Club Amiga de Montreal - CAM/CAM_CD_1.iso/files/364b.lha/PCQ_v1.1/Examples/Play8.p

Text File | 1990-04-08 | 6.5 KB | 276 lines

Program Play8;

{
    Play8.p

    Play a one-shot 8SVX IFF sound file.  The command line is simply
    Play8 filename, where the filename is any path and must be
    present.  This code was derived from Eric Jacobsen's spIFF.c.
    The differences between this and spIFF.c:
       a) This was translated from C to Pascal
       b) Several sound files in my collection had odd-length
        name or annotation fields.  That is, the field lengths
        in the file were odd, but the actual data was padded
        with an extra 0 byte.  So this program handles that.
       c) I added decompression routines taken from an old IFF
        documentation disk.  I couldn't find any properly
        formatted compressed sound files, however, so I'm not
        sure if the decompression is accurate.  The program
        will certainly try to decompress files, but mine came
        out garbage.  Based on the samples I've accumulated,
        it seems that few of them are compressed anyway.

    In my distribution, I included a sample sample, as it were,
    called UseTheForce.8SVX, which obviously came from Star Wars.
}

{$I ":Include/Exec.i"}
{$I ":Include/Ports.i"  I include this here so ExecIO won't have to.
            Otherwise it would try to load "Include/Ports.i",
            which would not necessarily fit in here.}
{$I ":Include/ExecIO.i"}
{$I ":Include/ExecIOUtils.i"}
{$I ":Include/DOS.i"}
{$I ":Include/StringLib.i"}
{$I ":Include/Audio.i"}
{$I ":Include/Parameters.i"}

type
    Voice8Header = record
    oneShotHiSamples,
    repeatHiSamples,
    samplesPreHiCycle : Integer;
    samplesPerSec : Short;
    ctOctave    : Byte;
    sCompression    : Byte;
    volume : Integer;
    end;

type
    FibTable = Array [0..15] of Byte;

const
    ckname : String = Nil;
    NoMem  : String = "\nNot enough memory.\n";
    reps : Integer = 1;
    wrt_flg : Boolean = True;
    ioa : IOAudioPtr = Nil;
    dbuf : Address = Nil;
    FP : FileHandle = Nil;
    codeToDelta : FibTable = (-34, -21, -13, -8, -5, -3, -2, -1, 0,
                1, 2, 3, 5, 8, 13, 21);

var
    VHeader : Voice8Header;
    chan : Char;
    s, ps : String;
    dlen, oerr, i : Integer;
    chnk : ^Integer;
    ckbuffer : Array [0..2] of Short;
    t : Address;

procedure BeginIO(io : IORequestPtr);
begin
{$A    move.l    8(a5),a1
    move.l    $14(a1),a6
    jsr    -$1E(a6)
}
end;

Function D1Unpack(source : String; n : Integer; dest : String; x : Byte) : Byte;
var
    d : Byte;
    i, lim : Integer;
begin
    lim := n shl 1;
    for i := 0 to lim - 1 do begin
    d := Ord(Source[i shr 1]);
    if Odd(i) then
        d := d and 15
    else
        d := d shr 4;
    x := x + codeToDelta[d];
    dest[i] := Chr(x);
    end;
    D1Unpack := x;
end;

Procedure DUnpack(source : String; n : Integer; dest : Address);
var
    x : Byte;
begin
    x := D1Unpack(Adr(source[1]), n - 2, dest, Ord(source[0]));
end;

Procedure OpenFile;
var
    NameBuffer : Array [0..127] of char;
    Name : String;
begin
    Name := Adr(NameBuffer);
    GetParam(1, Name);
    if strlen(Name) = 0 then begin
    Writeln('Usage: Play8 filename');
    Exit(10);
    end;
    FP := DOSOpen(Name, ModeOldFile);
    if FP = Nil then begin
    Writeln('Could not open ', Name);
    Exit(10);
    end;
end;

procedure CleanUp;
begin
    if ioa <> Nil then begin
    with ioa^.ioaRequest.ioMessage do begin
        if mnReplyPort <> Nil then
        DeletePort(mnReplyPort);
    end;
    FreeMem(ioa, SizeOf(IOAudio));
    end;
    if dbuf <> Nil then
    FreeMem(dbuf, dlen);
    if FP <> nil then
    DOSClose(FP);
end;


