mace.c
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1 /*
2  * MACE decoder
3  * Copyright (c) 2002 Laszlo Torok <torokl@alpha.dfmk.hu>
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 /**
23  * @file
24  * MACE decoder.
25  */
26 
27 #include "avcodec.h"
28 #include "internal.h"
29 #include "libavutil/common.h"
30 
31 /*
32  * Adapted to libavcodec by Francois Revol <revol@free.fr>
33  * (removed 68k REG stuff, changed types, added some statics and consts,
34  * libavcodec api, context stuff, interlaced stereo out).
35  */
36 
37 static const int16_t MACEtab1[] = {-13, 8, 76, 222, 222, 76, 8, -13};
38 
39 static const int16_t MACEtab3[] = {-18, 140, 140, -18};
40 
41 static const int16_t MACEtab2[][4] = {
42  { 37, 116, 206, 330}, { 39, 121, 216, 346},
43  { 41, 127, 225, 361}, { 42, 132, 235, 377},
44  { 44, 137, 245, 392}, { 46, 144, 256, 410},
45  { 48, 150, 267, 428}, { 51, 157, 280, 449},
46  { 53, 165, 293, 470}, { 55, 172, 306, 490},
47  { 58, 179, 319, 511}, { 60, 187, 333, 534},
48  { 63, 195, 348, 557}, { 66, 205, 364, 583},
49  { 69, 214, 380, 609}, { 72, 223, 396, 635},
50  { 75, 233, 414, 663}, { 79, 244, 433, 694},
51  { 82, 254, 453, 725}, { 86, 265, 472, 756},
52  { 90, 278, 495, 792}, { 94, 290, 516, 826},
53  { 98, 303, 538, 862}, { 102, 316, 562, 901},
54  { 107, 331, 588, 942}, { 112, 345, 614, 983},
55  { 117, 361, 641, 1027}, { 122, 377, 670, 1074},
56  { 127, 394, 701, 1123}, { 133, 411, 732, 1172},
57  { 139, 430, 764, 1224}, { 145, 449, 799, 1280},
58  { 152, 469, 835, 1337}, { 159, 490, 872, 1397},
59  { 166, 512, 911, 1459}, { 173, 535, 951, 1523},
60  { 181, 558, 993, 1590}, { 189, 584, 1038, 1663},
61  { 197, 610, 1085, 1738}, { 206, 637, 1133, 1815},
62  { 215, 665, 1183, 1895}, { 225, 695, 1237, 1980},
63  { 235, 726, 1291, 2068}, { 246, 759, 1349, 2161},
64  { 257, 792, 1409, 2257}, { 268, 828, 1472, 2357},
65  { 280, 865, 1538, 2463}, { 293, 903, 1606, 2572},
66  { 306, 944, 1678, 2688}, { 319, 986, 1753, 2807},
67  { 334, 1030, 1832, 2933}, { 349, 1076, 1914, 3065},
68  { 364, 1124, 1999, 3202}, { 380, 1174, 2088, 3344},
69  { 398, 1227, 2182, 3494}, { 415, 1281, 2278, 3649},
70  { 434, 1339, 2380, 3811}, { 453, 1398, 2486, 3982},
71  { 473, 1461, 2598, 4160}, { 495, 1526, 2714, 4346},
72  { 517, 1594, 2835, 4540}, { 540, 1665, 2961, 4741},
73  { 564, 1740, 3093, 4953}, { 589, 1818, 3232, 5175},
74  { 615, 1898, 3375, 5405}, { 643, 1984, 3527, 5647},
75  { 671, 2072, 3683, 5898}, { 701, 2164, 3848, 6161},
76  { 733, 2261, 4020, 6438}, { 766, 2362, 4199, 6724},
77  { 800, 2467, 4386, 7024}, { 836, 2578, 4583, 7339},
78  { 873, 2692, 4786, 7664}, { 912, 2813, 5001, 8008},
79  { 952, 2938, 5223, 8364}, { 995, 3070, 5457, 8739},
80  { 1039, 3207, 5701, 9129}, { 1086, 3350, 5956, 9537},
81  { 1134, 3499, 6220, 9960}, { 1185, 3655, 6497, 10404},
82  { 1238, 3818, 6788, 10869}, { 1293, 3989, 7091, 11355},
83  { 1351, 4166, 7407, 11861}, { 1411, 4352, 7738, 12390},
84  { 1474, 4547, 8084, 12946}, { 1540, 4750, 8444, 13522},
85  { 1609, 4962, 8821, 14126}, { 1680, 5183, 9215, 14756},
86  { 1756, 5415, 9626, 15415}, { 1834, 5657, 10057, 16104},
