// Detect It Easy: detection rule file
// Author: Kae <TG@kaens>

// https://github.com/Gota7/NitroStudio2/blob/master/docs/specs/stream.md
meta("audio", "Nintendo DS multi-channel stream (.STRM)");

function detect() {
    if ((!X.c("'STRM'FE") && !X.c("'STRM'FF")) || X.U8(4) == X.U8(5) || X.U8(5) < 0xFE || !X.c("'HEAD'", 0x10)) return;
    var e = X.U8(4) == 0xFF ? _LE : _BE, dp = 0x10 + X.U32(0x14, e);
    if (X.U8(0x19) > 1 || dp > X.Sz()) return;
    if (!X.c("'DATA'", dp) || X.U32(0x28, e) != dp + 8 || X.U32(8, e) != dp + X.U32(dp + 4, e)) return;

    bDetected = true;

    sVersion = ['PCM8s', 'PCM16', 'IMA-ADPCM'][X.U8(0x18)] + '/' + (e == _LE ? 'le' : 'be');
    if (X.isVerbose()) {
        var ch = X.U8(0x1A), len = (X.U32(0x24, e) / X.U16(0x1C, e)).toFixed(0);
        sOption(
            'ch:' + ch + ' len ' + secondsToTimeStr(len) +
            ' s/r:' + X.U16(0x1C, e) + 'Hz ' + ['not looped', 'looped'][X.U8(0x19)] + ' sz:' + outSz(X.U32(dp + 4, e) + dp)
        );
    }

    return result();
}