FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/speedhqdec.c
Date: 2024-04-25 05:10:44
Exec Total Coverage
Lines: 191 330 57.9%
Functions: 8 10 80.0%
Branches: 90 201 44.8%
Line Branch Exec Source
1 /*
2 * NewTek SpeedHQ codec
3 * Copyright 2017 Steinar H. Gunderson
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * NewTek SpeedHQ decoder.
25 */
26
27 #define BITSTREAM_READER_LE
28
29 #include "libavutil/attributes.h"
30 #include "libavutil/mem_internal.h"
31
32 #include "avcodec.h"
33 #include "blockdsp.h"
34 #include "codec_internal.h"
35 #include "decode.h"
36 #include "get_bits.h"
37 #include "idctdsp.h"
38 #include "libavutil/thread.h"
39 #include "mathops.h"
40 #include "mpeg12data.h"
41 #include "mpeg12vlc.h"
42 #include "speedhq.h"
43
44 #define MAX_INDEX (64 - 1)
45
46 /*
47 * 5 bits makes for very small tables, with no more than two lookups needed
48 * for the longest (10-bit) codes.
49 */
50 #define ALPHA_VLC_BITS 5
51
52 typedef struct SHQContext {
53 BlockDSPContext bdsp;
54 IDCTDSPContext idsp;
55 uint8_t permutated_intra_scantable[64];
56 int quant_matrix[64];
57 enum { SHQ_SUBSAMPLING_420, SHQ_SUBSAMPLING_422, SHQ_SUBSAMPLING_444 }
58 subsampling;
59 enum { SHQ_NO_ALPHA, SHQ_RLE_ALPHA, SHQ_DCT_ALPHA } alpha_type;
60 } SHQContext;
61
62 /* NOTE: The first element is always 16, unscaled. */
63 static const uint8_t unscaled_quant_matrix[64] = {
64 16, 16, 19, 22, 26, 27, 29, 34,
65 16, 16, 22, 24, 27, 29, 34, 37,
66 19, 22, 26, 27, 29, 34, 34, 38,
67 22, 22, 26, 27, 29, 34, 37, 40,
68 22, 26, 27, 29, 32, 35, 40, 48,
69 26, 27, 29, 32, 35, 40, 48, 58,
70 26, 27, 29, 34, 38, 46, 56, 69,
71 27, 29, 35, 38, 46, 56, 69, 83
72 };
73
74 static VLCElem dc_lum_vlc_le[512];
75 static VLCElem dc_chroma_vlc_le[514];
76 static VLCElem dc_alpha_run_vlc_le[160];
77 static VLCElem dc_alpha_level_vlc_le[288];
78
79 static RL_VLC_ELEM speedhq_rl_vlc[674];
80
81 1544736 static inline int decode_dc_le(GetBitContext *gb, int component)
82 {
83 int code, diff;
84
85
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 1544736 if (component == 0 || component == 3) {
86 712968 code = get_vlc2(gb, dc_lum_vlc_le, DC_VLC_BITS, 2);
87 } else {
88 831768 code = get_vlc2(gb, dc_chroma_vlc_le, DC_VLC_BITS, 2);
89 }
90
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 1544736 if (!code) {
91 9976 diff = 0;
92 } else {
93 1534760 diff = get_xbits_le(gb, code);
94 }
95 1544736 return diff;
96 }
97
98 ✗ static inline int decode_alpha_block(const SHQContext *s, GetBitContext *gb, uint8_t last_alpha[16], uint8_t *dest, int linesize)
99 {
100 uint8_t block[128];
101 ✗ int i = 0, x, y;
102
103 ✗ memset(block, 0, sizeof(block));
104
105 {
106 ✗ OPEN_READER(re, gb);
107
108 ✗ for ( ;; ) {
109 int run, level;
110
111 ✗ UPDATE_CACHE_LE(re, gb);
112 ✗ GET_VLC(run, re, gb, dc_alpha_run_vlc_le, ALPHA_VLC_BITS, 2);
113
114 ✗ if (run < 0) break;
115 ✗ i += run;
116 ✗ if (i >= 128)
117 ✗ return AVERROR_INVALIDDATA;
118
119 ✗ UPDATE_CACHE_LE(re, gb);
120 ✗ GET_VLC(level, re, gb, dc_alpha_level_vlc_le, ALPHA_VLC_BITS, 2);
121 ✗ block[i++] = level;
122 }
123
124 ✗ CLOSE_READER(re, gb);
