FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/fic.c
Date: 2024-04-25 15:36:26
Exec Total Coverage
Lines: 194 229 84.7%
Functions: 9 9 100.0%
Branches: 85 118 72.0%
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 uint8_t cursor_buf[4096];
60 int skip_cursor;
61 } FICContext;
62
63 static const uint8_t fic_qmat_hq[64] = {
64 1, 2, 2, 2, 3, 3, 3, 4,
65 2, 2, 2, 3, 3, 3, 4, 4,
66 2, 2, 3, 3, 3, 4, 4, 4,
67 2, 2, 3, 3, 3, 4, 4, 5,
68 2, 3, 3, 3, 4, 4, 5, 6,
69 3, 3, 3, 4, 4, 5, 6, 7,
70 3, 3, 3, 4, 4, 5, 7, 7,
71 3, 3, 4, 4, 5, 7, 7, 7,
72 };
73
74 static const uint8_t fic_qmat_lq[64] = {
75 1, 5, 6, 7, 8, 9, 9, 11,
76 5, 5, 7, 8, 9, 9, 11, 12,
77 6, 7, 8, 9, 9, 11, 11, 12,
78 7, 7, 8, 9, 9, 11, 12, 13,
79 7, 8, 9, 9, 10, 11, 13, 16,
80 8, 9, 9, 10, 11, 13, 16, 19,
81 8, 9, 9, 11, 12, 15, 18, 23,
82 9, 9, 11, 12, 15, 18, 23, 27
83 };
84
85 static const uint8_t fic_header[7] = { 0, 0, 1, 'F', 'I', 'C', 'V' };
86
87 #define FIC_HEADER_SIZE 27
88 #define CURSOR_OFFSET 59
89
90 1030768 static av_always_inline void fic_idct(int16_t *blk, int step, int shift, int rnd)
91 {
92 1030768 const unsigned t0 = 27246 * blk[3 * step] + 18405 * blk[5 * step];
93 1030768 const unsigned t1 = 27246 * blk[5 * step] - 18405 * blk[3 * step];
94 1030768 const unsigned t2 = 6393 * blk[7 * step] + 32139 * blk[1 * step];
95 1030768 const unsigned t3 = 6393 * blk[1 * step] - 32139 * blk[7 * step];
96 1030768 const unsigned t4 = 5793U * ((int)(t2 + t0 + 0x800) >> 12);
97 1030768 const unsigned t5 = 5793U * ((int)(t3 + t1 + 0x800) >> 12);
98 1030768 const unsigned t6 = t2 - t0;
99 1030768 const unsigned t7 = t3 - t1;
100 1030768 const unsigned t8 = 17734 * blk[2 * step] - 42813 * blk[6 * step];
101 1030768 const unsigned t9 = 17734 * blk[6 * step] + 42814 * blk[2 * step];
102 1030768 const unsigned tA = (blk[0 * step] - blk[4 * step]) * 32768 + rnd;
103 1030768 const unsigned tB = (blk[0 * step] + blk[4 * step]) * 32768 + rnd;
104 1030768 blk[0 * step] = (int)( t4 + t9 + tB) >> shift;
105 1030768 blk[1 * step] = (int)( t6 + t7 + t8 + tA) >> shift;
106 1030768 blk[2 * step] = (int)( t6 - t7 - t8 + tA) >> shift;
107 1030768 blk[3 * step] = (int)( t5 - t9 + tB) >> shift;
108 1030768 blk[4 * step] = (int)( -t5 - t9 + tB) >> shift;
109 1030768 blk[5 * step] = (int)(-(t6 - t7) - t8 + tA) >> shift;
110 1030768 blk[6 * step] = (int)(-(t6 + t7) + t8 + tA) >> shift;
111 1030768 blk[7 * step] = (int)( -t4 + t9 + tB) >> shift;
112 1030768 }
113
114 64423 static void fic_idct_put(uint8_t *dst, int stride, int16_t *block)
115 {
116 int i, j;
117 int16_t *ptr;
118
119 64423 ptr = block;
120 64423 fic_idct(ptr++, 8, 13, (1 << 12) + (1 << 17));
121
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 515384 for (i = 1; i < 8; i++) {
122 450961 fic_idct(ptr, 8, 13, 1 << 12);
123 450961 ptr++;
124 }
125
126 64423 ptr = block;
127
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 579807 for (i = 0; i < 8; i++) {
128 515384 fic_idct(ptr, 1, 20, 0);
129 515384 ptr += 8;
130 }
131
132 64423 ptr = block;
133
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 579807 for (j = 0; j < 8; j++) {
134
