yading@10: /* yading@10: * AC-3 encoder & E-AC-3 encoder common header yading@10: * Copyright (c) 2000 Fabrice Bellard yading@10: * Copyright (c) 2006-2010 Justin Ruggles yading@10: * yading@10: * This file is part of Libav. yading@10: * yading@10: * Libav is free software; you can redistribute it and/or yading@10: * modify it under the terms of the GNU Lesser General Public yading@10: * License as published by the Free Software Foundation; either yading@10: * version 2.1 of the License, or (at your option) any later version. yading@10: * yading@10: * Libav is distributed in the hope that it will be useful, yading@10: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@10: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@10: * Lesser General Public License for more details. yading@10: * yading@10: * You should have received a copy of the GNU Lesser General Public yading@10: * License along with Libav; if not, write to the Free Software yading@10: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@10: */ yading@10: yading@10: /** yading@10: * @file yading@10: * AC-3 encoder & E-AC-3 encoder common header yading@10: */ yading@10: yading@10: #ifndef AVCODEC_AC3ENC_H yading@10: #define AVCODEC_AC3ENC_H yading@10: yading@10: #include yading@10: yading@10: #include "libavutil/float_dsp.h" yading@10: #include "ac3.h" yading@10: #include "ac3dsp.h" yading@10: #include "avcodec.h" yading@10: #include "dsputil.h" yading@10: #include "put_bits.h" yading@10: #include "fft.h" yading@10: yading@10: #ifndef CONFIG_AC3ENC_FLOAT yading@10: #define CONFIG_AC3ENC_FLOAT 0 yading@10: #endif yading@10: yading@10: #define OFFSET(param) offsetof(AC3EncodeContext, options.param) yading@10: #define AC3ENC_PARAM (AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM) yading@10: yading@10: #define AC3ENC_TYPE_AC3_FIXED 0 yading@10: #define AC3ENC_TYPE_AC3 1 yading@10: #define AC3ENC_TYPE_EAC3 2 yading@10: yading@10: #if CONFIG_AC3ENC_FLOAT yading@10: #define AC3_NAME(x) ff_ac3_float_ ## x yading@10: #define MAC_COEF(d,a,b) ((d)+=(a)*(b)) yading@10: #define COEF_MIN (-16777215.0/16777216.0) yading@10: #define COEF_MAX ( 16777215.0/16777216.0) yading@10: #define NEW_CPL_COORD_THRESHOLD 0.03 yading@10: typedef float SampleType; yading@10: typedef float CoefType; yading@10: typedef float CoefSumType; yading@10: #else yading@10: #define AC3_NAME(x) ff_ac3_fixed_ ## x yading@10: #define MAC_COEF(d,a,b) MAC64(d,a,b) yading@10: #define COEF_MIN -16777215 yading@10: #define COEF_MAX 16777215 yading@10: #define NEW_CPL_COORD_THRESHOLD 503317 yading@10: typedef int16_t SampleType; yading@10: typedef int32_t CoefType; yading@10: typedef int64_t CoefSumType; yading@10: #endif yading@10: yading@10: /* common option values */ yading@10: #define AC3ENC_OPT_NONE -1 yading@10: #define AC3ENC_OPT_AUTO -1 yading@10: #define AC3ENC_OPT_OFF 0 yading@10: #define AC3ENC_OPT_ON 1 yading@10: #define AC3ENC_OPT_NOT_INDICATED 0 yading@10: #define AC3ENC_OPT_MODE_ON 2 yading@10: #define AC3ENC_OPT_MODE_OFF 1 yading@10: yading@10: /* specific option values */ yading@10: #define AC3ENC_OPT_LARGE_ROOM 1 yading@10: #define AC3ENC_OPT_SMALL_ROOM 2 yading@10: #define AC3ENC_OPT_DOWNMIX_LTRT 1 yading@10: #define AC3ENC_OPT_DOWNMIX_LORO 2 yading@10: #define AC3ENC_OPT_ADCONV_STANDARD 0 yading@10: #define AC3ENC_OPT_ADCONV_HDCD 1 yading@10: yading@10: yading@10: /** yading@10: * Encoding Options used by AVOption. yading@10: */ yading@10: typedef struct AC3EncOptions { yading@10: /* AC-3 metadata options*/ yading@10: int dialogue_level; yading@10: int bitstream_mode; yading@10: float center_mix_level; yading@10: float surround_mix_level; yading@10: int dolby_surround_mode; yading@10: int audio_production_info; yading@10: int mixing_level; yading@10: int room_type; yading@10: int copyright; yading@10: int original; yading@10: int extended_bsi_1; yading@10: int preferred_stereo_downmix; yading@10: float ltrt_center_mix_level; yading@10: float ltrt_surround_mix_level; yading@10: float loro_center_mix_level; yading@10: float loro_surround_mix_level; yading@10: int extended_bsi_2; yading@10: int dolby_surround_ex_mode; yading@10: int dolby_headphone_mode; yading@10: int ad_converter_type; yading@10: int eac3_mixing_metadata; yading@10: int eac3_info_metadata; yading@10: yading@10: /* other encoding options */ yading@10: int allow_per_frame_metadata; yading@10: int stereo_rematrixing; yading@10: int channel_coupling; yading@10: int cpl_start; yading@10: } AC3EncOptions; yading@10: yading@10: /** yading@10: * Data for a single audio block. yading@10: */ yading@10: typedef struct AC3Block { yading@10: CoefType **mdct_coef; ///< MDCT coefficients yading@10: int32_t **fixed_coef; ///< fixed-point MDCT coefficients yading@10: uint8_t **exp; ///< original exponents yading@10: uint8_t **grouped_exp; ///< grouped exponents yading@10: int16_t **psd; ///< psd per frequency bin yading@10: int16_t **band_psd; ///< psd per critical band yading@10: int16_t **mask; ///< masking curve yading@10: uint16_t **qmant; ///< quantized mantissas yading@10: uint8_t **cpl_coord_exp; ///< coupling coord exponents (cplcoexp) yading@10: uint8_t **cpl_coord_mant; ///< coupling coord mantissas (cplcomant) yading@10: uint8_t coeff_shift[AC3_MAX_CHANNELS]; ///< fixed-point coefficient shift values yading@10: uint8_t new_rematrixing_strategy; ///< send new rematrixing flags in this block yading@10: int num_rematrixing_bands; ///< number of rematrixing bands yading@10: uint8_t rematrixing_flags[4]; ///< rematrixing flags yading@10: int new_cpl_strategy; ///< send new coupling strategy yading@10: int cpl_in_use; ///< coupling in use for this block (cplinu) yading@10: uint8_t channel_in_cpl[AC3_MAX_CHANNELS]; ///< channel in coupling (chincpl) yading@10: int num_cpl_channels; ///< number of channels in coupling yading@10: uint8_t new_cpl_coords[AC3_MAX_CHANNELS]; ///< send new coupling coordinates (cplcoe) yading@10: uint8_t cpl_master_exp[AC3_MAX_CHANNELS]; ///< coupling coord master exponents (mstrcplco) yading@10: int new_snr_offsets; ///< send new SNR offsets yading@10: int new_cpl_leak; ///< send new coupling leak info yading@10: int end_freq[AC3_MAX_CHANNELS]; ///< end frequency bin (endmant) yading@10: } AC3Block; yading@10: yading@10: /** yading@10: * AC-3 encoder private context. yading@10: */ yading@10: typedef struct AC3EncodeContext { yading@10: AVClass *av_class; ///< AVClass used for AVOption yading@10: AC3EncOptions options; ///< encoding options yading@10: AVCodecContext *avctx; ///< parent AVCodecContext yading@10: PutBitContext pb; ///< bitstream writer context yading@10: DSPContext dsp; yading@10: AVFloatDSPContext fdsp; yading@10: AC3DSPContext ac3dsp; ///< AC-3 optimized functions yading@10: FFTContext mdct; ///< FFT context for MDCT calculation yading@10: const SampleType *mdct_window; ///< MDCT window function array yading@10: yading@10: AC3Block blocks[AC3_MAX_BLOCKS]; ///< per-block info yading@10: yading@10: int fixed_point; ///< indicates if fixed-point encoder