125 }
126
127 ✗ for (y = 0; y < 8; y++) {
128 ✗ for (x = 0; x < 16; x++) {
129 ✗ last_alpha[x] -= block[y * 16 + x];
130 }
131 ✗ memcpy(dest, last_alpha, 16);
132 ✗ dest += linesize;
133 }
134
135 ✗ return 0;
136 }
137
138 1544736 static inline int decode_dct_block(const SHQContext *s, GetBitContext *gb, int last_dc[4], int component, uint8_t *dest, int linesize)
139 {
140 1544736 const int *quant_matrix = s->quant_matrix;
141 1544736 const uint8_t *scantable = s->permutated_intra_scantable;
142 1544736 LOCAL_ALIGNED_32(int16_t, block, [64]);
143 int dc_offset;
144
145 1544736 s->bdsp.clear_block(block);
146
147 1544736 dc_offset = decode_dc_le(gb, component);
148 1544736 last_dc[component] -= dc_offset; /* Note: Opposite of most codecs. */
149 1544736 block[scantable[0]] = last_dc[component]; /* quant_matrix[0] is always 16. */
150
151 /* Read AC coefficients. */
152 {
153 1544736 int i = 0;
154 1544736 OPEN_READER(re, gb);
155 5781637 for ( ;; ) {
156 int level, run;
157 7326373 UPDATE_CACHE_LE(re, gb);
158
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 7326373 GET_RL_VLC(level, run, re, gb, speedhq_rl_vlc,
159 TEX_VLC_BITS, 2, 0);
160
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 7326373 if (level == 127) {
161 1544736 break;
162
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 5781637 } else if (level) {
163 5755452 i += run;
164
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 5755452 if (i > MAX_INDEX)
165 ✗ return AVERROR_INVALIDDATA;
166 /* If next bit is 1, level = -level */
167 5755452 level = (level ^ SHOW_SBITS(re, gb, 1)) -
168 5755452 SHOW_SBITS(re, gb, 1);
169 5755452 LAST_SKIP_BITS(re, gb, 1);
170 } else {
171 /* Escape. */
172 #if MIN_CACHE_BITS < 6 + 6 + 12
173 #error MIN_CACHE_BITS is too small for the escape code, add UPDATE_CACHE
174 #endif
175 26185 run = SHOW_UBITS(re, gb, 6) + 1;
176 26185 SKIP_BITS(re, gb, 6);
177 26185 level = SHOW_UBITS(re, gb, 12) - 2048;
178 26185 LAST_SKIP_BITS(re, gb, 12);
179
180 26185 i += run;
181
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 26185 if (i > MAX_INDEX)
182 ✗ return AVERROR_INVALIDDATA;
183 }
184
185 5781637 block[scantable[i]] = (level * quant_matrix[i]) >> 4;
186 }
187 1544736 CLOSE_READER(re, gb);
188 }
189
190 1544736 s->idsp.idct_put(dest, linesize, block);
191
192 1544736 return 0;
193 }
194
195 ✗ static int decode_speedhq_border(const SHQContext *s, GetBitContext *gb, AVFrame *frame, int field_number, int line_stride)
196 {
197 ✗ int linesize_y = frame->linesize[0] * line_stride;
198 ✗ int linesize_cb = frame->linesize[1] * line_stride;
199 ✗ int linesize_cr = frame->linesize[2] * line_stride;
200 int linesize_a;
201 int ret;
202
203 ✗ if (s->alpha_type != SHQ_NO_ALPHA)
204 ✗ linesize_a = frame->linesize[3] * line_stride;
205
206 ✗ for (int y = 0; y < frame->height; y += 16 * line_stride) {
207 ✗ int last_dc[4] = { 1024, 1024, 1024, 1024 };
208 uint8_t *dest_y, *dest_cb, *dest_cr, *dest_a;
209 uint8_t last_alpha[16];
210 ✗ int x = frame->width - 8;
211
212 ✗ dest_y = frame->data[0] + frame->linesize[0] * (y + field_number) + x;
213 ✗ if (s->subsampling == SHQ_SUBSAMPLING_420) {