87  { 1916, 5909, 10505, 16822}, { 2001, 6173, 10975, 17574},
88  { 2091, 6448, 11463, 18356}, { 2184, 6736, 11974, 19175},
89  { 2282, 7037, 12510, 20032}, { 2383, 7351, 13068, 20926},
90  { 2490, 7679, 13652, 21861}, { 2601, 8021, 14260, 22834},
91  { 2717, 8380, 14897, 23854}, { 2838, 8753, 15561, 24918},
92  { 2965, 9144, 16256, 26031}, { 3097, 9553, 16982, 27193},
93  { 3236, 9979, 17740, 28407}, { 3380, 10424, 18532, 29675},
94  { 3531, 10890, 19359, 31000}, { 3688, 11375, 20222, 32382},
95  { 3853, 11883, 21125, 32767}, { 4025, 12414, 22069, 32767},
96  { 4205, 12967, 23053, 32767}, { 4392, 13546, 24082, 32767},
97  { 4589, 14151, 25157, 32767}, { 4793, 14783, 26280, 32767},
98  { 5007, 15442, 27452, 32767}, { 5231, 16132, 28678, 32767},
99  { 5464, 16851, 29957, 32767}, { 5708, 17603, 31294, 32767},
100  { 5963, 18389, 32691, 32767}, { 6229, 19210, 32767, 32767},
101  { 6507, 20067, 32767, 32767}, { 6797, 20963, 32767, 32767},
102  { 7101, 21899, 32767, 32767}, { 7418, 22876, 32767, 32767},
103  { 7749, 23897, 32767, 32767}, { 8095, 24964, 32767, 32767},
104  { 8456, 26078, 32767, 32767}, { 8833, 27242, 32767, 32767},
105  { 9228, 28457, 32767, 32767}, { 9639, 29727, 32767, 32767}
106 };
107 
108 static const int16_t MACEtab4[][2] = {
109  { 64, 216}, { 67, 226}, { 70, 236}, { 74, 246},
110  { 77, 257}, { 80, 268}, { 84, 280}, { 88, 294},
111  { 92, 307}, { 96, 321}, { 100, 334}, { 104, 350},
112  { 109, 365}, { 114, 382}, { 119, 399}, { 124, 416},
113  { 130, 434}, { 136, 454}, { 142, 475}, { 148, 495},
114  { 155, 519}, { 162, 541}, { 169, 564}, { 176, 590},
115  { 185, 617}, { 193, 644}, { 201, 673}, { 210, 703},
116  { 220, 735}, { 230, 767}, { 240, 801}, { 251, 838},
117  { 262, 876}, { 274, 914}, { 286, 955}, { 299, 997},
118  { 312, 1041}, { 326, 1089}, { 341, 1138}, { 356, 1188},
119  { 372, 1241}, { 388, 1297}, { 406, 1354}, { 424, 1415},
120  { 443, 1478}, { 462, 1544}, { 483, 1613}, { 505, 1684},
121  { 527, 1760}, { 551, 1838}, { 576, 1921}, { 601, 2007},
122  { 628, 2097}, { 656, 2190}, { 686, 2288}, { 716, 2389},
123  { 748, 2496}, { 781, 2607}, { 816, 2724}, { 853, 2846},
124  { 891, 2973}, { 930, 3104}, { 972, 3243}, { 1016, 3389},
125  { 1061, 3539}, { 1108, 3698}, { 1158, 3862}, { 1209, 4035},
126  { 1264, 4216}, { 1320, 4403}, { 1379, 4599}, { 1441, 4806},
127  { 1505, 5019}, { 1572, 5244}, { 1642, 5477}, { 1715, 5722},
128  { 1792, 5978}, { 1872, 6245}, { 1955, 6522}, { 2043, 6813},
129  { 2134, 7118}, { 2229, 7436}, { 2329, 7767}, { 2432, 8114},
130  { 2541, 8477}, { 2655, 8854}, { 2773, 9250}, { 2897, 9663},
131  { 3026, 10094}, { 3162, 10546}, { 3303, 11016}, { 3450, 11508},
132  { 3604, 12020}, { 3765, 12556}, { 3933, 13118}, { 4108, 13703},
133  { 4292, 14315}, { 4483, 14953}, { 4683, 15621}, { 4892, 16318},
134  { 5111, 17046}, { 5339, 17807}, { 5577, 18602}, { 5826, 19433},
135  { 6086, 20300}, { 6358, 21205}, { 6642, 22152}, { 6938, 23141},
136  { 7248, 24173}, { 7571, 25252}, { 7909, 26380}, { 8262, 27557},
137  { 8631, 28786}, { 9016, 30072}, { 9419, 31413}, { 9839, 32767},
138  { 10278, 32767}, { 10737, 32767}, { 11216, 32767}, { 11717, 32767},
