-Took cook_random() from an old cook.c revision [6 mar 2007], which is a

simple RNG, to eliminate the need for lfg.c/h.
-Remove lfg.c/h and md5.c/h as they are no longer needed and use the 
more common form of my name in docs/COMMITTERS.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20915 a1c6a512-1295-4272-9138-f99709370657

8 files changed, 15 insertions, 341 deletions

diff --git a/apps/codecs/libcook/Makefile.test b/apps/codecs/libcook/Makefile.test
index 7f804e40f6..cb8630d180 100644
--- a/apps/codecs/libcook/Makefile.test
+++ b/apps/codecs/libcook/Makefile.test
@@ -1,5 +1,5 @@
 CFLAGS = -Wall -O3
-OBJS = main.o bitstream.o cook.o libavutil/log.o libavutil/mem.o libavutil/lfg.o libavutil/md5.o rm2wav.o
+OBJS = main.o bitstream.o cook.o libavutil/log.o libavutil/mem.o rm2wav.o
 cooktest: $(OBJS)
 	gcc -o cooktest $(OBJS)
 
diff --git a/apps/codecs/libcook/cook.c b/apps/codecs/libcook/cook.c
index bd72179cbd..5b2c59a6c5 100644
--- a/apps/codecs/libcook/cook.c
+++ b/apps/codecs/libcook/cook.c
@@ -71,6 +71,17 @@ const uint8_t ff_log2_tab[256]={
 #define MAX_SUBPACKETS   5
 //#define COOKDEBUG
 #define DEBUGF(message,args ...) av_log(NULL,AV_LOG_ERROR,message,## args)
+
+/**
+ * Random bit stream generator.
+ */
+static int inline cook_random(COOKContext *q)
+{
+    q->random_state =
+      q->random_state * 214013 + 2531011; /* typical RNG numbers */
+
+    return (q->random_state/0x1000000)&1;  /*>>31*/
+}
 #include "cook_fixpoint.h"
 
 /* debug functions */
@@ -742,7 +753,7 @@ av_cold int cook_decode_init(RMContext *rmctx, COOKContext *q)
     q->bit_rate = rmctx->bit_rate;  
 
     /* Initialize RNG. */
-    av_lfg_init(&q->random_state, 1);
+    q->random_state = 0;
 
     /* Initialize extradata related variables. */
     q->samples_per_channel = q->samples_per_frame / q->nb_channels;
diff --git a/apps/codecs/libcook/cook.h b/apps/codecs/libcook/cook.h
index e34883255b..ee60ba01c9 100644
--- a/apps/codecs/libcook/cook.h
+++ b/apps/codecs/libcook/cook.h
@@ -23,7 +23,6 @@
 #define _COOK_H
 
 #include <stdint.h>
-#include "libavutil/lfg.h"
 #include "bitstream.h"
 #include "bytestream.h"
 #include "rm2wav.h"
@@ -66,7 +65,7 @@ typedef struct cook {
     int                 bits_per_subpacket;
     int                 cookversion;
     /* states */
-    AVLFG               random_state;
+    int                 random_state;
 
     /* gain buffers */
     cook_gains          gains1;
diff --git a/apps/codecs/libcook/cook_fixpoint.h b/apps/codecs/libcook/cook_fixpoint.h
index b8182bfcd0..83c054c527 100644
--- a/apps/codecs/libcook/cook_fixpoint.h
+++ b/apps/codecs/libcook/cook_fixpoint.h
@@ -110,7 +110,7 @@ static void scalar_dequant_math(COOKContext *q, int index,
     for(i=0 ; i<SUBBAND_SIZE ; i++) {
         f = table[subband_coef_index[i]];
         /* noise coding if subband_coef_index[i] == 0 */
-        if (((subband_coef_index[i] == 0) && av_lfg_get(&q->random_state) < 0x80000000) ||
+        if (((subband_coef_index[i] == 0) && cook_random(q)) ||
             ((subband_coef_index[i] != 0) && subband_coef_sign[i]))
             f = -f;
 