214 ✗ dest_cb = frame->data[1] + frame->linesize[1] * (y/2 + field_number) + x / 2;
215 ✗ dest_cr = frame->data[2] + frame->linesize[2] * (y/2 + field_number) + x / 2;
216 } else {
217 av_assert2(s->subsampling == SHQ_SUBSAMPLING_422);
218 ✗ dest_cb = frame->data[1] + frame->linesize[1] * (y + field_number) + x / 2;
219 ✗ dest_cr = frame->data[2] + frame->linesize[2] * (y + field_number) + x / 2;
220 }
221 ✗ if (s->alpha_type != SHQ_NO_ALPHA) {
222 ✗ memset(last_alpha, 255, sizeof(last_alpha));
223 ✗ dest_a = frame->data[3] + frame->linesize[3] * (y + field_number) + x;
224 }
225
226 ✗ if ((ret = decode_dct_block(s, gb, last_dc, 0, dest_y, linesize_y)) < 0)
227 ✗ return ret;
228 ✗ if ((ret = decode_dct_block(s, gb, last_dc, 0, dest_y + 8, linesize_y)) < 0)
229 ✗ return ret;
230 ✗ if ((ret = decode_dct_block(s, gb, last_dc, 0, dest_y + 8 * linesize_y, linesize_y)) < 0)
231 ✗ return ret;
232 ✗ if ((ret = decode_dct_block(s, gb, last_dc, 0, dest_y + 8 * linesize_y + 8, linesize_y)) < 0)
233 ✗ return ret;
234 ✗ if ((ret = decode_dct_block(s, gb, last_dc, 1, dest_cb, linesize_cb)) < 0)
235 ✗ return ret;
236 ✗ if ((ret = decode_dct_block(s, gb, last_dc, 2, dest_cr, linesize_cr)) < 0)
237 ✗ return ret;
238
239 ✗ if (s->subsampling != SHQ_SUBSAMPLING_420) {
240 ✗ if ((ret = decode_dct_block(s, gb, last_dc, 1, dest_cb + 8 * linesize_cb, linesize_cb)) < 0)
241 ✗ return ret;
242 ✗ if ((ret = decode_dct_block(s, gb, last_dc, 2, dest_cr + 8 * linesize_cr, linesize_cr)) < 0)
243 ✗ return ret;
244 }
245
246 ✗ if (s->alpha_type == SHQ_RLE_ALPHA) {
247 /* Alpha coded using 16x8 RLE blocks. */
248 ✗ if ((ret = decode_alpha_block(s, gb, last_alpha, dest_a, linesize_a)) < 0)
249 ✗ return ret;
250 ✗ if ((ret = decode_alpha_block(s, gb, last_alpha, dest_a + 8 * linesize_a, linesize_a)) < 0)
251 ✗ return ret;
252 ✗ } else if (s->alpha_type == SHQ_DCT_ALPHA) {
253 /* Alpha encoded exactly like luma. */
254 ✗ if ((ret = decode_dct_block(s, gb, last_dc, 3, dest_a, linesize_a)) < 0)
255 ✗ return ret;
256 ✗ if ((ret = decode_dct_block(s, gb, last_dc, 3, dest_a + 8, linesize_a)) < 0)
257 ✗ return ret;
258 ✗ if ((ret = decode_dct_block(s, gb, last_dc, 3, dest_a + 8 * linesize_a, linesize_a)) < 0)
259 ✗ return ret;
260 ✗ if ((ret = decode_dct_block(s, gb, last_dc, 3, dest_a + 8 * linesize_a + 8, linesize_a)) < 0)
261 ✗ return ret;
262 }
263 }
264
265 ✗ return 0;
266 }
267
268 453 static int decode_speedhq_field(const SHQContext *s, const uint8_t *buf, int buf_size, AVFrame *frame, int field_number, int start, int end, int line_stride)
269 {
270 int ret, slice_number, slice_offsets[5];
271 453 int linesize_y = frame->linesize[0] * line_stride;
272 453 int linesize_cb = frame->linesize[1] * line_stride;
273 453 int linesize_cr = frame->linesize[2] * line_stride;
274 int linesize_a;
275 GetBitContext gb;
276
277
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 453 if (s->alpha_type != SHQ_NO_ALPHA)
278 ✗ linesize_a = frame->linesize[3] * line_stride;
279
280
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 453 if (end < start || end - start < 3 || end > buf_size)
