2 * Copyright (c) 2004 Gildas Bazin
3 * Copyright (c) 2010 Mans Rullgard <mans@mansr.com>
5 * This file is part of Libav.
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #include "libavutil/attributes.h"
24 #include "libavutil/intreadwrite.h"
27 static void int8x8_fmul_int32_c(float *dst, const int8_t *src, int scale)
29 float fscale = scale / 16.0;
31 for (i = 0; i < 8; i++)
32 dst[i] = src[i] * fscale;
36 dca_lfe_fir(float *out, const float *in, const float *coefs,
39 float *out2 = out + decifactor;
40 const float *cf0 = coefs;
41 const float *cf1 = coefs + 256;
44 /* One decimated sample generates 2*decifactor interpolated ones */
45 for (k = 0; k < decifactor; k++) {
48 for (j = 0; j < 256 / decifactor; j++) {
58 static void dca_qmf_32_subbands(float samples_in[32][8], int sb_act,
59 SynthFilterContext *synth, FFTContext *imdct,
60 float synth_buf_ptr[512],
61 int *synth_buf_offset, float synth_buf2[32],
62 const float window[512], float *samples_out,
63 float raXin[32], float scale)
68 for (i = sb_act; i < 32; i++)
71 /* Reconstructed channel sample index */
72 for (subindex = 0; subindex < 8; subindex++) {
73 /* Load in one sample from each subband and clear inactive subbands */
74 for (i = 0; i < sb_act; i++) {
75 unsigned sign = (i - 1) & 2;
76 uint32_t v = AV_RN32A(&samples_in[i][subindex]) ^ sign << 30;
77 AV_WN32A(&raXin[i], v);
80 synth->synth_filter_float(imdct, synth_buf_ptr, synth_buf_offset,
81 synth_buf2, window, samples_out, raXin, scale);
86 static void dca_lfe_fir0_c(float *out, const float *in, const float *coefs)
88 dca_lfe_fir(out, in, coefs, 32);
91 static void dca_lfe_fir1_c(float *out, const float *in, const float *coefs)
93 dca_lfe_fir(out, in, coefs, 64);
96 av_cold void ff_dcadsp_init(DCADSPContext *s)
98 s->lfe_fir[0] = dca_lfe_fir0_c;
99 s->lfe_fir[1] = dca_lfe_fir1_c;
100 s->qmf_32_subbands = dca_qmf_32_subbands;
101 s->int8x8_fmul_int32 = int8x8_fmul_int32_c;
102 if (ARCH_ARM) ff_dcadsp_init_arm(s);
103 if (ARCH_X86) ff_dcadsp_init_x86(s);