|
- /*
- * 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 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 <stdint.h>
- #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
-
- #define OFFSET(param) offsetof(AC3EncodeContext, options.param)
- #define AC3ENC_PARAM (AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM)
-
- #define AC3ENC_TYPE_AC3_FIXED 0
- #define AC3ENC_TYPE_AC3 1
- #define AC3ENC_TYPE_EAC3 2
-
- #if CONFIG_AC3ENC_FLOAT
- #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)
- typedef float SampleType;
- typedef float CoefType;
- typedef float CoefSumType;
- #else
- #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
- typedef int16_t SampleType;
- typedef int32_t CoefType;
- typedef int64_t CoefSumType;
- #endif
-
-
- #if 0
- /**
- * 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;
- #endif
- /**
- * 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
- AVCodecContext *avctx; ///< parent AVCodecContext
- PutBitContext pb; ///< bitstream writer context
- DSPContext dsp;
- AC3DSPContext ac3dsp; ///< AC-3 optimized functions
- FFTContext mdct; ///< FFT context for MDCT calculation
- 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
-
- /* fixed vs. float function pointers */
- void (*mdct_end)(struct AC3EncodeContext *s);
- 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;
-
-
- int ff_ac3_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);
-
- void ff_ac3_apply_rematrixing(AC3EncodeContext *s);
-
- void ff_ac3_process_exponents(AC3EncodeContext *s);
-
- int ff_ac3_compute_bit_allocation(AC3EncodeContext *s);
-
- void ff_ac3_quantize_mantissas(AC3EncodeContext *s);
-
- void ff_ac3_output_frame(AC3EncodeContext *s, unsigned char *frame);
-
-
- /* prototypes for functions in ac3enc_fixed.c and ac3enc_float.c */
-
- void ff_ac3_fixed_mdct_end(AC3EncodeContext *s);
- void ff_ac3_float_mdct_end(AC3EncodeContext *s);
-
- int ff_ac3_fixed_mdct_init(AC3EncodeContext *s);
- int ff_ac3_float_mdct_init(AC3EncodeContext *s);
-
-
- /* prototypes for functions in ac3enc_template.c */
-
- int ff_ac3_fixed_allocate_sample_buffers(AC3EncodeContext *s);
- int ff_ac3_float_allocate_sample_buffers(AC3EncodeContext *s);
-
- int ff_ac3_fixed_encode_frame(AVCodecContext *avctx, unsigned char *frame,
- int buf_size, void *data);
- int ff_ac3_float_encode_frame(AVCodecContext *avctx, unsigned char *frame,
- int buf_size, void *data);
-
- #endif /* AVCODEC_AC3ENC_H */
|
