        divx_rc_reaction_period = 10;
        divx_max_key_interval = 250;
        divx_max_quantizer = 31;
        divx_min_quantizer = 1;
        divx_quantizer = 5;
        divx_quality = 5;
        divx_fix_bitrate = 1;
        divx_use_deblocking = 1;

        h264_bitrate = 2000000;
        h264_quantizer = 5;
        h264_fix_bitrate = 0;

        ms_bitrate = 1000000;
        ms_bitrate_tolerance = 500000;
        ms_quantization = 10;
        ms_interlaced = 0;
        ms_gop_size = 45;
        ms_fix_bitrate = 1;

        ac3_bitrate = 128;

        png_use_alpha = 0;
        exr_use_alpha = 0;
        exr_compression = 0;

        tiff_cmodel = 0;
        tiff_compression = 0;

        use_header = 1;


        reset_index();
        id = EDL::next_id();

        pipe[0] = 0;
        use_pipe = 0;

        reset_timecode();

        return 0;
}

int Asset::reset_index()
{
        index_status = INDEX_NOTTESTED;
        index_start = old_index_end = index_end = 0;
        index_offsets = 0;
        index_sizes = 0;
        index_zoom = 0;
        index_bytes = 0;
        index_buffer = 0;
        return 0;
}

int Asset::reset_timecode()
{
        strcpy(reel_name, "cin0000");
        reel_number = 0;
        tcstart = 0;
        tcend = 0;
        tcformat = 0;
        
        return 0;
}

void Asset::copy_from(Asset *asset, int do_index)
{
        copy_location(asset);
        copy_format(asset, do_index);
}

void Asset::copy_location(Asset *asset)
{
        strcpy(this->path, asset->path);
        strcpy(this->folder, asset->folder);
}

void Asset::copy_format(Asset *asset, int do_index)
{
        if(do_index) update_index(asset);

        audio_data = asset->audio_data;
        format = asset->format;
        channels = asset->channels;
        sample_rate = asset->sample_rate;
        bits = asset->bits;
        byte_order = asset->byte_order;
        signed_ = asset->signed_;
        header = asset->header;
        dither = asset->dither;
        mp3_bitrate = asset->mp3_bitrate;
        mp4a_bitrate = asset->mp4a_bitrate;
        mp4a_quantqual = asset->mp4a_quantqual;
        use_header = asset->use_header;
        aspect_ratio = asset->aspect_ratio;
        interlace_autofixoption = asset->interlace_autofixoption;
        interlace_mode = asset->interlace_mode;
        interlace_fixmethod = asset->interlace_fixmethod;

        video_data = asset->video_data;
        layers = asset->layers;
        frame_rate = asset->frame_rate;
        width = asset->width;
        height = asset->height;
        strcpy(vcodec, asset->vcodec);
        strcpy(acodec, asset->acodec);

        this->audio_length = asset->audio_length;
        this->video_length = asset->video_length;


        ampeg_bitrate = asset->ampeg_bitrate;
        ampeg_derivative = asset->ampeg_derivative;


        vorbis_vbr = asset->vorbis_vbr;
        vorbis_min_bitrate = asset->vorbis_min_bitrate;
        vorbis_bitrate = asset->vorbis_bitrate;
        vorbis_max_bitrate = asset->vorbis_max_bitrate;

        
        theora_fix_bitrate = asset->theora_fix_bitrate;
        theora_bitrate = asset->theora_bitrate;
        theora_quality = asset->theora_quality;
        theora_sharpness = asset->theora_sharpness;
        theora_keyframe_frequency = asset->theora_keyframe_frequency;
        theora_keyframe_force_frequency = asset->theora_keyframe_frequency;


        jpeg_quality = asset->jpeg_quality;

