+/*
+ * 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
+ */
-#define AC3_FRAME_SIZE (6*256)
-#define AC3_MAX_CODED_FRAME_SIZE 3840 /* in bytes */
-#define AC3_MAX_CHANNELS 2 /* we handle at most two channels, although
- AC3 allows 6 channels */
+/**
+ * @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)
+#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 {
- PutBitContext pb;
- int nb_channels;
- int bit_rate;
- int sample_rate;
- int bsid;
- int frame_size_min; /* minimum frame size in case rounding is necessary */
- int frame_size; /* current frame size in words */
- int halfratecod;
- int frmsizecod;
- int fscod; /* frequency */
- int acmod;
- int bsmod;
- short last_samples[AC3_MAX_CHANNELS][256];
- int chbwcod[AC3_MAX_CHANNELS];
- int nb_coefs[AC3_MAX_CHANNELS];
-
+ 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 sgaincod, sdecaycod, fdecaycod, dbkneecod, floorcod;
- int sgain, sdecay, fdecay, dbknee, floor;
- int csnroffst;
- int fgaincod[AC3_MAX_CHANNELS];
- int fsnroffst[AC3_MAX_CHANNELS];
- /* mantissa encoding */
- int mant1_cnt, mant2_cnt, mant4_cnt;
+ 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 int64_t ff_ac3_channel_layouts[19];
+
+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_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, 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 */