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FFmpeg/libavcodec/ylc.c
Andreas Rheinhardt 21b23ceab3 avcodec: Make init-threadsafety the default 
and remove FF_CODEC_CAP_INIT_THREADSAFE
All our native codecs are already init-threadsafe
(only wrappers for external libraries and hwaccels
are typically not marked as init-threadsafe yet),
so it is only natural for this to also be the default state.

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-07-18 20:04:59 +02:00

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/*
* YUY2 Lossless Codec
*
* 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
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define YLC_VLC_BITS 10
#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mem.h"
#include "avcodec.h"
#include "bswapdsp.h"
#include "codec_internal.h"
#include "get_bits.h"
#include "huffyuvdsp.h"
#include "thread.h"
#include "unary.h"
typedef struct YLCContext {
VLC vlc[4];
uint32_t table[256];
uint8_t *buffer;
int buffer_size;
BswapDSPContext bdsp;
} YLCContext;
static av_cold int decode_init(AVCodecContext *avctx)
{
YLCContext *s = avctx->priv_data;
avctx->pix_fmt = AV_PIX_FMT_YUYV422;
ff_bswapdsp_init(&s->bdsp);
return 0;
}
typedef struct Node {
int16_t sym;
uint32_t count;
int16_t l, r;
} Node;
static void get_tree_codes(uint32_t *bits, int16_t *lens, uint8_t *xlat,
Node *nodes, int node,
uint32_t pfx, int pl, int *pos)
{
int s;
s = nodes[node].sym;
if (s != -1) {
bits[*pos] = (~pfx) & ((1ULL << FFMAX(pl, 1)) - 1);
lens[*pos] = FFMAX(pl, 1);
xlat[*pos] = s + (pl == 0);
(*pos)++;
} else {
pfx <<= 1;
pl++;
get_tree_codes(bits, lens, xlat, nodes, nodes[node].l, pfx, pl,
pos);
pfx |= 1;
get_tree_codes(bits, lens, xlat, nodes, nodes[node].r, pfx, pl,
pos);
}
}
static int build_vlc(AVCodecContext *avctx, VLC *vlc, const uint32_t *table)
{
Node nodes[512];
uint32_t bits[256];
int16_t lens[256];
uint8_t xlat[256];
int cur_node, i, j, pos = 0;
ff_free_vlc(vlc);
for (i = 0; i < 256; i++) {
nodes[i].count = table[i];
nodes[i].sym = i;
nodes[i].l = i;
nodes[i].r = i;
}
cur_node = 256;
j = 0;
do {
for (i = 0; ; i++) {
int new_node = j;
int first_node = cur_node;
int second_node = cur_node;
unsigned nd, st;
nodes[cur_node].count = -1;
do {
int val = nodes[new_node].count;
if (val && (val < nodes[first_node].count)) {
if (val >= nodes[second_node].count) {
first_node = new_node;
} else {
first_node = second_node;
second_node = new_node;
}
}
new_node += 1;
} while (new_node != cur_node);
if (first_node == cur_node)
break;
nd = nodes[second_node].count;
st = nodes[first_node].count;
nodes[second_node].count = 0;
nodes[first_node].count = 0;
if (nd >= UINT32_MAX - st) {
av_log(avctx, AV_LOG_ERROR, "count overflow\n");
return AVERROR_INVALIDDATA;
}
nodes[cur_node].count = nd + st;
nodes[cur_node].sym = -1;
nodes[cur_node].l = first_node;
nodes[cur_node].r = second_node;
cur_node++;
}
j++;
} while (cur_node - 256 == j);
get_tree_codes(bits, lens, xlat, nodes, cur_node - 1, 0, 0, &pos);
return ff_init_vlc_sparse(vlc, YLC_VLC_BITS, pos, lens, 2, 2,
bits, 4, 4, xlat, 1, 1, 0);
}
static const uint8_t table_y1[] = {
0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x02,
0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
0x02, 0x00,
};
static const uint8_t table_u[] = {
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x00,