// mpeg parameters
        vmpeg_iframe_distance = asset->vmpeg_iframe_distance;
        vmpeg_pframe_distance = asset->vmpeg_pframe_distance;
        vmpeg_progressive = asset->vmpeg_progressive;
        vmpeg_denoise = asset->vmpeg_denoise;
        vmpeg_bitrate = asset->vmpeg_bitrate;
        vmpeg_derivative = asset->vmpeg_derivative;
        vmpeg_quantization = asset->vmpeg_quantization;
        vmpeg_cmodel = asset->vmpeg_cmodel;
        vmpeg_fix_bitrate = asset->vmpeg_fix_bitrate;
        vmpeg_seq_codes = asset->vmpeg_seq_codes;
        vmpeg_preset = asset->vmpeg_preset;
        vmpeg_field_order = asset->vmpeg_field_order;


        divx_bitrate = asset->divx_bitrate;
        divx_rc_period = asset->divx_rc_period;
        divx_rc_reaction_ratio = asset->divx_rc_reaction_ratio;
        divx_rc_reaction_period = asset->divx_rc_reaction_period;
        divx_max_key_interval = asset->divx_max_key_interval;
        divx_max_quantizer = asset->divx_max_quantizer;
        divx_min_quantizer = asset->divx_min_quantizer;
        divx_quantizer = asset->divx_quantizer;
        divx_quality = asset->divx_quality;
        divx_fix_bitrate = asset->divx_fix_bitrate;
        divx_use_deblocking = asset->divx_use_deblocking;

        h264_bitrate = asset->h264_bitrate;
        h264_quantizer = asset->h264_quantizer;
        h264_fix_bitrate = asset->h264_fix_bitrate;


        ms_bitrate = asset->ms_bitrate;
        ms_bitrate_tolerance = asset->ms_bitrate_tolerance;
        ms_interlaced = asset->ms_interlaced;
        ms_quantization = asset->ms_quantization;
        ms_gop_size = asset->ms_gop_size;
        ms_fix_bitrate = asset->ms_fix_bitrate;

        
        ac3_bitrate = asset->ac3_bitrate;
        
        png_use_alpha = asset->png_use_alpha;
        exr_use_alpha = asset->exr_use_alpha;
        exr_compression = asset->exr_compression;

        tiff_cmodel = asset->tiff_cmodel;
        tiff_compression = asset->tiff_compression;

        strcpy(pipe, asset->pipe);
        use_pipe = asset->use_pipe;

        strcpy(reel_name, asset->reel_name);
        reel_number = asset->reel_number;
        tcstart = asset->tcstart;
        tcend = asset->tcend;
        tcformat = asset->tcformat;
}

int64_t Asset::get_index_offset(int channel)
{
        if(channel < channels && index_offsets)
                return index_offsets[channel];
        else
                return 0;
}

int64_t Asset::get_index_size(int channel)
{
        if(channel < channels && index_sizes)
                return index_sizes[channel];
        else
                return 0;
}


char* Asset::get_compression_text(int audio, int video)
{
        if(audio)
        {
                switch(format)
                {
                        case FILE_MOV:
                        case FILE_AVI:
                                if(acodec[0])
                                        return quicktime_acodec_title(acodec);
                                else
                                        return 0;
                                break;
                }
        }
        else
        if(video)
        {
                switch(format)
                {
                        case FILE_MOV:
                        case FILE_AVI:
                                if(vcodec[0])
                                        return quicktime_vcodec_title(vcodec);
                                else
                                        return 0;
                                break;
                }
        }
        return 0;
}

