diff options
Diffstat (limited to 'faad2/src/libfaad/ps_syntax.c')
| -rw-r--r-- | faad2/src/libfaad/ps_syntax.c | 551 |
1 files changed, 551 insertions, 0 deletions
diff --git a/faad2/src/libfaad/ps_syntax.c b/faad2/src/libfaad/ps_syntax.c new file mode 100644 index 0000000..dfe8f32 --- /dev/null +++ b/faad2/src/libfaad/ps_syntax.c @@ -0,0 +1,551 @@ +/*
+** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
+** Copyright (C) 2003-2005 M. Bakker, Nero AG, http://www.nero.com
+**
+** This program is free software; you can redistribute it and/or modify
+** it under the terms of the GNU General Public License as published by
+** the Free Software Foundation; either version 2 of the License, or
+** (at your option) any later version.
+**
+** This program is distributed in the hope that it will be useful,
+** but WITHOUT ANY WARRANTY; without even the implied warranty of
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+** GNU General Public License for more details.
+**
+** You should have received a copy of the GNU General Public License
+** along with this program; if not, write to the Free Software
+** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+**
+** Any non-GPL usage of this software or parts of this software is strictly
+** forbidden.
+**
+** The "appropriate copyright message" mentioned in section 2c of the GPLv2
+** must read: "Code from FAAD2 is copyright (c) Nero AG, www.nero.com"
+**
+** Commercial non-GPL licensing of this software is possible.
+** For more info contact Nero AG through Mpeg4AAClicense@nero.com.
+**
+** $Id: ps_syntax.c,v 1.11 2007/11/01 12:33:33 menno Exp $
+**/
+
+#include "common.h"
+
+#ifdef PS_DEC
+
+#include "bits.h"
+#include "ps_dec.h"
+
+/* type definitaions */
+typedef const int8_t (*ps_huff_tab)[2];
+
+/* static data tables */
+static const uint8_t nr_iid_par_tab[] = {
+ 10, 20, 34, 10, 20, 34, 0, 0
+};
+static const uint8_t nr_ipdopd_par_tab[] = {
+ 5, 11, 17, 5, 11, 17, 0, 0
+};
+static const uint8_t nr_icc_par_tab[] = {
+ 10, 20, 34, 10, 20, 34, 0, 0
+};
+static const uint8_t num_env_tab[][4] = {
+ { 0, 1, 2, 4 },
+ { 1, 2, 3, 4 }
+};
+
+/* binary lookup huffman tables */
+static const int8_t f_huff_iid_def[][2] = {
+ { /*0*/ -31, 1 }, /* index 0: 1 bits: x */
+ { 2, 3 }, /* index 1: 2 bits: 1x */
+ { /*1*/ -30, /*-1*/ -32 }, /* index 2: 3 bits: 10x */
+ { 4, 5 }, /* index 3: 3 bits: 11x */
+ { /*2*/ -29, /*-2*/ -33 }, /* index 4: 4 bits: 110x */
+ { 6, 7 }, /* index 5: 4 bits: 111x */
+ { /*3*/ -28, /*-3*/ -34 }, /* index 6: 5 bits: 1110x */
+ { 8, 9 }, /* index 7: 5 bits: 1111x */
+ { /*-4*/ -35, /*4*/ -27 }, /* index 8: 6 bits: 11110x */
+ { /*5*/ -26, 10 }, /* index 9: 6 bits: 11111x */