281 ✗ return AVERROR_INVALIDDATA;
282
283 453 slice_offsets[0] = start;
284 453 slice_offsets[4] = end;
285
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 1812 for (slice_number = 1; slice_number < 4; slice_number++) {
286 uint32_t last_offset, slice_len;
287
288 1359 last_offset = slice_offsets[slice_number - 1];
289 1359 slice_len = AV_RL24(buf + last_offset);
290 1359 slice_offsets[slice_number] = last_offset + slice_len;
291
292
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 1359 if (slice_len < 3 || slice_offsets[slice_number] > end - 3)
293 ✗ return AVERROR_INVALIDDATA;
294 }
295
296
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 2265 for (slice_number = 0; slice_number < 4; slice_number++) {
297 uint32_t slice_begin, slice_end;
298 int x, y;
299
300 1812 slice_begin = slice_offsets[slice_number];
301 1812 slice_end = slice_offsets[slice_number + 1];
302
303
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 1812 if ((ret = init_get_bits8(&gb, buf + slice_begin + 3, slice_end - slice_begin - 3)) < 0)
304 ✗ return ret;
305
306
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 9918 for (y = slice_number * 16 * line_stride; y < frame->height; y += line_stride * 64) {
307 uint8_t *dest_y, *dest_cb, *dest_cr, *dest_a;
308 8106 int last_dc[4] = { 1024, 1024, 1024, 1024 };
309 uint8_t last_alpha[16];
310
311 8106 memset(last_alpha, 255, sizeof(last_alpha));
312
313 8106 dest_y = frame->data[0] + frame->linesize[0] * (y + field_number);
314
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 8106 if (s->subsampling == SHQ_SUBSAMPLING_420) {
315 2700 dest_cb = frame->data[1] + frame->linesize[1] * (y/2 + field_number);
316 2700 dest_cr = frame->data[2] + frame->linesize[2] * (y/2 + field_number);
317 } else {
318 5406 dest_cb = frame->data[1] + frame->linesize[1] * (y + field_number);
319 5406 dest_cr = frame->data[2] + frame->linesize[2] * (y + field_number);
320 }
321
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 8106 if (s->alpha_type != SHQ_NO_ALPHA) {
322 ✗ dest_a = frame->data[3] + frame->linesize[3] * (y + field_number);
323 }
324
325
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 186348 for (x = 0; x < frame->width - 8 * (s->subsampling != SHQ_SUBSAMPLING_444); x += 16) {
326 /* Decode the four luma blocks. */
327
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 178242 if ((ret = decode_dct_block(s, &gb, last_dc, 0, dest_y, linesize_y)) < 0)
328 ✗ return ret;
329
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 178242 if ((ret = decode_dct_block(s, &gb, last_dc, 0, dest_y + 8, linesize_y)) < 0)
330 ✗ return ret;
331
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 178242 if ((ret = decode_dct_block(s, &gb, last_dc, 0, dest_y + 8 * linesize_y, linesize_y)) < 0)
332 ✗ return ret;
333
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 178242 if ((ret = decode_dct_block(s, &gb, last_dc, 0, dest_y + 8 * linesize_y + 8, linesize_y)) < 0)
334 ✗ return ret;
335
336 /*
337 * Decode the first chroma block. For 4:2:0, this is the only one;
338 * for 4:2:2, it's the top block; for 4:4:4, it's the top-left block.
