3 * Copyright (c) 2011 Justin Ruggles
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #ifndef AVCODEC_AC3DSP_H
23 #define AVCODEC_AC3DSP_H
27 typedef struct AC3DSPContext {
29 * Set each encoded exponent in a block to the minimum of itself and the
30 * exponents in the same frequency bin of up to 5 following blocks.
31 * @param exp pointer to the start of the current block of exponents.
32 * constraints: align 16
33 * @param num_reuse_blocks number of blocks that will reuse exponents from the current block.
34 * constraints: range 0 to 5
35 * @param nb_coefs number of frequency coefficients.
37 void (*ac3_exponent_min)(uint8_t *exp, int num_reuse_blocks, int nb_coefs);
40 * Calculate the maximum MSB of the absolute value of each element in an
42 * @param src input array
43 * constraints: align 16. values must be in range [-32767,32767]
44 * @param len number of values in the array
45 * constraints: multiple of 16 greater than 0
46 * @return a value with the same MSB as max(abs(src[]))
48 int (*ac3_max_msb_abs_int16)(const int16_t *src, int len);
51 void ff_ac3dsp_init (AC3DSPContext *c);
52 void ff_ac3dsp_init_x86(AC3DSPContext *c);
54 #endif /* AVCODEC_AC3DSP_H */