Decent analysis of UTalk

Client/Makefile

@@ -0,0 +1,3 @@
+ifdef niotso_buildsys
+    niotso_exes += TSO$(EXE)
+endif

Documentation.txt

@@ -1,6 +1,6 @@
 All documentation is centralized online rather than scattered around the codebase.
 
-For documentation regarding the packages in the repository, that will be at Trac:
+For documentation regarding the packages in the repository, that will be at the Trac:
 http://trac-hg.assembla.com/niotso
 
 For all other documentation (including format specifications), that will be at Niotso Wiki:

Libraries/FileHandler/utk/read_utk.c

@@ -1,5 +1,5 @@
 /*
-    read_utk.c - Copyright (c) 2011 Fatbag <X-Fi6@phppoll.org>
+    read_utk.c - Copyright (c) 2011-2012 Fatbag <X-Fi6@phppoll.org>
 
     Permission to use, copy, modify, and/or distribute this software for any
     purpose with or without fee is hereby granted, provided that the above
@@ -88,10 +88,10 @@ int utk_decode(const uint8_t *__restrict InBuffer, uint8_t *__restrict OutBuffer
             if(value < -32767)
                 value = 32767;
             else if(value > 32768)
-                value = 98304;
+                value = 32768;
 
-            *(OutBuffer++) = (value&0x00FFu)>>(8*0);
+            *(OutBuffer++) = (value&0x00FF)>>(8*0);
-            *(OutBuffer++) = (value&0xFF00u)>>(8*1);
+            *(OutBuffer++) = (value&0xFF00)>>(8*1);
         }
         Frames -= BlockSize;
     }
@@ -99,7 +99,7 @@ int utk_decode(const uint8_t *__restrict InBuffer, uint8_t *__restrict OutBuffer
 }
 
 void UTKGenerateTables(void){
-    /* Call once */
+    /* Call once per runtime */
     int i;
 
     /* UTKTable1 */
@@ -139,108 +139,111 @@ void UTKGenerateTables(void){
     }
 }
 
-uint8_t ReadBits(utkparams_t *p, uint8_t i){
+uint8_t ReadBits(utkparams_t *p, uint8_t bits){
-    unsigned returnvalue = (255>>(8-i)) & p->x;
+    unsigned value = p->UnreadBitsValue & (255>>(8-bits));
-    p->x >>= i;
+    p->UnreadBitsValue >>= bits;
-    p->y -= i;
+    p->UnreadBitsCount -= bits;
 
-    if(p->y < 8){
+    if(p->UnreadBitsCount < 8){
-        unsigned value = *(p->InData++);
+        p->UnreadBitsValue |= *(p->InData++) << p->UnreadBitsCount;
-        p->x |= value << (p->y&0xFF);
+        p->UnreadBitsCount += 8;
-        p->y += 8;
     }
-    return returnvalue;
+    return value;
 }
 
 void SetUTKParameters(utkparams_t *p){
+    /* Call once per file */
     int i;
     float s;
-    p->x = *(p->InData++);
+    p->UnreadBitsValue = *(p->InData++);
-    p->y = 8;
+    p->UnreadBitsCount = 8;
-    p->a = ReadBits(p, 1);
+    p->UseLattice = (int)ReadBits(p, 1);
-    p->b = 32 - ReadBits(p, 4);
+    p->NoiseFloor = 32 - ReadBits(p, 4);
-    p->c[0] = (ReadBits(p, 4)+1)*8;
+    p->FixedCodebook[0] = (ReadBits(p, 4)+1)*8;
 
-    s = ((float)ReadBits(p, 6))/1000 + 1.04;
+    s = (float)ReadBits(p, 6)/1000 + 1.04;
     for(i=1; i<64; i++)
-        p->c[i] = p->c[i-1]*s;
+        p->FixedCodebook[i] = p->FixedCodebook[i-1]*s;
 
-    memset(&p->c[64], 0, 24*sizeof(float));
+    memset(p->ImpulseTrain, 0, 12*sizeof(float));
-    memset(p->d, 0, 324*sizeof(float));
+    memset(p->R, 0, 12*sizeof(float));
+    memset(p->Delay, 0, 324*sizeof(float));
 }
 
 void DecompressBlock(utkparams_t *p){
     int i,j;
     float Window[118];
     float Matrix[12];
-    int Branch = 0;
+    int Voiced = 0;
 
     memset(&Window[0], 0, 5*sizeof(float));
     memset(&Window[113], 0, 5*sizeof(float));
 
