FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/fic.c
Date: 2026-01-23 19:11:46
Exec Total Coverage
Lines: 198 232 85.3%
Functions: 9 9 100.0%
Branches: 92 122 75.4%
Line Branch Exec Source
1 /*
2 * Mirillis FIC decoder
3 *
4 * Copyright (c) 2014 Konstantin Shishkov
5 * Copyright (c) 2014 Derek Buitenhuis
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24 #include "libavutil/common.h"
25 #include "libavutil/mem.h"
26 #include "libavutil/mem_internal.h"
27 #include "libavutil/opt.h"
28 #include "avcodec.h"
29 #include "codec_internal.h"
30 #include "decode.h"
31 #include "get_bits.h"
32 #include "golomb.h"
33
34 typedef struct FICThreadContext {
35 DECLARE_ALIGNED(16, int16_t, block)[64];
36 const uint8_t *src;
37 int slice_h;
38 int src_size;
39 int y_off;
40 int p_frame;
41 } FICThreadContext;
42
43 typedef struct FICContext {
44 AVClass *class;
45 AVCodecContext *avctx;
46 AVFrame *frame;
47 AVFrame *final_frame;
48
49 FICThreadContext *slice_data;
50 int slice_data_size;
51
52 const uint8_t *qmat;
53
54 enum AVPictureType cur_frame_type;
55
56 int aligned_width, aligned_height;
57 int num_slices, slice_h;
58
59 int skip_cursor;
60 } FICContext;
61
62 static const uint8_t fic_qmat_hq[64] = {
63 1, 2, 2, 2, 3, 3, 3, 4,
64 2, 2, 2, 3, 3, 3, 4, 4,
65 2, 2, 3, 3, 3, 4, 4, 4,
66 2, 2, 3, 3, 3, 4, 4, 5,
67 2, 3, 3, 3, 4, 4, 5, 6,
68 3, 3, 3, 4, 4, 5, 6, 7,
69 3, 3, 3, 4, 4, 5, 7, 7,
70 3, 3, 4, 4, 5, 7, 7, 7,
71 };
72
73 static const uint8_t fic_qmat_lq[64] = {
74 1, 5, 6, 7, 8, 9, 9, 11,
75 5, 5, 7, 8, 9, 9, 11, 12,
76 6, 7, 8, 9, 9, 11, 11, 12,
77 7, 7, 8, 9, 9, 11, 12, 13,
78 7, 8, 9, 9, 10, 11, 13, 16,
79 8, 9, 9, 10, 11, 13, 16, 19,
80 8, 9, 9, 11, 12, 15, 18, 23,
81 9, 9, 11, 12, 15, 18, 23, 27
82 };
83
84 static const uint8_t fic_header[7] = { 0, 0, 1, 'F', 'I', 'C', 'V' };
85
86 #define FIC_HEADER_SIZE 27
87 #define CURSOR_OFFSET 59
88 #define CURSOR_SIZE 4096
89
90 2061536 static av_always_inline void fic_idct(int16_t *blk, int step, int shift, int rnd)
91 {
92 2061536 const unsigned t0 = 27246 * blk[3 * step] + 18405 * blk[5 * step];
93 2061536 const unsigned t1 = 27246 * blk[5 * step] - 18405 * blk[3 * step];
94 2061536 const unsigned t2 = 6393 * blk[7 * step] + 32139 * blk[1 * step];
95 2061536 const unsigned t3 = 6393 * blk[1 * step] - 32139 * blk[7 * step];
96 2061536 const unsigned t4 = 5793U * ((int)(t2 + t0 + 0x800) >> 12);
97 2061536 const unsigned t5 = 5793U * ((int)(t3 + t1 + 0x800) >> 12);
98 2061536 const unsigned t6 = t2 - t0;
99 2061536 const unsigned t7 = t3 - t1;
100 2061536 const unsigned t8 = 17734 * blk[2 * step] - 42813 * blk[6 * step];
101 2061536 const unsigned t9 = 17734 * blk[6 * step] + 42814 * blk[2 * step];
102 2061536 const unsigned tA = (blk[0 * step] - blk[4 * step]) * 32768 + rnd;
103 2061536 const unsigned tB = (blk[0 * step] + blk[4 * step]) * 32768 + rnd;
104 2061536 blk[0 * step] = (int)( t4 + t9 + tB) >> shift;
105 2061536 blk[1 * step] = (int)( t6 + t7 + t8 + tA) >> shift;
106 2061536 blk[2 * step] = (int)( t6 - t7 - t8 + tA) >> shift;
107 2061536 blk[3 * step] = (int)( t5 - t9 + tB) >> shift;
108 2061536 blk[4 * step] = (int)( -t5 - t9 + tB) >> shift;
109 2061536 blk[5 * step] = (int)(-(t6 - t7) - t8 + tA) >> shift;
110 2061536 blk[6 * step] = (int)(-(t6 + t7) + t8 + tA) >> shift;
111 2061536 blk[7 * step] = (int)( -t4 + t9 + tB) >> shift;
112 2061536 }
113
114 128846 static void fic_idct_put(uint8_t *dst, int stride, int16_t *block)
115 {
116 int i, j;
117 int16_t *ptr;
