FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/smcenc.c
Date: 2022-01-28 07:56:06
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Lines: 0 293 0.0%
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1 /*
2 * QuickTime Graphics (SMC) Video Encoder
3 * Copyright (c) 2021 The FFmpeg project
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 smcenc.c
24 * QT SMC Video Encoder by Paul B. Mahol
25 */
26
27 #include "libavutil/common.h"
28
29 #include "avcodec.h"
30 #include "encode.h"
31 #include "internal.h"
32 #include "bytestream.h"
33
34 #define CPAIR 2
35 #define CQUAD 4
36 #define COCTET 8
37
38 #define COLORS_PER_TABLE 256
39
40 typedef struct SMCContext {
41 AVFrame *prev_frame; // buffer for previous source frame
42
43 uint8_t mono_value;
44 int nb_distinct;
45 int next_nb_distinct;
46 uint8_t distinct_values[16];
47 uint8_t next_distinct_values[16];
48
49 uint8_t color_pairs[COLORS_PER_TABLE][CPAIR];
50 uint8_t color_quads[COLORS_PER_TABLE][CQUAD];
51 uint8_t color_octets[COLORS_PER_TABLE][COCTET];
52
53 int key_frame;
54 } SMCContext;
55
56 #define ADVANCE_BLOCK(pixel_ptr, row_ptr, nb_blocks) \
57 { \
58 for (int block = 0; block < nb_blocks && pixel_ptr && row_ptr; block++) { \
59 pixel_ptr += 4; \
60 if (pixel_ptr - row_ptr >= width) \
61 { \
62 row_ptr += stride * 4; \
63 pixel_ptr = row_ptr; \
64 } \
65 } \
66 }
67
68 ✗ static int smc_cmp_values(const void *a, const void *b)
69 {
70 ✗ const uint8_t *aa = a, *bb = b;
71
72 ✗ return FFDIFFSIGN(aa[0], bb[0]);
73 }
74
75 ✗ static int count_distinct_items(const uint8_t *block_values,
76 uint8_t *distinct_values,
77 int size)
78 {
79 ✗ int n = 1;
80
81 ✗ distinct_values[0] = block_values[0];
82 ✗ for (int i = 1; i < size; i++) {
83 ✗ if (block_values[i] != block_values[i-1]) {
84 ✗ distinct_values[n] = block_values[i];
85 ✗ n++;
86 }
87 }
88
89 ✗ return n;
90 }
91
92 #define CACHE_PAIR(x) \
93 (s->color_pairs[i][0] == distinct_values[x] || \
94 s->color_pairs[i][1] == distinct_values[x])
95
96 #define CACHE_QUAD(x) \
97 (s->color_quads[i][0] == distinct_values[x] || \
98 s->color_quads[i][1] == distinct_values[x] || \
99 s->color_quads[i][2] == distinct_values[x] || \
100 s->color_quads[i][3] == distinct_values[x])
101
102 #define CACHE_OCTET(x) \
103 (s->color_octets[i][0] == distinct_values[x] || \
104 s->color_octets[i][1] == distinct_values[x] || \
105 s->color_octets[i][2] == distinct_values[x] || \
106 s->color_octets[i][3] == distinct_values[x] || \
107 s->color_octets[i][4] == distinct_values[x] || \
108 s->color_octets[i][5] == distinct_values[x] || \
109 s->color_octets[i][6] == distinct_values[x] || \
110 s->color_octets[i][7] == distinct_values[x])
111
112 ✗ static void smc_encode_stream(SMCContext *s, const AVFrame *frame,
113 PutByteContext *pb)
114 {
115 ✗ const uint8_t *src_pixels = (const uint8_t *)frame->data[0];
116 ✗ const int stride = frame->linesize[0];
117 ✗ const uint8_t *prev_pixels = (const uint8_t *)s->prev_frame->data[0];
118 ✗ uint8_t *distinct_values = s->distinct_values;