     for(i=0; i<12; i++){
         unsigned result = ReadBits(p, (i<4) ? 6 : 5);
-        if(i==0 && p->b > result) Branch++;
+        if(i==0 && p->NoiseFloor > result) Voiced++;
-        Matrix[i] = (UTKTable1[result + ((i<4)?0:16)] - p->c[64+i])/4;
+        Matrix[i] = (UTKTable1[result + ((i<4)?0:16)] - p->ImpulseTrain[i])/4;
     }
 
     for(i=0; i<4; i++){
-        float c1, c2;
+        float PitchGain, InnovationGain;
-        int o = (int)ReadBits(p, 8);
+        int Phase = (int)ReadBits(p, 8);
-        c1 = ((float)ReadBits(p, 4))/15;
+        PitchGain = (float)ReadBits(p, 4)/15;
-        c2 = p->c[ReadBits(p, 6)];
+        InnovationGain = p->FixedCodebook[ReadBits(p, 6)];
 
-        if(!p->a){
+        if(!p->UseLattice){
-            Unknown1(p, Branch, &Window[5], 1);
+            LatticeFilter(p, Voiced, &Window[5], 1);
         }else{
-            unsigned x = ReadBits(p, 1);
+            int o = ReadBits(p, 1); /* Order */
-            unsigned y = ReadBits(p, 1);
+            int y = ReadBits(p, 1);
-            Unknown1(p, Branch, &Window[5+x], 2);
+            LatticeFilter(p, Voiced, &Window[5+o], 2);
 
             if(y){
                 for(j=0; j<108; j+=2)
-                    Window[6-x + j] = 0;
+                    Window[6-o + j] = 0;
             }else{
-                float *z = &Window[6-x];
+                /* Vector quantization */
+                float *z = &Window[6-o];
                 for(j=0; j<54; j++, z+=2)
                     *z =
                           (z[-5]+z[+5]) * .0180326793f
                         - (z[-3]+z[+3]) * .1145915613f
                         + (z[-1]+z[+1]) * .5973859429f;
 
-                c2 /= 2;
+                InnovationGain /= 2;
             }
         }
 
+        /* Excitation */
         for(j=0; j<108; j++)
-            p->DecompressedBlock[108*i + j] = c2*Window[5+j] + c1*p->d[216 + 108*i + j - o];
+            p->DecompressedBlock[108*i + j] = InnovationGain*Window[5+j] + PitchGain*p->Delay[216 - Phase + 108*i + j];
     }
 
-    memcpy(p->d, &p->DecompressedBlock[108], 324*sizeof(DWORD));
+    memcpy(p->Delay, &p->DecompressedBlock[108], 324*sizeof(float));
 
     for(i=0; i<4; i++){
         for(j=0; j<12; j++)
-            p->c[64+j] += Matrix[j];
+            p->ImpulseTrain[j] += Matrix[j];
 
-        Unknown2(p, i*12, (i!=3) ? 1 : 33);
+        Synthesize(p, i*12, (i!=3) ? 1 : 33);
     }
 }
 
-void Unknown1(utkparams_t *p, int Branch, float * Window, int Interval){
+void LatticeFilter(utkparams_t *p, int Voiced, float * Window, int Interval){
-    if(Branch != 0){
+    if(Voiced){
-        unsigned a = 0;
+        int t = 0;
-        unsigned i = 0;
+        int i = 0;
         while(i<108){
-            unsigned value = UTKTable2[(a<<8) | (p->x&0xFF)];
+            unsigned code = UTKTable2[(t<<8) | (p->UnreadBitsValue&0xFF)];
-            a = (value<2 || value>8);
+            t = (code<2 || code>8);
-            ReadBits(p, UTKTable3[value]);
+            ReadBits(p, UTKTable3[code]);
 
-            if(value >= 4){
+            if(code >= 4){
-                Window[i] = UTKTable4[value];
+                Window[i] = UTKTable4[code];
                 i += Interval;
             }else{
-                if(value > 1){
+                if(code > 1){
-                    unsigned x = ReadBits(p, 6)+7;
+                    int x = (int)ReadBits(p, 6)+7;
                     if(x > (108 - i)/Interval)
                         x = (108 - i)/Interval;
 
@@ -261,10 +264,11 @@ void Unknown1(utkparams_t *p, int Branch, float * Window, int Interval){
             }
         }
     }else{
+        /* Unvoiced signal; load noise */
         int i;
         for(i=0; i<108; i+=Interval){
             uint8_t b;
-            switch(p->x & 3){
+            switch(p->UnreadBitsValue & 3){
             case 3:
                 Window[i] = 2.0;
                 b = 2;
@@ -283,43 +287,44 @@ void Unknown1(utkparams_t *p, int Branch, float * Window, int Interval){
     }
 }
 
