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FFmpeg/libavcodec/ylc.c
Andreas Rheinhardt 20f9727018 avcodec/codec_internal: Add FFCodec, hide internal part of AVCodec 
Up until now, codec.h contains both public and private parts
of AVCodec. This exposes the internals of AVCodec to users
and leads them into the temptation of actually using them
and forces us to forward-declare structures and types that
users can't use at all.

This commit changes this by adding a new structure FFCodec to
codec_internal.h that extends AVCodec, i.e. contains the public
AVCodec as first member; the private fields of AVCodec are moved
to this structure, leaving codec.h clean.

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-03-21 01:33:09 +01:00

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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,
void *data, 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;
AVFrame * const p = data;
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,
.decode = decode_frame,
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
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