119 const uint8_t *pixel_ptr, *row_ptr;
120 ✗ const int width = frame->width;
121 uint8_t block_values[16];
122 ✗ int block_counter = 0;
123 ✗ int color_pair_index = 0;
124 ✗ int color_quad_index = 0;
125 ✗ int color_octet_index = 0;
126 int color_table_index; /* indexes to color pair, quad, or octet tables */
127 int total_blocks;
128
129 ✗ memset(s->color_pairs, 0, sizeof(s->color_pairs));
130 ✗ memset(s->color_quads, 0, sizeof(s->color_quads));
131 ✗ memset(s->color_octets, 0, sizeof(s->color_octets));
132
133 /* Number of 4x4 blocks in frame. */
134 ✗ total_blocks = ((frame->width + 3) / 4) * ((frame->height + 3) / 4);
135
136 ✗ pixel_ptr = row_ptr = src_pixels;
137
138 ✗ while (block_counter < total_blocks) {
139 ✗ const uint8_t *xpixel_ptr = pixel_ptr;
140 ✗ const uint8_t *xrow_ptr = row_ptr;
141 ✗ int intra_skip_blocks = 0;
142 ✗ int inter_skip_blocks = 0;
143 ✗ int coded_distinct = 0;
144 ✗ int coded_blocks = 0;
145 int cache_index;
146 ✗ int distinct = 0;
147 ✗ int blocks = 0;
148
149 ✗ while (prev_pixels && s->key_frame == 0 && block_counter + inter_skip_blocks < total_blocks) {
150 ✗ int compare = 0;
151
152 ✗ for (int y = 0; y < 4; y++) {
153 ✗ const ptrdiff_t offset = pixel_ptr - src_pixels;
154 ✗ const uint8_t *prev_pixel_ptr = prev_pixels + offset;
155
156 ✗ compare |= memcmp(prev_pixel_ptr + y * stride, pixel_ptr + y * stride, 4);
157 ✗ if (compare)
158 ✗ break;
159 }
160
161 ✗ if (compare)
162 ✗ break;
163
164 ✗ if (inter_skip_blocks >= 256)
165 ✗ break;
166 ✗ inter_skip_blocks++;
167
168 ✗ ADVANCE_BLOCK(pixel_ptr, row_ptr, 1)
169 }
170
171 ✗ pixel_ptr = xpixel_ptr;
172 ✗ row_ptr = xrow_ptr;
173
174 ✗ while (block_counter > 0 && block_counter + intra_skip_blocks < total_blocks) {
175 ✗ const ptrdiff_t offset = pixel_ptr - src_pixels;
176 ✗ const int sy = offset / stride;
177 ✗ const int sx = offset % stride;
178 ✗ const int ny = sx < 4 ? sy - 4 : sy;
179 ✗ const int nx = sx < 4 ? width - 4 : sx - 4;
180 ✗ const uint8_t *old_pixel_ptr = src_pixels + nx + ny * stride;
181 ✗ int compare = 0;
182
183 ✗ for (int y = 0; y < 4; y++) {
184 ✗ compare |= memcmp(old_pixel_ptr + y * stride, pixel_ptr + y * stride, 4);
185 ✗ if (compare)
186 ✗ break;
187 }
188
189 ✗ if (compare)
190 ✗ break;
191
192 ✗ if (intra_skip_blocks >= 256)
193 ✗ break;
194 ✗ intra_skip_blocks++;
195 ✗ ADVANCE_BLOCK(pixel_ptr, row_ptr, 1)
196 }
197
198 ✗ pixel_ptr = xpixel_ptr;
199 ✗ row_ptr = xrow_ptr;
200
201 ✗ while (block_counter + coded_blocks < total_blocks && coded_blocks < 256) {
202 ✗ for (int y = 0; y < 4; y++)
203 ✗ memcpy(block_values + y * 4, pixel_ptr + y * stride, 4);
204
205 ✗ qsort(block_values, 16, sizeof(block_values[0]), smc_cmp_values);
206 ✗ s->next_nb_distinct = count_distinct_items(block_values, s->next_distinct_values, 16);
207 ✗ if (coded_blocks == 0) {
208 ✗ memcpy(distinct_values, s->next_distinct_values, sizeof(s->distinct_values));
209 ✗ s->nb_distinct = s->next_nb_distinct;
210 } else {
211 ✗ if (s->next_nb_distinct != s->nb_distinct ||