-void Unknown2(utkparams_t *p, unsigned Sample, unsigned Blocks){
+void Synthesize(utkparams_t *p, unsigned Sample, unsigned Blocks){
-    unsigned i,j;
+    float Residual[12];
-    float Matrix[12];
+    unsigned Samples = Blocks*12;
-    int offset = 75;
+    int offset = -1;
-    Unknown2_1(&p->c[64], Matrix);
+    PredictionFilter(p->ImpulseTrain, Residual);
 
-    for(i=0; i<Blocks*12; i++){
+    while(Samples--){
+        int i;
         float x = p->DecompressedBlock[Sample];
-        for(j=0; j<12; j++){
+        for(i=0; i<12; i++){
-            if(++offset == 88) offset = 76;
+            if(++offset == 12) offset = 0;
-            x += p->c[offset] * Matrix[j];
+            x += p->R[offset] * Residual[i];
         }
-        p->c[offset--] = x;
+        p->R[offset--] = x;
         p->DecompressedBlock[Sample++] = x;
     }
 }
 
-void Unknown2_1(float *__restrict c64, float *__restrict Matrix){
+void PredictionFilter(const float *__restrict c2, float *__restrict Residual){
     int i,j;
-    float LocalMatrix1[12];
+    float M1[12];
-    float LocalMatrix2[12];
+    float M2[12];
-    LocalMatrix2[0] = 1;
+    M2[0] = 1;
-    memcpy(&LocalMatrix2[1], c64, 11*sizeof(float));
+    memcpy(&M2[1], c2, 11*sizeof(float));
 
     for(i=0; i<12; i++){
         float x = 0;
         for(j=11; j>=0; j--){
-            x -= c64[j] * LocalMatrix2[j];
+            x -= c2[j] * M2[j];
             if(j != 11)
-                LocalMatrix2[j+1] = x*c64[j] + LocalMatrix2[j];
+                M2[j+1] = x*c2[j] + M2[j];
         }
-        LocalMatrix2[0] = x;
+        M2[0] = x;
-        LocalMatrix1[i] = x;
+        M1[i] = x;
 
         for(j=0; j<i; j++)
-            x -= LocalMatrix1[i-j-1] * Matrix[j];
+            x -= M1[i-j-1] * Residual[j];
 
-        Matrix[i] = x;
+        Residual[i] = x;
     }
 }

Libraries/FileHandler/utk/read_utk.h

@@ -1,5 +1,5 @@
 /*
-    read_utk.h - Copyright (c) 2011 Fatbag <X-Fi6@phppoll.org>
+    read_utk.h - Copyright (c) 2011-2012 Fatbag <X-Fi6@phppoll.org>
 
     Permission to use, copy, modify, and/or distribute this software for any
     purpose with or without fee is hereby granted, provided that the above
@@ -33,12 +33,15 @@ typedef struct
 } utkheader_t;
 
 typedef struct {
-	const uint8_t *InData;
+    const uint8_t *InData;
-	unsigned x, y;
+    unsigned UnreadBitsValue, UnreadBitsCount;
-	unsigned a, b;
+    int UseLattice;
-	float c[88];
+    unsigned NoiseFloor;
-	float d[324];
+    float FixedCodebook[64]; /* Fixed codebook gain matrix */
-	float DecompressedBlock[432];
+    float ImpulseTrain[12]; /* Impulse train matrix */
+    float R[12]; /* Autocorrelation coefficient matrix */
+    float Delay[324];
+    float DecompressedBlock[432];
 } utkparams_t;
 
 #ifdef __cplusplus
@@ -48,12 +51,12 @@ extern "C" {
 int utk_read_header(utkheader_t * UTKHeader, const uint8_t * Buffer, unsigned FileSize);
 int utk_decode(const uint8_t *__restrict InBuffer, uint8_t *__restrict OutBuffer, unsigned Frames);
 void UTKGenerateTables(void);
-uint8_t ReadCC(utkparams_t *p, uint8_t i);
+uint8_t ReadCC(utkparams_t *p, uint8_t bits);
 void SetUTKParameters(utkparams_t *p);
 void DecompressBlock(utkparams_t *p);
-void Unknown1(utkparams_t *p, int Branch, float * Window, int Interval);
+void LatticeFilter(utkparams_t *p, int Voiced, float * Window, int Interval);
-void Unknown2(utkparams_t *p, unsigned Sample, unsigned Blocks);
+void Synthesize(utkparams_t *p, unsigned Sample, unsigned Blocks);
-void Unknown2_1(float *__restrict c64, float *__restrict Matrix);
+void PredictionFilter(const float *__restrict c2, float *__restrict Residual);
 