118
119 128846 ptr = block;
120 128846 fic_idct(ptr++, 8, 13, (1 << 12) + (1 << 17));
121
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 1030768 for (i = 1; i < 8; i++) {
122 901922 fic_idct(ptr, 8, 13, 1 << 12);
123 901922 ptr++;
124 }
125
126 128846 ptr = block;
127
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 1159614 for (i = 0; i < 8; i++) {
128 1030768 fic_idct(ptr, 1, 20, 0);
129 1030768 ptr += 8;
130 }
131
132 128846 ptr = block;
133
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 1159614 for (j = 0; j < 8; j++) {
134
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 9276912 for (i = 0; i < 8; i++)
135 8246144 dst[i] = av_clip_uint8(ptr[i]);
136 1030768 dst += stride;
137 1030768 ptr += 8;
138 }
139 128846 }
140 1077100 static int fic_decode_block(FICContext *ctx, GetBitContext *gb,
141 uint8_t *dst, int stride, int16_t *block, int *is_p)
142 {
143 int i, num_coeff;
144
145
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 1077100 if (get_bits_left(gb) < 8)
146 6 return AVERROR_INVALIDDATA;
147
148 /* Is it a skip block? */
149
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 1077094 if (get_bits1(gb)) {
150 948248 *is_p = 1;
151 948248 return 0;
152 }
153
154 128846 memset(block, 0, sizeof(*block) * 64);
155
156 128846 num_coeff = get_bits(gb, 7);
157
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 128846 if (num_coeff > 64)
158 ✗ return AVERROR_INVALIDDATA;
159
160
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 2378622 for (i = 0; i < num_coeff; i++) {
161 2249776 int v = get_se_golomb(gb);
162
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 2249776 if (v < -2048 || v > 2048)
163 ✗ return AVERROR_INVALIDDATA;
164 2249776 block[ff_zigzag_direct[i]] = v *
165 2249776 ctx->qmat[ff_zigzag_direct[i]];
166 }
167
168 128846 fic_idct_put(dst, stride, block);
169
170 128846 return 0;
171 }
172
173 184 static int fic_decode_slice(AVCodecContext *avctx, void *tdata)
174 {
175 184 FICContext *ctx = avctx->priv_data;
176 184 FICThreadContext *tctx = tdata;
177 GetBitContext gb;
178 184 const uint8_t *src = tctx->src;
179 184 int slice_h = tctx->slice_h;
180 184 int src_size = tctx->src_size;
181 184 int y_off = tctx->y_off;
182 int x, y, p, ret;
183
184 184 ret = init_get_bits8(&gb, src, src_size);
185
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 184 if (ret < 0)
186 8 return ret;
187
188
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 698 for (p = 0; p < 3; p++) {
189 528 int stride = ctx->frame->linesize[p];
190 528 uint8_t* dst = ctx->frame->data[p] + (y_off >> !!p) * stride;
191
192
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 8970 for (y = 0; y < (slice_h >> !!p); y += 8) {
193
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 1085542 for (x = 0; x < (ctx->aligned_width >> !!p); x += 8) {
194 int ret;
195
196
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 1077100 if ((ret = fic_decode_block(ctx, &gb, dst + x, stride,
197 1077100 tctx->block, &tctx->p_frame)) != 0)
198 6 return ret;
199 }
200
201 8442 dst += 8 * stride;
202 }
203 }
204
205 170 return 0;
206 }
207
208 1472 static av_always_inline void fic_alpha_blend(uint8_t *dst, uint8_t *src,
209 int size, uint8_t *alpha)
210 {
211 int i;
212
213
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 36800 for (i = 0; i < size; i++)
214 35328 dst[i] += ((src[i] - dst[i]) * alpha[i]) >> 8;
215 1472 }
216
217 23 static void fic_draw_cursor(AVCodecContext *avctx, const uint8_t cursor_buf[CURSOR_SIZE],
