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1 | /* |
2 | * Copyright (c) 2004 Gildas Bazin | |
3 | * Copyright (c) 2010 Mans Rullgard <mans@mansr.com> | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
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. | |
11 | * | |
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. | |
16 | * | |
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 | |
20 | */ | |
21 | ||
22 | #include "config.h" | |
23 | #include "libavutil/attributes.h" | |
24 | #include "libavutil/intreadwrite.h" | |
25 | #include "dcadsp.h" | |
26 | ||
27 | static void decode_hf_c(float dst[DCA_SUBBANDS][8], | |
28 | const int32_t vq_num[DCA_SUBBANDS], | |
29 | const int8_t hf_vq[1024][32], intptr_t vq_offset, | |
30 | int32_t scale[DCA_SUBBANDS][2], | |
31 | intptr_t start, intptr_t end) | |
32 | { | |
33 | int i, l; | |
34 | ||
35 | for (l = start; l < end; l++) { | |
36 | /* 1 vector -> 32 samples but we only need the 8 samples | |
37 | * for this subsubframe. */ | |
38 | const int8_t *ptr = &hf_vq[vq_num[l]][vq_offset]; | |
39 | float fscale = scale[l][0] * (1 / 16.0); | |
40 | for (i = 0; i < 8; i++) | |
41 | dst[l][i] = ptr[i] * fscale; | |
42 | } | |
43 | } | |
44 | ||
45 | static inline void | |
46 | dca_lfe_fir(float *out, const float *in, const float *coefs, | |
47 | int decifactor) | |
48 | { | |
49 | float *out2 = out + 2 * decifactor - 1; | |
50 | int num_coeffs = 256 / decifactor; | |
51 | int j, k; | |
52 | ||
53 | /* One decimated sample generates 2*decifactor interpolated ones */ | |
54 | for (k = 0; k < decifactor; k++) { | |
55 | float v0 = 0.0; | |
56 | float v1 = 0.0; | |
57 | for (j = 0; j < num_coeffs; j++, coefs++) { | |
58 | v0 += in[-j] * *coefs; | |
59 | v1 += in[j + 1 - num_coeffs] * *coefs; | |
60 | } | |
61 | *out++ = v0; | |
62 | *out2-- = v1; | |
63 | } | |
64 | } | |
65 | ||
66 | static void dca_qmf_32_subbands(float samples_in[32][8], int sb_act, | |
67 | SynthFilterContext *synth, FFTContext *imdct, | |
68 | float synth_buf_ptr[512], | |
69 | int *synth_buf_offset, float synth_buf2[32], | |
70 | const float window[512], float *samples_out, | |
71 | float raXin[32], float scale) | |
72 | { | |
73 | int i; | |
74 | int subindex; | |
75 | ||
76 | for (i = sb_act; i < 32; i++) | |
77 | raXin[i] = 0.0; | |
78 | ||
79 | /* Reconstructed channel sample index */ | |
80 | for (subindex = 0; subindex < 8; subindex++) { | |
81 | /* Load in one sample from each subband and clear inactive subbands */ | |
82 | for (i = 0; i < sb_act; i++) { | |
83 | unsigned sign = (i - 1) & 2; | |
84 | uint32_t v = AV_RN32A(&samples_in[i][subindex]) ^ sign << 30; | |
85 | AV_WN32A(&raXin[i], v); | |
86 | } | |
87 | ||
88 | synth->synth_filter_float(imdct, synth_buf_ptr, synth_buf_offset, | |
89 | synth_buf2, window, samples_out, raXin, scale); | |
90 | samples_out += 32; | |
91 | } | |
92 | } | |
93 | ||
94 | static void dca_lfe_fir0_c(float *out, const float *in, const float *coefs) | |
95 | { | |
96 | dca_lfe_fir(out, in, coefs, 32); | |
97 | } | |
98 | ||
99 | static void dca_lfe_fir1_c(float *out, const float *in, const float *coefs) | |
100 | { | |
101 | dca_lfe_fir(out, in, coefs, 64); | |
102 | } | |
103 | ||
104 | av_cold void ff_dcadsp_init(DCADSPContext *s) | |
105 | { | |
106 | s->lfe_fir[0] = dca_lfe_fir0_c; | |
107 | s->lfe_fir[1] = dca_lfe_fir1_c; | |
108 | s->qmf_32_subbands = dca_qmf_32_subbands; | |
109 | s->decode_hf = decode_hf_c; | |
110 | if (ARCH_ARM) ff_dcadsp_init_arm(s); | |
111 | if (ARCH_X86) ff_dcadsp_init_x86(s); | |
112 | } |