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libavcodec/aac.h

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00001 /*
00002  * AAC definitions and structures
00003  * Copyright (c) 2005-2006 Oded Shimon ( ods15 ods15 dyndns org )
00004  * Copyright (c) 2006-2007 Maxim Gavrilov ( maxim.gavrilov gmail com )
00005  *
00006  * This file is part of FFmpeg.
00007  *
00008  * FFmpeg is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * FFmpeg is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with FFmpeg; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00030 #ifndef AVCODEC_AAC_H
00031 #define AVCODEC_AAC_H
00032 
00033 #include "libavutil/internal.h"
00034 #include "avcodec.h"
00035 #include "dsputil.h"
00036 #include "mpeg4audio.h"
00037 
00038 #include <stdint.h>
00039 
00040 #define AAC_INIT_VLC_STATIC(num, size) \
00041     INIT_VLC_STATIC(&vlc_spectral[num], 6, ff_aac_spectral_sizes[num], \
00042          ff_aac_spectral_bits[num], sizeof( ff_aac_spectral_bits[num][0]), sizeof( ff_aac_spectral_bits[num][0]), \
00043         ff_aac_spectral_codes[num], sizeof(ff_aac_spectral_codes[num][0]), sizeof(ff_aac_spectral_codes[num][0]), \
00044         size);
00045 
00046 #define MAX_CHANNELS 64
00047 #define MAX_ELEM_ID 16
00048 
00049 #define TNS_MAX_ORDER 20
00050 
00051 enum AudioObjectType {
00052     AOT_NULL,
00053                                // Support?                Name
00054     AOT_AAC_MAIN,              
00055     AOT_AAC_LC,                
00056     AOT_AAC_SSR,               
00057     AOT_AAC_LTP,               
00058     AOT_SBR,                   
00059     AOT_AAC_SCALABLE,          
00060     AOT_TWINVQ,                
00061     AOT_CELP,                  
00062     AOT_HVXC,                  
00063     AOT_TTSI             = 12, 
00064     AOT_MAINSYNTH,             
00065     AOT_WAVESYNTH,             
00066     AOT_MIDI,                  
00067     AOT_SAFX,                  
00068     AOT_ER_AAC_LC,             
00069     AOT_ER_AAC_LTP       = 19, 
00070     AOT_ER_AAC_SCALABLE,       
00071     AOT_ER_TWINVQ,             
00072     AOT_ER_BSAC,               
00073     AOT_ER_AAC_LD,             
00074     AOT_ER_CELP,               
00075     AOT_ER_HVXC,               
00076     AOT_ER_HILN,               
00077     AOT_ER_PARAM,              
00078     AOT_SSC,                   
00079 };
00080 
00081 enum RawDataBlockType {
00082     TYPE_SCE,
00083     TYPE_CPE,
00084     TYPE_CCE,
00085     TYPE_LFE,
00086     TYPE_DSE,
00087     TYPE_PCE,
00088     TYPE_FIL,
00089     TYPE_END,
00090 };
00091 
00092 enum ExtensionPayloadID {
00093     EXT_FILL,
00094     EXT_FILL_DATA,
00095     EXT_DATA_ELEMENT,
00096     EXT_DYNAMIC_RANGE = 0xb,
00097     EXT_SBR_DATA      = 0xd,
00098     EXT_SBR_DATA_CRC  = 0xe,
00099 };
00100 
00101 enum WindowSequence {
00102     ONLY_LONG_SEQUENCE,
00103     LONG_START_SEQUENCE,
00104     EIGHT_SHORT_SEQUENCE,
00105     LONG_STOP_SEQUENCE,
00106 };
00107 
00108 enum BandType {
00109     ZERO_BT        = 0,     
00110     FIRST_PAIR_BT  = 5,     
00111     ESC_BT         = 11,    
00112     NOISE_BT       = 13,    
00113     INTENSITY_BT2  = 14,    
00114     INTENSITY_BT   = 15,    
00115 };
00116 
00117 #define IS_CODEBOOK_UNSIGNED(x) ((x - 1) & 10)
00118 
00119 enum ChannelPosition {
00120     AAC_CHANNEL_FRONT = 1,
00121     AAC_CHANNEL_SIDE  = 2,
00122     AAC_CHANNEL_BACK  = 3,
00123     AAC_CHANNEL_LFE   = 4,
00124     AAC_CHANNEL_CC    = 5,
00125 };
00126 
00130 enum CouplingPoint {
00131     BEFORE_TNS,
00132     BETWEEN_TNS_AND_IMDCT,
00133     AFTER_IMDCT = 3,
00134 };
00135 