339 */
340
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 178242 if ((ret = decode_dct_block(s, &gb, last_dc, 1, dest_cb, linesize_cb)) < 0)
341 ✗ return ret;
342
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 178242 if ((ret = decode_dct_block(s, &gb, last_dc, 2, dest_cr, linesize_cr)) < 0)
343 ✗ return ret;
344
345
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 178242 if (s->subsampling != SHQ_SUBSAMPLING_420) {
346 /* For 4:2:2, this is the bottom block; for 4:4:4, it's the bottom-left block. */
347
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 118842 if ((ret = decode_dct_block(s, &gb, last_dc, 1, dest_cb + 8 * linesize_cb, linesize_cb)) < 0)
348 ✗ return ret;
349
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 118842 if ((ret = decode_dct_block(s, &gb, last_dc, 2, dest_cr + 8 * linesize_cr, linesize_cr)) < 0)
350 ✗ return ret;
351
352
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 118842 if (s->subsampling == SHQ_SUBSAMPLING_444) {
353 /* Top-right and bottom-right blocks. */
354
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 59400 if ((ret = decode_dct_block(s, &gb, last_dc, 1, dest_cb + 8, linesize_cb)) < 0)
355 ✗ return ret;
356
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 59400 if ((ret = decode_dct_block(s, &gb, last_dc, 2, dest_cr + 8, linesize_cr)) < 0)
357 ✗ return ret;
358
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 59400 if ((ret = decode_dct_block(s, &gb, last_dc, 1, dest_cb + 8 * linesize_cb + 8, linesize_cb)) < 0)
359 ✗ return ret;
360
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 59400 if ((ret = decode_dct_block(s, &gb, last_dc, 2, dest_cr + 8 * linesize_cr + 8, linesize_cr)) < 0)
361 ✗ return ret;
362
363 59400 dest_cb += 8;
364 59400 dest_cr += 8;
365 }
366 }
367 178242 dest_y += 16;
368 178242 dest_cb += 8;
369 178242 dest_cr += 8;
370
371
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 178242 if (s->alpha_type == SHQ_RLE_ALPHA) {
372 /* Alpha coded using 16x8 RLE blocks. */
373 ✗ if ((ret = decode_alpha_block(s, &gb, last_alpha, dest_a, linesize_a)) < 0)
374 ✗ return ret;
375 ✗ if ((ret = decode_alpha_block(s, &gb, last_alpha, dest_a + 8 * linesize_a, linesize_a)) < 0)
376 ✗ return ret;
377 ✗ dest_a += 16;
378
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 178242 } else if (s->alpha_type == SHQ_DCT_ALPHA) {
379 /* Alpha encoded exactly like luma. */
380 ✗ if ((ret = decode_dct_block(s, &gb, last_dc, 3, dest_a, linesize_a)) < 0)
381 ✗ return ret;
382 ✗ if ((ret = decode_dct_block(s, &gb, last_dc, 3, dest_a + 8, linesize_a)) < 0)
383 ✗ return ret;
384 ✗ if ((ret = decode_dct_block(s, &gb, last_dc, 3, dest_a + 8 * linesize_a, linesize_a)) < 0)
385 ✗ return ret;
386 ✗ if ((ret = decode_dct_block(s, &gb, last_dc, 3, dest_a + 8 * linesize_a + 8, linesize_a)) < 0)
387 ✗ return ret;
388 ✗ dest_a += 16;
389 }
390 }
391 }
392 }
393
394
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 453 if (s->subsampling != SHQ_SUBSAMPLING_444 && (frame->width & 15))
