Initial revision

Originally committed as revision 5 to svn://svn.ffmpeg.org/ffmpeg/trunk

9 files changed, 2434 insertions, 0 deletions

diff --git a/libavcodec/libac3/ac3.h b/libavcodec/libac3/ac3.h
new file mode 100644
index 0000000000..117071e7a1
--- /dev/null
+++ b/libavcodec/libac3/ac3.h
@@ -0,0 +1,108 @@
+/* 
+ *    ac3.h
+ *
+ *	Copyright (C) Aaron Holtzman - May 1999
+ *
+ *  This file is part of ac3dec, a free Dolby AC-3 stream decoder.
+ *	
+ *  ac3dec 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, or (at your option)
+ *  any later version.
+ *   
+ *  ac3dec 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 GNU Make; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 
+ *
+ *
+ */
+
+typedef struct ac3_ba_s {
+    uint16_t fsnroffst;	// fine SNR offset
+    uint16_t fgaincod;	// fast gain
+    uint16_t deltbae;	// delta bit allocation exists
+    int8_t deltba[50];	// per-band delta bit allocation
+} ac3_ba_t;
+
+typedef struct ac3_state_s {
+    uint8_t fscod;		// sample rate
+    uint8_t halfrate;		// halfrate factor
+    uint8_t acmod;		// coded channels
+    float clev;			// centre channel mix level
+    float slev;			// surround channels mix level
+    uint8_t lfeon;		// coded lfe channel
+
+    int output;			// type of output
+    float level;		// output level
+    float bias;			// output bias
+
+    uint16_t cplinu;		// coupling in use
+    uint16_t chincpl[5];	// channel coupled
+    uint16_t phsflginu;		// phase flags in use (stereo only)
+    uint16_t cplbndstrc[18];	// coupling band structure
+    uint16_t cplstrtmant;	// coupling channel start mantissa
+    uint16_t cplendmant;	// coupling channel end mantissa
+    float cplco[5][18];		// coupling coordinates
+
+    // derived information
+    uint16_t cplstrtbnd;	// coupling start band (for bit allocation)
+    uint16_t ncplbnd;		// number of coupling bands
+
+    uint16_t rematflg[4];	// stereo rematrixing
+
+    uint16_t endmant[5];	// channel end mantissa
+
+    uint8_t cpl_exp[256];	// decoded coupling channel exponents
+    uint8_t fbw_exp[5][256];	// decoded channel exponents
+    uint8_t lfe_exp[7];		// decoded lfe channel exponents
+
+    uint16_t sdcycod;		// slow decay
+    uint16_t fdcycod;		// fast decay
+    uint16_t sgaincod;		// slow gain
+    uint16_t dbpbcod;		// dB per bit - encodes the dbknee value
+    uint16_t floorcod;		// masking floor
+
+    uint16_t csnroffst;		// coarse SNR offset
+    ac3_ba_t cplba;		// coupling bit allocation parameters
+    ac3_ba_t ba[5];		// channel bit allocation parameters
+    ac3_ba_t lfeba;		// lfe bit allocation parameters
+
+    uint16_t cplfleak;		// coupling fast leak init
+    uint16_t cplsleak;		// coupling slow leak init
+
+    // derived bit allocation information
+    int8_t fbw_bap[5][256];
+    int8_t cpl_bap[256];
+    int8_t lfe_bap[7];
+} ac3_state_t;
+
+/* samples work structure */
+typedef float stream_samples_t[6][256];
+
+#define AC3_CHANNEL 0
+#define AC3_MONO 1
+#define AC3_STEREO 2
+#define AC3_3F 3
+#define AC3_2F1R 4
+#define AC3_3F1R 5
+#define AC3_2F2R 6
+#define AC3_3F2R 7
+#define AC3_CHANNEL1 8
+#define AC3_CHANNEL2 9
+#define AC3_DOLBY 10
+#define AC3_CHANNEL_MASK 15
+
+#define AC3_LFE 16
+#define AC3_ADJUST_LEVEL 32
+
+void ac3_init (void);
+int ac3_syncinfo (uint8_t * buf, int * flags,
+		  int * sample_rate, int * bit_rate);
+int ac3_frame (ac3_state_t * state, uint8_t * buf, int * flags,
+	       float * level, float bias);
+int ac3_block (ac3_state_t * state);
diff --git a/libavcodec/libac3/ac3_internal.h b/libavcodec/libac3/ac3_internal.h
new file mode 100644
index 0000000000..1dce513f4c
--- /dev/null
+++ b/libavcodec/libac3/ac3_internal.h
@@ -0,0 +1,51 @@
+/* 
+ *    ac3_internal.h
+ *
+ *	Copyright (C) Aaron Holtzman - May 1999
+ *
+ *  This file is part of ac3dec, a free Dolby AC-3 stream decoder.
+ *	
+ *  ac3dec 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, or (at your option)
+ *  any later version.
+ *   
+ *  ac3dec 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 GNU Make; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 
+ *
+ */
+
+#define LEVEL_PLUS3DB 1.4142135623730951
+#define LEVEL_3DB 0.7071067811865476
+#define LEVEL_45DB 0.5946035575013605
+#define LEVEL_6DB 0.5
+
+/* Exponent strategy constants */
+#define EXP_REUSE (0)
+#define EXP_D15   (1)
+#define EXP_D25   (2)
+#define EXP_D45   (3)
+
+/* Delta bit allocation constants */
+#define DELTA_BIT_REUSE (0)
+#define DELTA_BIT_NEW (1)
+#define DELTA_BIT_NONE (2)
+#define DELTA_BIT_RESERVED (3)
+
+void bit_allocate (ac3_state_t * state, ac3_ba_t * ba, int bndstart,
+		   int start, int end, int fastleak, int slowleak,
+		   uint8_t * exp, int8_t * bap);
+
+int downmix_init (int input, int flags, float * level, float clev, float slev);
+void downmix (float * samples, int acmod, int output, float level, float bias,
+	      float clev, float slev);
+
+void imdct_init (void);
+extern void (* imdct_256) (float data[], float delay[]);
+extern void (* imdct_512) (float data[], float delay[]);
diff --git a/libavcodec/libac3/bit_allocate.c b/libavcodec/libac3/bit_allocate.c
new file mode 100644
index 0000000000..307c0074c6
--- /dev/null
+++ b/libavcodec/libac3/bit_allocate.c
@@ -0,0 +1,255 @@
+/* 
+ *  bit_allocate.c
+ *
+ *	Copyright (C) Aaron Holtzman - May 1999
+ *
+ *  This file is part of ac3dec, a free Dolby AC-3 stream decoder.
+ *	
+ *  ac3dec 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, or (at your option)
+ *  any later version.
+ *   
+ *  ac3dec 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 GNU Make; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 
+ *
+ */
+
+#include <inttypes.h>
+#include <stdlib.h>
+#include <string.h>
+#include "ac3.h"
+#include "ac3_internal.h"
+
+static int hthtab[3][50] = {
+    {0x730, 0x730, 0x7c0, 0x800, 0x820, 0x840, 0x850, 0x850, 0x860, 0x860,
+     0x860, 0x860, 0x860, 0x870, 0x870, 0x870, 0x880, 0x880, 0x890, 0x890,
+     0x8a0, 0x8a0, 0x8b0, 0x8b0, 0x8c0, 0x8c0, 0x8d0, 0x8e0, 0x8f0, 0x900,
+     0x910, 0x910, 0x910, 0x910, 0x900, 0x8f0, 0x8c0, 0x870, 0x820, 0x7e0,
+     0x7a0, 0x770, 0x760, 0x7a0, 0x7c0, 0x7c0, 0x6e0, 0x400, 0x3c0, 0x3c0},
+    {0x710, 0x710, 0x7a0, 0x7f0, 0x820, 0x830, 0x840, 0x850, 0x850, 0x860,
+     0x860, 0x860, 0x860, 0x860, 0x870, 0x870, 0x870, 0x880, 0x880, 0x880,
+     0x890, 0x890, 0x8a0, 0x8a0, 0x8b0, 0x8b0, 0x8c0, 0x8c0, 0x8e0, 0x8f0,
+     0x900, 0x910, 0x910, 0x910, 0x910, 0x900, 0x8e0, 0x8b0, 0x870, 0x820,
+     0x7e0, 0x7b0, 0x760, 0x770, 0x7a0, 0x7c0, 0x780, 0x5d0, 0x3c0, 0x3c0},
+    {0x680, 0x680, 0x750, 0x7b0, 0x7e0, 0x810, 0x820, 0x830, 0x840, 0x850,
+     0x850, 0x850, 0x860, 0x860, 0x860, 0x860, 0x860, 0x860, 0x860, 0x860,
+     0x870, 0x870, 0x870, 0x870, 0x880, 0x880, 0x880, 0x890, 0x8a0, 0x8b0,
+     0x8c0, 0x8d0, 0x8e0, 0x8f0, 0x900, 0x910, 0x910, 0x910, 0x900, 0x8f0,
+     0x8d0, 0x8b0, 0x840, 0x7f0, 0x790, 0x760, 0x7a0, 0x7c0, 0x7b0, 0x720}
+};
+
+static int8_t baptab[305] = {
+    16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+    16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+    16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+    16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+    16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+    16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,	// 93 padding entries
+
+    16, 16, 16, 16, 16, 16, 16, 16, 16, 14, 14, 14, 14, 14, 14, 14,
+    14, 12, 12, 12, 12, 11, 11, 11, 11, 10, 10, 10, 10,  9,  9,  9,
+     9,  8,  8,  8,  8,  7,  7,  7,  7,  6,  6,  6,  6,  5,  5,  5,
+     5,  4,  4, -3, -3,  3,  3,  3, -2, -2, -1, -1, -1, -1, -1,  0,
+
+     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0					// 148 padding entries
+};
+
+static int bndtab[30] = {21, 22,  23,  24,  25,  26,  27,  28,  31,  34,
+			 37, 40,  43,  46,  49,  55,  61,  67,  73,  79,
+			 85, 97, 109, 121, 133, 157, 181, 205, 229, 253};
+
+static int8_t latab[256] = {
+    -64, -63, -62, -61, -60, -59, -58, -57, -56, -55, -54, -53,
+    -52, -52, -51, -50, -49, -48, -47, -47, -46, -45, -44, -44,
+    -43, -42, -41, -41, -40, -39, -38, -38, -37, -36, -36, -35,
+    -35, -34, -33, -33, -32, -32, -31, -30, -30, -29, -29, -28,
+    -28, -27, -27, -26, -26, -25, -25, -24, -24, -23, -23, -22,
+    -22, -21, -21, -21, -20, -20, -19, -19, -19, -18, -18, -18,
+    -17, -17, -17, -16, -16, -16, -15, -15, -15, -14, -14, -14,
+    -13, -13, -13, -13, -12, -12, -12, -12, -11, -11, -11, -11,
+    -10, -10, -10, -10, -10,  -9,  -9,  -9,  -9,  -9,  -8,  -8,
+     -8,  -8,  -8,  -8,  -7,  -7,  -7,  -7,  -7,  -7,  -6,  -6,
+     -6,  -6,  -6,  -6,  -6,  -6,  -5,  -5,  -5,  -5,  -5,  -5,
+     -5,  -5,  -4,  -4,  -4,  -4,  -4,  -4,  -4,  -4,  -4,  -4,
+     -4,  -3,  -3,  -3,  -3,  -3,  -3,  -3,  -3,  -3,  -3,  -3,
+     -3,  -3,  -3,  -2,  -2,  -2,  -2,  -2,  -2,  -2,  -2,  -2,
+     -2,  -2,  -2,  -2,  -2,  -2,  -2,  -2,  -2,  -2,  -1,  -1,
+     -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,
+     -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,
+     -1,  -1,  -1,  -1,  -1,  -1,   0,   0,   0,   0,   0,   0,
+      0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+      0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+      0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+      0,   0,   0,   0
+};
+
+#define UPDATE_LEAK() 		\
+do {				\
+    fastleak += fdecay;		\
+    if (fastleak > psd + fgain)	\
+	fastleak = psd + fgain;	\
+    slowleak += sdecay;		\
+    if (slowleak > psd + sgain)	\
+	slowleak = psd + sgain;	\
+} while (0)
+
+#define COMPUTE_MASK()				\
+do {						\
+    if (psd > dbknee)				\
+	mask -= (psd - dbknee) >> 2;		\
+    if (mask > hth [i >> halfrate])		\
+	mask = hth [i >> halfrate];		\
+    mask -= snroffset + 128 * deltba[i];	\
+    mask = (mask > 0) ? 0 : ((-mask) >> 5);	\
+    mask -= floor;				\
+} while (0)
+
+void bit_allocate (ac3_state_t * state, ac3_ba_t * ba, int bndstart,
+		   int start, int end, int fastleak, int slowleak,
+		   uint8_t * exp, int8_t * bap)
+{
+    static int slowgain[4] = {0x540, 0x4d8, 0x478, 0x410};
+    static int dbpbtab[4]  = {0xc00, 0x500, 0x300, 0x100};
+    static int floortab[8] = {0x910, 0x950, 0x990, 0x9d0,
+			      0xa10, 0xa90, 0xb10, 0x1400};
+
+    int i, j;
+    int fdecay, fgain, sdecay, sgain, dbknee, floor, snroffset;
+    int psd, mask;
+    int8_t * deltba;
+    int * hth;
+    int halfrate;
+
+    halfrate = state->halfrate;
+    fdecay = (63 + 20 * state->fdcycod) >> halfrate;
+    fgain = 128 + 128 * ba->fgaincod;
+    sdecay = (15 + 2 * state->sdcycod) >> halfrate;
+    sgain = slowgain[state->sgaincod];
+    dbknee = dbpbtab[state->dbpbcod];
+    hth = hthtab[state->fscod];
+    /*
+     * if there is no delta bit allocation, make deltba point to an area
+     * known to contain zeroes. baptab+156 here.
