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31c6f6f65c
This is similar to int32_to_float_fmul_scalar, but loads a new scalar multiplier every 8 input samples. This enables the use of much larger input arrays, which is important for pipelining on some CPUs (such as ARMv6). Signed-off-by: Martin Storsjö <martin@martin.st>
114 lines
4.4 KiB
C
114 lines
4.4 KiB
C
/*
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* Format Conversion Utils
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* Copyright (c) 2000, 2001 Fabrice Bellard
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* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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_FMTCONVERT_H
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#define AVCODEC_FMTCONVERT_H
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#include "avcodec.h"
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typedef struct FmtConvertContext {
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/**
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* Convert an array of int32_t to float and multiply by a float value.
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* @param dst destination array of float.
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* constraints: 16-byte aligned
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* @param src source array of int32_t.
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* constraints: 16-byte aligned
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* @param len number of elements to convert.
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* constraints: multiple of 8
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*/
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void (*int32_to_float_fmul_scalar)(float *dst, const int32_t *src,
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float mul, int len);
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/**
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* Convert an array of int32_t to float and multiply by a float value from another array,
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* stepping along the float array once for each 8 integers.
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* @param c pointer to FmtConvertContext.
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* @param dst destination array of float.
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* constraints: 16-byte aligned
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* @param src source array of int32_t.
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* constraints: 16-byte aligned
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* @param mul source array of float multipliers.
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* @param len number of elements to convert.
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* constraints: multiple of 8
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*/
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void (*int32_to_float_fmul_array8)(struct FmtConvertContext *c,
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float *dst, const int32_t *src,
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const float *mul, int len);
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/**
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* Convert an array of float to an array of int16_t.
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*
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* Convert floats from in the range [-32768.0,32767.0] to ints
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* without rescaling
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*
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* @param dst destination array of int16_t.
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* constraints: 16-byte aligned
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* @param src source array of float.
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* constraints: 16-byte aligned
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* @param len number of elements to convert.
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* constraints: multiple of 8
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*/
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void (*float_to_int16)(int16_t *dst, const float *src, long len);
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/**
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* Convert multiple arrays of float to an interleaved array of int16_t.
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*
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* Convert floats from in the range [-32768.0,32767.0] to ints
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* without rescaling
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*
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* @param dst destination array of interleaved int16_t.
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* constraints: 16-byte aligned
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* @param src source array of float arrays, one for each channel.
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* constraints: 16-byte aligned
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* @param len number of elements to convert.
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* constraints: multiple of 8
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* @param channels number of channels
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*/
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void (*float_to_int16_interleave)(int16_t *dst, const float **src,
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long len, int channels);
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/**
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* Convert multiple arrays of float to an array of interleaved float.
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*
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* @param dst destination array of interleaved float.
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* constraints: 16-byte aligned
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* @param src source array of float arrays, one for each channel.
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* constraints: 16-byte aligned
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* @param len number of elements to convert.
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* constraints: multiple of 8
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* @param channels number of channels
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*/
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void (*float_interleave)(float *dst, const float **src, unsigned int len,
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int channels);
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} FmtConvertContext;
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void ff_float_interleave_c(float *dst, const float **src, unsigned int len,
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int channels);
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void ff_fmt_convert_init(FmtConvertContext *c, AVCodecContext *avctx);
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void ff_fmt_convert_init_arm(FmtConvertContext *c, AVCodecContext *avctx);
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void ff_fmt_convert_init_ppc(FmtConvertContext *c, AVCodecContext *avctx);
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void ff_fmt_convert_init_x86(FmtConvertContext *c, AVCodecContext *avctx);
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#endif /* AVCODEC_FMTCONVERT_H */
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