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/*
* ProRes RAW decoder
*
* Copyright (c) 2025 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
*/
#define COMP_ID (gl_LocalInvocationID.x)
GetBitContext gb;
#define DC_CB_MAX 12
const uint8_t dc_cb[DC_CB_MAX + 1] = {
U8(16), U8(33), U8(50), U8(51), U8(51), U8(51),
U8(68), U8(68), U8(68), U8(68), U8(68), U8(68), U8(118)
};
#define AC_CB_MAX 94
const int16_t ac_cb[AC_CB_MAX + 1] = {
I16( 0), I16(529), I16(273), I16(273), I16(546), I16(546),
I16(546), I16(290), I16(290), I16(290), I16(563), I16(563),
I16(563), I16(563), I16(563), I16(563), I16(563), I16(563),
I16(307), I16(307), I16(580), I16(580), I16(580), I16(580),
I16(580), I16(580), I16(580), I16(580), I16(580), I16(580),
I16(580), I16(580), I16(580), I16(580), I16(580), I16(580),
I16(580), I16(580), I16(580), I16(580), I16(580), I16(580),
I16(853), I16(853), I16(853), I16(853), I16(853), I16(853),
I16(853), I16(853), I16(853), I16(853), I16(853), I16(853),
I16(853), I16(853), I16(853), I16(853), I16(853), I16(853),
I16(853), I16(853), I16(853), I16(853), I16(853), I16(853),
I16(853), I16(853), I16(853), I16(853), I16(853), I16(853),
I16(853), I16(853), I16(853), I16(853), I16(853), I16(853),
I16(853), I16(853), I16(853), I16(853), I16(853), I16(853),
I16(853), I16(853), I16(853), I16(853), I16(853), I16(853),
I16(853), I16(853), I16(853), I16(853), I16(358)
};
#define RN_CB_MAX 27
const int16_t rn_cb[RN_CB_MAX + 1] = {
I16(512), I16(256), I16( 0), I16( 0), I16(529), I16(529), I16(273),
I16(273), I16( 17), I16( 17), I16( 33), I16( 33), I16(546), I16( 34),
I16( 34), I16( 34), I16( 34), I16( 34), I16( 34), I16( 34), I16( 34),
I16( 34), I16( 34), I16( 34), I16( 34), I16( 50), I16( 50), I16( 68),
};
#define LN_CB_MAX 14
const int16_t ln_cb[LN_CB_MAX + 1] = {
I16( 256), I16( 273), I16( 546), I16( 546), I16( 290), I16( 290), I16( 1075),
I16(1075), I16( 563), I16( 563), I16( 563), I16( 563), I16( 563), I16( 563),
I16( 51)
};
int16_t get_value(int16_t codebook)
{
const int16_t switch_bits = codebook >> 8;
const int16_t rice_order = codebook & I16(0xf);
const int16_t exp_order = (codebook >> 4) & I16(0xf);
uint32_t b = show_bits(gb, 32);
if (expectEXT(b == 0, false))
return I16(0);
int16_t q = I16(31) - I16(findMSB(b));
if ((b & 0x80000000) != 0) {
skip_bits(gb, 1 + rice_order);
return I16((b & 0x7FFFFFFF) >> (31 - rice_order));
}
if (q <= switch_bits) {
skip_bits(gb, q + rice_order + 1);
return I16((q << rice_order) +
(((b << (q + 1)) >> 1) >> (31 - rice_order)));
}
int16_t bits = exp_order + (q << 1) - switch_bits;
skip_bits(gb, bits);
return I16((b >> (32 - bits)) +
((switch_bits + 1) << rice_order) -
(1 << exp_order));
}
#define TODCCODEBOOK(x) ((x + 1) >> 1)
void store_val(ivec2 offs, int blk, int c, int16_t v)
{
imageStore(dst, offs + 2*ivec2(blk*8 + (c & 7), c >> 3),
ivec4(v & 0xFFFF));
}
