FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/speedhqenc.c
Date: 2025-04-25 22:50:00
Exec Total Coverage
Lines: 127 134 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/thread.h"
31
32 #include "avcodec.h"
33 #include "codec_internal.h"
34 #include "mpeg12data.h"
35 #include "mpeg12vlc.h"
36 #include "mpegvideo.h"
37 #include "mpegvideodata.h"
38 #include "mpegvideoenc.h"
39 #include "rl.h"
40 #include "speedhq.h"
41 #include "speedhqenc.h"
42
43 static uint8_t speedhq_max_level[MAX_LEVEL + 1];
44 static uint8_t speedhq_index_run[MAX_RUN + 1];
45
46 /* Exactly the same as MPEG-2, except little-endian. */
47 static const uint16_t mpeg12_vlc_dc_lum_code_reversed[12] = {
48 0x1, 0x0, 0x2, 0x5, 0x3, 0x7, 0xF, 0x1F, 0x3F, 0x7F, 0xFF, 0x1FF
49 };
50 static const uint16_t mpeg12_vlc_dc_chroma_code_reversed[12] = {
51 0x0, 0x2, 0x1, 0x3, 0x7, 0xF, 0x1F, 0x3F, 0x7F, 0xFF, 0x1FF, 0x3FF
52 };
53
54 /* simple include everything table for dc, first byte is bits
55 * number next 3 are code */
56 static uint32_t speedhq_lum_dc_uni[512];
57 static uint32_t speedhq_chr_dc_uni[512];
58
59 static uint8_t uni_speedhq_ac_vlc_len[64 * 64 * 2];
60
61 typedef struct SpeedHQEncContext {
62 MPVMainEncContext m;
63
64 int slice_start;
65 } SpeedHQEncContext;
66
67 9 static av_cold void speedhq_init_static_data(void)
68 {
69 9 ff_rl_init_level_run(speedhq_max_level, speedhq_index_run,
70 ff_speedhq_run, ff_speedhq_level, SPEEDHQ_RL_NB_ELEMS);
71
72 /* build unified dc encoding tables */
73
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 4608 for (int i = -255; i < 256; i++) {
74 int adiff, index;
75 int bits, code;
76 4599 int diff = i;
77
78 4599 adiff = FFABS(diff);
79
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 4599 if (diff < 0)
80 2295 diff--;
81 4599 index = av_log2(2 * adiff);
82
83 4599 bits = ff_mpeg12_vlc_dc_lum_bits[index] + index;
84 4599 code = mpeg12_vlc_dc_lum_code_reversed[index] +
85 4599 (av_zero_extend(diff, index) << ff_mpeg12_vlc_dc_lum_bits[index]);
86 4599 speedhq_lum_dc_uni[i + 255] = bits + (code << 8);
87
88 4599 bits = ff_mpeg12_vlc_dc_chroma_bits[index] + index;
89 4599 code = mpeg12_vlc_dc_chroma_code_reversed[index] +
90 4599 (av_zero_extend(diff, index) << ff_mpeg12_vlc_dc_chroma_bits[index]);
91 4599 speedhq_chr_dc_uni[i + 255] = bits + (code << 8);
92 }
93
94 9 ff_mpeg1_init_uni_ac_vlc(speedhq_max_level, speedhq_index_run,
95 ff_speedhq_vlc_table, uni_speedhq_ac_vlc_len);
96 9 }
97
98 450 static int speedhq_encode_picture_header(MPVMainEncContext *const m)
99 {
100 450 SpeedHQEncContext *const ctx = (SpeedHQEncContext*)m;
101 450 MPVEncContext *const s = &m->s;
102
103 450 put_bits_le(&s->pb, 8, 100 - s->c.qscale * 2); /* FIXME why doubled */
104 450 put_bits_le(&s->pb, 24, 4); /* no second field */
105
106 450 ctx->slice_start = 4;
107 /* length of first slice, will be filled out later */
108 450 put_bits_le(&s->pb, 24, 0);
109
110 450 return 0;
111 }
112
113 1800 void ff_speedhq_end_slice(MPVEncContext *const s)
114 {
115 1800 SpeedHQEncContext *ctx = (SpeedHQEncContext*)s;
116 int slice_len;
117
118 1800 flush_put_bits_le(&s->pb);
119 1800 slice_len = put_bytes_output(&s->pb) - ctx->slice_start;
120 1800 AV_WL24(s->pb.buf + ctx->slice_start, slice_len);
121
122 /* length of next slice, will be filled out later */