00139 typedef struct {
00140     float cor0;
00141     float cor1;
00142     float var0;
00143     float var1;
00144     float r0;
00145     float r1;
00146 } PredictorState;
00147 
00148 #define MAX_PREDICTORS 672
00149 
00153 typedef struct {
00154     uint8_t max_sfb;            
00155     enum WindowSequence window_sequence[2];
00156     uint8_t use_kb_window[2];   
00157     int num_window_groups;
00158     uint8_t group_len[8];
00159     const uint16_t *swb_offset; 
00160     int num_swb;                
00161     int num_windows;
00162     int tns_max_bands;
00163     int predictor_present;
00164     int predictor_initialized;
00165     int predictor_reset_group;
00166     uint8_t prediction_used[41];
00167 } IndividualChannelStream;
00168 
00172 typedef struct {
00173     int present;
00174     int n_filt[8];
00175     int length[8][4];
00176     int direction[8][4];
00177     int order[8][4];
00178     float coef[8][4][TNS_MAX_ORDER];
00179 } TemporalNoiseShaping;
00180 
00184 typedef struct {
00185     int pce_instance_tag;                           
00186     int dyn_rng_sgn[17];                            
00187     int dyn_rng_ctl[17];                            
00188     int exclude_mask[MAX_CHANNELS];                 
00189     int band_incr;                                  
00190     int interpolation_scheme;                       
00191     int band_top[17];                               
00192     int prog_ref_level;                             
00195 } DynamicRangeControl;
00196 
00197 typedef struct {
00198     int num_pulse;
00199     int pos[4];
00200     int amp[4];
00201 } Pulse;
00202 
00206 typedef struct {
00207     enum CouplingPoint coupling_point;  
00208     int num_coupled;       
00209     enum RawDataBlockType type[8];   
00210     int id_select[8];      
00211     int ch_select[8];      
00214     float gain[16][120];
00215 } ChannelCoupling;
00216 
00220 typedef struct {
00221     IndividualChannelStream ics;
00222     TemporalNoiseShaping tns;
00223     enum BandType band_type[120];             
00224     int band_type_run_end[120];               
00225     float sf[120];                            
00226     DECLARE_ALIGNED_16(float, coeffs[1024]);  
00227     DECLARE_ALIGNED_16(float, saved[512]);    
00228     DECLARE_ALIGNED_16(float, ret[1024]);     
00229     PredictorState predictor_state[MAX_PREDICTORS];
00230 } SingleChannelElement;
00231 
00235 typedef struct {
00236     // CPE specific
00237     uint8_t ms_mask[120];     
00238     // shared
00239     SingleChannelElement ch[2];
00240     // CCE specific
00241     ChannelCoupling coup;
00242 } ChannelElement;
00243 
00247 typedef struct {
00248     AVCodecContext * avccontext;
00249 
00250     MPEG4AudioConfig m4ac;
00251 
00252     int is_saved;                 
00253     DynamicRangeControl che_drc;
00254 
00259     enum ChannelPosition che_pos[4][MAX_ELEM_ID]; 
00262     ChannelElement * che[4][MAX_ELEM_ID];
00263     ChannelElement * tag_che_map[4][MAX_ELEM_ID];
00264     int tags_mapped;
00271     DECLARE_ALIGNED_16(float, buf_mdct[1024]);
00278     MDCTContext mdct;
00279     MDCTContext mdct_small;
00280     DSPContext dsp;
00281     int random_state;
00288     float *output_data[MAX_CHANNELS];                 
00289     float add_bias;                                   
00290     float sf_scale;                                   
00291     int sf_offset;                                    
00292 
00294     DECLARE_ALIGNED(16, float, temp[128]);
00295 } AACContext;
00296 
00297 #endif /* AVCODEC_AAC_H */

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