| /* |
| * 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 |
| |
| #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. |
| RESERVED_BT = 12, ///< Band types following are encoded differently from others. |
| NOISE_BT = 13, ///< Spectral data are scaled white noise not coded in the bitstream. |
| INTENSITY_BT2 = 14, ///< Scalefactor data are intensity stereo positions (out of phase). |
| INTENSITY_BT = 15, ///< Scalefactor data are intensity stereo positions (in phase). |
| }; |
| |
| 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, |
| }; |
| |
| #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 |
| |
| #define POW_SF2_ZERO 200 ///< ff_aac_pow2sf_tab index corresponding to pow(2, 0); |
| |
| #define NOISE_PRE 256 ///< preamble for NOISE_BT, put in bitstream with the first noise band |
| #define NOISE_PRE_BITS 9 ///< length of preamble |
| #define NOISE_OFFSET 90 ///< subtracted from global gain, used as offset for the preamble |
| |
| typedef struct Pulse { |
| int num_pulse; |
| int start; |
| int pos[4]; |
| int amp[4]; |
| } Pulse; |
| |
| #endif /* AVCODEC_AAC_H */ |