diff --git a/apps/codecs/libcook/libavutil/lfg.c b/apps/codecs/libcook/libavutil/lfg.c
deleted file mode 100644
index 337ee9e41c..0000000000
--- a/apps/codecs/libcook/libavutil/lfg.c
+++ /dev/null
@@ -1,64 +0,0 @@
-/*
- * Lagged Fibonacci PRNG
- * Copyright (c) 2008 Michael Niedermayer
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg 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
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include <inttypes.h>
-#include "lfg.h"
-#include "md5.h"
-#include "intreadwrite.h"
-
-void av_cold av_lfg_init(AVLFG *c, unsigned int seed){
-    uint8_t tmp[16]={0};
-    int i;
-
-    for(i=8; i<64; i+=4){
-        AV_WL32(tmp, seed); tmp[4]=i;
-        av_md5_sum(tmp, tmp,  16);
-        c->state[i  ]= AV_RL32(tmp);
-        c->state[i+1]= AV_RL32(tmp+4);
-        c->state[i+2]= AV_RL32(tmp+8);
-        c->state[i+3]= AV_RL32(tmp+12);
-    }
-    c->index=0;
-}
-
-#ifdef TEST
-#include "log.h"
-#include "common.h"
-
-int main(void)
-{
-    int x=0;
-    int i, j;
-    AVLFG state;
-
-    av_lfg_init(&state, 0xdeadbeef);
-    for (j = 0; j < 10000; j++) {
-        START_TIMER
-        for (i = 0; i < 624; i++) {
-//            av_log(NULL,AV_LOG_ERROR, "%X\n", av_lfg_get(&state));
-            x+=av_lfg_get(&state);
-        }
-        STOP_TIMER("624 calls of av_random");
-    }
-    av_log(NULL, AV_LOG_ERROR, "final value:%X\n", x);
-    return 0;
-}
-#endif
diff --git a/apps/codecs/libcook/libavutil/lfg.h b/apps/codecs/libcook/libavutil/lfg.h
deleted file mode 100644
index 3250c18e79..0000000000
--- a/apps/codecs/libcook/libavutil/lfg.h
+++ /dev/null
@@ -1,54 +0,0 @@
-/*
- * Lagged Fibonacci PRNG
- * Copyright (c) 2008 Michael Niedermayer
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg 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
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#ifndef AVUTIL_LFG_H
-#define AVUTIL_LFG_H
-
-typedef struct {
-    unsigned int state[64];
-    int index;
-} AVLFG;
-
-void av_lfg_init(AVLFG *c, unsigned int seed);
-
-/**
- * Gets the next random unsigned 32-bit number using an ALFG.
- *
- * Please also consider a simple LCG like state= state*1664525+1013904223,
- * it may be good enough and faster for your specific use case.
- */
-static inline unsigned int av_lfg_get(AVLFG *c){
-    c->state[c->index & 63] = c->state[(c->index-24) & 63] + c->state[(c->index-55) & 63];
-    return c->state[c->index++ & 63];
-}
-
-/**
- * Gets the next random unsigned 32-bit number using a MLFG.
- *
- * Please also consider av_lfg_get() above, it is faster.
- */
-static inline unsigned int av_mlfg_get(AVLFG *c){
-    unsigned int a= c->state[(c->index-55) & 63];
-    unsigned int b= c->state[(c->index-24) & 63];
-    return c->state[c->index++ & 63] = 2*a*b+a+b;
-}
-
-#endif /* AVUTIL_LFG_H */
diff --git a/apps/codecs/libcook/libavutil/md5.c b/apps/codecs/libcook/libavutil/md5.c
deleted file mode 100644
index 26d1fb3874..0000000000
--- a/apps/codecs/libcook/libavutil/md5.c
+++ /dev/null
@@ -1,182 +0,0 @@
-/*
- * Copyright (C) 2006 Michael Niedermayer (michaelni@gmx.at)
- * Copyright (C) 2003-2005 by Christopher R. Hertel (crh@ubiqx.mn.org)
- *
- * References:
- *  IETF RFC 1321: The MD5 Message-Digest Algorithm
- *       Ron Rivest. IETF, April, 1992
- *
- * based on http://ubiqx.org/libcifs/source/Auth/MD5.c
- *          from Christopher R. Hertel (crh@ubiqx.mn.org)
- * Simplified, cleaned and IMO redundant comments removed by michael.
- *
- * If you use gcc, then version 4.1 or later and -fomit-frame-pointer is
- * strongly recommended.
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg 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
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include <string.h>
-#include "bswap.h"
-#include "md5.h"
-
-typedef struct AVMD5{
-    uint64_t len;
-    uint8_t  block[64];
-    uint32_t ABCD[4];
-} AVMD5;
-
-const int av_md5_size= sizeof(AVMD5);
-
-static const uint8_t S[4][4] = {
-    { 7, 12, 17, 22 },  /* round 1 */
-    { 5,  9, 14, 20 },  /* round 2 */
-    { 4, 11, 16, 23 },  /* round 3 */
-    { 6, 10, 15, 21 }   /* round 4 */
-};
-
-static const uint32_t T[64] = { // T[i]= fabs(sin(i+1)<<32)
-    0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee,   /* round 1 */
-    0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
-    0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
