FFmpeg
mace.c
Go to the documentation of this file.
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 < 1)
230  return AVERROR(EINVAL);
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  if (buf_size % (avctx->channels << is_mace3)) {
248  av_log(avctx, AV_LOG_ERROR, "buffer size %d is odd\n", buf_size);
249  buf_size -= buf_size % (avctx->channels << is_mace3);
250  if (!buf_size)
251  return AVERROR_INVALIDDATA;
252  }
253 
254  /* get output buffer */
255  frame->nb_samples = 3 * (buf_size << (1 - is_mace3)) / avctx->channels;
256  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
257  return ret;
258  samples = (int16_t **)frame->extended_data;
259 
260  for(i = 0; i < avctx->channels; i++) {
261  int16_t *output = samples[i];
262 
263  for (j=0; j < buf_size / (avctx->channels << is_mace3); j++)
264  for (k=0; k < (1 << is_mace3); k++) {
265  uint8_t pkt = buf[(i << is_mace3) +
266  (j*avctx->channels << is_mace3) + k];
267 
268  uint8_t val[2][3] = {{pkt >> 5, (pkt >> 3) & 3, pkt & 7 },
269  {pkt & 7 , (pkt >> 3) & 3, pkt >> 5}};
270 
271  for (l=0; l < 3; l++) {
272  if (is_mace3)
273  chomp3(&ctx->chd[i], output, val[1][l], l);
274  else
275  chomp6(&ctx->chd[i], output, val[0][l], l);
276 
277  output += 1 << (1-is_mace3);
278  }
279  }
280  }
281 
282  *got_frame_ptr = 1;
283 
284  return buf_size;
285 }
286 
287 const AVCodec ff_mace3_decoder = {
288  .name = "mace3",
289  .long_name = NULL_IF_CONFIG_SMALL("MACE (Macintosh Audio Compression/Expansion) 3:1"),
290  .type = AVMEDIA_TYPE_AUDIO,
291  .id = AV_CODEC_ID_MACE3,
292  .priv_data_size = sizeof(MACEContext),
293  .init = mace_decode_init,
294  .decode = mace_decode_frame,
295  .capabilities = AV_CODEC_CAP_DR1,
296  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
297  AV_SAMPLE_FMT_NONE },
298  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
299 };
300 
301 const AVCodec ff_mace6_decoder = {
302  .name = "mace6",
303  .long_name = NULL_IF_CONFIG_SMALL("MACE (Macintosh Audio Compression/Expansion) 6:1"),
304  .type = AVMEDIA_TYPE_AUDIO,
305  .id = AV_CODEC_ID_MACE6,
306  .priv_data_size = sizeof(MACEContext),
307  .init = mace_decode_init,
308  .decode = mace_decode_frame,
309  .capabilities = AV_CODEC_CAP_DR1,
310  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
311  AV_SAMPLE_FMT_NONE },
312  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
313 };
chomp6
static void chomp6(ChannelData *chd, int16_t *output, uint8_t val, int tab_idx)
Definition: mace.c:201
AV_CODEC_ID_MACE6
@ AV_CODEC_ID_MACE6
Definition: codec_id.h:432
AVCodec
AVCodec.
Definition: codec.h:197
stride
int stride
Definition: mace.c:144
FF_CODEC_CAP_INIT_THREADSAFE
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:41
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
ff_mace3_decoder
const AVCodec ff_mace3_decoder
Definition: mace.c:287
sample_fmts
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:953
tabs
static const struct @94 tabs[]
output
filter_frame For filters that do not use the this method is called when a frame is pushed to the filter s input It can be called at any time except in a reentrant way If the input frame is enough to produce output
Definition: filter_design.txt:225
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:365
data
const char data[16]
Definition: mxf.c:142
MACEtab4
static const int16_t MACEtab4[][2]
Definition: mace.c:108
mace_broken_clip_int16
static int16_t mace_broken_clip_int16(int n)
MACE version of av_clip_int16().
Definition: mace.c:165
ChannelData::index
int16_t index
Definition: mace.c:154
chomp3
static void chomp3(ChannelData *chd, int16_t *output, uint8_t val, int tab_idx)
Definition: mace.c:190
ChannelData::prev2
int16_t prev2
Definition: mace.c:154
QT_8S_2_16S
#define QT_8S_2_16S(x)
Definition: mace.c:151
val
static double val(void *priv, double ch)
Definition: aeval.c:76
tab2
const int16_t * tab2
Definition: mace.c:144
tab1
const int16_t * tab1
Definition: mace.c:144
ChannelData
Definition: mace.c:153
MACEtab2
static const int16_t MACEtab2[][4]
Definition: mace.c:41
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:181
AV_CODEC_ID_MACE3
@ AV_CODEC_ID_MACE3
Definition: codec_id.h:431
av_cold
#define av_cold
Definition: attributes.h:90
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
ctx
AVFormatContext * ctx
Definition: movenc.c:48
channels
channels
Definition: aptx.h:33
ChannelData::previous
int16_t previous
Definition: mace.c:154
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition: avcodec.h:394
MACEContext
Definition: mace.c:157
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1645
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
AVPacket::size
int size
Definition: packet.h:366
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
AVCodecContext::sample_fmt
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:989
AV_SAMPLE_FMT_NONE
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:59
FFMIN
#define FFMIN(a, b)
Definition: common.h:105
AV_SAMPLE_FMT_S16P
@ AV_SAMPLE_FMT_S16P
signed 16 bits, planar
Definition: samplefmt.h:67
AVCodecContext::channels
int channels
number of audio channels
Definition: avcodec.h:982
i
int i
Definition: input.c:407
common.h
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:204
ff_mace6_decoder
const AVCodec ff_mace6_decoder
Definition: mace.c:301
mace_decode_init
static av_cold int mace_decode_init(AVCodecContext *avctx)
Definition: mace.c:227
avcodec.h
ChannelData::factor
int16_t factor
Definition: mace.c:154
ret
ret
Definition: filter_design.txt:187
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
AVCodecContext
main external API structure.
Definition: avcodec.h:384
ChannelData::level
int16_t level
Definition: mace.c:154
read_table
static int16_t read_table(ChannelData *chd, uint8_t val, int tab_idx)
Definition: mace.c:175
MACEtab1
static const int16_t MACEtab1[]
Definition: mace.c:37
samples
Filter the word “frame” indicates either a video frame or a group of audio samples
Definition: filter_design.txt:8
MACEContext::chd
ChannelData chd[2]
Definition: mace.c:158
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:411
AVPacket
This structure stores compressed data.
Definition: packet.h:342
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
MACEtab3
static const int16_t MACEtab3[]
Definition: mace.c:39
mace_decode_frame
static int mace_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Definition: mace.c:236
Generated on Tue Jun 22 2021 19:21:20 for FFmpeg by   doxygen 1.8.17