123 1800 ctx->slice_start = put_bytes_output(&s->pb);
124 1800 put_bits_le(&s->pb, 24, 0);
125 1800 }
126
127 1544400 static inline void encode_dc(PutBitContext *pb, int diff, int component)
128 {
129 1544400 unsigned int diff_u = diff + 255;
130
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 1544400 if (diff_u >= 511) {
131 int index;
132
133
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 329487 if (diff < 0) {
134 169357 index = av_log2_16bit(-2 * diff);
135 169357 diff--;
136 } else {
137 160130 index = av_log2_16bit(2 * diff);
138 }
139
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 329487 if (component == 0)
140 239838 put_bits_le(pb,
141 239838 ff_mpeg12_vlc_dc_lum_bits[index] + index,
142 239838 mpeg12_vlc_dc_lum_code_reversed[index] +
143 239838 (av_zero_extend(diff, index) << ff_mpeg12_vlc_dc_lum_bits[index]));
144 else
145 89649 put_bits_le(pb,
146 89649 ff_mpeg12_vlc_dc_chroma_bits[index] + index,
147 89649 mpeg12_vlc_dc_chroma_code_reversed[index] +
148 89649 (av_zero_extend(diff, index) << ff_mpeg12_vlc_dc_chroma_bits[index]));
149 } else {
150
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 1214913 if (component == 0)
151 472962 put_bits_le(pb,
152 472962 speedhq_lum_dc_uni[diff + 255] & 0xFF,
153 472962 speedhq_lum_dc_uni[diff + 255] >> 8);
154 else
155 741951 put_bits_le(pb,
156 741951 speedhq_chr_dc_uni[diff + 255] & 0xFF,
157 741951 speedhq_chr_dc_uni[diff + 255] >> 8);
158 }
159 1544400 }
160
161 1544400 static void encode_block(MPVEncContext *const s, const int16_t block[], int n)
162 {
163 int alevel, level, last_non_zero, dc, i, j, run, last_index, sign;
164 int code;
165 int component, val;
166
167 /* DC coef */
168
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 1544400 component = (n <= 3 ? 0 : (n&1) + 1);
169 1544400 dc = block[0]; /* overflow is impossible */
170 1544400 val = s->c.last_dc[component] - dc; /* opposite of most codecs */
171 1544400 encode_dc(&s->pb, val, component);
172 1544400 s->c.last_dc[component] = dc;
173
174 /* now quantify & encode AC coefs */
175 1544400 last_non_zero = 0;
176 1544400 last_index = s->c.block_last_index[n];
177
178
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 13504896 for (i = 1; i <= last_index; i++) {
179 11960496 j = s->c.intra_scantable.permutated[i];
180 11960496 level = block[j];
181
182 /* encode using VLC */
183
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 11960496 if (level != 0) {
184 5766974 run = i - last_non_zero - 1;
185
186 5766974 alevel = level;
187 5766974 MASK_ABS(sign, alevel);
188 5766974 sign &= 1;
189
190
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 5766974 if (alevel <= speedhq_max_level[run]) {
191 5741265 code = speedhq_index_run[run] + alevel - 1;
192 /* store the VLC & sign at once */
193 5741265 put_bits_le(&s->pb, ff_speedhq_vlc_table[code][1] + 1,
194 5741265 ff_speedhq_vlc_table[code][0] | (sign << ff_speedhq_vlc_table[code][1]));
195 } else {
196 /* escape seems to be pretty rare <5% so I do not optimize it;
197 * The following encodes the escape value 100000b together with
198 * run and level. */
199 25709 put_bits_le(&s->pb, 6 + 6 + 12, 0x20 | run << 6 |
200 25709 (level + 2048) << 12);
201 }
202 5766974 last_non_zero = i;
203 }
204 }
205 /* end of block; the values correspond to ff_speedhq_vlc_table[122] */
206 1544400 put_bits_le(&s->pb, 4, 6);
