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https://git.ffmpeg.org/ffmpeg.git
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563 lines
18 KiB
C
563 lines
18 KiB
C
/*
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* AAC decoder definitions and structures
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* Copyright (c) 2005-2006 Oded Shimon ( ods15 ods15 dyndns org )
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* Copyright (c) 2006-2007 Maxim Gavrilov ( maxim.gavrilov gmail com )
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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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/**
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* @file
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* AAC decoder definitions and structures
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* @author Oded Shimon ( ods15 ods15 dyndns org )
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* @author Maxim Gavrilov ( maxim.gavrilov gmail com )
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*/
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#ifndef AVCODEC_AAC_AACDEC_H
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#define AVCODEC_AAC_AACDEC_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/fixed_dsp.h"
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#include "libavutil/mem_internal.h"
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#include "libavutil/tx.h"
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#include "libavcodec/aac.h"
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#include "libavcodec/avcodec.h"
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#include "libavcodec/mpeg4audio.h"
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#include "aacdec_ac.h"
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typedef struct AACDecContext AACDecContext;
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/**
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* Output configuration status
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*/
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enum OCStatus {
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OC_NONE, ///< Output unconfigured
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OC_TRIAL_PCE, ///< Output configuration under trial specified by an inband PCE
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OC_TRIAL_FRAME, ///< Output configuration under trial specified by a frame header
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OC_GLOBAL_HDR, ///< Output configuration set in a global header but not yet locked
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OC_LOCKED, ///< Output configuration locked in place
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};
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enum AACOutputChannelOrder {
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CHANNEL_ORDER_DEFAULT,
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CHANNEL_ORDER_CODED,
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};
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/**
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* The point during decoding at which channel coupling is applied.
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*/
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enum CouplingPoint {
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BEFORE_TNS,
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BETWEEN_TNS_AND_IMDCT,
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AFTER_IMDCT = 3,
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};
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enum AACUsacElem {
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ID_USAC_SCE = 0,
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ID_USAC_CPE = 1,
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ID_USAC_LFE = 2,
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ID_USAC_EXT = 3,
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};
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enum ExtensionHeaderType {
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ID_CONFIG_EXT_FILL = 0,
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ID_CONFIG_EXT_LOUDNESS_INFO = 2,
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ID_CONFIG_EXT_STREAM_ID = 7,
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};
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enum AACUsacExtension {
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ID_EXT_ELE_FILL,
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ID_EXT_ELE_MPEGS,
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ID_EXT_ELE_SAOC,
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ID_EXT_ELE_AUDIOPREROLL,
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ID_EXT_ELE_UNI_DRC,
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};
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enum AACUSACLoudnessExt {
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UNIDRCLOUDEXT_TERM = 0x0,
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UNIDRCLOUDEXT_EQ = 0x1,
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};
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// Supposed to be equal to AAC_RENAME() in case of USE_FIXED.
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#define RENAME_FIXED(name) name ## _fixed
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#define INTFLOAT_UNION(name, elems) \
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union { \
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int RENAME_FIXED(name) elems; \
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float name elems; \
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}
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#define INTFLOAT_ALIGNED_UNION(alignment, name, nb_elems) \
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union { \
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DECLARE_ALIGNED(alignment, int, RENAME_FIXED(name))[nb_elems]; \
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DECLARE_ALIGNED(alignment, float, name)[nb_elems]; \
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}
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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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INTFLOAT_UNION(coef,);
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int8_t used[MAX_LTP_LONG_SFB];
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} LongTermPrediction;
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/* Per channel core mode */
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typedef struct AACUsacElemData {
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uint8_t core_mode;
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uint8_t scale_factor_grouping;
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uint8_t tns_data_present;
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/* Timewarping ratio */
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#define NUM_TW_NODES 16
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uint8_t tw_ratio[NUM_TW_NODES];
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struct {
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uint8_t acelp_core_mode : 3;
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uint8_t lpd_mode : 5;
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uint8_t bpf_control_info : 1;
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uint8_t core_mode_last : 1;
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uint8_t fac_data_present : 1;
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int last_lpd_mode;
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} ldp;
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struct {
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unsigned int seed;
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uint8_t level : 3;
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uint8_t offset : 5;
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} noise;
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struct {
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uint8_t gain;
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uint32_t kv[8 /* (1024 / 16) / 8 */][8];
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} fac;
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AACArithState ac;
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} AACUsacElemData;
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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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int num_window_groups;
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int prev_num_window_groups; ///< Previous frame's number of window groups
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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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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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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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} 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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INTFLOAT_UNION(coef, [8][4][TNS_MAX_ORDER]);
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} TemporalNoiseShaping;
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/**
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* coupling parameters
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*/
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typedef struct ChannelCoupling {
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enum CouplingPoint coupling_point; ///< The point during decoding at which coupling is applied.
