libppub/src/lib/Ppvm.vala

using Invercargill;

namespace Ppub {

    public class VideoManifest {

        public const string TITLE = "title";
        public const string AUTHOR = "author";
        public const string COPYRIGHT = "copyright";
        public const string LICENCE = "licence";
        public const string MASTER = "master";
        public const string POSTER = "poster";
        public const string RATIO = "ratio";
        public const string DURATION = "duration";
        public const string DESCRIPTION_ASSET = "description";

        public const string VIDEO = "video";
    
        private Gee.HashMap<string, string> entries { get; set; }

        public Invercargill.Sequence<VideoDescription> streams { get; set; }

        public VideoManifest() {
            entries = new Gee.HashMap<string, string>();
            streams = Invercargill.empty<VideoDescription>().to_sequence();
        }
    
        public string? get_value(string name) {
            if (entries.has_key(name)) {
                return entries.get(name);
            }
            return null;
        }
    
        public void set_value(string name, string value) {
            entries.set(name, value);
        }
    
        public string? title {
            owned get {
                return get_value(TITLE);
            }
            set {
                set_value(TITLE, value);
            }
        }
    
        public string? author {
            owned get {
                return get_value(AUTHOR);
            }
            set {
                set_value(AUTHOR, value);
            }
        }
    
        public string? copyright {
            owned get {
                return get_value(COPYRIGHT);
            }
            set {
                set_value(COPYRIGHT, value);
            }
        }
    
        public string? licence {
            owned get {
                return get_value(LICENCE);
            }
            set {
                set_value(LICENCE, value);
            }
        }
    
        public string? master {
            owned get {
                return get_value(MASTER);
            }
            set {
                set_value(MASTER, value);
            }
        }
    
        public string? poster {
            owned get {
                return get_value(POSTER);
            }
            set {
                set_value(POSTER, value);
            }
        }
    
        public double[]? ratio {
            owned get {
                var ratio = get_value(RATIO);
                if(ratio == null) {
                    return null;
                }
                var ratio_data = ratio.split(":", 2);
                return new double[] {
                    double.parse(ratio_data[0]),
                    double.parse(ratio_data[1])
                };
            }
            set {
                set_value(RATIO, @"$(value[0]):$(value[1])");
            }
        }
    
        public double? duration {
            owned get {
                var duration = get_value(DURATION);
                if(duration == null) {
                    return null;
                }
                return double.parse(duration);
            }
            set {
                set_value(DURATION, value.to_string());
            }
        }

        public string? description_file_name {
            owned get {
                return get_value(DESCRIPTION_ASSET);
            }
            set {
                set_value(DESCRIPTION_ASSET, value);
            }
        }

        public VideoManifest.from_stream(InputStream stream) throws IOError {

            var dis = new DataInputStream(stream);
            entries = new Gee.HashMap<string, string>();
            streams = new Invercargill.Sequence<VideoDescription>();

            var metadata_complete = false;
            string line = dis.read_line();
            if(line != "PPVM") {
                throw new IOError.INVALID_DATA("Stream does not begin with PPVM magic number");
            }
            while((line = dis.read_line()) != null) {
                if(line.chomp().chug() == "") {
                    metadata_complete = true;
                    continue;
                }

                var kv = line.split(": ", 2);

                if(!metadata_complete) {
                    print(@"[Stream reader] Property $(kv[0]) is $(kv[1])\n");
                    entries.set(kv[0], kv[1]);
                }
                else {
                    if(kv[0] == VIDEO) {
                        streams.add(new VideoDescription.from_string(kv[1]));
                    }
                }
            }

        }

        public string to_string() {
            var data = "PPVM\n";
            foreach (var key in entries.keys) {
                data += @"$key: $(entries[key])\n";
            }

            data += "\n";

            foreach (var stream in streams) {
                data += @"$VIDEO: $(stream.to_string())\n";
            }

            data += "\n";

            return data;
        }


    }

    public class VideoDescription {

        public string version_label {get; set;}
        public string file_name {get; set;}

        public const string SIZE = "size";
        public const string CODECS = "codecs";

        private Gee.HashMap<string, string> properties { get; set; }

        public VideoDescription() {
            properties = new Gee.HashMap<string, string>();
        }

        public VideoDescription.from_string(string line) {
            var fields = line.split(", ", 3);
            version_label = fields[0];
            file_name = fields[1];

            properties = new Gee.HashMap<string, string>();
            var property_items = fields[2].split(";");
            foreach (var item in property_items) {
                if(item.chomp().chug() == ""){
                    continue;
                }

                var item_parts = item.split("=\"", 2);
                var name = item_parts[0].chomp().chug();
                var value = item_parts[1].split("\"")[0];
                print(@"prop: $(name) = $(value)\n");
                properties.set(name, value);
            }
        }

        public string to_string() {
            var meta = "";
            foreach(var key in properties.keys) {
                meta += @" $key=\"$(properties[key])\";";
            }

            return @"$version_label, $file_name,$meta";
        }

        public string? get_property(string name) {
            if (properties.has_key(name)) {
                return properties.get(name);
            }
            return null;
        }
    
        public void set_property(string name, string value) {
            properties.set(name, value);
        }

        public string? codecs {
            owned get {
                return get_property(CODECS);
            }
            set {
                set_property(CODECS, value);
            }
        }

        public string? size {
            owned get {
                return get_property(SIZE);
            }
            set {
                set_property(SIZE, value);
            }
        }

    }

}