mirror of https://git.ffmpeg.org/ffmpeg.git
262 lines
10 KiB
C
262 lines
10 KiB
C
/*
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* AAC encoder
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* Copyright (C) 2008 Konstantin Shishkov
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_AACENC_H
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#define AVCODEC_AACENC_H
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#include <stdint.h>
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#include "libavutil/channel_layout.h"
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#include "libavutil/float_dsp.h"
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#include "libavutil/mem_internal.h"
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#include "libavutil/tx.h"
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#include "avcodec.h"
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#include "put_bits.h"
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#include "aac.h"
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#include "aacencdsp.h"
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#include "audio_frame_queue.h"
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#include "psymodel.h"
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#include "lpc.h"
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#define CLIP_AVOIDANCE_FACTOR 0.95f
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typedef enum AACCoder {
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AAC_CODER_ANMR = 0,
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AAC_CODER_TWOLOOP,
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AAC_CODER_FAST,
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AAC_CODER_NB,
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}AACCoder;
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/**
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* Predictor State
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*/
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typedef struct PredictorState {
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float cor0;
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float cor1;
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float var0;
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float var1;
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float r0;
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float r1;
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float k1;
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float x_est;
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} PredictorState;
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typedef struct AACEncOptions {
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int coder;
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int pns;
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int tns;
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int ltp;
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int pce;
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int pred;
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int mid_side;
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int intensity_stereo;
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} AACEncOptions;
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/**
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* Long Term Prediction
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*/
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typedef struct LongTermPrediction {
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int8_t present;
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int16_t lag;
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int coef_idx;
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float coef;
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int8_t used[MAX_LTP_LONG_SFB];
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} LongTermPrediction;
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/**
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* Individual Channel Stream
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*/
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typedef struct IndividualChannelStream {
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uint8_t max_sfb; ///< number of scalefactor bands per group
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enum WindowSequence window_sequence[2];
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uint8_t use_kb_window[2]; ///< If set, use Kaiser-Bessel window, otherwise use a sine window.
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uint8_t group_len[8];
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LongTermPrediction ltp;
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const uint16_t *swb_offset; ///< table of offsets to the lowest spectral coefficient of a scalefactor band, sfb, for a particular window
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const uint8_t *swb_sizes; ///< table of scalefactor band sizes for a particular window
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int num_swb; ///< number of scalefactor window bands
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int num_windows;
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int tns_max_bands;
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int predictor_present;
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int predictor_initialized;
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int predictor_reset_group;
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int predictor_reset_count[31]; ///< used to count prediction resets
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uint8_t prediction_used[41];
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uint8_t window_clipping[8]; ///< set if a certain window is near clipping
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float clip_avoidance_factor; ///< set if any window is near clipping to the necessary atennuation factor to avoid it
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} IndividualChannelStream;
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/**
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* Temporal Noise Shaping
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*/
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typedef struct TemporalNoiseShaping {
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int present;
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int n_filt[8];
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int length[8][4];
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int direction[8][4];
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int order[8][4];
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int coef_idx[8][4][TNS_MAX_ORDER];
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float coef[8][4][TNS_MAX_ORDER];
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} TemporalNoiseShaping;
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/**
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* Single Channel Element - used for both SCE and LFE elements.
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*/
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typedef struct SingleChannelElement {
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IndividualChannelStream ics;
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TemporalNoiseShaping tns;
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Pulse pulse;
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enum BandType band_type[128]; ///< band types
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enum BandType band_alt[128]; ///< alternative band type
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int sf_idx[128]; ///< scalefactor indices
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uint8_t zeroes[128]; ///< band is not coded
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uint8_t can_pns[128]; ///< band is allowed to PNS (informative)
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float is_ener[128]; ///< Intensity stereo pos
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float pns_ener[128]; ///< Noise energy values
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DECLARE_ALIGNED(32, float, pcoeffs)[1024]; ///< coefficients for IMDCT, pristine
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DECLARE_ALIGNED(32, float, coeffs)[1024]; ///< coefficients for IMDCT, maybe processed
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DECLARE_ALIGNED(32, float, ret_buf)[2048]; ///< PCM output buffer
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DECLARE_ALIGNED(16, float, ltp_state)[3072]; ///< time signal for LTP
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DECLARE_ALIGNED(32, float, lcoeffs)[1024]; ///< MDCT of LTP coefficients
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DECLARE_ALIGNED(32, float, prcoeffs)[1024]; ///< Main prediction coefs
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PredictorState predictor_state[MAX_PREDICTORS];
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} SingleChannelElement;
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/**
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* channel element - generic struct for SCE/CPE/CCE/LFE
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*/
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typedef struct ChannelElement {
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// CPE specific
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int common_window; ///< Set if channels share a common 'IndividualChannelStream' in bitstream.