395 ✗ return decode_speedhq_border(s, &gb, frame, field_number, line_stride);
396
397 453 return 0;
398 }
399
400 452 static void compute_quant_matrix(int *output, int qscale)
401 {
402 int i;
403
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 29380 for (i = 0; i < 64; i++) output[i] = unscaled_quant_matrix[ff_zigzag_direct[i]] * qscale;
404 452 }
405
406 452 static int speedhq_decode_frame(AVCodecContext *avctx, AVFrame *frame,
407 int *got_frame, AVPacket *avpkt)
408 {
409 452 SHQContext * const s = avctx->priv_data;
410 452 const uint8_t *buf = avpkt->data;
411 452 int buf_size = avpkt->size;
412 uint8_t quality;
413 uint32_t second_field_offset;
414 int ret;
415
416
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 452 if (buf_size < 4 || avctx->width < 8 || avctx->width % 8 != 0)
417 ✗ return AVERROR_INVALIDDATA;
418
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 452 if (buf_size < avctx->width*avctx->height / 64 / 4)
419 ✗ return AVERROR_INVALIDDATA;
420
421 452 quality = buf[0];
422
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 452 if (quality >= 100) {
423 ✗ return AVERROR_INVALIDDATA;
424 }
425
426 452 compute_quant_matrix(s->quant_matrix, 100 - quality);
427
428 452 second_field_offset = AV_RL24(buf + 1);
429
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 452 if (second_field_offset >= buf_size - 3) {
430 ✗ return AVERROR_INVALIDDATA;
431 }
432
433 452 avctx->coded_width = FFALIGN(avctx->width, 16);
434 452 avctx->coded_height = FFALIGN(avctx->height, 16);
435
436
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 452 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
437 ✗ return ret;
438 }
439 452 frame->flags |= AV_FRAME_FLAG_KEY;
440
441
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 452 if (second_field_offset == 4 || second_field_offset == (buf_size-4)) {
442 /*
443 * Overlapping first and second fields is used to signal
444 * encoding only a single field. In this case, "height"
445 * is ambiguous; it could mean either the height of the
446 * frame as a whole, or of the field. The former would make
447 * more sense for compatibility with legacy decoders,
448 * but this matches the convention used in NDI, which is
449 * the primary user of this trick.
450 */
451
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 451 if ((ret = decode_speedhq_field(s, buf, buf_size, frame, 0, 4, buf_size, 1)) < 0)
452 ✗ return ret;
453 } else {
454
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 1 if ((ret = decode_speedhq_field(s, buf, buf_size, frame, 0, 4, second_field_offset, 2)) < 0)
455 ✗ return ret;
456
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 1 if ((ret = decode_speedhq_field(s, buf, buf_size, frame, 1, second_field_offset, buf_size, 2)) < 0)
457 ✗ return ret;
458 }
459
460 452 *got_frame = 1;
461 452 return buf_size;
462 }
463
464 /*
465 * Alpha VLC. Run and level are independently coded, and would be
466 * outside the default limits for MAX_RUN/MAX_LEVEL, so we don't
467 * bother with combining them into one table.
