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snd_mem.pas
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snd_mem.pas
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// ------------------------------------------------------------------------------
// DelphiQuake, Copyright (C) 2005-2011 by Jim Valavanis
// E-Mail: jimmyvalavanis@yahoo.gr
//
// Copyright (C) 1996-1997 Id Software, Inc.
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
//
// See the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
// ------------------------------------------------------------------------------
{$I dquake.inc}
{$Z4}
unit snd_mem;
// snd_mem.c: sound caching
interface
uses
q_delphi,
sound;
procedure ResampleSfx(sfx: Psfx_t; inrate: integer; inwidth: integer; data: PByteArray);
function S_LoadSound(s: Psfx_t): Psfxcache_t;
function GetWavinfo(name: PChar; wav: PByteArray; wavlength: integer): wavinfo_t;
implementation
uses
zone,
snd_dma_h,
common,
console,
sys_win;
(*
================
ResampleSfx
================
*)
procedure ResampleSfx(sfx: Psfx_t; inrate: integer; inwidth: integer; data: PByteArray);
var
outcount: integer;
srcsample: integer;
stepscale: single;
i: integer;
sample, samplefrac, fracstep: integer;
sc: Psfxcache_t;
begin
sc := Cache_Check(@sfx.cache);
if sc = nil then
exit;
stepscale := inrate / shm.speed; // this is usually 0.5, 1, or 2
outcount := intval(sc.length / stepscale);
sc.length := outcount;
if sc.loopstart <> -1 then
sc.loopstart := intval(sc.loopstart / stepscale);
sc.speed := shm.speed;
if loadas8bit.value <> 0 then
sc.width := 1
else
sc.width := inwidth;
sc.stereo := 0;
// resample / decimate to the current source rate
if (stepscale = 1) and (inwidth = 1) and (sc.width = 1) then
begin
// fast special case
for i := 0 to outcount - 1 do
signed_char(sc.data[i]) := data[i] - 128; // JVAL ???
end
else
begin
// general case
samplefrac := 0;
fracstep := intval(stepscale * 256);
for i := 0 to outcount - 1 do
begin
srcsample := samplefrac div 256;
samplefrac := samplefrac + fracstep;
if inwidth = 2 then
sample := LittleShort(PshortArray(data)[srcsample])
else
sample := ((data[srcsample] - 128) shl 8); // JVAL check!
if sc.width = 2 then
PShortArray(@sc.data)[i] := sample
else
sc.data[i] := sample div 256;
end;
end;
end;
//=============================================================================
(*
==============
S_LoadSound
==============
*)
function S_LoadSound(s: Psfx_t): Psfxcache_t;
var
namebuffer: array[0..255] of char;
data: PByteArray;
info: wavinfo_t;
len: integer;
stepscale: single;
sc: Psfxcache_t;
stackbuf: array[0..1 * 1024 - 1] of byte; // avoid dirtying the cache heap // JVAL ???
begin
// see if still in memory
sc := Cache_Check(@s.cache);
if sc <> nil then
begin
result := sc;
exit;
end;
//Con_Printf ("S_LoadSound: %x\n", (int)stackbuf);
// load it in
Q_strcpy(namebuffer, 'sound/');
Q_strcat(namebuffer, s.name);
// Con_Printf ("loading %s\n",namebuffer);
data := COM_LoadStackFile(namebuffer, @stackbuf, SizeOf(stackbuf)); // JVAL check stackbuf
if data = nil then
begin
Con_Printf('Couldn''t load %s'#10, [namebuffer]);
result := nil;
exit;
end;
info := GetWavinfo(s.name, data, com_filesize);
if info.channels <> 1 then
begin
Con_Printf('%s is a stereo sample'#10, [s.name]);
result := nil;
exit;
end;
stepscale := info.rate / shm.speed;
len := intval(info.samples / stepscale);
len := len * info.width * info.channels;
sc := Cache_Alloc(@s.cache, len + SizeOf(sfxcache_t), s.name);
if sc = nil then
begin
result := nil;
exit;
end;
sc.length := info.samples;
sc.loopstart := info.loopstart;
sc.speed := info.rate;
sc.width := info.width;
sc.stereo := info.channels;
ResampleSfx(s, sc.speed, sc.width, @data[info.dataofs]);
result := sc;
end;
(*
===============================================================================
WAV loading
===============================================================================
*)
var
data_p: PByte;
iff_end: PByte;
last_chunk: PByte;
iff_data: PByte;
iff_chunk_len: integer;
function GetLittleShort: short; // JVAL check shifts, negative values???
