Move E-AC-3 encoder functions to a separate eac3enc.c file.

1 files changed, 214 insertions, 0 deletions

diff --git a/libavcodec/ac3enc.h b/libavcodec/ac3enc.h
new file mode 100644
index 0000000000..0541683537
--- /dev/null
+++ b/libavcodec/ac3enc.h
@@ -0,0 +1,214 @@
+/*
+ * 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
+
+#if CONFIG_AC3ENC_FLOAT
+#define MAC_COEF(d,a,b) ((d)+=(a)*(b))
+typedef float SampleType;
+typedef float CoefType;
+typedef float CoefSumType;
+#else
+#define MAC_COEF(d,a,b) MAC64(d,a,b)
+typedef int16_t SampleType;
+typedef int32_t CoefType;
+typedef int64_t CoefSumType;
+#endif
+
+typedef struct AC3MDCTContext {
+    const SampleType *window;           ///< MDCT window function
+    FFTContext fft;                     ///< FFT context for MDCT calculation
+} AC3MDCTContext;
+
+/**
+ * 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;
+
+/**
+ * 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
+    PutBitContext pb;                       ///< bitstream writer context
+    DSPContext dsp;
+    AC3DSPContext ac3dsp;                   ///< AC-3 optimized functions
+    AC3MDCTContext mdct;                    ///< MDCT context
+
+    AC3Block blocks[AC3_MAX_BLOCKS];        ///< per-block info
+
+    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 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 **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;
+    uint16_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 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
+
+    DECLARE_ALIGNED(32, SampleType, windowed_samples)[AC3_WINDOW_SIZE];
+} AC3EncodeContext;
+
+#endif /* AVCODEC_AC3ENC_H */