+     */
+    deltba = (ba->deltbae == DELTA_BIT_NONE) ? baptab + 156 : ba->deltba;
+    floor = floortab[state->floorcod];
+    snroffset = 960 - 64 * state->csnroffst - 4 * ba->fsnroffst + floor;
+    floor >>= 5;
+
+    i = bndstart;
+    j = start;
+    if (start == 0) {	// not the coupling channel
+	int lowcomp;
+
+	lowcomp = 0;
+	j = end - 1;
+	do {
+	    if (i < j) {
+		if (exp[i+1] == exp[i] - 2)
+		    lowcomp = 384;
+		else if (lowcomp && (exp[i+1] > exp[i]))
+		    lowcomp -= 64;
+	    }
+	    psd = 128 * exp[i];
+	    mask = psd + fgain + lowcomp;
+	    COMPUTE_MASK ();
+	    bap[i++] = (baptab+156)[mask + 4 * exp[i]];
+	} while ((i < 3) || ((i < 7) && (exp[i] > exp[i-1])));
+	fastleak = psd + fgain;
+	slowleak = psd + sgain;
+
+	while (i < 7) {
+	    if (i < j) {
+		if (exp[i+1] == exp[i] - 2)
+		    lowcomp = 384;
+		else if (lowcomp && (exp[i+1] > exp[i]))
+		    lowcomp -= 64;
+	    }
+	    psd = 128 * exp[i];
+	    UPDATE_LEAK ();
+	    mask = ((fastleak + lowcomp < slowleak) ?
+		    fastleak + lowcomp : slowleak);
+	    COMPUTE_MASK ();
+	    bap[i++] = (baptab+156)[mask + 4 * exp[i]];
+	}
+
+	if (end == 7)	// lfe channel
+	    return;
+
+	do {
+	    if (exp[i+1] == exp[i] - 2)
+		lowcomp = 320;
+	    else if (lowcomp && (exp[i+1] > exp[i]))
+		lowcomp -= 64;
+	    psd = 128 * exp[i];
+	    UPDATE_LEAK ();
+	    mask = ((fastleak + lowcomp < slowleak) ?
+		    fastleak + lowcomp : slowleak);
+	    COMPUTE_MASK ();
+	    bap[i++] = (baptab+156)[mask + 4 * exp[i]];
+	} while (i < 20);
+
+	while (lowcomp > 128) {		// two iterations maximum
+	    lowcomp -= 128;
+	    psd = 128 * exp[i];
+	    UPDATE_LEAK ();
+	    mask = ((fastleak + lowcomp < slowleak) ?
+		    fastleak + lowcomp : slowleak);
+	    COMPUTE_MASK ();
+	    bap[i++] = (baptab+156)[mask + 4 * exp[i]];
+	}
+	j = i;
+    }
+
+    do {
+	int startband, endband;
+
+	startband = j;
+	endband = ((bndtab-20)[i] < end) ? (bndtab-20)[i] : end;
+	psd = 128 * exp[j++];
+	while (j < endband) {
+	    int next, delta;
+
+	    next = 128 * exp[j++];
+	    delta = next - psd;
+	    switch (delta >> 9) {
+	    case -6: case -5: case -4: case -3: case -2:
+		psd = next;
+		break;
+	    case -1:
+		psd = next + latab[(-delta) >> 1];
+		break;
+	    case 0:
+		psd += latab[delta >> 1];
+		break;
+	    }
+	}
+	// minpsd = -289
+	UPDATE_LEAK ();
+	mask = (fastleak < slowleak) ? fastleak : slowleak;
+	COMPUTE_MASK ();
+	i++;
+	j = startband;
+	do {
+	    // max(mask+4*exp)=147=-(minpsd+fgain-deltba-snroffset)>>5+4*exp
+	    // min(mask+4*exp)=-156=-(sgain-deltba-snroffset)>>5
+	    bap[j++] = (baptab+156)[mask + 4 * exp[j]];
+	} while (j < endband);
+    } while (j < end);
+}
diff --git a/libavcodec/libac3/bitstream.c b/libavcodec/libac3/bitstream.c
new file mode 100644
index 0000000000..7e9bd1f66a
--- /dev/null
+++ b/libavcodec/libac3/bitstream.c
@@ -0,0 +1,77 @@
+/* 
+ *  bitstream.c
+ *
+ *	Copyright (C) Aaron Holtzman - Dec 1999
+ *
+ *  This file is part of ac3dec, a free AC-3 audio decoder
+ *	
+ *  ac3dec 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, or (at your option)
+ *  any later version.
+ *   
+ *  ac3dec 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 GNU Make; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 
+ *
+ */
+
+#include <inttypes.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "ac3.h"
+#include "ac3_internal.h"
+#include "bitstream.h"
+
+#define BUFFER_SIZE 4096
+
+static uint8_t *buffer_start;
+
+uint32_t bits_left;
+uint32_t current_word;
+
+void bitstream_set_ptr (uint8_t * buf)
+{
+    buffer_start = buf;
+    bits_left = 0;
+}
+
+static inline void
+bitstream_fill_current()
+{
+    current_word = *((uint32_t*)buffer_start)++;
+    current_word = swab32(current_word);
+}
+
+//
+// The fast paths for _get is in the
+// bitstream.h header file so it can be inlined.
+//
+// The "bottom half" of this routine is suffixed _bh
+//
+// -ah
+//
+
+uint32_t
+bitstream_get_bh(uint32_t num_bits)
+{
+    uint32_t result;
+
+    num_bits -= bits_left;
+    result = (current_word << (32 - bits_left)) >> (32 - bits_left);
+
+    bitstream_fill_current();
+
+    if(num_bits != 0)
+	result = (result << num_bits) | (current_word >> (32 - num_bits));
+	
+    bits_left = 32 - num_bits;
+
+    return result;
+}
diff --git a/libavcodec/libac3/bitstream.h b/libavcodec/libac3/bitstream.h
new file mode 100644
index 0000000000..84f3287c87
--- /dev/null
+++ b/libavcodec/libac3/bitstream.h
@@ -0,0 +1,68 @@
+/* 
+ *  bitstream.h
+ *
+ *	Copyright (C) Aaron Holtzman - Dec 1999
+ *
+ *  This file is part of ac3dec, a free AC-3 audio decoder
+ *	
+ *  ac3dec 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, or (at your option)
+ *  any later version.
+ *   
+ *  ac3dec 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 GNU Make; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 
+ *
+ */
+
+//My new and improved vego-matic endian swapping routine
+//(stolen from the kernel)
+#ifdef WORDS_BIGENDIAN
+
+#	define swab32(x) (x)
+
+#else
+
+#	if defined (__i386__)
+
+#	define swab32(x) __i386_swab32(x)
+	static inline const uint32_t __i386_swab32(uint32_t x)
+	{
+		__asm__("bswap %0" : "=r" (x) : "0" (x));
+		return x;
+	}
+
+#	else
+
+#	define swab32(x)\
+((((uint8_t*)&x)[0] << 24) | (((uint8_t*)&x)[1] << 16) |  \
+ (((uint8_t*)&x)[2] << 8)  | (((uint8_t*)&x)[3]))
+
+#	endif
+#endif
+
+extern uint32_t bits_left;
+extern uint32_t current_word;
+
+void bitstream_set_ptr (uint8_t * buf);
+uint32_t bitstream_get_bh(uint32_t num_bits);
+
+static inline uint32_t 
+bitstream_get(uint32_t num_bits)
+{
+    uint32_t result;
+	
+    if(num_bits < bits_left) {
+	result = (current_word << (32 - bits_left)) >> (32 - num_bits);
+	bits_left -= num_bits;
+	return result;
+    }
+
+    return bitstream_get_bh(num_bits);
+}
diff --git a/libavcodec/libac3/downmix.c b/libavcodec/libac3/downmix.c
new file mode 100644
index 0000000000..9e7fbfb8b6
--- /dev/null
+++ b/libavcodec/libac3/downmix.c
@@ -0,0 +1,533 @@
+/*
+ *
+ *  downmix.c
+ *    
+ *	Copyright (C) Aaron Holtzman - Sept 1999
+ *
+ *	Originally based on code by Yuqing Deng.
+ *
+ *  This file is part of ac3dec, a free Dolby AC-3 stream decoder.
+ *	
+ *  ac3dec 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, or (at your option)
+ *  any later version.
