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123 lines
3.5 KiB
GLSL
123 lines
3.5 KiB
GLSL
/*
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* FFv1 codec
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*
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* Copyright (c) 2024 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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#pragma shader_stage(compute)
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#extension GL_GOOGLE_include_directive : require
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#define FULL_RENORM
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#include "common.glsl"
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#include "ffv1_common.glsl"
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void init_slice(inout SliceContext sc, uint slice_idx)
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{
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/* Set coordinates */
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uint sxs = slice_coord(img_size.x, gl_WorkGroupID.x + 0,
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gl_NumWorkGroups.x, chroma_shift.x);
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uint sxe = slice_coord(img_size.x, gl_WorkGroupID.x + 1,
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gl_NumWorkGroups.x, chroma_shift.x);
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uint sys = slice_coord(img_size.y, gl_WorkGroupID.y + 0,
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gl_NumWorkGroups.y, chroma_shift.y);
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uint sye = slice_coord(img_size.y, gl_WorkGroupID.y + 1,
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gl_NumWorkGroups.y, chroma_shift.y);
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sc.slice_pos = ivec2(sxs, sys);
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sc.slice_dim = ivec2(sxe - sxs, sye - sys);
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sc.slice_coding_mode = int(force_pcm);
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sc.slice_reset_contexts = sc.slice_coding_mode == 1;
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sc.quant_table_idx = u8vec3(context_model);
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if (!rct_search || force_pcm)
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sc.slice_rct_coef = ivec2(1, 1);
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rac_init(slice_idx*slice_size_max, slice_size_max);
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}
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void put_usymbol(uint v)
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{
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bool is_nil = (v == 0);
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put_rac(rc_state[0], is_nil);
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if (is_nil)
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return;
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const int e = findMSB(v);
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for (int i = 0; i <= e; i++)
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put_rac(rc_state[1 + min(i, 9)], i < e);
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for (int i = e - 1; i >= 0; i--)
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put_rac(rc_state[22 + min(i, 9)], bool(bitfieldExtract(v, i, 1)));
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}
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shared uint hdr_sym[4 + 4 + 3];
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const int nb_hdr_sym = 4 + codec_planes + 3;
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void write_slice_header(inout SliceContext sc)
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{
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[[unroll]]
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for (int i = 0; i < CONTEXT_SIZE; i++)
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rc_state[i] = uint8_t(128);
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hdr_sym[0] = gl_WorkGroupID.x;
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hdr_sym[1] = gl_WorkGroupID.y;
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hdr_sym[2] = 0;
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hdr_sym[3] = 0;
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[[unroll]]
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for (int i = 0; i < codec_planes; i++)
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hdr_sym[4 + i] = context_model;
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hdr_sym[nb_hdr_sym - 3] = pic_mode;
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hdr_sym[nb_hdr_sym - 2] = sar.x;
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hdr_sym[nb_hdr_sym - 1] = sar.y;
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for (int i = 0; i < nb_hdr_sym; i++)
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put_usymbol(hdr_sym[i]);
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if (version >= 4) {
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put_rac(rc_state[0], force_pcm);
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put_usymbol(uint(force_pcm));
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if (!force_pcm && colorspace == 1) {
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put_usymbol(sc.slice_rct_coef.g);
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put_usymbol(sc.slice_rct_coef.r);
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}
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}
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}
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void write_frame_header(inout SliceContext sc)
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{
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put_rac_equi(bool(key_frame));
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}
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void main(void)
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{
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const uint slice_idx = gl_WorkGroupID.y*gl_NumWorkGroups.x + gl_WorkGroupID.x;
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init_slice(slice_ctx[slice_idx], slice_idx);
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if (slice_idx == 0)
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write_frame_header(slice_ctx[slice_idx]);
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write_slice_header(slice_ctx[slice_idx]);
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slice_ctx[slice_idx].c = rc;
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}
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