218 int cur_x, int cur_y)
219 {
220 23 FICContext *ctx = avctx->priv_data;
221 23 const uint8_t *ptr = cursor_buf;
222 uint8_t *dstptr[3];
223 uint8_t planes[4][1024];
224 uint8_t chroma[3][256];
225 int i, j, p;
226
227 /* Convert to YUVA444. */
228
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 23575 for (i = 0; i < 1024; i++) {
229 23552 planes[0][i] = (( 25 * ptr[0] + 129 * ptr[1] + 66 * ptr[2]) / 255) + 16;
230 23552 planes[1][i] = ((-38 * ptr[0] + 112 * ptr[1] + -74 * ptr[2]) / 255) + 128;
231 23552 planes[2][i] = ((-18 * ptr[0] + 112 * ptr[1] + -94 * ptr[2]) / 255) + 128;
232 23552 planes[3][i] = ptr[3];
233
234 23552 ptr += 4;
235 }
236
237 /* Subsample chroma. */
238
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 391 for (i = 0; i < 32; i += 2)
239
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 6256 for (j = 0; j < 32; j += 2)
240
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 23552 for (p = 0; p < 3; p++)
241 17664 chroma[p][16 * (i / 2) + j / 2] = (planes[p + 1][32 * i + j ] +
242 17664 planes[p + 1][32 * i + j + 1] +
243 17664 planes[p + 1][32 * (i + 1) + j ] +
244 17664 planes[p + 1][32 * (i + 1) + j + 1]) / 4;
245
246 /* Seek to x/y pos of cursor. */
247
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 92 for (i = 0; i < 3; i++)
248 69 dstptr[i] = ctx->final_frame->data[i] +
249 69 (ctx->final_frame->linesize[i] * (cur_y >> !!i)) +
250 69 (cur_x >> !!i) + !!i;
251
252 /* Copy. */
253
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 391 for (i = 0; i < FFMIN(32, avctx->height - cur_y) - 1; i += 2) {
254 368 int lsize = FFMIN(32, avctx->width - cur_x);
255 368 int csize = lsize / 2;
256
257 368 fic_alpha_blend(dstptr[0],
258 368 planes[0] + i * 32, lsize, planes[3] + i * 32);
259 368 fic_alpha_blend(dstptr[0] + ctx->final_frame->linesize[0],
260 368 planes[0] + (i + 1) * 32, lsize, planes[3] + (i + 1) * 32);
261 368 fic_alpha_blend(dstptr[1],
262 368 chroma[0] + (i / 2) * 16, csize, chroma[2] + (i / 2) * 16);
263 368 fic_alpha_blend(dstptr[2],
264 368 chroma[1] + (i / 2) * 16, csize, chroma[2] + (i / 2) * 16);
265
266 368 dstptr[0] += ctx->final_frame->linesize[0] * 2;
267 368 dstptr[1] += ctx->final_frame->linesize[1];
268 368 dstptr[2] += ctx->final_frame->linesize[2];
269 }
270 23 }
271
272 242 static int fic_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
273 int *got_frame, AVPacket *avpkt)
274 {
275 242 FICContext *ctx = avctx->priv_data;
276 242 const uint8_t *src = avpkt->data;
277 int ret;
278 int slice, nslices;
279 int msize;
280 int tsize;
281 int cur_x, cur_y;
282 242 int skip_cursor = ctx->skip_cursor;
283 const uint8_t *sdata;
284
285 /* Header + at least one slice (4) */
286
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 242 if (avpkt->size < FIC_HEADER_SIZE + 4) {
287 ✗ av_log(avctx, AV_LOG_ERROR, "Frame data is too small.\n");
288 ✗ return AVERROR_INVALIDDATA;
289 }
290
291 /* Check for header. */
292
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 242 if (memcmp(src, fic_header, 7))
293 ✗ av_log(avctx, AV_LOG_WARNING, "Invalid FIC Header.\n");
294
295 /* Is it a skip frame? */
296
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 242 if (src[17]) {
297
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 196 if (!ctx->final_frame->data[0]) {
298 ✗ av_log(avctx, AV_LOG_WARNING, "Initial frame is skipped\n");
299 ✗ return AVERROR_INVALIDDATA;
300 }
301 196 ret = ff_reget_buffer(avctx, ctx->final_frame,
302 FF_REGET_BUFFER_FLAG_READONLY);