+ *   
+ *  ac3dec 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 GNU Make; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 
+ *
+ *
+ */
+
+#include <inttypes.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+#include <string.h>
+#include "ac3.h"
+#include "ac3_internal.h"
+
+
+#define CONVERT(acmod,output) (((output) << 3) + (acmod))
+
+int downmix_init (int input, int flags, float * level, float clev, float slev)
+{
+    static uint8_t table[11][8] = {
+	{AC3_CHANNEL,  AC3_DOLBY,  AC3_STEREO, AC3_STEREO,
+	 AC3_STEREO,   AC3_STEREO, AC3_STEREO, AC3_STEREO},
+	{AC3_MONO,     AC3_MONO,   AC3_MONO,   AC3_MONO,
+	 AC3_MONO,     AC3_MONO,   AC3_MONO,   AC3_MONO},
+	{AC3_CHANNEL,  AC3_DOLBY,  AC3_STEREO, AC3_STEREO,
+	 AC3_STEREO,   AC3_STEREO, AC3_STEREO, AC3_STEREO},
+	{AC3_CHANNEL,  AC3_DOLBY,  AC3_STEREO, AC3_3F,
+	 AC3_STEREO,   AC3_3F,     AC3_STEREO, AC3_3F},
+	{AC3_CHANNEL,  AC3_DOLBY,  AC3_STEREO, AC3_STEREO,
+	 AC3_2F1R,     AC3_2F1R,   AC3_2F1R,   AC3_2F1R},
+	{AC3_CHANNEL,  AC3_DOLBY,  AC3_STEREO, AC3_STEREO,
+	 AC3_2F1R,     AC3_3F1R,   AC3_2F1R,   AC3_3F1R},
+	{AC3_CHANNEL,  AC3_DOLBY,  AC3_STEREO, AC3_3F,
+	 AC3_2F2R,     AC3_2F2R,   AC3_2F2R,   AC3_2F2R},
+	{AC3_CHANNEL,  AC3_DOLBY,  AC3_STEREO, AC3_3F,
+	 AC3_2F2R,     AC3_3F2R,   AC3_2F2R,   AC3_3F2R},
+	{AC3_CHANNEL1, AC3_MONO,   AC3_MONO,   AC3_MONO,
+	 AC3_MONO,     AC3_MONO,   AC3_MONO,   AC3_MONO},
+	{AC3_CHANNEL2, AC3_MONO,   AC3_MONO,   AC3_MONO,
+	 AC3_MONO,     AC3_MONO,   AC3_MONO,   AC3_MONO},
+	{AC3_CHANNEL,  AC3_DOLBY,  AC3_STEREO, AC3_DOLBY,
+	 AC3_DOLBY,    AC3_DOLBY,  AC3_DOLBY,  AC3_DOLBY}
+    };
+    int output;
+
+    output = flags & AC3_CHANNEL_MASK;
+    if (output > AC3_DOLBY)
+	return -1;
+
+    output = table[output][input & 7];
+
+    if ((output == AC3_STEREO) &&
+	((input == AC3_DOLBY) || ((input == AC3_3F) && (clev == LEVEL_3DB))))
+	output = AC3_DOLBY;
+
+    if (flags & AC3_ADJUST_LEVEL)
+	switch (CONVERT (input & 7, output)) {
+
+	case CONVERT (AC3_3F, AC3_MONO):
+	    *level *= LEVEL_3DB / (1 + clev);
+	    break;
+
+	case CONVERT (AC3_STEREO, AC3_MONO):
+	case CONVERT (AC3_2F2R, AC3_2F1R):
+	case CONVERT (AC3_3F2R, AC3_3F1R):
+	level_3db:
+	    *level *= LEVEL_3DB;
+	    break;
+
+	case CONVERT (AC3_3F2R, AC3_2F1R):
+	    if (clev < LEVEL_PLUS3DB - 1)
+		goto level_3db;
+	    // break thru
+	case CONVERT (AC3_3F, AC3_STEREO):
+	case CONVERT (AC3_3F1R, AC3_2F1R):
+	case CONVERT (AC3_3F1R, AC3_2F2R):
+	case CONVERT (AC3_3F2R, AC3_2F2R):
+	    *level /= 1 + clev;
+	    break;
+
+	case CONVERT (AC3_2F1R, AC3_MONO):
+	    *level *= LEVEL_PLUS3DB / (2 + slev);
+	    break;
+
+	case CONVERT (AC3_2F1R, AC3_STEREO):
+	case CONVERT (AC3_3F1R, AC3_3F):
+	    *level /= 1 + slev * LEVEL_3DB;
+	    break;
+
+	case CONVERT (AC3_3F1R, AC3_MONO):
+	    *level *= LEVEL_3DB / (1 + clev + 0.5 * slev);
+	    break;
+
+	case CONVERT (AC3_3F1R, AC3_STEREO):
+	    *level /= 1 + clev + slev * LEVEL_3DB;
+	    break;
+
+	case CONVERT (AC3_2F2R, AC3_MONO):
+	    *level *= LEVEL_3DB / (1 + slev);
+	    break;
+
+	case CONVERT (AC3_2F2R, AC3_STEREO):
+	case CONVERT (AC3_3F2R, AC3_3F):
+	    *level /= (1 + slev);
+	    break;
+
+	case CONVERT (AC3_3F2R, AC3_MONO):
+	    *level *= LEVEL_3DB / (1 + clev + slev);
+	    break;
+
+	case CONVERT (AC3_3F2R, AC3_STEREO):
+	    *level /= 1 + clev + slev;
+	    break;
+
+	case CONVERT (AC3_MONO, AC3_DOLBY):
+	    *level *= LEVEL_PLUS3DB;
+	    break;
+
+	case CONVERT (AC3_3F, AC3_DOLBY):
+	case CONVERT (AC3_2F1R, AC3_DOLBY):
+	    *level *= 1 / (1 + LEVEL_3DB);
+	    break;
+
+	case CONVERT (AC3_3F1R, AC3_DOLBY):
+	case CONVERT (AC3_2F2R, AC3_DOLBY):
+	    *level *= 1 / (1 + 2 * LEVEL_3DB);
+	    break;
+
+	case CONVERT (AC3_3F2R, AC3_DOLBY):
+	    *level *= 1 / (1 + 3 * LEVEL_3DB);
+	    break;
+    }
+
+    return output;
+}
+
+static void mix1to1 (float * samples, float level, float bias)
+{
+    int i;
+
+    for (i = 0; i < 256; i++)
+	samples[i] = samples[i] * level + bias;
+}
+
+static void move1to1 (float * src, float * dest, float level, float bias)
+{
+    int i;
+
+    for (i = 0; i < 256; i++)
+	dest[i] = src[i] * level + bias;
+}
+
+static void mix2to1 (float * samples, float level, float bias)
+{
+    int i;
+
+    for (i = 0; i < 256; i++)
+	samples[i] = (samples[i] + samples[i + 256]) * level + bias;
+}
+
+static void move2to1 (float * src, float * dest, float level, float bias)
+{
+    int i;
+
+    for (i = 0; i < 256; i++)
+	dest[i] = (src[i] + src[i + 256]) * level + bias;
+}
+
+static void mix3to1 (float * samples, float level, float clev, float bias)
+{
+    int i;
+
+    for (i = 0; i < 256; i++)
+	samples[i] = ((samples[i] + samples[i + 512]) * level +
+		      samples[i + 256] * clev + bias);
+}
+
+static void mix21to1 (float * samples, float level, float slev, float bias)
+{
+    int i;
+
+    for (i = 0; i < 256; i++)
+	samples[i] = ((samples[i] + samples[i + 256]) * level +
+		      samples[i + 512] * slev + bias);
+}
+
+static void mix31to1 (float * samples, float level, float clev, float slev,
+		      float bias)
+{
+    int i;
+
+    for (i = 0; i < 256; i++)
+	samples[i] = ((samples[i] + samples[i + 512]) * level +
+		      samples[i + 256] * clev + samples[i + 768] * slev +
+		      bias);
+}
+
+static void mix22to1 (float * samples, float level, float slev, float bias)
+{
+    int i;
+
+    for (i = 0; i < 256; i++)
+	samples[i] = ((samples[i] + samples[i + 256]) * level +
+		      (samples[i + 512] + samples[i + 768]) * slev + bias);
+}
+
+static void mix32to1 (float * samples, float level, float clev, float slev,
+		      float bias)
+{
+    int i;
+
+    for (i = 0; i < 256; i++)
+	samples[i] = ((samples[i] + samples[i + 512]) * level +
+		      samples[i + 256] * clev +
+		      (samples[i + 768] + samples[i + 1024]) * slev + bias);
+}
+
+static void mix1to2 (float * src, float * dest, float level, float bias)
+{
+    int i;
+
+    for (i = 0; i < 256; i++)
+	dest[i] = src[i] = src[i] * level + bias;
+}
+
+static void mix3to2 (float * samples, float level, float clev, float bias)
+{
+    int i;
+    float common;
+
+    for (i = 0; i < 256; i++) {
+	common = samples[i + 256] * clev + bias;
+	samples[i] = samples[i] * level + common;
+	samples[i + 256] = samples[i + 512] * level + common;
+    }
+}
+
+static void mix21to2 (float * left, float * right, float level, float slev,
+		      float bias)
+{
+    int i;
+    float common;
+
+    for (i = 0; i < 256; i++) {
+	common = right[i + 256] * slev + bias;
+	left[i] = left[i] * level + common;
+	right[i] = right[i] * level + common;
+    }
+}
+
+static void mix11to1 (float * front, float * rear, float level, float slev,
+		      float bias)
+{
+    int i;
+
+    for (i = 0; i < 256; i++)
+	front[i] = front[i] * level + rear[i] * slev + bias;
+}
+
+static void mix31to2 (float * samples, float level, float clev, float slev,
+		      float bias)
+{
+    int i;
+    float common;
+
+    for (i = 0; i < 256; i++) {
+	common = samples[i + 256] * clev + samples[i + 768] * slev + bias;
+	samples[i] = samples[i] * level + common;
+	samples[i + 256] = samples[i + 512] * level + common;
+    }
+}
+
+static void mix32to2 (float * samples, float level, float clev, float slev,
+		      float bias)
+{
+    int i;
+    float common;
+
+    for (i = 0; i < 256; i++) {
+	common = samples[i + 256] * clev + bias;
+	samples[i] = samples[i] * level + common + samples[i + 768] * slev;
+	samples[i + 256] = (samples[i + 512] * level + common +
+			    samples[i + 1024] * slev);
+    }
+}
+
+static void mix21toS (float * samples, float level, float level3db, float bias)
+{
+    int i;
+    float surround;
+
+    for (i = 0; i < 256; i++) {
+	surround = samples[i + 512] * level3db;
+	samples[i] = samples[i] * level - surround + bias;
+	samples[i + 256] = samples[i + 256] * level + surround + bias;
+    }
+}
+
+static void mix22toS (float * samples, float level, float level3db, float bias)
+{
+    int i;
+    float surround;
+
+    for (i = 0; i < 256; i++) {
+	surround = (samples[i + 512] + samples[i + 768]) * level3db;
+	samples[i] = samples[i] * level - surround + bias;
+	samples[i + 256] = samples[i + 256] * level + surround + bias;
+    }
+}
+
+static void mix31toS (float * samples, float level, float level3db, float bias)
+{
+    int i;
+    float common, surround;
+
+    for (i = 0; i < 256; i++) {
+	common = samples[i + 256] * level3db + bias;
+	surround = samples[i + 768] * level3db;
+	samples[i] = samples[i] * level + common - surround;
+	samples[i + 256] = samples[i + 512] * level + common + surround;
+    }
+}
+
+static void mix32toS (float * samples, float level, float level3db, float bias)
+{
+    int i;
+    float common, surround;
+
+    for (i = 0; i < 256; i++) {
+	common = samples[i + 256] * level3db + bias;
+	surround = (samples[i + 768] + samples[i + 1024]) * level3db;
+	samples[i] = samples[i] * level + common - surround;
+	samples[i + 256] = samples[i + 512] * level + common + surround;
+    }
+}
+
+void downmix (float * samples, int acmod, int output, float level, float bias,
