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ffv1enc_vulkan: merge all encoder variants into one file

Makes it easier to work with, despite the heavy ifdeffery.

Lynne committed 1 year ago

Commit ebbc7ff1 parent fd18ae87 files · +244 −400Browse files

Showing the changes to libavcodec/vulkan (6 of 7 files). Show all

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6 files
  1. libavcodec/vulkan/Makefile +1 −3
  2. libavcodec/vulkan/ffv1_enc.comp +239 −1
  3. libavcodec/vulkan/ffv1_enc_ac.comp +0 −83
  4. libavcodec/vulkan/ffv1_enc_common.comp +0 −101
  5. libavcodec/vulkan/ffv1_enc_rgb.comp +0 −83
  6. libavcodec/vulkan/ffv1_enc_vlc.comp +0 −112
libavcodec/vulkan/Makefile+1−3
@@ -6,10 +6,8 @@ clean:: · 5 unmodified lines
66 OBJS-$(CONFIG_FFV1_VULKAN_ENCODER) += vulkan/common.o \
77 vulkan/rangecoder.o vulkan/ffv1_vlc.o \
88 vulkan/ffv1_common.o vulkan/ffv1_reset.o \
9− vulkan/ffv1_enc_common.o \
109 vulkan/ffv1_enc_rct.o vulkan/ffv1_enc_setup.o \
11− vulkan/ffv1_enc_vlc.o vulkan/ffv1_enc_ac.o \
12− vulkan/ffv1_enc.o vulkan/ffv1_enc_rgb.o
10+ vulkan/ffv1_enc.o
1311
1412 OBJS-$(CONFIG_FFV1_VULKAN_HWACCEL) += vulkan/common.o \
1513 vulkan/rangecoder.o vulkan/ffv1_vlc.o \
libavcodec/vulkan/ffv1_enc.comp+239−1
@@ -20,12 +20,186 @@ · 19 unmodified lines
2020 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
2121 */
2222
23+ivec2 get_diff(ivec2 pos, ivec2 off, int p, int comp, int sw, int bits)
24+{
25+ const ivec2 yoff_border1 = off.x == 0 ? ivec2(1, -1) : ivec2(0, 0);
26+ const ivec2 yoff_border2 = off.x == 1 ? ivec2(1, -1) : ivec2(0, 0);
27+
28+ TYPE top2 = TYPE(0);
29+ if (off.y > 1)
30+ top2 = TYPE(imageLoad(src[p], pos + ivec2(0, -2))[comp]);
31+
32+ VTYPE3 top = VTYPE3(TYPE(0),
33+ TYPE(0),
34+ TYPE(0));
35+ if (off.y > 0 && off != ivec2(0, 1))
36+ top[0] = TYPE(imageLoad(src[p], pos + ivec2(-1, -1) + yoff_border1)[comp]);
37+ if (off.y > 0) {
38+ top[1] = TYPE(imageLoad(src[p], pos + ivec2(0, -1))[comp]);
39+ top[2] = TYPE(imageLoad(src[p], pos + ivec2(min(1, sw - off.x - 1), -1))[comp]);
40+ }
41+
42+ VTYPE3 cur = VTYPE3(TYPE(0),
43+ TYPE(0),
44+ imageLoad(src[p], pos)[comp]);
45+ if (off.x > 0 && off != ivec2(1, 0))
46+ cur[0] = TYPE(imageLoad(src[p], pos + ivec2(-2, 0) + yoff_border2)[comp]);
47+ if (off != ivec2(0, 0))
48+ cur[1] = TYPE(imageLoad(src[p], pos + ivec2(-1, 0) + yoff_border1)[comp]);
49+
50+ /* context, diff */
51+ ivec2 d = ivec2(get_context(VTYPE2(cur), top, top2, context_model),
52+ cur[2] - predict(cur[1], VTYPE2(top)));
53+
54+ if (d[0] < 0)
55+ d = -d;
56+
57+ d[1] = fold(d[1], bits);
58+
59+ return d;
60+}
61+
62+#ifndef GOLOMB
63+void put_rac(inout RangeCoder c, uint64_t state, bool bit)
64+{
65+ put_rac_norenorm(c, state, bit);
66+ if (c.range < 0x100)
67+ renorm_encoder(c);
68+}
69+
70+/* Note - only handles signed values */
71+void put_symbol(inout RangeCoder c, uint64_t state, int v)
72+{
73+ bool is_nil = (v == 0);
