mirror of https://github.com/FFmpeg/FFmpeg.git
Justin Ruggles
14 years ago
parent
787a13535a
commit
c8e9ea43d0
5 changed files with 396 additions and 280 deletions
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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 Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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 "ac3.h" |
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#include "ac3dsp.h" |
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#include "avcodec.h" |
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#include "dsputil.h" |
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#include "put_bits.h" |
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#include "fft.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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#if CONFIG_AC3ENC_FLOAT |
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#define MAC_COEF(d,a,b) ((d)+=(a)*(b)) |
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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 MAC_COEF(d,a,b) MAC64(d,a,b) |
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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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typedef struct AC3MDCTContext { |
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const SampleType *window; ///< MDCT window function
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FFTContext fft; ///< FFT context for MDCT calculation
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} AC3MDCTContext; |
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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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/* 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; ///< 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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PutBitContext pb; ///< bitstream writer context
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DSPContext dsp; |
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AC3DSPContext ac3dsp; ///< AC-3 optimized functions
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AC3MDCTContext mdct; ///< MDCT context
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AC3Block blocks[AC3_MAX_BLOCKS]; ///< per-block info
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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 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 **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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uint16_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 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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DECLARE_ALIGNED(32, SampleType, windowed_samples)[AC3_WINDOW_SIZE]; |
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} AC3EncodeContext; |
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#endif /* AVCODEC_AC3ENC_H */ |
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@ -0,0 +1,131 @@ |
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/*
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* E-AC-3 encoder |
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* Copyright (c) 2011 Justin Ruggles <justin.ruggles@gmail.com> |
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* |
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* This file is part of Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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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* E-AC-3 encoder |
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*/ |
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#define CONFIG_AC3ENC_FLOAT 1 |
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#include "ac3enc.h" |
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#include "eac3enc.h" |
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void ff_eac3_set_cpl_states(AC3EncodeContext *s) |
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{ |
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int ch, blk; |
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int first_cpl_coords[AC3_MAX_CHANNELS]; |
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/* set first cpl coords */ |
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for (ch = 1; ch <= s->fbw_channels; ch++) |
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first_cpl_coords[ch] = 1; |
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for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) { |
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AC3Block *block = &s->blocks[blk]; |
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for (ch = 1; ch <= s->fbw_channels; ch++) { |
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if (block->channel_in_cpl[ch]) { |
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if (first_cpl_coords[ch]) { |
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block->new_cpl_coords = 2; |
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first_cpl_coords[ch] = 0; |
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} |
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} else { |
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first_cpl_coords[ch] = 1; |
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} |
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} |
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} |
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/* set first cpl leak */ |
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for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) { |
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AC3Block *block = &s->blocks[blk]; |
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if (block->cpl_in_use) { |
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block->new_cpl_leak = 2; |
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break; |
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} |
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} |
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} |
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void ff_eac3_output_frame_header(AC3EncodeContext *s) |
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{ |
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int blk, ch; |
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AC3EncOptions *opt = &s->options; |
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put_bits(&s->pb, 16, 0x0b77); /* sync word */ |
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/* BSI header */ |
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put_bits(&s->pb, 2, 0); /* stream type = independent */ |
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put_bits(&s->pb, 3, 0); /* substream id = 0 */ |
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put_bits(&s->pb, 11, (s->frame_size / 2) - 1); /* frame size */ |
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if (s->bit_alloc.sr_shift) { |
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put_bits(&s->pb, 2, 0x3); /* fscod2 */ |