};
static const uint8_t table_y2[] = {
0xFC, 0xFC, 0xFC, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE,
0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0xFC,
0xFC, 0xFC, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE, 0xFE,
0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0xFC, 0xFC,
0xFC, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE, 0xFE, 0xFF,
0xFF, 0xFF, 0x00, 0x00, 0x00, 0xFD, 0xFD, 0xFD,
0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00,
0x00, 0x01, 0x01, 0x01, 0xFD, 0xFD, 0xFD, 0xFE,
0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00,
0x01, 0x01, 0x01, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE,
0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x01,
0x01, 0x01, 0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF,
0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x02, 0x02,
0x02, 0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0x00,
0x00, 0x00, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02,
0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00,
0x00, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0xFF,
0xFF, 0xFF, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01,
0x02, 0x02, 0x02, 0x03, 0x03, 0x03, 0xFF, 0xFF,
0xFF, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x02,
0x02, 0x02, 0x03, 0x03, 0x03, 0xFF, 0xFF, 0xFF,
0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x02, 0x02,
0x02, 0x03, 0x03, 0x03, 0x00, 0x00, 0x00, 0x01,
0x01, 0x01, 0x02, 0x02, 0x02, 0x03, 0x03, 0x03,
0x04, 0x04, 0x04, 0x00, 0x00, 0x00, 0x01, 0x01,
0x01, 0x02, 0x02, 0x02, 0x03, 0x03, 0x03, 0x04,
0x04, 0x04, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01,
0x02, 0x02, 0x02, 0x03, 0x03, 0x03, 0x04, 0x04,
0x04, 0x00,
};
static const uint8_t table_v[] = {
0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
0x01, 0x00,
};
static int decode_frame(AVCodecContext *avctx, AVFrame *p,
int *got_frame, AVPacket *avpkt)
{
int TL[4] = { 128, 128, 128, 128 };
int L[4] = { 128, 128, 128, 128 };
YLCContext *s = avctx->priv_data;
const uint8_t *buf = avpkt->data;
int ret, x, y, toffset, boffset;
GetBitContext gb;
uint8_t *dst;
if (avpkt->size <= 16)
return AVERROR_INVALIDDATA;
if (AV_RL32(buf) != MKTAG('Y', 'L', 'C', '0') ||
AV_RL32(buf + 4) != 0)
return AVERROR_INVALIDDATA;
toffset = AV_RL32(buf + 8);
if (toffset < 16 || toffset >= avpkt->size)
return AVERROR_INVALIDDATA;
boffset = AV_RL32(buf + 12);
if (toffset >= boffset || boffset >= avpkt->size)
return AVERROR_INVALIDDATA;
if ((ret = ff_thread_get_buffer(avctx, p, 0)) < 0)
return ret;
av_fast_malloc(&s->buffer, &s->buffer_size,
FFMAX(boffset - toffset, avpkt->size - boffset)
+ AV_INPUT_BUFFER_PADDING_SIZE);
if (!s->buffer)
return AVERROR(ENOMEM);
memcpy(s->buffer, avpkt->data + toffset, boffset - toffset);
memset(s->buffer + boffset - toffset, 0, AV_INPUT_BUFFER_PADDING_SIZE);
s->bdsp.bswap_buf((uint32_t *) s->buffer,
(uint32_t *) s->buffer,
(boffset - toffset + 3) >> 2);
if ((ret = init_get_bits8(&gb, s->buffer, boffset - toffset)) < 0)
return ret;
for (int i = 0; i < 4; i++) {
for (x = 0; x < 256; x++) {
unsigned len = get_unary(&gb, 1, 31);
uint32_t val = ((1U << len) - 1) + get_bits_long(&gb, len);
s->table[x] = val;
}
ret = build_vlc(avctx, &s->vlc[i], s->table);
if (ret < 0)
return ret;
}
memcpy(s->buffer, avpkt->data + boffset, avpkt->size - boffset);