+ { /*-5*/ -36, 11 }, /* index 10: 7 bits: 111111x */
+ { /*6*/ -25, 12 }, /* index 11: 8 bits: 1111111x */
+ { /*-6*/ -37, 13 }, /* index 12: 9 bits: 11111111x */
+ { /*-7*/ -38, 14 }, /* index 13: 10 bits: 111111111x */
+ { /*7*/ -24, 15 }, /* index 14: 11 bits: 1111111111x */
+ { 16, 17 }, /* index 15: 12 bits: 11111111111x */
+ { /*8*/ -23, /*-8*/ -39 }, /* index 16: 13 bits: 111111111110x */
+ { 18, 19 }, /* index 17: 13 bits: 111111111111x */
+ { /*9*/ -22, /*10*/ -21 }, /* index 18: 14 bits: 1111111111110x */
+ { 20, 21 }, /* index 19: 14 bits: 1111111111111x */
+ { /*-9*/ -40, /*11*/ -20 }, /* index 20: 15 bits: 11111111111110x */
+ { 22, 23 }, /* index 21: 15 bits: 11111111111111x */
+ { /*-10*/ -41, 24 }, /* index 22: 16 bits: 111111111111110x */
+ { 25, 26 }, /* index 23: 16 bits: 111111111111111x */
+ { /*-11*/ -42, /*-14*/ -45 }, /* index 24: 17 bits: 1111111111111101x */
+ { /*-13*/ -44, /*-12*/ -43 }, /* index 25: 17 bits: 1111111111111110x */
+ { /*12*/ -19, 27 }, /* index 26: 17 bits: 1111111111111111x */
+ { /*13*/ -18, /*14*/ -17 } /* index 27: 18 bits: 11111111111111111x */
+};
+
+static const int8_t t_huff_iid_def[][2] = {
+ { /*0*/ -31, 1 }, /* index 0: 1 bits: x */
+ { /*-1*/ -32, 2 }, /* index 1: 2 bits: 1x */
+ { /*1*/ -30, 3 }, /* index 2: 3 bits: 11x */
+ { /*-2*/ -33, 4 }, /* index 3: 4 bits: 111x */
+ { /*2*/ -29, 5 }, /* index 4: 5 bits: 1111x */
+ { /*-3*/ -34, 6 }, /* index 5: 6 bits: 11111x */
+ { /*3*/ -28, 7 }, /* index 6: 7 bits: 111111x */
+ { /*-4*/ -35, 8 }, /* index 7: 8 bits: 1111111x */
+ { /*4*/ -27, 9 }, /* index 8: 9 bits: 11111111x */
+ { /*-5*/ -36, 10 }, /* index 9: 10 bits: 111111111x */
+ { /*5*/ -26, 11 }, /* index 10: 11 bits: 1111111111x */
+ { /*-6*/ -37, 12 }, /* index 11: 12 bits: 11111111111x */
+ { /*6*/ -25, 13 }, /* index 12: 13 bits: 111111111111x */
+ { /*7*/ -24, 14 }, /* index 13: 14 bits: 1111111111111x */
+ { /*-7*/ -38, 15 }, /* index 14: 15 bits: 11111111111111x */
+ { 16, 17 }, /* index 15: 16 bits: 111111111111111x */
+ { /*8*/ -23, /*-8*/ -39 }, /* index 16: 17 bits: 1111111111111110x */
+ { 18, 19 }, /* index 17: 17 bits: 1111111111111111x */
+ { 20, 21 }, /* index 18: 18 bits: 11111111111111110x */
+ { 22, 23 }, /* index 19: 18 bits: 11111111111111111x */
+ { /*9*/ -22, /*-14*/ -45 }, /* index 20: 19 bits: 111111111111111100x */
+ { /*-13*/ -44, /*-12*/ -43 }, /* index 21: 19 bits: 111111111111111101x */
+ { 24, 25 }, /* index 22: 19 bits: 111111111111111110x */
+ { 26, 27 }, /* index 23: 19 bits: 111111111111111111x */
+ { /*-11*/ -42, /*-10*/ -41 }, /* index 24: 20 bits: 1111111111111111100x */
+ { /*-9*/ -40, /*10*/ -21 }, /* index 25: 20 bits: 1111111111111111101x */