+	      float clev, float slev)
+{
+    switch (CONVERT (acmod, output & AC3_CHANNEL_MASK)) {
+
+    case CONVERT (AC3_3F2R, AC3_3F2R):
+	mix1to1 (samples + 1024, level, bias);
+    case CONVERT (AC3_3F1R, AC3_3F1R):
+    case CONVERT (AC3_2F2R, AC3_2F2R):
+	mix1to1 (samples + 768, level, bias);
+    case CONVERT (AC3_3F, AC3_3F):
+    case CONVERT (AC3_2F1R, AC3_2F1R):
+    mix_3to3:
+	mix1to1 (samples + 512, level, bias);
+    case CONVERT (AC3_CHANNEL, AC3_CHANNEL):
+    case CONVERT (AC3_STEREO, AC3_STEREO):
+    case CONVERT (AC3_STEREO, AC3_DOLBY):
+    mix_2to2:
+	mix1to1 (samples + 256, level, bias);
+    case CONVERT (AC3_CHANNEL, AC3_CHANNEL1):
+    case CONVERT (AC3_MONO, AC3_MONO):
+	mix1to1 (samples, level, bias);
+	break;
+
+    case CONVERT (AC3_CHANNEL, AC3_CHANNEL2):
+    mix_1to1_b:
+	mix1to1 (samples + 256, level, bias);
+	break;
+
+    case CONVERT (AC3_STEREO, AC3_MONO):
+    mix_2to1:
+	mix2to1 (samples, level * LEVEL_3DB, bias);
+	break;
+
+    case CONVERT (AC3_2F1R, AC3_MONO):
+	if (slev == 0)
+	    goto mix_2to1;
+	mix21to1 (samples, level * LEVEL_3DB, level * slev * LEVEL_3DB, bias);
+	break;
+
+    case CONVERT (AC3_2F2R, AC3_MONO):
+	if (slev == 0)
+	    goto mix_2to1;
+	mix22to1 (samples, level * LEVEL_3DB, level * slev * LEVEL_3DB, bias);
+	break;
+
+    case CONVERT (AC3_3F, AC3_MONO):
+    mix_3to1:
+	mix3to1 (samples, level * LEVEL_3DB, level * clev * LEVEL_PLUS3DB,
+		 bias);
+	break;
+
+    case CONVERT (AC3_3F1R, AC3_MONO):
+	if (slev == 0)
+	    goto mix_3to1;
+	mix31to1 (samples, level * LEVEL_3DB, level * clev * LEVEL_PLUS3DB,
+		  level * slev * LEVEL_3DB, bias);
+	break;
+
+    case CONVERT (AC3_3F2R, AC3_MONO):
+	if (slev == 0)
+	    goto mix_3to1;
+	mix32to1 (samples, level * LEVEL_3DB, level * clev * LEVEL_PLUS3DB,
+		  level * slev * LEVEL_3DB, bias);
+	break;
+
+    case CONVERT (AC3_CHANNEL, AC3_MONO):
+	mix2to1 (samples, level * LEVEL_6DB, bias);
+	break;
+
+    case CONVERT (AC3_MONO, AC3_DOLBY):
+	mix1to2 (samples, samples + 256, level * LEVEL_3DB, bias);
+	break;
+
+    case CONVERT (AC3_3F, AC3_DOLBY):
+	clev = LEVEL_3DB;
+    case CONVERT (AC3_3F, AC3_STEREO):
+    mix_3to2:
+	mix3to2 (samples, level, level * clev, bias);
+	break;
+
+    case CONVERT (AC3_2F1R, AC3_DOLBY):
+	mix21toS (samples, level, level * LEVEL_3DB, bias);
+	break;
+
+    case CONVERT (AC3_3F1R, AC3_DOLBY):
+	mix31toS (samples, level, level * LEVEL_3DB, bias);
+	break;
+
+    case CONVERT (AC3_2F2R, AC3_DOLBY):
+	mix22toS (samples, level, level * LEVEL_3DB, bias);
+	break;
+
+    case CONVERT (AC3_3F2R, AC3_DOLBY):
+	mix32toS (samples, level, level * LEVEL_3DB, bias);
+	break;
+
+    case CONVERT (AC3_2F1R, AC3_STEREO):
+	if (slev == 0)
+	    goto mix_2to2;
+	mix21to2 (samples, samples + 256, level, level * slev * LEVEL_3DB,
+		  bias);
+	break;
+
+    case CONVERT (AC3_3F1R, AC3_STEREO):
+	if (slev == 0)
+	    goto mix_3to2;
+	mix31to2 (samples, level, level * clev, level * slev * LEVEL_3DB,
+		  bias);
+	break;
+
+    case CONVERT (AC3_2F2R, AC3_STEREO):
+	if (slev == 0)
+	    goto mix_2to2;
+	mix11to1 (samples, samples + 512, level, level * slev, bias);
+	mix11to1 (samples + 256, samples + 768, level, level * slev, bias);
+	break;
+
+    case CONVERT (AC3_3F2R, AC3_STEREO):
+	if (slev == 0)
+	    goto mix_3to2;
+	mix32to2 (samples, level, level * clev, level * slev, bias);
+	break;
+
+    case CONVERT (AC3_3F1R, AC3_3F):
+	if (slev == 0)
+	    goto mix_3to3;
+	mix21to2 (samples, samples + 512, level, level * slev * LEVEL_3DB,
+		  bias);
+
+    case CONVERT (AC3_3F2R, AC3_3F):
+	if (slev == 0)
+	    goto mix_3to3;
+	mix11to1 (samples, samples + 768, level, level * slev, bias);
+	mix11to1 (samples + 512, samples + 1024, level, level * slev, bias);
+	goto mix_1to1_b;
+
+    case CONVERT (AC3_2F1R, AC3_2F2R):
+	mix1to2 (samples + 512, samples + 768, level * LEVEL_3DB, bias);
+	goto mix_2to2;
+
+    case CONVERT (AC3_3F1R, AC3_3F2R):
+	mix1to2 (samples + 768, samples + 1024, level * LEVEL_3DB, bias);
+	goto mix_3to3;
+
+    case CONVERT (AC3_2F2R, AC3_2F1R):
+	mix2to1 (samples + 512, level * LEVEL_3DB, bias);
+	goto mix_2to2;
+
+    case CONVERT (AC3_3F2R, AC3_3F1R):
+	mix2to1 (samples + 768, level * LEVEL_3DB, bias);
+	goto mix_3to3;
+
+    case CONVERT (AC3_3F1R, AC3_2F2R):
+	mix3to2 (samples, level, level * clev, bias);
+	mix1to2 (samples + 768, samples + 512, level * LEVEL_3DB, bias);
+	break;
+
+    case CONVERT (AC3_3F1R, AC3_2F1R):
+	mix3to2 (samples, level, level * clev, bias);
+	move1to1 (samples + 768, samples + 512, level, bias);
+	break;
+
+    case CONVERT (AC3_3F2R, AC3_2F1R):
+	mix3to2 (samples, level, level * clev, bias);
+	move2to1 (samples + 768, samples + 512, level * LEVEL_3DB, bias);
+	break;
+
+    case CONVERT (AC3_3F2R, AC3_2F2R):
+	mix3to2 (samples, level, level * clev, bias);
+	move1to1 (samples + 768, samples + 512, level, bias);
+	move1to1 (samples + 1024, samples + 768, level, bias);
+	break;
+
+    }
+}
diff --git a/libavcodec/libac3/imdct.c b/libavcodec/libac3/imdct.c
new file mode 100644
index 0000000000..7be33897f5
--- /dev/null
+++ b/libavcodec/libac3/imdct.c
@@ -0,0 +1,408 @@
+/* 
+ *  imdct.c
+ *
+ *	Copyright (C) Aaron Holtzman - May 1999
+ *
+ *  This file is part of ac3dec, a free Dolby AC-3 stream decoder.
+ *	
+ *  ac3dec 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, or (at your option)
+ *  any later version.
+ *   
+ *  ac3dec 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 GNU Make; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 
+ *
+ *
+ */
+
+//#include "config.h"
+
+#include <inttypes.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+#include "ac3.h"
+#include "ac3_internal.h"
+
+void (* imdct_256) (float data[], float delay[]);
+void (* imdct_512) (float data[], float delay[]);
+
+typedef struct complex_s
+{
+    float real;
+    float imag;
+} complex_t;
+
+
+/* 128 point bit-reverse LUT */
+static uint8_t bit_reverse_512[] = {
+	0x00, 0x40, 0x20, 0x60, 0x10, 0x50, 0x30, 0x70, 
+	0x08, 0x48, 0x28, 0x68, 0x18, 0x58, 0x38, 0x78, 
+	0x04, 0x44, 0x24, 0x64, 0x14, 0x54, 0x34, 0x74, 
+	0x0c, 0x4c, 0x2c, 0x6c, 0x1c, 0x5c, 0x3c, 0x7c, 
+	0x02, 0x42, 0x22, 0x62, 0x12, 0x52, 0x32, 0x72, 
+	0x0a, 0x4a, 0x2a, 0x6a, 0x1a, 0x5a, 0x3a, 0x7a, 
+	0x06, 0x46, 0x26, 0x66, 0x16, 0x56, 0x36, 0x76, 
+	0x0e, 0x4e, 0x2e, 0x6e, 0x1e, 0x5e, 0x3e, 0x7e, 
+	0x01, 0x41, 0x21, 0x61, 0x11, 0x51, 0x31, 0x71, 
+	0x09, 0x49, 0x29, 0x69, 0x19, 0x59, 0x39, 0x79, 
+	0x05, 0x45, 0x25, 0x65, 0x15, 0x55, 0x35, 0x75, 
+	0x0d, 0x4d, 0x2d, 0x6d, 0x1d, 0x5d, 0x3d, 0x7d, 
+	0x03, 0x43, 0x23, 0x63, 0x13, 0x53, 0x33, 0x73, 
+	0x0b, 0x4b, 0x2b, 0x6b, 0x1b, 0x5b, 0x3b, 0x7b, 
+	0x07, 0x47, 0x27, 0x67, 0x17, 0x57, 0x37, 0x77, 
+	0x0f, 0x4f, 0x2f, 0x6f, 0x1f, 0x5f, 0x3f, 0x7f};
+
+static uint8_t bit_reverse_256[] = {
+	0x00, 0x20, 0x10, 0x30, 0x08, 0x28, 0x18, 0x38, 
+	0x04, 0x24, 0x14, 0x34, 0x0c, 0x2c, 0x1c, 0x3c, 
+	0x02, 0x22, 0x12, 0x32, 0x0a, 0x2a, 0x1a, 0x3a, 
+	0x06, 0x26, 0x16, 0x36, 0x0e, 0x2e, 0x1e, 0x3e, 
+	0x01, 0x21, 0x11, 0x31, 0x09, 0x29, 0x19, 0x39, 
+	0x05, 0x25, 0x15, 0x35, 0x0d, 0x2d, 0x1d, 0x3d, 
+	0x03, 0x23, 0x13, 0x33, 0x0b, 0x2b, 0x1b, 0x3b, 
+	0x07, 0x27, 0x17, 0x37, 0x0f, 0x2f, 0x1f, 0x3f};
+
+static complex_t buf[128];
+
+/* Twiddle factor LUT */
+static complex_t w_1[1];
+static complex_t w_2[2];
+static complex_t w_4[4];
+static complex_t w_8[8];
+static complex_t w_16[16];
+static complex_t w_32[32];
+static complex_t w_64[64];
+static complex_t * w[7] = {w_1, w_2, w_4, w_8, w_16, w_32, w_64};
+
+/* Twiddle factors for IMDCT */
+static float xcos1[128];
+static float xsin1[128];
+static float xcos2[64];
+static float xsin2[64];
+
+/* Windowing function for Modified DCT - Thank you acroread */
+float imdct_window[] = {
+	0.00014, 0.00024, 0.00037, 0.00051, 0.00067, 0.00086, 0.00107, 0.00130,
+	0.00157, 0.00187, 0.00220, 0.00256, 0.00297, 0.00341, 0.00390, 0.00443,
+	0.00501, 0.00564, 0.00632, 0.00706, 0.00785, 0.00871, 0.00962, 0.01061,
+	0.01166, 0.01279, 0.01399, 0.01526, 0.01662, 0.01806, 0.01959, 0.02121,
+	0.02292, 0.02472, 0.02662, 0.02863, 0.03073, 0.03294, 0.03527, 0.03770,
+	0.04025, 0.04292, 0.04571, 0.04862, 0.05165, 0.05481, 0.05810, 0.06153,
+	0.06508, 0.06878, 0.07261, 0.07658, 0.08069, 0.08495, 0.08935, 0.09389,
+	0.09859, 0.10343, 0.10842, 0.11356, 0.11885, 0.12429, 0.12988, 0.13563,
+	0.14152, 0.14757, 0.15376, 0.16011, 0.16661, 0.17325, 0.18005, 0.18699,
+	0.19407, 0.20130, 0.20867, 0.21618, 0.22382, 0.23161, 0.23952, 0.24757,
+	0.25574, 0.26404, 0.27246, 0.28100, 0.28965, 0.29841, 0.30729, 0.31626,
+	0.32533, 0.33450, 0.34376, 0.35311, 0.36253, 0.37204, 0.38161, 0.39126,
+	0.40096, 0.41072, 0.42054, 0.43040, 0.44030, 0.45023, 0.46020, 0.47019,
+	0.48020, 0.49022, 0.50025, 0.51028, 0.52031, 0.53033, 0.54033, 0.55031,
+	0.56026, 0.57019, 0.58007, 0.58991, 0.59970, 0.60944, 0.61912, 0.62873,
+	0.63827, 0.64774, 0.65713, 0.66643, 0.67564, 0.68476, 0.69377, 0.70269,
+	0.71150, 0.72019, 0.72877, 0.73723, 0.74557, 0.75378, 0.76186, 0.76981,
