[deb_ffmpeg.git] / ffmpeg / libavcodec / ac3enc.h

/*
 * 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/float_dsp.h"

#include "ac3.h"
#include "ac3dsp.h"
#include "avcodec.h"
#include "fft.h"
#include "mathops.h"
#include "me_cmp.h"
#include "put_bits.h"
#include "audiodsp.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)
#define NEW_CPL_COORD_THRESHOLD 0.03
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
#define NEW_CPL_COORD_THRESHOLD 503317
typedef int16_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

/* 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_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  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[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;
    AVFloatDSPContext fdsp;
    MECmpContext mecc;
    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;


extern const uint64_t ff_ac3_channel_layouts[19];

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);

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_group_exponents(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, 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 */
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* AC-3 encoder & E-AC-3 encoder common header
	3	* Copyright (c) 2000 Fabrice Bellard
	4	* Copyright (c) 2006-2010 Justin Ruggles <justin.ruggles@gmail.com>
	5	*
	6	* This file is part of FFmpeg.
	7	*
	8	* FFmpeg is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU Lesser General Public
	10	* License as published by the Free Software Foundation; either
	11	* version 2.1 of the License, or (at your option) any later version.
	12	*
	13	* FFmpeg is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	* Lesser General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU Lesser General Public
	19	* License along with FFmpeg; if not, write to the Free Software
	20	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	21	*/
	22
	23	/**
	24	* @file
	25	* AC-3 encoder & E-AC-3 encoder common header
	26	*/
	27
	28	#ifndef AVCODEC_AC3ENC_H
	29	#define AVCODEC_AC3ENC_H
	30
	31	#include <stdint.h>
	32
	33	#include "libavutil/float_dsp.h"
	34
	35	#include "ac3.h"
	36	#include "ac3dsp.h"
	37	#include "avcodec.h"
	38	#include "fft.h"
	39	#include "mathops.h"
	40	#include "me_cmp.h"
	41	#include "put_bits.h"
	42	#include "audiodsp.h"
	43
	44	#ifndef CONFIG_AC3ENC_FLOAT
	45	#define CONFIG_AC3ENC_FLOAT 0
	46	#endif
	47
	48	#define OFFSET(param) offsetof(AC3EncodeContext, options.param)
	49	#define AC3ENC_PARAM (AV_OPT_FLAG_AUDIO_PARAM \| AV_OPT_FLAG_ENCODING_PARAM)
	50
	51	#define AC3ENC_TYPE_AC3_FIXED 0
	52	#define AC3ENC_TYPE_AC3 1
	53	#define AC3ENC_TYPE_EAC3 2
	54
	55	#if CONFIG_AC3ENC_FLOAT
	56	#define AC3_NAME(x) ff_ac3_float_ ## x
	57	#define MAC_COEF(d,a,b) ((d)+=(a)*(b))
	58	#define COEF_MIN (-16777215.0/16777216.0)
	59	#define COEF_MAX ( 16777215.0/16777216.0)
	60	#define NEW_CPL_COORD_THRESHOLD 0.03
	61	typedef float SampleType;
	62	typedef float CoefType;
	63	typedef float CoefSumType;
	64	#else
65	#define AC3_NAME(x) ff_ac3_fixed_ ## x
66	#define MAC_COEF(d,a,b) MAC64(d,a,b)
67	#define COEF_MIN -16777215
68	#define COEF_MAX 16777215
69	#define NEW_CPL_COORD_THRESHOLD 503317
70	typedef int16_t SampleType;
71	typedef int32_t CoefType;
72	typedef int64_t CoefSumType;
73	#endif
74
75	/* common option values */
76	#define AC3ENC_OPT_NONE -1
77	#define AC3ENC_OPT_AUTO -1
78	#define AC3ENC_OPT_OFF 0
79	#define AC3ENC_OPT_ON 1
80	#define AC3ENC_OPT_NOT_INDICATED 0
81	#define AC3ENC_OPT_MODE_ON 2
82	#define AC3ENC_OPT_MODE_OFF 1
83
84	/* specific option values */
85	#define AC3ENC_OPT_LARGE_ROOM 1
86	#define AC3ENC_OPT_SMALL_ROOM 2
87	#define AC3ENC_OPT_DOWNMIX_LTRT 1
88	#define AC3ENC_OPT_DOWNMIX_LORO 2
89	#define AC3ENC_OPT_ADCONV_STANDARD 0
90	#define AC3ENC_OPT_ADCONV_HDCD 1
91
92
93	/**
94	* Encoding Options used by AVOption.