+ { /*11*/ -20, /*12*/ -19 }, /* index 26: 20 bits: 1111111111111111110x */
+ { /*13*/ -18, /*14*/ -17 } /* index 27: 20 bits: 1111111111111111111x */
+};
+
+static const int8_t f_huff_iid_fine[][2] = {
+ { 1, /*0*/ -31 }, /* index 0: 1 bits: x */
+ { 2, 3 }, /* index 1: 2 bits: 0x */
+ { 4, /*-1*/ -32 }, /* index 2: 3 bits: 00x */
+ { /*1*/ -30, 5 }, /* index 3: 3 bits: 01x */
+ { /*-2*/ -33, /*2*/ -29 }, /* index 4: 4 bits: 000x */
+ { 6, 7 }, /* index 5: 4 bits: 011x */
+ { /*-3*/ -34, /*3*/ -28 }, /* index 6: 5 bits: 0110x */
+ { 8, 9 }, /* index 7: 5 bits: 0111x */
+ { /*-4*/ -35, /*4*/ -27 }, /* index 8: 6 bits: 01110x */
+ { 10, 11 }, /* index 9: 6 bits: 01111x */
+ { /*-5*/ -36, /*5*/ -26 }, /* index 10: 7 bits: 011110x */
+ { 12, 13 }, /* index 11: 7 bits: 011111x */
+ { /*-6*/ -37, /*6*/ -25 }, /* index 12: 8 bits: 0111110x */
+ { 14, 15 }, /* index 13: 8 bits: 0111111x */
+ { /*7*/ -24, 16 }, /* index 14: 9 bits: 01111110x */
+ { 17, 18 }, /* index 15: 9 bits: 01111111x */
+ { 19, /*-8*/ -39 }, /* index 16: 10 bits: 011111101x */
+ { /*8*/ -23, 20 }, /* index 17: 10 bits: 011111110x */
+ { 21, /*-7*/ -38 }, /* index 18: 10 bits: 011111111x */
+ { /*10*/ -21, 22 }, /* index 19: 11 bits: 0111111010x */
+ { 23, /*-9*/ -40 }, /* index 20: 11 bits: 0111111101x */
+ { /*9*/ -22, 24 }, /* index 21: 11 bits: 0111111110x */
+ { /*-11*/ -42, /*11*/ -20 }, /* index 22: 12 bits: 01111110101x */
+ { 25, 26 }, /* index 23: 12 bits: 01111111010x */
+ { 27, /*-10*/ -41 }, /* index 24: 12 bits: 01111111101x */
+ { 28, /*-12*/ -43 }, /* index 25: 13 bits: 011111110100x */
+ { /*12*/ -19, 29 }, /* index 26: 13 bits: 011111110101x */
+ { 30, 31 }, /* index 27: 13 bits: 011111111010x */
+ { 32, /*-14*/ -45 }, /* index 28: 14 bits: 0111111101000x */
+ { /*14*/ -17, 33 }, /* index 29: 14 bits: 0111111101011x */
+ { 34, /*-13*/ -44 }, /* index 30: 14 bits: 0111111110100x */
+ { /*13*/ -18, 35 }, /* index 31: 14 bits: 0111111110101x */
+ { 36, 37 }, /* index 32: 15 bits: 01111111010000x */
+ { 38, /*-15*/ -46 }, /* index 33: 15 bits: 01111111010111x */
+ { /*15*/ -16, 39 }, /* index 34: 15 bits: 01111111101000x */
+ { 40, 41 }, /* index 35: 15 bits: 01111111101011x */
+ { 42, 43 }, /* index 36: 16 bits: 011111110100000x */
+ { /*-17*/ -48, /*17*/ -14 }, /* index 37: 16 bits: 011111110100001x */
+ { 44, 45 }, /* index 38: 16 bits: 011111110101110x */
+ { 46, 47 }, /* index 39: 16 bits: 011111111010001x */
+ { 48, 49 }, /* index 40: 16 bits: 011111111010110x */
+ { /*-16*/ -47, /*16*/ -15 }, /* index 41: 16 bits: 011111111010111x */
+ { /*-21*/ -52, /*21*/ -10 }, /* index 42: 17 bits: 0111111101000000x */
+ { /*-19*/ -50, /*19*/ -12 }, /* index 43: 17 bits: 0111111101000001x */