Procedure pExit(Msg : String);
begin
    Writeln(Msg);
    CleanUp;
    Exit(20);
end;

Procedure DoRead(Buffer : Address; Length : Integer);
var
    ReadResult : Integer;
begin
    ReadResult := DOSRead(FP, Buffer, Length);
    if ReadResult <> Length then
    pExit("Read error");
end;

Procedure WriteData(len : Integer);
var
    MBuffer : Array [0..127] of Char;
    MString : String;
begin
    MString := Adr(MBuffer);
    if Odd(len) then
    len := Succ(len);
    MBuffer[127] := '\0';
    while len > 127 do begin
    DoRead(MString, 127);
    if wrt_flg then
        Write(MString);
    len := len - 127;
    end;
    if len > 0 then begin
    DoRead(MString, len);
    MString[len] := '\0';
    if wrt_flg then
        Writeln(MString);
    end;
    wrt_flg := True;
end;

begin
    ckname := Adr(ckbuffer);
    ckname[4] := '\0';
    chan := Chr(15);
    OpenFile;
    DoRead(ckname, 4);
    if streq(ckname, "FORM") then begin
    DoRead(ckname,4);    { Get size out of the way. }
    DoRead(ckname,4);
    if streq(ckname,"8SVX") then begin
        DoRead(ckname,4);
        while not streq(ckname,"BODY") do begin
        DoRead(Adr(dlen), 4);
        if streq(ckname,"VHDR") then
            DoRead(Adr(VHeader), SizeOf(Voice8Header))
        else begin
            chnk := Address(ckname);
            case chnk^ of
              $4e414d45: Write("\nName of sample: ");
              $41555448: Write("\nAuthor: ");
              $28432920,
              $28632920,
              $2843294a,
              $2863294a: Write("\n(c) notice: ");
              $414e4e4f: WriteLn("\nAnnotation field:");
            else
              wrt_flg := True;
            end;
            WriteData(dlen);
        end;
        DoRead(ckname, 4);
        end;
        DoRead(Adr(dlen), 4);
        Writeln(dlen, ' bytes at ', VHeader.samplesPerSec, 'Hz');
    end else
        pExit("Not an 8SVX sound file.")
    end else
    pExit("Not an IFF file.");
    ioa := AllocMem(SizeOf(IOAudio), MemPublic);
    if ioa = Nil then
    pExit(NoMem);
    with ioa^.ioaRequest.ioMessage do begin
    mnReplyPort := CreatePort(Nil, 0);
    if mnReplyPort = nil then
        pExit("Unable to allocate port");
    end;

    dbuf := AllocMem(dlen, MemPublic + MemChip);
    if dbuf = Nil then
    pExit(NoMem);

    with ioa^ do begin
    ioaRequest.ioMessage.mnNode.lnPri := 10;
    ioaData := Adr(chan);
    ioaLength := 1;
    ioaAllocKey := 0;
    end;

    oerr := OpenDevice(AUDIONAME, 0, IORequestPtr(ioa), 0);
    if oerr <> 0 then
    pExit("Can't open audio device");

    if dlen > 131000 then begin  { Supposed hardware limitation. }
    dlen := 131000;
    end else if Odd(dlen) then
    dlen := Pred(dlen);
    DoRead(dbuf, dlen);

    if VHeader.sCompression = 1 then begin
    t := AllocMem(dlen shl 1, MemChip + MemPublic);
    if t = Nil then
        pExit("Not enough memory for decompression");
    DUnpack(dbuf, dlen, t);
    FreeMem(dbuf, dlen);
    dbuf := t;
    dlen := dlen shl 1;
    end else if VHeader.sCompression > 1 then
    pExit("Unknown compression type");

    with ioa^ do begin
    ioaRequest.ioCommand := CMD_WRITE;
    ioaRequest.ioFlags := ADIOF_PERVOL;
    ioaData := dbuf;
    ioaCycles := 1;        { 1 or from command line. }
    ioaLength := dlen;
    ioaPeriod := 3579546 div VHeader.samplesPerSec;
    ioaVolume := 64;         { Always use maximum volume. }
    end;

    BeginIO(IORequestPtr(ioa));
    oerr := WaitIO(IORequestPtr(ioa));

    if oerr <> 0 then
    Writeln('Error ', oerr, ' playing sample');
    CloseDevice(IORequestPtr(ioa));
    CleanUp;
end.