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4cb6964244
The vector dequantization has a test in a loop preventing effective SIMD
implementation. By moving it out of the loop, this loop can be DSPized.
Therefore, modify the current DSP implementation. In particular, the
DSP implementation no longer has to handle null loop sizes.
The decode_hf implementations have following timings:
For x86 Arrandale:
C SSE SSE2 SSE4
win32: 260 162 119 104
win64: 242 N/A 89 72
The arm NEON optimizations follow in a later patch as external asm. The
now unused check for the y modifier in arm inline asm is removed from
configure.
47 lines
1.8 KiB
C
47 lines
1.8 KiB
C
/*
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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_DCADSP_H
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#define AVCODEC_DCADSP_H
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#include "avfft.h"
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#include "synth_filter.h"
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#define DCA_SUBBANDS 32
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typedef struct DCADSPContext {
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void (*lfe_fir[2])(float *out, const float *in, const float *coefs);
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void (*qmf_32_subbands)(float samples_in[32][8], int sb_act,
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SynthFilterContext *synth, FFTContext *imdct,
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float synth_buf_ptr[512],
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int *synth_buf_offset, float synth_buf2[32],
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const float window[512], float *samples_out,
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float raXin[32], float scale);
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void (*decode_hf)(float dst[DCA_SUBBANDS][8],
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const int32_t vq_num[DCA_SUBBANDS],
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const int8_t hf_vq[1024][32], intptr_t vq_offset,
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int32_t scale[DCA_SUBBANDS][2],
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intptr_t start, intptr_t end);
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} DCADSPContext;
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void ff_dcadsp_init(DCADSPContext *s);
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void ff_dcadsp_init_arm(DCADSPContext *s);
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void ff_dcadsp_init_x86(DCADSPContext *s);
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#endif /* AVCODEC_DCADSP_H */
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