is being used yading@10: int eac3; ///< indicates if this is E-AC-3 vs. AC-3 yading@10: int bitstream_id; ///< bitstream id (bsid) yading@10: int bitstream_mode; ///< bitstream mode (bsmod) yading@10: yading@10: int bit_rate; ///< target bit rate, in bits-per-second yading@10: int sample_rate; ///< sampling frequency, in Hz yading@10: yading@10: int num_blks_code; ///< number of blocks code (numblkscod) yading@10: int num_blocks; ///< number of blocks per frame yading@10: int frame_size_min; ///< minimum frame size in case rounding is necessary yading@10: int frame_size; ///< current frame size in bytes yading@10: int frame_size_code; ///< frame size code (frmsizecod) yading@10: uint16_t crc_inv[2]; yading@10: int64_t bits_written; ///< bit count (used to avg. bitrate) yading@10: int64_t samples_written; ///< sample count (used to avg. bitrate) yading@10: yading@10: int fbw_channels; ///< number of full-bandwidth channels (nfchans) yading@10: int channels; ///< total number of channels (nchans) yading@10: int lfe_on; ///< indicates if there is an LFE channel (lfeon) yading@10: int lfe_channel; ///< channel index of the LFE channel yading@10: int has_center; ///< indicates if there is a center channel yading@10: int has_surround; ///< indicates if there are one or more surround channels yading@10: int channel_mode; ///< channel mode (acmod) yading@10: const uint8_t *channel_map; ///< channel map used to reorder channels yading@10: yading@10: int center_mix_level; ///< center mix level code yading@10: int surround_mix_level; ///< surround mix level code yading@10: int ltrt_center_mix_level; ///< Lt/Rt center mix level code yading@10: int ltrt_surround_mix_level; ///< Lt/Rt surround mix level code yading@10: int loro_center_mix_level; ///< Lo/Ro center mix level code yading@10: int loro_surround_mix_level; ///< Lo/Ro surround mix level code yading@10: yading@10: int cutoff; ///< user-specified cutoff frequency, in Hz yading@10: int bandwidth_code; ///< bandwidth code (0 to 60) (chbwcod) yading@10: int start_freq[AC3_MAX_CHANNELS]; ///< start frequency bin (strtmant) yading@10: int cpl_end_freq; ///< coupling channel end frequency bin yading@10: yading@10: int cpl_on; ///< coupling turned on for this frame yading@10: int cpl_enabled; ///< coupling enabled for all frames yading@10: int num_cpl_subbands; ///< number of coupling subbands (ncplsubnd) yading@10: int num_cpl_bands; ///< number of coupling bands (ncplbnd) yading@10: uint8_t cpl_band_sizes[AC3_MAX_CPL_BANDS]; ///< number of coeffs in each coupling band yading@10: yading@10: int rematrixing_enabled; ///< stereo rematrixing enabled yading@10: yading@10: /* bitrate allocation control */ yading@10: int slow_gain_code; ///< slow gain code (sgaincod) yading@10: int slow_decay_code; ///< slow decay code (sdcycod) yading@10: int fast_decay_code; ///< fast decay code (fdcycod) yading@10: int db_per_bit_code; ///< dB/bit code (dbpbcod) yading@10: int floor_code; ///< floor code (floorcod) yading@10: AC3BitAllocParameters bit_alloc; ///< bit allocation parameters yading@10: int coarse_snr_offset; ///< coarse SNR offsets (csnroffst) yading@10: int fast_gain_code[AC3_MAX_CHANNELS]; ///< fast gain codes (signal-to-mask ratio) (fgaincod) yading@10: int fine_snr_offset[AC3_MAX_CHANNELS]; ///< fine SNR offsets (fsnroffst) yading@10: int frame_bits_fixed; ///< number of non-coefficient bits for fixed parameters yading@10: int frame_bits; ///< all frame bits except exponents and mantissas yading@10: int