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/*
* FFv1 codec
*
* Copyright (c) 2024 Lynne <dev@lynne.ee>
*
* 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
*/
struct SliceContext {
RangeCoder c;
#if !defined(DECODE)
PutBitContext pb; /* 8*8 bytes */
#else
GetBitContext gb;
#endif
ivec2 slice_dim;
ivec2 slice_pos;
ivec2 slice_rct_coef;
u8vec3 quant_table_idx;
uint hdr_len; // only used for golomb
uint slice_coding_mode;
bool slice_reset_contexts;
};
/* -1, { -1, 0 } */
int predict(int L, ivec2 top)
{
return mid_pred(L, L + top[1] - top[0], top[1]);
}
/* { -2, -1 }, { -1, 0, 1 }, 0 */
int get_context(VTYPE2 cur_l, VTYPE3 top_l, TYPE top2, uint8_t quant_table_idx)
{
const int LT = top_l[0]; /* -1 */
const int T = top_l[1]; /* 0 */
const int RT = top_l[2]; /* 1 */
const int L = cur_l[1]; /* -1 */
int base = quant_table[quant_table_idx][0][(L - LT) & MAX_QUANT_TABLE_MASK] +
quant_table[quant_table_idx][1][(LT - T) & MAX_QUANT_TABLE_MASK] +
quant_table[quant_table_idx][2][(T - RT) & MAX_QUANT_TABLE_MASK];
if ((quant_table[quant_table_idx][3][127] == 0) &&
(quant_table[quant_table_idx][4][127] == 0))
return base;
const int TT = top2; /* -2 */
const int LL = cur_l[0]; /* -2 */
return base +
quant_table[quant_table_idx][3][(LL - L) & MAX_QUANT_TABLE_MASK] +
quant_table[quant_table_idx][4][(TT - T) & MAX_QUANT_TABLE_MASK];
}
const uint32_t log2_run[41] = {
0, 0, 0, 0, 1, 1, 1, 1,
2, 2, 2, 2, 3, 3, 3, 3,
4, 4, 5, 5, 6, 6, 7, 7,
8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23,
24,
};
uint slice_coord(uint width, uint sx, uint num_h_slices, uint chroma_shift)
{
uint mpw = 1 << chroma_shift;
uint awidth = align(width, mpw);
if ((version < 4) || ((version == 4) && (micro_version < 3)))
return width * sx / num_h_slices;
sx = (2 * awidth * sx + num_h_slices * mpw) / (2 * num_h_slices * mpw) * mpw;
if (sx == awidth)
sx = width;
return sx;
}
#ifdef RGB
#define RGB_LBUF (RGB_LINECACHE - 1)
#define LADDR(p) (ivec2((p).x, ((p).y & RGB_LBUF)))
ivec2 get_pred(readonly uimage2D pred, ivec2 sp, ivec2 off,
int comp, int sw, uint8_t quant_table_idx, bool extend_lookup)
{
const ivec2 yoff_border1 = expectEXT(off.x == 0, false) ? off + ivec2(1, -1) : off;
/* Thanks to the same coincidence as below, we can skip checking if off == 0, 1 */
VTYPE3 top = VTYPE3(TYPE(imageLoad(pred, sp + LADDR(yoff_border1 + ivec2(-1, -1)))[comp]),
TYPE(imageLoad(pred, sp + LADDR(off + ivec2(0, -1)))[comp]),
TYPE(imageLoad(pred, sp + LADDR(off + ivec2(min(1, sw - off.x - 1), -1)))[comp]));
/* Normally, we'd need to check if off != ivec2(0, 0) here, since otherwise, we must
* return zero. However, ivec2(-1, 0) + ivec2(1, -1) == ivec2(0, -1), e.g. previous
* row, 0 offset, same slice, which is zero since we zero out the buffer for RGB */
TYPE cur = TYPE(imageLoad(pred, sp + LADDR(yoff_border1 + ivec2(-1, 0)))[comp]);
int base = quant_table[quant_table_idx][0][(cur - top[0]) & MAX_QUANT_TABLE_MASK] +
quant_table[quant_table_idx][1][(top[0] - top[1]) & MAX_QUANT_TABLE_MASK] +
quant_table[quant_table_idx][2][(top[1] - top[2]) & MAX_QUANT_TABLE_MASK];
if (expectEXT(extend_lookup, false)) {
TYPE cur2 = TYPE(0);
if (expectEXT(off.x > 0, true)) {
const ivec2 yoff_border2 = expectEXT(off.x == 1, false) ? ivec2(-1, -1) : ivec2(-2, 0);
cur2 = TYPE(imageLoad(pred, sp + LADDR(off + yoff_border2))[comp]);
}
base += quant_table[quant_table_idx][3][(cur2 - cur) & MAX_QUANT_TABLE_MASK];
/* top-2 became current upon swap */
TYPE top2 = TYPE(imageLoad(pred, sp + LADDR(off))[comp]);
base += quant_table[quant_table_idx][4][(top2 - top[1]) & MAX_QUANT_TABLE_MASK];
}
/* context, prediction */
return ivec2(base, predict(cur, VTYPE2(top)));
}
#else /* RGB */
#define LADDR(p) (p)
ivec2 get_pred(readonly uimage2D pred, ivec2 sp, ivec2 off,
int comp, int sw, uint8_t quant_table_idx, bool extend_lookup)
{
const ivec2 yoff_border1 = off.x == 0 ? ivec2(1, -1) : ivec2(0, 0);
sp += off;
VTYPE3 top = VTYPE3(TYPE(0),
TYPE(0),
TYPE(0));
if (off.y > 0 && off != ivec2(0, 1))
top[0] = TYPE(imageLoad(pred, sp + ivec2(-1, -1) + yoff_border1)[comp]);
if (off.y > 0) {
top[1] = TYPE(imageLoad(pred, sp + ivec2(0, -1))[comp]);
top[2] = TYPE(imageLoad(pred, sp + ivec2(min(1, sw - off.x - 1), -1))[comp]);
}
TYPE cur = TYPE(0);
if (off != ivec2(0, 0))
cur = TYPE(imageLoad(pred, sp + ivec2(-1, 0) + yoff_border1)[comp]);
int base = quant_table[quant_table_idx][0][(cur - top[0]) & MAX_QUANT_TABLE_MASK] +
quant_table[quant_table_idx][1][(top[0] - top[1]) & MAX_QUANT_TABLE_MASK] +
quant_table[quant_table_idx][2][(top[1] - top[2]) & MAX_QUANT_TABLE_MASK];
if (expectEXT(extend_lookup, false)) {
TYPE cur2 = TYPE(0);
if (off.x > 0 && off != ivec2(1, 0)) {
const ivec2 yoff_border2 = off.x == 1 ? ivec2(1, -1) : ivec2(0, 0);
cur2 = TYPE(imageLoad(pred, sp + ivec2(-2, 0) + yoff_border2)[comp]);
}
base += quant_table[quant_table_idx][3][(cur2 - cur) & MAX_QUANT_TABLE_MASK];
TYPE top2 = TYPE(0);
if (off.y > 1)
top2 = TYPE(imageLoad(pred, sp + ivec2(0, -2))[comp]);
base += quant_table[quant_table_idx][4][(top2 - top[1]) & MAX_QUANT_TABLE_MASK];
}
/* context, prediction */
return ivec2(base, predict(cur, VTYPE2(top)));
}
#endif
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