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 4638456 for (i = 0; i < 8; i++)
135 4123072 dst[i] = av_clip_uint8(ptr[i]);
136 515384 dst += stride;
137 515384 ptr += 8;
138 }
139 64423 }
140 538550 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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 538550 if (get_bits_left(gb) < 8)
146 3 return AVERROR_INVALIDDATA;
147
148 /* Is it a skip block? */
149
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 538547 if (get_bits1(gb)) {
150 474124 *is_p = 1;
151 474124 return 0;
152 }
153
154 64423 memset(block, 0, sizeof(*block) * 64);
155
156 64423 num_coeff = get_bits(gb, 7);
157
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 64423 if (num_coeff > 64)
158 ✗ return AVERROR_INVALIDDATA;
159
160
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 1189311 for (i = 0; i < num_coeff; i++) {
161 1124888 int v = get_se_golomb(gb);
162
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 1124888 if (v < -2048 || v > 2048)
163 ✗ return AVERROR_INVALIDDATA;
164 1124888 block[ff_zigzag_direct[i]] = v *
165 1124888 ctx->qmat[ff_zigzag_direct[i]];
166 }
167
168 64423 fic_idct_put(dst, stride, block);
169
170 64423 return 0;
171 }
172
173 92 static int fic_decode_slice(AVCodecContext *avctx, void *tdata)
174 {
175 92 FICContext *ctx = avctx->priv_data;
176 92 FICThreadContext *tctx = tdata;
177 GetBitContext gb;
178 92 const uint8_t *src = tctx->src;
179 92 int slice_h = tctx->slice_h;
180 92 int src_size = tctx->src_size;
181 92 int y_off = tctx->y_off;
182 int x, y, p, ret;
183
184 92 ret = init_get_bits8(&gb, src, src_size);
185
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 92 if (ret < 0)
186 4 return ret;
187
188
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 349 for (p = 0; p < 3; p++) {
189 264 int stride = ctx->frame->linesize[p];
190 264 uint8_t* dst = ctx->frame->data[p] + (y_off >> !!p) * stride;
191
192
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 4485 for (y = 0; y < (slice_h >> !!p); y += 8) {
193
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 542771 for (x = 0; x < (ctx->aligned_width >> !!p); x += 8) {
194 int ret;
195
196
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 538550 if ((ret = fic_decode_block(ctx, &gb, dst + x, stride,
197 538550 tctx->block, &tctx->p_frame)) != 0)
198 3 return ret;
199 }
200
201 4221 dst += 8 * stride;
202 }
203 }
204
205 85 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, int cur_x, int cur_y)
218 {
219 23 FICContext *ctx = avctx->priv_data;
220 23 uint8_t *ptr = ctx->cursor_buf;
221 uint8_t *dstptr[3];
222 uint8_t planes[4][1024];
223 uint8_t chroma[3][256];
224 int i, j, p;
225
226 /* Convert to YUVA444. */
227
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 23575 for (i = 0; i < 1024; i++) {
228 23552 planes[0][i] = (( 25 * ptr[0] + 129 * ptr[1] + 66 * ptr[2]) / 255) + 16;
229 23552 planes[1][i] = ((-38 * ptr[0] + 112 * ptr[1] + -74 * ptr[2]) / 255) + 128;
230 23552 planes[2][i] = ((-18 * ptr[0] + 112 * ptr[1] + -94 * ptr[2]) / 255) + 128;
231 23552 planes[3][i] = ptr[3];
232
233 23552 ptr += 4;
234 }
235
236 /* Subsample chroma. */