95	*/
96	typedef struct AC3EncOptions {
97	/* AC-3 metadata options*/
98	int dialogue_level;
99	int bitstream_mode;
100	float center_mix_level;
101	float surround_mix_level;
102	int dolby_surround_mode;
103	int audio_production_info;
104	int mixing_level;
105	int room_type;
106	int copyright;
107	int original;
108	int extended_bsi_1;
109	int preferred_stereo_downmix;
110	float ltrt_center_mix_level;
111	float ltrt_surround_mix_level;
112	float loro_center_mix_level;
113	float loro_surround_mix_level;
114	int extended_bsi_2;
115	int dolby_surround_ex_mode;
116	int dolby_headphone_mode;
117	int ad_converter_type;
118	int eac3_mixing_metadata;
119	int eac3_info_metadata;
120
121	/* other encoding options */
122	int allow_per_frame_metadata;
123	int stereo_rematrixing;
124	int channel_coupling;
125	int cpl_start;
126	} AC3EncOptions;
127
128	/**
129	* Data for a single audio block.
130	*/
131	typedef struct AC3Block {
132	CoefType **mdct_coef; ///< MDCT coefficients
133	int32_t **fixed_coef; ///< fixed-point MDCT coefficients
134	uint8_t **exp; ///< original exponents
135	uint8_t **grouped_exp; ///< grouped exponents
136	int16_t **psd; ///< psd per frequency bin
137	int16_t **band_psd; ///< psd per critical band
138	int16_t **mask; ///< masking curve
139	uint16_t **qmant; ///< quantized mantissas
140	uint8_t **cpl_coord_exp; ///< coupling coord exponents (cplcoexp)
141	uint8_t **cpl_coord_mant; ///< coupling coord mantissas (cplcomant)
142	uint8_t coeff_shift[AC3_MAX_CHANNELS]; ///< fixed-point coefficient shift values
143	uint8_t new_rematrixing_strategy; ///< send new rematrixing flags in this block
144	int num_rematrixing_bands; ///< number of rematrixing bands
145	uint8_t rematrixing_flags[4]; ///< rematrixing flags
146	int new_cpl_strategy; ///< send new coupling strategy
147	int cpl_in_use; ///< coupling in use for this block (cplinu)
148	uint8_t channel_in_cpl[AC3_MAX_CHANNELS]; ///< channel in coupling (chincpl)
149	int num_cpl_channels; ///< number of channels in coupling
150	uint8_t new_cpl_coords[AC3_MAX_CHANNELS]; ///< send new coupling coordinates (cplcoe)
151	uint8_t cpl_master_exp[AC3_MAX_CHANNELS]; ///< coupling coord master exponents (mstrcplco)
152	int new_snr_offsets; ///< send new SNR offsets
153	int new_cpl_leak; ///< send new coupling leak info
154	int end_freq[AC3_MAX_CHANNELS]; ///< end frequency bin (endmant)
155	} AC3Block;
156
157	/**
158	* AC-3 encoder private context.