303
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 196 if (ret < 0)
304 ✗ return ret;
305 196 goto skip;
306 }
307
308 46 nslices = src[13];
309
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 46 if (!nslices) {
310 ✗ av_log(avctx, AV_LOG_ERROR, "Zero slices found.\n");
311 ✗ return AVERROR_INVALIDDATA;
312 }
313
314 /* High or Low Quality Matrix? */
315
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 46 ctx->qmat = src[23] ? fic_qmat_hq : fic_qmat_lq;
316
317 /* Skip cursor data. */
318 46 tsize = AV_RB24(src + 24);
319
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 46 if (tsize > avpkt->size - FIC_HEADER_SIZE) {
320 ✗ av_log(avctx, AV_LOG_ERROR,
321 "Packet is too small to contain cursor (%d vs %d bytes).\n",
322 ✗ tsize, avpkt->size - FIC_HEADER_SIZE);
323 ✗ return AVERROR_INVALIDDATA;
324 }
325
326
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 46 if (!tsize || !AV_RL16(src + 37) || !AV_RL16(src + 39))
327 ✗ skip_cursor = 1;
328
329
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 46 if (!skip_cursor && tsize < 32) {
330 ✗ av_log(avctx, AV_LOG_WARNING,
331 "Cursor data too small. Skipping cursor.\n");
332 ✗ skip_cursor = 1;
333 }
334
335 /* Cursor position. */
336 46 cur_x = AV_RL16(src + 33);
337 46 cur_y = AV_RL16(src + 35);
338
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 46 if (!skip_cursor && (cur_x > avctx->width || cur_y > avctx->height)) {
339 ✗ av_log(avctx, AV_LOG_DEBUG,
340 "Invalid cursor position: (%d,%d). Skipping cursor.\n",
341 cur_x, cur_y);
342 ✗ skip_cursor = 1;
343 }
344
345
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 46 if (!skip_cursor && (AV_RL16(src + 37) != 32 || AV_RL16(src + 39) != 32)) {
346 ✗ av_log(avctx, AV_LOG_WARNING,
347 "Invalid cursor size. Skipping cursor.\n");
348 ✗ skip_cursor = 1;
349 }
350
351
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 46 if (!skip_cursor && avpkt->size < CURSOR_OFFSET + CURSOR_SIZE)
352 ✗ skip_cursor = 1;
353
354 /* Slice height for all but the last slice. */
355 46 ctx->slice_h = 16 * (ctx->aligned_height >> 4) / nslices;
356
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 46 if (ctx->slice_h % 16)
357 ✗ ctx->slice_h = FFALIGN(ctx->slice_h - 16, 16);
358
359 /* First slice offset and remaining data. */
360 46 sdata = src + tsize + FIC_HEADER_SIZE + 4 * nslices;
361 46 msize = avpkt->size - nslices * 4 - tsize - FIC_HEADER_SIZE;
362
363
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 46 if (msize <= ctx->aligned_width/8 * (ctx->aligned_height/8) / 8) {
364 ✗ av_log(avctx, AV_LOG_ERROR, "Not enough frame data to decode.\n");
365 ✗ return AVERROR_INVALIDDATA;
366 }
367
368 /* Allocate slice data. */
369 46 av_fast_malloc(&ctx->slice_data, &ctx->slice_data_size,
370 nslices * sizeof(ctx->slice_data[0]));
371
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 46 if (!ctx->slice_data_size) {
372 ✗ av_log(avctx, AV_LOG_ERROR, "Could not allocate slice data.\n");
373 ✗ return AVERROR(ENOMEM);
374 }
375 46 memset(ctx->slice_data, 0, nslices * sizeof(ctx->slice_data[0]));
376
377
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 230 for (slice = 0; slice < nslices; slice++) {
378 184 unsigned slice_off = AV_RB32(src + tsize + FIC_HEADER_SIZE + slice * 4);
379 unsigned slice_size;
380 184 int y_off = ctx->slice_h * slice;
381 184 int slice_h = ctx->slice_h;
382
383 /*
384 * Either read the slice size, or consume all data left.
385 * Also, special case the last slight height.