139  { 12240, 32767}, { 12786, 32767}, { 13356, 32767}, { 13953, 32767},
140  { 14576, 32767}, { 15226, 32767}, { 15906, 32767}, { 16615, 32767}
141 };
142 
143 static const struct {
144  const int16_t *tab1; const int16_t *tab2; int stride;
145 } tabs[] = {
146  {MACEtab1, &MACEtab2[0][0], 4},
147  {MACEtab3, &MACEtab4[0][0], 2},
148  {MACEtab1, &MACEtab2[0][0], 4}
149 };
150 
151 #define QT_8S_2_16S(x) (((x) & 0xFF00) | (((x) >> 8) & 0xFF))
152 
153 typedef struct ChannelData {
154  int16_t index, factor, prev2, previous, level;
155 } ChannelData;
156 
157 typedef struct MACEContext {
158  ChannelData chd[2];
159 } MACEContext;
160 
161 /**
162  * MACE version of av_clip_int16(). We have to do this to keep binary
163  * identical output to the binary decoder.
164  */
165 static inline int16_t mace_broken_clip_int16(int n)
166 {
167  if (n > 32767)
168  return 32767;
169  else if (n < -32768)
170  return -32767;
171  else
172  return n;
173 }
174 
175 static int16_t read_table(ChannelData *chd, uint8_t val, int tab_idx)
176 {
177  int16_t current;
178 
179  if (val < tabs[tab_idx].stride)
180  current = tabs[tab_idx].tab2[((chd->index & 0x7f0) >> 4) * tabs[tab_idx].stride + val];
181  else
182  current = - 1 - tabs[tab_idx].tab2[((chd->index & 0x7f0) >> 4)*tabs[tab_idx].stride + 2*tabs[tab_idx].stride-val-1];
183 
184  if (( chd->index += tabs[tab_idx].tab1[val]-(chd->index >> 5) ) < 0)
185  chd->index = 0;
186 
187  return current;
188 }
189 
190 static void chomp3(ChannelData *chd, int16_t *output, uint8_t val, int tab_idx)
191 {
192 
193  int16_t current = read_table(chd, val, tab_idx);
194 
195  current = mace_broken_clip_int16(current + chd->level);
196 
197  chd->level = current - (current >> 3);
198  *output = QT_8S_2_16S(current);
199 }
200 
201 static void chomp6(ChannelData *chd, int16_t *output, uint8_t val, int tab_idx)
202 {
203  int16_t current = read_table(chd, val, tab_idx);
204 
205  if ((chd->previous ^ current) >= 0) {
206  chd->factor = FFMIN(chd->factor + 506, 32767);
207  } else {
208  if (chd->factor - 314 < -32768)
209  chd->factor = -32767;
210  else
211  chd->factor -= 314;
212  }
213 
214  current = mace_broken_clip_int16(current + chd->level);
215 
216  chd->level = (current*chd->factor) >> 15;
217  current >>= 1;
218 
219  output[0] = QT_8S_2_16S(chd->previous + chd->prev2 -
220  ((chd->prev2-current) >> 2));
221  output[1] = QT_8S_2_16S(chd->previous + current +
222  ((chd->prev2-current) >> 2));
223  chd->prev2 = chd->previous;
224  chd->previous = current;
225 }
226 
227 static av_cold int mace_decode_init(AVCodecContext * avctx)
228 {
229  if (avctx->channels > 2 || avctx->channels <= 0)
230  return -1;
231  avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
232 
233  return 0;
234 }
235 
236 static int mace_decode_frame(AVCodecContext *avctx, void *data,
237  int *got_frame_ptr, AVPacket *avpkt)
238 {
239  AVFrame *frame = data;
240  const uint8_t *buf = avpkt->data;
241  int buf_size = avpkt->size;
242  int16_t **samples;
243  MACEContext *ctx = avctx->priv_data;
244  int i, j, k, l, ret;
245  int is_mace3 = (avctx->codec_id == AV_CODEC_ID_MACE3);
