1/* 2 * AC-3 encoder & E-AC-3 encoder common header 3 * Copyright (c) 2000 Fabrice Bellard 4 * Copyright (c) 2006-2010 Justin Ruggles <justin.ruggles@gmail.com> 5 * 6 * This file is part of Libav. 7 * 8 * Libav is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public 10 * License as published by the Free Software Foundation; either 11 * version 2.1 of the License, or (at your option) any later version. 12 * 13 * Libav is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with Libav; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21 */ 22 23/** 24 * @file 25 * AC-3 encoder & E-AC-3 encoder common header 26 */ 27 28#ifndef AVCODEC_AC3ENC_H 29#define AVCODEC_AC3ENC_H 30 31#include <stdint.h> 32#include "ac3.h" 33#include "ac3dsp.h" 34#include "avcodec.h" 35#include "dsputil.h" 36#include "put_bits.h" 37#include "fft.h" 38 39#ifndef CONFIG_AC3ENC_FLOAT 40#define CONFIG_AC3ENC_FLOAT 0 41#endif 42 43#define OFFSET(param) offsetof(AC3EncodeContext, options.param) 44#define AC3ENC_PARAM (AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM) 45 46#define AC3ENC_TYPE_AC3_FIXED 0 47#define AC3ENC_TYPE_AC3 1 48#define AC3ENC_TYPE_EAC3 2 49 50#if CONFIG_AC3ENC_FLOAT 51#define AC3_NAME(x) ff_ac3_float_ ## x 52#define MAC_COEF(d,a,b) ((d)+=(a)*(b)) 53#define COEF_MIN (-16777215.0/16777216.0) 54#define COEF_MAX ( 16777215.0/16777216.0) 55#define NEW_CPL_COORD_THRESHOLD 0.03 56typedef float SampleType; 57typedef float CoefType; 58typedef float CoefSumType; 59#else 60#define AC3_NAME(x) ff_ac3_fixed_ ## x 61#define MAC_COEF(d,a,b) MAC64(d,a,b) 62#define COEF_MIN -16777215 63#define COEF_MAX 16777215 64#define NEW_CPL_COORD_THRESHOLD 503317 65typedef int16_t SampleType; 66typedef int32_t CoefType; 67typedef int64_t CoefSumType; 68#endif 69 70/* common option values */ 71#define AC3ENC_OPT_NONE -1 72#define AC3ENC_OPT_AUTO -1 73#define AC3ENC_OPT_OFF 0 74#define AC3ENC_OPT_ON 1 75#define AC3ENC_OPT_NOT_INDICATED 0 76#define AC3ENC_OPT_MODE_ON 2 77#define AC3ENC_OPT_MODE_OFF 1 78 79/* specific option values */ 80#define AC3ENC_OPT_LARGE_ROOM 1 81#define AC3ENC_OPT_SMALL_ROOM 2 82#define AC3ENC_OPT_DOWNMIX_LTRT 1 83#define AC3ENC_OPT_DOWNMIX_LORO 2 84#define AC3ENC_OPT_ADCONV_STANDARD 0 85#define AC3ENC_OPT_ADCONV_HDCD 1 86 87 88/** 89 * Encoding Options used by AVOption. 90 */ 91typedef struct AC3EncOptions { 92 /* AC-3 metadata options*/ 93 int dialogue_level; 94 int bitstream_mode; 95 float center_mix_level; 96 float surround_mix_level; 97 int dolby_surround_mode; 98 int audio_production_info; 99 int mixing_level; 100 int room_type; 101 int copyright; 102 int original; 103 int extended_bsi_1; 104 int preferred_stereo_downmix; 105 float ltrt_center_mix_level; 106 float ltrt_surround_mix_level; 107 float loro_center_mix_level; 108 float loro_surround_mix_level; 109 int extended_bsi_2; 110 int dolby_surround_ex_mode; 111 int dolby_headphone_mode; 112 int ad_converter_type; 113 int eac3_mixing_metadata; 114 int eac3_info_metadata; 115 116 /* other encoding options */ 117 int allow_per_frame_metadata; 118 int stereo_rematrixing; 119 int channel_coupling; 120 int cpl_start; 121} AC3EncOptions; 122 123/** 124 * Data for a single audio block. 125 */ 126typedef struct AC3Block { 127 CoefType **mdct_coef; ///< MDCT coefficients 128 int32_t **fixed_coef; ///< fixed-point MDCT coefficients 129 uint8_t **exp; ///< original exponents 130 uint8_t **grouped_exp; ///< grouped exponents 131 int16_t **psd; ///< psd per frequency bin 132 int16_t **band_psd; ///< psd per critical band 133 int16_t **mask; ///< masking curve 134 uint16_t **qmant; ///< quantized mantissas 135 uint8_t **cpl_coord_exp; ///< coupling coord exponents (cplcoexp) 136 uint8_t **cpl_coord_mant; ///< coupling coord mantissas (cplcomant) 137 uint8_t