+ { /*-18*/ -49, /*18*/ -13 }, /* index 44: 17 bits: 0111111101011100x */
+ { 50, 51 }, /* index 45: 17 bits: 0111111101011101x */
+ { 52, 53 }, /* index 46: 17 bits: 0111111110100010x */
+ { 54, 55 }, /* index 47: 17 bits: 0111111110100011x */
+ { 56, 57 }, /* index 48: 17 bits: 0111111110101100x */
+ { 58, 59 }, /* index 49: 17 bits: 0111111110101101x */
+ { /*-26*/ -57, /*-25*/ -56 }, /* index 50: 18 bits: 01111111010111010x */
+ { /*-28*/ -59, /*-27*/ -58 }, /* index 51: 18 bits: 01111111010111011x */
+ { /*-22*/ -53, /*22*/ -9 }, /* index 52: 18 bits: 01111111101000100x */
+ { /*-24*/ -55, /*-23*/ -54 }, /* index 53: 18 bits: 01111111101000101x */
+ { /*25*/ -6, /*26*/ -5 }, /* index 54: 18 bits: 01111111101000110x */
+ { /*23*/ -8, /*24*/ -7 }, /* index 55: 18 bits: 01111111101000111x */
+ { /*29*/ -2, /*30*/ -1 }, /* index 56: 18 bits: 01111111101011000x */
+ { /*27*/ -4, /*28*/ -3 }, /* index 57: 18 bits: 01111111101011001x */
+ { /*-30*/ -61, /*-29*/ -60 }, /* index 58: 18 bits: 01111111101011010x */
+ { /*-20*/ -51, /*20*/ -11 } /* index 59: 18 bits: 01111111101011011x */
+};
+
+static const int8_t t_huff_iid_fine[][2] = {
+ { 1, /*0*/ -31 }, /* index 0: 1 bits: x */
+ { /*1*/ -30, 2 }, /* index 1: 2 bits: 0x */
+ { 3, /*-1*/ -32 }, /* index 2: 3 bits: 01x */
+ { 4, 5 }, /* index 3: 4 bits: 010x */
+ { 6, 7 }, /* index 4: 5 bits: 0100x */
+ { /*-2*/ -33, /*2*/ -29 }, /* index 5: 5 bits: 0101x */
+ { 8, /*-3*/ -34 }, /* index 6: 6 bits: 01000x */
+ { /*3*/ -28, 9 }, /* index 7: 6 bits: 01001x */
+ { /*-4*/ -35, /*4*/ -27 }, /* index 8: 7 bits: 010000x */
+ { 10, 11 }, /* index 9: 7 bits: 010011x */
+ { /*5*/ -26, 12 }, /* index 10: 8 bits: 0100110x */
+ { 13, 14 }, /* index 11: 8 bits: 0100111x */
+ { /*-6*/ -37, /*6*/ -25 }, /* index 12: 9 bits: 01001101x */
+ { 15, 16 }, /* index 13: 9 bits: 01001110x */
+ { 17, /*-5*/ -36 }, /* index 14: 9 bits: 01001111x */
+ { 18, /*-7*/ -38 }, /* index 15: 10 bits: 010011100x */
+ { /*7*/ -24, 19 }, /* index 16: 10 bits: 010011101x */
+ { 20, 21 }, /* index 17: 10 bits: 010011110x */
+ { /*9*/ -22, 22 }, /* index 18: 11 bits: 0100111000x */
+ { 23, 24 }, /* index 19: 11 bits: 0100111011x */
+ { /*-8*/ -39, /*8*/ -23 }, /* index 20: 11 bits: 0100111100x */
+ { 25, 26 }, /* index 21: 11 bits: 0100111101x */
+ { /*11*/ -20, 27 }, /* index 22: 12 bits: 01001110001x */
+ { 28, 29 }, /* index 23: 12 bits: 01001110110x */
+ { /*-10*/ -41, /*10*/ -21 }, /* index 24: 12 bits: 01001110111x */
+ { 30, 31 }, /* index 25: 12 bits: 01001111010x */
+ { 32, /*-9*/ -40 }, /* index 26: 12 bits: 01001111011x */
+ { 33, /*-13*/ -44 }, /* index 27: 13 bits: 010011100011x */
