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298 lines
13 KiB
298 lines
13 KiB
/* |
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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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#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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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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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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AVCodecContext *avctx; ///< parent AVCodecContext |
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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 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 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 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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/* fixed vs. float function pointers */ |
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void (*mdct_end)(AC3MDCTContext *mdct); |
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int (*mdct_init)(AVCodecContext *avctx, AC3MDCTContext *mdct, int nbits); |
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void (*apply_window)(DSPContext *dsp, SampleType *output, |
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const SampleType *input, const SampleType *window, |
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unsigned int len); |
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int (*normalize_samples)(struct AC3EncodeContext *s); |
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void (*scale_coefficients)(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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void (*deinterleave_input_samples)(struct AC3EncodeContext *s, |
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const SampleType *samples); |
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void (*apply_mdct)(struct AC3EncodeContext *s); |
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void (*apply_channel_coupling)(struct AC3EncodeContext *s); |
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void (*compute_rematrixing_strategy)(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 int64_t ff_ac3_channel_layouts[19]; |
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int ff_ac3_encode_init(AVCodecContext *avctx); |
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int ff_ac3_encode_frame(AVCodecContext *avctx, unsigned char *frame, |
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int buf_size, void *data); |
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int ff_ac3_encode_close(AVCodecContext *avctx); |
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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(AC3MDCTContext *mdct); |
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void ff_ac3_float_mdct_end(AC3MDCTContext *mdct); |
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int ff_ac3_fixed_mdct_init(AVCodecContext *avctx, AC3MDCTContext *mdct, |
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int nbits); |
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int ff_ac3_float_mdct_init(AVCodecContext *avctx, AC3MDCTContext *mdct, |
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int nbits); |
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void ff_ac3_fixed_apply_window(DSPContext *dsp, SampleType *output, |
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const SampleType *input, |
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const SampleType *window, unsigned int len); |
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void ff_ac3_float_apply_window(DSPContext *dsp, SampleType *output, |
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const SampleType *input, |
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const SampleType *window, unsigned int len); |
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int ff_ac3_fixed_normalize_samples(AC3EncodeContext *s); |
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void ff_ac3_fixed_scale_coefficients(AC3EncodeContext *s); |
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void ff_ac3_float_scale_coefficients(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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void ff_ac3_fixed_deinterleave_input_samples(AC3EncodeContext *s, |
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const SampleType *samples); |
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void ff_ac3_float_deinterleave_input_samples(AC3EncodeContext *s, |
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const SampleType *samples); |
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void ff_ac3_fixed_apply_mdct(AC3EncodeContext *s); |
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void ff_ac3_float_apply_mdct(AC3EncodeContext *s); |
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void ff_ac3_fixed_apply_channel_coupling(AC3EncodeContext *s); |
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void ff_ac3_float_apply_channel_coupling(AC3EncodeContext *s); |
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void ff_ac3_fixed_compute_rematrixing_strategy(AC3EncodeContext *s); |
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void ff_ac3_float_compute_rematrixing_strategy(AC3EncodeContext *s); |
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#endif /* AVCODEC_AC3ENC_H */
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