1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
|
/*
* MACE decoder
* Copyright (c) 2002 Laszlo Torok <torokl@alpha.dfmk.hu>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* MACE decoder.
*/
#include "avcodec.h"
/*
* Adapted to libavcodec by Francois Revol <revol@free.fr>
* (removed 68k REG stuff, changed types, added some statics and consts,
* libavcodec api, context stuff, interlaced stereo out).
*/
static const int16_t MACEtab1[] = {-13, 8, 76, 222, 222, 76, 8, -13};
static const int16_t MACEtab3[] = {-18, 140, 140, -18};
static const int16_t MACEtab2[][4] = {
{ 37, 116, 206, 330}, { 39, 121, 216, 346},
{ 41, 127, 225, 361}, { 42, 132, 235, 377},
{ 44, 137, 245, 392}, { 46, 144, 256, 410},
{ 48, 150, 267, 428}, { 51, 157, 280, 449},
{ 53, 165, 293, 470}, { 55, 172, 306, 490},
{ 58, 179, 319, 511}, { 60, 187, 333, 534},
{ 63, 195, 348, 557}, { 66, 205, 364, 583},
{ 69, 214, 380, 609}, { 72, 223, 396, 635},
{ 75, 233, 414, 663}, { 79, 244, 433, 694},
{ 82, 254, 453, 725}, { 86, 265, 472, 756},
{ 90, 278, 495, 792}, { 94, 290, 516, 826},
{ 98, 303, 538, 862}, { 102, 316, 562, 901},
{ 107, 331, 588, 942}, { 112, 345, 614, 983},
{ 117, 361, 641, 1027}, { 122, 377, 670, 1074},
{ 127, 394, 701, 1123}, { 133, 411, 732, 1172},
{ 139, 430, 764, 1224}, { 145, 449, 799, 1280},
{ 152, 469, 835, 1337}, { 159, 490, 872, 1397},
{ 166, 512, 911, 1459}, { 173, 535, 951, 1523},
{ 181, 558, 993, 1590}, { 189, 584, 1038, 1663},
{ 197, 610, 1085, 1738}, { 206, 637, 1133, 1815},
{ 215, 665, 1183, 1895}, { 225, 695, 1237, 1980},
{ 235, 726, 1291, 2068}, { 246, 759, 1349, 2161},
{ 257, 792, 1409, 2257}, { 268, 828, 1472, 2357},
{ 280, 865, 1538, 2463}, { 293, 903, 1606, 2572},
{ 306, 944, 1678, 2688}, { 319, 986, 1753, 2807},
{ 334, 1030, 1832, 2933}, { 349, 1076, 1914, 3065},
{ 364, 1124, 1999, 3202}, { 380, 1174, 2088, 3344},
{ 398, 1227, 2182, 3494}, { 415, 1281, 2278, 3649},
{ 434, 1339, 2380, 3811}, { 453, 1398, 2486, 3982},
{ 473, 1461, 2598, 4160}, { 495, 1526, 2714, 4346},
{ 517, 1594, 2835, 4540}, { 540, 1665, 2961, 4741},
{ 564, 1740, 3093, 4953}, { 589, 1818, 3232, 5175},
{ 615, 1898, 3375, 5405}, { 643, 1984, 3527, 5647},
{ 671, 2072, 3683, 5898}, { 701, 2164, 3848, 6161},
{ 733, 2261, 4020, 6438}, { 766, 2362, 4199, 6724},
{ 800, 2467, 4386, 7024}, { 836, 2578, 4583, 7339},
{ 873, 2692, 4786, 7664}, { 912, 2813, 5001, 8008},
{ 952, 2938, 5223, 8364}, { 995, 3070, 5457, 8739},
{ 1039, 3207, 5701, 9129}, { 1086, 3350, 5956, 9537},
{ 1134, 3499, 6220, 9960}, { 1185, 3655, 6497, 10404},
{ 1238, 3818, 6788, 10869}, { 1293, 3989, 7091, 11355},
{ 1351, 4166, 7407, 11861}, { 1411, 4352, 7738, 12390},
{ 1474, 4547, 8084, 12946}, { 1540, 4750, 8444, 13522},
{ 1609, 4962, 8821, 14126}, { 1680, 5183, 9215, 14756},
{ 1756, 5415, 9626, 15415}, { 1834, 5657, 10057, 16104},
{ 1916, 5909, 10505, 16822}, { 2001, 6173, 10975, 17574},
{ 2091, 6448, 11463, 18356}, { 2184, 6736, 11974, 19175},
{ 2282, 7037, 12510, 20032}, { 2383, 7351, 13068, 20926},
{ 2490, 7679, 13652, 21861}, { 2601, 8021, 14260, 22834},
{ 2717, 8380, 14897, 23854}, { 2838, 8753, 15561, 24918},
{ 2965, 9144, 16256, 26031}, { 3097, 9553, 16982, 27193},