+ { /*13*/ -18, 34 }, /* index 28: 13 bits: 010011101100x */
+ { 35, 36 }, /* index 29: 13 bits: 010011101101x */
+ { 37, /*-12*/ -43 }, /* index 30: 13 bits: 010011110100x */
+ { /*12*/ -19, 38 }, /* index 31: 13 bits: 010011110101x */
+ { 39, /*-11*/ -42 }, /* index 32: 13 bits: 010011110110x */
+ { 40, 41 }, /* index 33: 14 bits: 0100111000110x */
+ { 42, 43 }, /* index 34: 14 bits: 0100111011001x */
+ { 44, 45 }, /* index 35: 14 bits: 0100111011010x */
+ { 46, /*-15*/ -46 }, /* index 36: 14 bits: 0100111011011x */
+ { /*15*/ -16, 47 }, /* index 37: 14 bits: 0100111101000x */
+ { /*-14*/ -45, /*14*/ -17 }, /* index 38: 14 bits: 0100111101011x */
+ { 48, 49 }, /* index 39: 14 bits: 0100111101100x */
+ { /*-21*/ -52, /*-20*/ -51 }, /* index 40: 15 bits: 01001110001100x */
+ { /*18*/ -13, /*19*/ -12 }, /* index 41: 15 bits: 01001110001101x */
+ { /*-19*/ -50, /*-18*/ -49 }, /* index 42: 15 bits: 01001110110010x */
+ { 50, 51 }, /* index 43: 15 bits: 01001110110011x */
+ { 52, 53 }, /* index 44: 15 bits: 01001110110100x */
+ { 54, 55 }, /* index 45: 15 bits: 01001110110101x */
+ { 56, /*-17*/ -48 }, /* index 46: 15 bits: 01001110110110x */
+ { /*17*/ -14, 57 }, /* index 47: 15 bits: 01001111010001x */
+ { 58, /*-16*/ -47 }, /* index 48: 15 bits: 01001111011000x */
+ { /*16*/ -15, 59 }, /* index 49: 15 bits: 01001111011001x */
+ { /*-26*/ -57, /*26*/ -5 }, /* index 50: 16 bits: 010011101100110x */
+ { /*-28*/ -59, /*-27*/ -58 }, /* index 51: 16 bits: 010011101100111x */
+ { /*29*/ -2, /*30*/ -1 }, /* index 52: 16 bits: 010011101101000x */
+ { /*27*/ -4, /*28*/ -3 }, /* index 53: 16 bits: 010011101101001x */
+ { /*-30*/ -61, /*-29*/ -60 }, /* index 54: 16 bits: 010011101101010x */
+ { /*-25*/ -56, /*25*/ -6 }, /* index 55: 16 bits: 010011101101011x */
+ { /*-24*/ -55, /*24*/ -7 }, /* index 56: 16 bits: 010011101101100x */
+ { /*-23*/ -54, /*23*/ -8 }, /* index 57: 16 bits: 010011110100011x */
+ { /*-22*/ -53, /*22*/ -9 }, /* index 58: 16 bits: 010011110110000x */
+ { /*20*/ -11, /*21*/ -10 } /* index 59: 16 bits: 010011110110011x */
+};
+
+static const int8_t f_huff_icc[][2] = {
+ { /*0*/ -31, 1 }, /* index 0: 1 bits: x */
+ { /*1*/ -30, 2 }, /* index 1: 2 bits: 1x */
+ { /*-1*/ -32, 3 }, /* index 2: 3 bits: 11x */
+ { /*2*/ -29, 4 }, /* index 3: 4 bits: 111x */
+ { /*-2*/ -33, 5 }, /* index 4: 5 bits: 1111x */
+ { /*3*/ -28, 6 }, /* index 5: 6 bits: 11111x */
+ { /*-3*/ -34, 7 }, /* index 6: 7 bits: 111111x */
+ { /*4*/ -27, 8 }, /* index 7: 8 bits: 1111111x */
+ { /*5*/ -26, 9 }, /* index 8: 9 bits: 11111111x */
+ { /*-4*/ -35, 10 }, /* index 9: 10 bits: 111111111x */
+ { /*6*/ -25, 11 }, /* index 10: 11 bits: 1111111111x */
+ { /*-5*/ -36, 12 }, /* index 11: 12 bits: 11111111111x */