+	0.77762, 0.78530, 0.79283, 0.80022, 0.80747, 0.81457, 0.82151, 0.82831,
+	0.83496, 0.84145, 0.84779, 0.85398, 0.86001, 0.86588, 0.87160, 0.87716,
+	0.88257, 0.88782, 0.89291, 0.89785, 0.90264, 0.90728, 0.91176, 0.91610,
+	0.92028, 0.92432, 0.92822, 0.93197, 0.93558, 0.93906, 0.94240, 0.94560,
+	0.94867, 0.95162, 0.95444, 0.95713, 0.95971, 0.96217, 0.96451, 0.96674,
+	0.96887, 0.97089, 0.97281, 0.97463, 0.97635, 0.97799, 0.97953, 0.98099,
+	0.98236, 0.98366, 0.98488, 0.98602, 0.98710, 0.98811, 0.98905, 0.98994,
+	0.99076, 0.99153, 0.99225, 0.99291, 0.99353, 0.99411, 0.99464, 0.99513,
+	0.99558, 0.99600, 0.99639, 0.99674, 0.99706, 0.99736, 0.99763, 0.99788,
+	0.99811, 0.99831, 0.99850, 0.99867, 0.99882, 0.99895, 0.99908, 0.99919,
+	0.99929, 0.99938, 0.99946, 0.99953, 0.99959, 0.99965, 0.99969, 0.99974,
+	0.99978, 0.99981, 0.99984, 0.99986, 0.99988, 0.99990, 0.99992, 0.99993,
+	0.99994, 0.99995, 0.99996, 0.99997, 0.99998, 0.99998, 0.99998, 0.99999,
+	0.99999, 0.99999, 0.99999, 1.00000, 1.00000, 1.00000, 1.00000, 1.00000,
+	1.00000, 1.00000, 1.00000, 1.00000, 1.00000, 1.00000, 1.00000, 1.00000 };
+
+
+static inline void swap_cmplx(complex_t *a, complex_t *b)
+{
+    complex_t tmp;
+
+    tmp = *a;
+    *a = *b;
+    *b = tmp;
+}
+
+
+
+static inline complex_t cmplx_mult(complex_t a, complex_t b)
+{
+    complex_t ret;
+
+    ret.real = a.real * b.real - a.imag * b.imag;
+    ret.imag = a.real * b.imag + a.imag * b.real;
+
+    return ret;
+}
+
+void
+imdct_do_512(float data[],float delay[])
+{
+    int i,k;
+    int p,q;
+    int m;
+    int two_m;
+    int two_m_plus_one;
+
+    float tmp_a_i;
+    float tmp_a_r;
+    float tmp_b_i;
+    float tmp_b_r;
+
+    float *data_ptr;
+    float *delay_ptr;
+    float *window_ptr;
+	
+    //
+    // 512 IMDCT with source and dest data in 'data'
+    //
+	
+    // Pre IFFT complex multiply plus IFFT cmplx conjugate 
+    for( i=0; i < 128; i++) {
+	/* z[i] = (X[256-2*i-1] + j * X[2*i]) * (xcos1[i] + j * xsin1[i]) ; */ 
+	buf[i].real =         (data[256-2*i-1] * xcos1[i])  -  (data[2*i]       * xsin1[i]);
+	buf[i].imag = -1.0 * ((data[2*i]       * xcos1[i])  +  (data[256-2*i-1] * xsin1[i]));
+    }
+
+    //Bit reversed shuffling
+    for(i=0; i<128; i++) {
+	k = bit_reverse_512[i];
+	if (k < i)
+	    swap_cmplx(&buf[i],&buf[k]);
+    }
+
+    /* FFT Merge */
+    for (m=0; m < 7; m++) {
+	if(m)
+	    two_m = (1 << m);
+	else
+	    two_m = 1;
+
+	two_m_plus_one = (1 << (m+1));
+
+	for(k = 0; k < two_m; k++) {
+	    for(i = 0; i < 128; i += two_m_plus_one) {
+		p = k + i;
+		q = p + two_m;
+		tmp_a_r = buf[p].real;
+		tmp_a_i = buf[p].imag;
+		tmp_b_r = buf[q].real * w[m][k].real - buf[q].imag * w[m][k].imag;
+		tmp_b_i = buf[q].imag * w[m][k].real + buf[q].real * w[m][k].imag;
+		buf[p].real = tmp_a_r + tmp_b_r;
+		buf[p].imag =  tmp_a_i + tmp_b_i;
+		buf[q].real = tmp_a_r - tmp_b_r;
+		buf[q].imag =  tmp_a_i - tmp_b_i;
+	    }
+	}
+    }
+
+    /* Post IFFT complex multiply  plus IFFT complex conjugate*/
+    for( i=0; i < 128; i++) {
+	/* y[n] = z[n] * (xcos1[n] + j * xsin1[n]) ; */
+	tmp_a_r =        buf[i].real;
+	tmp_a_i = -1.0 * buf[i].imag;
+	buf[i].real =(tmp_a_r * xcos1[i])  -  (tmp_a_i  * xsin1[i]);
+	buf[i].imag =(tmp_a_r * xsin1[i])  +  (tmp_a_i  * xcos1[i]);
+    }
+	
+    data_ptr = data;
+    delay_ptr = delay;
+    window_ptr = imdct_window;
+
+    /* Window and convert to real valued signal */
+    for(i=0; i< 64; i++) { 
+	*data_ptr++   = 2.0f * (-buf[64+i].imag   * *window_ptr++ + *delay_ptr++); 
+	*data_ptr++   = 2.0f * ( buf[64-i-1].real * *window_ptr++ + *delay_ptr++); 
+    }
+
+    for(i=0; i< 64; i++) { 
+	*data_ptr++  = 2.0f * (-buf[i].real       * *window_ptr++ + *delay_ptr++); 
+	*data_ptr++  = 2.0f * ( buf[128-i-1].imag * *window_ptr++ + *delay_ptr++); 
+    }
+
+    /* The trailing edge of the window goes into the delay line */
+    delay_ptr = delay;
+
+    for(i=0; i< 64; i++) { 
+	*delay_ptr++  = -buf[64+i].real   * *--window_ptr; 
+	*delay_ptr++  =  buf[64-i-1].imag * *--window_ptr; 
+    }
+
+    for(i=0; i<64; i++) {
+	*delay_ptr++  =  buf[i].imag       * *--window_ptr; 
+	*delay_ptr++  = -buf[128-i-1].real * *--window_ptr; 
+    }
+}
+
+void
+imdct_do_256(float data[],float delay[])
+{
+    int i,k;
+    int p,q;
+    int m;
+    int two_m;
+    int two_m_plus_one;
+
+    float tmp_a_i;
+    float tmp_a_r;
+    float tmp_b_i;
+    float tmp_b_r;
+
+    float *data_ptr;
+    float *delay_ptr;
+    float *window_ptr;
+
+    complex_t *buf_1, *buf_2;
+
+    buf_1 = &buf[0];
+    buf_2 = &buf[64];
+
+    /* Pre IFFT complex multiply plus IFFT cmplx conjugate */
+    for(k=0; k<64; k++) { 
+	/* X1[k] = X[2*k]  */
+	/* X2[k] = X[2*k+1]     */
+
+	p = 2 * (128-2*k-1);
+	q = 2 * (2 * k);
+
+	/* Z1[k] = (X1[128-2*k-1] + j * X1[2*k]) * (xcos2[k] + j * xsin2[k]); */ 
+	buf_1[k].real =         data[p] * xcos2[k] - data[q] * xsin2[k];
+	buf_1[k].imag = -1.0f * (data[q] * xcos2[k] + data[p] * xsin2[k]); 
+	/* Z2[k] = (X2[128-2*k-1] + j * X2[2*k]) * (xcos2[k] + j * xsin2[k]); */ 
+	buf_2[k].real =          data[p + 1] * xcos2[k] - data[q + 1] * xsin2[k];
+	buf_2[k].imag = -1.0f * ( data[q + 1] * xcos2[k] + data[p + 1] * xsin2[k]); 
+    }
+
+    //IFFT Bit reversed shuffling
+    for(i=0; i<64; i++) { 
+	k = bit_reverse_256[i];
+	if (k < i) {
+	    swap_cmplx(&buf_1[i],&buf_1[k]);
+	    swap_cmplx(&buf_2[i],&buf_2[k]);
+	}
+    }
+
+    /* FFT Merge */
+    for (m=0; m < 6; m++) {
+	two_m = (1 << m);
+	two_m_plus_one = (1 << (m+1));
+
+	//FIXME
+	if(m)
+	    two_m = (1 << m);
+	else
+	    two_m = 1;
+
+	for(k = 0; k < two_m; k++) {
+	    for(i = 0; i < 64; i += two_m_plus_one) {
+		p = k + i;
+		q = p + two_m;
+		//Do block 1
+		tmp_a_r = buf_1[p].real;
+		tmp_a_i = buf_1[p].imag;
+		tmp_b_r = buf_1[q].real * w[m][k].real - buf_1[q].imag * w[m][k].imag;
+		tmp_b_i = buf_1[q].imag * w[m][k].real + buf_1[q].real * w[m][k].imag;
+		buf_1[p].real = tmp_a_r + tmp_b_r;
+		buf_1[p].imag =  tmp_a_i + tmp_b_i;
+		buf_1[q].real = tmp_a_r - tmp_b_r;
+		buf_1[q].imag =  tmp_a_i - tmp_b_i;
+
+		//Do block 2
+		tmp_a_r = buf_2[p].real;
+		tmp_a_i = buf_2[p].imag;
+		tmp_b_r = buf_2[q].real * w[m][k].real - buf_2[q].imag * w[m][k].imag;
+		tmp_b_i = buf_2[q].imag * w[m][k].real + buf_2[q].real * w[m][k].imag;
+		buf_2[p].real = tmp_a_r + tmp_b_r;
+		buf_2[p].imag =  tmp_a_i + tmp_b_i;
+		buf_2[q].real = tmp_a_r - tmp_b_r;
+		buf_2[q].imag =  tmp_a_i - tmp_b_i;
+	    }
+	}
+    }
+
+    /* Post IFFT complex multiply */
+    for( i=0; i < 64; i++) {
+	/* y1[n] = z1[n] * (xcos2[n] + j * xs in2[n]) ; */ 
+	tmp_a_r =  buf_1[i].real;
+	tmp_a_i = -buf_1[i].imag;
+	buf_1[i].real =(tmp_a_r * xcos2[i])  -  (tmp_a_i  * xsin2[i]);
+	buf_1[i].imag =(tmp_a_r * xsin2[i])  +  (tmp_a_i  * xcos2[i]);
+	/* y2[n] = z2[n] * (xcos2[n] + j * xsin2[n]) ; */ 
+	tmp_a_r =  buf_2[i].real;
+	tmp_a_i = -buf_2[i].imag;
+	buf_2[i].real =(tmp_a_r * xcos2[i])  -  (tmp_a_i  * xsin2[i]);
+	buf_2[i].imag =(tmp_a_r * xsin2[i])  +  (tmp_a_i  * xcos2[i]);
+    }
+	
+    data_ptr = data;
+    delay_ptr = delay;
+    window_ptr = imdct_window;
+
+    /* Window and convert to real valued signal */
+    for(i=0; i< 64; i++) { 
+	*data_ptr++  = 2.0f * (-buf_1[i].imag      * *window_ptr++ + *delay_ptr++);
+	*data_ptr++  = 2.0f * ( buf_1[64-i-1].real * *window_ptr++ + *delay_ptr++);
+    }
+
+    for(i=0; i< 64; i++) {
+	*data_ptr++  = 2.0f * (-buf_1[i].real      * *window_ptr++ + *delay_ptr++);
+	*data_ptr++  = 2.0f * ( buf_1[64-i-1].imag * *window_ptr++ + *delay_ptr++);
+    }
+	
+    delay_ptr = delay;
+
+    for(i=0; i< 64; i++) {
+	*delay_ptr++ = -buf_2[i].real      * *--window_ptr;
+	*delay_ptr++ =  buf_2[64-i-1].imag * *--window_ptr;
+    }
+
+    for(i=0; i< 64; i++) {
+	*delay_ptr++ =  buf_2[i].imag      * *--window_ptr;
+	*delay_ptr++ = -buf_2[64-i-1].real * *--window_ptr;
+    }
+}
+
+void imdct_init (void)
+{
+#ifdef LIBAC3_MLIB
+    void imdct_do_256_mlib(float data[],float delay[]);
+    void imdct_do_512_mlib(float data[],float delay[]);
+
+    imdct_512 = imdct_do_512_mlib;
+    imdct_256 = imdct_do_256_mlib;
+#else
+    int i, j, k;
+
+    /* Twiddle factors to turn IFFT into IMDCT */
+    for (i = 0; i < 128; i++) {
+	xcos1[i] = -cos ((M_PI / 2048) * (8 * i + 1));
+	xsin1[i] = -sin ((M_PI / 2048) * (8 * i + 1));
+    }
+
+    /* More twiddle factors to turn IFFT into IMDCT */
+    for (i = 0; i < 64; i++) {
+	xcos2[i] = -cos ((M_PI / 1024) * (8 * i + 1));
+	xsin2[i] = -sin ((M_PI / 1024) * (8 * i + 1));
+    }
+
+    for (i = 0; i < 7; i++) {
+	j = 1 << i;
+	for (k = 0; k < j; k++) {
+	    w[i][k].real = cos (-M_PI * k / j);
+	    w[i][k].imag = sin (-M_PI * k / j);
+	}
+    }
+    imdct_512 = imdct_do_512;
+    imdct_256 = imdct_do_256;
+#endif
+}
diff --git a/libavcodec/libac3/parse.c b/libavcodec/libac3/parse.c
new file mode 100644
index 0000000000..c6eae00ba5
--- /dev/null
+++ b/libavcodec/libac3/parse.c
@@ -0,0 +1,684 @@
+/* 
+ *    parse.c
+ *
+ *	Copyright (C) Aaron Holtzman - May 1999
+ *
+ *  This file is part of ac3dec, a free Dolby AC-3 stream decoder.