-    0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
-
-    0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa,   /* round 2 */
-    0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
-    0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
-    0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
-
-    0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,   /* round 3 */
-    0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
-    0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05,
-    0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
-
-    0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039,   /* round 4 */
-    0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
-    0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
-    0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391,
-};
-
-#define CORE(i, a, b, c, d) \
-        t = S[i>>4][i&3];\
-        a += T[i];\
-\
-        if(i<32){\
-            if(i<16) a += (d ^ (b&(c^d))) + X[      i &15 ];\
-            else     a += (c ^ (d&(c^b))) + X[ (1+5*i)&15 ];\
-        }else{\
-            if(i<48) a += (b^c^d)         + X[ (5+3*i)&15 ];\
-            else     a += (c^(b|~d))      + X[ (  7*i)&15 ];\
-        }\
-        a = b + (( a << t ) | ( a >> (32 - t) ));
-
-static void body(uint32_t ABCD[4], uint32_t X[16]){
-
-    int t;
-    int i av_unused;
-    unsigned int a= ABCD[3];
-    unsigned int b= ABCD[2];
-    unsigned int c= ABCD[1];
-    unsigned int d= ABCD[0];
-
-#ifdef WORDS_BIGENDIAN
-    for(i=0; i<16; i++)
-        X[i]= bswap_32(X[i]);
-#endif
-
-#if CONFIG_SMALL
-    for( i = 0; i < 64; i++ ){
-        CORE(i,a,b,c,d)
-        t=d; d=c; c=b; b=a; a=t;
-    }
-#else
-#define CORE2(i) CORE(i,a,b,c,d) CORE((i+1),d,a,b,c) CORE((i+2),c,d,a,b) CORE((i+3),b,c,d,a)
-#define CORE4(i) CORE2(i) CORE2((i+4)) CORE2((i+8)) CORE2((i+12))
-CORE4(0) CORE4(16) CORE4(32) CORE4(48)
-#endif
-
-    ABCD[0] += d;
-    ABCD[1] += c;
-    ABCD[2] += b;
-    ABCD[3] += a;
-}
-
-void av_md5_init(AVMD5 *ctx){
-    ctx->len    = 0;
-
-    ctx->ABCD[0] = 0x10325476;
-    ctx->ABCD[1] = 0x98badcfe;
-    ctx->ABCD[2] = 0xefcdab89;
-    ctx->ABCD[3] = 0x67452301;
-}
-
-void av_md5_update(AVMD5 *ctx, const uint8_t *src, const int len){
-    int i, j;
-
-    j= ctx->len & 63;
-    ctx->len += len;
-
-    for( i = 0; i < len; i++ ){
-        ctx->block[j++] = src[i];
-        if( 64 == j ){
-            body(ctx->ABCD, (uint32_t*) ctx->block);
-            j = 0;
-        }
-    }
-}
-
-void av_md5_final(AVMD5 *ctx, uint8_t *dst){
-    int i;
-    uint64_t finalcount= le2me_64(ctx->len<<3);
-
-    av_md5_update(ctx, "\200", 1);
-    while((ctx->len & 63)!=56)
-        av_md5_update(ctx, "", 1);
-
-    av_md5_update(ctx, (uint8_t*)&finalcount, 8);
-
-    for(i=0; i<4; i++)
-        ((uint32_t*)dst)[i]= le2me_32(ctx->ABCD[3-i]);
-}
-
-void av_md5_sum(uint8_t *dst, const uint8_t *src, const int len){
-    AVMD5 ctx[1];
-
-    av_md5_init(ctx);
-    av_md5_update(ctx, src, len);
-    av_md5_final(ctx, dst);
-}
-
-#ifdef TEST
-#include <stdio.h>
-#undef printf
-int main(void){
-    uint64_t md5val;
-    int i;
-    uint8_t in[1000];
-
-    for(i=0; i<1000; i++) in[i]= i*i;
-    av_md5_sum( (uint8_t*)&md5val, in,  1000); printf("%"PRId64"\n", md5val);
-    av_md5_sum( (uint8_t*)&md5val, in,  63); printf("%"PRId64"\n", md5val);
-    av_md5_sum( (uint8_t*)&md5val, in,  64); printf("%"PRId64"\n", md5val);
-    av_md5_sum( (uint8_t*)&md5val, in,  65); printf("%"PRId64"\n", md5val);
-    for(i=0; i<1000; i++) in[i]= i % 127;
-    av_md5_sum( (uint8_t*)&md5val, in,  999); printf("%"PRId64"\n", md5val);
-
-    return 0;
-}
-#endif
diff --git a/apps/codecs/libcook/libavutil/md5.h b/apps/codecs/libcook/libavutil/md5.h
deleted file mode 100644
index 969202a807..0000000000
--- a/apps/codecs/libcook/libavutil/md5.h
+++ /dev/null
@@ -1,36 +0,0 @@
-/*
- * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg 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
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#ifndef AVUTIL_MD5_H
-#define AVUTIL_MD5_H
-
-#include <stdint.h>
-
-extern const int av_md5_size;
-
-struct AVMD5;
-
-void av_md5_init(struct AVMD5 *ctx);
-void av_md5_update(struct AVMD5 *ctx, const uint8_t *src, const int len);
-void av_md5_final(struct AVMD5 *ctx, uint8_t *dst);
-void av_md5_sum(uint8_t *dst, const uint8_t *src, const int len);
-
-#endif /* AVUTIL_MD5_H */
-