* LPC utility code
* Copyright (c) 2006 Justin Ruggles <justin.ruggles@gmail.com>
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#define MIN_LPC_ORDER 1
#define MAX_LPC_ORDER 32
+/**
+ * LPC analysis type
+ */
+enum FFLPCType {
+ FF_LPC_TYPE_DEFAULT = -1, ///< use the codec default LPC type
+ FF_LPC_TYPE_NONE = 0, ///< do not use LPC prediction or use all zero coefficients
+ FF_LPC_TYPE_FIXED = 1, ///< fixed LPC coefficients
+ FF_LPC_TYPE_LEVINSON = 2, ///< Levinson-Durbin recursion
+ FF_LPC_TYPE_CHOLESKY = 3, ///< Cholesky factorization
+ FF_LPC_TYPE_NB , ///< Not part of ABI
+};
typedef struct LPCContext {
int blocksize;
int max_order;
- enum AVLPCType lpc_type;
+ enum FFLPCType lpc_type;
double *windowed_samples;
/**
const int32_t *samples, int blocksize, int min_order,
int max_order, int precision,
int32_t coefs[][MAX_LPC_ORDER], int *shift,
- enum AVLPCType lpc_type, int lpc_passes,
+ enum FFLPCType lpc_type, int lpc_passes,
int omethod, int max_shift, int zero_shift);
/**
* Initialize LPCContext.
*/
int ff_lpc_init(LPCContext *s, int blocksize, int max_order,
- enum AVLPCType lpc_type);
+ enum FFLPCType lpc_type);
void ff_lpc_init_x86(LPCContext *s);
/**