+ { /*7*/ -24, 13 }, /* index 12: 13 bits: 111111111111x */
+ { /*-6*/ -37, /*-7*/ -38 } /* index 13: 14 bits: 1111111111111x */
+};
+
+static const int8_t t_huff_icc[][2] = {
+ { /*0*/ -31, 1 }, /* index 0: 1 bits: x */
+ { /*1*/ -30, 2 }, /* index 1: 2 bits: 1x */
+ { /*-1*/ -32, 3 }, /* index 2: 3 bits: 11x */
+ { /*2*/ -29, 4 }, /* index 3: 4 bits: 111x */
+ { /*-2*/ -33, 5 }, /* index 4: 5 bits: 1111x */
+ { /*3*/ -28, 6 }, /* index 5: 6 bits: 11111x */
+ { /*-3*/ -34, 7 }, /* index 6: 7 bits: 111111x */
+ { /*4*/ -27, 8 }, /* index 7: 8 bits: 1111111x */
+ { /*-4*/ -35, 9 }, /* index 8: 9 bits: 11111111x */
+ { /*5*/ -26, 10 }, /* index 9: 10 bits: 111111111x */
+ { /*-5*/ -36, 11 }, /* index 10: 11 bits: 1111111111x */
+ { /*6*/ -25, 12 }, /* index 11: 12 bits: 11111111111x */
+ { /*-6*/ -37, 13 }, /* index 12: 13 bits: 111111111111x */
+ { /*-7*/ -38, /*7*/ -24 } /* index 13: 14 bits: 1111111111111x */
+};
+
+static const int8_t f_huff_ipd[][2] = {
+ { 1, /*0*/ -31 }, /* index 0: 1 bits: x */
+ { 2, 3 }, /* index 1: 2 bits: 0x */
+ { /*1*/ -30, 4 }, /* index 2: 3 bits: 00x */
+ { 5, 6 }, /* index 3: 3 bits: 01x */
+ { /*4*/ -27, /*5*/ -26 }, /* index 4: 4 bits: 001x */
+ { /*3*/ -28, /*6*/ -25 }, /* index 5: 4 bits: 010x */
+ { /*2*/ -29, /*7*/ -24 } /* index 6: 4 bits: 011x */
+};
+
+static const int8_t t_huff_ipd[][2] = {
+ { 1, /*0*/ -31 }, /* index 0: 1 bits: x */
+ { 2, 3 }, /* index 1: 2 bits: 0x */
+ { 4, 5 }, /* index 2: 3 bits: 00x */
+ { /*1*/ -30, /*7*/ -24 }, /* index 3: 3 bits: 01x */
+ { /*5*/ -26, 6 }, /* index 4: 4 bits: 000x */
+ { /*2*/ -29, /*6*/ -25 }, /* index 5: 4 bits: 001x */
+ { /*4*/ -27, /*3*/ -28 } /* index 6: 5 bits: 0001x */
+};
+
+static const int8_t f_huff_opd[][2] = {
+ { 1, /*0*/ -31 }, /* index 0: 1 bits: x */
+ { 2, 3 }, /* index 1: 2 bits: 0x */
+ { /*7*/ -24, /*1*/ -30 }, /* index 2: 3 bits: 00x */
+ { 4, 5 }, /* index 3: 3 bits: 01x */
+ { /*3*/ -28, /*6*/ -25 }, /* index 4: 4 bits: 010x */
+ { /*2*/ -29, 6 }, /* index 5: 4 bits: 011x */
+ { /*5*/ -26, /*4*/ -27 } /* index 6: 5 bits: 0111x */
+};
+
+static const int8_t t_huff_opd[][2] = {
+ { 1, /*0*/ -31 }, /* index 0: 1 bits: x */
+ { 2, 3 }, /* index 1: 2 bits: 0x */
+ { 4, 5 }, /* index 2: 3 bits: 00x */
+ { /*1*/ -30, /*7*/ -24 }, /* index 3: 3 bits: 01x */
+ { /*5*/ -26, /*2*/ -29 }, /* index 4: 4 bits: 000x */
+ { /*6*/ -25, 6 }, /* index 5: 4 bits: 001x */
+ { /*4*/ -27, /*3*/ -28 } /* index 6: 5 bits: 0011x */
+};
+
+/* static function declarations */
+static uint16_t ps_extension(ps_info *ps, bitfile *ld,
+ const uint8_t ps_extension_id,
+ const uint16_t num_bits_left);
+static void huff_data(bitfile *ld, const uint8_t dt, const uint8_t nr_par,
