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 FFmpeg. 7 * 8 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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 33#include "libavutil/float_dsp.h" 34 35#include "ac3.h" 36#include "ac3dsp.h" 37#include "avcodec.h" 38#include "dsputil.h" 39#include "fft.h" 40#include "mathops.h" 41#include "put_bits.h" 42#include "audiodsp.h" 43 44#ifndef CONFIG_AC3ENC_FLOAT 45#define CONFIG_AC3ENC_FLOAT 0 46#endif 47 48#define OFFSET(param) offsetof(AC3EncodeContext, options.param) 49#define AC3ENC_PARAM (AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM) 50 51#define AC3ENC_TYPE_AC3_FIXED 0 52#define AC3ENC_TYPE_AC3 1 53#define AC3ENC_TYPE_EAC3 2 54 55#if CONFIG_AC3ENC_FLOAT 56#define AC3_NAME(x) ff_ac3_float_ ## x 57#define MAC_COEF(d,a,b) ((d)+=(a)*(b)) 58#define COEF_MIN (-16777215.0/16777216.0) 59#define COEF_MAX ( 16777215.0/16777216.0) 60#define NEW_CPL_COORD_THRESHOLD 0.03 61typedef float SampleType; 62typedef float CoefType; 63typedef float CoefSumType; 64#else 65#define AC3_NAME(x) ff_ac3_fixed_ ## x 66#define MAC_COEF(d,a,b) MAC64(d,a,b) 67#define COEF_MIN -16777215 68#define COEF_MAX 16777215 69#define NEW_CPL_COORD_THRESHOLD 503317 70typedef int16_t SampleType; 71typedef int32_t CoefType; 72typedef int64_t CoefSumType; 73#endif 74 75/* common option values */ 76#define AC3ENC_OPT_NONE -1 77#define AC3ENC_OPT_AUTO -1 78#define AC3ENC_OPT_OFF 0 79#define AC3ENC_OPT_ON 1 80#define AC3ENC_OPT_NOT_INDICATED 0 81#define AC3ENC_OPT_MODE_ON 2 82#define AC3ENC_OPT_MODE_OFF 1 83 84/* specific option values */ 85#define AC3ENC_OPT_LARGE_ROOM 1 86#define AC3ENC_OPT_SMALL_ROOM 2 87#define AC3ENC_OPT_DOWNMIX_LTRT 1 88#define AC3ENC_OPT_DOWNMIX_LORO 2 89#define AC3ENC_OPT_ADCONV_STANDARD 0 90#define AC3ENC_OPT_ADCONV_HDCD 1 91 92 93/** 94 * Encoding Options used by AVOption. 95 */ 96typedef struct AC3EncOptions { 97 /* AC-3 metadata options*/ 98 int dialogue_level; 99 int bitstream_mode; 100 float center_mix_level; 101 float surround_mix_level; 102 int dolby_surround_mode; 103 int audio_production_info; 104 int mixing_level; 105 int room_type; 106 int copyright; 107 int original; 108 int extended_bsi_1; 109 int preferred_stereo_downmix; 110 float ltrt_center_mix_level; 111 float ltrt_surround_mix_level; 112 float loro_center_mix_level; 113 float loro_surround_mix_level; 114 int extended_bsi_2; 115 int dolby_surround_ex_mode; 116 int dolby_headphone_mode; 117 int ad_converter_type; 118 int eac3_mixing_metadata; 119 int eac3_info_metadata; 120 121 /* other encoding options */ 122 int allow_per_frame_metadata; 123 int stereo_rematrixing; 124 int channel_coupling; 125 int cpl_start; 126} AC3EncOptions; 127 128/** 129 * Data for a single audio block. 130 */ 131typedef struct AC3Block { 132 CoefType **mdct_coef; ///< MDCT coefficients 133 int32_t **fixed_coef; ///< fixed-point MDCT coefficients 134 uint8_t **exp; ///< original exponents 135 uint8_t **grouped_exp; ///< grouped exponents 136 int16_t **psd; ///< psd per frequency bin 137 int16_t **band_psd; ///< psd per critical band 138 int16_t **mask; ///< masking curve 139 uint16_t **qmant; ///< quantized mantissas 140 uint8_t **cpl_coord_exp; ///< coupling coord exponents (cplcoexp) 141 uint8_t **cpl_coord_mant; ///< coupling coord mantissas (cplcomant) 142 uint8_t coeff_shift[AC3_MAX_CHANNELS]; ///< fixed-point coefficient shift values 143 uint8_t new_rematrixing_strategy; ///< send new rematrixing flags in this block 144 int num_rematrixing_bands; ///< number of rematrixing bands 145 uint8_t rematrixing_flags[4]; ///< rematrixing flags 146 int new_cpl_strategy; ///< send new coupling strategy 147 int