246 
247  /* get output buffer */
248  frame->nb_samples = 3 * (buf_size << (1 - is_mace3)) / avctx->channels;
249  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
250  return ret;
251  samples = (int16_t **)frame->extended_data;
252 
253  for(i = 0; i < avctx->channels; i++) {
254  int16_t *output = samples[i];
255 
256  for (j=0; j < buf_size / (avctx->channels << is_mace3); j++)
257  for (k=0; k < (1 << is_mace3); k++) {
258  uint8_t pkt = buf[(i << is_mace3) +
259  (j*avctx->channels << is_mace3) + k];
260 
261  uint8_t val[2][3] = {{pkt >> 5, (pkt >> 3) & 3, pkt & 7 },
262  {pkt & 7 , (pkt >> 3) & 3, pkt >> 5}};
263 
264  for (l=0; l < 3; l++) {
265  if (is_mace3)
266  chomp3(&ctx->chd[i], output, val[1][l], l);
267  else
268  chomp6(&ctx->chd[i], output, val[0][l], l);
269 
270  output += 1 << (1-is_mace3);
271  }
272  }
273  }
274 
275  *got_frame_ptr = 1;
276 
277  return buf_size;
278 }
279 
280 AVCodec ff_mace3_decoder = {
281  .name = "mace3",
282  .type = AVMEDIA_TYPE_AUDIO,
283  .id = AV_CODEC_ID_MACE3,
284  .priv_data_size = sizeof(MACEContext),
285  .init = mace_decode_init,
286  .decode = mace_decode_frame,
287  .capabilities = CODEC_CAP_DR1,
288  .long_name = NULL_IF_CONFIG_SMALL("MACE (Macintosh Audio Compression/Expansion) 3:1"),
289  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
290  AV_SAMPLE_FMT_NONE },
291 };
292 
293 AVCodec ff_mace6_decoder = {
294  .name = "mace6",
295  .type = AVMEDIA_TYPE_AUDIO,
296  .id = AV_CODEC_ID_MACE6,
297  .priv_data_size = sizeof(MACEContext),
298  .init = mace_decode_init,
299  .decode = mace_decode_frame,
300  .capabilities = CODEC_CAP_DR1,
301  .long_name = NULL_IF_CONFIG_SMALL("MACE (Macintosh Audio Compression/Expansion) 6:1"),
302  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
303  AV_SAMPLE_FMT_NONE },
304 };
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:76
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
MACEtab1
static const int16_t MACEtab1[]
Definition: mace.c:37
MACEtab3
static const int16_t MACEtab3[]
Definition: mace.c:39
ChannelData::level
int16_t level
Definition: mace.c:154
stride
int stride
Definition: mace.c:144
AV_CODEC_ID_MACE6
Definition: libavcodec/avcodec.h:391
AVCodecContext::sample_fmt
enum AVSampleFormat sample_fmt
audio sample format
Definition: libavcodec/avcodec.h:1869
uint8_t
uint8_t
Definition: audio_convert.c:194
av_cold
#define av_cold
Definition: attributes.h:78
tabs
static const struct @78 tabs[]
chomp6
static void chomp6(ChannelData *chd, int16_t *output, uint8_t val, int tab_idx)
Definition: mace.c:201
pkt
static AVPacket pkt
Definition: demuxing.c:56
mace_decode_frame
static int mace_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Definition: mace.c:236
CODEC_CAP_DR1
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: libavcodec/avcodec.h:743
AVPacket::data
uint8_t * data
Definition: libavcodec/avcodec.h:1051
MACEContext
struct MACEContext MACEContext
frame
frame
Definition: stft.m:14
chomp3
static void chomp3(ChannelData *chd, int16_t *output, uint8_t val, int tab_idx)
Definition: mace.c:190
AV_CODEC_ID_MACE3
Definition: libavcodec/avcodec.h:390