74+ put_rac(c, state, is_nil);
75+ if (is_nil)
76+ return;
77+
78+ const int a = abs(v);
79+ const int e = findMSB(a);
80+
81+ state += 1;
82+ for (int i = 0; i < e; i++)
83+ put_rac(c, state + min(i, 9), true);
84+ put_rac(c, state + min(e, 9), false);
85+
86+ state += 21;
87+ for (int i = e - 1; i >= 0; i--)
88+ put_rac(c, state + min(i, 9), bool(bitfieldExtract(a, i, 1)));
89+
90+ put_rac(c, state - 11 + min(e, 10), v < 0);
91+}
92+
93+void encode_line_pcm(inout SliceContext sc, int y, int p, int comp,
94+ int bits)
95+{
96+ ivec2 sp = sc.slice_pos;
97+ int w = sc.slice_dim.x;
98+ if (p > 0 && p < 3) {
99+ w >>= chroma_shift.x;
100+ sp >>= chroma_shift;
101+ }
102+
103+ for (int x = 0; x < w; x++) {
104+ uint v = imageLoad(src[p], (sp + ivec2(x, y)))[comp];
105+ for (int i = (bits - 1); i >= 0; i--)
106+ put_rac_equi(sc.c, bool(bitfieldExtract(v, i, 1)));
107+ }
108+}
109+
110+void encode_line(inout SliceContext sc, uint64_t state,
111+ int y, int p, int comp, int bits, const int run_index)
112+{
113+ ivec2 sp = sc.slice_pos;
114+
115+ int w = sc.slice_dim.x;
116+ if (p > 0 && p < 3) {
117+ w >>= chroma_shift.x;
118+ sp >>= chroma_shift;
119+ }
120+
121+ for (int x = 0; x < w; x++) {
122+ const ivec2 d = get_diff(sp + ivec2(x, y), ivec2(x, y), p, comp, w, bits);
123+ put_symbol(sc.c, state + CONTEXT_SIZE*d[0], d[1]);
124+ }
125+}
126+
127+#else /* GOLOMB */
128+
129+void encode_line(inout SliceContext sc, uint64_t state,
130+ int y, int p, int comp, int bits, inout int run_index)
131+{
132+ ivec2 sp = sc.slice_pos;
133+
134+ int w = sc.slice_dim.x;
135+ if (p > 0 && p < 3) {
136+ w >>= chroma_shift.x;
137+ sp >>= chroma_shift;
138+ }
139+
140+ int run_count = 0;
141+ bool run_mode = false;
142+
143+ for (int x = 0; x < w; x++) {
144+ ivec2 d = get_diff(sp + ivec2(x, y), ivec2(x, y), p, comp, w, bits);
145+
146+ if (d[0] == 0)
147+ run_mode = true;
148+
149+ if (run_mode) {
150+ if (d[1] != 0) {
151+ /* A very unlikely loop */
152+ while (run_count >= 1 << log2_run[run_index]) {
153+ run_count -= 1 << log2_run[run_index];
154+ run_index++;
155+ put_bits(sc.pb, 1, 1);
156+ }
157+
158+ put_bits(sc.pb, 1 + log2_run[run_index], run_count);
159+ if (run_index != 0)
160+ run_index--;
161+ run_count = 0;
162+ run_mode = false;
163+ if (d[1] > 0)
164+ d[1]--;
165+ } else {
166+ run_count++;
167+ }
168+ }
169+
170+ if (!run_mode) {
171+ VlcState sb = VlcState(state + VLC_STATE_SIZE*d[0]);
172+ Symbol sym = get_vlc_symbol(sb, d[1], bits);
173+ put_bits(sc.pb, sym.bits, sym.val);
174+ }
175+ }
176+
177+ if (run_mode) {
178+ while (run_count >= (1 << log2_run[run_index])) {
179+ run_count -= 1 << log2_run[run_index];
180+ run_index++;
181+ put_bits(sc.pb, 1, 1);
182+ }
183+
184+ if (run_count > 0)
185+ put_bits(sc.pb, 1, 1);
186+ }
187+}
188+#endif
189+
23190 void encode_slice(inout SliceContext sc, const uint slice_idx)
24191 {
192+#ifndef RGB