+ *	
+ *  ac3dec 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, or (at your option)
+ *  any later version.
+ *   
+ *  ac3dec 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 GNU Make; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 
+ *
+ *
+ */
+
+#include <inttypes.h>
+#include <string.h>
+
+#include "ac3.h"
+#include "ac3_internal.h"
+
+#include "bitstream.h"
+#include "tables.h"
+
+extern stream_samples_t samples;	// FIXME
+static float delay[6][256];
+
+void ac3_init (void)
+{
+    imdct_init ();
+}
+
+static uint8_t halfrate[12] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3};
+
+int ac3_syncinfo (uint8_t * buf, int * flags,
+		  int * sample_rate, int * bit_rate)
+{
+    static int rate[] = { 32,  40,  48,  56,  64,  80,  96, 112,
+			 128, 160, 192, 224, 256, 320, 384, 448,
+			 512, 576, 640};
+    static uint8_t lfeon[8] = {0x10, 0x10, 0x04, 0x04, 0x04, 0x01, 0x04, 0x01};
+    int frmsizecod;
+    int bitrate;
+    int half;
+    int acmod;
+
+    if ((buf[0] != 0x0b) || (buf[1] != 0x77))	// syncword
+	return 0;
+
+    if (buf[5] >= 0x60)		// bsid >= 12
+	return 0;
+    half = halfrate[buf[5] >> 3];
+
+    // acmod, dsurmod and lfeon
+    acmod = buf[6] >> 5;
+    *flags = (((buf[6] & 0xf8) == 0x50) ? AC3_DOLBY : acmod) |
+	      ((buf[6] & lfeon[acmod]) ? AC3_LFE : 0);
+
+    frmsizecod = buf[4] & 63;
+    if (frmsizecod >= 38)
+	return 0;
+    bitrate = rate [frmsizecod >> 1];
+    *bit_rate = (bitrate * 1000) >> half;
+
+    switch (buf[4] & 0xc0) {
+    case 0:	// 48 KHz
+	*sample_rate = 48000 >> half;
+	return 4 * bitrate;
+    case 0x40:
+	*sample_rate = 44100 >> half;
+	return 2 * (320 * bitrate / 147 + (frmsizecod & 1));
+    case 0x80:
+	*sample_rate = 32000 >> half;
+	return 6 * bitrate;
+    default:
+	return 0;
+    }
+}
+
+int ac3_frame (ac3_state_t * state, uint8_t * buf, int * flags, float * level,
+	       float bias)
+{
+    static float clev[4] = {LEVEL_3DB, LEVEL_45DB, LEVEL_6DB, LEVEL_45DB};
+    static float slev[4] = {LEVEL_3DB, LEVEL_6DB, 0, LEVEL_6DB};
+    int chaninfo;
+    int acmod;
+
+    state->fscod = buf[4] >> 6;
+    state->halfrate = halfrate[buf[5] >> 3];
+    state->acmod = acmod = buf[6] >> 5;
+
+    bitstream_set_ptr (buf + 6);
+    bitstream_get (3);	// skip acmod we already parsed
+
+    if ((acmod == 2) && (bitstream_get (2) == 2))	// dsurmod
+	acmod = AC3_DOLBY;
+
+    if ((acmod & 1) && (acmod != 1))
+	state->clev = clev[bitstream_get (2)];	// cmixlev
+
+    if (acmod & 4)
+	state->slev = slev[bitstream_get (2)];	// surmixlev
+
+    state->lfeon = bitstream_get (1);
+
+    state->output = downmix_init (acmod, *flags, level,
+				  state->clev, state->slev);
+    if (state->output < 0)
+	return 1;
+    *flags = state->output;
+    state->level = *level;
+    state->bias = bias;
+
+    chaninfo = !acmod;
+    do {
+	bitstream_get (5);	// dialnorm
+	if (bitstream_get (1))	// compre
+	    bitstream_get (8);	// compr
+	if (bitstream_get (1))	// langcode
+	    bitstream_get (8);	// langcod
+	if (bitstream_get (1))	// audprodie
+	    bitstream_get (7);	// mixlevel + roomtyp
+    } while (chaninfo--);
+
+    bitstream_get (2);		// copyrightb + origbs
+
+    if (bitstream_get (1))	// timecod1e
+	bitstream_get (14);	// timecod1
+    if (bitstream_get (1))	// timecod2e
+	bitstream_get (14);	// timecod2
+
+    if (bitstream_get (1)) {	// addbsie
+	int addbsil;
+
+	addbsil = bitstream_get (6);
+	do {
+	    bitstream_get (8);	// addbsi
+	} while (addbsil--);
+    }
+
+    return 0;
+}
+
+static int parse_exponents (int expstr, int ngrps, uint8_t exponent,
+			    uint8_t * dest)
+{
+    int exps;
+
+    while (ngrps--) {
+	exps = bitstream_get (7);
+
+	exponent += exp_1[exps];
+	if (exponent > 24)
+	    return 1;
+
+	switch (expstr) {
+	case EXP_D45:
+	    *(dest++) = exponent;
+	    *(dest++) = exponent;
+	case EXP_D25:
+	    *(dest++) = exponent;
+	case EXP_D15:
+	    *(dest++) = exponent;
+	}
+
+	exponent += exp_2[exps];
+	if (exponent > 24)
+	    return 1;
+
+	switch (expstr) {
+	case EXP_D45:
+	    *(dest++) = exponent;
+	    *(dest++) = exponent;
+	case EXP_D25:
+	    *(dest++) = exponent;
+	case EXP_D15:
+	    *(dest++) = exponent;
+	}
+
+	exponent += exp_3[exps];
+	if (exponent > 24)
+	    return 1;
+
+	switch (expstr) {
+	case EXP_D45:
+	    *(dest++) = exponent;
+	    *(dest++) = exponent;
+	case EXP_D25:
+	    *(dest++) = exponent;
+	case EXP_D15:
+	    *(dest++) = exponent;
+	}
+    }	
+
+    return 0;
+}
+
+static int parse_deltba (int8_t * deltba)
+{
+    int deltnseg, deltlen, delta, j;
+
+    memset (deltba, 0, 50);
+
+    deltnseg = bitstream_get (3);
+    j = 0;
+    do {
+	j += bitstream_get (5);
+	deltlen = bitstream_get (4);
+	delta = bitstream_get (3);
+	delta -= (delta >= 4) ? 3 : 4;
+	if (!deltlen)
+	    continue;
+	if (j + deltlen >= 50)
+	    return 1;
+	while (deltlen--)
+	    deltba[j++] = delta;
+    } while (deltnseg--);
+
+    return 0;
+}
+
+static inline int zero_snr_offsets (int nfchans, ac3_state_t * state)
+{
+    int i;
+
+    if ((state->csnroffst) || (state->cplinu && state->cplba.fsnroffst) ||
+	(state->lfeon && state->lfeba.fsnroffst))
+	return 0;
+    for (i = 0; i < nfchans; i++)
+	if (state->ba[i].fsnroffst)
+	    return 0;
+    return 1;
+}
+
+static float q_1[2];
+static float q_2[2];
+static float q_4;
+static int q_1_pointer;
+static int q_2_pointer;
+static int q_4_pointer;
+
+#define GET_COEFF(COEFF,DITHER)						\
+    switch (bap[i]) {							\
+    case 0:								\
+	DITHER (scale_factor[exp[i]]);					\
+									\
+    case -1:								\
+	if (q_1_pointer >= 0) {						\
+	    COEFF (q_1[q_1_pointer--] * scale_factor[exp[i]]);		\
+	} else {							\
+	    int code;							\
+									\
+	    code = bitstream_get (5);					\
+									\
+	    q_1_pointer = 1;						\
+	    q_1[0] = q_1_2[code];					\
+	    q_1[1] = q_1_1[code];					\
+	    COEFF (q_1_0[code] * scale_factor[exp[i]]);			\
+	}								\
+									\
+    case -2:								\
+	if (q_2_pointer >= 0) {						\
+	    COEFF (q_2[q_2_pointer--] * scale_factor[exp[i]]);		\
+	} else {							\
+	    int code;							\
+									\
+	    code = bitstream_get (7);					\
+									\
+	    q_2_pointer = 1;						\
+	    q_2[0] = q_2_2[code];					\
+	    q_2[1] = q_2_1[code];					\
+	    COEFF (q_2_0[code] * scale_factor[exp[i]]);			\
+	}								\
+									\
+    case 3:								\
+	COEFF (q_3[bitstream_get (3)] * scale_factor[exp[i]]);		\
+									\
+    case -3:								\
+	if (q_4_pointer == 0) {						\
+	    q_4_pointer = -1;						\
+	    COEFF (q_4 * scale_factor[exp[i]]);				\
+	} else {							\
+	    int code;							\
+									\
+	    code = bitstream_get (7);					\
+									\
+	    q_4_pointer = 0;						\
+	    q_4 = q_4_1[code];						\
+	    COEFF (q_4_0[code] * scale_factor[exp[i]]);			\
+	}								\
+									\
+    case 4:								\
+	COEFF (q_5[bitstream_get (4)] * scale_factor[exp[i]]);		\
+									\
+    default:								\
+	COEFF (((int16_t)(bitstream_get(bap[i]) << (16 - bap[i]))) *	\
+	       scale_factor[exp[i]]);					\
+    }
+
+#define CHANNEL_COEFF(val)			\
+    coeff[i++] = val;				\
+    continue;
+
+#define CHANNEL_DITHER(val)			\
+    if (dither) {				\
+	coeff[i++] = dither_gen () * val;	\
+	continue;				\
+    } else {					\
+	coeff[i++] = 0;				\
+	continue;				\
+    }
+
+static uint16_t lfsr_state = 1;
+
+static inline int16_t dither_gen(void)
+{
+    int16_t state;
+
+    state = dither_lut[lfsr_state >> 8] ^ (lfsr_state << 8);
+	
+    lfsr_state = (uint16_t) state;
+
+    return ((state * (int) (LEVEL_3DB * 256)) >> 8);
+}
+
+static void coeff_get (float * coeff, uint8_t * exp, int8_t * bap,
+		       int dither, int end)
+{
+    int i;
+
+    i = 0;
+    while (i < end)
+	GET_COEFF (CHANNEL_COEFF, CHANNEL_DITHER);
+}
+
+#define COUPLING_COEFF(val)	\
+    cplcoeff = val;		\
+    break;
+
+#define COUPLING_DITHER(val)						\
+    cplcoeff = val;							\
+    for (ch = 0; ch < nfchans; ch++)					\
+	if (state->chincpl[ch]) {					\
+	    if (dithflag[ch])						\
+		samples[ch][i] =					\
+		    state->cplco[ch][bnd] * dither_gen () * cplcoeff;	\
+	    else							\
+		samples[ch][i] = 0;					\
+	}								\
+    i++;								\
+    continue;
+
+int ac3_block (ac3_state_t * state)
+{
+    static const uint8_t nfchans_tbl[8] = {2, 1, 2, 3, 3, 4, 4, 5};
+    static int rematrix_band[4] = {25, 37, 61, 253};
+    int i, nfchans, chaninfo;
+    uint8_t cplexpstr, chexpstr[5], lfeexpstr, do_bit_alloc, done_cpl;
+    uint8_t blksw[5], dithflag[5];
+
+    nfchans = nfchans_tbl[state->acmod];
+
+    for (i = 0; i < nfchans; i++)
+	blksw[i] = bitstream_get (1);
+
+    for (i = 0; i < nfchans; i++)