ff_mace3_decoder
AVCodec ff_mace3_decoder
Definition: mace.c:280
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: libavutil/internal.h:123
data
Spectrum Plot time data
Definition: FFT of a Simple Sinusoid.m:14
read_table
static int16_t read_table(ChannelData *chd, uint8_t val, int tab_idx)
Definition: mace.c:175
AVMEDIA_TYPE_AUDIO
Definition: avutil.h:144
AVCodec::name
const char * name
Name of the codec implementation.
Definition: libavcodec/avcodec.h:2861
avcodec.h
external API header
mace_decode_init
static av_cold int mace_decode_init(AVCodecContext *avctx)
Definition: mace.c:227
ChannelData::index
int16_t index
Definition: mace.c:154
FFMIN
#define FFMIN(a, b)
Definition: common.h:58
ret
ret
Definition: avfilter.c:821
MACEtab2
static const int16_t MACEtab2[][4]
Definition: mace.c:41
ChannelData
struct ChannelData ChannelData
k
for k
Definition: genspecsines_sin.m:6
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition: libavcodec/avcodec.h:1145
AVCodecContext
main external API structure.
Definition: libavcodec/avcodec.h:1134
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: libavcodec/utils.c:823
buf
void * buf
Definition: avisynth_c.h:594
tab1
const int16_t * tab1
Definition: mace.c:144
i
synthesis window for stochastic i
Definition: code Kat/hpsmodel.m:34
ChannelData::previous
int16_t previous
Definition: mace.c:154
ChannelData::factor
int16_t factor
Definition: mace.c:154
n
n
Definition: genspecsines_sin.m:10
internal.h
common internal api header.
common.h
common internal and external API header
AVSampleFormat
AVSampleFormat
Audio Sample Formats.
Definition: samplefmt.h:49
output
these buffered frames must be flushed immediately if a new input produces new output(Example:frame rate-doubling filter:filter_frame must(1) flush the second copy of the previous frame, if it is still there,(2) push the first copy of the incoming frame,(3) keep the second copy for later.) If the input frame is not enough to produce output
MACEContext::chd
ChannelData chd[2]
Definition: mace.c:158
AVCodecContext::channels
int channels
number of audio channels
Definition: libavcodec/avcodec.h:1862
mace_broken_clip_int16
static int16_t mace_broken_clip_int16(int n)
MACE version of av_clip_int16().
Definition: mace.c:165
AV_SAMPLE_FMT_S16P
signed 16 bits, planar
Definition: samplefmt.h:58
samples
Filter the word “frame” indicates either a video frame or a group of audio samples
Definition: filter_design.txt:2
decode
static int decode(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: crystalhd.c:868
ChannelData::prev2
int16_t prev2
Definition: mace.c:154
ff_mace6_decoder
AVCodec ff_mace6_decoder
Definition: mace.c:293
AVFrame::extended_data
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:117
AVPacket
This structure stores compressed data.
Definition: libavcodec/avcodec.h:1028
AVFrame::nb_samples
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:127
QT_8S_2_16S
#define QT_8S_2_16S(x)
Definition: mace.c:151
tab2
const int16_t * tab2
Definition: mace.c:144
MACEtab4
static const int16_t MACEtab4[][2]
Definition: mace.c:108
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