Libav 0.7.1
|
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 Libav. 00007 * 00008 * Libav 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 * Libav 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 Libav; 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 "avcodec.h" 00034 #include "dsputil.h" 00035 #include "fft.h" 00036 #include "mpeg4audio.h" 00037 #include "sbr.h" 00038 #include "fmtconvert.h" 00039 00040 #include <stdint.h> 00041 00042 #define MAX_CHANNELS 64 00043 #define MAX_ELEM_ID 16 00044 00045 #define TNS_MAX_ORDER 20 00046 #define MAX_LTP_LONG_SFB 40 00047 00048 enum RawDataBlockType { 00049 TYPE_SCE, 00050 TYPE_CPE, 00051 TYPE_CCE, 00052 TYPE_LFE, 00053 TYPE_DSE, 00054 TYPE_PCE, 00055 TYPE_FIL, 00056 TYPE_END, 00057 }; 00058 00059 enum ExtensionPayloadID { 00060 EXT_FILL, 00061 EXT_FILL_DATA, 00062 EXT_DATA_ELEMENT, 00063 EXT_DYNAMIC_RANGE = 0xb, 00064 EXT_SBR_DATA = 0xd, 00065 EXT_SBR_DATA_CRC = 0xe, 00066 }; 00067 00068 enum WindowSequence { 00069 ONLY_LONG_SEQUENCE, 00070 LONG_START_SEQUENCE, 00071 EIGHT_SHORT_SEQUENCE, 00072 LONG_STOP_SEQUENCE, 00073 }; 00074 00075 enum BandType { 00076 ZERO_BT = 0, 00077 FIRST_PAIR_BT = 5, 00078 ESC_BT = 11, 00079 NOISE_BT = 13, 00080 INTENSITY_BT2 = 14, 00081 INTENSITY_BT = 15, 00082 }; 00083 00084 #define IS_CODEBOOK_UNSIGNED(x) ((x - 1) & 10) 00085 00086 enum ChannelPosition { 00087 AAC_CHANNEL_FRONT = 1, 00088 AAC_CHANNEL_SIDE = 2, 00089 AAC_CHANNEL_BACK = 3, 00090 AAC_CHANNEL_LFE = 4, 00091 AAC_CHANNEL_CC = 5, 00092 }; 00093 00097 enum CouplingPoint { 00098 BEFORE_TNS, 00099 BETWEEN_TNS_AND_IMDCT, 00100 AFTER_IMDCT = 3, 00101 }; 00102 00106 enum OCStatus { 00107 OC_NONE, //< Output unconfigured 00108 OC_TRIAL_PCE, //< Output configuration under trial specified by an inband PCE 00109 OC_TRIAL_FRAME, //< Output configuration under trial specified by a frame header 00110 OC_GLOBAL_HDR, //< Output configuration set in a global header but not yet locked 00111 OC_LOCKED, //< Output configuration locked in place 00112 }; 00113 00117 typedef struct { 00118 float cor0; 00119 float cor1; 00120 float var0; 00121 float var1; 00122 float r0; 00123 float r1; 00124 } PredictorState; 00125 00126 #define MAX_PREDICTORS 672 00127 00128 #define SCALE_DIV_512 36 ///< scalefactor difference that corresponds to scale difference in 512 times 00129 #define SCALE_ONE_POS 140 ///< scalefactor index that corresponds to scale=1.0 00130 #define SCALE_MAX_POS 255 ///< scalefactor index maximum value 00131 #define SCALE_MAX_DIFF 60 ///< maximum scalefactor difference allowed by standard 00132 #define SCALE_DIFF_ZERO 60 ///< codebook index corresponding to zero scalefactor indices difference 00133 #define POW_SF2_ZERO 200 ///< ff_aac_pow2sf_tab index corresponding to pow(2, 0); 00134 00138 typedef struct { 00139 int8_t present; 00140 int16_t lag; 00141 float coef; 00142 int8_t used[MAX_LTP_LONG_SFB]; 00143 } LongTermPrediction; 00144 00148 typedef struct { 00149 uint8_t max_sfb; 00150 enum WindowSequence window_sequence[2]; 00151 uint8_t use_kb_window[2]; 00152 int num_window_groups; 00153 uint8_t group_len[8]; 00154 LongTermPrediction ltp; 00155 const uint16_t *swb_offset; 00156 const uint8_t *swb_sizes; 00157 int num_swb; 00158 int num_windows; 00159 int tns_max_bands; 00160 int predictor_present; 00161 int predictor_initialized; 00162 int predictor_reset_group; 00163 uint8_t prediction_used[41]; 00164 } IndividualChannelStream; 00165 00169 typedef struct { 00170 int present; 00171 int n_filt[8]; 00172 int length[8][4]; 00173 int direction[8][4]; 00174 int order[8][4]; 00175 float coef[8][4][TNS_MAX_ORDER]; 00176 } TemporalNoiseShaping; 00177 00181 typedef struct { 00182 int pce_instance_tag; 00183 int dyn_rng_sgn[17]; 00184 int dyn_rng_ctl[17]; 00185 int exclude_mask[MAX_CHANNELS]; 00186 int band_incr; 00187 int interpolation_scheme; 00188 int band_top[17]; 00189 int prog_ref_level; 00192 } DynamicRangeControl; 00193 00194 typedef struct { 00195 int num_pulse; 00196 int start; 00197 int pos[4]; 00198 int amp[4]; 00199 } Pulse; 00200 00204 typedef struct { 00205 enum CouplingPoint coupling_point; 00206 int num_coupled; 00207 enum RawDataBlockType type[8]; 00208 int id_select[8]; 00209 int ch_select[8]; 00212 float gain[16][120]; 00213 } ChannelCoupling; 00214 00218 typedef struct { 00219 IndividualChannelStream ics; 00220 TemporalNoiseShaping tns; 00221 Pulse pulse; 00222 enum BandType band_type[128]; 00223 int band_type_run_end[120]; 00224 float sf[120]; 00225 int sf_idx[128]; 00226 uint8_t zeroes[128]; 00227 DECLARE_ALIGNED(32, float, coeffs)[1024]; 00228 DECLARE_ALIGNED(32, float, saved)[1024]; 00229 DECLARE_ALIGNED(32, float, ret)[2048]; 00230 DECLARE_ALIGNED(16, float, ltp_state)[3072]; 00231 PredictorState predictor_state[MAX_PREDICTORS]; 00232 } SingleChannelElement; 00233 00237 typedef struct { 00238 // CPE specific 00239 int common_window; 00240 int ms_mode; 00241 uint8_t ms_mask[128]; 00242 // shared 00243 SingleChannelElement ch[2]; 00244 // CCE specific 00245 ChannelCoupling coup; 00246 SpectralBandReplication sbr; 00247 } ChannelElement; 00248 00252 typedef struct { 00253 AVCodecContext *avctx; 00254 00255 MPEG4AudioConfig m4ac; 00256 00257 int is_saved; 00258 DynamicRangeControl che_drc; 00259 00264 enum ChannelPosition che_pos[4][MAX_ELEM_ID]; 00267 ChannelElement *che[4][MAX_ELEM_ID]; 00268 ChannelElement *tag_che_map[4][MAX_ELEM_ID]; 00269 int tags_mapped; 00277 DECLARE_ALIGNED(32, float, buf_mdct)[1024]; 00284 FFTContext mdct; 00285 FFTContext mdct_small; 00286 FFTContext mdct_ltp; 00287 DSPContext dsp; 00288 FmtConvertContext fmt_conv; 00289 int random_state; 00296 float *output_data[MAX_CHANNELS]; 00297 00299 DECLARE_ALIGNED(32, float, temp)[128]; 00300 00301 enum OCStatus output_configured; 00302 } AACContext; 00303 00304 #endif /* AVCODEC_AAC_H */