159	*/
160	typedef struct AC3EncodeContext {
161	AVClass *av_class; ///< AVClass used for AVOption
162	AC3EncOptions options; ///< encoding options
163	AVCodecContext *avctx; ///< parent AVCodecContext
164	PutBitContext pb; ///< bitstream writer context
165	AudioDSPContext adsp;
166	AVFloatDSPContext fdsp;
167	MECmpContext mecc;
168	AC3DSPContext ac3dsp; ///< AC-3 optimized functions
169	FFTContext mdct; ///< FFT context for MDCT calculation
170	const SampleType *mdct_window; ///< MDCT window function array
171
172	AC3Block blocks[AC3_MAX_BLOCKS]; ///< per-block info
173
174	int fixed_point; ///< indicates if fixed-point encoder is being used
175	int eac3; ///< indicates if this is E-AC-3 vs. AC-3
176	int bitstream_id; ///< bitstream id (bsid)
177	int bitstream_mode; ///< bitstream mode (bsmod)
178
179	int bit_rate; ///< target bit rate, in bits-per-second
180	int sample_rate; ///< sampling frequency, in Hz
181
182	int num_blks_code; ///< number of blocks code (numblkscod)
183	int num_blocks; ///< number of blocks per frame
184	int frame_size_min; ///< minimum frame size in case rounding is necessary
185	int frame_size; ///< current frame size in bytes
186	int frame_size_code; ///< frame size code (frmsizecod)
187	uint16_t crc_inv[2];
188	int64_t bits_written; ///< bit count (used to avg. bitrate)
189	int64_t samples_written; ///< sample count (used to avg. bitrate)
190
191	int fbw_channels; ///< number of full-bandwidth channels (nfchans)
192	int channels; ///< total number of channels (nchans)
193	int lfe_on; ///< indicates if there is an LFE channel (lfeon)
194	int lfe_channel; ///< channel index of the LFE channel
195	int has_center; ///< indicates if there is a center channel
196	int has_surround; ///< indicates if there are one or more surround channels
197	int channel_mode; ///< channel mode (acmod)
198	const uint8_t *channel_map; ///< channel map used to reorder channels
199
200	int center_mix_level; ///< center mix level code
201	int surround_mix_level; ///< surround mix level code
202	int ltrt_center_mix_level; ///< Lt/Rt center mix level code
203	int ltrt_surround_mix_level; ///< Lt/Rt surround mix level code
204	int loro_center_mix_level; ///< Lo/Ro center mix level code
205	int loro_surround_mix_level; ///< Lo/Ro surround mix level code
206
207	int cutoff; ///< user-specified cutoff frequency, in Hz
208	int bandwidth_code; ///< bandwidth code (0 to 60) (chbwcod)
209	int start_freq[AC3_MAX_CHANNELS]; ///< start frequency bin (strtmant)
210	int cpl_end_freq; ///< coupling channel end frequency bin
211
212	int cpl_on; ///< coupling turned on for this frame
213	int cpl_enabled; ///< coupling enabled for all frames
214	int num_cpl_subbands; ///< number of coupling subbands (ncplsubnd)
215	int num_cpl_bands; ///< number of coupling bands (ncplbnd)
216	uint8_t cpl_band_sizes[AC3_MAX_CPL_BANDS]; ///< number of coeffs in each coupling band
217
218	int rematrixing_enabled; ///< stereo rematrixing enabled
219
220	/* bitrate allocation control */
221	int slow_gain_code; ///< slow gain code (sgaincod)
222	int slow_decay_code; ///< slow decay code (sdcycod)
223	int fast_decay_code; ///< fast decay code (fdcycod)
224	int db_per_bit_code; ///< dB/bit code (dbpbcod)
225	int floor_code; ///< floor code (floorcod)
226	AC3BitAllocParameters bit_alloc; ///< bit allocation parameters
