/* * AAC decoder definitions and structures * Copyright (c) 2005-2006 Oded Shimon ( ods15 ods15 dyndns org ) * Copyright (c) 2006-2007 Maxim Gavrilov ( maxim.gavrilov 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 * AAC decoder definitions and structures * @author Oded Shimon ( ods15 ods15 dyndns org ) * @author Maxim Gavrilov ( maxim.gavrilov gmail com ) */ #ifndef AVCODEC_AACDEC_H #define AVCODEC_AACDEC_H #include #include "libavutil/channel_layout.h" #include "libavutil/float_dsp.h" #include "libavutil/fixed_dsp.h" #include "libavutil/mem_internal.h" #include "libavutil/tx.h" #include "aac.h" #include "mpeg4audio.h" typedef struct AACDecContext AACDecContext; /** * Output configuration status */ enum OCStatus { OC_NONE, ///< Output unconfigured OC_TRIAL_PCE, ///< Output configuration under trial specified by an inband PCE OC_TRIAL_FRAME, ///< Output configuration under trial specified by a frame header OC_GLOBAL_HDR, ///< Output configuration set in a global header but not yet locked OC_LOCKED, ///< Output configuration locked in place }; enum AACOutputChannelOrder { CHANNEL_ORDER_DEFAULT, CHANNEL_ORDER_CODED, }; /** * The point during decoding at which channel coupling is applied. */ enum CouplingPoint { BEFORE_TNS, BETWEEN_TNS_AND_IMDCT, AFTER_IMDCT = 3, }; // Supposed to be equal to AAC_RENAME() in case of USE_FIXED. #define RENAME_FIXED(name) name ## _fixed #define INTFLOAT_UNION(name, elems) \ union { \ int RENAME_FIXED(name) elems; \ float name elems; \ }; #define INTFLOAT_ALIGNED_UNION(alignment, name, nb_elems) \ union { \ DECLARE_ALIGNED(alignment, int, RENAME_FIXED(name))[nb_elems]; \ DECLARE_ALIGNED(alignment, float, name)[nb_elems]; \ }; /** * Long Term Prediction */ typedef struct LongTermPrediction { int8_t present; int16_t lag; INTFLOAT_UNION(coef,); int8_t used[MAX_LTP_LONG_SFB]; } LongTermPrediction; /** * Individual Channel Stream */ typedef struct IndividualChannelStream { uint8_t max_sfb; ///< number of scalefactor bands per group enum WindowSequence window_sequence[2]; uint8_t use_kb_window[2]; ///< If set, use Kaiser-Bessel window, otherwise use a sine window. int num_window_groups; uint8_t group_len[8]; LongTermPrediction ltp; const uint16_t *swb_offset; ///< table of offsets to the lowest spectral coefficient of a scalefactor band, sfb, for a particular window int num_swb; ///< number of scalefactor window bands int num_windows; int tns_max_bands; int predictor_present; int predictor_initialized; int predictor_reset_group; uint8_t prediction_used[41]; uint8_t window_clipping[8]; ///< set if a certain window is near clipping } IndividualChannelStream; /** * Temporal Noise Shaping */ typedef struct TemporalNoiseShaping { int present; int n_filt[8]; int length[8][4]; int direction[8][4]; int order[8][4]; INTFLOAT_UNION(coef, [8][4][TNS_MAX_ORDER]); } TemporalNoiseShaping; /** * coupling parameters */ typedef struct ChannelCoupling { enum CouplingPoint coupling_point; ///< The point during decoding at which coupling is applied. int num_coupled; ///< number of target elements enum RawDataBlockType type[8]; ///< Type of channel element to be coupled - SCE or CPE. int id_select[8]; ///< element id int ch_select[8]; /**< [0] shared list of gains; [1] list of gains for right channel; * [2] list of gains for left channel; [3] lists of gains for both channels */ INTFLOAT_UNION(gain, [16][120]); } ChannelCoupling; /** * Single Channel Element - used for both SCE and LFE elements. */ typedef struct SingleChannelElement { IndividualChannelStream ics; TemporalNoiseShaping tns; enum BandType band_type[128]; ///< band types int band_type_run_end[120]; ///< band type run end points int sfo[120]; ///< scalefactor offsets INTFLOAT_UNION(sf, [120]); ///< scalefactors INTFLOAT_ALIGNED_UNION(32, coeffs, 1024); ///< coefficients for IMDCT, maybe processed INTFLOAT_ALIGNED_UNION(32, saved, 1536); ///< overlap INTFLOAT_ALIGNED_UNION(32, ret_buf, 2048); ///< PCM output buffer INTFLOAT_ALIGNED_UNION(16, ltp_state, 3072); ///< time signal for LTP union { struct PredictorStateFixed *RENAME_FIXED(predictor_state); struct PredictorState *predictor_state; }; union { float *output; ///< PCM output int *RENAME_FIXED(output); ///< PCM output }; } SingleChannelElement; /** * channel element - generic struct for SCE/CPE/CCE/LFE */ typedef struct ChannelElement { int present; // CPE specific uint8_t ms_mask[128]; ///< Set if mid/side stereo is used for each scalefactor window band // shared SingleChannelElement ch[2]; // CCE specific ChannelCoupling coup; } ChannelElement; typedef struct OutputConfiguration { MPEG4AudioConfig m4ac; uint8_t layout_map[MAX_ELEM_ID*4][3]; int layout_map_tags; AVChannelLayout ch_layout; enum OCStatus status; } OutputConfiguration; /** * Dynamic Range Control - decoded from the bitstream but not processed further. */ typedef struct DynamicRangeControl { int pce_instance_tag; ///< Indicates with which program the DRC info is associated. int dyn_rng_sgn[17]; ///< DRC sign information; 0 - positive, 1 - negative int dyn_rng_ctl[17]; ///< DRC magnitude information int exclude_mask[MAX_CHANNELS]; ///< Channels to be excluded from DRC processing. int band_incr; ///< Number of DRC bands greater than 1 having DRC info. int interpolation_scheme; ///< Indicates the interpolation scheme used in the SBR QMF domain. int band_top[17]; ///< Indicates the top of the i-th DRC band in units of 4 spectral lines. int prog_ref_level; /**< A reference level for the long-term program audio level for all * channels combined. */ } DynamicRangeControl; /** * Decode-specific primitives */ typedef struct AACDecProc { int (*decode_spectrum_and_dequant)(AACDecContext *ac, GetBitContext *gb, const Pulse *pulse, SingleChannelElement *sce); } AACDecProc; /** * DSP-specific primitives */ typedef struct AACDecDSP { void (*init_tables)(void); void (*dequant_scalefactors)(SingleChannelElement *sce); void (*apply_mid_side_stereo)(AACDecContext *ac, ChannelElement *cpe); void (*apply_intensity_stereo)(AACDecContext *ac, ChannelElement *cpe, int ms_present); void (*apply_tns)(void *_coef_param, TemporalNoiseShaping *tns, IndividualChannelStream *ics, int decode); void (*apply_ltp)(AACDecContext *ac, SingleChannelElement *sce); void (*update_ltp)(AACDecContext *ac, SingleChannelElement *sce); void (*imdct_and_windowing)(AACDecContext *ac, SingleChannelElement *sce); void (*imdct_and_windowing_960)(AACDecContext *ac, SingleChannelElement *sce); void (*imdct_and_windowing_ld)(AACDecContext *ac, SingleChannelElement *sce); void (*imdct_and_windowing_eld)(AACDecContext *ac, SingleChannelElement *sce); } AACDecDSP; /** * main AAC decoding context */ struct AACDecContext { const struct AVClass *class; struct AVCodecContext *avctx; AACDecDSP dsp; AACDecProc proc; struct AVFrame *frame; int is_saved; ///< Set if elements have stored overlap from previous frame. DynamicRangeControl che_drc; /** * @name Channel element related data * @{ */ ChannelElement *che[4][MAX_ELEM_ID]; ChannelElement *tag_che_map[4][MAX_ELEM_ID]; int tags_mapped; int warned_remapping_once; /** @} */ /** * @name temporary aligned temporary buffers * (We do not want to have these on the stack.) * @{ */ INTFLOAT_ALIGNED_UNION(32, buf_mdct, 1024); INTFLOAT_ALIGNED_UNION(32, temp, 128); /** @} */ /** * @name Computed / set up during initialization * @{ */ AVTXContext *mdct120; AVTXContext *mdct128; AVTXContext *mdct480; AVTXContext *mdct512; AVTXContext *mdct960; AVTXContext *mdct1024; AVTXContext *mdct_ltp; av_tx_fn mdct120_fn; av_tx_fn mdct128_fn; av_tx_fn mdct480_fn; av_tx_fn mdct512_fn; av_tx_fn mdct960_fn; av_tx_fn mdct1024_fn; av_tx_fn mdct_ltp_fn; union { AVFixedDSPContext *RENAME_FIXED(fdsp); AVFloatDSPContext *fdsp; }; int random_state; /** @} */ /** * @name Members used for output * @{ */ 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 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 extern const struct AVClass ff_aac_decoder_class; int ff_aac_decode_init_common(struct AVCodecContext *avctx); int ff_aac_decode_close(struct AVCodecContext *avctx); void ff_aacdec_init_mips(AACDecContext *c); #endif /* AVCODEC_AACDEC_H */