212 ✗ memcmp(distinct_values, s->next_distinct_values, s->nb_distinct)) {
213 break;
214 }
215 }
216 ✗ s->mono_value = block_values[0];
217
218 ✗ coded_distinct = s->nb_distinct;
219 ✗ ADVANCE_BLOCK(pixel_ptr, row_ptr, 1)
220 ✗ coded_blocks++;
221 ✗ if (coded_distinct > 1 && coded_blocks >= 16)
222 ✗ break;
223 }
224
225 ✗ pixel_ptr = xpixel_ptr;
226 ✗ row_ptr = xrow_ptr;
227
228 ✗ blocks = coded_blocks;
229 ✗ distinct = coded_distinct;
230
231 ✗ if (intra_skip_blocks > 0 && intra_skip_blocks >= inter_skip_blocks &&
232 intra_skip_blocks > 0) {
233 ✗ distinct = 17;
234 ✗ blocks = intra_skip_blocks;
235 }
236
237 ✗ if (intra_skip_blocks > 16 && intra_skip_blocks >= inter_skip_blocks &&
238 intra_skip_blocks > 0) {
239 ✗ distinct = 18;
240 ✗ blocks = intra_skip_blocks;
241 }
242
243 ✗ if (inter_skip_blocks > 0 && inter_skip_blocks > intra_skip_blocks &&
244 inter_skip_blocks > 0) {
245 ✗ distinct = 19;
246 ✗ blocks = inter_skip_blocks;
247 }
248
249 ✗ if (inter_skip_blocks > 16 && inter_skip_blocks > intra_skip_blocks &&
250 inter_skip_blocks > 0) {
251 ✗ distinct = 20;
252 ✗ blocks = inter_skip_blocks;
253 }
254
255 ✗ switch (distinct) {
256 ✗ case 1:
257 ✗ if (blocks <= 16) {
258 ✗ bytestream2_put_byte(pb, 0x60 | (blocks - 1));
259 } else {
260 ✗ bytestream2_put_byte(pb, 0x70);
261 ✗ bytestream2_put_byte(pb, blocks - 1);
262 }
263 ✗ bytestream2_put_byte(pb, s->mono_value);
264 ✗ ADVANCE_BLOCK(pixel_ptr, row_ptr, blocks)
265 ✗ break;
266 ✗ case 2:
267 ✗ cache_index = -1;
268 ✗ for (int i = 0; i < COLORS_PER_TABLE; i++) {
269 ✗ if (CACHE_PAIR(0) &&
270 ✗ CACHE_PAIR(1)) {
271 ✗ cache_index = i;
272 ✗ break;
273 }
274 }
275
276 ✗ if (cache_index >= 0) {
277 ✗ bytestream2_put_byte(pb, 0x90 | (blocks - 1));
278 ✗ bytestream2_put_byte(pb, cache_index);
279 ✗ color_table_index = cache_index;
280 } else {
281 ✗ bytestream2_put_byte(pb, 0x80 | (blocks - 1));
282
283 ✗ color_table_index = color_pair_index;
284 ✗ for (int i = 0; i < CPAIR; i++) {
285 ✗ s->color_pairs[color_table_index][i] = distinct_values[i];
286 ✗ bytestream2_put_byte(pb, distinct_values[i]);
287 }
288
289 ✗ color_pair_index++;
290 ✗ if (color_pair_index == COLORS_PER_TABLE)
291 ✗ color_pair_index = 0;
292 }
293
294 ✗ for (int i = 0; i < blocks; i++) {
295 ✗ uint8_t value = s->color_pairs[color_table_index][1];
296 ✗ uint16_t flags = 0;
297 ✗ int shift = 15;
298
299 ✗ for (int y = 0; y < 4; y++) {
300 ✗ for (int x = 0; x < 4; x++) {
301 ✗ flags |= (value == pixel_ptr[x + y * stride]) << shift;
302 ✗ shift--;
303 }
304 }
305
306 ✗ bytestream2_put_be16(pb, flags);
307
308 ✗ ADVANCE_BLOCK(pixel_ptr, row_ptr, 1)
309 }
310 ✗ break;
311 ✗ case 3:
312 case 4:
313 ✗ cache_index = -1;
314 ✗ for (int i = 0; i < COLORS_PER_TABLE; i++) {
315 ✗ if (CACHE_QUAD(0) &&
316 ✗ CACHE_QUAD(1) &&
317 ✗ CACHE_QUAD(2) &&
318 ✗ CACHE_QUAD(3)) {
319 ✗ cache_index = i;
320 ✗ break;
321 }
322 }
323
324 ✗ if (cache_index >= 0) {
325 ✗ bytestream2_put_byte(pb, 0xB0 | (blocks - 1));
326 ✗ bytestream2_put_byte(pb, cache_index);
327 ✗ color_table_index = cache_index;