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int num_coupled; ///< number of target elements
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enum RawDataBlockType type[8]; ///< Type of channel element to be coupled - SCE or CPE.
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int id_select[8]; ///< element id
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int ch_select[8]; /**< [0] shared list of gains; [1] list of gains for right channel;
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* [2] list of gains for left channel; [3] lists of gains for both channels
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*/
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INTFLOAT_UNION(gain, [16][120]);
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} ChannelCoupling;
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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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AACUsacElemData ue; ///< USAC element data
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TemporalNoiseShaping tns;
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enum BandType band_type[128]; ///< band types
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int sfo[128]; ///< scalefactor offsets
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INTFLOAT_UNION(sf, [128]); ///< scalefactors (8 windows * 16 sfb max)
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INTFLOAT_ALIGNED_UNION(32, coeffs, 1024); ///< coefficients for IMDCT, maybe processed
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INTFLOAT_ALIGNED_UNION(32, prev_coeffs, 1024); ///< unscaled previous contents of coeffs[] for USAC
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INTFLOAT_ALIGNED_UNION(32, saved, 1536); ///< overlap
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INTFLOAT_ALIGNED_UNION(32, ret_buf, 2048); ///< PCM output buffer
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INTFLOAT_ALIGNED_UNION(16, ltp_state, 3072); ///< time signal for LTP
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union {
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struct PredictorStateFixed *RENAME_FIXED(predictor_state);
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struct PredictorState *predictor_state;
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};
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union {
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float *output; ///< PCM output
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int *RENAME_FIXED(output); ///< PCM output
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};
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} SingleChannelElement;
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typedef struct AACUsacStereo {
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uint8_t common_window;
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uint8_t common_tw;
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uint8_t tns_on_lr; ///< Apply TNS before M/S and stereo prediction
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uint8_t ms_mask_mode;
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uint8_t config_idx;
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/* Complex prediction */
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uint8_t use_prev_frame;
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uint8_t pred_dir;
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uint8_t complex_coef;
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uint8_t pred_used[128];
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INTFLOAT_ALIGNED_UNION(32, alpha_q_re, 1024);
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INTFLOAT_ALIGNED_UNION(32, alpha_q_im, 1024);
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INTFLOAT_ALIGNED_UNION(32, prev_alpha_q_re, 1024);
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INTFLOAT_ALIGNED_UNION(32, prev_alpha_q_im, 1024);
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INTFLOAT_ALIGNED_UNION(32, dmix_re, 1024);
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INTFLOAT_ALIGNED_UNION(32, prev_dmix_re, 1024); /* Recalculated on every frame */
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INTFLOAT_ALIGNED_UNION(32, dmix_im, 1024); /* Final prediction data */
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} AACUsacStereo;
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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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int present;
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// CPE specific
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uint8_t max_sfb_ste; ///< (USAC) Maximum of both max_sfb values
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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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// shared
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SingleChannelElement ch[2];
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// CCE specific
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ChannelCoupling coup;
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// USAC stereo coupling data
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AACUsacStereo us;
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} ChannelElement;
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typedef struct AACUSACLoudnessInfo {
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uint8_t drc_set_id : 6;
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uint8_t downmix_id : 7;
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struct {
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uint16_t lvl : 12;
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uint8_t present : 1;
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} sample_peak;
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struct {
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uint16_t lvl : 12;
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uint8_t measurement : 4;
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uint8_t reliability : 2;
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uint8_t present : 1;
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} true_peak;
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uint8_t nb_measurements : 4;
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struct {
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uint8_t method_def : 4;
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uint8_t method_val;
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uint8_t measurement : 4;
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uint8_t reliability : 2;
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} measurements[16];
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} AACUSACLoudnessInfo;
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typedef struct AACUsacElemConfig {
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enum AACUsacElem type;
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uint8_t tw_mdct : 1;
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uint8_t noise_fill : 1;
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uint8_t stereo_config_index;
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struct {
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int ratio;
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uint8_t harmonic_sbr : 1; /* harmonicSBR */
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uint8_t bs_intertes : 1; /* bs_interTes */
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uint8_t bs_pvc : 1; /* bs_pvc */
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struct {
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uint8_t start_freq; /* dflt_start_freq */
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uint8_t stop_freq; /* dflt_stop_freq */
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uint8_t freq_scale; /* dflt_freq_scale */
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uint8_t alter_scale : 1; /* dflt_alter_scale */
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uint8_t noise_bands; /* dflt_noise_bands */
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uint8_t limiter_bands; /* dflt_limiter_bands */
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uint8_t limiter_gains; /* dflt_limiter_gains */
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uint8_t interpol_freq : 1; /* dflt_interpol_freq */
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uint8_t smoothing_mode : 1; /* dflt_smoothing_mode */
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} dflt;
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} sbr;
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struct {
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uint8_t freq_res; /* bsFreqRes */
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uint8_t fixed_gain; /* bsFixedGainDMX */
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uint8_t temp_shape_config; /* bsTempShapeConfig */
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uint8_t decorr_config; /* bsDecorrConfig */
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uint8_t high_rate_mode : 1; /* bsHighRateMode */