386 */
387
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 184 if (slice == nslices - 1) {
388 46 slice_size = msize;
389 46 slice_h = FFALIGN(avctx->height - ctx->slice_h * (nslices - 1), 16);
390 } else {
391 138 slice_size = AV_RB32(src + tsize + FIC_HEADER_SIZE + slice * 4 + 4);
392
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 138 if (slice_size < slice_off)
393 ✗ return AVERROR_INVALIDDATA;
394 }
395
396
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 184 if (slice_size < slice_off || slice_size > msize)
397 8 continue;
398
399 176 slice_size -= slice_off;
400
401 176 ctx->slice_data[slice].src = sdata + slice_off;
402 176 ctx->slice_data[slice].src_size = slice_size;
403 176 ctx->slice_data[slice].slice_h = slice_h;
404 176 ctx->slice_data[slice].y_off = y_off;
405 }
406
407
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 46 if ((ret = ff_reget_buffer(avctx, ctx->frame, 0)) < 0)
408 ✗ return ret;
409
410
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 46 if ((ret = avctx->execute(avctx, fic_decode_slice, ctx->slice_data,
411 NULL, nslices, sizeof(ctx->slice_data[0]))) < 0)
412 ✗ return ret;
413
414 46 ctx->frame->flags |= AV_FRAME_FLAG_KEY;
415 46 ctx->frame->pict_type = AV_PICTURE_TYPE_I;
416
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 70 for (slice = 0; slice < nslices; slice++) {
417
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 64 if (ctx->slice_data[slice].p_frame) {
418 40 ctx->frame->flags &= ~AV_FRAME_FLAG_KEY;
419 40 ctx->frame->pict_type = AV_PICTURE_TYPE_P;
420 40 break;
421 }
422 }
423 46 ret = av_frame_replace(ctx->final_frame, ctx->frame);
424
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 46 if (ret < 0)
425 ✗ return ret;
426
427 /* Draw cursor if needed. */
428
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 46 if (!skip_cursor) {
429 /* Make frame writable. */
430 23 ret = ff_reget_buffer(avctx, ctx->final_frame, 0);
431
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 23 if (ret < 0)
432 ✗ return ret;
433
434 23 fic_draw_cursor(avctx, src + CURSOR_OFFSET, cur_x, cur_y);
435 }
436
437 23 skip:
438
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 242 if ((ret = av_frame_ref(rframe, ctx->final_frame)) < 0)
439 ✗ return ret;
440 242 *got_frame = 1;
441
442 242 return avpkt->size;
443 }
444
445 4 static av_cold int fic_decode_close(AVCodecContext *avctx)
446 {
447 4 FICContext *ctx = avctx->priv_data;
448
449 4 av_freep(&ctx->slice_data);
450 4 av_frame_free(&ctx->final_frame);
451 4 av_frame_free(&ctx->frame);
452
453 4 return 0;
454 }
455
456 4 static av_cold int fic_decode_init(AVCodecContext *avctx)
457 {
458 4 FICContext *ctx = avctx->priv_data;
459
460 /* Initialize various context values */
461 4 ctx->avctx = avctx;
462 4 ctx->aligned_width = FFALIGN(avctx->width, 16);
463 4 ctx->aligned_height = FFALIGN(avctx->height, 16);
464
465 4 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
466 4 avctx->bits_per_raw_sample = 8;
467
468 4 ctx->frame = av_frame_alloc();
469
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 4 if (!ctx->frame)
470 ✗ return AVERROR(ENOMEM);
471 4 ctx->final_frame = av_frame_alloc();
472
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 4 if (!ctx->final_frame)
473 ✗ return AVERROR(ENOMEM);
474
475 4 return 0;
476 }
477
478 static const AVOption options[] = {
479 { "skip_cursor", "skip the cursor", offsetof(FICContext, skip_cursor), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM },
480 { NULL },
481 };
482
483 static const AVClass fic_decoder_class = {
484 .class_name = "FIC decoder",
485 .item_name = av_default_item_name,
486 .option = options,
487 .version = LIBAVUTIL_VERSION_INT,
488 };
489
490 const FFCodec ff_fic_decoder = {
491 .p.name = "fic",
492 CODEC_LONG_NAME("Mirillis FIC"),
493 .p.type = AVMEDIA_TYPE_VIDEO,
494 .p.id = AV_CODEC_ID_FIC,
495 .priv_data_size = sizeof(FICContext),
496 .init = fic_decode_init,
497 FF_CODEC_DECODE_CB(fic_decode_frame),
498 .close = fic_decode_close,
499 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS,
500 .p.priv_class = &fic_decoder_class,
501 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
502 };
503