cpl_in_use; ///< coupling in use for this block (cplinu) 148 uint8_t channel_in_cpl[AC3_MAX_CHANNELS]; ///< channel in coupling (chincpl) 149 int num_cpl_channels; ///< number of channels in coupling 150 uint8_t new_cpl_coords[AC3_MAX_CHANNELS]; ///< send new coupling coordinates (cplcoe) 151 uint8_t cpl_master_exp[AC3_MAX_CHANNELS]; ///< coupling coord master exponents (mstrcplco) 152 int new_snr_offsets; ///< send new SNR offsets 153 int new_cpl_leak; ///< send new coupling leak info 154 int end_freq[AC3_MAX_CHANNELS]; ///< end frequency bin (endmant) 155} AC3Block; 156 157/** 158 * AC-3 encoder private context. 159 */ 160typedef struct AC3EncodeContext { 161 AVClass *av_class; ///< AVClass used for AVOption 162 AC3EncOptions options; ///< encoding options 163 AVCodecContext *avctx; ///< parent AVCodecContext 164 PutBitContext pb; ///< bitstream writer context 165 DSPContext dsp; 166 AudioDSPContext adsp; 167 AVFloatDSPContext fdsp; 168 AC3DSPContext ac3dsp; ///< AC-3 optimized functions 169 FFTContext mdct; ///< FFT context for MDCT calculation 170 const SampleType *mdct_window; ///< MDCT window function array 171 172 AC3Block blocks[AC3_MAX_BLOCKS]; ///< per-block info 173 174 int fixed_point; ///< indicates if fixed-point encoder is being used 175 int eac3; ///< indicates if this is E-AC-3 vs. AC-3 176 int bitstream_id; ///< bitstream id (bsid) 177 int bitstream_mode; ///< bitstream mode (bsmod) 178 179 int bit_rate; ///< target bit rate, in bits-per-second 180 int sample_rate; ///< sampling frequency, in Hz 181 182 int num_blks_code; ///< number of blocks code (numblkscod) 183 int num_blocks; ///< number of blocks per frame 184 int frame_size_min; ///< minimum frame size in case rounding is necessary 185 int frame_size; ///< current frame size in bytes 186 int frame_size_code; ///< frame size code (frmsizecod) 187 uint16_t crc_inv[2]; 188 int64_t bits_written; ///< bit count (used to avg. bitrate) 189 int64_t samples_written; ///< sample count (used to avg. bitrate) 190 191 int fbw_channels; ///< number of full-bandwidth channels (nfchans) 192 int channels; ///< total number of channels (nchans) 193 int lfe_on; ///< indicates if there is an LFE channel (lfeon) 194 int lfe_channel; ///< channel index of the LFE channel 195 int has_center; ///< indicates if there is a center channel 196 int has_surround; ///< indicates if there are one or more surround channels 197 int channel_mode; ///< channel mode (acmod) 198 const uint8_t *channel_map; ///< channel map used to reorder channels 199 200 int center_mix_level; ///< center mix level code 201 int surround_mix_level; ///< surround mix level code 202 int ltrt_center_mix_level; ///< Lt/Rt center mix level code 203 int ltrt_surround_mix_level; ///< Lt/Rt surround mix level code 204 int loro_center_mix_level; ///< Lo/Ro center mix level code 205 int loro_surround_mix_level; ///< Lo/Ro surround mix level code 206 207 int cutoff; ///< user-specified cutoff frequency, in Hz 208 int bandwidth_code; ///< bandwidth code (0 to 60) (chbwcod) 209 int start_freq[AC3_MAX_CHANNELS]; ///< start frequency bin (strtmant) 210 int cpl_end_freq; ///< coupling channel end frequency bin 211 212 int cpl_on; ///< coupling turned on for this frame 213 int cpl_enabled; ///< coupling enabled for all frames 214 int num_cpl_subbands; ///< number of coupling subbands (ncplsubnd) 215 int num_cpl_bands; ///< number of coupling bands (ncplbnd) 216 uint8_t cpl_band_sizes[AC3_MAX_CPL_BANDS]; ///< number of coeffs in each coupling band 217 218 int rematrixing_enabled; ///< stereo rematrixing enabled 219 220 /* bitrate allocation control */ 221 int slow_gain_code; ///< slow gain code (sgaincod) 