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uint8_t phase_coding : 1; /* bsPhaseCoding */
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uint8_t otts_bands_phase; /* bsOttBandsPhase */
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uint8_t residual_coding; /* bsResidualCoding */
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uint8_t residual_bands; /* bsResidualBands */
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uint8_t pseudo_lr : 1; /* bsPseudoLr */
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uint8_t env_quant_mode : 1; /* bsEnvQuantMode */
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} mps;
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struct {
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enum AACUsacExtension type;
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uint8_t payload_frag;
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uint32_t default_len;
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uint32_t pl_data_offset;
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uint8_t *pl_data;
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} ext;
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} AACUsacElemConfig;
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typedef struct AACUSACConfig {
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uint8_t core_sbr_frame_len_idx; /* coreSbrFrameLengthIndex */
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uint16_t core_frame_len;
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uint16_t stream_identifier;
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AACUsacElemConfig elems[64];
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int nb_elems;
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struct {
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uint8_t nb_album;
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AACUSACLoudnessInfo album_info[64];
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uint8_t nb_info;
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AACUSACLoudnessInfo info[64];
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} loudness;
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} AACUSACConfig;
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typedef struct OutputConfiguration {
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MPEG4AudioConfig m4ac;
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uint8_t layout_map[MAX_ELEM_ID*4][3];
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int layout_map_tags;
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AVChannelLayout ch_layout;
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enum OCStatus status;
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AACUSACConfig usac;
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} OutputConfiguration;
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/**
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* Dynamic Range Control - decoded from the bitstream but not processed further.
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*/
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typedef struct DynamicRangeControl {
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int pce_instance_tag; ///< Indicates with which program the DRC info is associated.
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int dyn_rng_sgn[17]; ///< DRC sign information; 0 - positive, 1 - negative
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int dyn_rng_ctl[17]; ///< DRC magnitude information
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int exclude_mask[MAX_CHANNELS]; ///< Channels to be excluded from DRC processing.
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int band_incr; ///< Number of DRC bands greater than 1 having DRC info.
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int interpolation_scheme; ///< Indicates the interpolation scheme used in the SBR QMF domain.
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int band_top[17]; ///< Indicates the top of the i-th DRC band in units of 4 spectral lines.
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int prog_ref_level; /**< A reference level for the long-term program audio level for all
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* channels combined.
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*/
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} DynamicRangeControl;
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/**
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* Decode-specific primitives
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*/
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typedef struct AACDecProc {
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int (*decode_spectrum_and_dequant)(AACDecContext *ac,
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GetBitContext *gb,
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const Pulse *pulse,
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SingleChannelElement *sce);
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int (*decode_cce)(AACDecContext *ac, GetBitContext *gb, ChannelElement *che);
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int (*sbr_ctx_alloc_init)(AACDecContext *ac, ChannelElement **che, int id_aac);
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int (*sbr_decode_extension)(AACDecContext *ac, ChannelElement *che,
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GetBitContext *gb, int crc, int cnt, int id_aac);
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void (*sbr_apply)(AACDecContext *ac, ChannelElement *che,
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int id_aac, void /* INTFLOAT */ *L, void /* INTFLOAT */ *R);
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void (*sbr_ctx_close)(ChannelElement *che);
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} AACDecProc;
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/**
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* DSP-specific primitives
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*/
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typedef struct AACDecDSP {
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void (*dequant_scalefactors)(SingleChannelElement *sce);
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void (*apply_mid_side_stereo)(AACDecContext *ac, ChannelElement *cpe);
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void (*apply_intensity_stereo)(AACDecContext *ac, ChannelElement *cpe,
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int ms_present);
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void (*apply_tns)(void *_coef_param, TemporalNoiseShaping *tns,
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IndividualChannelStream *ics, int decode);
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void (*apply_ltp)(AACDecContext *ac, SingleChannelElement *sce);
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void (*update_ltp)(AACDecContext *ac, SingleChannelElement *sce);
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void (*apply_prediction)(AACDecContext *ac, SingleChannelElement *sce);
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void (*apply_dependent_coupling)(AACDecContext *ac,
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SingleChannelElement *target,
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ChannelElement *cce, int index);
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void (*apply_independent_coupling)(AACDecContext *ac,
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SingleChannelElement *target,
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ChannelElement *cce, int index);
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void (*imdct_and_windowing)(AACDecContext *ac, SingleChannelElement *sce);
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void (*imdct_and_windowing_768)(AACDecContext *ac, SingleChannelElement *sce);
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void (*imdct_and_windowing_960)(AACDecContext *ac, SingleChannelElement *sce);
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void (*imdct_and_windowing_ld)(AACDecContext *ac, SingleChannelElement *sce);
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void (*imdct_and_windowing_eld)(AACDecContext *ac, SingleChannelElement *sce);
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void (*clip_output)(AACDecContext *ac, ChannelElement *che, int type, int samples);
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} AACDecDSP;
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/**
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* main AAC decoding context
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*/
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struct AACDecContext {
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const struct AVClass *class;
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struct AVCodecContext *avctx;
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AACDecDSP dsp;
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AACDecProc proc;
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struct AVFrame *frame;
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int is_saved; ///< Set if elements have stored overlap from previous frame.
