From c8e9ea43d004be04e4a9a07736104d099a5bf1f9 Mon Sep 17 00:00:00 2001 From: Justin Ruggles Date: Tue, 7 Jun 2011 12:47:09 -0400 Subject: Move E-AC-3 encoder functions to a separate eac3enc.c file. --- libavcodec/ac3enc.h | 214 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 214 insertions(+) create mode 100644 libavcodec/ac3enc.h (limited to 'libavcodec/ac3enc.h') diff --git a/libavcodec/ac3enc.h b/libavcodec/ac3enc.h new file mode 100644 index 0000000000..0541683537 --- /dev/null +++ b/libavcodec/ac3enc.h @@ -0,0 +1,214 @@ +/* + * AC-3 encoder & E-AC-3 encoder common header + * Copyright (c) 2000 Fabrice Bellard + * Copyright (c) 2006-2010 Justin Ruggles + * + * 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 +#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 + +#if CONFIG_AC3ENC_FLOAT +#define MAC_COEF(d,a,b) ((d)+=(a)*(b)) +typedef float SampleType; +typedef float CoefType; +typedef float CoefSumType; +#else +#define MAC_COEF(d,a,b) MAC64(d,a,b) +typedef int16_t SampleType; +typedef int32_t CoefType; +typedef int64_t CoefSumType; +#endif + +typedef struct AC3MDCTContext { + const SampleType *window; ///< MDCT window function + FFTContext fft; ///< FFT context for MDCT calculation +} AC3MDCTContext; + +/** + * 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; + + /* 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; ///< 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 + PutBitContext pb; ///< bitstream writer context + DSPContext dsp; + AC3DSPContext ac3dsp; ///< AC-3 optimized functions + AC3MDCTContext mdct; ///< MDCT context + + AC3Block blocks[AC3_MAX_BLOCKS]; ///< per-block info + + 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 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 **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; + uint16_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 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 + + DECLARE_ALIGNED(32, SampleType, windowed_samples)[AC3_WINDOW_SIZE]; +} AC3EncodeContext; + +#endif /* AVCODEC_AC3ENC_H */ -- cgit v1.2.3