FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/speedhqenc.c
Date: 2026-01-16 07:34:38
Exec Total Coverage
Lines: 128 135 94.8%
Functions: 7 7 100.0%
Branches: 33 38 86.8%
Line Branch Exec Source
1 /*
2 * SpeedHQ encoder
3 * Copyright (c) 2000, 2001 Fabrice Bellard
4 * Copyright (c) 2003 Alex Beregszaszi
5 * Copyright (c) 2003-2004 Michael Niedermayer
6 * Copyright (c) 2020 FFmpeg
7 *
8 * This file is part of FFmpeg.
9 *
10 * FFmpeg is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
14 *
15 * FFmpeg is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with FFmpeg; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25 /**
26 * @file
27 * SpeedHQ encoder.
28 */
29
30 #include "libavutil/avassert.h"
31 #include "libavutil/thread.h"
32
33 #include "avcodec.h"
34 #include "codec_internal.h"
35 #include "mathops.h"
36 #include "mpeg12data.h"
37 #include "mpeg12vlc.h"
38 #include "mpegvideo.h"
39 #include "mpegvideodata.h"
40 #include "mpegvideoenc.h"
41 #include "put_bits.h"
42 #include "rl.h"
43 #include "speedhq.h"
44 #include "speedhqenc.h"
45
46 static uint8_t speedhq_max_level[MAX_LEVEL + 1];
47 static uint8_t speedhq_index_run[MAX_RUN + 1];
48
49 /* Exactly the same as MPEG-2, except little-endian. */
50 static const uint16_t mpeg12_vlc_dc_lum_code_reversed[12] = {
51 0x1, 0x0, 0x2, 0x5, 0x3, 0x7, 0xF, 0x1F, 0x3F, 0x7F, 0xFF, 0x1FF
52 };
53 static const uint16_t mpeg12_vlc_dc_chroma_code_reversed[12] = {
54 0x0, 0x2, 0x1, 0x3, 0x7, 0xF, 0x1F, 0x3F, 0x7F, 0xFF, 0x1FF, 0x3FF
55 };
56
57 /* simple include everything table for dc, first byte is bits
58 * number next 3 are code */
59 static uint32_t speedhq_lum_dc_uni[512];
60 static uint32_t speedhq_chr_dc_uni[512];
61
62 static uint8_t uni_speedhq_ac_vlc_len[64 * 64 * 2];
63
64 typedef struct SpeedHQEncContext {
65 MPVMainEncContext m;
66
67 int slice_start;
68 } SpeedHQEncContext;
69
70 9 static av_cold void speedhq_init_static_data(void)
71 {
72 9 ff_rl_init_level_run(speedhq_max_level, speedhq_index_run,
73 ff_speedhq_run, ff_speedhq_level, SPEEDHQ_RL_NB_ELEMS);
74
75 /* build unified dc encoding tables */
76
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 4608 for (int i = -255; i < 256; i++) {
77 int adiff, index;
78 int bits, code;
79 4599 int diff = i;
80
81 4599 adiff = FFABS(diff);
82
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 4599 if (diff < 0)
83 2295 diff--;
84 4599 index = av_log2(2 * adiff);
85
86 4599 bits = ff_mpeg12_vlc_dc_lum_bits[index] + index;
87 4599 code = mpeg12_vlc_dc_lum_code_reversed[index] +
88 4599 (av_zero_extend(diff, index) << ff_mpeg12_vlc_dc_lum_bits[index]);
89 4599 speedhq_lum_dc_uni[i + 255] = bits + (code << 8);
90
91 4599 bits = ff_mpeg12_vlc_dc_chroma_bits[index] + index;
92 4599 code = mpeg12_vlc_dc_chroma_code_reversed[index] +
93 4599 (av_zero_extend(diff, index) << ff_mpeg12_vlc_dc_chroma_bits[index]);
94 4599 speedhq_chr_dc_uni[i + 255] = bits + (code << 8);
95 }
96
97 9 ff_mpeg1_init_uni_ac_vlc(speedhq_max_level, speedhq_index_run,
98 ff_speedhq_vlc_table, uni_speedhq_ac_vlc_len);
99 9 }
100
101 450 static int speedhq_encode_picture_header(MPVMainEncContext *const m)
102 {
103 450 SpeedHQEncContext *const ctx = (SpeedHQEncContext*)m;
104 450 MPVEncContext *const s = &m->s;
105
106 450 put_bits_assume_flushed(&s->pb);
107
108 450 put_bits_le(&s->pb, 8, 100 - s->c.qscale * 2); /* FIXME why doubled */
109 450 put_bits_le(&s->pb, 24, 4); /* no second field */
110
111 450 ctx->slice_start = 4;
112 /* length of first slice, will be filled out later */
113 450 put_bits_le(&s->pb, 24, 0);
