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# ps_dec.h

    00001 /*
    00002 ** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
    00003 ** Copyright (C) 2003-2005 M. Bakker, Ahead Software AG, http://www.nero.com
    00004 **
    00005 ** This program is free software; you can redistribute it and/or modify
    00006 ** it under the terms of the GNU General Public License as published by
    00007 ** the Free Software Foundation; either version 2 of the License, or
    00008 ** (at your option) any later version.
    00009 **
    00010 ** This program is distributed in the hope that it will be useful,
    00011 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
    00012 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00013 ** GNU General Public License for more details.
    00014 **
    00015 ** You should have received a copy of the GNU General Public License
    00016 ** along with this program; if not, write to the Free Software
    00017 ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
    00018 **
    00019 ** Any non-GPL usage of this software or parts of this software is strictly
    00020 ** forbidden.
    00021 **
    00022 ** Software using this code must display the following message visibly in the
    00023 ** software:
    00024 ** "FAAD2 AAC/HE-AAC/HE-AACv2/DRM decoder (c) Ahead Software, www.nero.com"
    00025 ** in, for example, the about-box or help/startup screen.
    00026 **
    00027 ** Commercial non-GPL licensing of this software is possible.
    00028 ** For more info contact Ahead Software through Mpeg4AAClicense@nero.com.
    00029 **
    00030 ** $Id: ps_dec.h,v 1.2 2005/11/01 21:41:43 gabest Exp $
    00031 **/
    00032
    00033 #ifndef __PS_DEC_H__
    00034 #define __PS_DEC_H__
    00035
    00036 #ifdef __cplusplus
    00037 extern "C" {
    00038 #endif
    00039
    00040 #include "bits.h"
    00041
    00042 #define EXTENSION_ID_PS 2
    00043
    00044 #define MAX_PS_ENVELOPES 5
    00045 #define NO_ALLPASS_LINKS 3
    00046
    00047 typedef struct
    00048 {
    00049     /* bitstream parameters */
    00050     uint8_t enable_iid;
    00051     uint8_t enable_icc;
    00052     uint8_t enable_ext;
    00053
    00054     uint8_t iid_mode;
    00055     uint8_t icc_mode;
    00056     uint8_t nr_iid_par;
    00057     uint8_t nr_ipdopd_par;
    00058     uint8_t nr_icc_par;
    00059
    00060     uint8_t frame_class;
    00061     uint8_t num_env;
    00062
    00063     uint8_t border_position[MAX_PS_ENVELOPES+1];
    00064
    00065     uint8_t iid_dt[MAX_PS_ENVELOPES];
    00066     uint8_t icc_dt[MAX_PS_ENVELOPES];
    00067
    00068     uint8_t enable_ipdopd;
    00069     uint8_t ipd_mode;
    00070     uint8_t ipd_dt[MAX_PS_ENVELOPES];
    00071     uint8_t opd_dt[MAX_PS_ENVELOPES];
    00072
    00073     /* indices */
    00074     int8_t iid_index_prev[34];
    00075     int8_t icc_index_prev[34];
    00076     int8_t ipd_index_prev[17];
    00077     int8_t opd_index_prev[17];
    00078     int8_t iid_index[MAX_PS_ENVELOPES][34];
    00079     int8_t icc_index[MAX_PS_ENVELOPES][34];
    00080     int8_t ipd_index[MAX_PS_ENVELOPES][17];
    00081     int8_t opd_index[MAX_PS_ENVELOPES][17];
    00082
    00083     int8_t ipd_index_1[17];
    00084     int8_t opd_index_1[17];
    00085     int8_t ipd_index_2[17];
    00086     int8_t opd_index_2[17];
    00087
    00088     /* ps data was correctly read */
    00089     uint8_t ps_data_available;
    00090
    00091     /* a header has been read */
    00092     uint8_t header_read;
    00093
    00094     /* hybrid filterbank parameters */
    00095     void *hyb;
    00096     uint8_t use34hybrid_bands;
    00097
    00098
    00099     uint8_t num_groups;
    00100     uint8_t num_hybrid_groups;
    00101     uint8_t nr_par_bands;
    00102     uint8_t nr_allpass_bands;
    00103     uint8_t decay_cutoff;
    00104
    00105     uint8_t *group_border;
    00106     uint16_t *map_group2bk;
    00107
    00108     /* filter delay handling */
    00109     uint8_t saved_delay;
    00110     uint8_t delay_buf_index_ser[NO_ALLPASS_LINKS];
    00111     uint8_t num_sample_delay_ser[NO_ALLPASS_LINKS];
    00112     uint8_t delay_D[64];
    00113     uint8_t delay_buf_index_delay[64];
    00114
    00115     complex_t delay_Qmf[14][64]; /* 14 samples delay max, 64 QMF channels */
    00116     complex_t delay_SubQmf[2][32]; /* 2 samples delay max (SubQmf is always allpass filtered) */
    00117     complex_t delay_Qmf_ser[NO_ALLPASS_LINKS][5][64]; /* 5 samples delay max (table 8.34), 64 QMF channels */
    00118     complex_t delay_SubQmf_ser[NO_ALLPASS_LINKS][5][32]; /* 5 samples delay max (table 8.34) */
    00119
    00120     /* transients */
    00121     real_t alpha_decay;
    00122     real_t alpha_smooth;
    00123
    00124     real_t P_PeakDecayNrg[34];
    00125     real_t P_prev[34];
    00126     real_t P_SmoothPeakDecayDiffNrg_prev[34];
    00127
    00128     /* mixing and phase */
    00129     complex_t h11_prev[50];
    00130     complex_t h12_prev[50];
    00131     complex_t h21_prev[50];
    00132     complex_t h22_prev[50];
    00133     uint8_t phase_hist;
    00134     complex_t ipd_prev[20][2];
    00135     complex_t opd_prev[20][2];
    00136
    00137 } ps_info;
    00138
    00139 /* ps_syntax.c */
    00140 uint16_t ps_data(ps_info *ps, bitfile *ld, uint8_t *header);
    00141
    00142 /* ps_dec.c */
    00143 ps_info *ps_init(uint8_t sr_index);
    00144 void ps_free(ps_info *ps);
    00145
    00146 uint8_t ps_decode(ps_info *ps, qmf_t X_left[38][64], qmf_t X_right[38][64]);
    00147
    00148
    00149 #ifdef __cplusplus
    00150 }
    00151 #endif
    00152 #endif
    00153