Libav
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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 "avcodec.h" 00034 #include "dsputil.h" 00035 #include "fft.h" 00036 #include "mpeg4audio.h" 00037 #include "sbr.h" 00038 00039 #include <stdint.h> 00040 00041 #define MAX_CHANNELS 64 00042 #define MAX_ELEM_ID 16 00043 00044 #define TNS_MAX_ORDER 20 00045 00046 enum RawDataBlockType { 00047 TYPE_SCE, 00048 TYPE_CPE, 00049 TYPE_CCE, 00050 TYPE_LFE, 00051 TYPE_DSE, 00052 TYPE_PCE, 00053 TYPE_FIL, 00054 TYPE_END, 00055 }; 00056 00057 enum ExtensionPayloadID { 00058 EXT_FILL, 00059 EXT_FILL_DATA, 00060 EXT_DATA_ELEMENT, 00061 EXT_DYNAMIC_RANGE = 0xb, 00062 EXT_SBR_DATA = 0xd, 00063 EXT_SBR_DATA_CRC = 0xe, 00064 }; 00065 00066 enum WindowSequence { 00067 ONLY_LONG_SEQUENCE, 00068 LONG_START_SEQUENCE, 00069 EIGHT_SHORT_SEQUENCE, 00070 LONG_STOP_SEQUENCE, 00071 }; 00072 00073 enum BandType { 00074 ZERO_BT = 0, 00075 FIRST_PAIR_BT = 5, 00076 ESC_BT = 11, 00077 NOISE_BT = 13, 00078 INTENSITY_BT2 = 14, 00079 INTENSITY_BT = 15, 00080 }; 00081 00082 #define IS_CODEBOOK_UNSIGNED(x) ((x - 1) & 10) 00083 00084 enum ChannelPosition { 00085 AAC_CHANNEL_FRONT = 1, 00086 AAC_CHANNEL_SIDE = 2, 00087 AAC_CHANNEL_BACK = 3, 00088 AAC_CHANNEL_LFE = 4, 00089 AAC_CHANNEL_CC = 5, 00090 }; 00091 00095 enum CouplingPoint { 00096 BEFORE_TNS, 00097 BETWEEN_TNS_AND_IMDCT, 00098 AFTER_IMDCT = 3, 00099 }; 00100 00104 enum OCStatus { 00105 OC_NONE, //< Output unconfigured 00106 OC_TRIAL_PCE, //< Output configuration under trial specified by an inband PCE 00107 OC_TRIAL_FRAME, //< Output configuration under trial specified by a frame header 00108 OC_GLOBAL_HDR, //< Output configuration set in a global header but not yet locked 00109 OC_LOCKED, //< Output configuration locked in place 00110 }; 00111 00115 typedef struct { 00116 float cor0; 00117 float cor1; 00118 float var0; 00119 float var1; 00120 float r0; 00121 float r1; 00122 } PredictorState; 00123 00124 #define MAX_PREDICTORS 672 00125 00126 #define SCALE_DIV_512 36 ///< scalefactor difference that corresponds to scale difference in 512 times 00127 #define SCALE_ONE_POS 140 ///< scalefactor index that corresponds to scale=1.0 00128 #define SCALE_MAX_POS 255 ///< scalefactor index maximum value 00129 #define SCALE_MAX_DIFF 60 ///< maximum scalefactor difference allowed by standard 00130 #define SCALE_DIFF_ZERO 60 ///< codebook index corresponding to zero scalefactor indices difference 00131 00135 typedef struct { 00136 uint8_t max_sfb; 00137 enum WindowSequence window_sequence[2]; 00138 uint8_t use_kb_window[2]; 00139 int num_window_groups; 00140 uint8_t group_len[8]; 00141 const uint16_t *swb_offset; 00142 const uint8_t *swb_sizes; 00143 int num_swb; 00144 int num_windows; 00145 int tns_max_bands; 00146 int predictor_present; 00147 int predictor_initialized; 00148 int predictor_reset_group; 00149 uint8_t prediction_used[41]; 00150 } IndividualChannelStream; 00151 00155 typedef struct { 00156 int present; 00157 int n_filt[8]; 00158 int length[8][4]; 00159 int direction[8][4]; 00160 int order[8][4]; 00161 float coef[8][4][TNS_MAX_ORDER]; 00162 } TemporalNoiseShaping; 00163 00167 typedef struct { 00168 int pce_instance_tag; 00169 int dyn_rng_sgn[17]; 00170 int dyn_rng_ctl[17]; 00171 int exclude_mask[MAX_CHANNELS]; 00172 int band_incr; 00173 int interpolation_scheme; 00174 int band_top[17]; 00175 int prog_ref_level; 00178 } DynamicRangeControl; 00179 00180 typedef struct { 00181 int num_pulse; 00182 int start; 00183 int pos[4]; 00184 int amp[4]; 00185 } Pulse; 00186 00190 typedef struct { 00191 enum CouplingPoint coupling_point; 00192 int num_coupled; 00193 enum RawDataBlockType type[8]; 00194 int id_select[8]; 00195 int ch_select[8]; 00198 float gain[16][120]; 00199 } ChannelCoupling; 00200 00204 typedef struct { 00205 IndividualChannelStream ics; 00206 TemporalNoiseShaping tns; 00207 Pulse pulse; 00208 enum BandType band_type[128]; 00209 int band_type_run_end[120]; 00210 float sf[120]; 00211 int sf_idx[128]; 00212 uint8_t zeroes[128]; 00213 DECLARE_ALIGNED(16, float, coeffs)[1024]; 00214 DECLARE_ALIGNED(16, float, saved)[1024]; 00215 DECLARE_ALIGNED(16, float, ret)[2048]; 00216 PredictorState predictor_state[MAX_PREDICTORS]; 00217 } SingleChannelElement; 00218 00222 typedef struct { 00223 // CPE specific 00224 int common_window; 00225 int ms_mode; 00226 uint8_t ms_mask[128]; 00227 // shared 00228 SingleChannelElement ch[2]; 00229 // CCE specific 00230 ChannelCoupling coup; 00231 SpectralBandReplication sbr; 00232 } ChannelElement; 00233 00237 typedef struct { 00238 AVCodecContext *avctx; 00239 00240 MPEG4AudioConfig m4ac; 00241 00242 int is_saved; 00243 DynamicRangeControl che_drc; 00244 00249 enum ChannelPosition che_pos[4][MAX_ELEM_ID]; 00252 ChannelElement *che[4][MAX_ELEM_ID]; 00253 ChannelElement *tag_che_map[4][MAX_ELEM_ID]; 00254 uint8_t tags_seen_this_frame[4][MAX_ELEM_ID]; 00255 int tags_mapped; 00262 DECLARE_ALIGNED(16, float, buf_mdct)[1024]; 00269 FFTContext mdct; 00270 FFTContext mdct_small; 00271 DSPContext dsp; 00272 int random_state; 00279 float *output_data[MAX_CHANNELS]; 00280 float add_bias; 00281 float sf_scale; 00282 int sf_offset; 00283 00285 DECLARE_ALIGNED(16, float, temp)[128]; 00286 00287 enum OCStatus output_configured; 00288 } AACContext; 00289 00290 #endif /* AVCODEC_AAC_H */