mirror of
https://git.ffmpeg.org/ffmpeg.git
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7af5b5cec3
It allows us to easily synchronize the software and hardware decoders, by removing the abstraction the Vulkan layer added by changing the values written.
235 lines
7.3 KiB
Plaintext
235 lines
7.3 KiB
Plaintext
/*
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* ProRes RAW decoder
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*
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* Copyright (c) 2025 Lynne <dev@lynne.ee>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#define U8(x) (uint8_t(x))
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#define I16(x) (int16_t(x))
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#define COMP_ID (gl_LocalInvocationID.x)
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GetBitContext gb;
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#define DC_CB_MAX 12
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const uint8_t dc_cb[DC_CB_MAX + 1] = {
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U8(16), U8(33), U8(50), U8(51), U8(51), U8(51),
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U8(68), U8(68), U8(68), U8(68), U8(68), U8(68), U8(118)
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};
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#define AC_CB_MAX 94
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const int16_t ac_cb[AC_CB_MAX + 1] = {
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I16( 0), I16(529), I16(273), I16(273), I16(546), I16(546),
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I16(546), I16(290), I16(290), I16(290), I16(563), I16(563),
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I16(563), I16(563), I16(563), I16(563), I16(563), I16(563),
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I16(307), I16(307), I16(580), I16(580), I16(580), I16(580),
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I16(580), I16(580), I16(580), I16(580), I16(580), I16(580),
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I16(580), I16(580), I16(580), I16(580), I16(580), I16(580),
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I16(580), I16(580), I16(580), I16(580), I16(580), I16(580),
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I16(853), I16(853), I16(853), I16(853), I16(853), I16(853),
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I16(853), I16(853), I16(853), I16(853), I16(853), I16(853),
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I16(853), I16(853), I16(853), I16(853), I16(853), I16(853),
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I16(853), I16(853), I16(853), I16(853), I16(853), I16(853),
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I16(853), I16(853), I16(853), I16(853), I16(853), I16(853),
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I16(853), I16(853), I16(853), I16(853), I16(853), I16(853),
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I16(853), I16(853), I16(853), I16(853), I16(853), I16(853),
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I16(853), I16(853), I16(853), I16(853), I16(853), I16(853),
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I16(853), I16(853), I16(853), I16(853), I16(358)
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};
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#define RN_CB_MAX 27
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const int16_t rn_cb[RN_CB_MAX + 1] = {
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I16(512), I16(256), I16( 0), I16( 0), I16(529), I16(529), I16(273),
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I16(273), I16( 17), I16( 17), I16( 33), I16( 33), I16(546), I16( 34),
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I16( 34), I16( 34), I16( 34), I16( 34), I16( 34), I16( 34), I16( 34),
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I16( 34), I16( 34), I16( 34), I16( 34), I16( 50), I16( 50), I16( 68),
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};
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#define LN_CB_MAX 14
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const int16_t ln_cb[LN_CB_MAX + 1] = {
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I16( 256), I16( 273), I16( 546), I16( 546), I16( 290), I16( 290), I16( 1075),
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I16(1075), I16( 563), I16( 563), I16( 563), I16( 563), I16( 563), I16( 563),
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I16( 51)
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};
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int16_t get_value(int16_t codebook)
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{
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const int16_t switch_bits = codebook >> 8;
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const int16_t rice_order = codebook & I16(0xf);
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const int16_t exp_order = (codebook >> 4) & I16(0xf);
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uint32_t b = show_bits(gb, 32);
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if (expectEXT(b == 0, false))
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return I16(0);
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int16_t q = I16(31) - I16(findMSB(b));
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if ((b & 0x80000000) != 0) {
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skip_bits(gb, 1 + rice_order);
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return I16((b & 0x7FFFFFFF) >> (31 - rice_order));
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}
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if (q <= switch_bits) {
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skip_bits(gb, q + rice_order + 1);
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return I16((q << rice_order) +
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(((b << (q + 1)) >> 1) >> (31 - rice_order)));
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}
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int16_t bits = exp_order + (q << 1) - switch_bits;
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skip_bits(gb, bits);
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return I16((b >> (32 - bits)) +
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((switch_bits + 1) << rice_order) -
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(1 << exp_order));
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}
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#define TODCCODEBOOK(x) ((x + 1) >> 1)
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void store_val(ivec2 offs, int blk, int c, int16_t v)
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{
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imageStore(dst, offs + 2*ivec2(blk*8 + (c & 7), c >> 3),
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ivec4(v & 0xFFFF));
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}
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void read_dc_vals(ivec2 offs, int nb_blocks)
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{
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int16_t dc, dc_add;
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int16_t prev_dc = I16(0), sign = I16(0);
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/* Special handling for first block */
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dc = get_value(I16(700));
