318 lines
14 KiB
C
318 lines
14 KiB
C
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/*
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* AC-3 encoder & E-AC-3 encoder common header
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* Copyright (c) 2000 Fabrice Bellard
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* Copyright (c) 2006-2010 Justin Ruggles <justin.ruggles@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* AC-3 encoder & E-AC-3 encoder common header
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*/
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#ifndef AVCODEC_AC3ENC_H
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#define AVCODEC_AC3ENC_H
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#include <stdint.h>
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#include "libavutil/float_dsp.h"
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#include "ac3.h"
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#include "ac3dsp.h"
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#include "avcodec.h"
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#include "fft.h"
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#include "mathops.h"
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#include "me_cmp.h"
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#include "put_bits.h"
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#include "audiodsp.h"
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#ifndef CONFIG_AC3ENC_FLOAT
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#define CONFIG_AC3ENC_FLOAT 0
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#endif
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#define OFFSET(param) offsetof(AC3EncodeContext, options.param)
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#define AC3ENC_PARAM (AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM)
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#define AC3ENC_TYPE_AC3_FIXED 0
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#define AC3ENC_TYPE_AC3 1
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#define AC3ENC_TYPE_EAC3 2
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#if CONFIG_AC3ENC_FLOAT
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#define AC3_NAME(x) ff_ac3_float_ ## x
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#define MAC_COEF(d,a,b) ((d)+=(a)*(b))
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#define COEF_MIN (-16777215.0/16777216.0)
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#define COEF_MAX ( 16777215.0/16777216.0)
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#define NEW_CPL_COORD_THRESHOLD 0.03
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typedef float SampleType;
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typedef float CoefType;
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typedef float CoefSumType;
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#else
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#define AC3_NAME(x) ff_ac3_fixed_ ## x
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#define MAC_COEF(d,a,b) MAC64(d,a,b)
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#define COEF_MIN -16777215
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#define COEF_MAX 16777215
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#define NEW_CPL_COORD_THRESHOLD 503317
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typedef int16_t SampleType;
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typedef int32_t CoefType;
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typedef int64_t CoefSumType;
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#endif
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/* common option values */
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#define AC3ENC_OPT_NONE -1
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#define AC3ENC_OPT_AUTO -1
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#define AC3ENC_OPT_OFF 0
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#define AC3ENC_OPT_ON 1
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#define AC3ENC_OPT_NOT_INDICATED 0
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#define AC3ENC_OPT_MODE_ON 2
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#define AC3ENC_OPT_MODE_OFF 1
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#define AC3ENC_OPT_DSUREX_DPLIIZ 3
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/* specific option values */
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#define AC3ENC_OPT_LARGE_ROOM 1
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#define AC3ENC_OPT_SMALL_ROOM 2
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#define AC3ENC_OPT_DOWNMIX_LTRT 1
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#define AC3ENC_OPT_DOWNMIX_LORO 2
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#define AC3ENC_OPT_DOWNMIX_DPLII 3 // reserved value in A/52, but used by encoders to indicate DPL2
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#define AC3ENC_OPT_ADCONV_STANDARD 0
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#define AC3ENC_OPT_ADCONV_HDCD 1
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/**
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* Encoding Options used by AVOption.
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*/
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typedef struct AC3EncOptions {
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/* AC-3 metadata options*/
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int dialogue_level;
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int bitstream_mode;
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float center_mix_level;
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float surround_mix_level;
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int dolby_surround_mode;
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int audio_production_info;
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int mixing_level;
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int room_type;
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int copyright;
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int original;
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int extended_bsi_1;
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int preferred_stereo_downmix;
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float ltrt_center_mix_level;
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float ltrt_surround_mix_level;
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float loro_center_mix_level;
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float loro_surround_mix_level;
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int extended_bsi_2;
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int dolby_surround_ex_mode;
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int dolby_headphone_mode;
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int ad_converter_type;
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int eac3_mixing_metadata;
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int eac3_info_metadata;
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/* other encoding options */
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int allow_per_frame_metadata;
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int stereo_rematrixing;
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int channel_coupling;
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int cpl_start;
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} AC3EncOptions;
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/**
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* Data for a single audio block.
