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1 | /* |
2 | * Copyright (c) 2012 | |
3 | * MIPS Technologies, Inc., California. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. Neither the name of the MIPS Technologies, Inc., nor the names of its | |
14 | * contributors may be used to endorse or promote products derived from | |
15 | * this software without specific prior written permission. | |
16 | * | |
17 | * THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND | |
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE | |
21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
27 | * SUCH DAMAGE. | |
28 | * | |
29 | * Author: Stanislav Ocovaj (socovaj@mips.com) | |
30 | * | |
31 | * AC3 fixed-point decoder for MIPS platforms | |
32 | * | |
33 | * This file is part of FFmpeg. | |
34 | * | |
35 | * FFmpeg is free software; you can redistribute it and/or | |
36 | * modify it under the terms of the GNU Lesser General Public | |
37 | * License as published by the Free Software Foundation; either | |
38 | * version 2.1 of the License, or (at your option) any later version. | |
39 | * | |
40 | * FFmpeg is distributed in the hope that it will be useful, | |
41 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
42 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
43 | * Lesser General Public License for more details. | |
44 | * | |
45 | * You should have received a copy of the GNU Lesser General Public | |
46 | * License along with FFmpeg; if not, write to the Free Software | |
47 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
48 | */ | |
49 | ||
50 | #define FFT_FLOAT 0 | |
51 | #define USE_FIXED 1 | |
52 | #define FFT_FIXED_32 1 | |
53 | #include "ac3dec.h" | |
54 | ||
55 | ||
56 | static const int end_freq_inv_tab[8] = | |
57 | { | |
58 | 50529027, 44278013, 39403370, 32292987, 27356480, 23729101, 20951060, 18755316 | |
59 | }; | |
60 | ||
61 | static void scale_coefs ( | |
62 | int32_t *dst, | |
63 | const int32_t *src, | |
64 | int dynrng, | |
65 | int len) | |
66 | { | |
67 | int i, shift, round; | |
68 | int16_t mul; | |
69 | int temp, temp1, temp2, temp3, temp4, temp5, temp6, temp7; | |
70 | ||
71 | mul = (dynrng & 0x1f) + 0x20; | |
72 | shift = 4 - ((dynrng << 23) >> 28); | |
73 | if (shift > 0 ) { | |
74 | round = 1 << (shift-1); | |
75 | for (i=0; i<len; i+=8) { | |
76 | ||
77 | temp = src[i] * mul; | |
78 | temp1 = src[i+1] * mul; | |
79 | temp = temp + round; | |
80 | temp2 = src[i+2] * mul; | |
81 | ||
82 | temp1 = temp1 + round; | |
83 | dst[i] = temp >> shift; | |
84 | temp3 = src[i+3] * mul; | |
85 | temp2 = temp2 + round; | |
86 | ||
87 | dst[i+1] = temp1 >> shift; | |
88 | temp4 = src[i + 4] * mul; | |
89 | temp3 = temp3 + round; | |
90 | dst[i+2] = temp2 >> shift; | |
91 | ||
92 | temp5 = src[i+5] * mul; | |
93 | temp4 = temp4 + round; | |
94 | dst[i+3] = temp3 >> shift; | |
95 | temp6 = src[i+6] * mul; | |
96 | ||
97 | dst[i+4] = temp4 >> shift; | |
98 | temp5 = temp5 + round; | |
99 | temp7 = src[i+7] * mul; | |
100 | temp6 = temp6 + round; | |
101 | ||
102 | dst[i+5] = temp5 >> shift; | |
