| 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 | } |