{ 3236, 9979, 17740, 28407}, { 3380, 10424, 18532, 29675},
{ 3531, 10890, 19359, 31000}, { 3688, 11375, 20222, 32382},
{ 3853, 11883, 21125, 32767}, { 4025, 12414, 22069, 32767},
{ 4205, 12967, 23053, 32767}, { 4392, 13546, 24082, 32767},
{ 4589, 14151, 25157, 32767}, { 4793, 14783, 26280, 32767},
{ 5007, 15442, 27452, 32767}, { 5231, 16132, 28678, 32767},
{ 5464, 16851, 29957, 32767}, { 5708, 17603, 31294, 32767},
{ 5963, 18389, 32691, 32767}, { 6229, 19210, 32767, 32767},
{ 6507, 20067, 32767, 32767}, { 6797, 20963, 32767, 32767},
{ 7101, 21899, 32767, 32767}, { 7418, 22876, 32767, 32767},
{ 7749, 23897, 32767, 32767}, { 8095, 24964, 32767, 32767},
{ 8456, 26078, 32767, 32767}, { 8833, 27242, 32767, 32767},
{ 9228, 28457, 32767, 32767}, { 9639, 29727, 32767, 32767}
};
static const int16_t MACEtab4[][2] = {
{ 64, 216}, { 67, 226}, { 70, 236}, { 74, 246},
{ 77, 257}, { 80, 268}, { 84, 280}, { 88, 294},
{ 92, 307}, { 96, 321}, { 100, 334}, { 104, 350},
{ 109, 365}, { 114, 382}, { 119, 399}, { 124, 416},
{ 130, 434}, { 136, 454}, { 142, 475}, { 148, 495},
{ 155, 519}, { 162, 541}, { 169, 564}, { 176, 590},
{ 185, 617}, { 193, 644}, { 201, 673}, { 210, 703},
{ 220, 735}, { 230, 767}, { 240, 801}, { 251, 838},
{ 262, 876}, { 274, 914}, { 286, 955}, { 299, 997},
{ 312, 1041}, { 326, 1089}, { 341, 1138}, { 356, 1188},
{ 372, 1241}, { 388, 1297}, { 406, 1354}, { 424, 1415},
{ 443, 1478}, { 462, 1544}, { 483, 1613}, { 505, 1684},
{ 527, 1760}, { 551, 1838}, { 576, 1921}, { 601, 2007},
{ 628, 2097}, { 656, 2190}, { 686, 2288}, { 716, 2389},
{ 748, 2496}, { 781, 2607}, { 816, 2724}, { 853, 2846},
{ 891, 2973}, { 930, 3104}, { 972, 3243}, { 1016, 3389},
{ 1061, 3539}, { 1108, 3698}, { 1158, 3862}, { 1209, 4035},
{ 1264, 4216}, { 1320, 4403}, { 1379, 4599}, { 1441, 4806},
{ 1505, 5019}, { 1572, 5244}, { 1642, 5477}, { 1715, 5722},
{ 1792, 5978}, { 1872, 6245}, { 1955, 6522}, { 2043, 6813},
{ 2134, 7118}, { 2229, 7436}, { 2329, 7767}, { 2432, 8114},
{ 2541, 8477}, { 2655, 8854}, { 2773, 9250}, { 2897, 9663},
{ 3026, 10094}, { 3162, 10546}, { 3303, 11016}, { 3450, 11508},
{ 3604, 12020}, { 3765, 12556}, { 3933, 13118}, { 4108, 13703},
{ 4292, 14315}, { 4483, 14953}, { 4683, 15621}, { 4892, 16318},
{ 5111, 17046}, { 5339, 17807}, { 5577, 18602}, { 5826, 19433},
{ 6086, 20300}, { 6358, 21205}, { 6642, 22152}, { 6938, 23141},
{ 7248, 24173}, { 7571, 25252}, { 7909, 26380}, { 8262, 27557},
{ 8631, 28786}, { 9016, 30072}, { 9419, 31413}, { 9839, 32767},
{ 10278, 32767}, { 10737, 32767}, { 11216, 32767}, { 11717, 32767},
{ 12240, 32767}, { 12786, 32767}, { 13356, 32767}, { 13953, 32767},
{ 14576, 32767}, { 15226, 32767}, { 15906, 32767}, { 16615, 32767}
};
static const struct {
const int16_t *tab1; const int16_t *tab2; int stride;
} tabs[] = {
{MACEtab1, &MACEtab2[0][0], 4},
{MACEtab3, &MACEtab4[0][0], 2},
{MACEtab1, &MACEtab2[0][0], 4}
};
#define QT_8S_2_16S(x) (((x) & 0xFF00) | (((x) >> 8) & 0xFF))
typedef struct ChannelData {
int16_t index, factor, prev2, previous, level;
} ChannelData;
typedef struct MACEContext {
AVFrame frame;
ChannelData chd[2];
} MACEContext;
/**
* MACE version of av_clip_int16(). We have to do this to keep binary
* identical output to the binary decoder.
