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The bulk of calls to quantize_band_cost are replaced by a call to a version that memoizes, greatly improving performance, since during coefficient search there is a great deal of repeat work. Memoization cannot always be applied, so do this in a different function, and leave the original as-is.
53 lines
1.9 KiB
C
53 lines
1.9 KiB
C
/*
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* AAC encoder quantization
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* Copyright (C) 2015 Claudio Freire
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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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/**
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* @file
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* AAC encoder quantization misc reusable function templates
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* @author Claudio Freire ( klaussfreire gmail com )
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*/
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#ifndef AVCODEC_AACENC_QUANTIZATION_MISC_H
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#define AVCODEC_AACENC_QUANTIZATION_MISC_H
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static inline float quantize_band_cost_cached(struct AACEncContext *s, int w, int g, const float *in,
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const float *scaled, int size, int scale_idx,
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int cb, const float lambda, const float uplim,
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int *bits, float *energy, int rtz)
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{
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AACQuantizeBandCostCacheEntry *entry;
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av_assert1(scale_idx >= 0 && scale_idx < 256);
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entry = &s->quantize_band_cost_cache[scale_idx][w*16+g];
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if (entry->bits < 0 || entry->cb != cb || entry->rtz != rtz) {
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entry->rd = quantize_band_cost(s, in, scaled, size, scale_idx,
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cb, lambda, uplim, &entry->bits, &entry->energy, rtz);
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entry->cb = cb;
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entry->rtz = rtz;
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}
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if (bits)
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*bits = entry->bits;
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if (energy)
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*energy = entry->energy;
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return entry->rd;
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}
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#endif /* AVCODEC_AACENC_QUANTIZATION_MISC_H */
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