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*/
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typedef struct AC3Block {
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CoefType **mdct_coef; ///< MDCT coefficients
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int32_t **fixed_coef; ///< fixed-point MDCT coefficients
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uint8_t **exp; ///< original exponents
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uint8_t **grouped_exp; ///< grouped exponents
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int16_t **psd; ///< psd per frequency bin
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int16_t **band_psd; ///< psd per critical band
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int16_t **mask; ///< masking curve
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uint16_t **qmant; ///< quantized mantissas
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uint8_t **cpl_coord_exp; ///< coupling coord exponents (cplcoexp)
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uint8_t **cpl_coord_mant; ///< coupling coord mantissas (cplcomant)
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uint8_t coeff_shift[AC3_MAX_CHANNELS]; ///< fixed-point coefficient shift values
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uint8_t new_rematrixing_strategy; ///< send new rematrixing flags in this block
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int num_rematrixing_bands; ///< number of rematrixing bands
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uint8_t rematrixing_flags[4]; ///< rematrixing flags
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int new_cpl_strategy; ///< send new coupling strategy
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int cpl_in_use; ///< coupling in use for this block (cplinu)
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uint8_t channel_in_cpl[AC3_MAX_CHANNELS]; ///< channel in coupling (chincpl)
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int num_cpl_channels; ///< number of channels in coupling
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uint8_t new_cpl_coords[AC3_MAX_CHANNELS]; ///< send new coupling coordinates (cplcoe)
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uint8_t cpl_master_exp[AC3_MAX_CHANNELS]; ///< coupling coord master exponents (mstrcplco)
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int new_snr_offsets; ///< send new SNR offsets
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int new_cpl_leak; ///< send new coupling leak info
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int end_freq[AC3_MAX_CHANNELS]; ///< end frequency bin (endmant)
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} AC3Block;
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/**
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* AC-3 encoder private context.
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*/
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typedef struct AC3EncodeContext {
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AVClass *av_class; ///< AVClass used for AVOption
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AC3EncOptions options; ///< encoding options
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AVCodecContext *avctx; ///< parent AVCodecContext
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PutBitContext pb; ///< bitstream writer context
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AudioDSPContext adsp;
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AVFloatDSPContext *fdsp;
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MECmpContext mecc;
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AC3DSPContext ac3dsp; ///< AC-3 optimized functions
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FFTContext mdct; ///< FFT context for MDCT calculation
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const SampleType *mdct_window; ///< MDCT window function array
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AC3Block blocks[AC3_MAX_BLOCKS]; ///< per-block info
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int fixed_point; ///< indicates if fixed-point encoder is being used
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int eac3; ///< indicates if this is E-AC-3 vs. AC-3
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int bitstream_id; ///< bitstream id (bsid)
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int bitstream_mode; ///< bitstream mode (bsmod)
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int bit_rate; ///< target bit rate, in bits-per-second
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int sample_rate; ///< sampling frequency, in Hz
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int num_blks_code; ///< number of blocks code (numblkscod)
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int num_blocks; ///< number of blocks per frame
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int frame_size_min; ///< minimum frame size in case rounding is necessary
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int frame_size; ///< current frame size in bytes
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int frame_size_code; ///< frame size code (frmsizecod)
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uint16_t crc_inv[2];
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int64_t bits_written; ///< bit count (used to avg. bitrate)
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int64_t samples_written; ///< sample count (used to avg. bitrate)
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int fbw_channels; ///< number of full-bandwidth channels (nfchans)
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int channels; ///< total number of channels (nchans)
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int lfe_on; ///< indicates if there is an LFE channel (lfeon)
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int lfe_channel; ///< channel index of the LFE channel
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int has_center; ///< indicates if there is a center channel
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int has_surround; ///< indicates if there are one or more surround channels
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int channel_mode; ///< channel mode (acmod)
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const uint8_t *channel_map; ///< channel map used to reorder channels
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int center_mix_level; ///< center mix level code
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int surround_mix_level; ///< surround mix level code
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int ltrt_center_mix_level; ///< Lt/Rt center mix level code
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int ltrt_surround_mix_level; ///< Lt/Rt surround mix level code
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int loro_center_mix_level; ///< Lo/Ro center mix level code
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int loro_surround_mix_level; ///< Lo/Ro surround mix level code
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int cutoff; ///< user-specified cutoff frequency, in Hz
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int bandwidth_code; ///< bandwidth code (0 to 60) (chbwcod)
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int start_freq[AC3_MAX_CHANNELS]; ///< start frequency bin (strtmant)
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int cpl_end_freq; ///< coupling channel end frequency bin
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int cpl_on; ///< coupling turned on for this frame