coeff_shift[AC3_MAX_CHANNELS]; ///< fixed-point coefficient shift values 138 uint8_t new_rematrixing_strategy; ///< send new rematrixing flags in this block 139 int num_rematrixing_bands; ///< number of rematrixing bands 140 uint8_t rematrixing_flags[4]; ///< rematrixing flags 141 int new_cpl_strategy; ///< send new coupling strategy 142 int cpl_in_use; ///< coupling in use for this block (cplinu) 143 uint8_t channel_in_cpl[AC3_MAX_CHANNELS]; ///< channel in coupling (chincpl) 144 int num_cpl_channels; ///< number of channels in coupling 145 uint8_t new_cpl_coords[AC3_MAX_CHANNELS]; ///< send new coupling coordinates (cplcoe) 146 uint8_t cpl_master_exp[AC3_MAX_CHANNELS]; ///< coupling coord master exponents (mstrcplco) 147 int new_snr_offsets; ///< send new SNR offsets 148 int new_cpl_leak; ///< send new coupling leak info 149 int end_freq[AC3_MAX_CHANNELS]; ///< end frequency bin (endmant) 150} AC3Block; 151 152/** 153 * AC-3 encoder private context. 154 */ 155typedef struct AC3EncodeContext { 156 AVClass *av_class; ///< AVClass used for AVOption 157 AC3EncOptions options; ///< encoding options 158 AVCodecContext *avctx; ///< parent AVCodecContext 159 PutBitContext pb; ///< bitstream writer context 160 DSPContext dsp; 161 AC3DSPContext ac3dsp; ///< AC-3 optimized functions 162 FFTContext mdct; ///< FFT context for MDCT calculation 163 const SampleType *mdct_window; ///< MDCT window function array 164 165 AC3Block blocks[AC3_MAX_BLOCKS]; ///< per-block info 166 167 int fixed_point; ///< indicates if fixed-point encoder is being used 168 int eac3; ///< indicates if this is E-AC-3 vs. AC-3 169 int bitstream_id; ///< bitstream id (bsid) 170 int bitstream_mode; ///< bitstream mode (bsmod) 171 172 int bit_rate; ///< target bit rate, in bits-per-second 173 int sample_rate; ///< sampling frequency, in Hz 174 175 int num_blks_code; ///< number of blocks code (numblkscod) 176 int num_blocks; ///< number of blocks per frame 177 int frame_size_min; ///< minimum frame size in case rounding is necessary 178 int frame_size; ///< current frame size in bytes 179 int frame_size_code; ///< frame size code (frmsizecod) 180 uint16_t crc_inv[2]; 181 int64_t bits_written; ///< bit count (used to avg. bitrate) 182 int64_t samples_written; ///< sample count (used to avg. bitrate) 183 184 int fbw_channels; ///< number of full-bandwidth channels (nfchans) 185 int channels; ///< total number of channels (nchans) 186 int lfe_on; ///< indicates if there is an LFE channel (lfeon) 187 int lfe_channel; ///< channel index of the LFE channel 188 int has_center; ///< indicates if there is a center channel 189 int has_surround; ///< indicates if there are one or more surround channels 190 int channel_mode; ///< channel mode (acmod) 191 const uint8_t *channel_map; ///< channel map used to reorder channels 192 193 int center_mix_level; ///< center mix level code 194 int surround_mix_level; ///< surround mix level code 195 int ltrt_center_mix_level; ///< Lt/Rt center mix level code 196 int ltrt_surround_mix_level; ///< Lt/Rt surround mix level code 197 int loro_center_mix_level; ///< Lo/Ro center mix level code 198 int loro_surround_mix_level; ///< Lo/Ro surround mix level code 199 200 int cutoff; ///< user-specified cutoff frequency, in Hz 201 int bandwidth_code; ///< bandwidth code (0 to 60) (chbwcod) 202 int start_freq[AC3_MAX_CHANNELS]; ///< start frequency bin (strtmant) 203 int cpl_end_freq; ///< coupling channel end frequency bin 204 205 int cpl_on; ///< coupling turned on for this frame 206 int cpl_enabled; ///< coupling enabled for all frames 207 int num_cpl_subbands; ///< number of coupling subbands (ncplsubnd) 208 int num_cpl_bands; ///< number of coupling bands (ncplbnd) 209 uint8_t cpl_band_sizes[AC3_MAX_CPL_BANDS]; ///< number of coeffs