114
115 450 return 0;
116 }
117
118 1800 void ff_speedhq_end_slice(MPVEncContext *const s)
119 {
120 1800 SpeedHQEncContext *ctx = (SpeedHQEncContext*)s;
121 int slice_len;
122
123 1800 flush_put_bits_le(&s->pb);
124 1800 slice_len = put_bytes_output(&s->pb) - ctx->slice_start;
125 1800 AV_WL24(s->pb.buf + ctx->slice_start, slice_len);
126
127 /* length of next slice, will be filled out later */
128 1800 ctx->slice_start = put_bytes_output(&s->pb);
129 1800 put_bits_le(&s->pb, 24, 0);
130 1800 }
131
132 1544400 static inline void encode_dc(PutBitContext *pb, int diff, int component)
133 {
134 1544400 unsigned int diff_u = diff + 255;
135
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 1544400 if (diff_u >= 511) {
136 int index;
137
138
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 329487 if (diff < 0) {
139 169357 index = av_log2_16bit(-2 * diff);
140 169357 diff--;
141 } else {
142 160130 index = av_log2_16bit(2 * diff);
143 }
144
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 329487 if (component == 0)
145 239838 put_bits_le(pb,
146 239838 ff_mpeg12_vlc_dc_lum_bits[index] + index,
147 239838 mpeg12_vlc_dc_lum_code_reversed[index] +
148 239838 (av_zero_extend(diff, index) << ff_mpeg12_vlc_dc_lum_bits[index]));
149 else
150 89649 put_bits_le(pb,
151 89649 ff_mpeg12_vlc_dc_chroma_bits[index] + index,
152 89649 mpeg12_vlc_dc_chroma_code_reversed[index] +
153 89649 (av_zero_extend(diff, index) << ff_mpeg12_vlc_dc_chroma_bits[index]));
154 } else {
155
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 1214913 if (component == 0)
156 472962 put_bits_le(pb,
157 472962 speedhq_lum_dc_uni[diff + 255] & 0xFF,
158 472962 speedhq_lum_dc_uni[diff + 255] >> 8);
159 else
160 741951 put_bits_le(pb,
161 741951 speedhq_chr_dc_uni[diff + 255] & 0xFF,
162 741951 speedhq_chr_dc_uni[diff + 255] >> 8);
163 }
164 1544400 }
165
166 1544400 static void encode_block(MPVEncContext *const s, const int16_t block[], int n)
167 {
168 int alevel, level, last_non_zero, dc, i, j, run, last_index, sign;
169 int code;
170 int component, val;
171
172 /* DC coef */
173
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 1544400 component = (n <= 3 ? 0 : (n&1) + 1);
174 1544400 dc = block[0]; /* overflow is impossible */
175 1544400 val = s->last_dc[component] - dc; /* opposite of most codecs */
176 1544400 encode_dc(&s->pb, val, component);
177 1544400 s->last_dc[component] = dc;
178
179 /* now quantify & encode AC coefs */
180 1544400 last_non_zero = 0;
181 1544400 last_index = s->c.block_last_index[n];
182
183
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 13504896 for (i = 1; i <= last_index; i++) {
184 11960496 j = s->c.intra_scantable.permutated[i];
185 11960496 level = block[j];
186
187 /* encode using VLC */
188
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 11960496 if (level != 0) {
189 5766974 run = i - last_non_zero - 1;
190
191 5766974 alevel = level;
192 5766974 MASK_ABS(sign, alevel);
193 5766974 sign &= 1;
194
195
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 5766974 if (alevel <= speedhq_max_level[run]) {
196 5741265 code = speedhq_index_run[run] + alevel - 1;
197 /* store the VLC & sign at once */
198 5741265 put_bits_le(&s->pb, ff_speedhq_vlc_table[code][1] + 1,
199 5741265 ff_speedhq_vlc_table[code][0] | (sign << ff_speedhq_vlc_table[code][1]));
200 } else {
201 /* escape seems to be pretty rare <5% so I do not optimize it;
202 * The following encodes the escape value 100000b together with
203 * run and level. */
204 25709 put_bits_le(&s->pb, 6 + 6 + 12, 0x20 | run << 6 |