328 } else {
329 ✗ bytestream2_put_byte(pb, 0xA0 | (blocks - 1));
330
331 ✗ color_table_index = color_quad_index;
332 ✗ for (int i = 0; i < CQUAD; i++) {
333 ✗ s->color_quads[color_table_index][i] = distinct_values[i];
334 ✗ bytestream2_put_byte(pb, distinct_values[i]);
335 }
336
337 ✗ color_quad_index++;
338 ✗ if (color_quad_index == COLORS_PER_TABLE)
339 ✗ color_quad_index = 0;
340 }
341
342 ✗ for (int i = 0; i < blocks; i++) {
343 ✗ uint32_t flags = 0;
344 uint8_t quad[4];
345 ✗ int shift = 30;
346
347 ✗ for (int k = 0; k < 4; k++)
348 ✗ quad[k] = s->color_quads[color_table_index][k];
349
350 ✗ for (int y = 0; y < 4; y++) {
351 ✗ for (int x = 0; x < 4; x++) {
352 ✗ int pixel = pixel_ptr[x + y * stride];
353 ✗ uint32_t idx = 0;
354
355 ✗ for (int w = 0; w < CQUAD; w++) {
356 ✗ if (quad[w] == pixel) {
357 ✗ idx = w;
358 ✗ break;
359 }
360 }
361
362 ✗ flags |= idx << shift;
363 ✗ shift -= 2;
364 }
365 }
366
367 ✗ bytestream2_put_be32(pb, flags);
368
369 ✗ ADVANCE_BLOCK(pixel_ptr, row_ptr, 1)
370 }
371 ✗ break;
372 ✗ case 5:
373 case 6:
374 case 7:
375 case 8:
376 ✗ cache_index = -1;
377 ✗ for (int i = 0; i < COLORS_PER_TABLE; i++) {
378 ✗ if (CACHE_OCTET(0) &&
379 ✗ CACHE_OCTET(1) &&
380 ✗ CACHE_OCTET(2) &&
381 ✗ CACHE_OCTET(3) &&
382 ✗ CACHE_OCTET(4) &&
383 ✗ CACHE_OCTET(5) &&
384 ✗ CACHE_OCTET(6) &&
385 ✗ CACHE_OCTET(7)) {
386 ✗ cache_index = i;
387 ✗ break;
388 }
389 }
390
391 ✗ if (cache_index >= 0) {
392 ✗ bytestream2_put_byte(pb, 0xD0 | (blocks - 1));
393 ✗ bytestream2_put_byte(pb, cache_index);
394 ✗ color_table_index = cache_index;
395 } else {
396 ✗ bytestream2_put_byte(pb, 0xC0 | (blocks - 1));
397
398 ✗ color_table_index = color_octet_index;
399 ✗ for (int i = 0; i < COCTET; i++) {
400 ✗ s->color_octets[color_table_index][i] = distinct_values[i];
401 ✗ bytestream2_put_byte(pb, distinct_values[i]);
402 }
403
404 ✗ color_octet_index++;
405 ✗ if (color_octet_index == COLORS_PER_TABLE)
406 ✗ color_octet_index = 0;
407 }
408
409 ✗ for (int i = 0; i < blocks; i++) {
410 ✗ uint64_t flags = 0;
411 uint8_t octet[8];
412 ✗ int shift = 45;
413
414 ✗ for (int k = 0; k < 8; k++)
415 ✗ octet[k] = s->color_octets[color_table_index][k];
416
417 ✗ for (int y = 0; y < 4; y++) {
418 ✗ for (int x = 0; x < 4; x++) {
419 ✗ int pixel = pixel_ptr[x + y * stride];
420 ✗ uint64_t idx = 0;
421
422 ✗ for (int w = 0; w < COCTET; w++) {
423 ✗ if (octet[w] == pixel) {
424 ✗ idx = w;
425 ✗ break;
426 }
427 }
428
429 ✗ flags |= idx << shift;
430 ✗ shift -= 3;
431 }
432 }
433
434 ✗ bytestream2_put_be16(pb, ((flags >> 32) & 0xFFF0) | ((flags >> 8) & 0xF));
435 ✗ bytestream2_put_be16(pb, ((flags >> 20) & 0xFFF0) | ((flags >> 4) & 0xF));
436 ✗ bytestream2_put_be16(pb, ((flags >> 8) & 0xFFF0) | ((flags >> 0) & 0xF));
437
438 ✗ ADVANCE_BLOCK(pixel_ptr, row_ptr, 1)
439 }
440 ✗ break;
441 ✗ default:
442 ✗ bytestream2_put_byte(pb, 0xE0 | (blocks - 1));
443 ✗ for (int i = 0; i < blocks; i++) {
444 ✗ for (int y = 0; y < 4; y++) {
445 ✗ for (int x = 0; x < 4; x++)