Asset& Asset::operator=(Asset &asset)
{
        copy_location(&asset);
        copy_format(&asset, 1);
        return *this;
}


int Asset::equivalent(Asset &asset, 
        int test_audio, 
        int test_video)
{
        int result = (!strcmp(asset.path, path) &&
                format == asset.format);

        if(test_audio && result)
        {
                result = (channels == asset.channels && 
                        sample_rate == asset.sample_rate && 
                        bits == asset.bits && 
                        byte_order == asset.byte_order && 
                        signed_ == asset.signed_ && 
                        header == asset.header && 
                        dither == asset.dither &&
                        !strcmp(acodec, asset.acodec));
        }


        if(test_video && result)
        {
                result = (layers == asset.layers && 
                        frame_rate == asset.frame_rate &&
                        asset.interlace_autofixoption == interlace_autofixoption &&
                        asset.interlace_mode    == interlace_mode &&
                        interlace_fixmethod     == asset.interlace_fixmethod &&
                        width == asset.width &&
                        height == asset.height &&
                        !strcmp(vcodec, asset.vcodec) &&
                        strcmp(reel_name, asset.reel_name) == 0 &&
                        reel_number == asset.reel_number &&
                        tcstart == asset.tcstart &&
                        tcend == asset.tcend &&
                        tcformat == asset.tcformat);
        }

        return result;
}

int Asset::operator==(Asset &asset)
{

        return equivalent(asset, 
                1, 
                1);
}

int Asset::operator!=(Asset &asset)
{
        return !(*this == asset);
}

int Asset::test_path(const char *path)
{
        if(!strcasecmp(this->path, path)) 
                return 1; 
        else 
                return 0;
}

int Asset::test_plugin_title(const char *path)
{
}

int Asset::read(FileXML *file, 
        int expand_relative)
{
        int result = 0;

// Check for relative path.
        if(expand_relative)
        {
                char new_path[BCTEXTLEN];
                char asset_directory[BCTEXTLEN];
                char input_directory[BCTEXTLEN];
                FileSystem fs;

                strcpy(new_path, path);
                fs.set_current_dir("");

                fs.extract_dir(asset_directory, path);

// No path in asset.
// Take path of XML file.
                if(!asset_directory[0])
                {
                        fs.extract_dir(input_directory, file->filename);

// Input file has a path
                        if(input_directory[0])
                        {
                                fs.join_names(path, input_directory, new_path);
                        }
                }
        }


        while(!result)
        {
                result = file->read_tag();
                if(!result)
                {
                        if(file->tag.title_is("/ASSET"))
                        {
                                result = 1;
                        }
                        else
                        if(file->tag.title_is("AUDIO"))
                        {
                                read_audio(file);
                        }
                        else
                        if(file->tag.title_is("AUDIO_OMIT"))
                        {
                                read_audio(file);
                        }
                        else
                        if(file->tag.title_is("FORMAT"))
                        {
                                char *string = file->tag.get_property("TYPE");
                                format = File::strtoformat(string);
                                use_header = 
                                        file->tag.get_property("USE_HEADER", use_header);
                        }
                        else
                        if(file->tag.title_is("FOLDER"))
                        {
                                strcpy(folder, file->read_text());
                        }
                        else
                        if(file->tag.title_is("VIDEO"))
                        {
                                read_video(file);
                        }
                        else
                        if(file->tag.title_is("VIDEO_OMIT"))
                        {
                                read_video(file);
                        }
                        else
                        if(file->tag.title_is("INDEX"))
                        {
                                read_index(file);
                        }
                }
        }

//printf("Asset::read 2\n");
        return 0;
}

int Asset::read_audio(FileXML *file)
{
        if(file->tag.title_is("AUDIO")) audio_data = 1;
        channels = file->tag.get_property("CHANNELS", 2);
// This is loaded from the index file after the EDL but this 
// should be overridable in the EDL.
        if(!sample_rate) sample_rate = file->tag.get_property("RATE", 44100);
        bits = file->tag.get_property("BITS", 16);
        byte_order = file->tag.get_property("BYTE_ORDER", 1);
        signed_ = file->tag.get_property("SIGNED", 1);
        header = file->tag.get_property("HEADER", 0);
        dither = file->tag.get_property("DITHER", 0);

        audio_length = file->tag.get_property("AUDIO_LENGTH", 0);
        acodec[0] = 0;
        file->tag.get_property("ACODEC", acodec);
        