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put_bits(&s->pb, 2, s->bit_alloc.sr_code); /* sample rate code */ |
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} else { |
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put_bits(&s->pb, 2, s->bit_alloc.sr_code); /* sample rate code */ |
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put_bits(&s->pb, 2, 0x3); /* number of blocks = 6 */ |
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} |
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put_bits(&s->pb, 3, s->channel_mode); /* audio coding mode */ |
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put_bits(&s->pb, 1, s->lfe_on); /* LFE channel indicator */ |
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put_bits(&s->pb, 5, s->bitstream_id); /* bitstream id (EAC3=16) */ |
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put_bits(&s->pb, 5, -opt->dialogue_level); /* dialogue normalization level */ |
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put_bits(&s->pb, 1, 0); /* no compression gain */ |
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put_bits(&s->pb, 1, 0); /* no mixing metadata */ |
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/* TODO: mixing metadata */ |
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put_bits(&s->pb, 1, 0); /* no info metadata */ |
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/* TODO: info metadata */ |
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put_bits(&s->pb, 1, 0); /* no additional bit stream info */ |
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/* frame header */ |
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put_bits(&s->pb, 1, 1); /* exponent strategy syntax = each block */ |
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put_bits(&s->pb, 1, 0); /* aht enabled = no */ |
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put_bits(&s->pb, 2, 0); /* snr offset strategy = 1 */ |
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put_bits(&s->pb, 1, 0); /* transient pre-noise processing enabled = no */ |
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put_bits(&s->pb, 1, 0); /* block switch syntax enabled = no */ |
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put_bits(&s->pb, 1, 0); /* dither flag syntax enabled = no */ |
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put_bits(&s->pb, 1, 0); /* bit allocation model syntax enabled = no */ |
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put_bits(&s->pb, 1, 0); /* fast gain codes enabled = no */ |
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put_bits(&s->pb, 1, 0); /* dba syntax enabled = no */ |
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put_bits(&s->pb, 1, 0); /* skip field syntax enabled = no */ |
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put_bits(&s->pb, 1, 0); /* spx enabled = no */ |
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/* coupling strategy use flags */ |
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if (s->channel_mode > AC3_CHMODE_MONO) { |
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put_bits(&s->pb, 1, s->blocks[0].cpl_in_use); |
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for (blk = 1; blk < AC3_MAX_BLOCKS; blk++) { |
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AC3Block *block = &s->blocks[blk]; |
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put_bits(&s->pb, 1, block->new_cpl_strategy); |
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if (block->new_cpl_strategy) |
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put_bits(&s->pb, 1, block->cpl_in_use); |
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} |
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} |
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/* exponent strategy */ |
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for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) |
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for (ch = !s->blocks[blk].cpl_in_use; ch <= s->fbw_channels; ch++) |
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put_bits(&s->pb, 2, s->exp_strategy[ch][blk]); |
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if (s->lfe_on) { |
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for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) |
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put_bits(&s->pb, 1, s->exp_strategy[s->lfe_channel][blk]); |
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} |
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/* E-AC-3 to AC-3 converter exponent strategy (unfortunately not optional...) */ |
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for (ch = 1; ch <= s->fbw_channels; ch++) |
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put_bits(&s->pb, 5, 0); |
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/* snr offsets */ |
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put_bits(&s->pb, 6, s->coarse_snr_offset); |
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put_bits(&s->pb, 4, s->fine_snr_offset[1]); |
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/* block start info */ |
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put_bits(&s->pb, 1, 0); |
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} |
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@ -0,0 +1,44 @@ |
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/*
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* E-AC-3 encoder |
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* Copyright (c) 2011 Justin Ruggles <justin.ruggles@gmail.com> |
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* |
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* This file is part of Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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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* E-AC-3 encoder |
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*/ |
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#ifndef AVCODEC_EAC3ENC_H |
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#define AVCODEC_EAC3ENC_H |
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#include "ac3enc.h" |
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/**
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* Set coupling states. |
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* This determines whether certain flags must be written to the bitstream or |
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* whether they will be implicitly already known by the decoder. |
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*/ |
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void ff_eac3_set_cpl_states(AC3EncodeContext *s); |
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/**
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* Write the E-AC-3 frame header to the output bitstream. |
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*/ |
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void ff_eac3_output_frame_header(AC3EncodeContext *s); |
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#endif /* AVCODEC_EAC3ENC_H */ |
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