25193 int bits = bits_per_raw_sample;
194+#else
195+ int bits = 9;
196+ if (bits != 8 || sc.slice_coding_mode != 0)
197+ bits = bits_per_raw_sample + int(sc.slice_coding_mode != 1);
198+#endif
26199
27200 #ifndef GOLOMB
28201 if (sc.slice_coding_mode == 1) {
202+#ifndef RGB
29203 for (int c = 0; c < components; c++) {
30204
31205 int h = sc.slice_dim.y;
@@ -39,12 +213,22 @@ void encode_slice(inout SliceContext sc, const uint slice_idx) · 7 unmodified lines
39213 for (int y = 0; y < h; y++)
40214 encode_line_pcm(sc, y, p, comp, bits);
41215 }
216+#else
217+ for (int y = 0; y < sc.slice_dim.y; y++) {
218+ encode_line_pcm(sc, y, 0, 1, bits);
219+ encode_line_pcm(sc, y, 0, 2, bits);
220+ encode_line_pcm(sc, y, 0, 0, bits);
221+ if (transparency == 1)
222+ encode_line_pcm(sc, y, 0, 3, bits);
223+ }
224+#endif
42225 } else
43226 #endif
44227 {
45228 uint64_t slice_state_off = uint64_t(slice_state) +
46229 slice_idx*plane_state_size*codec_planes;
47230
231+#ifndef RGB
48232 for (int c = 0; c < components; c++) {
49233 int run_index = 0;
50234
@@ -62,13 +246,67 @@ void encode_slice(inout SliceContext sc, const uint slice_idx) · 11 unmodified lines
62246 if (c != 1)
63247 slice_state_off += plane_state_size;
64248 }
249+#else
250+ int run_index = 0;
251+ for (int y = 0; y < sc.slice_dim.y; y++) {
252+ encode_line(sc, slice_state_off + plane_state_size*0,
253+ y, 0, 1, bits, run_index);
254+ encode_line(sc, slice_state_off + plane_state_size*1,
255+ y, 0, 2, bits, run_index);
256+ encode_line(sc, slice_state_off + plane_state_size*1,
257+ y, 0, 0, bits, run_index);
258+ if (transparency == 1)
259+ encode_line(sc, slice_state_off + plane_state_size*2,
260+ y, 0, 3, bits, run_index);
261+ }
262+#endif
263+ }
264+}
265+
266+void finalize_slice(inout SliceContext sc, const uint slice_idx)
267+{
268+#ifdef GOLOMB
269+ uint32_t enc_len = sc.hdr_len + flush_put_bits(sc.pb);
270+#else
271+ uint32_t enc_len = rac_terminate(sc.c);
272+#endif
273+
274+ u8buf bs = u8buf(sc.c.bytestream_start);
275+
276+ /* Append slice length */
277+ u8vec4 enc_len_p = unpack8(enc_len);
278+ bs[enc_len + 0].v = enc_len_p.z;
279+ bs[enc_len + 1].v = enc_len_p.y;
280+ bs[enc_len + 2].v = enc_len_p.x;
281+ enc_len += 3;
282+
283+ /* Calculate and write CRC */
284+ if (ec != 0) {
285+ bs[enc_len].v = uint8_t(0);
286+ enc_len++;
287+
288+ uint32_t crc = crcref;
289+ for (int i = 0; i < enc_len; i++)
290+ crc = crc_ieee[(crc & 0xFF) ^ uint32_t(bs[i].v)] ^ (crc >> 8);
291+
292+ if (crcref != 0x00000000)
293+ crc ^= 0x8CD88196;
294+
295+ u8vec4 crc_p = unpack8(crc);
296+ bs[enc_len + 0].v = crc_p.x;
297+ bs[enc_len + 1].v = crc_p.y;
298+ bs[enc_len + 2].v = crc_p.z;
299+ bs[enc_len + 3].v = crc_p.w;
300+ enc_len += 4;
65301 }
66302
67− finalize_slice(sc, slice_idx);
303+ slice_results[slice_idx*2 + 0] = enc_len;
304+ slice_results[slice_idx*2 + 1] = uint64_t(bs) - uint64_t(out_data);
68305 }
69306
