mirror of https://git.ffmpeg.org/ffmpeg.git
102 lines
3.2 KiB
Plaintext
102 lines
3.2 KiB
Plaintext
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/*
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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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ivec2 get_diff(ivec2 pos, ivec2 off, int p, int comp, int sw, int bits)
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{
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const ivec2 yoff_border1 = off.x == 0 ? ivec2(1, -1) : ivec2(0, 0);
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const ivec2 yoff_border2 = off.x == 1 ? ivec2(1, -1) : ivec2(0, 0);
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TYPE top2 = TYPE(0);
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if (off.y > 1)
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top2 = TYPE(imageLoad(src[p], pos + ivec2(0, -2))[comp]);
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VTYPE3 top = VTYPE3(TYPE(0),
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TYPE(0),
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TYPE(0));
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if (off.y > 0 && off != ivec2(0, 1))
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top[0] = TYPE(imageLoad(src[p], pos + ivec2(-1, -1) + yoff_border1)[comp]);
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if (off.y > 0) {
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top[1] = TYPE(imageLoad(src[p], pos + ivec2(0, -1))[comp]);
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top[2] = TYPE(imageLoad(src[p], pos + ivec2(min(1, sw - off.x - 1), -1))[comp]);
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}
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VTYPE3 cur = VTYPE3(TYPE(0),
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TYPE(0),
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imageLoad(src[p], pos)[comp]);
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if (off.x > 0 && off != ivec2(1, 0))
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cur[0] = TYPE(imageLoad(src[p], pos + ivec2(-2, 0) + yoff_border2)[comp]);
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if (off != ivec2(0, 0))
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cur[1] = TYPE(imageLoad(src[p], pos + ivec2(-1, 0) + yoff_border1)[comp]);
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/* context, diff */
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ivec2 d = ivec2(get_context(VTYPE2(cur), top, top2, context_model),
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cur[2] - predict(cur[1], VTYPE2(top)));
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if (d[0] < 0)
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d = -d;
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d[1] = fold(d[1], bits);
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return d;
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}
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void finalize_slice(inout SliceContext sc, const uint slice_idx)
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{
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#ifdef GOLOMB
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uint32_t enc_len = sc.hdr_len + flush_put_bits(sc.pb);
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#else
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uint32_t enc_len = rac_terminate(sc.c);
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#endif
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u8buf bs = u8buf(sc.c.bytestream_start);
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/* Append slice length */
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u8vec4 enc_len_p = unpack8(enc_len);
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bs[enc_len + 0].v = enc_len_p.z;
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bs[enc_len + 1].v = enc_len_p.y;
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bs[enc_len + 2].v = enc_len_p.x;
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enc_len += 3;
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/* Calculate and write CRC */
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if (ec != 0) {
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bs[enc_len].v = uint8_t(0);
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enc_len++;
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uint32_t crc = crcref;
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for (int i = 0; i < enc_len; i++)
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crc = crc_ieee[(crc & 0xFF) ^ uint32_t(bs[i].v)] ^ (crc >> 8);
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if (crcref != 0x00000000)
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crc ^= 0x8CD88196;
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u8vec4 crc_p = unpack8(crc);
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bs[enc_len + 0].v = crc_p.x;
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bs[enc_len + 1].v = crc_p.y;
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bs[enc_len + 2].v = crc_p.z;
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bs[enc_len + 3].v = crc_p.w;
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enc_len += 4;
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}
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slice_results[slice_idx*2 + 0] = enc_len;
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slice_results[slice_idx*2 + 1] = uint32_t(uint64_t(bs) - uint64_t(out_data));
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}
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