//      ampeg_bitrate = file->tag.get_property("AMPEG_BITRATE", ampeg_bitrate);
//      ampeg_derivative = file->tag.get_property("AMPEG_DERIVATIVE", ampeg_derivative);
// 
//      vorbis_vbr = file->tag.get_property("VORBIS_VBR", vorbis_vbr);
//      vorbis_min_bitrate = file->tag.get_property("VORBIS_MIN_BITRATE", vorbis_min_bitrate);
//      vorbis_bitrate = file->tag.get_property("VORBIS_BITRATE", vorbis_bitrate);
//      vorbis_max_bitrate = file->tag.get_property("VORBIS_MAX_BITRATE", vorbis_max_bitrate);
// 
//      mp3_bitrate = file->tag.get_property("MP3_BITRATE", mp3_bitrate);

        if(!video_data)
        {
                tcstart = 0;
                tcend = audio_length;
                tcformat = 0;
        }

        return 0;
}

int Asset::read_video(FileXML *file)
{
        char string[BCTEXTLEN];

        if(file->tag.title_is("VIDEO")) video_data = 1;
        height = file->tag.get_property("HEIGHT", height);
        width = file->tag.get_property("WIDTH", width);
        layers = file->tag.get_property("LAYERS", layers);
// This is loaded from the index file after the EDL but this 
// should be overridable in the EDL.
        if(!frame_rate) frame_rate = file->tag.get_property("FRAMERATE", frame_rate);
        vcodec[0] = 0;
        file->tag.get_property("VCODEC", vcodec);

        video_length = file->tag.get_property("VIDEO_LENGTH", 0);

        interlace_autofixoption = file->tag.get_property("INTERLACE_AUTOFIX",0);

        ilacemode_to_xmltext(string, BC_ILACE_MODE_NOTINTERLACED);
        interlace_mode = ilacemode_from_xmltext(file->tag.get_property("INTERLACE_MODE",string), BC_ILACE_MODE_NOTINTERLACED);

        ilacefixmethod_to_xmltext(string, BC_ILACE_FIXMETHOD_NONE);
        interlace_fixmethod = ilacefixmethod_from_xmltext(file->tag.get_property("INTERLACE_FIXMETHOD",string), BC_ILACE_FIXMETHOD_NONE);

        file->tag.get_property("REEL_NAME", reel_name);
        reel_number = file->tag.get_property("REEL_NUMBER", reel_number);
        tcstart = file->tag.get_property("TCSTART", tcstart);
        tcend = file->tag.get_property("TCEND", tcend);
        tcformat = file->tag.get_property("TCFORMAT", tcformat);

        return 0;
}

int Asset::read_index(FileXML *file)
{
        delete [] index_offsets;
        index_offsets = new int64_t[channels];
        delete [] index_sizes;
        index_sizes = new int64_t[channels];
        for(int i = 0; i < channels; i++) 
        {
                index_offsets[i] = 0;
                index_sizes[i] = 0;
        }

        int current_offset = 0;
        int current_size = 0;
        int result = 0;

        index_zoom = file->tag.get_property("ZOOM", 1);
        index_bytes = file->tag.get_property("BYTES", (int64_t)0);

        while(!result)
        {
                result = file->read_tag();
                if(!result)
                {
                        if(file->tag.title_is("/INDEX"))
                        {
                                result = 1;
                        }
                        else
                        if(file->tag.title_is("OFFSET"))
                        {
                                if(current_offset < channels)
                                {
                                        index_offsets[current_offset++] = file->tag.get_property("FLOAT", 0);
//printf("Asset::read_index %d %d\n", current_offset - 1, index_offsets[current_offset - 1]);
                                }
                        }
                        else
                        if(file->tag.title_is("SIZE"))
                        {
                                if(current_size < channels)
                                {
                                        index_sizes[current_size++] = file->tag.get_property("FLOAT", 0);
                                }
                        }
                }
        }
        return 0;
}