70307 void main(void)
71308 {
72309 const uint slice_idx = gl_WorkGroupID.y*gl_NumWorkGroups.x + gl_WorkGroupID.x;
73310 encode_slice(slice_ctx[slice_idx], slice_idx);
311+ finalize_slice(slice_ctx[slice_idx], slice_idx);
74312 }
libavcodec/vulkan/ffv1_enc_ac.comp+0−83
@@ -1,83 +0,0 @@
1−/*
2− * Copyright (c) 2024 Lynne <dev@lynne.ee>
3− *
4− * This file is part of FFmpeg.
5− *
6− * FFmpeg is free software; you can redistribute it and/or
7− * modify it under the terms of the GNU Lesser General Public
8− * License as published by the Free Software Foundation; either
9− * version 2.1 of the License, or (at your option) any later version.
10− *
11− * FFmpeg is distributed in the hope that it will be useful,
12− * but WITHOUT ANY WARRANTY; without even the implied warranty of
13− * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14− * Lesser General Public License for more details.
15− *
16− * You should have received a copy of the GNU Lesser General Public
17− * License along with FFmpeg; if not, write to the Free Software
18− * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19− */
20−
21−void put_rac(inout RangeCoder c, uint64_t state, bool bit)
22−{
23− put_rac_norenorm(c, state, bit);
24− if (c.range < 0x100)
25− renorm_encoder(c);
26−}
27−
28−/* Note - only handles signed values */
29−void put_symbol(inout RangeCoder c, uint64_t state, int v)
30−{
31− bool is_nil = (v == 0);
32− put_rac(c, state, is_nil);
33− if (is_nil)
34− return;
35−
36− const int a = abs(v);
37− const int e = findMSB(a);
38−
39− state += 1;
40− for (int i = 0; i < e; i++)
41− put_rac(c, state + min(i, 9), true);
42− put_rac(c, state + min(e, 9), false);
43−
44− state += 21;
45− for (int i = e - 1; i >= 0; i--)
46− put_rac(c, state + min(i, 9), bool(bitfieldExtract(a, i, 1)));
47−
48− put_rac(c, state - 11 + min(e, 10), v < 0);
49−}
50−
51−void encode_line_pcm(inout SliceContext sc, int y, int p, int comp,
52− int bits)
53−{
54− ivec2 sp = sc.slice_pos;
55− int w = sc.slice_dim.x;
56− if (p > 0 && p < 3) {
57− w >>= chroma_shift.x;
58− sp >>= chroma_shift;
59− }
60−
61− for (int x = 0; x < w; x++) {
62− uint v = imageLoad(src[p], (sp + ivec2(x, y)))[comp];
63− for (int i = (bits - 1); i >= 0; i--)
64− put_rac_equi(sc.c, bool(bitfieldExtract(v, i, 1)));
65− }
66−}
67−
68−void encode_line(inout SliceContext sc, uint64_t state,
69− int y, int p, int comp, int bits, const int run_index)
70−{
71− ivec2 sp = sc.slice_pos;
72−
73− int w = sc.slice_dim.x;
74− if (p > 0 && p < 3) {
75− w >>= chroma_shift.x;
76− sp >>= chroma_shift;
77− }
78−
79− for (int x = 0; x < w; x++) {
80− const ivec2 d = get_diff(sp + ivec2(x, y), ivec2(x, y), p, comp, w, bits);
81− put_symbol(sc.c, state + CONTEXT_SIZE*d[0], d[1]);
82− }
83−}
libavcodec/vulkan/ffv1_enc_common.comp+0−101
@@ -1,101 +0,0 @@
1−/*
2− * FFv1 codec
3− *
4− * Copyright (c) 2024 Lynne <dev@lynne.ee>
5− *
6− * This file is part of FFmpeg.