+	dithflag[i] = bitstream_get (1);
+
+    chaninfo = !(state->acmod);
+    do {
+	if (bitstream_get (1))	// dynrnge
+	    bitstream_get (8);	// dynrng
+    } while (chaninfo--);
+
+    if (bitstream_get (1)) {	// cplstre
+	state->cplinu = bitstream_get (1);
+	if (state->cplinu) {
+	    static int bndtab[16] = {31, 35, 37, 39, 41, 42, 43, 44,
+				     45, 45, 46, 46, 47, 47, 48, 48};
+	    int cplbegf;
+	    int cplendf;
+	    int ncplsubnd;
+
+	    for (i = 0; i < nfchans; i++)
+		state->chincpl[i] = bitstream_get (1);
+	    switch (state->acmod) {
+	    case 0: case 1:
+		return 1;
+	    case 2:
+		state->phsflginu = bitstream_get (1);
+	    }
+	    cplbegf = bitstream_get (4);
+	    cplendf = bitstream_get (4);
+
+	    if (cplendf + 3 - cplbegf < 0)
+		return 1;
+	    state->ncplbnd = ncplsubnd = cplendf + 3 - cplbegf;
+	    state->cplstrtbnd = bndtab[cplbegf];
+	    state->cplstrtmant = cplbegf * 12 + 37;
+	    state->cplendmant = cplendf * 12 + 73;
+
+	    for (i = 0; i < ncplsubnd - 1; i++) {
+		state->cplbndstrc[i] = bitstream_get (1);
+		state->ncplbnd -= state->cplbndstrc[i];
+	    }
+	    state->cplbndstrc[i] = 0;	// last value is a sentinel
+	}
+    }
+
+    if (state->cplinu) {
+	int j, cplcoe;
+
+	cplcoe = 0;
+	for (i = 0; i < nfchans; i++)
+	    if (state->chincpl[i])
+		if (bitstream_get (1)) {	// cplcoe
+		    int mstrcplco, cplcoexp, cplcomant;
+
+		    cplcoe = 1;
+		    mstrcplco = 3 * bitstream_get (2);
+		    for (j = 0; j < state->ncplbnd; j++) {
+			cplcoexp = bitstream_get (4);
+			cplcomant = bitstream_get (4);
+			if (cplcoexp == 15)
+			    cplcomant <<= 14;
+			else
+			    cplcomant = (cplcomant | 0x10) << 13;
+			state->cplco[i][j] =
+			    cplcomant * scale_factor[cplcoexp + mstrcplco];
+		    }
+		}
+	if ((state->acmod == 2) && state->phsflginu && cplcoe)
+	    for (j = 0; j < state->ncplbnd; j++)
+		if (bitstream_get (1))	// phsflg
+		    state->cplco[1][j] = -state->cplco[1][j];
+    }
+
+    if ((state->acmod == 2) && (bitstream_get (1))) {	// rematstr
+	int end;
+
+	end = (state->cplinu) ? state->cplstrtmant : 253;
+	i = 0;
+	do
+	    state->rematflg[i] = bitstream_get (1);
+	while (rematrix_band[i++] < end);
+    }
+
+    cplexpstr = EXP_REUSE;
+    lfeexpstr = EXP_REUSE;
+    if (state->cplinu)
+	cplexpstr = bitstream_get (2);
+    for (i = 0; i < nfchans; i++)
+	chexpstr[i] = bitstream_get (2);
+    if (state->lfeon) 
+	lfeexpstr = bitstream_get (1);
+
+    for (i = 0; i < nfchans; i++)
+	if (chexpstr[i] != EXP_REUSE) {
+	    if (state->cplinu && state->chincpl[i])
+		state->endmant[i] = state->cplstrtmant;
+	    else {
+		int chbwcod;
+
+		chbwcod = bitstream_get (6);
+		if (chbwcod > 60)
+		    return 1;
+		state->endmant[i] = chbwcod * 3 + 73;
+	    }
+	}
+
+    do_bit_alloc = 0;
+
+    if (cplexpstr != EXP_REUSE) {
+	int cplabsexp, ncplgrps;
+
+	do_bit_alloc = 1;
+	ncplgrps = ((state->cplendmant - state->cplstrtmant) /
+		    (3 << (cplexpstr - 1)));
+	cplabsexp = bitstream_get (4) << 1;
+	if (parse_exponents (cplexpstr, ncplgrps, cplabsexp,
+			     state->cpl_exp + state->cplstrtmant))
+	    return 1;
+    }
+    for (i = 0; i < nfchans; i++)
+	if (chexpstr[i] != EXP_REUSE) {
+	    int grp_size, nchgrps;
+
+	    do_bit_alloc = 1;
+	    grp_size = 3 << (chexpstr[i] - 1);
+	    nchgrps = (state->endmant[i] + grp_size - 4) / grp_size;
+	    state->fbw_exp[i][0] = bitstream_get (4);
+	    if (parse_exponents (chexpstr[i], nchgrps, state->fbw_exp[i][0],
+				 state->fbw_exp[i] + 1))
+		return 1;
+	    bitstream_get (2);	// gainrng
+	}
+    if (lfeexpstr != EXP_REUSE) {
+	do_bit_alloc = 1;
+	state->lfe_exp[0] = bitstream_get (4);
+	if (parse_exponents (lfeexpstr, 2, state->lfe_exp[0],
+			     state->lfe_exp + 1))
+	    return 1;
+    }
+
+    if (bitstream_get (1)) {	// baie
+	do_bit_alloc = 1;
+	state->sdcycod = bitstream_get (2);
+	state->fdcycod = bitstream_get (2);
+	state->sgaincod = bitstream_get (2);
+	state->dbpbcod = bitstream_get (2);
+	state->floorcod = bitstream_get (3);
+    }
+    if (bitstream_get (1)) {	//snroffste
+	do_bit_alloc = 1;
+	state->csnroffst = bitstream_get (6);
+	if (state->cplinu) {
+	    state->cplba.fsnroffst = bitstream_get (4);
+	    state->cplba.fgaincod = bitstream_get (3);
+	}
+	for (i = 0; i < nfchans; i++) {
+	    state->ba[i].fsnroffst = bitstream_get (4);
+	    state->ba[i].fgaincod = bitstream_get (3);
+	}
+	if (state->lfeon) {
+	    state->lfeba.fsnroffst = bitstream_get (4);
+	    state->lfeba.fgaincod = bitstream_get (3);
+	}
+    }
+    if ((state->cplinu) && (bitstream_get (1))) {	// cplleake
+	do_bit_alloc = 1;
+	state->cplfleak = 2304 - (bitstream_get (3) << 8);
+	state->cplsleak = 2304 - (bitstream_get (3) << 8);
+    }
+
+    if (bitstream_get (1)) {	// deltbaie
+	do_bit_alloc = 1;
+	if (state->cplinu)
+	    state->cplba.deltbae = bitstream_get (2);
+	for (i = 0; i < nfchans; i++)
+	    state->ba[i].deltbae = bitstream_get (2);
+	if (state->cplinu && (state->cplba.deltbae == DELTA_BIT_NEW) &&
+	    parse_deltba (state->cplba.deltba))
+	    return 1;
+	for (i = 0; i < nfchans; i++)
+	    if ((state->ba[i].deltbae == DELTA_BIT_NEW) &&
+		parse_deltba (state->ba[i].deltba))
+		return 1;
+    }
+
+    if (do_bit_alloc) {
+	if (zero_snr_offsets (nfchans, state)) {
+	    memset (state->cpl_bap, 0, sizeof (state->cpl_bap));
+	    memset (state->fbw_bap, 0, sizeof (state->fbw_bap));
+	    memset (state->lfe_bap, 0, sizeof (state->lfe_bap));
+	} else {
+	    if (state->cplinu)
+		bit_allocate (state, &state->cplba, state->cplstrtbnd,
+			      state->cplstrtmant, state->cplendmant,
+			      state->cplfleak, state->cplsleak,
+			      state->cpl_exp, state->cpl_bap);
+	    for (i = 0; i < nfchans; i++)
+		bit_allocate (state, state->ba + i, 0, 0, state->endmant[i],
+			      0, 0, state->fbw_exp[i], state->fbw_bap[i]);
+	    if (state->lfeon) {
+		state->lfeba.deltbae = DELTA_BIT_NONE;
+		bit_allocate (state, &state->lfeba, 0, 0, 7, 0, 0,
+			      state->lfe_exp, state->lfe_bap);
+	    }
+	}
+    }
+
+    if (bitstream_get (1)) {	// skiple
+	i = bitstream_get (9);	// skipl
+	while (i--)
+	    bitstream_get (8);
+    }
+
+    q_1_pointer = q_2_pointer = q_4_pointer = -1;
+    done_cpl = 0;
+
+    for (i = 0; i < nfchans; i++) {
+	int j;
+
+	coeff_get (samples[i], state->fbw_exp[i], state->fbw_bap[i],
+		   dithflag[i], state->endmant[i]);
+
+	if (state->cplinu && state->chincpl[i]) {
+	    if (!done_cpl) {
+		int i, i_end, bnd, sub_bnd, ch;
+		float cplcoeff;
+
+		done_cpl = 1;
+
+#define bap state->cpl_bap
+#define exp state->cpl_exp
+
+		sub_bnd = bnd = 0;
+		i = state->cplstrtmant;
+		while (i < state->cplendmant) {
+		    i_end = i + 12;
+		    while (state->cplbndstrc[sub_bnd++])
+			i_end += 12;
+
+		    while (i < i_end) {
+			GET_COEFF (COUPLING_COEFF, COUPLING_DITHER);
+			for (ch = 0; ch < nfchans; ch++)
+			    if (state->chincpl[ch])
+				samples[ch][i] =
+				    state->cplco[ch][bnd] * cplcoeff;
+			i++;
+		    }
+		    bnd++;
+		}
+
+#undef bap
+#undef exp
+	    }
+	    j = state->cplendmant;
+	} else
+	    j = state->endmant[i];
+	for (; j < 256; j++)
+	    samples[i][j] = 0;
+    }
+
+    if (state->acmod == 2) {
+	int j, end, band;
+
+	end = ((state->endmant[0] < state->endmant[1]) ?
+	       state->endmant[0] : state->endmant[1]);
+
+	i = 0;
+	j = 13;
+	do {
+	    if (!state->rematflg[i]) {
+		j = rematrix_band[i++];
+		continue;
+	    }
+	    band = rematrix_band[i++];
+	    if (band > end)
+		band = end;
+	    do {
+		float tmp0, tmp1;
+
+		tmp0 = samples[0][j];
+		tmp1 = samples[1][j];
+		samples[0][j] = tmp0 + tmp1;
+		samples[1][j] = tmp0 - tmp1;
+	    } while (++j < band);
+	} while (j < end);
+    }
+
+    if (state->lfeon) {
+	coeff_get (samples[5], state->lfe_exp, state->lfe_bap, 0, 7);
+#if 0
+	for (i = 7; i < 256; i++)
+	    samples[5][i] = 0;
+#endif
+    }
+
+    for (i = 0; i < nfchans; i++)
+	if (blksw[i])
+            imdct_256 (samples[i], delay[i]);
+        else 
+            imdct_512 (samples[i], delay[i]);
+
+#if 0
+    if (state->lfeon)
+	imdct_512 (samples[5], delay[5]);
+#endif
+
+    downmix (*samples, state->acmod, state->output, state->level, state->bias,
+	     state->clev, state->slev);
+
+    return 0;
+}
diff --git a/libavcodec/libac3/tables.h b/libavcodec/libac3/tables.h
new file mode 100644
index 0000000000..5825f9326a
--- /dev/null
+++ b/libavcodec/libac3/tables.h
@@ -0,0 +1,250 @@
+/* 
+ *    parse.c
+ *
+ *	Copyright (C) Aaron Holtzman - May 1999
+ *
+ *  This file is part of ac3dec, a free Dolby AC-3 stream decoder.
+ *	
+ *  ac3dec 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, or (at your option)
+ *  any later version.
