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2ba45a60 DM |
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" | |
f6fa7814 | 23 | |
2ba45a60 DM |
24 | #include "libavutil/attributes.h" |
25 | #include "libavutil/intreadwrite.h" | |
f6fa7814 | 26 | |
2ba45a60 DM |
27 | #include "dcadsp.h" |
28 | ||
29 | static void decode_hf_c(float dst[DCA_SUBBANDS][8], | |
30 | const int32_t vq_num[DCA_SUBBANDS], | |
31 | const int8_t hf_vq[1024][32], intptr_t vq_offset, | |
32 | int32_t scale[DCA_SUBBANDS][2], | |
33 | intptr_t start, intptr_t end) | |
34 | { | |
35 | int i, l; | |
36 | ||
37 | for (l = start; l < end; l++) { | |
38 | /* 1 vector -> 32 samples but we only need the 8 samples | |
39 | * for this subsubframe. */ | |
40 | const int8_t *ptr = &hf_vq[vq_num[l]][vq_offset]; | |
41 | float fscale = scale[l][0] * (1 / 16.0); | |
42 | for (i = 0; i < 8; i++) | |
43 | dst[l][i] = ptr[i] * fscale; | |
44 | } | |
45 | } | |
46 | ||
f6fa7814 DM |
47 | static inline void dca_lfe_fir(float *out, const float *in, const float *coefs, |
48 | int decifactor) | |
2ba45a60 DM |
49 | { |
50 | float *out2 = out + 2 * decifactor - 1; | |
51 | int num_coeffs = 256 / decifactor; | |
52 | int j, k; | |
53 | ||
54 | /* One decimated sample generates 2*decifactor interpolated ones */ | |
55 | for (k = 0; k < decifactor; k++) { | |
56 | float v0 = 0.0; | |
57 | float v1 = 0.0; | |
58 | for (j = 0; j < num_coeffs; j++, coefs++) { | |
f6fa7814 | 59 | v0 += in[-j] * *coefs; |
2ba45a60 DM |
60 | v1 += in[j + 1 - num_coeffs] * *coefs; |
61 | } | |
62 | *out++ = v0; | |
63 | *out2-- = v1; | |
64 | } | |
65 | } | |
66 | ||
67 | static void dca_qmf_32_subbands(float samples_in[32][8], int sb_act, | |
68 | SynthFilterContext *synth, FFTContext *imdct, | |
69 | float synth_buf_ptr[512], | |
70 | int *synth_buf_offset, float synth_buf2[32], | |
71 | const float window[512], float *samples_out, | |
72 | float raXin[32], float scale) | |
73 | { | |
74 | int i; | |
75 | int subindex; | |
76 | ||
77 | for (i = sb_act; i < 32; i++) | |
78 | raXin[i] = 0.0; | |
79 | ||
80 | /* Reconstructed channel sample index */ | |
81 | for (subindex = 0; subindex < 8; subindex++) { | |
82 | /* Load in one sample from each subband and clear inactive subbands */ | |
83 | for (i = 0; i < sb_act; i++) { | |
84 | unsigned sign = (i - 1) & 2; | |
85 | uint32_t v = AV_RN32A(&samples_in[i][subindex]) ^ sign << 30; | |
86 | AV_WN32A(&raXin[i], v); | |
87 | } | |
88 | ||
89 | synth->synth_filter_float(imdct, synth_buf_ptr, synth_buf_offset, | |
f6fa7814 DM |
90 | synth_buf2, window, samples_out, raXin, |
91 | scale); | |
2ba45a60 DM |
92 | samples_out += 32; |
93 | } | |
94 | } | |
95 | ||
96 | static void dca_lfe_fir0_c(float *out, const float *in, const float *coefs) | |
97 | { | |
98 | dca_lfe_fir(out, in, coefs, 32); | |
99 | } | |
100 | ||
101 | static void dca_lfe_fir1_c(float *out, const float *in, const float *coefs) | |
102 | { | |
103 | dca_lfe_fir(out, in, coefs, 64); | |
104 | } | |
105 | ||
106 | av_cold void ff_dcadsp_init(DCADSPContext *s) | |
107 | { | |
f6fa7814 DM |
108 | s->lfe_fir[0] = dca_lfe_fir0_c; |
109 | s->lfe_fir[1] = dca_lfe_fir1_c; | |
2ba45a60 | 110 | s->qmf_32_subbands = dca_qmf_32_subbands; |
f6fa7814 DM |
111 | s->decode_hf = decode_hf_c; |
112 | ||
113 | if (ARCH_ARM) | |
114 | ff_dcadsp_init_arm(s); | |
115 | if (ARCH_X86) | |
116 | ff_dcadsp_init_x86(s); | |
2ba45a60 | 117 | } |