+ ps_huff_tab t_huff, ps_huff_tab f_huff, int8_t *par);
+static INLINE int8_t ps_huff_dec(bitfile *ld, ps_huff_tab t_huff);
+
+
+uint16_t ps_data(ps_info *ps, bitfile *ld, uint8_t *header)
+{
+ uint8_t tmp, n;
+ uint16_t bits = (uint16_t)faad_get_processed_bits(ld);
+
+ *header = 0;
+
+ /* check for new PS header */
+ if (faad_get1bit(ld
+ DEBUGVAR(1,1000,"ps_data(): enable_ps_header")))
+ {
+ *header = 1;
+
+ ps->header_read = 1;
+
+ ps->use34hybrid_bands = 0;
+
+ /* Inter-channel Intensity Difference (IID) parameters enabled */
+ ps->enable_iid = (uint8_t)faad_get1bit(ld
+ DEBUGVAR(1,1001,"ps_data(): enable_iid"));
+
+ if (ps->enable_iid)
+ {
+ ps->iid_mode = (uint8_t)faad_getbits(ld, 3
+ DEBUGVAR(1,1002,"ps_data(): iid_mode"));
+
+ ps->nr_iid_par = nr_iid_par_tab[ps->iid_mode];
+ ps->nr_ipdopd_par = nr_ipdopd_par_tab[ps->iid_mode];
+
+ if (ps->iid_mode == 2 || ps->iid_mode == 5)
+ ps->use34hybrid_bands = 1;
+
+ /* IPD freq res equal to IID freq res */
+ ps->ipd_mode = ps->iid_mode;
+ }
+
+ /* Inter-channel Coherence (ICC) parameters enabled */
+ ps->enable_icc = (uint8_t)faad_get1bit(ld
+ DEBUGVAR(1,1003,"ps_data(): enable_icc"));
+
+ if (ps->enable_icc)
+ {
+ ps->icc_mode = (uint8_t)faad_getbits(ld, 3
+ DEBUGVAR(1,1004,"ps_data(): icc_mode"));
+
+ ps->nr_icc_par = nr_icc_par_tab[ps->icc_mode];
+
+ if (ps->icc_mode == 2 || ps->icc_mode == 5)
+ ps->use34hybrid_bands = 1;
+ }
+
+ /* PS extension layer enabled */
+ ps->enable_ext = (uint8_t)faad_get1bit(ld
+ DEBUGVAR(1,1005,"ps_data(): enable_ext"));
+ }
+
+ /* we are here, but no header has been read yet */
+ if (ps->header_read == 0)
+ {
+ ps->ps_data_available = 0;
+ return 1;
+ }
+
+ ps->frame_class = (uint8_t)faad_get1bit(ld
+ DEBUGVAR(1,1006,"ps_data(): frame_class"));
+ tmp = (uint8_t)faad_getbits(ld, 2
+ DEBUGVAR(1,1007,"ps_data(): num_env_idx"));
+
+ ps->num_env = num_env_tab[ps->frame_class][tmp];
+
+ if (ps->frame_class)
+ {
+ for (n = 1; n < ps->num_env+1; n++)
+ {
+ ps->border_position[n] = (uint8_t)faad_getbits(ld, 5
+ DEBUGVAR(1,1008,"ps_data(): border_position")) + 1;
+ }
+ }
+
+ if (ps->enable_iid)
+ {
+ for (n = 0; n < ps->num_env; n++)
+ {
+ ps->iid_dt[n] = (uint8_t)faad_get1bit(ld
+ DEBUGVAR(1,1009,"ps_data(): iid_dt"));
+
+ /* iid_data */
+ if (ps->iid_mode < 3)
+ {
+ huff_data(ld, ps->iid_dt[n], ps->nr_iid_par, t_huff_iid_def,
+ f_huff_iid_def, ps->iid_index[n]);
+ } else {
+ huff_data(ld, ps->iid_dt[n], ps->nr_iid_par, t_huff_iid_fine,
+ f_huff_iid_fine, ps->iid_index[n]);
+ }
+ }
+ }
+
+ if (ps->enable_icc)
+ {
+ for (n = 0; n < ps->num_env; n++)
+ {
+ ps->icc_dt[n] = (uint8_t)faad_get1bit(ld
+ DEBUGVAR(1,1010,"ps_data(): icc_dt"));
