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Diffstat (limited to 'ffmpeg1/libavcodec/aac.h')
| -rw-r--r-- | ffmpeg1/libavcodec/aac.h | 333 |
1 files changed, 0 insertions, 333 deletions
diff --git a/ffmpeg1/libavcodec/aac.h b/ffmpeg1/libavcodec/aac.h deleted file mode 100644 index d586e27..0000000 --- a/ffmpeg1/libavcodec/aac.h +++ /dev/null @@ -1,333 +0,0 @@ -/* - * AAC 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 definitions and structures - * @author Oded Shimon ( ods15 ods15 dyndns org ) - * @author Maxim Gavrilov ( maxim.gavrilov gmail com ) - */ - -#ifndef AVCODEC_AAC_H -#define AVCODEC_AAC_H - -#include "libavutil/float_dsp.h" -#include "avcodec.h" -#include "fft.h" -#include "mpeg4audio.h" -#include "sbr.h" -#include "fmtconvert.h" - -#include <stdint.h> - -#define MAX_CHANNELS 64 -#define MAX_ELEM_ID 16 - -#define TNS_MAX_ORDER 20 -#define MAX_LTP_LONG_SFB 40 - -enum RawDataBlockType { - TYPE_SCE, - TYPE_CPE, - TYPE_CCE, - TYPE_LFE, - TYPE_DSE, - TYPE_PCE, - TYPE_FIL, - TYPE_END, -}; - -enum ExtensionPayloadID { - EXT_FILL, - EXT_FILL_DATA, - EXT_DATA_ELEMENT, - EXT_DYNAMIC_RANGE = 0xb, - EXT_SBR_DATA = 0xd, - EXT_SBR_DATA_CRC = 0xe, -}; - -enum WindowSequence { - ONLY_LONG_SEQUENCE, - LONG_START_SEQUENCE, - EIGHT_SHORT_SEQUENCE, - LONG_STOP_SEQUENCE, -}; - -enum BandType { - ZERO_BT = 0, ///< Scalefactors and spectral data are all zero. - FIRST_PAIR_BT = 5, ///< This and later band types encode two values (rather than four) with one code word. - ESC_BT = 11, ///< Spectral data are coded with an escape sequence. - NOISE_BT = 13, ///< Spectral data are scaled white noise not coded in the bitstream. - INTENSITY_BT2 = 14, ///< Scalefactor data are intensity stereo positions. - INTENSITY_BT = 15, ///< Scalefactor data are intensity stereo positions. -}; - -#define IS_CODEBOOK_UNSIGNED(x) ((x - 1) & 10) - -enum ChannelPosition { - AAC_CHANNEL_OFF = 0, - AAC_CHANNEL_FRONT = 1, - AAC_CHANNEL_SIDE = 2, - AAC_CHANNEL_BACK = 3, - AAC_CHANNEL_LFE = 4, - AAC_CHANNEL_CC = 5, -}; - -/** - * The point during decoding at which channel coupling is applied. - */ -enum CouplingPoint { - BEFORE_TNS, - BETWEEN_TNS_AND_IMDCT, - AFTER_IMDCT = 3, -}; - -/** - * 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 -}; - -typedef struct OutputConfiguration { - MPEG4AudioConfig m4ac; - uint8_t layout_map[MAX_ELEM_ID*4][3]; - int layout_map_tags; - int channels; - uint64_t channel_layout; - enum OCStatus status; -} OutputConfiguration; - -/** - * Predictor State - */ -typedef struct PredictorState { - float cor0; - float cor1; - float var0; - float var1; - float r0; - float r1; -} PredictorState; - -#define MAX_PREDICTORS 672 - -#define SCALE_DIV_512 36 ///< scalefactor difference that corresponds to scale difference in 512 times -#define SCALE_ONE_POS 140 ///< scalefactor index that corresponds to scale=1.0 -#define SCALE_MAX_POS 255 ///< scalefactor index maximum value -#define SCALE_MAX_DIFF 60 ///< maximum scalefactor difference allowed by standard -#define SCALE_DIFF_ZERO 60 ///< codebook index corresponding to zero scalefactor indices difference - -/** - * Long Term Prediction - */ -typedef struct LongTermPrediction { - int8_t present; - int16_t lag; - float 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 sinus 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 - const uint8_t *swb_sizes; ///< table of scalefactor band sizes 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]; -} 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]; - float coef[8][4][TNS_MAX_ORDER]; -} TemporalNoiseShaping; - -/** - * 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; - -typedef struct Pulse { - int num_pulse; - int start; - int pos[4]; - int amp[4]; -} Pulse; - -/** - * 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 - */ - float gain[16][120]; -} ChannelCoupling; - -/** - * Single Channel Element - used for both SCE and LFE elements. - */ -typedef struct SingleChannelElement { - IndividualChannelStream ics; - TemporalNoiseShaping tns; - Pulse pulse; - enum BandType band_type[128]; ///< band types - int band_type_run_end[120]; ///< band type run end points - float sf[120]; ///< scalefactors - int sf_idx[128]; ///< scalefactor indices (used by encoder) - uint8_t zeroes[128]; ///< band is not coded (used by encoder) - DECLARE_ALIGNED(32, float, coeffs)[1024]; ///< coefficients for IMDCT - DECLARE_ALIGNED(32, float, saved)[1024]; ///< overlap - DECLARE_ALIGNED(32, float, ret_buf)[2048]; ///< PCM output buffer - DECLARE_ALIGNED(16, float, ltp_state)[3072]; ///< time signal for LTP - PredictorState predictor_state[MAX_PREDICTORS]; - float *ret; ///< PCM output -} SingleChannelElement; - -/** - * channel element - generic struct for SCE/CPE/CCE/LFE - */ -typedef struct ChannelElement { - // CPE specific - int common_window; ///< Set if channels share a common 'IndividualChannelStream' in bitstream. - int ms_mode; ///< Signals mid/side stereo flags coding mode (used by encoder) - 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; - SpectralBandReplication sbr; -} ChannelElement; - -/** - * main AAC context - */ -struct AACContext { - AVClass *class; - AVCodecContext *avctx; - 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; - /** @} */ - - /** - * @name temporary aligned temporary buffers - * (We do not want to have these on the stack.) - * @{ - */ - DECLARE_ALIGNED(32, float, buf_mdct)[1024]; - /** @} */ - - /** - * @name Computed / set up during initialization - * @{ - */ - FFTContext mdct; - FFTContext mdct_small; - FFTContext mdct_ltp; - FmtConvertContext fmt_conv; - 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 - /** @} */ - - DECLARE_ALIGNED(32, float, temp)[128]; - - OutputConfiguration oc[2]; - int warned_num_aac_frames; - - /* aacdec functions pointers */ - void (*imdct_and_windowing)(AACContext *ac, SingleChannelElement *sce); - void (*apply_ltp)(AACContext *ac, SingleChannelElement *sce); - void (*apply_tns)(float coef[1024], TemporalNoiseShaping *tns, - IndividualChannelStream *ics, int decode); - void (*windowing_and_mdct_ltp)(AACContext *ac, float *out, - float *in, IndividualChannelStream *ics); - void (*update_ltp)(AACContext *ac, SingleChannelElement *sce); - -}; - -void ff_aacdec_init_mips(AACContext *c); - -#endif /* AVCODEC_AAC_H */ |