begin
result := data_p^;
inc(data_p);
result := result + data_p^ * 256;
inc(data_p);
end;
function GetLittleLong: integer; // JVAL check shifts, negative values???
begin
result := data_p^;
inc(data_p);
result := result + data_p^ * 256;
inc(data_p);
result := result + data_p^ * (256 * 256);
inc(data_p);
result := result + data_p^ * (256 * 256 * 256);
inc(data_p);
end;
procedure FindNextChunk(name: PChar);
begin
while true do
begin
data_p := last_chunk;
if integer(data_p) >= integer(iff_end) then
begin // didn't find the chunk
data_p := nil;
exit;
end;
inc(data_p, 4);
iff_chunk_len := GetLittleLong;
if iff_chunk_len < 0 then
begin
data_p := nil;
exit;
end;
// if (iff_chunk_len > 1024*1024)
// Sys_Error ("FindNextChunk: %d length is past the 1 meg sanity limit", iff_chunk_len);
dec(data_p, 8);
last_chunk := data_p;
inc(last_chunk, 8 + ((iff_chunk_len + 1) and (not 1)));
if Q_strncmp(PChar(data_p), name, 4) = 0 then
exit;
end;
end;
procedure FindChunk(name: PChar);
begin
last_chunk := iff_data;
FindNextChunk(name);
end;
procedure DumpChunks;
var
str: array[0..4] of char;
begin
str[4] := #0;
data_p := iff_data;
repeat
memcpy(@str[0], data_p, 4);
inc(data_p, 4);
iff_chunk_len := GetLittleLong;
Con_Printf('0x%x : %s (%d)'#10, [integer(data_p) - 4, @str[0], iff_chunk_len]);
inc(data_p, (iff_chunk_len + 1) and (not 1));
until integer(data_p) >= integer(iff_end);
end;
(*
============
GetWavinfo
============
*)
function GetWavinfo(name: PChar; wav: PByteArray; wavlength: integer): wavinfo_t;
var
i: integer;
format: integer;
samples: integer;
begin
ZeroMemory(@result, SizeOf(result));
if wav = nil then
exit;
iff_data := @wav[0];
iff_end := @wav[wavlength];
// find "RIFF" chunk
FindChunk('RIFF');
if not ((data_p <> nil) and (Q_strncmp(C_PChar(data_p, 8), 'WAVE', 4) = 0)) then
begin
Con_Printf('Missing RIFF/WAVE chunks'#10);
exit;
end;
// get "fmt " chunk
iff_data := data_p;
inc(iff_data, 12);
// DumpChunks ();
FindChunk('fmt ');
if data_p = nil then
begin
Con_Printf('Missing fmt chunk'#10);
exit;
end;
inc(data_p, 8);
format := GetLittleShort;
if format <> 1 then
begin
Con_Printf('Microsoft PCM format only'#10);
exit;
end;
result.channels := GetLittleShort();
result.rate := GetLittleLong();
inc(data_p, 4 + 2);
result.width := GetLittleShort div 8;
// get cue chunk
FindChunk('cue ');
if data_p <> nil then
begin
inc(data_p, 32);
result.loopstart := GetLittleLong;
// Con_Printf("loopstart=%d\n", sfx->loopstart);
// if the next chunk is a LIST chunk, look for a cue length marker
FindNextChunk('LIST');
if data_p <> nil then
begin
if strncmp(C_PChar(data_p, 28), 'mark', 4) = 0 then
begin // this is not a proper parse, but it works with cooledit...
inc(data_p, 24);
i := GetLittleLong; // samples in loop
result.samples := result.loopstart + i; // JVAL pointers ???
// Con_Printf("looped length: %d\n", i);
end;
end;
end
else
result.loopstart := -1;
// find data chunk
FindChunk('data');
if data_p = nil then
begin
Con_Printf('Missing data chunk'#10);
exit;
end;
inc(data_p, 4);
samples := GetLittleLong div result.width;
if result.samples <> 0 then
begin
if samples < result.samples then
Sys_Error('Sound %s has a bad loop length', [name]);
end
else
result.samples := samples;
result.dataofs := integer(data_p) - integer(wav); // JVAL check!
end;
end.