+ *   
+ *  ac3dec 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 GNU Make; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 
+ *
+ *
+ */
+
+static int8_t exp_1[128] = {
+    -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,
+    -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+     2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+    25,25,25
+};
+static int8_t exp_2[128] = {
+    -2,-2,-2,-2,-2,-1,-1,-1,-1,-1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2,
+    -2,-2,-2,-2,-2,-1,-1,-1,-1,-1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2,
+    -2,-2,-2,-2,-2,-1,-1,-1,-1,-1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2,
+    -2,-2,-2,-2,-2,-1,-1,-1,-1,-1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2,
+    -2,-2,-2,-2,-2,-1,-1,-1,-1,-1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2,
+    25,25,25
+};
+static int8_t exp_3[128] = {
+    -2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,
+    -2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,
+    -2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,
+    -2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,
+    -2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,
+    25,25,25
+};
+
+#define Q0 ((-2 << 15) / 3.0)
+#define Q1 (0)
+#define Q2 ((2 << 15) / 3.0)
+
+static const float q_1_0[ 32 ] = {
+    Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,
+    Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,
+    Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,
+    0,0,0,0,0
+};
+
+static const float q_1_1[ 32 ] = {
+    Q0,Q0,Q0,Q1,Q1,Q1,Q2,Q2,Q2,
+    Q0,Q0,Q0,Q1,Q1,Q1,Q2,Q2,Q2,
+    Q0,Q0,Q0,Q1,Q1,Q1,Q2,Q2,Q2,
+    0,0,0,0,0
+};
+
+static const float q_1_2[ 32 ] = {
+    Q0,Q1,Q2,Q0,Q1,Q2,Q0,Q1,Q2,
+    Q0,Q1,Q2,Q0,Q1,Q2,Q0,Q1,Q2,
+    Q0,Q1,Q2,Q0,Q1,Q2,Q0,Q1,Q2,
+    0,0,0,0,0
+};
+
+#undef Q0
+#undef Q1
+#undef Q2
+
+#define Q0 ((-4 << 15) / 5.0)
+#define Q1 ((-2 << 15) / 5.0)
+#define Q2 (0)
+#define Q3 ((2 << 15) / 5.0)
+#define Q4 ((4 << 15) / 5.0)
+
+static const float q_2_0[ 128 ] = {
+    Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,
+    Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,
+    Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,
+    Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,
+    Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,
+    0,0,0
+};
+
+static const float q_2_1[ 128 ] = {
+    Q0,Q0,Q0,Q0,Q0,Q1,Q1,Q1,Q1,Q1,Q2,Q2,Q2,Q2,Q2,Q3,Q3,Q3,Q3,Q3,Q4,Q4,Q4,Q4,Q4,
+    Q0,Q0,Q0,Q0,Q0,Q1,Q1,Q1,Q1,Q1,Q2,Q2,Q2,Q2,Q2,Q3,Q3,Q3,Q3,Q3,Q4,Q4,Q4,Q4,Q4,
+    Q0,Q0,Q0,Q0,Q0,Q1,Q1,Q1,Q1,Q1,Q2,Q2,Q2,Q2,Q2,Q3,Q3,Q3,Q3,Q3,Q4,Q4,Q4,Q4,Q4,
+    Q0,Q0,Q0,Q0,Q0,Q1,Q1,Q1,Q1,Q1,Q2,Q2,Q2,Q2,Q2,Q3,Q3,Q3,Q3,Q3,Q4,Q4,Q4,Q4,Q4,
+    Q0,Q0,Q0,Q0,Q0,Q1,Q1,Q1,Q1,Q1,Q2,Q2,Q2,Q2,Q2,Q3,Q3,Q3,Q3,Q3,Q4,Q4,Q4,Q4,Q4,
+    0,0,0
+};
+
+static const float q_2_2[ 128 ] = {
+    Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,
+    Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,
+    Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,
+    Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,
+    Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,
+    0,0,0
+};
+
+#undef Q0
+#undef Q1
+#undef Q2
+#undef Q3
+#undef Q4
+
+static const float q_3[8] = {
+    (-6 << 15)/7.0, (-4 << 15)/7.0, (-2 << 15)/7.0, 0,
+    ( 2 << 15)/7.0, ( 4 << 15)/7.0, ( 6 << 15)/7.0, 0
+};
+
+#define Q0 ((-10 << 15) / 11.0)
+#define Q1 ((-8 << 15) / 11.0)
+#define Q2 ((-6 << 15) / 11.0)
+#define Q3 ((-4 << 15) / 11.0)
+#define Q4 ((-2 << 15) / 11.0)
+#define Q5 (0)
+#define Q6 ((2 << 15) / 11.0)
+#define Q7 ((4 << 15) / 11.0)
+#define Q8 ((6 << 15) / 11.0)
+#define Q9 ((8 << 15) / 11.0)
+#define QA ((10 << 15) / 11.0)
+
+static const float q_4_0[ 128 ] = {
+    Q0, Q0, Q0, Q0, Q0, Q0, Q0, Q0, Q0, Q0, Q0,
+    Q1, Q1, Q1, Q1, Q1, Q1, Q1, Q1, Q1, Q1, Q1,
+    Q2, Q2, Q2, Q2, Q2, Q2, Q2, Q2, Q2, Q2, Q2,
+    Q3, Q3, Q3, Q3, Q3, Q3, Q3, Q3, Q3, Q3, Q3,
+    Q4, Q4, Q4, Q4, Q4, Q4, Q4, Q4, Q4, Q4, Q4,
+    Q5, Q5, Q5, Q5, Q5, Q5, Q5, Q5, Q5, Q5, Q5,
+    Q6, Q6, Q6, Q6, Q6, Q6, Q6, Q6, Q6, Q6, Q6,
+    Q7, Q7, Q7, Q7, Q7, Q7, Q7, Q7, Q7, Q7, Q7,
+    Q8, Q8, Q8, Q8, Q8, Q8, Q8, Q8, Q8, Q8, Q8,
+    Q9, Q9, Q9, Q9, Q9, Q9, Q9, Q9, Q9, Q9, Q9,
+    QA, QA, QA, QA, QA, QA, QA, QA, QA, QA, QA,
+    0,  0,  0,  0,  0,  0,  0
+};
+
+static const float q_4_1[ 128 ] = {
+    Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
+    Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
+    Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
+    Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
+    Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
+    Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
+    Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
+    Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
+    Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
+    Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
+    Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
+    0,  0,  0,  0,  0,  0,  0
+};
+
+#undef Q0
+#undef Q1
+#undef Q2
+#undef Q3
+#undef Q4
+#undef Q5
+#undef Q6
+#undef Q7
+#undef Q8
+#undef Q9
+#undef QA
+
+static const float q_5[16] = {
+    (-14 << 15)/15.0,(-12 << 15)/15.0,(-10 << 15)/15.0,
+    ( -8 << 15)/15.0,( -6 << 15)/15.0,( -4 << 15)/15.0,
+    ( -2 << 15)/15.0,   0            ,(  2 << 15)/15.0,
+    (  4 << 15)/15.0,(  6 << 15)/15.0,(  8 << 15)/15.0,
+    ( 10 << 15)/15.0,( 12 << 15)/15.0,( 14 << 15)/15.0,
+    0
+};
+
+static const uint32_t u32_scale_factors[25] = 
+{
+	0x38000000, //2 ^ -(0 + 15)
+	0x37800000, //2 ^ -(1 + 15)
+	0x37000000, //2 ^ -(2 + 15)
+	0x36800000, //2 ^ -(3 + 15)
+	0x36000000, //2 ^ -(4 + 15)
+	0x35800000, //2 ^ -(5 + 15)
+	0x35000000, //2 ^ -(6 + 15)
+	0x34800000, //2 ^ -(7 + 15)
+	0x34000000, //2 ^ -(8 + 15)
+	0x33800000, //2 ^ -(9 + 15)
+	0x33000000, //2 ^ -(10 + 15)
+	0x32800000, //2 ^ -(11 + 15)
+	0x32000000, //2 ^ -(12 + 15)
+	0x31800000, //2 ^ -(13 + 15)
+	0x31000000, //2 ^ -(14 + 15)
+	0x30800000, //2 ^ -(15 + 15)
+	0x30000000, //2 ^ -(16 + 15)
+	0x2f800000, //2 ^ -(17 + 15)
+	0x2f000000, //2 ^ -(18 + 15)
+	0x2e800000, //2 ^ -(19 + 15)
+	0x2e000000, //2 ^ -(20 + 15)
+	0x2d800000, //2 ^ -(21 + 15)
+	0x2d000000, //2 ^ -(22 + 15)
+	0x2c800000, //2 ^ -(23 + 15)
+	0x2c000000  //2 ^ -(24 + 15)
+};
+
+static float * scale_factor = (float *) u32_scale_factors;
+
+static const uint16_t dither_lut[256] = {
+    0x0000, 0xa011, 0xe033, 0x4022, 0x6077, 0xc066, 0x8044, 0x2055,
+    0xc0ee, 0x60ff, 0x20dd, 0x80cc, 0xa099, 0x0088, 0x40aa, 0xe0bb,
+    0x21cd, 0x81dc, 0xc1fe, 0x61ef, 0x41ba, 0xe1ab, 0xa189, 0x0198,
+    0xe123, 0x4132, 0x0110, 0xa101, 0x8154, 0x2145, 0x6167, 0xc176,
+    0x439a, 0xe38b, 0xa3a9, 0x03b8, 0x23ed, 0x83fc, 0xc3de, 0x63cf,
+    0x8374, 0x2365, 0x6347, 0xc356, 0xe303, 0x4312, 0x0330, 0xa321,
+    0x6257, 0xc246, 0x8264, 0x2275, 0x0220, 0xa231, 0xe213, 0x4202,
+    0xa2b9, 0x02a8, 0x428a, 0xe29b, 0xc2ce, 0x62df, 0x22fd, 0x82ec,
+    0x8734, 0x2725, 0x6707, 0xc716, 0xe743, 0x4752, 0x0770, 0xa761,
+    0x47da, 0xe7cb, 0xa7e9, 0x07f8, 0x27ad, 0x87bc, 0xc79e, 0x678f,
+    0xa6f9, 0x06e8, 0x46ca, 0xe6db, 0xc68e, 0x669f, 0x26bd, 0x86ac,
+    0x6617, 0xc606, 0x8624, 0x2635, 0x0660, 0xa671, 0xe653, 0x4642,
+    0xc4ae, 0x64bf, 0x249d, 0x848c, 0xa4d9, 0x04c8, 0x44ea, 0xe4fb,
+    0x0440, 0xa451, 0xe473, 0x4462, 0x6437, 0xc426, 0x8404, 0x2415,
+    0xe563, 0x4572, 0x0550, 0xa541, 0x8514, 0x2505, 0x6527, 0xc536,
+    0x258d, 0x859c, 0xc5be, 0x65af, 0x45fa, 0xe5eb, 0xa5c9, 0x05d8,
+    0xae79, 0x0e68, 0x4e4a, 0xee5b, 0xce0e, 0x6e1f, 0x2e3d, 0x8e2c,
+    0x6e97, 0xce86, 0x8ea4, 0x2eb5, 0x0ee0, 0xaef1, 0xeed3, 0x4ec2,
+    0x8fb4, 0x2fa5, 0x6f87, 0xcf96, 0xefc3, 0x4fd2, 0x0ff0, 0xafe1,
+    0x4f5a, 0xef4b, 0xaf69, 0x0f78, 0x2f2d, 0x8f3c, 0xcf1e, 0x6f0f,
+    0xede3, 0x4df2, 0x0dd0, 0xadc1, 0x8d94, 0x2d85, 0x6da7, 0xcdb6,
+    0x2d0d, 0x8d1c, 0xcd3e, 0x6d2f, 0x4d7a, 0xed6b, 0xad49, 0x0d58,
+    0xcc2e, 0x6c3f, 0x2c1d, 0x8c0c, 0xac59, 0x0c48, 0x4c6a, 0xec7b,
+    0x0cc0, 0xacd1, 0xecf3, 0x4ce2, 0x6cb7, 0xcca6, 0x8c84, 0x2c95,
+    0x294d, 0x895c, 0xc97e, 0x696f, 0x493a, 0xe92b, 0xa909, 0x0918,
+    0xe9a3, 0x49b2, 0x0990, 0xa981, 0x89d4, 0x29c5, 0x69e7, 0xc9f6,
+    0x0880, 0xa891, 0xe8b3, 0x48a2, 0x68f7, 0xc8e6, 0x88c4, 0x28d5,
+    0xc86e, 0x687f, 0x285d, 0x884c, 0xa819, 0x0808, 0x482a, 0xe83b,
+    0x6ad7, 0xcac6, 0x8ae4, 0x2af5, 0x0aa0, 0xaab1, 0xea93, 0x4a82,
+    0xaa39, 0x0a28, 0x4a0a, 0xea1b, 0xca4e, 0x6a5f, 0x2a7d, 0x8a6c,
+    0x4b1a, 0xeb0b, 0xab29, 0x0b38, 0x2b6d, 0x8b7c, 0xcb5e, 0x6b4f,
+    0x8bf4, 0x2be5, 0x6bc7, 0xcbd6, 0xeb83, 0x4b92, 0x0bb0, 0xaba1
+};