memset(s->buffer + avpkt->size - boffset, 0, AV_INPUT_BUFFER_PADDING_SIZE);
s->bdsp.bswap_buf((uint32_t *) s->buffer,
(uint32_t *) s->buffer,
(avpkt->size - boffset) >> 2);
if ((ret = init_get_bits8(&gb, s->buffer, avpkt->size - boffset)) < 0)
return ret;
dst = p->data[0];
for (y = 0; y < avctx->height; y++) {
memset(dst, 0, avctx->width * 2);
dst += p->linesize[0];
}
dst = p->data[0];
for (y = 0; y < avctx->height; y++) {
for (x = 0; x < avctx->width * 2 && y < avctx->height;) {
if (get_bits_left(&gb) <= 0)
return AVERROR_INVALIDDATA;
if (get_bits1(&gb)) {
int val = get_vlc2(&gb, s->vlc[0].table, YLC_VLC_BITS, 3);
if (val < 0) {
return AVERROR_INVALIDDATA;
} else if (val < 0xE1) {
dst[x ] = table_y1[val];
dst[x + 1] = table_u[val];
dst[x + 2] = table_y2[val];
dst[x + 3] = table_v[val];
x += 4;
} else {
int incr = (val - 0xDF) * 4;
if (x + incr >= avctx->width * 2) {
int iy = ((x + incr) / (avctx->width * 2));
x = (x + incr) % (avctx->width * 2);
y += iy;
dst += iy * p->linesize[0];
} else {
x += incr;
}
}
} else {
int y1, y2, u, v;
y1 = get_vlc2(&gb, s->vlc[1].table, YLC_VLC_BITS, 3);
u = get_vlc2(&gb, s->vlc[2].table, YLC_VLC_BITS, 3);
y2 = get_vlc2(&gb, s->vlc[1].table, YLC_VLC_BITS, 3);
v = get_vlc2(&gb, s->vlc[3].table, YLC_VLC_BITS, 3);
if (y1 < 0 || y2 < 0 || u < 0 || v < 0)
return AVERROR_INVALIDDATA;
dst[x ] = y1;
dst[x + 1] = u;
dst[x + 2] = y1 + y2;
dst[x + 3] = v;
x += 4;
}
}
dst += p->linesize[0];
}
dst = p->data[0];
for (x = 0; x < avctx->width * 2; x += 4) {
dst[x ] = dst[x ] + L[0];
dst[x + 2] = L[0] = dst[x + 2] + L[0];
L[1] = dst[x + 1] + L[1];
dst[x + 1] = L[1];
L[2] = dst[x + 3] + L[2];
dst[x + 3] = L[2];
}
dst += p->linesize[0];
for (y = 1; y < avctx->height; y++) {
x = 0;
dst[x ] = dst[x ] + L[0] + dst[x + 0 - p->linesize[0]] - TL[0];
dst[x + 2] = L[0] = dst[x + 2] + L[0] + dst[x + 2 - p->linesize[0]] - TL[0];
TL[0] = dst[x + 2 - p->linesize[0]];
L[1] = dst[x + 1] + L[1] + dst[x + 1 - p->linesize[0]] - TL[1];
dst[x + 1] = L[1];
TL[1] = dst[x + 1 - p->linesize[0]];
L[2] = dst[x + 3] + L[2] + dst[x + 3 - p->linesize[0]] - TL[2];
dst[x + 3] = L[2];
TL[2] = dst[x + 3 - p->linesize[0]];
for (x = 4; x < avctx->width * 2; x += 4) {
dst[x ] = dst[x ] + L[0] + dst[x + 0 - p->linesize[0]] - TL[0];
dst[x + 2] = L[0] = dst[x + 2] + L[0] + dst[x + 2 - p->linesize[0]] - TL[0];
TL[0] = dst[x + 2 - p->linesize[0]];
L[1] = dst[x + 1] + L[1] + dst[x + 1 - p->linesize[0]] - TL[1];
dst[x + 1] = L[1];
TL[1] = dst[x + 1 - p->linesize[0]];
L[2] = dst[x + 3] + L[2] + dst[x + 3 - p->linesize[0]] - TL[2];
dst[x + 3] = L[2];
TL[2] = dst[x + 3 - p->linesize[0]];
}
dst += p->linesize[0];
}
p->pict_type = AV_PICTURE_TYPE_I;
p->key_frame = 1;
*got_frame = 1;
return avpkt->size;
}
static av_cold int decode_end(AVCodecContext *avctx)
{
YLCContext *s = avctx->priv_data;
for (int i = 0; i < FF_ARRAY_ELEMS(s->vlc); i++)
ff_free_vlc(&s->vlc[i]);
av_freep(&s->buffer);
s->buffer_size = 0;
return 0;
}
const FFCodec ff_ylc_decoder = {
.p.name = "ylc",
.p.long_name = NULL_IF_CONFIG_SMALL("YUY2 Lossless Codec"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_YLC,
.priv_data_size = sizeof(YLCContext),
.init = decode_init,
.close = decode_end,
FF_CODEC_DECODE_CB(decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
};
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