207 1544400 }
208
209 178200 static void speedhq_encode_mb(MPVEncContext *const s, int16_t block[12][64],
210 int unused_x, int unused_y)
211 {
212 int i;
213
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214 1069200 encode_block(s, block[i], i);
215 }
216
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 178200 if (s->c.chroma_format == CHROMA_444) {
217 59400 encode_block(s, block[8], 8);
218 59400 encode_block(s, block[9], 9);
219
220 59400 encode_block(s, block[6], 6);
221 59400 encode_block(s, block[7], 7);
222
223 59400 encode_block(s, block[10], 10);
224 59400 encode_block(s, block[11], 11);
225
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 118800 } else if (s->c.chroma_format == CHROMA_422) {
226 59400 encode_block(s, block[6], 6);
227 59400 encode_block(s, block[7], 7);
228 }
229
230 178200 s->i_tex_bits += get_bits_diff(s);
231 178200 }
232
233 9 static av_cold int speedhq_encode_init(AVCodecContext *avctx)
234 {
235 static AVOnce init_static_once = AV_ONCE_INIT;
236 9 MPVMainEncContext *const m = avctx->priv_data;
237 9 MPVEncContext *const s = &m->s;
238 int ret;
239
240
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 9 if (avctx->width > 65500 || avctx->height > 65500) {
241 ✗ av_log(avctx, AV_LOG_ERROR, "SpeedHQ does not support resolutions above 65500x65500\n");
242 ✗ return AVERROR(EINVAL);
243 }
244
245 // border is not implemented correctly at the moment, see ticket #10078
246
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 9 if (avctx->width % 16) {
247 ✗ av_log(avctx, AV_LOG_ERROR, "width must be a multiple of 16\n");
248 ✗ return AVERROR_PATCHWELCOME;
249 }
250
251
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 9 switch (avctx->pix_fmt) {
252 3 case AV_PIX_FMT_YUV420P:
253 3 avctx->codec_tag = MKTAG('S','H','Q','0');
254 3 break;
255 3 case AV_PIX_FMT_YUV422P:
256 3 avctx->codec_tag = MKTAG('S','H','Q','2');
257 3 break;
258 3 case AV_PIX_FMT_YUV444P:
259 3 avctx->codec_tag = MKTAG('S','H','Q','4');
260 3 break;
261 ✗ default:
262 ✗ av_assert0(0);
263 }
264
265 9 m->encode_picture_header = speedhq_encode_picture_header;
266 9 s->encode_mb = speedhq_encode_mb;
267
268 9 s->min_qcoeff = -2048;
269 9 s->max_qcoeff = 2047;
270
271 9 s->intra_ac_vlc_length =
272 9 s->intra_ac_vlc_last_length =
273 9 s->intra_chroma_ac_vlc_length =
274 9 s->intra_chroma_ac_vlc_last_length = uni_speedhq_ac_vlc_len;
275
276 9 s->c.y_dc_scale_table =
277 9 s->c.c_dc_scale_table = ff_mpeg12_dc_scale_table[3];
278
279 9 ret = ff_mpv_encode_init(avctx);
280
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 9 if (ret < 0)
281 ✗ return ret;
282
283 9 ff_thread_once(&init_static_once, speedhq_init_static_data);
284
285 9 return 0;
286 }
287
288 const FFCodec ff_speedhq_encoder = {
289 .p.name = "speedhq",
290 CODEC_LONG_NAME("NewTek SpeedHQ"),
291 .p.type = AVMEDIA_TYPE_VIDEO,
292 .p.id = AV_CODEC_ID_SPEEDHQ,
293 .p.priv_class = &ff_mpv_enc_class,
294 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
295 .priv_data_size = sizeof(SpeedHQEncContext),
296 .init = speedhq_encode_init,
297 FF_CODEC_ENCODE_CB(ff_mpv_encode_picture),
298 .close = ff_mpv_encode_end,
299 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
300 .color_ranges = AVCOL_RANGE_MPEG,
301 CODEC_PIXFMTS(AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P),
302 };
303