103 | temp7 = temp7 + round; | |
104 | dst[i+6] = temp6 >> shift; | |
105 | dst[i+7] = temp7 >> shift; | |
106 | ||
107 | } | |
108 | } else { | |
109 | shift = -shift; | |
110 | for (i=0; i<len; i+=8) { | |
111 | ||
112 | temp = src[i] * mul; | |
113 | temp1 = src[i+1] * mul; | |
114 | temp2 = src[i+2] * mul; | |
115 | ||
116 | dst[i] = temp << shift; | |
117 | temp3 = src[i+3] * mul; | |
118 | ||
119 | dst[i+1] = temp1 << shift; | |
120 | temp4 = src[i + 4] * mul; | |
121 | dst[i+2] = temp2 << shift; | |
122 | ||
123 | temp5 = src[i+5] * mul; | |
124 | dst[i+3] = temp3 << shift; | |
125 | temp6 = src[i+6] * mul; | |
126 | ||
127 | dst[i+4] = temp4 << shift; | |
128 | temp7 = src[i+7] * mul; | |
129 | ||
130 | dst[i+5] = temp5 << shift; | |
131 | dst[i+6] = temp6 << shift; | |
132 | dst[i+7] = temp7 << shift; | |
133 | ||
134 | } | |
135 | } | |
136 | } | |
137 | ||
138 | /** | |
139 | * Downmix samples from original signal to stereo or mono (this is for 16-bit samples | |
140 | * and fixed point decoder - original (for 32-bit samples) is in ac3dsp.c). | |
141 | */ | |
142 | static void ac3_downmix_c_fixed16(int16_t **samples, int16_t (*matrix)[2], | |
143 | int out_ch, int in_ch, int len) | |
144 | { | |
145 | int i, j; | |
146 | int v0, v1; | |
147 | if (out_ch == 2) { | |
148 | for (i = 0; i < len; i++) { | |
149 | v0 = v1 = 0; | |
150 | for (j = 0; j < in_ch; j++) { | |
151 | v0 += samples[j][i] * matrix[j][0]; | |
152 | v1 += samples[j][i] * matrix[j][1]; | |
153 | } | |
154 | samples[0][i] = (v0+2048)>>12; | |
155 | samples[1][i] = (v1+2048)>>12; | |
156 | } | |
157 | } else if (out_ch == 1) { | |
158 | for (i = 0; i < len; i++) { | |
159 | v0 = 0; | |
160 | for (j = 0; j < in_ch; j++) | |
161 | v0 += samples[j][i] * matrix[j][0]; | |
162 | samples[0][i] = (v0+2048)>>12; | |
163 | } | |
164 | } | |
165 | } | |
166 | ||
167 | #include "ac3dec.c" | |
168 | ||
169 | static const AVOption options[] = { | |
170 | { "drc_scale", "percentage of dynamic range compression to apply", OFFSET(drc_scale), AV_OPT_TYPE_FLOAT, {.dbl = 1.0}, 0.0, 6.0, PAR }, | |
171 | { "heavy_compr", "heavy dynamic range compression enabled", OFFSET(heavy_compression), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, PAR }, | |
172 | { NULL}, | |
173 | }; | |
174 | ||
175 | static const AVClass ac3_decoder_class = { | |
176 | .class_name = "Fixed-Point AC-3 Decoder", | |
177 | .item_name = av_default_item_name, | |
178 | .option = options, | |
179 | .version = LIBAVUTIL_VERSION_INT, | |
180 | }; | |
181 | ||
182 | AVCodec ff_ac3_fixed_decoder = { | |
183 | .name = "ac3_fixed", | |
184 | .type = AVMEDIA_TYPE_AUDIO, | |
185 | .id = AV_CODEC_ID_AC3, | |
186 | .priv_data_size = sizeof (AC3DecodeContext), | |
187 | .init = ac3_decode_init, | |
188 | .close = ac3_decode_end, | |
189 | .decode = ac3_decode_frame, | |
190 | .capabilities = CODEC_CAP_DR1, | |
191 | .long_name = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"), | |
192 | .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, | |
193 | AV_SAMPLE_FMT_NONE }, | |
194 | .priv_class = &ac3_decoder_class, | |
195 | }; |