 #ifdef __cplusplus
 }

Libraries/FileHandler/utk/utkdecode.c

@@ -1,5 +1,5 @@
 /*
-    utkdecode.c - Copyright (c) 2011 Fatbag <X-Fi6@phppoll.org>
+    utkdecode.c - Copyright (c) 2011-2012 Fatbag <X-Fi6@phppoll.org>
 
     Permission to use, copy, modify, and/or distribute this software for any
     purpose with or without fee is hereby granted, provided that the above
@@ -39,6 +39,7 @@ int main(int argc, char *argv[]){
     DWORD bytestransferred = 0;
     uint8_t * UTKData;
     utkheader_t UTKHeader;
+    unsigned BeginningTime, EndingTime;
 
     if(argc == 1 || !strcmp(argv[1], "-h") || !strcmp(argv[1], "--help")){
         printf("Usage: utkdecode [-f] infile outfile\n"
@@ -108,10 +109,12 @@ int main(int argc, char *argv[]){
 
         UTKGenerateTables();
         
+        BeginningTime = GetTickCount();
         if(!utk_decode(UTKData+32, WaveData+44, UTKHeader.Frames)){
             printf("%sMemory for this file could not be allocated.", "utkdecode: error: ");
             return -1;
         }
+        EndingTime = GetTickCount();
 
         HeapFree(ProcessHeap, HEAP_NO_SERIALIZE, UTKData);
 
@@ -156,6 +159,8 @@ int main(int argc, char *argv[]){
                 return -1;
             }
         }
+        printf("Extracted %u bytes in %.2f seconds.\n", (unsigned) UTKHeader.dwOutSize,
+            ((float) (EndingTime - BeginningTime))/1000);
         WriteFile(hFile, WaveData, 44+UTKHeader.dwOutSize, &bytestransferred, NULL);
         CloseHandle(hFile);
     }

Makefile

@@ -24,8 +24,8 @@ LDFLAGS = -m32 -static -static-libgcc
 ARFLAGS = rcs
 RCFLAGS = -F pe-i386
 
-CFLAGS_LANG_C   =
+CFLAGS_LANG_C   = -ansi
-CFLAGS_LANG_CPP =
+CFLAGS_LANG_CPP = -std=c++98
 
 ####
 ## [Profiles]
@@ -42,7 +42,14 @@ LDFLAGS_SPEED = $(LDFLAGS) -s -flto
 CFLAGS_DEBUG  = $(CFLAGS) -O0 -g3
 LDFLAGS_DEBUG = $(LDFLAGS)
 
-WARNINGS = -Wall -Wextra -pedantic
+WARNINGS = -Wall -Wextra -Wabi -pedantic
+
+ifeq($(debug), yes)
+    CFLAGS_SIZE = $(CFLAGS_DEBUG)
+    CFLAGS_SPEED = $(CFLAGS_DEBUG)
+    LDFLAGS_SIZE = $(LDFLAGS_DEBUG)
+    LDFLAGS_SPEED = $(LDFLAGS_DEBUG)
+endif
 
 
 ####
@@ -67,6 +74,8 @@ else ifeq ($(pgo),optimize)
     CFLAGS  += -fprofile-use
 endif
 
+niotso_buildsys = 1
+
 
 ####
 ## [Targets]
@@ -74,9 +83,9 @@ endif
 include packages.makefile
 
 filter_obj = *.o *.lo *.la *.Plo *.Pla *.gch *.pch *.obj *.res *.exp *.dep *.aps *.intermediate.manifest
-filter_exe = *.exe *.dll *.so *.a *.lib
+filter_exe = *.a *.lib $(niotso_exes) $(niotso_dlls)
 filter_profile = *.gcda
-filter_dist =  *.dsp *.dsw *.user *.ncb *.pdb *.idb *.opt *.plg *.suo */BuildLog.htm
+filter_dist =  *.dsp *.dsw *.user *.ncb *.pdb *.idb *.opt *.plg *.suo BuildLog.htm
 
 objclean:
 	$(RM_R) $(filter_obj)

Server/COPYING

@@ -0,0 +1,621 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
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+pattern of such abuse occurs in the area of products for individuals to
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+stand ready to extend this provision to those domains in future versions
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+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
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+                     END OF TERMS AND CONDITIONS