468 */
469 11 static av_cold void compute_alpha_vlcs(void)
470 {
471 uint16_t run_code[134], level_code[266];
472 uint8_t run_bits[134], level_bits[266];
473 int16_t run_symbols[134], level_symbols[266];
474 int entry, i, sign;
475
476 /* Initialize VLC for alpha run. */
477 11 entry = 0;
478
479 /* 0 -> 0. */
480 11 run_code[entry] = 0;
481 11 run_bits[entry] = 1;
482 11 run_symbols[entry] = 0;
483 11 ++entry;
484
485 /* 10xx -> xx plus 1. */
486
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 55 for (i = 0; i < 4; ++i) {
487 44 run_code[entry] = (i << 2) | 1;
488 44 run_bits[entry] = 4;
489 44 run_symbols[entry] = i + 1;
490 44 ++entry;
491 }
492
493 /* 111xxxxxxx -> xxxxxxx. */
494
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 1419 for (i = 0; i < 128; ++i) {
495 1408 run_code[entry] = (i << 3) | 7;
496 1408 run_bits[entry] = 10;
497 1408 run_symbols[entry] = i;
498 1408 ++entry;
499 }
500
501 /* 110 -> EOB. */
502 11 run_code[entry] = 3;
503 11 run_bits[entry] = 3;
504 11 run_symbols[entry] = -1;
505 11 ++entry;
506
507
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 11 av_assert0(entry == FF_ARRAY_ELEMS(run_code));
508
509 11 VLC_INIT_STATIC_SPARSE_TABLE(dc_alpha_run_vlc_le, ALPHA_VLC_BITS,
510 FF_ARRAY_ELEMS(run_code),
511 run_bits, 1, 1,
512 run_code, 2, 2,
513 run_symbols, 2, 2, VLC_INIT_LE);
514
515 /* Initialize VLC for alpha level. */
516 11 entry = 0;
517
518
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 33 for (sign = 0; sign <= 1; ++sign) {
519 /* 1s -> -1 or +1 (depending on sign bit). */
520 22 level_code[entry] = (sign << 1) | 1;
521 22 level_bits[entry] = 2;
522
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 22 level_symbols[entry] = sign ? -1 : 1;
523 22 ++entry;
524
525 /* 01sxx -> xx plus 2 (2..5 or -2..-5, depending on sign bit). */
526
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 110 for (i = 0; i < 4; ++i) {
527 88 level_code[entry] = (i << 3) | (sign << 2) | 2;
528 88 level_bits[entry] = 5;
529
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 88 level_symbols[entry] = sign ? -(i + 2) : (i + 2);
530 88 ++entry;
531 }
532 }
533
534 /*
535 * 00xxxxxxxx -> xxxxxxxx, in two's complement. There are many codes
536 * here that would better be encoded in other ways (e.g. 0 would be
537 * encoded by increasing run, and +/- 1 would be encoded with a
538 * shorter code), but it doesn't hurt to allow everything.
539 */
540
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 2827 for (i = 0; i < 256; ++i) {
541 2816 level_code[entry] = i << 2;
542 2816 level_bits[entry] = 10;
543 2816 level_symbols[entry] = i;
544 2816 ++entry;
545 }
546
547
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 11 av_assert0(entry == FF_ARRAY_ELEMS(level_code));
548
549 11 VLC_INIT_STATIC_SPARSE_TABLE(dc_alpha_level_vlc_le, ALPHA_VLC_BITS,
550 FF_ARRAY_ELEMS(level_code),
551 level_bits, 1, 1,
552 level_code, 2, 2,
553 level_symbols, 2, 2, VLC_INIT_LE);
554 11 }
555
556 11 static av_cold void speedhq_static_init(void)
557 {
558 /* Exactly the same as MPEG-2, except for a little-endian reader. */
559 11 VLC_INIT_STATIC_TABLE(dc_lum_vlc_le, DC_VLC_BITS, 12,
560 ff_mpeg12_vlc_dc_lum_bits, 1, 1,
561 ff_mpeg12_vlc_dc_lum_code, 2, 2,
