#include <stdint.h>#include "dsputil.h"Go to the source code of this file.
Data Structures | |
| struct | LPCContext |
Defines | |
| #define | ORDER_METHOD_EST 0 |
| LPC utility code Copyright (c) 2006 Justin Ruggles <justin.ruggles@gmail.com>. | |
| #define | ORDER_METHOD_2LEVEL 1 |
| #define | ORDER_METHOD_4LEVEL 2 |
| #define | ORDER_METHOD_8LEVEL 3 |
| #define | ORDER_METHOD_SEARCH 4 |
| #define | ORDER_METHOD_LOG 5 |
| #define | MIN_LPC_ORDER 1 |
| #define | MAX_LPC_ORDER 32 |
| #define | LPC_TYPE float |
Enumerations | |
| enum | FFLPCType { FF_LPC_TYPE_DEFAULT = -1, FF_LPC_TYPE_NONE = 0, FF_LPC_TYPE_FIXED = 1, FF_LPC_TYPE_LEVINSON = 2, FF_LPC_TYPE_CHOLESKY = 3, FF_LPC_TYPE_NB } |
| LPC analysis type. More... | |
Functions | |
| int | ff_lpc_calc_coefs (LPCContext *s, const int32_t *samples, int blocksize, int min_order, int max_order, int precision, int32_t coefs[][MAX_LPC_ORDER], int *shift, enum FFLPCType lpc_type, int lpc_passes, int omethod, int max_shift, int zero_shift) |
| Calculate LPC coefficients for multiple orders. | |
| int | ff_lpc_init (LPCContext *s, int blocksize, int max_order, enum FFLPCType lpc_type) |
| Initialize LPCContext. | |
| void | ff_lpc_init_x86 (LPCContext *s) |
| void | ff_lpc_end (LPCContext *s) |
| Uninitialize LPCContext. | |
| static int | compute_lpc_coefs (const LPC_TYPE *autoc, int max_order, LPC_TYPE *lpc, int lpc_stride, int fail, int normalize) |
| Levinson-Durbin recursion. | |
| #define LPC_TYPE float |
| #define MAX_LPC_ORDER 32 |
Definition at line 36 of file lpc.h.
Referenced by calc_predictor_params(), encode_residual_ch(), flac_encode_init(), and ra144_encode_frame().
| #define MIN_LPC_ORDER 1 |
Definition at line 35 of file lpc.h.
Referenced by alac_encode_init(), ff_lpc_calc_coefs(), and flac_encode_init().
| #define ORDER_METHOD_2LEVEL 1 |
Definition at line 29 of file lpc.h.
Referenced by dprint_compression_options(), and encode_residual_ch().
| #define ORDER_METHOD_4LEVEL 2 |
Definition at line 30 of file lpc.h.
Referenced by dprint_compression_options(), encode_residual_ch(), and flac_encode_init().
| #define ORDER_METHOD_8LEVEL 3 |
Definition at line 31 of file lpc.h.
Referenced by dprint_compression_options(), and encode_residual_ch().
| #define ORDER_METHOD_EST 0 |
LPC utility code Copyright (c) 2006 Justin Ruggles <justin.ruggles@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
Definition at line 28 of file lpc.h.
Referenced by calc_predictor_params(), dprint_compression_options(), ff_lpc_calc_coefs(), flac_encode_init(), and ra144_encode_frame().
| #define ORDER_METHOD_LOG 5 |
Definition at line 33 of file lpc.h.
Referenced by dprint_compression_options(), encode_residual_ch(), and flac_encode_init().
| #define ORDER_METHOD_SEARCH 4 |
Definition at line 32 of file lpc.h.
Referenced by dprint_compression_options(), encode_residual_ch(), and flac_encode_init().
| enum FFLPCType |
LPC analysis type.
| static int compute_lpc_coefs | ( | const LPC_TYPE * | autoc, | |
| int | max_order, | |||
| LPC_TYPE * | lpc, | |||
| int | lpc_stride, | |||
| int | fail, | |||
| int | normalize | |||
| ) | [inline, static] |
Levinson-Durbin recursion.
Produce LPC coefficients from autocorrelation data.
Definition at line 116 of file lpc.h.
Referenced by apply_tns(), backward_filter(), and ff_lpc_calc_coefs().
| int ff_lpc_calc_coefs | ( | LPCContext * | s, | |
| const int32_t * | samples, | |||
| int | blocksize, | |||
| int | min_order, | |||
| int | max_order, | |||
| int | precision, | |||
| int32_t | coefs[][MAX_LPC_ORDER], | |||
| int * | shift, | |||
| enum FFLPCType | lpc_type, | |||
| int | lpc_passes, | |||
| int | omethod, | |||
| int | max_shift, | |||
| int | zero_shift | |||
| ) |
Calculate LPC coefficients for multiple orders.
| lpc_type | LPC method for determining coefficients, see FFLPCType for details |
Definition at line 156 of file lpc.c.
Referenced by calc_predictor_params(), encode_residual_ch(), and ra144_encode_frame().
| void ff_lpc_end | ( | LPCContext * | s | ) |
Uninitialize LPCContext.
Definition at line 267 of file lpc.c.
Referenced by alac_encode_close(), ff_lpc_calc_coefs(), flac_encode_close(), and ra144_encode_close().
| int ff_lpc_init | ( | LPCContext * | s, | |
| int | blocksize, | |||
| int | max_order, | |||
| enum FFLPCType | lpc_type | |||
| ) |
Initialize LPCContext.
Definition at line 242 of file lpc.c.
Referenced by alac_encode_init(), ff_lpc_calc_coefs(), flac_encode_init(), and ra144_encode_init().
| void ff_lpc_init_x86 | ( | LPCContext * | s | ) |
1.5.8