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FFmpeg/libavcodec/mace.c
Andreas Rheinhardt 4243da4ff4 avcodec/codec_internal: Use union for FFCodec decode/encode callbacks
This is possible, because every given FFCodec has to implement
exactly one of these. Doing so decreases sizeof(FFCodec) and
therefore decreases the size of the binary.
Notice that in case of position-independent code the decrease
is in .data.rel.ro, so that this translates to decreased
memory consumption.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-04-05 20:02:37 +02:00

315 lines
14 KiB
C

/*
* 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"
#include "codec_internal.h"
#include "internal.h"
#include "libavutil/common.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)
{
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)
{
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[1] = 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->ch_layout.nb_channels > 2 || avctx->ch_layout.nb_channels < 1)
return AVERROR(EINVAL);
avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
return 0;
}
static int mace_decode_frame(AVCodecContext *avctx, AVFrame *frame,
int *got_frame_ptr, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
int channels = avctx->ch_layout.nb_channels;
int16_t **samples;
MACEContext *ctx = avctx->priv_data;
int i, j, k, l, ret;
int is_mace3 = (avctx->codec_id == AV_CODEC_ID_MACE3);
if (buf_size % (channels << is_mace3)) {
av_log(avctx, AV_LOG_ERROR, "buffer size %d is odd\n", buf_size);
buf_size -= buf_size % (channels << is_mace3);
if (!buf_size)
return AVERROR_INVALIDDATA;
}
/* get output buffer */
frame->nb_samples = 3 * (buf_size << (1 - is_mace3)) / channels;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
samples = (int16_t **)frame->extended_data;
for(i = 0; i < channels; i++) {
int16_t *output = samples[i];
for (j=0; j < buf_size / (channels << is_mace3); j++)
for (k=0; k < (1 << is_mace3); k++) {
uint8_t pkt = buf[(i << is_mace3) +
(j * 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);
else
chomp6(&ctx->chd[i], output, val[0][l], l);
output += 1 << (1-is_mace3);
}
}
}
*got_frame_ptr = 1;
return buf_size;
}
const FFCodec ff_mace3_decoder = {
.p.name = "mace3",
.p.long_name = NULL_IF_CONFIG_SMALL("MACE (Macintosh Audio Compression/Expansion) 3:1"),
.p.type = AVMEDIA_TYPE_AUDIO,
.p.id = AV_CODEC_ID_MACE3,
.priv_data_size = sizeof(MACEContext),
.init = mace_decode_init,
FF_CODEC_DECODE_CB(mace_decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1,
.p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
AV_SAMPLE_FMT_NONE },
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
const FFCodec ff_mace6_decoder = {
.p.name = "mace6",
.p.long_name = NULL_IF_CONFIG_SMALL("MACE (Macintosh Audio Compression/Expansion) 6:1"),
.p.type = AVMEDIA_TYPE_AUDIO,
.p.id = AV_CODEC_ID_MACE6,
.priv_data_size = sizeof(MACEContext),
.init = mace_decode_init,
FF_CODEC_DECODE_CB(mace_decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1,
.p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
AV_SAMPLE_FMT_NONE },
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};