7− *
8− * FFmpeg is free software; you can redistribute it and/or
9− * modify it under the terms of the GNU Lesser General Public
10− * License as published by the Free Software Foundation; either
11− * version 2.1 of the License, or (at your option) any later version.
12− *
13− * FFmpeg is distributed in the hope that it will be useful,
14− * but WITHOUT ANY WARRANTY; without even the implied warranty of
15− * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16− * Lesser General Public License for more details.
17− *
18− * You should have received a copy of the GNU Lesser General Public
19− * License along with FFmpeg; if not, write to the Free Software
20− * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21− */
22−
23−ivec2 get_diff(ivec2 pos, ivec2 off, int p, int comp, int sw, int bits)
24−{
25− const ivec2 yoff_border1 = off.x == 0 ? ivec2(1, -1) : ivec2(0, 0);
26− const ivec2 yoff_border2 = off.x == 1 ? ivec2(1, -1) : ivec2(0, 0);
27−
28− TYPE top2 = TYPE(0);
29− if (off.y > 1)
30− top2 = TYPE(imageLoad(src[p], pos + ivec2(0, -2))[comp]);
31−
32− VTYPE3 top = VTYPE3(TYPE(0),
33− TYPE(0),
34− TYPE(0));
35− if (off.y > 0 && off != ivec2(0, 1))
36− top[0] = TYPE(imageLoad(src[p], pos + ivec2(-1, -1) + yoff_border1)[comp]);
37− if (off.y > 0) {
38− top[1] = TYPE(imageLoad(src[p], pos + ivec2(0, -1))[comp]);
39− top[2] = TYPE(imageLoad(src[p], pos + ivec2(min(1, sw - off.x - 1), -1))[comp]);
40− }
41−
42− VTYPE3 cur = VTYPE3(TYPE(0),
43− TYPE(0),
44− imageLoad(src[p], pos)[comp]);
45− if (off.x > 0 && off != ivec2(1, 0))
46− cur[0] = TYPE(imageLoad(src[p], pos + ivec2(-2, 0) + yoff_border2)[comp]);
47− if (off != ivec2(0, 0))
48− cur[1] = TYPE(imageLoad(src[p], pos + ivec2(-1, 0) + yoff_border1)[comp]);
49−
50− /* context, diff */
51− ivec2 d = ivec2(get_context(VTYPE2(cur), top, top2, context_model),
52− cur[2] - predict(cur[1], VTYPE2(top)));
53−
54− if (d[0] < 0)
55− d = -d;
56−
57− d[1] = fold(d[1], bits);
58−
59− return d;
60−}
61−
62−void finalize_slice(inout SliceContext sc, const uint slice_idx)
63−{
64−#ifdef GOLOMB
65− uint32_t enc_len = sc.hdr_len + flush_put_bits(sc.pb);
66−#else
67− uint32_t enc_len = rac_terminate(sc.c);
68−#endif
69−
70− u8buf bs = u8buf(sc.c.bytestream_start);
71−
72− /* Append slice length */
73− u8vec4 enc_len_p = unpack8(enc_len);
74− bs[enc_len + 0].v = enc_len_p.z;
75− bs[enc_len + 1].v = enc_len_p.y;
76− bs[enc_len + 2].v = enc_len_p.x;
77− enc_len += 3;
78−
79− /* Calculate and write CRC */
80− if (ec != 0) {
81− bs[enc_len].v = uint8_t(0);
82− enc_len++;
83−
84− uint32_t crc = crcref;
85− for (int i = 0; i < enc_len; i++)
86− crc = crc_ieee[(crc & 0xFF) ^ uint32_t(bs[i].v)] ^ (crc >> 8);
87−
88− if (crcref != 0x00000000)
89− crc ^= 0x8CD88196;
90−
91− u8vec4 crc_p = unpack8(crc);
92− bs[enc_len + 0].v = crc_p.x;
93− bs[enc_len + 1].v = crc_p.y;
94− bs[enc_len + 2].v = crc_p.z;
95− bs[enc_len + 3].v = crc_p.w;
96− enc_len += 4;
97− }
98−
99− slice_results[slice_idx*2 + 0] = enc_len;
