2 * Copyright (c) 2004 Gildas Bazin
3 * Copyright (c) 2010 Mans Rullgard <mans@mansr.com>
5 * This file is part of FFmpeg.
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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 dca_lfe_fir_c(float *out, const float *in, const float *coefs,
28 int decifactor, float scale)
30 float *out2 = out + decifactor;
31 const float *cf0 = coefs;
32 const float *cf1 = coefs + 256;
35 /* One decimated sample generates 2*decifactor interpolated ones */
36 for (k = 0; k < decifactor; k++) {
39 for (j = 0; j < 256 / decifactor; j++) {
49 static void dca_qmf_32_subbands(float samples_in[32][8], int sb_act,
50 SynthFilterContext *synth, FFTContext *imdct,
51 float synth_buf_ptr[512],
52 int *synth_buf_offset, float synth_buf2[32],
53 const float window[512], float *samples_out,
54 float raXin[32], float scale)
59 for (i = sb_act; i < 32; i++)
62 /* Reconstructed channel sample index */
63 for (subindex = 0; subindex < 8; subindex++) {
64 /* Load in one sample from each subband and clear inactive subbands */
65 for (i = 0; i < sb_act; i++) {
66 unsigned sign = (i - 1) & 2;
67 uint32_t v = AV_RN32A(&samples_in[i][subindex]) ^ sign << 30;
68 AV_WN32A(&raXin[i], v);
71 synth->synth_filter_float(imdct, synth_buf_ptr, synth_buf_offset,
72 synth_buf2, window, samples_out, raXin, scale);
77 av_cold void ff_dcadsp_init(DCADSPContext *s)
79 s->lfe_fir = dca_lfe_fir_c;
80 s->qmf_32_subbands = dca_qmf_32_subbands;
81 if (ARCH_ARM) ff_dcadsp_init_arm(s);