/* * AC-3 encoder & E-AC-3 encoder common header * Copyright (c) 2000 Fabrice Bellard * Copyright (c) 2006-2010 Justin Ruggles <justin.ruggles@gmail.com> * * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * AC-3 encoder & E-AC-3 encoder common header */ #ifndef AVCODEC_AC3ENC_H #define AVCODEC_AC3ENC_H #include <stdint.h> #include "libavutil/float_dsp.h" #include "ac3.h" #include "ac3dsp.h" #include "avcodec.h" #include "dsputil.h" #include "put_bits.h" #include "fft.h" #ifndef CONFIG_AC3ENC_FLOAT #define CONFIG_AC3ENC_FLOAT 0 #endif #define OFFSET(param) offsetof(AC3EncodeContext, options.param) #define AC3ENC_PARAM (AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM) #define AC3ENC_TYPE_AC3_FIXED 0 #define AC3ENC_TYPE_AC3 1 #define AC3ENC_TYPE_EAC3 2 #if CONFIG_AC3ENC_FLOAT #define AC3_NAME(x) ff_ac3_float_ ## x #define MAC_COEF(d,a,b) ((d)+=(a)*(b)) #define COEF_MIN (-16777215.0/16777216.0) #define COEF_MAX ( 16777215.0/16777216.0) #define NEW_CPL_COORD_THRESHOLD 0.03 typedef float SampleType; typedef float CoefType; typedef float CoefSumType; #else #define AC3_NAME(x) ff_ac3_fixed_ ## x #define MAC_COEF(d,a,b) MAC64(d,a,b) #define COEF_MIN -16777215 #define COEF_MAX 16777215 #define NEW_CPL_COORD_THRESHOLD 503317 typedef int16_t SampleType; typedef int32_t CoefType; typedef int64_t CoefSumType; #endif /* common option values */ #define AC3ENC_OPT_NONE -1 #define AC3ENC_OPT_AUTO -1 #define AC3ENC_OPT_OFF 0 #define AC3ENC_OPT_ON 1 #define AC3ENC_OPT_NOT_INDICATED 0 #define AC3ENC_OPT_MODE_ON 2 #define AC3ENC_OPT_MODE_OFF 1 /* specific option values */ #define AC3ENC_OPT_LARGE_ROOM 1 #define AC3ENC_OPT_SMALL_ROOM 2 #define AC3ENC_OPT_DOWNMIX_LTRT 1 #define AC3ENC_OPT_DOWNMIX_LORO 2 #define AC3ENC_OPT_ADCONV_STANDARD 0 #define AC3ENC_OPT_ADCONV_HDCD 1 /** * Encoding Options used by AVOption. */ typedef struct AC3EncOptions { /* AC-3 metadata options*/ int dialogue_level; int bitstream_mode; float center_mix_level; float surround_mix_level; int dolby_surround_mode; int audio_production_info; int mixing_level; int room_type; int copyright; int original; int extended_bsi_1; int preferred_stereo_downmix; float ltrt_center_mix_level; float ltrt_surround_mix_level; float loro_center_mix_level; float loro_surround_mix_level; int extended_bsi_2; int dolby_surround_ex_mode; int dolby_headphone_mode; int ad_converter_type; int eac3_mixing_metadata; int eac3_info_metadata; /* other encoding options */ int allow_per_frame_metadata; int stereo_rematrixing; int channel_coupling; int cpl_start; } AC3EncOptions; /** * Data for a single audio block. */ typedef struct AC3Block { CoefType **mdct_coef; ///< MDCT coefficients int32_t **fixed_coef; ///< fixed-point MDCT coefficients uint8_t **exp; ///< original exponents uint8_t **grouped_exp; ///< grouped exponents int16_t **psd; ///< psd per frequency bin int16_t **band_psd; ///< psd per critical band int16_t **mask; ///< masking curve uint16_t **qmant; ///< quantized mantissas uint8_t **cpl_coord_exp; ///< coupling coord exponents (cplcoexp) uint8_t **cpl_coord_mant; ///< coupling coord mantissas (cplcomant) uint8_t coeff_shift[AC3_MAX_CHANNELS]; ///< fixed-point coefficient shift values uint8_t new_rematrixing_strategy; ///< send new rematrixing flags in this block int num_rematrixing_bands; ///< number of rematrixing bands