mirror of
https://git.videolan.org/git/ffmpeg.git
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416d2f7a12
* qatar/master:
vc1: export some functions
configure: use HOSTCC_C/O in check_host_cc
configure: use AS_O setting in check_as
configure: use LD_O setting in check_ld()
Revert "dsputil: make {add/put/put_signed}_pixels_clamped() non-static."
build: Restore dependency of acelp_filters.o on celp_math.o
celp_math: Replace duplicate ff_dot_productf() by ff_scalarproduct_c()
celp_math: Move ff_cos() to the only place it is used
build: Use portable abstraction for linker/hostcc output file syntax
configure: Fix shared library creation for OpenBSD
vp56: Don't use DECLARE_ALIGN on a typedef name
mss1: move code that will be reused by MSS2 decoder into separate file
mss1: merge decode_intra() and decode_inter()
avprobe: Get rid of ugly casts in the options table
vf_hqdn3d: Remove a duplicate inline declaration
Conflicts:
Makefile
configure
ffprobe.c
libavcodec/Makefile
libavcodec/amrnbdec.c
libavcodec/amrwbdec.c
libavcodec/celp_math.c
libavcodec/celp_math.h
libavcodec/dsputil.c
libavcodec/lsp.c
libavcodec/mss1.c
libavcodec/ra288.c
libavcodec/vc1dec.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>
98 lines
2.7 KiB
C
98 lines
2.7 KiB
C
/*
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* Various fixed-point math operations
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*
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* Copyright (c) 2008 Vladimir Voroshilov
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_CELP_MATH_H
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#define AVCODEC_CELP_MATH_H
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#include <stdint.h>
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typedef struct CELPMContext {
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/**
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* Return the dot product.
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* @param a input data array
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* @param b input data array
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* @param length number of elements
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*
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* @return dot product = sum of elementwise products
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*/
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float (*dot_productf)(const float* a, const float* b, int length);
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}CELPMContext;
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/**
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* Initialize CELPMContext.
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*/
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void ff_celp_math_init(CELPMContext *c);
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void ff_celp_math_init_mips(CELPMContext *c);
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/**
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* fixed-point implementation of exp2(x) in [0; 1] domain.
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* @param power argument to exp2, 0 <= power <= 0x7fff
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*
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* @return value of (1<<20) * exp2(power / (1<<15))
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* 0x8000c <= result <= 0xfffea
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*/
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int ff_exp2(uint16_t power);
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/**
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* Calculate log2(x).
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* @param value function argument, 0 < value <= 7fff ffff
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*
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* @return value of (1<<15) * log2(value)
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*/
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int ff_log2(uint32_t value);
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/**
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* Shift value left or right depending on sign of offset parameter.
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* @param value value to shift
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* @param offset shift offset
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*
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* @return value << offset, if offset>=0; value >> -offset - otherwise
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*/
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static inline int bidir_sal(int value, int offset)
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{
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if(offset < 0) return value >> -offset;
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else return value << offset;
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}
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/**
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* returns the dot product of 2 int16_t vectors.
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* @param a input data array
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* @param b input data array
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* @param length number of elements
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*
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* @return dot product = sum of elementwise products
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*/
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int64_t ff_dot_product(const int16_t *a, const int16_t *b, int length);
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/**
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* Return the dot product.
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* @param a input data array
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* @param b input data array
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* @param length number of elements
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*
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* @return dot product = sum of elementwise products
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*/
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float ff_dot_productf(const float* a, const float* b, int length);
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#endif /* AVCODEC_CELP_MATH_H */
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