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prev_dc = (dc >> 1) ^ -(dc & I16(1));
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store_val(offs, 0, 0, prev_dc);
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for (int n = 1; n < nb_blocks; n++) {
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if (expectEXT(left_bits(gb) <= 0, false))
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break;
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uint8_t dc_codebook;
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if ((n & 15) == 1)
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dc_codebook = uint8_t(100);
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else
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dc_codebook = dc_cb[min(TODCCODEBOOK(dc), 13 - 1)];
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dc = get_value(dc_codebook);
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sign = sign ^ dc & int16_t(1);
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dc_add = (-sign ^ I16(TODCCODEBOOK(dc))) + sign;
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sign = I16(dc_add < 0);
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prev_dc += dc_add;
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store_val(offs, n, 0, prev_dc);
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}
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}
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void read_ac_vals(ivec2 offs, int nb_blocks)
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{
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const int nb_codes = nb_blocks << 6;
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const int log2_nb_blocks = findMSB(nb_blocks);
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const int block_mask = (1 << log2_nb_blocks) - 1;
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int16_t ac, rn, ln;
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int16_t ac_codebook = I16(49);
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int16_t rn_codebook = I16( 0);
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int16_t ln_codebook = I16(66);
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int16_t sign;
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int16_t val;
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for (int n = nb_blocks; n <= nb_codes;) {
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if (expectEXT(left_bits(gb) <= 0, false))
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break;
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ln = get_value(ln_codebook);
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for (int i = 0; i < ln; i++) {
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if (expectEXT(left_bits(gb) <= 0, false))
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break;
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if (expectEXT(n >= nb_codes, false))
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break;
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ac = get_value(ac_codebook);
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ac_codebook = ac_cb[min(ac, 95 - 1)];
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sign = -int16_t(get_bit(gb));
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val = ((ac + I16(1)) ^ sign) - sign;
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store_val(offs, n & block_mask, n >> log2_nb_blocks, val);
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n++;
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}
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if (expectEXT(n >= nb_codes, false))
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break;
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rn = get_value(rn_codebook);
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rn_codebook = rn_cb[min(rn, 28 - 1)];
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n += rn + 1;
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if (expectEXT(n >= nb_codes, false))
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break;
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if (expectEXT(left_bits(gb) <= 0, false))
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break;
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ac = get_value(ac_codebook);
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sign = -int16_t(get_bit(gb));
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val = ((ac + I16(1)) ^ sign) - sign;
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store_val(offs, n & block_mask, n >> log2_nb_blocks, val);
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ac_codebook = ac_cb[min(ac, 95 - 1)];
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ln_codebook = ln_cb[min(ac, 15 - 1)];
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n++;
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}
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}
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void main(void)
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{
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const uint tile_idx = gl_WorkGroupID.y*gl_NumWorkGroups.x + gl_WorkGroupID.x;
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TileData td = tile_data[tile_idx];
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if (expectEXT(td.pos.x >= frame_size.x, false))
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return;
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uint64_t pkt_offset = uint64_t(pkt_data) + td.offset;
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u8vec2buf hdr_data = u8vec2buf(pkt_offset);
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int header_len = hdr_data[0].v.x >> 3;
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ivec4 size = ivec4(td.size,
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pack16(hdr_data[2].v.yx),
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pack16(hdr_data[1].v.yx),
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pack16(hdr_data[3].v.yx));
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size[0] = size[0] - size[1] - size[2] - size[3] - header_len;
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if (expectEXT(size[0] < 0, false))
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return;
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const ivec2 offs = td.pos + ivec2(COMP_ID & 1, COMP_ID >> 1);
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const int w = min(tile_size.x, frame_size.x - td.pos.x) / 2;
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const int nb_blocks = w / 8;
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const ivec4 comp_offset = ivec4(size[2] + size[1] + size[3],
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size[2],
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0,
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size[2] + size[1]);
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init_get_bits(gb, u8buf(pkt_offset + header_len + comp_offset[COMP_ID]),
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size[COMP_ID]);
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read_dc_vals(offs, nb_blocks);
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read_ac_vals(offs, nb_blocks);
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}
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