From 3d5d46233cd81f78138a6d7418d480af04d3f6c8 Mon Sep 17 00:00:00 2001 From: Diego Biurrun Date: Sun, 1 Feb 2015 11:08:17 +0100 Subject: opus: Factor out imdct15 into a standalone component It will be reused by the AAC decoder. --- libavcodec/imdct15.h | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 libavcodec/imdct15.h (limited to 'libavcodec/imdct15.h') diff --git a/libavcodec/imdct15.h b/libavcodec/imdct15.h new file mode 100644 index 0000000000..ed3f0039e8 --- /dev/null +++ b/libavcodec/imdct15.h @@ -0,0 +1,57 @@ +/* + * This file is part of Libav. + * + * 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. + * + * 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 Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef AVCODEC_IMDCT15_H +#define AVCODEC_IMDCT15_H + +#include + +#include "avfft.h" + +typedef struct IMDCT15Context { + int fft_n; + int len2; + int len4; + + FFTComplex *tmp; + + FFTComplex *twiddle_exptab; + + FFTComplex *exptab[6]; + + /** + * Calculate the middle half of the iMDCT + */ + void (*imdct_half)(struct IMDCT15Context *s, float *dst, const float *src, + ptrdiff_t src_stride, float scale); +} IMDCT15Context; + +/** + * Init an iMDCT of the length 2 * 15 * (2^N) + */ +int ff_imdct15_init(IMDCT15Context **s, int N); + +/** + * Free an iMDCT. + */ +void ff_imdct15_uninit(IMDCT15Context **s); + + +void ff_imdct15_init_aarch64(IMDCT15Context *s); + +#endif /* AVCODEC_IMDCT15_H */ -- cgit v1.2.3