mirror of
https://github.com/FFmpeg/FFmpeg.git
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95 lines
3.6 KiB
Plaintext
95 lines
3.6 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 COMP_ID (gl_LocalInvocationID.z)
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#define BLOCK_ID (gl_LocalInvocationID.y)
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#define ROW_ID (gl_LocalInvocationID.x)
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const u8vec2 scan[64] = {
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u8vec2( 0, 0), u8vec2( 4, 0), u8vec2( 0, 2), u8vec2( 4, 2),
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u8vec2( 0, 8), u8vec2( 4, 8), u8vec2( 6, 8), u8vec2( 2, 10),
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u8vec2( 2, 0), u8vec2( 6, 0), u8vec2( 2, 2), u8vec2( 6, 2),
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u8vec2( 2, 8), u8vec2( 8, 8), u8vec2( 0, 10), u8vec2( 4, 10),
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u8vec2( 8, 0), u8vec2(12, 0), u8vec2( 8, 2), u8vec2(12, 2),
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u8vec2(10, 8), u8vec2(14, 8), u8vec2( 6, 10), u8vec2( 2, 12),
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u8vec2(10, 0), u8vec2(14, 0), u8vec2(10, 2), u8vec2(14, 2),
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u8vec2(12, 8), u8vec2( 8, 10), u8vec2( 0, 12), u8vec2( 4, 12),
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u8vec2( 0, 4), u8vec2( 4, 4), u8vec2( 6, 4), u8vec2( 2, 6),
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u8vec2(10, 10), u8vec2(14, 10), u8vec2( 6, 12), u8vec2( 2, 14),
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u8vec2( 2, 4), u8vec2( 8, 4), u8vec2( 0, 6), u8vec2( 4, 6),
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u8vec2(12, 10), u8vec2( 8, 12), u8vec2( 0, 14), u8vec2( 4, 14),
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u8vec2(10, 4), u8vec2(14, 4), u8vec2( 6, 6), u8vec2(12, 6),
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u8vec2(10, 12), u8vec2(14, 12), u8vec2( 6, 14), u8vec2(12, 14),
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u8vec2(12, 4), u8vec2( 8, 6), u8vec2(10, 6), u8vec2(14, 6),
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u8vec2(12, 12), u8vec2( 8, 14), u8vec2(10, 14), u8vec2(14, 14),
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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 qscale = pack16(hdr_data[0].v.yx);
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const ivec2 offs = td.pos + ivec2(COMP_ID & 1, COMP_ID >> 1);
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const uint w = min(tile_size.x, frame_size.x - td.pos.x) / 2;
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const uint nb_blocks = w / 8;
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/* We have to do non-uniform access, so copy it */
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uint8_t qmat_buf[64] = qmat;
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[[unroll]]
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for (uint y = 0; y < 8; y++) {
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uint block_off = y*8 + ROW_ID;
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int v = int(imageLoad(dst, offs + 2*ivec2(BLOCK_ID*8, 0) + scan[block_off])[0]);
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float vf = float(sign_extend(v, 16)) / 32768.0;
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vf *= qmat_buf[block_off] * qscale;
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blocks[BLOCK_ID][COMP_ID*72 + y*9 + ROW_ID] = (vf / (64*4.56)) *
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idct_scale[block_off];
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}
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/* Column-wise iDCT */
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idct8(BLOCK_ID, COMP_ID*72 + ROW_ID, 9);
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barrier();
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blocks[BLOCK_ID][COMP_ID*72 + ROW_ID * 9] += 0.5f;
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/* Row-wise iDCT */
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idct8(BLOCK_ID, COMP_ID*72 + ROW_ID * 9, 1);
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barrier();
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[[unroll]]
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for (uint y = 0; y < 8; y++) {
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int v = int(round(blocks[BLOCK_ID][COMP_ID*72 + y*9 + ROW_ID]*4095.0));
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v = clamp(v, 0, 4095);
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v <<= 4;
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imageStore(dst,
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offs + 2*ivec2(BLOCK_ID*8 + ROW_ID, y),
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ivec4(v));
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}
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}
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