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Home Wiki
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GPAC@WASM - Run MP4Box and gpac in your browser !
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+ let fio = {
+ udta: this.dict.length,
+ url: url,
+ _wrap_io: wrap_io,
+ _pos: 0,
+ _size: 0,
+ _stream: null, //FS.open stream object
+ _file: null, //fileSelector file object
+ _refs: 0,
+ _select: 0,
+ _block_pos_in_file: 0,
+ _block_pos: 0, //amount of bytes read from block
+ _ab: null,
+ _max_bsize: GPAC.read_block_size, //min size, will grow to block_size of fin filter
+ _discard_next: null,
+ _timer: null,
+ _writer: null,
+ _fetch: null,
+ _fetch_wait: null,
+ gfio_url: function() {
+ return GFIO.get_url(fio._gfio);
+ }
+ };
+ this.dict.push(fio);
+ fio._gfio = this.wrap_new(url, fio.udta, this._pf_open, this._pf_seek, (mode==2) ? 0 : this._pf_read, (mode==1) ? 0 : this._pf_write, this._pf_tell, this._pf_eof, 0);
+ //only run gfio on main thread ?
+ this.tag_main(fio._gfio);
+ return fio;
+ },
+ //for file system read, loads next block from file
+ _load_block: function(fio) {
+ let max_bsize = fio._max_bsize;
+ let bsize = (fio._block_pos_in_file + max_bsize > fio._size) ? (fio._size - fio._block_pos_in_file) : max_bsize;
+ let blob = fio._file.slice(fio._block_pos_in_file, fio._block_pos_in_file + bsize);
+ let read = new FileReader();
+ read.onload = function(evt) {
+ fio._ab = evt.target.result;
+ };
+ read.readAsArrayBuffer(blob);
+ }
+ };
+
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