| /* | |
| * 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 FFmpeg. | |
| * | |
| * FFmpeg 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. | |
| * | |
| * FFmpeg 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 FFmpeg; 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/opt.h" | |
| #include "libavutil/tx.h" | |
| #include "ac3.h" | |
| #include "ac3defs.h" | |
| #include "ac3dsp.h" | |
| #include "avcodec.h" | |
| #include "codec_internal.h" | |
| #include "mathops.h" | |
| #include "me_cmp.h" | |
| #include "put_bits.h" | |
| #include "audiodsp.h" | |
| #ifndef AC3ENC_FLOAT | |
| #define AC3ENC_FLOAT 0 | |
| #endif | |
| #if AC3ENC_FLOAT | |
| #include "libavutil/float_dsp.h" | |
| #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 | |
| #include "libavutil/fixed_dsp.h" | |
| #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 int32_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 | |
| #define AC3ENC_OPT_DSUREX_DPLIIZ 3 | |
| /* 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_DOWNMIX_DPLII 3 // reserved value in A/52, but used by encoders to indicate DPL2 | |
| #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 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 | |
| AudioDSPContext adsp; | |
| #if AC3ENC_FLOAT | |
| AVFloatDSPContext *fdsp; | |
| #else | |
| AVFixedDSPContext *fdsp; | |
| #endif | |
| MECmpContext mecc; | |
| AC3DSPContext ac3dsp; ///< AC-3 optimized functions | |
| AVTXContext *tx; ///< FFT context for MDCT calculation | |
| av_tx_fn tx_fn; | |
| 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 | |
| int warned_alternate_bitstream; | |
| /* fixed vs. float function pointers */ | |
| 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 AVChannelLayout ff_ac3_ch_layouts[19]; | |
| extern const AVOption ff_ac3_enc_options[]; | |
| extern const AVClass ff_ac3enc_class; | |
| extern const FFCodecDefault ff_ac3_enc_defaults[]; | |
| int ff_ac3_encode_init(AVCodecContext *avctx); | |
| int ff_ac3_float_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); | |
| int ff_ac3_encode_frame_common_end(AVCodecContext *avctx, AVPacket *avpkt, | |
| const AVFrame *frame, int *got_packet_ptr); | |
| /* prototypes for functions in ac3enc_template.c */ | |
| 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 */ |