100− slice_results[slice_idx*2 + 1] = uint64_t(bs) - uint64_t(out_data);
101−}
libavcodec/vulkan/ffv1_enc_rgb.comp+0−83
@@ -1,83 +0,0 @@
1−/*
2− * FFv1 codec
3− *
4− * Copyright (c) 2024 Lynne <dev@lynne.ee>
5− *
6− * This file is part of FFmpeg.
7− *
8− * FFmpeg is free software; you can redistribute it and/or
9− * modify it under the terms of the GNU Lesser General Public
10− * License as published by the Free Software Foundation; either
11− * version 2.1 of the License, or (at your option) any later version.
12− *
13− * FFmpeg is distributed in the hope that it will be useful,
14− * but WITHOUT ANY WARRANTY; without even the implied warranty of
15− * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16− * Lesser General Public License for more details.
17− *
18− * You should have received a copy of the GNU Lesser General Public
19− * License along with FFmpeg; if not, write to the Free Software
20− * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21− */
22−
23−void encode_slice_rgb(inout SliceContext sc, const uint slice_idx)
24−{
25− int bits = 9;
26− if (bits != 8 || sc.slice_coding_mode != 0)
27− bits = bits_per_raw_sample + int(sc.slice_coding_mode != 1);
28−
29− int run_index = 0;
30−
31−#ifndef GOLOMB
32− if (sc.slice_coding_mode == 1) {
33− if (transparency == 1) {
34− for (int y = 0; y < sc.slice_dim.y; y++) {
35− encode_line_pcm(sc, y, 0, 1, bits);
36− encode_line_pcm(sc, y, 0, 2, bits);
37− encode_line_pcm(sc, y, 0, 0, bits);
38− encode_line_pcm(sc, y, 0, 3, bits);
39− }
40− } else {
41− for (int y = 0; y < sc.slice_dim.y; y++) {
42− encode_line_pcm(sc, y, 0, 1, bits);
43− encode_line_pcm(sc, y, 0, 2, bits);
44− encode_line_pcm(sc, y, 0, 0, bits);
45− }
46− }
47− } else
48−#endif
49− {
50− uint64_t slice_state_off = uint64_t(slice_state) +
51− slice_idx*plane_state_size*codec_planes;
52−
53− if (transparency == 1) {
54− for (int y = 0; y < sc.slice_dim.y; y++) {
55− encode_line(sc, slice_state_off + plane_state_size*0,
56− y, 0, 1, bits, run_index);
57− encode_line(sc, slice_state_off + plane_state_size*1,
58− y, 0, 2, bits, run_index);
59− encode_line(sc, slice_state_off + plane_state_size*1,
60− y, 0, 0, bits, run_index);
61− encode_line(sc, slice_state_off + plane_state_size*2,
62− y, 0, 3, bits, run_index);
63− }
64− } else {
65− for (int y = 0; y < sc.slice_dim.y; y++) {
66− encode_line(sc, slice_state_off + plane_state_size*0,
67− y, 0, 1, bits, run_index);
68− encode_line(sc, slice_state_off + plane_state_size*1,
69− y, 0, 2, bits, run_index);
70− encode_line(sc, slice_state_off + plane_state_size*1,
71− y, 0, 0, bits, run_index);
72− }
73− }
74− }
75−
76− finalize_slice(sc, slice_idx);
77−}
78−
79−void main(void)
80−{
81− const uint slice_idx = gl_WorkGroupID.y*gl_NumWorkGroups.x + gl_WorkGroupID.x;
82− encode_slice_rgb(slice_ctx[slice_idx], slice_idx);
83−}
libavcodec/vulkan/ffv1_enc_vlc.comp+0−112
@@ -1,112 +0,0 @@
1−/*
2− * FFv1 codec
3− *
4− * Copyright (c) 2024 Lynne <dev@lynne.ee>
5− *
6− * This file is part of FFmpeg.