222 int slow_decay_code; ///< slow decay code (sdcycod) 223 int fast_decay_code; ///< fast decay code (fdcycod) 224 int db_per_bit_code; ///< dB/bit code (dbpbcod) 225 int floor_code; ///< floor code (floorcod) 226 AC3BitAllocParameters bit_alloc; ///< bit allocation parameters 227 int coarse_snr_offset; ///< coarse SNR offsets (csnroffst) 228 int fast_gain_code[AC3_MAX_CHANNELS]; ///< fast gain codes (signal-to-mask ratio) (fgaincod) 229 int fine_snr_offset[AC3_MAX_CHANNELS]; ///< fine SNR offsets (fsnroffst) 230 int frame_bits_fixed; ///< number of non-coefficient bits for fixed parameters 231 int frame_bits; ///< all frame bits except exponents and mantissas 232 int exponent_bits; ///< number of bits used for exponents 233 234 SampleType *windowed_samples; 235 SampleType **planar_samples; 236 uint8_t *bap_buffer; 237 uint8_t *bap1_buffer; 238 CoefType *mdct_coef_buffer; 239 int32_t *fixed_coef_buffer; 240 uint8_t *exp_buffer; 241 uint8_t *grouped_exp_buffer; 242 int16_t *psd_buffer; 243 int16_t *band_psd_buffer; 244 int16_t *mask_buffer; 245 int16_t *qmant_buffer; 246 uint8_t *cpl_coord_exp_buffer; 247 uint8_t *cpl_coord_mant_buffer; 248 249 uint8_t exp_strategy[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< exponent strategies 250 uint8_t frame_exp_strategy[AC3_MAX_CHANNELS]; ///< frame exp strategy index 251 int use_frame_exp_strategy; ///< indicates use of frame exp strategy 252 uint8_t exp_ref_block[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< reference blocks for EXP_REUSE 253 uint8_t *ref_bap [AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< bit allocation pointers (bap) 254 int ref_bap_set; ///< indicates if ref_bap pointers have been set 255 256 /* fixed vs. float function pointers */ 257 void (*mdct_end)(struct AC3EncodeContext *s); 258 int (*mdct_init)(struct AC3EncodeContext *s); 259 260 /* fixed vs. float templated function pointers */ 261 int (*allocate_sample_buffers)(struct AC3EncodeContext *s); 262 263 /* AC-3 vs. E-AC-3 function pointers */ 264 void (*output_frame_header)(struct AC3EncodeContext *s); 265} AC3EncodeContext; 266 267 268extern const uint64_t ff_ac3_channel_layouts[19]; 269 270int ff_ac3_encode_init(AVCodecContext *avctx); 271int ff_ac3_float_encode_init(AVCodecContext *avctx); 272 273int ff_ac3_encode_close(AVCodecContext *avctx); 274 275int ff_ac3_validate_metadata(AC3EncodeContext *s); 276 277void ff_ac3_adjust_frame_size(AC3EncodeContext *s); 278 279void ff_ac3_compute_coupling_strategy(AC3EncodeContext *s); 280 281void ff_ac3_apply_rematrixing(AC3EncodeContext *s); 282 283void ff_ac3_process_exponents(AC3EncodeContext *s); 284 285int ff_ac3_compute_bit_allocation(AC3EncodeContext *s); 286 287void ff_ac3_group_exponents(AC3EncodeContext *s); 288 289void ff_ac3_quantize_mantissas(AC3EncodeContext *s); 290 291void ff_ac3_output_frame(AC3EncodeContext *s, unsigned char *frame); 292 293 294/* prototypes for functions in ac3enc_fixed.c and ac3enc_float.c */ 295 296void ff_ac3_fixed_mdct_end(AC3EncodeContext *s); 297void ff_ac3_float_mdct_end(AC3EncodeContext *s); 298 299int ff_ac3_fixed_mdct_init(AC3EncodeContext *s); 300int ff_ac3_float_mdct_init(AC3EncodeContext *s); 301 302 303/* prototypes for functions in ac3enc_template.c */ 304 305int ff_ac3_fixed_allocate_sample_buffers(AC3EncodeContext *s); 306int ff_ac3_float_allocate_sample_buffers(AC3EncodeContext *s); 307 308int ff_ac3_fixed_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, 309 const AVFrame *frame, int *got_packet_ptr); 310int ff_ac3_float_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, 311 const AVFrame *frame, int *got_packet_ptr); 312 313#endif /* AVCODEC_AC3ENC_H */ 314