summaryrefslogtreecommitdiff
path: root/libavcodec/libac3
diff options
context:
space:
mode:
Diffstat (limited to 'libavcodec/libac3')
-rw-r--r--libavcodec/libac3/ac3.h108
-rw-r--r--libavcodec/libac3/ac3_internal.h51
-rw-r--r--libavcodec/libac3/bit_allocate.c255
-rw-r--r--libavcodec/libac3/bitstream.c77
-rw-r--r--libavcodec/libac3/bitstream.h68
-rw-r--r--libavcodec/libac3/downmix.c533
-rw-r--r--libavcodec/libac3/imdct.c408
-rw-r--r--libavcodec/libac3/parse.c684
-rw-r--r--libavcodec/libac3/tables.h250
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
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-26 20:01:37 +0000