237
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 391 for (i = 0; i < 32; i += 2)
238
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 6256 for (j = 0; j < 32; j += 2)
239
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 23552 for (p = 0; p < 3; p++)
240 17664 chroma[p][16 * (i / 2) + j / 2] = (planes[p + 1][32 * i + j ] +
241 17664 planes[p + 1][32 * i + j + 1] +
242 17664 planes[p + 1][32 * (i + 1) + j ] +
243 17664 planes[p + 1][32 * (i + 1) + j + 1]) / 4;
244
245 /* Seek to x/y pos of cursor. */
246
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 92 for (i = 0; i < 3; i++)
247 69 dstptr[i] = ctx->final_frame->data[i] +
248 69 (ctx->final_frame->linesize[i] * (cur_y >> !!i)) +
249 69 (cur_x >> !!i) + !!i;
250
251 /* Copy. */
252
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 391 for (i = 0; i < FFMIN(32, avctx->height - cur_y) - 1; i += 2) {
253 368 int lsize = FFMIN(32, avctx->width - cur_x);
254 368 int csize = lsize / 2;
255
256 368 fic_alpha_blend(dstptr[0],
257 368 planes[0] + i * 32, lsize, planes[3] + i * 32);
258 368 fic_alpha_blend(dstptr[0] + ctx->final_frame->linesize[0],
259 368 planes[0] + (i + 1) * 32, lsize, planes[3] + (i + 1) * 32);
260 368 fic_alpha_blend(dstptr[1],
261 368 chroma[0] + (i / 2) * 16, csize, chroma[2] + (i / 2) * 16);
262 368 fic_alpha_blend(dstptr[2],
263 368 chroma[1] + (i / 2) * 16, csize, chroma[2] + (i / 2) * 16);
264
265 368 dstptr[0] += ctx->final_frame->linesize[0] * 2;
266 368 dstptr[1] += ctx->final_frame->linesize[1];
267 368 dstptr[2] += ctx->final_frame->linesize[2];
268 }
269 23 }
270
271 121 static int fic_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
272 int *got_frame, AVPacket *avpkt)
273 {
274 121 FICContext *ctx = avctx->priv_data;
275 121 const uint8_t *src = avpkt->data;
276 int ret;
277 int slice, nslices;
278 int msize;
279 int tsize;
280 int cur_x, cur_y;
281 121 int skip_cursor = ctx->skip_cursor;
282 const uint8_t *sdata;
283
284
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 121 if ((ret = ff_reget_buffer(avctx, ctx->frame, 0)) < 0)
285 ✗ return ret;
286
287 /* Header + at least one slice (4) */
288
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 121 if (avpkt->size < FIC_HEADER_SIZE + 4) {
289 ✗ av_log(avctx, AV_LOG_ERROR, "Frame data is too small.\n");
290 ✗ return AVERROR_INVALIDDATA;
291 }
292
293 /* Check for header. */
294
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 121 if (memcmp(src, fic_header, 7))
295 ✗ av_log(avctx, AV_LOG_WARNING, "Invalid FIC Header.\n");
296
297 /* Is it a skip frame? */
298
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 121 if (src[17]) {
299
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 98 if (!ctx->final_frame) {
300 ✗ av_log(avctx, AV_LOG_WARNING, "Initial frame is skipped\n");
301 ✗ return AVERROR_INVALIDDATA;
302 }
303 98 goto skip;
304 }
305
306 23 nslices = src[13];
307
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 23 if (!nslices) {
308 ✗ av_log(avctx, AV_LOG_ERROR, "Zero slices found.\n");
309 ✗ return AVERROR_INVALIDDATA;
310 }
311
312 /* High or Low Quality Matrix? */
