mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2026-10-28 10:04:37 +08:00
Shreesh Adiga
58a2dc3c2e
Add NEON implementation using LD3 to load 48 bytes with de-interleaving using which 6 bits are extracted using USHR and SLI to get 4 registers, which is used as a index into lookup table using TBL with 4 registers to translate into the 64-byte output, which is written using ST4 to interleave. Add a checkasm test to validate the input lengths from 0 to 239 bytes to cover all the code paths introduced in the NEON implementation. Refactored the C implementation into a header file so that it can be used from checkasm test without having to duplicate the code there. Observed about 4x speedup by checkasm on A720 core on 1kB input: C: - base64.base64 [OK] NEON: - base64.base64 [OK] checkasm: all 1 tests passed Benchmark results: name nsecs (vs ref) av_base64_encode_c: 1286.9 av_base64_encode_neon: 315.5 ( 4.08x)
67 lines
2.1 KiB
C
67 lines
2.1 KiB
C
/*
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* Copyright (c) 2006 Ryan Martell. (rdm4@martellventures.com)
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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 AVUTIL_BASE64_INTERNAL_H
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#define AVUTIL_BASE64_INTERNAL_H
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#include <stdint.h>
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#include "intreadwrite.h"
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/*****************************************************************************
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* b64_encode: Stolen from VLC's http.c.
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* Simplified by Michael.
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* Fixed edge cases and made it work from data (vs. strings) by Ryan.
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*****************************************************************************/
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static inline char *ff_base64_encode_c(char *out, const uint8_t *in, int in_size, const char *b64)
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{
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char *ret, *dst;
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unsigned i_bits = 0;
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int i_shift = 0;
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int bytes_remaining = in_size;
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ret = dst = out;
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while (bytes_remaining > 3) {
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i_bits = AV_RB32(in);
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in += 3; bytes_remaining -= 3;
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*dst++ = b64[ i_bits>>26 ];
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*dst++ = b64[(i_bits>>20) & 0x3F];
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*dst++ = b64[(i_bits>>14) & 0x3F];
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*dst++ = b64[(i_bits>>8 ) & 0x3F];
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}
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i_bits = 0;
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while (bytes_remaining) {
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i_bits = (i_bits << 8) + *in++;
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bytes_remaining--;
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i_shift += 8;
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}
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while (i_shift > 0) {
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*dst++ = b64[(i_bits << 6 >> i_shift) & 0x3f];
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i_shift -= 6;
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}
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while ((dst - ret) & 3)
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*dst++ = '=';
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*dst = '\0';
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return ret;
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}
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#endif /* AVUTIL_BASE64_INTERNAL_H */
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