227	int coarse_snr_offset; ///< coarse SNR offsets (csnroffst)
228	int fast_gain_code[AC3_MAX_CHANNELS]; ///< fast gain codes (signal-to-mask ratio) (fgaincod)
229	int fine_snr_offset[AC3_MAX_CHANNELS]; ///< fine SNR offsets (fsnroffst)
230	int frame_bits_fixed; ///< number of non-coefficient bits for fixed parameters
231	int frame_bits; ///< all frame bits except exponents and mantissas
232	int exponent_bits; ///< number of bits used for exponents
233
234	SampleType *windowed_samples;
235	SampleType **planar_samples;
236	uint8_t *bap_buffer;
237	uint8_t *bap1_buffer;
238	CoefType *mdct_coef_buffer;
239	int32_t *fixed_coef_buffer;
240	uint8_t *exp_buffer;
241	uint8_t *grouped_exp_buffer;
242	int16_t *psd_buffer;
243	int16_t *band_psd_buffer;
244	int16_t *mask_buffer;
245	int16_t *qmant_buffer;
246	uint8_t *cpl_coord_exp_buffer;
247	uint8_t *cpl_coord_mant_buffer;
248
249	uint8_t exp_strategy[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< exponent strategies
250	uint8_t frame_exp_strategy[AC3_MAX_CHANNELS]; ///< frame exp strategy index
251	int use_frame_exp_strategy; ///< indicates use of frame exp strategy
252	uint8_t exp_ref_block[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< reference blocks for EXP_REUSE
253	uint8_t *ref_bap [AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< bit allocation pointers (bap)
254	int ref_bap_set; ///< indicates if ref_bap pointers have been set
255
256	/* fixed vs. float function pointers */
257	void (mdct_end)(struct AC3EncodeContext s);
258	int (mdct_init)(struct AC3EncodeContext s);
259
260	/* fixed vs. float templated function pointers */
261	int (allocate_sample_buffers)(struct AC3EncodeContext s);
262
263	/* AC-3 vs. E-AC-3 function pointers */
264	void (output_frame_header)(struct AC3EncodeContext s);
265	} AC3EncodeContext;
266
267
268	extern const uint64_t ff_ac3_channel_layouts[19];
269
270	int ff_ac3_encode_init(AVCodecContext *avctx);
271	int ff_ac3_float_encode_init(AVCodecContext *avctx);
272
273	int ff_ac3_encode_close(AVCodecContext *avctx);
274
275	int ff_ac3_validate_metadata(AC3EncodeContext *s);
276
277	void ff_ac3_adjust_frame_size(AC3EncodeContext *s);
278
279	void ff_ac3_compute_coupling_strategy(AC3EncodeContext *s);
280
281	void ff_ac3_apply_rematrixing(AC3EncodeContext *s);
282
283	void ff_ac3_process_exponents(AC3EncodeContext *s);
284
285	int ff_ac3_compute_bit_allocation(AC3EncodeContext *s);
286
287	void ff_ac3_group_exponents(AC3EncodeContext *s);
288
289	void ff_ac3_quantize_mantissas(AC3EncodeContext *s);
290
291	void ff_ac3_output_frame(AC3EncodeContext s, unsigned char frame);
292
293
294	/* prototypes for functions in ac3enc_fixed.c and ac3enc_float.c */
295
296	void ff_ac3_fixed_mdct_end(AC3EncodeContext *s);
297	void ff_ac3_float_mdct_end(AC3EncodeContext *s);
298
299	int ff_ac3_fixed_mdct_init(AC3EncodeContext *s);
300	int ff_ac3_float_mdct_init(AC3EncodeContext *s);
301
302
303	/* prototypes for functions in ac3enc_template.c */
304
305	int ff_ac3_fixed_allocate_sample_buffers(AC3EncodeContext *s);
306	int ff_ac3_float_allocate_sample_buffers(AC3EncodeContext *s);
307
308	int ff_ac3_fixed_encode_frame(AVCodecContext avctx, AVPacket avpkt,
309	const AVFrame frame, int got_packet_ptr);
310	int ff_ac3_float_encode_frame(AVCodecContext avctx, AVPacket avpkt,
311	const AVFrame frame, int got_packet_ptr);
312
313	#endif /* AVCODEC_AC3ENC_H */