313
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 23 ctx->qmat = src[23] ? fic_qmat_hq : fic_qmat_lq;
314
315 /* Skip cursor data. */
316 23 tsize = AV_RB24(src + 24);
317
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 23 if (tsize > avpkt->size - FIC_HEADER_SIZE) {
318 ✗ av_log(avctx, AV_LOG_ERROR,
319 "Packet is too small to contain cursor (%d vs %d bytes).\n",
320 ✗ tsize, avpkt->size - FIC_HEADER_SIZE);
321 ✗ return AVERROR_INVALIDDATA;
322 }
323
324
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 23 if (!tsize || !AV_RL16(src + 37) || !AV_RL16(src + 39))
325 ✗ skip_cursor = 1;
326
327
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 23 if (!skip_cursor && tsize < 32) {
328 ✗ av_log(avctx, AV_LOG_WARNING,
329 "Cursor data too small. Skipping cursor.\n");
330 ✗ skip_cursor = 1;
331 }
332
333 /* Cursor position. */
334 23 cur_x = AV_RL16(src + 33);
335 23 cur_y = AV_RL16(src + 35);
336
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 23 if (!skip_cursor && (cur_x > avctx->width || cur_y > avctx->height)) {
337 ✗ av_log(avctx, AV_LOG_DEBUG,
338 "Invalid cursor position: (%d,%d). Skipping cursor.\n",
339 cur_x, cur_y);
340 ✗ skip_cursor = 1;
341 }
342
343
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 23 if (!skip_cursor && (AV_RL16(src + 37) != 32 || AV_RL16(src + 39) != 32)) {
344 ✗ av_log(avctx, AV_LOG_WARNING,
345 "Invalid cursor size. Skipping cursor.\n");
346 ✗ skip_cursor = 1;
347 }
348
349
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 23 if (!skip_cursor && avpkt->size < CURSOR_OFFSET + sizeof(ctx->cursor_buf)) {
350 ✗ skip_cursor = 1;
351 }
352
353 /* Slice height for all but the last slice. */
354 23 ctx->slice_h = 16 * (ctx->aligned_height >> 4) / nslices;
355
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 23 if (ctx->slice_h % 16)
356 ✗ ctx->slice_h = FFALIGN(ctx->slice_h - 16, 16);
357
358 /* First slice offset and remaining data. */
359 23 sdata = src + tsize + FIC_HEADER_SIZE + 4 * nslices;
360 23 msize = avpkt->size - nslices * 4 - tsize - FIC_HEADER_SIZE;
361
362
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 23 if (msize <= ctx->aligned_width/8 * (ctx->aligned_height/8) / 8) {
363 ✗ av_log(avctx, AV_LOG_ERROR, "Not enough frame data to decode.\n");
364 ✗ return AVERROR_INVALIDDATA;
365 }
366
367 /* Allocate slice data. */
368 23 av_fast_malloc(&ctx->slice_data, &ctx->slice_data_size,
369 nslices * sizeof(ctx->slice_data[0]));
370
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 23 if (!ctx->slice_data_size) {
371 ✗ av_log(avctx, AV_LOG_ERROR, "Could not allocate slice data.\n");
372 ✗ return AVERROR(ENOMEM);
373 }
374 23 memset(ctx->slice_data, 0, nslices * sizeof(ctx->slice_data[0]));
375
376
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 115 for (slice = 0; slice < nslices; slice++) {
377 92 unsigned slice_off = AV_RB32(src + tsize + FIC_HEADER_SIZE + slice * 4);
378 unsigned slice_size;
379 92 int y_off = ctx->slice_h * slice;
380 92 int slice_h = ctx->slice_h;
381
382 /*
383 * Either read the slice size, or consume all data left.
384 * Also, special case the last slight height.