int Asset::write_index(char *path, int data_bytes)
{
        FILE *file;
        if(!(file = fopen(path, "wb")))
        {
// failed to create it
                printf(_("Asset::write_index Couldn't write index file %s to disk.\n"), path);
        }
        else
        {
                FileXML xml;
// Pad index start position
                fwrite((char*)&(index_start), sizeof(int64_t), 1, file);

                index_status = INDEX_READY;
// Write encoding information
                write(&xml, 
                        1, 
                        "");
                xml.write_to_file(file);
                index_start = ftell(file);
                fseek(file, 0, SEEK_SET);
// Write index start
                fwrite((char*)&(index_start), sizeof(int64_t), 1, file);
                fseek(file, index_start, SEEK_SET);

// Write index data
                fwrite(index_buffer, 
                        data_bytes, 
                        1, 
                        file);
                fclose(file);
        }

// Force reread of header
        index_status = INDEX_NOTTESTED;
//      index_status = INDEX_READY;
        index_end = audio_length;
        old_index_end = 0;
        index_start = 0;
}

// Output path is the path of the output file if name truncation is desired.
// It is a "" if complete names should be used.

int Asset::write(FileXML *file, 
        int include_index, 
        char *output_path)
{
        char new_path[BCTEXTLEN];
        char asset_directory[BCTEXTLEN];
        char output_directory[BCTEXTLEN];
        FileSystem fs;

// Make path relative
        fs.extract_dir(asset_directory, path);
        if(output_path && output_path[0]) 
                fs.extract_dir(output_directory, output_path);
        else
                output_directory[0] = 0;

// Asset and EDL are in same directory.  Extract just the name.
        if(!strcmp(asset_directory, output_directory))
        {
                fs.extract_name(new_path, path);
        }
        else
        {
                strcpy(new_path, path);
        }

        file->tag.set_title("ASSET");
        file->tag.set_property("SRC", new_path);
        file->append_tag();
        file->append_newline();

        file->tag.set_title("FOLDER");
        file->append_tag();
        file->append_text(folder);
        file->tag.set_title("/FOLDER");
        file->append_tag();
        file->append_newline();

// Write the format information
        file->tag.set_title("FORMAT");

        file->tag.set_property("TYPE", 
                File::formattostr(format));
        file->tag.set_property("USE_HEADER", use_header);

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

// Requiring data to exist caused batch render to lose settings.
// But the only way to know if an asset doesn't have audio or video data 
// is to not write the block.
// So change the block name if the asset doesn't have the data.
        /* if(audio_data) */ write_audio(file);
        /* if(video_data) */ write_video(file);
        if(index_status == 0 && include_index) write_index(file);  // index goes after source

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

int Asset::write_audio(FileXML *file)
{
// Let the reader know if the asset has the data by naming the block.
        if(audio_data)
                file->tag.set_title("AUDIO");
        else
                file->tag.set_title("AUDIO_OMIT");
// Necessary for PCM audio
        file->tag.set_property("CHANNELS", channels);
        file->tag.set_property("RATE", sample_rate);
        file->tag.set_property("BITS", bits);
        file->tag.set_property("BYTE_ORDER", byte_order);
        file->tag.set_property("SIGNED", signed_);
        file->tag.set_property("HEADER", header);
        file->tag.set_property("DITHER", dither);
        if(acodec[0])
                file->tag.set_property("ACODEC", acodec);
        
        file->tag.set_property("AUDIO_LENGTH", audio_length);



// Rely on defaults operations for these.