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int cpl_enabled; ///< coupling enabled for all frames
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int num_cpl_subbands; ///< number of coupling subbands (ncplsubnd)
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int num_cpl_bands; ///< number of coupling bands (ncplbnd)
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uint8_t cpl_band_sizes[AC3_MAX_CPL_BANDS]; ///< number of coeffs in each coupling band
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int rematrixing_enabled; ///< stereo rematrixing enabled
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/* bitrate allocation control */
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int slow_gain_code; ///< slow gain code (sgaincod)
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int slow_decay_code; ///< slow decay code (sdcycod)
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int fast_decay_code; ///< fast decay code (fdcycod)
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int db_per_bit_code; ///< dB/bit code (dbpbcod)
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int floor_code; ///< floor code (floorcod)
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AC3BitAllocParameters bit_alloc; ///< bit allocation parameters
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int coarse_snr_offset; ///< coarse SNR offsets (csnroffst)
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int fast_gain_code[AC3_MAX_CHANNELS]; ///< fast gain codes (signal-to-mask ratio) (fgaincod)
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int fine_snr_offset[AC3_MAX_CHANNELS]; ///< fine SNR offsets (fsnroffst)
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int frame_bits_fixed; ///< number of non-coefficient bits for fixed parameters
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int frame_bits; ///< all frame bits except exponents and mantissas
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int exponent_bits; ///< number of bits used for exponents
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SampleType *windowed_samples;
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SampleType **planar_samples;
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uint8_t *bap_buffer;
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uint8_t *bap1_buffer;
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CoefType *mdct_coef_buffer;
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int32_t *fixed_coef_buffer;
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uint8_t *exp_buffer;
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uint8_t *grouped_exp_buffer;
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int16_t *psd_buffer;
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int16_t *band_psd_buffer;
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int16_t *mask_buffer;
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int16_t *qmant_buffer;
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uint8_t *cpl_coord_exp_buffer;
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uint8_t *cpl_coord_mant_buffer;
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uint8_t exp_strategy[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< exponent strategies
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uint8_t frame_exp_strategy[AC3_MAX_CHANNELS]; ///< frame exp strategy index
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int use_frame_exp_strategy; ///< indicates use of frame exp strategy
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uint8_t exp_ref_block[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< reference blocks for EXP_REUSE
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uint8_t *ref_bap [AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< bit allocation pointers (bap)
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int ref_bap_set; ///< indicates if ref_bap pointers have been set
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int warned_alternate_bitstream;
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/* fixed vs. float function pointers */
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void (*mdct_end)(struct AC3EncodeContext *s);
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int (*mdct_init)(struct AC3EncodeContext *s);
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/* fixed vs. float templated function pointers */
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int (*allocate_sample_buffers)(struct AC3EncodeContext *s);
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/* AC-3 vs. E-AC-3 function pointers */
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void (*output_frame_header)(struct AC3EncodeContext *s);
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} AC3EncodeContext;
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extern const uint64_t ff_ac3_channel_layouts[19];
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int ff_ac3_encode_init(AVCodecContext *avctx);
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int ff_ac3_float_encode_init(AVCodecContext *avctx);
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int ff_ac3_encode_close(AVCodecContext *avctx);
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int ff_ac3_validate_metadata(AC3EncodeContext *s);
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void ff_ac3_adjust_frame_size(AC3EncodeContext *s);
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void ff_ac3_compute_coupling_strategy(AC3EncodeContext *s);
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void ff_ac3_apply_rematrixing(AC3EncodeContext *s);
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void ff_ac3_process_exponents(AC3EncodeContext *s);
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int ff_ac3_compute_bit_allocation(AC3EncodeContext *s);
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void ff_ac3_group_exponents(AC3EncodeContext *s);
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void ff_ac3_quantize_mantissas(AC3EncodeContext *s);
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void ff_ac3_output_frame(AC3EncodeContext *s, unsigned char *frame);
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/* prototypes for functions in ac3enc_fixed.c and ac3enc_float.c */
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void ff_ac3_fixed_mdct_end(AC3EncodeContext *s);
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void ff_ac3_float_mdct_end(AC3EncodeContext *s);
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int ff_ac3_fixed_mdct_init(AC3EncodeContext *s);
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int ff_ac3_float_mdct_init(AC3EncodeContext *s);
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/* prototypes for functions in ac3enc_template.c */
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int ff_ac3_fixed_allocate_sample_buffers(AC3EncodeContext *s);
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int ff_ac3_float_allocate_sample_buffers(AC3EncodeContext *s);
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int ff_ac3_fixed_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
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const AVFrame *frame, int *got_packet_ptr);
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int ff_ac3_float_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
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const AVFrame *frame, int *got_packet_ptr);
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#endif /* AVCODEC_AC3ENC_H */
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