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DynamicRangeControl che_drc;
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/**
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* @name Channel element related data
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* @{
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*/
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ChannelElement *che[4][MAX_ELEM_ID];
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ChannelElement *tag_che_map[4][MAX_ELEM_ID];
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int tags_mapped;
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int warned_remapping_once;
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/** @} */
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/**
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* @name temporary aligned temporary buffers
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* (We do not want to have these on the stack.)
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* @{
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*/
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INTFLOAT_ALIGNED_UNION(32, buf_mdct, 1024);
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INTFLOAT_ALIGNED_UNION(32, temp, 128);
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/** @} */
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/**
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* @name Computed / set up during initialization
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* @{
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*/
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AVTXContext *mdct96;
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AVTXContext *mdct120;
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AVTXContext *mdct128;
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AVTXContext *mdct480;
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AVTXContext *mdct512;
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AVTXContext *mdct768;
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AVTXContext *mdct960;
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AVTXContext *mdct1024;
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AVTXContext *mdct_ltp;
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av_tx_fn mdct96_fn;
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av_tx_fn mdct120_fn;
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av_tx_fn mdct128_fn;
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av_tx_fn mdct480_fn;
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av_tx_fn mdct512_fn;
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av_tx_fn mdct768_fn;
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av_tx_fn mdct960_fn;
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av_tx_fn mdct1024_fn;
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av_tx_fn mdct_ltp_fn;
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union {
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AVFixedDSPContext *RENAME_FIXED(fdsp);
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AVFloatDSPContext *fdsp;
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};
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int random_state;
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/** @} */
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|
|
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/**
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* @name Members used for output
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|
* @{
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|
*/
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|
SingleChannelElement *output_element[MAX_CHANNELS]; ///< Points to each SingleChannelElement
|
|
/** @} */
|
|
|
|
|
|
/**
|
|
* @name Japanese DTV specific extension
|
|
* @{
|
|
*/
|
|
int force_dmono_mode;///< 0->not dmono, 1->use first channel, 2->use second channel
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|
int dmono_mode; ///< 0->not dmono, 1->use first channel, 2->use second channel
|
|
/** @} */
|
|
|
|
enum AACOutputChannelOrder output_channel_order;
|
|
|
|
OutputConfiguration oc[2];
|
|
int warned_num_aac_frames;
|
|
int warned_960_sbr;
|
|
unsigned warned_71_wide;
|
|
int warned_gain_control;
|
|
int warned_he_aac_mono;
|
|
|
|
int is_fixed;
|
|
};
|
|
|
|
#if defined(USE_FIXED) && USE_FIXED
|
|
#define fdsp RENAME_FIXED(fdsp)
|
|
#endif
|
|
|
|
int ff_aac_decode_init(AVCodecContext *avctx);
|
|
int ff_aac_decode_init_float(AVCodecContext *avctx);
|
|
int ff_aac_decode_init_fixed(AVCodecContext *avctx);
|
|
|
|
int ff_aac_decode_ics(AACDecContext *ac, SingleChannelElement *sce,
|
|
GetBitContext *gb, int common_window, int scale_flag);
|
|
|
|
int ff_aac_decode_tns(AACDecContext *ac, TemporalNoiseShaping *tns,
|
|
GetBitContext *gb, const IndividualChannelStream *ics);
|
|
|
|
int ff_aac_set_default_channel_config(AACDecContext *ac, AVCodecContext *avctx,
|
|
uint8_t (*layout_map)[3],
|
|
int *tags,
|
|
int channel_config);
|
|
|
|
int ff_aac_output_configure(AACDecContext *ac,
|
|
uint8_t layout_map[MAX_ELEM_ID * 4][3], int tags,
|
|
enum OCStatus oc_type, int get_new_frame);
|
|
|
|
ChannelElement *ff_aac_get_che(AACDecContext *ac, int type, int elem_id);
|
|
|
|
#endif /* AVCODEC_AAC_AACDEC_H */
|