exponent_bits; ///< number of bits used for exponents yading@10: yading@10: SampleType *windowed_samples; yading@10: SampleType **planar_samples; yading@10: uint8_t *bap_buffer; yading@10: uint8_t *bap1_buffer; yading@10: CoefType *mdct_coef_buffer; yading@10: int32_t *fixed_coef_buffer; yading@10: uint8_t *exp_buffer; yading@10: uint8_t *grouped_exp_buffer; yading@10: int16_t *psd_buffer; yading@10: int16_t *band_psd_buffer; yading@10: int16_t *mask_buffer; yading@10: int16_t *qmant_buffer; yading@10: uint8_t *cpl_coord_exp_buffer; yading@10: uint8_t *cpl_coord_mant_buffer; yading@10: yading@10: uint8_t exp_strategy[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< exponent strategies yading@10: uint8_t frame_exp_strategy[AC3_MAX_CHANNELS]; ///< frame exp strategy index yading@10: int use_frame_exp_strategy; ///< indicates use of frame exp strategy yading@10: uint8_t exp_ref_block[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< reference blocks for EXP_REUSE yading@10: uint8_t *ref_bap [AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< bit allocation pointers (bap) yading@10: int ref_bap_set; ///< indicates if ref_bap pointers have been set yading@10: yading@10: /* fixed vs. float function pointers */ yading@10: void (*mdct_end)(struct AC3EncodeContext *s); yading@10: int (*mdct_init)(struct AC3EncodeContext *s); yading@10: yading@10: /* fixed vs. float templated function pointers */ yading@10: int (*allocate_sample_buffers)(struct AC3EncodeContext *s); yading@10: yading@10: /* AC-3 vs. E-AC-3 function pointers */ yading@10: void (*output_frame_header)(struct AC3EncodeContext *s); yading@10: } AC3EncodeContext; yading@10: yading@10: yading@10: extern const uint64_t ff_ac3_channel_layouts[19]; yading@10: yading@10: int ff_ac3_encode_init(AVCodecContext *avctx); yading@10: yading@10: int ff_ac3_encode_close(AVCodecContext *avctx); yading@10: yading@10: int ff_ac3_validate_metadata(AC3EncodeContext *s); yading@10: yading@10: void ff_ac3_adjust_frame_size(AC3EncodeContext *s); yading@10: yading@10: void ff_ac3_compute_coupling_strategy(AC3EncodeContext *s); yading@10: yading@10: void ff_ac3_apply_rematrixing(AC3EncodeContext *s); yading@10: yading@10: void ff_ac3_process_exponents(AC3EncodeContext *s); yading@10: yading@10: int ff_ac3_compute_bit_allocation(AC3EncodeContext *s); yading@10: yading@10: void ff_ac3_group_exponents(AC3EncodeContext *s); yading@10: yading@10: void ff_ac3_quantize_mantissas(AC3EncodeContext *s); yading@10: yading@10: void ff_ac3_output_frame(AC3EncodeContext *s, unsigned char *frame); yading@10: yading@10: yading@10: /* prototypes for functions in ac3enc_fixed.c and ac3enc_float.c */ yading@10: yading@10: void ff_ac3_fixed_mdct_end(AC3EncodeContext *s); yading@10: void ff_ac3_float_mdct_end(AC3EncodeContext *s); yading@10: yading@10: int ff_ac3_fixed_mdct_init(AC3EncodeContext *s); yading@10: int ff_ac3_float_mdct_init(AC3EncodeContext *s); yading@10: yading@10: yading@10: /* prototypes for functions in ac3enc_template.c */ yading@10: yading@10: int ff_ac3_fixed_allocate_sample_buffers(AC3EncodeContext *s); yading@10: int ff_ac3_float_allocate_sample_buffers(AC3EncodeContext *s); yading@10: yading@10: int ff_ac3_fixed_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, yading@10: const AVFrame *frame, int *got_packet_ptr); yading@10: int ff_ac3_float_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, yading@10: const AVFrame *frame, int *got_packet_ptr); yading@10: yading@10: #endif /* AVCODEC_AC3ENC_H */