uint8_t rematrixing_flags[4]; ///< rematrixing flags int new_cpl_strategy; ///< send new coupling strategy int cpl_in_use; ///< coupling in use for this block (cplinu) uint8_t channel_in_cpl[AC3_MAX_CHANNELS]; ///< channel in coupling (chincpl) int num_cpl_channels; ///< number of channels in coupling uint8_t new_cpl_coords[AC3_MAX_CHANNELS]; ///< send new coupling coordinates (cplcoe) uint8_t cpl_master_exp[AC3_MAX_CHANNELS]; ///< coupling coord master exponents (mstrcplco) int new_snr_offsets; ///< send new SNR offsets int new_cpl_leak; ///< send new coupling leak info int end_freq[AC3_MAX_CHANNELS]; ///< end frequency bin (endmant) } AC3Block; /** * AC-3 encoder private context. */ typedef struct AC3EncodeContext { AVClass *av_class; ///< AVClass used for AVOption AC3EncOptions options; ///< encoding options AVCodecContext *avctx; ///< parent AVCodecContext PutBitContext pb; ///< bitstream writer context DSPContext dsp; AVFloatDSPContext fdsp; AC3DSPContext ac3dsp; ///< AC-3 optimized functions FFTContext mdct; ///< FFT context for MDCT calculation const SampleType *mdct_window; ///< MDCT window function array AC3Block blocks[AC3_MAX_BLOCKS]; ///< per-block info int fixed_point; ///< indicates if fixed-point encoder is being used int eac3; ///< indicates if this is E-AC-3 vs. AC-3 int bitstream_id; ///< bitstream id (bsid) int bitstream_mode; ///< bitstream mode (bsmod) int bit_rate; ///< target bit rate, in bits-per-second int sample_rate; ///< sampling frequency, in Hz int num_blks_code; ///< number of blocks code (numblkscod) int num_blocks; ///< number of blocks per frame int frame_size_min; ///< minimum frame size in case rounding is necessary int frame_size; ///< current frame size in bytes int frame_size_code; ///< frame size code (frmsizecod) uint16_t crc_inv[2]; int64_t bits_written; ///< bit count (used to avg. bitrate) int64_t samples_written; ///< sample count (used to avg. bitrate) int fbw_channels; ///< number of full-bandwidth channels (nfchans) int channels; ///< total number of channels (nchans) int lfe_on; ///< indicates if there is an LFE channel (lfeon) int lfe_channel; ///< channel index of the LFE channel int has_center; ///< indicates if there is a center channel int has_surround; ///< indicates if there are one or more surround channels int channel_mode; ///< channel mode (acmod) const uint8_t *channel_map; ///< channel map used to reorder channels int center_mix_level; ///< center mix level code int surround_mix_level; ///< surround mix level code int ltrt_center_mix_level; ///< Lt/Rt center mix level code int ltrt_surround_mix_level; ///< Lt/Rt surround mix level code int loro_center_mix_level; ///< Lo/Ro center mix level code int loro_surround_mix_level; ///< Lo/Ro surround mix level code int cutoff; ///< user-specified cutoff frequency, in Hz int bandwidth_code; ///< bandwidth code (0 to 60) (chbwcod) int start_freq[AC3_MAX_CHANNELS]; ///< start frequency bin (strtmant) int cpl_end_freq; ///< coupling channel end frequency bin int cpl_on; ///< coupling turned on for this frame int cpl_enabled; ///< coupling enabled for all frames int num_cpl_subbands; ///< number of coupling subbands (ncplsubnd) int num_cpl_bands; ///< number of coupling bands (ncplbnd) uint8_t cpl_band_sizes[AC3_MAX_CPL_BANDS]; ///< number of coeffs in each coupling band