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int ms_mode; ///< Signals mid/side stereo flags coding mode
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uint8_t is_mode; ///< Set if any bands have been encoded using intensity stereo
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uint8_t ms_mask[128]; ///< Set if mid/side stereo is used for each scalefactor window band
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uint8_t is_mask[128]; ///< Set if intensity stereo is used
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// shared
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SingleChannelElement ch[2];
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} ChannelElement;
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struct AACEncContext;
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typedef struct AACCoefficientsEncoder {
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void (*search_for_quantizers)(AVCodecContext *avctx, struct AACEncContext *s,
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SingleChannelElement *sce, const float lambda);
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void (*encode_window_bands_info)(struct AACEncContext *s, SingleChannelElement *sce,
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int win, int group_len, const float lambda);
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void (*quantize_and_encode_band)(struct AACEncContext *s, PutBitContext *pb, const float *in, float *out, int size,
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int scale_idx, int cb, const float lambda, int rtz);
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void (*encode_tns_info)(struct AACEncContext *s, SingleChannelElement *sce);
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void (*encode_ltp_info)(struct AACEncContext *s, SingleChannelElement *sce, int common_window);
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void (*encode_main_pred)(struct AACEncContext *s, SingleChannelElement *sce);
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void (*adjust_common_pred)(struct AACEncContext *s, ChannelElement *cpe);
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void (*adjust_common_ltp)(struct AACEncContext *s, ChannelElement *cpe);
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void (*apply_main_pred)(struct AACEncContext *s, SingleChannelElement *sce);
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void (*apply_tns_filt)(struct AACEncContext *s, SingleChannelElement *sce);
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void (*update_ltp)(struct AACEncContext *s, SingleChannelElement *sce);
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void (*ltp_insert_new_frame)(struct AACEncContext *s);
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void (*set_special_band_scalefactors)(struct AACEncContext *s, SingleChannelElement *sce);
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void (*search_for_pns)(struct AACEncContext *s, AVCodecContext *avctx, SingleChannelElement *sce);
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void (*mark_pns)(struct AACEncContext *s, AVCodecContext *avctx, SingleChannelElement *sce);
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void (*search_for_tns)(struct AACEncContext *s, SingleChannelElement *sce);
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void (*search_for_ltp)(struct AACEncContext *s, SingleChannelElement *sce, int common_window);
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void (*search_for_ms)(struct AACEncContext *s, ChannelElement *cpe);
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void (*search_for_is)(struct AACEncContext *s, AVCodecContext *avctx, ChannelElement *cpe);
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void (*search_for_pred)(struct AACEncContext *s, SingleChannelElement *sce);
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} AACCoefficientsEncoder;
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extern const AACCoefficientsEncoder ff_aac_coders[];
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typedef struct AACQuantizeBandCostCacheEntry {
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float rd;
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float energy;
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int bits;
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char cb;
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char rtz;
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uint16_t generation;
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} AACQuantizeBandCostCacheEntry;
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typedef struct AACPCEInfo {
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AVChannelLayout layout;
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int num_ele[4]; ///< front, side, back, lfe
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int pairing[3][8]; ///< front, side, back
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int index[4][8]; ///< front, side, back, lfe
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uint8_t config_map[16]; ///< configs the encoder's channel specific settings
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uint8_t reorder_map[16]; ///< maps channels from lavc to aac order
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} AACPCEInfo;
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/**
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* AAC encoder context
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*/
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typedef struct AACEncContext {
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AVClass *av_class;
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AACEncOptions options; ///< encoding options
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PutBitContext pb;
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AVTXContext *mdct1024; ///< long (1024 samples) frame transform context
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av_tx_fn mdct1024_fn;
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AVTXContext *mdct128; ///< short (128 samples) frame transform context
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av_tx_fn mdct128_fn;
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AVFloatDSPContext *fdsp;
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AACPCEInfo pce; ///< PCE data, if needed
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float *planar_samples[16]; ///< saved preprocessed input
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int profile; ///< copied from avctx
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int needs_pce; ///< flag for non-standard layout
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LPCContext lpc; ///< used by TNS
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int samplerate_index; ///< MPEG-4 samplerate index
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int channels; ///< channel count
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const uint8_t *reorder_map; ///< lavc to aac reorder map
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const uint8_t *chan_map; ///< channel configuration map
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ChannelElement *cpe; ///< channel elements
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FFPsyContext psy;
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struct FFPsyPreprocessContext* psypp;
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const AACCoefficientsEncoder *coder;
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int cur_channel; ///< current channel for coder context
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int random_state;
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float lambda;
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int last_frame_pb_count; ///< number of bits for the previous frame
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float lambda_sum; ///< sum(lambda), for Qvg reporting
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int lambda_count; ///< count(lambda), for Qvg reporting
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enum RawDataBlockType cur_type; ///< channel group type cur_channel belongs to
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AudioFrameQueue afq;
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DECLARE_ALIGNED(32, int, qcoefs)[96]; ///< quantized coefficients
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DECLARE_ALIGNED(32, float, scoefs)[1024]; ///< scaled coefficients
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uint16_t quantize_band_cost_cache_generation;
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AACQuantizeBandCostCacheEntry quantize_band_cost_cache[256][128]; ///< memoization area for quantize_band_cost
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AACEncDSPContext aacdsp;
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struct {
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float *samples;
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} buffer;
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} AACEncContext;
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void ff_quantize_band_cost_cache_init(struct AACEncContext *s);
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#endif /* AVCODEC_AACENC_H */
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