void read_dc_vals(ivec2 offs, int nb_blocks)
{
int16_t dc, dc_add;
int16_t prev_dc = I16(0), sign = I16(0);
/* Special handling for first block */
dc = get_value(I16(700));
prev_dc = (dc >> 1) ^ -(dc & I16(1));
store_val(offs, 0, 0, prev_dc);
for (int n = 1; n < nb_blocks; n++) {
if (expectEXT(left_bits(gb) <= 0, false))
break;
uint8_t dc_codebook;
if ((n & 15) == 1)
dc_codebook = uint8_t(100);
else
dc_codebook = dc_cb[min(TODCCODEBOOK(dc), 13 - 1)];
dc = get_value(dc_codebook);
sign = sign ^ dc & int16_t(1);
dc_add = (-sign ^ I16(TODCCODEBOOK(dc))) + sign;
sign = I16(dc_add < 0);
prev_dc += dc_add;
store_val(offs, n, 0, prev_dc);
}
}
void read_ac_vals(ivec2 offs, int nb_blocks)
{
const int nb_codes = nb_blocks << 6;
const int log2_nb_blocks = findMSB(nb_blocks);
const int block_mask = (1 << log2_nb_blocks) - 1;
int16_t ac, rn, ln;
int16_t ac_codebook = I16(49);
int16_t rn_codebook = I16( 0);
int16_t ln_codebook = I16(66);
int16_t sign;
int16_t val;
for (int n = nb_blocks; n <= nb_codes;) {
if (expectEXT(left_bits(gb) <= 0, false))
break;
ln = get_value(ln_codebook);
for (int i = 0; i < ln; i++) {
if (expectEXT(left_bits(gb) <= 0, false))
break;
if (expectEXT(n >= nb_codes, false))
break;
ac = get_value(ac_codebook);
ac_codebook = ac_cb[min(ac, 95 - 1)];
sign = -int16_t(get_bit(gb));
val = ((ac + I16(1)) ^ sign) - sign;
store_val(offs, n & block_mask, n >> log2_nb_blocks, val);
n++;
}
if (expectEXT(n >= nb_codes, false))
break;
rn = get_value(rn_codebook);
rn_codebook = rn_cb[min(rn, 28 - 1)];
n += rn + 1;
if (expectEXT(n >= nb_codes, false))
break;
if (expectEXT(left_bits(gb) <= 0, false))
break;
ac = get_value(ac_codebook);
sign = -int16_t(get_bit(gb));
val = ((ac + I16(1)) ^ sign) - sign;
store_val(offs, n & block_mask, n >> log2_nb_blocks, val);
ac_codebook = ac_cb[min(ac, 95 - 1)];
ln_codebook = ln_cb[min(ac, 15 - 1)];
n++;
}
}
void main(void)
{
const uint tile_idx = gl_WorkGroupID.y*gl_NumWorkGroups.x + gl_WorkGroupID.x;
TileData td = tile_data[tile_idx];
if (expectEXT(td.pos.x >= frame_size.x, false))
return;
uint64_t pkt_offset = uint64_t(pkt_data) + td.offset;
u8vec2buf hdr_data = u8vec2buf(pkt_offset);
int header_len = hdr_data[0].v.x >> 3;
ivec4 size = ivec4(td.size,
pack16(hdr_data[2].v.yx),
pack16(hdr_data[1].v.yx),
pack16(hdr_data[3].v.yx));
size[0] = size[0] - size[1] - size[2] - size[3] - header_len;
if (expectEXT(size[0] < 0, false))
return;
const ivec2 offs = td.pos + ivec2(COMP_ID & 1, COMP_ID >> 1);
const int w = min(tile_size.x, frame_size.x - td.pos.x) / 2;
const int nb_blocks = w / 8;
const ivec4 comp_offset = ivec4(size[2] + size[1] + size[3],
size[2],
0,
size[2] + size[1]);
init_get_bits(gb, u8buf(pkt_offset + header_len + comp_offset[COMP_ID]),
size[COMP_ID]);
read_dc_vals(offs, nb_blocks);
read_ac_vals(offs, nb_blocks);
}
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