in each coupling band 210 211 int rematrixing_enabled; ///< stereo rematrixing enabled 212 213 /* bitrate allocation control */ 214 int slow_gain_code; ///< slow gain code (sgaincod) 215 int slow_decay_code; ///< slow decay code (sdcycod) 216 int fast_decay_code; ///< fast decay code (fdcycod) 217 int db_per_bit_code; ///< dB/bit code (dbpbcod) 218 int floor_code; ///< floor code (floorcod) 219 AC3BitAllocParameters bit_alloc; ///< bit allocation parameters 220 int coarse_snr_offset; ///< coarse SNR offsets (csnroffst) 221 int fast_gain_code[AC3_MAX_CHANNELS]; ///< fast gain codes (signal-to-mask ratio) (fgaincod) 222 int fine_snr_offset[AC3_MAX_CHANNELS]; ///< fine SNR offsets (fsnroffst) 223 int frame_bits_fixed; ///< number of non-coefficient bits for fixed parameters 224 int frame_bits; ///< all frame bits except exponents and mantissas 225 int exponent_bits; ///< number of bits used for exponents 226 227 SampleType *windowed_samples; 228 SampleType **planar_samples; 229 uint8_t *bap_buffer; 230 uint8_t *bap1_buffer; 231 CoefType *mdct_coef_buffer; 232 int32_t *fixed_coef_buffer; 233 uint8_t *exp_buffer; 234 uint8_t *grouped_exp_buffer; 235 int16_t *psd_buffer; 236 int16_t *band_psd_buffer; 237 int16_t *mask_buffer; 238 int16_t *qmant_buffer; 239 uint8_t *cpl_coord_exp_buffer; 240 uint8_t *cpl_coord_mant_buffer; 241 242 uint8_t exp_strategy[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< exponent strategies 243 uint8_t frame_exp_strategy[AC3_MAX_CHANNELS]; ///< frame exp strategy index 244 int use_frame_exp_strategy; ///< indicates use of frame exp strategy 245 uint8_t exp_ref_block[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< reference blocks for EXP_REUSE 246 uint8_t *ref_bap [AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< bit allocation pointers (bap) 247 int ref_bap_set; ///< indicates if ref_bap pointers have been set 248 249 /* fixed vs. float function pointers */ 250 void (*mdct_end)(struct AC3EncodeContext *s); 251 int (*mdct_init)(struct AC3EncodeContext *s); 252 253 /* fixed vs. float templated function pointers */ 254 int (*allocate_sample_buffers)(struct AC3EncodeContext *s); 255 256 /* AC-3 vs. E-AC-3 function pointers */ 257 void (*output_frame_header)(struct AC3EncodeContext *s); 258} AC3EncodeContext; 259 260 261extern const uint64_t ff_ac3_channel_layouts[19]; 262 263int ff_ac3_encode_init(AVCodecContext *avctx); 264 265int ff_ac3_encode_close(AVCodecContext *avctx); 266 267int ff_ac3_validate_metadata(AC3EncodeContext *s); 268 269void ff_ac3_adjust_frame_size(AC3EncodeContext *s); 270 271void ff_ac3_compute_coupling_strategy(AC3EncodeContext *s); 272 273void ff_ac3_apply_rematrixing(AC3EncodeContext *s); 274 275void ff_ac3_process_exponents(AC3EncodeContext *s); 276 277int ff_ac3_compute_bit_allocation(AC3EncodeContext *s); 278 279void ff_ac3_group_exponents(AC3EncodeContext *s); 280 281void ff_ac3_quantize_mantissas(AC3EncodeContext *s); 282 283void ff_ac3_output_frame(AC3EncodeContext *s, unsigned char *frame); 284 285 286/* prototypes for functions in ac3enc_fixed.c and ac3enc_float.c */ 287 288void ff_ac3_fixed_mdct_end(AC3EncodeContext *s); 289void ff_ac3_float_mdct_end(AC3EncodeContext *s); 290 291int ff_ac3_fixed_mdct_init(AC3EncodeContext *s); 292int ff_ac3_float_mdct_init(AC3EncodeContext *s); 293 294 295/* prototypes for functions in ac3enc_template.c */ 296 297int ff_ac3_fixed_allocate_sample_buffers(AC3EncodeContext *s); 298int ff_ac3_float_allocate_sample_buffers(AC3EncodeContext *s); 299 300int ff_ac3_fixed_encode_frame(AVCodecContext *avctx, unsigned char *frame, 301 int buf_size, void *data); 302int ff_ac3_float_encode_frame(AVCodecContext *avctx, unsigned char *frame, 303 int buf_size, void *data); 304 305#endif /* AVCODEC_AC3ENC_H */ 306