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127 lines
3.8 KiB
Plaintext
127 lines
3.8 KiB
Plaintext
/*
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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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uint8_t state[CONTEXT_SIZE];
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void init_slice(inout SliceContext sc, const uint slice_idx)
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{
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/* Set coordinates */
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uvec2 img_size = imageSize(src[0]);
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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 == 1);
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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 == 0) || (sc.slice_coding_mode == 1))
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sc.slice_rct_coef = ivec2(1, 1);
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rac_init(sc.c,
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OFFBUF(u8buf, out_data, slice_idx * slice_size_max),
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slice_size_max);
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}
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void put_usymbol(inout RangeCoder c, uint v)
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{
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bool is_nil = (v == 0);
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put_rac_direct(c, 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_direct(c, state[1 + min(i, 9)], true);
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put_rac_direct(c, state[1 + min(e, 9)], false);
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for (int i = e - 1; i >= 0; i--)
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put_rac_direct(c, state[22 + min(i, 9)], bool(bitfieldExtract(v, i, 1)));
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}
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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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state[i] = uint8_t(128);
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put_usymbol(sc.c, gl_WorkGroupID.x);
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put_usymbol(sc.c, gl_WorkGroupID.y);
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put_usymbol(sc.c, 0);
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put_usymbol(sc.c, 0);
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for (int i = 0; i < codec_planes; i++)
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put_usymbol(sc.c, sc.quant_table_idx[i]);
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put_usymbol(sc.c, pic_mode);
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put_usymbol(sc.c, sar.x);
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put_usymbol(sc.c, sar.y);
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if (version >= 4) {
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put_rac_direct(sc.c, state[0], sc.slice_reset_contexts);
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put_usymbol(sc.c, sc.slice_coding_mode);
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if (sc.slice_coding_mode != 1 && colorspace == 1) {
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put_usymbol(sc.c, sc.slice_rct_coef.y);
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put_usymbol(sc.c, sc.slice_rct_coef.x);
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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(sc.c, bool(key_frame));
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}
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#ifdef GOLOMB
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void init_golomb(inout SliceContext sc)
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{
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sc.hdr_len = rac_terminate(sc.c);
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init_put_bits(sc.pb,
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OFFBUF(u8buf, sc.c.bytestream_start, sc.hdr_len),
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slice_size_max - sc.hdr_len);
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}
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#endif
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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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#ifdef GOLOMB
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init_golomb(slice_ctx[slice_idx]);
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#endif
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}
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