int rematrixing_enabled; ///< stereo rematrixing enabled /* bitrate allocation control */ int slow_gain_code; ///< slow gain code (sgaincod) int slow_decay_code; ///< slow decay code (sdcycod) int fast_decay_code; ///< fast decay code (fdcycod) int db_per_bit_code; ///< dB/bit code (dbpbcod) int floor_code; ///< floor code (floorcod) AC3BitAllocParameters bit_alloc; ///< bit allocation parameters int coarse_snr_offset; ///< coarse SNR offsets (csnroffst) int fast_gain_code[AC3_MAX_CHANNELS]; ///< fast gain codes (signal-to-mask ratio) (fgaincod) int fine_snr_offset[AC3_MAX_CHANNELS]; ///< fine SNR offsets (fsnroffst) int frame_bits_fixed; ///< number of non-coefficient bits for fixed parameters int frame_bits; ///< all frame bits except exponents and mantissas int exponent_bits; ///< number of bits used for exponents SampleType *windowed_samples; SampleType **planar_samples; uint8_t *bap_buffer; uint8_t *bap1_buffer; CoefType *mdct_coef_buffer; int32_t *fixed_coef_buffer; uint8_t *exp_buffer; uint8_t *grouped_exp_buffer; int16_t *psd_buffer; int16_t *band_psd_buffer; int16_t *mask_buffer; int16_t *qmant_buffer; uint8_t *cpl_coord_exp_buffer; uint8_t *cpl_coord_mant_buffer; uint8_t exp_strategy[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< exponent strategies uint8_t frame_exp_strategy[AC3_MAX_CHANNELS]; ///< frame exp strategy index int use_frame_exp_strategy; ///< indicates use of frame exp strategy uint8_t exp_ref_block[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< reference blocks for EXP_REUSE uint8_t *ref_bap [AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< bit allocation pointers (bap) int ref_bap_set; ///< indicates if ref_bap pointers have been set /* fixed vs. float function pointers */ void (*mdct_end)(struct AC3EncodeContext *s); int (*mdct_init)(struct AC3EncodeContext *s); /* fixed vs. float templated function pointers */ int (*allocate_sample_buffers)(struct AC3EncodeContext *s); /* AC-3 vs. E-AC-3 function pointers */ void (*output_frame_header)(struct AC3EncodeContext *s); } AC3EncodeContext; extern const uint64_t ff_ac3_channel_layouts[19]; int ff_ac3_encode_init(AVCodecContext *avctx); int ff_ac3_encode_close(AVCodecContext *avctx); int ff_ac3_validate_metadata(AC3EncodeContext *s); void ff_ac3_adjust_frame_size(AC3EncodeContext *s); void ff_ac3_compute_coupling_strategy(AC3EncodeContext *s); void ff_ac3_apply_rematrixing(AC3EncodeContext *s); void ff_ac3_process_exponents(AC3EncodeContext *s); int ff_ac3_compute_bit_allocation(AC3EncodeContext *s); void ff_ac3_group_exponents(AC3EncodeContext *s); void ff_ac3_quantize_mantissas(AC3EncodeContext *s); void ff_ac3_output_frame(AC3EncodeContext *s, unsigned char *frame); /* prototypes for functions in ac3enc_fixed.c and ac3enc_float.c */ void ff_ac3_fixed_mdct_end(AC3EncodeContext *s); void ff_ac3_float_mdct_end(AC3EncodeContext *s); int ff_ac3_fixed_mdct_init(AC3EncodeContext *s); int ff_ac3_float_mdct_init(AC3EncodeContext *s); /* prototypes for functions in ac3enc_template.c */ int ff_ac3_fixed_allocate_sample_buffers(AC3EncodeContext *s); int ff_ac3_float_allocate_sample_buffers(AC3EncodeContext *s); int ff_ac3_fixed_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr); int ff_ac3_float_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr); #endif /* AVCODEC_AC3ENC_H */