//      file->tag.set_property("AMPEG_BITRATE", ampeg_bitrate);
//      file->tag.set_property("AMPEG_DERIVATIVE", ampeg_derivative);
// 
//      file->tag.set_property("VORBIS_VBR", vorbis_vbr);
//      file->tag.set_property("VORBIS_MIN_BITRATE", vorbis_min_bitrate);
//      file->tag.set_property("VORBIS_BITRATE", vorbis_bitrate);
//      file->tag.set_property("VORBIS_MAX_BITRATE", vorbis_max_bitrate);
// 
//      file->tag.set_property("MP3_BITRATE", mp3_bitrate);
// 



        file->append_tag();
        if(audio_data)
          file->tag.set_title("/AUDIO");
        else
          file->tag.set_title("/AUDIO_OMIT");
        file->append_tag();
        file->append_newline();
        return 0;
}

int Asset::write_video(FileXML *file)
{
        char string[BCTEXTLEN];

        if(video_data)
                file->tag.set_title("VIDEO");
        else
                file->tag.set_title("VIDEO_OMIT");
        file->tag.set_property("HEIGHT", height);
        file->tag.set_property("WIDTH", width);
        file->tag.set_property("LAYERS", layers);
        file->tag.set_property("FRAMERATE", frame_rate);
        if(vcodec[0])
                file->tag.set_property("VCODEC", vcodec);

        file->tag.set_property("VIDEO_LENGTH", video_length);

        file->tag.set_property("INTERLACE_AUTOFIX", interlace_autofixoption);

        ilacemode_to_xmltext(string, interlace_mode);
        file->tag.set_property("INTERLACE_MODE", string);

        ilacefixmethod_to_xmltext(string, interlace_fixmethod);
        file->tag.set_property("INTERLACE_FIXMETHOD", string);


        file->tag.set_property("REEL_NAME", reel_name);
        file->tag.set_property("REEL_NUMBER", reel_number);
        file->tag.set_property("TCSTART", tcstart);
        file->tag.set_property("TCEND", tcend);
        file->tag.set_property("TCFORMAT", tcformat);

        file->append_tag();
        if(video_data)
                file->tag.set_title("/VIDEO");
        else
                file->tag.set_title("/VIDEO_OMIT");

        file->append_tag();
        file->append_newline();
        return 0;
}

int Asset::write_index(FileXML *file)
{
        file->tag.set_title("INDEX");
        file->tag.set_property("ZOOM", index_zoom);
        file->tag.set_property("BYTES", index_bytes);
        file->append_tag();
        file->append_newline();

        if(index_offsets)
        {
                for(int i = 0; i < channels; i++)
                {
                        file->tag.set_title("OFFSET");
                        file->tag.set_property("FLOAT", index_offsets[i]);
                        file->append_tag();
                        file->tag.set_title("/OFFSET");
                        file->append_tag();
                        file->tag.set_title("SIZE");
                        file->tag.set_property("FLOAT", index_sizes[i]);
                        file->append_tag();
                        file->tag.set_title("/SIZE");
                        file->append_tag();
                }
        }

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




char* Asset::construct_param(char *param, char *prefix, char *return_value)
{
        if(prefix)
                sprintf(return_value, "%s%s", prefix, param);
        else
                strcpy(return_value, param);
        return return_value;
}

#define UPDATE_DEFAULT(x, y) defaults->update(construct_param(x, prefix, string), y);
#define GET_DEFAULT(x, y) defaults->get(construct_param(x, prefix, string), y);

void Asset::load_defaults(BC_Hash *defaults, 
        char *prefix, 
        int do_format,
        int do_compression,
        int do_path,
        int do_data_types,
        int do_bits)
{
        char string[BCTEXTLEN];

// Can't save codec here because it's specific to render, record, and effect.
// The codec has to be UNKNOWN for file probing to work.

        if(do_path)
        {
                GET_DEFAULT("PATH", path);
        }

        if(do_compression)
        {
                GET_DEFAULT("AUDIO_CODEC", acodec);
                GET_DEFAULT("VIDEO_CODEC", vcodec);
        }

        if(do_format)
        {
                format = GET_DEFAULT("FORMAT", format);