*/
static inline int16_t mace_broken_clip_int16(int n)
{
if (n > 32767)
return 32767;
else if (n < -32768)
return -32767;
else
return n;
}
static int16_t read_table(ChannelData *chd, uint8_t val, int tab_idx)
{
int16_t current;
if (val < tabs[tab_idx].stride)
current = tabs[tab_idx].tab2[((chd->index & 0x7f0) >> 4) * tabs[tab_idx].stride + val];
else
current = - 1 - tabs[tab_idx].tab2[((chd->index & 0x7f0) >> 4)*tabs[tab_idx].stride + 2*tabs[tab_idx].stride-val-1];
if (( chd->index += tabs[tab_idx].tab1[val]-(chd->index >> 5) ) < 0)
chd->index = 0;
return current;
}
static void chomp3(ChannelData *chd, int16_t *output, uint8_t val,
int tab_idx,
uint32_t numChannels)
{
int16_t current = read_table(chd, val, tab_idx);
current = mace_broken_clip_int16(current + chd->level);
chd->level = current - (current >> 3);
*output = QT_8S_2_16S(current);
}
static void chomp6(ChannelData *chd, int16_t *output, uint8_t val,
int tab_idx,
uint32_t numChannels)
{
int16_t current = read_table(chd, val, tab_idx);
if ((chd->previous ^ current) >= 0) {
chd->factor = FFMIN(chd->factor + 506, 32767);
} else {
if (chd->factor - 314 < -32768)
chd->factor = -32767;
else
chd->factor -= 314;
}
current = mace_broken_clip_int16(current + chd->level);
chd->level = (current*chd->factor) >> 15;
current >>= 1;
output[0] = QT_8S_2_16S(chd->previous + chd->prev2 -
((chd->prev2-current) >> 2));
output[numChannels] = QT_8S_2_16S(chd->previous + current +
((chd->prev2-current) >> 2));
chd->prev2 = chd->previous;
chd->previous = current;
}
static av_cold int mace_decode_init(AVCodecContext * avctx)
{
MACEContext *ctx = avctx->priv_data;
if (avctx->channels > 2)
return -1;
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
avcodec_get_frame_defaults(&ctx->frame);
avctx->coded_frame = &ctx->frame;
return 0;
}
static int mace_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
int16_t *samples;
MACEContext *ctx = avctx->priv_data;
int i, j, k, l, ret;
int is_mace3 = (avctx->codec_id == CODEC_ID_MACE3);
/* get output buffer */
ctx->frame.nb_samples = 3 * (buf_size << (1 - is_mace3)) / avctx->channels;
if ((ret = avctx->get_buffer(avctx, &ctx->frame)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret;
}
samples = (int16_t *)ctx->frame.data[0];
for(i = 0; i < avctx->channels; i++) {
int16_t *output = samples + i;
for (j=0; j < buf_size / (avctx->channels << is_mace3); j++)
for (k=0; k < (1 << is_mace3); k++) {
uint8_t pkt = buf[(i << is_mace3) +
(j*avctx->channels << is_mace3) + k];
uint8_t val[2][3] = {{pkt >> 5, (pkt >> 3) & 3, pkt & 7 },
{pkt & 7 , (pkt >> 3) & 3, pkt >> 5}};
for (l=0; l < 3; l++) {
if (is_mace3)
chomp3(&ctx->chd[i], output, val[1][l], l,
avctx->channels);
else
chomp6(&ctx->chd[i], output, val[0][l], l,
avctx->channels);
output += avctx->channels << (1-is_mace3);
}
}
}
*got_frame_ptr = 1;
*(AVFrame *)data = ctx->frame;
return buf_size;
}
AVCodec ff_mace3_decoder = {
.name = "mace3",
.type = AVMEDIA_TYPE_AUDIO,
.id = CODEC_ID_MACE3,
.priv_data_size = sizeof(MACEContext),
.init = mace_decode_init,
.decode = mace_decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("MACE (Macintosh Audio Compression/Expansion) 3:1"),
};
AVCodec ff_mace6_decoder = {
.name = "mace6",
.type = AVMEDIA_TYPE_AUDIO,
.id = CODEC_ID_MACE6,
.priv_data_size = sizeof(MACEContext),
.init = mace_decode_init,
.decode = mace_decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("MACE (Macintosh Audio Compression/Expansion) 6:1"),
};
|