7− *
8− * FFmpeg is free software; you can redistribute it and/or
9− * modify it under the terms of the GNU Lesser General Public
10− * License as published by the Free Software Foundation; either
11− * version 2.1 of the License, or (at your option) any later version.
12− *
13− * FFmpeg is distributed in the hope that it will be useful,
14− * but WITHOUT ANY WARRANTY; without even the implied warranty of
15− * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16− * Lesser General Public License for more details.
17− *
18− * You should have received a copy of the GNU Lesser General Public
19− * License along with FFmpeg; if not, write to the Free Software
20− * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21− */
22−
23−struct RLEState {
24− int count;
25− int diff;
26− int index;
27− bool mode;
28−};
29−
30−void calc_new_state(inout RLEState state, int context)
31−{
32− if (context == 0)
33− state.mode = false;
34−
35− if (!state.mode)
36− return;
37−
38− if (state.diff > 0) {
39− while (state.count >= (1 << log2_run[state.index])) {
40− state.count -= 1 << log2_run[state.index];
41− state.index++;
42− }
43− if (state.index > 0)
44− state.index--;
45− state.count = 0;
46− state.mode = false;
47− if (state.diff > 0)
48− state.diff--;
49− } else {
50− state.count++;
51− }
52−}
53−
54−void encode_line(inout SliceContext sc, uint64_t state,
55− int y, int p, int comp, int bits, inout int run_index)
56−{
57− ivec2 sp = sc.slice_pos;
58−
59− int w = sc.slice_dim.x;
60− if (p > 0 && p < 3) {
61− w >>= chroma_shift.x;
62− sp >>= chroma_shift;
63− }
64−
65− int run_count = 0;
66− bool run_mode = false;
67−
68− for (int x = 0; x < w; x++) {
69− ivec2 d = get_diff(sp + ivec2(x, y), ivec2(x, y), p, comp, w, bits);
70−
71− if (d[0] == 0)
72− run_mode = true;
73−
74− if (run_mode) {
75− if (d[1] != 0) {
76− /* A very unlikely loop */
77− while (run_count >= 1 << log2_run[run_index]) {
78− run_count -= 1 << log2_run[run_index];
79− run_index++;
80− put_bits(sc.pb, 1, 1);
81− }
82−
83− put_bits(sc.pb, 1 + log2_run[run_index], run_count);
84− if (run_index != 0)
85− run_index--;
86− run_count = 0;
87− run_mode = false;
88− if (d[1] > 0)
89− d[1]--;
90− } else {
91− run_count++;
92− }
93− }
94−
95− if (!run_mode) {
96− VlcState sb = VlcState(state + VLC_STATE_SIZE*d[0]);
97− Symbol sym = get_vlc_symbol(sb, d[1], bits);
98− put_bits(sc.pb, sym.bits, sym.val);
99− }
100− }
101−
102− if (run_mode) {
103− while (run_count >= (1 << log2_run[run_index])) {
104− run_count -= 1 << log2_run[run_index];
105− run_index++;
106− put_bits(sc.pb, 1, 1);
107− }
108−
109− if (run_count > 0)
110− put_bits(sc.pb, 1, 1);
111− }
112−}

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