562 VLC_INIT_OUTPUT_LE);
563 11 VLC_INIT_STATIC_TABLE(dc_chroma_vlc_le, DC_VLC_BITS, 12,
564 ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
565 ff_mpeg12_vlc_dc_chroma_code, 2, 2,
566 VLC_INIT_OUTPUT_LE);
567
568 11 ff_init_2d_vlc_rl(ff_speedhq_vlc_table, speedhq_rl_vlc, ff_speedhq_run,
569 ff_speedhq_level, SPEEDHQ_RL_NB_ELEMS,
570 FF_ARRAY_ELEMS(speedhq_rl_vlc), VLC_INIT_LE);
571
572 11 compute_alpha_vlcs();
573 11 }
574
575 22 static av_cold int speedhq_decode_init(AVCodecContext *avctx)
576 {
577 int ret;
578 static AVOnce init_once = AV_ONCE_INIT;
579 22 SHQContext * const s = avctx->priv_data;
580
581 22 ret = ff_thread_once(&init_once, speedhq_static_init);
582
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 22 if (ret)
583 ✗ return AVERROR_UNKNOWN;
584
585 22 ff_blockdsp_init(&s->bdsp);
586 22 ff_idctdsp_init(&s->idsp, avctx);
587 22 ff_permute_scantable(s->permutated_intra_scantable, ff_zigzag_direct,
588 22 s->idsp.idct_permutation);
589
590
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 22 switch (avctx->codec_tag) {
591 6 case MKTAG('S', 'H', 'Q', '0'):
592 6 s->subsampling = SHQ_SUBSAMPLING_420;
593 6 s->alpha_type = SHQ_NO_ALPHA;
594 6 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
595 6 break;
596 ✗ case MKTAG('S', 'H', 'Q', '1'):
597 ✗ s->subsampling = SHQ_SUBSAMPLING_420;
598 ✗ s->alpha_type = SHQ_RLE_ALPHA;
599 ✗ avctx->pix_fmt = AV_PIX_FMT_YUVA420P;
600 ✗ break;
601 8 case MKTAG('S', 'H', 'Q', '2'):
602 8 s->subsampling = SHQ_SUBSAMPLING_422;
603 8 s->alpha_type = SHQ_NO_ALPHA;
604 8 avctx->pix_fmt = AV_PIX_FMT_YUV422P;
605 8 break;
606 ✗ case MKTAG('S', 'H', 'Q', '3'):
607 ✗ s->subsampling = SHQ_SUBSAMPLING_422;
608 ✗ s->alpha_type = SHQ_RLE_ALPHA;
609 ✗ avctx->pix_fmt = AV_PIX_FMT_YUVA422P;
610 ✗ break;
611 6 case MKTAG('S', 'H', 'Q', '4'):
612 6 s->subsampling = SHQ_SUBSAMPLING_444;
613 6 s->alpha_type = SHQ_NO_ALPHA;
614 6 avctx->pix_fmt = AV_PIX_FMT_YUV444P;
615 6 break;
616 ✗ case MKTAG('S', 'H', 'Q', '5'):
617 ✗ s->subsampling = SHQ_SUBSAMPLING_444;
618 ✗ s->alpha_type = SHQ_RLE_ALPHA;
619 ✗ avctx->pix_fmt = AV_PIX_FMT_YUVA444P;
620 ✗ break;
621 ✗ case MKTAG('S', 'H', 'Q', '7'):
622 ✗ s->subsampling = SHQ_SUBSAMPLING_422;
623 ✗ s->alpha_type = SHQ_DCT_ALPHA;
624 ✗ avctx->pix_fmt = AV_PIX_FMT_YUVA422P;
625 ✗ break;
626 ✗ case MKTAG('S', 'H', 'Q', '9'):
627 ✗ s->subsampling = SHQ_SUBSAMPLING_444;
628 ✗ s->alpha_type = SHQ_DCT_ALPHA;
629 ✗ avctx->pix_fmt = AV_PIX_FMT_YUVA444P;
630 ✗ break;
631 2 default:
632 2 av_log(avctx, AV_LOG_ERROR, "Unknown NewTek SpeedHQ FOURCC provided (%08X)\n",
633 avctx->codec_tag);
634 2 return AVERROR_INVALIDDATA;
635 }
636
637 /* This matches what NDI's RGB -> Y'CbCr 4:2:2 converter uses. */
638 20 avctx->colorspace = AVCOL_SPC_BT470BG;
639 20 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
640
641 20 return 0;
642 }
643
644 const FFCodec ff_speedhq_decoder = {
645 .p.name = "speedhq",
646 CODEC_LONG_NAME("NewTek SpeedHQ"),
647 .p.type = AVMEDIA_TYPE_VIDEO,
648 .p.id = AV_CODEC_ID_SPEEDHQ,
649 .priv_data_size = sizeof(SHQContext),
650 .init = speedhq_decode_init,
651 FF_CODEC_DECODE_CB(speedhq_decode_frame),
652 .p.capabilities = AV_CODEC_CAP_DR1,
653 };
654