205 25709 (level + 2048) << 12);
206 }
207 5766974 last_non_zero = i;
208 }
209 }
210 /* end of block; the values correspond to ff_speedhq_vlc_table[122] */
211 1544400 put_bits_le(&s->pb, 4, 6);
212 1544400 }
213
214 178200 static void speedhq_encode_mb(MPVEncContext *const s, int16_t block[12][64],
215 int unused_x, int unused_y)
216 {
217 int i;
218
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219 1069200 encode_block(s, block[i], i);
220 }
221
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 178200 if (s->c.chroma_format == CHROMA_444) {
222 59400 encode_block(s, block[8], 8);
223 59400 encode_block(s, block[9], 9);
224
225 59400 encode_block(s, block[6], 6);
226 59400 encode_block(s, block[7], 7);
227
228 59400 encode_block(s, block[10], 10);
229 59400 encode_block(s, block[11], 11);
230
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 118800 } else if (s->c.chroma_format == CHROMA_422) {
231 59400 encode_block(s, block[6], 6);
232 59400 encode_block(s, block[7], 7);
233 }
234
235 178200 s->i_tex_bits += get_bits_diff(s);
236 178200 }
237
238 9 static av_cold int speedhq_encode_init(AVCodecContext *avctx)
239 {
240 static AVOnce init_static_once = AV_ONCE_INIT;
241 9 MPVMainEncContext *const m = avctx->priv_data;
242 9 MPVEncContext *const s = &m->s;
243 int ret;
244
245
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 9 if (avctx->width > 65500 || avctx->height > 65500) {
246 ✗ av_log(avctx, AV_LOG_ERROR, "SpeedHQ does not support resolutions above 65500x65500\n");
247 ✗ return AVERROR(EINVAL);
248 }
249
250 // border is not implemented correctly at the moment, see ticket #10078
251
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 9 if (avctx->width % 16) {
252 ✗ av_log(avctx, AV_LOG_ERROR, "width must be a multiple of 16\n");
253 ✗ return AVERROR_PATCHWELCOME;
254 }
255
256
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 9 switch (avctx->pix_fmt) {
257 3 case AV_PIX_FMT_YUV420P:
258 3 avctx->codec_tag = MKTAG('S','H','Q','0');
259 3 break;
260 3 case AV_PIX_FMT_YUV422P:
261 3 avctx->codec_tag = MKTAG('S','H','Q','2');
262 3 break;
263 3 case AV_PIX_FMT_YUV444P:
264 3 avctx->codec_tag = MKTAG('S','H','Q','4');
265 3 break;
266 ✗ default:
267 ✗ av_unreachable("Already checked via CODEC_PIXFMTS");
268 }
269
270 9 m->encode_picture_header = speedhq_encode_picture_header;
271 9 s->encode_mb = speedhq_encode_mb;
272
273 9 s->min_qcoeff = -2048;
274 9 s->max_qcoeff = 2047;
275
276 9 s->intra_ac_vlc_length =
277 9 s->intra_ac_vlc_last_length =
278 9 s->intra_chroma_ac_vlc_length =
279 9 s->intra_chroma_ac_vlc_last_length = uni_speedhq_ac_vlc_len;
280
281 9 s->c.y_dc_scale_table =
282 9 s->c.c_dc_scale_table = ff_mpeg12_dc_scale_table[3];
283
284 9 ret = ff_mpv_encode_init(avctx);
285
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 9 if (ret < 0)
286 ✗ return ret;
287
288 9 ff_thread_once(&init_static_once, speedhq_init_static_data);
289
290 9 return 0;
291 }
292
293 const FFCodec ff_speedhq_encoder = {
294 .p.name = "speedhq",
295 CODEC_LONG_NAME("NewTek SpeedHQ"),
296 .p.type = AVMEDIA_TYPE_VIDEO,
297 .p.id = AV_CODEC_ID_SPEEDHQ,
298 .p.priv_class = &ff_mpv_enc_class,
299 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
300 .priv_data_size = sizeof(SpeedHQEncContext),
301 .init = speedhq_encode_init,
302 FF_CODEC_ENCODE_CB(ff_mpv_encode_picture),
303 .close = ff_mpv_encode_end,
304 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
305 .color_ranges = AVCOL_RANGE_MPEG,
306 CODEC_PIXFMTS(AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P),
307 };
308