+
+ /* icc_data */
+ huff_data(ld, ps->icc_dt[n], ps->nr_icc_par, t_huff_icc,
+ f_huff_icc, ps->icc_index[n]);
+ }
+ }
+
+ if (ps->enable_ext)
+ {
+ uint16_t num_bits_left;
+ uint16_t cnt = (uint16_t)faad_getbits(ld, 4
+ DEBUGVAR(1,1011,"ps_data(): ps_extension_size"));
+ if (cnt == 15)
+ {
+ cnt += (uint16_t)faad_getbits(ld, 8
+ DEBUGVAR(1,1012,"ps_data(): esc_count"));
+ }
+
+ num_bits_left = 8 * cnt;
+ while (num_bits_left > 7)
+ {
+ uint8_t ps_extension_id = (uint8_t)faad_getbits(ld, 2
+ DEBUGVAR(1,1013,"ps_data(): ps_extension_size"));
+
+ num_bits_left -= 2;
+ num_bits_left -= ps_extension(ps, ld, ps_extension_id, num_bits_left);
+ }
+
+ faad_getbits(ld, num_bits_left
+ DEBUGVAR(1,1014,"ps_data(): fill_bits"));
+ }
+
+ bits = (uint16_t)faad_get_processed_bits(ld) - bits;
+
+ ps->ps_data_available = 1;
+
+ return bits;
+}
+
+static uint16_t ps_extension(ps_info *ps, bitfile *ld,
+ const uint8_t ps_extension_id,
+ const uint16_t num_bits_left)
+{
+ uint8_t n;
+ uint16_t bits = (uint16_t)faad_get_processed_bits(ld);
+
+ if (ps_extension_id == 0)
+ {
+ ps->enable_ipdopd = (uint8_t)faad_get1bit(ld
+ DEBUGVAR(1,1015,"ps_extension(): enable_ipdopd"));
+
+ if (ps->enable_ipdopd)
+ {
+ for (n = 0; n < ps->num_env; n++)
+ {
+ ps->ipd_dt[n] = (uint8_t)faad_get1bit(ld
+ DEBUGVAR(1,1016,"ps_extension(): ipd_dt"));
+
+ /* ipd_data */
+ huff_data(ld, ps->ipd_dt[n], ps->nr_ipdopd_par, t_huff_ipd,
+ f_huff_ipd, ps->ipd_index[n]);
+
+ ps->opd_dt[n] = (uint8_t)faad_get1bit(ld
+ DEBUGVAR(1,1017,"ps_extension(): opd_dt"));
+
+ /* opd_data */
+ huff_data(ld, ps->opd_dt[n], ps->nr_ipdopd_par, t_huff_opd,
+ f_huff_opd, ps->opd_index[n]);
+ }
+ }
+ faad_get1bit(ld
+ DEBUGVAR(1,1018,"ps_extension(): reserved_ps"));
+ }
+
+ /* return number of bits read */
+ bits = (uint16_t)faad_get_processed_bits(ld) - bits;
+
+ return bits;
+}
+
+/* read huffman data coded in either the frequency or the time direction */
+static void huff_data(bitfile *ld, const uint8_t dt, const uint8_t nr_par,
+ ps_huff_tab t_huff, ps_huff_tab f_huff, int8_t *par)
+{
+ uint8_t n;
+
+ if (dt)
+ {
+ /* coded in time direction */
+ for (n = 0; n < nr_par; n++)
+ {
+ par[n] = ps_huff_dec(ld, t_huff);
+ }
+ } else {
+ /* coded in frequency direction */
+ par[0] = ps_huff_dec(ld, f_huff);
+
+ for (n = 1; n < nr_par; n++)
+ {
+ par[n] = ps_huff_dec(ld, f_huff);
+ }
+ }
+}
+
+/* binary search huffman decoding */
+static INLINE int8_t ps_huff_dec(bitfile *ld, ps_huff_tab t_huff)
+{
+ uint8_t bit;
+ int16_t index = 0;
+
+ while (index >= 0)
+ {
+ bit = (uint8_t)faad_get1bit(ld);
+ index = t_huff[index][bit];
+ }
+
+ return index + 31;
+}
+
+#endif
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