446 ✗ bytestream2_put_byte(pb, pixel_ptr[x + y * stride]);
447 }
448
449 ✗ ADVANCE_BLOCK(pixel_ptr, row_ptr, 1)
450 }
451 ✗ break;
452 ✗ case 17:
453 ✗ bytestream2_put_byte(pb, 0x20 | (blocks - 1));
454 ✗ ADVANCE_BLOCK(pixel_ptr, row_ptr, blocks)
455 ✗ break;
456 ✗ case 18:
457 ✗ bytestream2_put_byte(pb, 0x30);
458 ✗ bytestream2_put_byte(pb, blocks - 1);
459 ✗ ADVANCE_BLOCK(pixel_ptr, row_ptr, blocks)
460 ✗ break;
461 ✗ case 19:
462 ✗ bytestream2_put_byte(pb, 0x00 | (blocks - 1));
463 ✗ ADVANCE_BLOCK(pixel_ptr, row_ptr, blocks)
464 ✗ break;
465 ✗ case 20:
466 ✗ bytestream2_put_byte(pb, 0x10);
467 ✗ bytestream2_put_byte(pb, blocks - 1);
468 ✗ ADVANCE_BLOCK(pixel_ptr, row_ptr, blocks)
469 ✗ break;
470 }
471
472 ✗ block_counter += blocks;
473 }
474 }
475
476 ✗ static int smc_encode_init(AVCodecContext *avctx)
477 {
478 ✗ SMCContext *s = avctx->priv_data;
479
480 ✗ avctx->bits_per_coded_sample = 8;
481
482 ✗ s->prev_frame = av_frame_alloc();
483 ✗ if (!s->prev_frame)
484 ✗ return AVERROR(ENOMEM);
485
486 ✗ return 0;
487 }
488
489 ✗ static int smc_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
490 const AVFrame *frame, int *got_packet)
491 {
492 ✗ SMCContext *s = avctx->priv_data;
493 ✗ const AVFrame *pict = frame;
494 PutByteContext pb;
495 uint8_t *pal;
496 int ret;
497
498 ✗ ret = ff_alloc_packet(avctx, pkt, 8LL * avctx->height * avctx->width);
499 ✗ if (ret < 0)
500 ✗ return ret;
501
502 ✗ if (avctx->gop_size == 0 || !s->prev_frame->data[0] ||
503 ✗ (avctx->frame_number % avctx->gop_size) == 0) {
504 ✗ s->key_frame = 1;
505 } else {
506 ✗ s->key_frame = 0;
507 }
508
509 ✗ bytestream2_init_writer(&pb, pkt->data, pkt->size);
510
511 ✗ bytestream2_put_be32(&pb, 0x00);
512
513 ✗ pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
514 ✗ if (!pal)
515 ✗ return AVERROR(ENOMEM);
516 ✗ memcpy(pal, frame->data[1], AVPALETTE_SIZE);
517
518 ✗ smc_encode_stream(s, pict, &pb);
519
520 ✗ av_shrink_packet(pkt, bytestream2_tell_p(&pb));
521
522 ✗ pkt->data[0] = 0x0;
523
524 // write chunk length
525 ✗ AV_WB24(pkt->data + 1, pkt->size);
526
527 ✗ av_frame_unref(s->prev_frame);
528 ✗ ret = av_frame_ref(s->prev_frame, frame);
529 ✗ if (ret < 0) {
530 ✗ av_log(avctx, AV_LOG_ERROR, "cannot add reference\n");
531 ✗ return ret;
532 }
533
534 ✗ if (s->key_frame)
535 ✗ pkt->flags |= AV_PKT_FLAG_KEY;
536
537 ✗ *got_packet = 1;
538
539 ✗ return 0;
540 }
541
542 ✗ static int smc_encode_end(AVCodecContext *avctx)
543 {
544 ✗ SMCContext *s = (SMCContext *)avctx->priv_data;
545
546 ✗ av_frame_free(&s->prev_frame);
547
548 ✗ return 0;
549 }
550
551 const AVCodec ff_smc_encoder = {
552 .name = "smc",
553 .long_name = NULL_IF_CONFIG_SMALL("QuickTime Graphics (SMC)"),
554 .type = AVMEDIA_TYPE_VIDEO,
555 .id = AV_CODEC_ID_SMC,
556 .priv_data_size = sizeof(SMCContext),
557 .init = smc_encode_init,
558 .encode2 = smc_encode_frame,
559 .close = smc_encode_end,
560 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
561 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_PAL8,
562 AV_PIX_FMT_NONE},
563 };
564