On 2/10/2017 9:25 PM, Rostislav Pehlivanov wrote:
> Handles strides (needed for Opus transients), does pre-reindexing and folding
> without needing a copy.
>
> Signed-off-by: Rostislav Pehlivanov <atomnu...@gmail.com>
> ---
> configure | 6 +-
> libavcodec/Makefile | 2 +-
> libavcodec/aac.h | 4 +-
> libavcodec/aacdec.c | 2 +-
> libavcodec/aacdec_template.c | 4 +-
> libavcodec/mdct15.c | 335
> +++++++++++++++++++++++++++++++++++++++++++
> libavcodec/mdct15.h | 70 +++++++++
> libavcodec/opus_celt.c | 10 +-
> 8 files changed, 419 insertions(+), 14 deletions(-)
> create mode 100644 libavcodec/mdct15.c
> create mode 100644 libavcodec/mdct15.h
Forgot to do "git rm libavcodec/imdct15.*"?
> diff --git a/libavcodec/mdct15.h b/libavcodec/mdct15.h
> new file mode 100644
> index 0000000000..2a503e5996
> --- /dev/null
> +++ b/libavcodec/mdct15.h
> @@ -0,0 +1,70 @@
> +/*
> + * Copyright (c) 2017 Rostislav Pehlivanov <atomnu...@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
> + */
> +
> +#ifndef AVCODEC_MDCT15_H
> +#define AVCODEC_MDCT15_H
> +
> +#include <stddef.h>
> +
> +#include "fft.h"
> +
> +typedef struct MDCT15Context {
> + int fft_n;
> + int len2;
> + int len4;
> + int inverse;
> + int *pfa_prereindex;
> + int *pfa_postreindex;
> +
> + FFTContext ptwo_fft;
> +
> + FFTComplex *tmp;
> +
> + FFTComplex *twiddle_exptab;
> +
> + /* 0 - 18: fft15 twiddles, 19 - 20: fft5 twiddles */
> + FFTComplex exptab[21];
> +
> + /**
> + * Calculate a full 2N -> N MDCT
> + */
> + void (*mdct)(struct MDCT15Context *s, float *dst, const float *src,
> ptrdiff_t stride);
> +
> + /**
> + * Calculate the middle half of the iMDCT
> + */
> + void (*imdct_half)(struct MDCT15Context *s, float *dst, const float *src,
> + ptrdiff_t src_stride, float scale);
> +} MDCT15Context;
> +
> +/**
> + * Init an (i)MDCT of the length 2 * 15 * (2^N)
> + */
> +int ff_mdct15_init(MDCT15Context **ps, int inverse, int N, double scale);
> +
> +/**
> + * Frees a context
> + */
> +void ff_mdct15_uninit(MDCT15Context **ps);
> +
> +
> +void ff_mdct15_init_aarch64(MDCT15Context *s);
This seems like a remnant of old code.
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