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FFmpeg
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#include "aac_defines.h"Go to the source code of this file.
Data Structures | |
| struct | PredictorState |
| Predictor State. More... | |
| struct | Pulse |
Macros | |
| #define | MAX_CHANNELS 64 |
| #define | MAX_ELEM_ID 16 |
| #define | TNS_MAX_ORDER 20 |
| #define | MAX_LTP_LONG_SFB 40 |
| #define | MAX_PREDICTORS 672 |
| #define | SCALE_DIV_512 36 |
| scalefactor difference that corresponds to scale difference in 512 times More... | |
| #define | SCALE_ONE_POS 140 |
| scalefactor index that corresponds to scale=1.0 More... | |
| #define | SCALE_MAX_POS 255 |
| scalefactor index maximum value More... | |
| #define | SCALE_MAX_DIFF 60 |
| maximum scalefactor difference allowed by standard More... | |
| #define | SCALE_DIFF_ZERO 60 |
| codebook index corresponding to zero scalefactor indices difference More... | |
| #define | POW_SF2_ZERO 200 |
| ff_aac_pow2sf_tab index corresponding to pow(2, 0); More... | |
| #define | NOISE_PRE 256 |
| preamble for NOISE_BT, put in bitstream with the first noise band More... | |
| #define | NOISE_PRE_BITS 9 |
| length of preamble More... | |
| #define | NOISE_OFFSET 90 |
| subtracted from global gain, used as offset for the preamble More... | |
Enumerations | |
| 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, FIRST_PAIR_BT = 5, ESC_BT = 11, RESERVED_BT = 12, NOISE_BT = 13, INTENSITY_BT2 = 14, INTENSITY_BT = 15 } |
| 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 } |
AAC definitions and structures
Definition in file aac.h.
| #define SCALE_DIV_512 36 |
| #define SCALE_ONE_POS 140 |
| #define SCALE_MAX_DIFF 60 |
| #define SCALE_DIFF_ZERO 60 |
| #define POW_SF2_ZERO 200 |
| #define NOISE_PRE 256 |
| #define NOISE_OFFSET 90 |
| enum RawDataBlockType |
| enum ExtensionPayloadID |
| enum WindowSequence |
| enum BandType |
| Enumerator | |
|---|---|
| ZERO_BT | Scalefactors and spectral data are all zero. |
| FIRST_PAIR_BT | This and later band types encode two values (rather than four) with one code word. |
| ESC_BT | Spectral data are coded with an escape sequence. |
| RESERVED_BT | Band types following are encoded differently from others. |
| NOISE_BT | Spectral data are scaled white noise not coded in the bitstream. |
| INTENSITY_BT2 | Scalefactor data are intensity stereo positions (out of phase). |
| INTENSITY_BT | Scalefactor data are intensity stereo positions (in phase). |
| enum ChannelPosition |
1.8.17