385 */
386
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 92 if (slice == nslices - 1) {
387 23 slice_size = msize;
388 23 slice_h = FFALIGN(avctx->height - ctx->slice_h * (nslices - 1), 16);
389 } else {
390 69 slice_size = AV_RB32(src + tsize + FIC_HEADER_SIZE + slice * 4 + 4);
391
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 69 if (slice_size < slice_off)
392 ✗ return AVERROR_INVALIDDATA;
393 }
394
395
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 92 if (slice_size < slice_off || slice_size > msize)
396 4 continue;
397
398 88 slice_size -= slice_off;
399
400 88 ctx->slice_data[slice].src = sdata + slice_off;
401 88 ctx->slice_data[slice].src_size = slice_size;
402 88 ctx->slice_data[slice].slice_h = slice_h;
403 88 ctx->slice_data[slice].y_off = y_off;
404 }
405
406
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 23 if ((ret = avctx->execute(avctx, fic_decode_slice, ctx->slice_data,
407 NULL, nslices, sizeof(ctx->slice_data[0]))) < 0)
408 ✗ return ret;
409
410 23 ctx->frame->flags |= AV_FRAME_FLAG_KEY;
411 23 ctx->frame->pict_type = AV_PICTURE_TYPE_I;
412
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 35 for (slice = 0; slice < nslices; slice++) {
413
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 32 if (ctx->slice_data[slice].p_frame) {
414 20 ctx->frame->flags &= ~AV_FRAME_FLAG_KEY;
415 20 ctx->frame->pict_type = AV_PICTURE_TYPE_P;
416 20 break;
417 }
418 }
419 23 av_frame_free(&ctx->final_frame);
420 23 ctx->final_frame = av_frame_clone(ctx->frame);
421
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 23 if (!ctx->final_frame) {
422 ✗ av_log(avctx, AV_LOG_ERROR, "Could not clone frame buffer.\n");
423 ✗ return AVERROR(ENOMEM);
424 }
425
426 /* Make sure we use a user-supplied buffer. */
427
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 23 if ((ret = ff_reget_buffer(avctx, ctx->final_frame, 0)) < 0) {
428 ✗ av_log(avctx, AV_LOG_ERROR, "Could not make frame writable.\n");
429 ✗ return ret;
430 }
431
432 /* Draw cursor. */
433
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 23 if (!skip_cursor) {
434 23 memcpy(ctx->cursor_buf, src + CURSOR_OFFSET, sizeof(ctx->cursor_buf));
435 23 fic_draw_cursor(avctx, cur_x, cur_y);
436 }
437
438 ✗ skip:
439 121 *got_frame = 1;
440
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 121 if ((ret = av_frame_ref(rframe, ctx->final_frame)) < 0)
441 ✗ return ret;
442
443 121 return avpkt->size;
444 }
445
446 2 static av_cold int fic_decode_close(AVCodecContext *avctx)
447 {
448 2 FICContext *ctx = avctx->priv_data;
449
450 2 av_freep(&ctx->slice_data);
451 2 av_frame_free(&ctx->final_frame);
452 2 av_frame_free(&ctx->frame);
453
454 2 return 0;
455 }
456
457 2 static av_cold int fic_decode_init(AVCodecContext *avctx)
458 {
459 2 FICContext *ctx = avctx->priv_data;
460
461 /* Initialize various context values */
462 2 ctx->avctx = avctx;
463 2 ctx->aligned_width = FFALIGN(avctx->width, 16);
464 2 ctx->aligned_height = FFALIGN(avctx->height, 16);
465
466 2 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
467 2 avctx->bits_per_raw_sample = 8;
468
469 2 ctx->frame = av_frame_alloc();
470
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 2 if (!ctx->frame)
471 ✗ return AVERROR(ENOMEM);
472
473 2 return 0;
474 }
475
476 static const AVOption options[] = {
477 { "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 },
478 { NULL },
479 };
480
481 static const AVClass fic_decoder_class = {
482 .class_name = "FIC decoder",
483 .item_name = av_default_item_name,
484 .option = options,
485 .version = LIBAVUTIL_VERSION_INT,
486 };
487
488 const FFCodec ff_fic_decoder = {
489 .p.name = "fic",
490 CODEC_LONG_NAME("Mirillis FIC"),
491 .p.type = AVMEDIA_TYPE_VIDEO,
492 .p.id = AV_CODEC_ID_FIC,
493 .priv_data_size = sizeof(FICContext),
494 .init = fic_decode_init,
495 FF_CODEC_DECODE_CB(fic_decode_frame),
496 .close = fic_decode_close,
497 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS,
498 .p.priv_class = &fic_decoder_class,
499 };
500