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mace.c
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mace.c
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/*
* MACE decoder
* Copyright (c) 2002 Laszlo Torok <torokl@alpha.dfmk.hu>
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; 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 {
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)
{
if (avctx->channels > 2)
return -1;
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
return 0;
}
static int mace_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
int16_t *samples = data;
MACEContext *ctx = avctx->priv_data;
int i, j, k, l;
int out_size;
int is_mace3 = (avctx->codec_id == CODEC_ID_MACE3);
out_size = 3 * (buf_size << (1 - is_mace3)) *
av_get_bytes_per_sample(avctx->sample_fmt);
if (*data_size < out_size) {
av_log(avctx, AV_LOG_ERROR, "Output buffer is too small\n");
return AVERROR(EINVAL);
}
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);
}
}
}
*data_size = out_size;
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,
.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,
.long_name = NULL_IF_CONFIG_SMALL("MACE (Macintosh Audio Compression/Expansion) 6:1"),
};