FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/fic.c
Date: 2022-01-22 23:30:28
Exec Total Coverage
Lines: 194 229 84.7%
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_internal.h"
26 #include "libavutil/opt.h"
27 #include "avcodec.h"
28 #include "internal.h"
29 #include "get_bits.h"
30 #include "golomb.h"
31
32 typedef struct FICThreadContext {
33 DECLARE_ALIGNED(16, int16_t, block)[64];
34 uint8_t *src;
35 int slice_h;
36 int src_size;
37 int y_off;
38 int p_frame;
39 } FICThreadContext;
40
41 typedef struct FICContext {
42 AVClass *class;
43 AVCodecContext *avctx;
44 AVFrame *frame;
45 AVFrame *final_frame;
46
47 FICThreadContext *slice_data;
48 int slice_data_size;
49
50 const uint8_t *qmat;
51
52 enum AVPictureType cur_frame_type;
53
54 int aligned_width, aligned_height;
55 int num_slices, slice_h;
56
57 uint8_t cursor_buf[4096];
58 int skip_cursor;
59 } FICContext;
60
61 static const uint8_t fic_qmat_hq[64] = {
62 1, 2, 2, 2, 3, 3, 3, 4,
63 2, 2, 2, 3, 3, 3, 4, 4,
64 2, 2, 3, 3, 3, 4, 4, 4,
65 2, 2, 3, 3, 3, 4, 4, 5,
66 2, 3, 3, 3, 4, 4, 5, 6,
67 3, 3, 3, 4, 4, 5, 6, 7,
68 3, 3, 3, 4, 4, 5, 7, 7,
69 3, 3, 4, 4, 5, 7, 7, 7,
70 };
71
72 static const uint8_t fic_qmat_lq[64] = {
73 1, 5, 6, 7, 8, 9, 9, 11,
74 5, 5, 7, 8, 9, 9, 11, 12,
75 6, 7, 8, 9, 9, 11, 11, 12,
76 7, 7, 8, 9, 9, 11, 12, 13,
77 7, 8, 9, 9, 10, 11, 13, 16,
78 8, 9, 9, 10, 11, 13, 16, 19,
79 8, 9, 9, 11, 12, 15, 18, 23,
80 9, 9, 11, 12, 15, 18, 23, 27
81 };
82
83 static const uint8_t fic_header[7] = { 0, 0, 1, 'F', 'I', 'C', 'V' };
84
85 #define FIC_HEADER_SIZE 27
86 #define CURSOR_OFFSET 59
87
88 1030768 static av_always_inline void fic_idct(int16_t *blk, int step, int shift, int rnd)
89 {
90 1030768 const unsigned t0 = 27246 * blk[3 * step] + 18405 * blk[5 * step];
91 1030768 const unsigned t1 = 27246 * blk[5 * step] - 18405 * blk[3 * step];
92 1030768 const unsigned t2 = 6393 * blk[7 * step] + 32139 * blk[1 * step];
93 1030768 const unsigned t3 = 6393 * blk[1 * step] - 32139 * blk[7 * step];
94 1030768 const unsigned t4 = 5793U * ((int)(t2 + t0 + 0x800) >> 12);
95 1030768 const unsigned t5 = 5793U * ((int)(t3 + t1 + 0x800) >> 12);
96 1030768 const unsigned t6 = t2 - t0;
97 1030768 const unsigned t7 = t3 - t1;
98 1030768 const unsigned t8 = 17734 * blk[2 * step] - 42813 * blk[6 * step];
99 1030768 const unsigned t9 = 17734 * blk[6 * step] + 42814 * blk[2 * step];
100 1030768 const unsigned tA = (blk[0 * step] - blk[4 * step]) * 32768 + rnd;
101 1030768 const unsigned tB = (blk[0 * step] + blk[4 * step]) * 32768 + rnd;
102 1030768 blk[0 * step] = (int)( t4 + t9 + tB) >> shift;
103 1030768 blk[1 * step] = (int)( t6 + t7 + t8 + tA) >> shift;
104 1030768 blk[2 * step] = (int)( t6 - t7 - t8 + tA) >> shift;
105 1030768 blk[3 * step] = (int)( t5 - t9 + tB) >> shift;
106 1030768 blk[4 * step] = (int)( -t5 - t9 + tB) >> shift;
107 1030768 blk[5 * step] = (int)(-(t6 - t7) - t8 + tA) >> shift;
108 1030768 blk[6 * step] = (int)(-(t6 + t7) + t8 + tA) >> shift;
109 1030768 blk[7 * step] = (int)( -t4 + t9 + tB) >> shift;
110 1030768 }
111
112 64423 static void fic_idct_put(uint8_t *dst, int stride, int16_t *block)
113 {
114 int i, j;
115 int16_t *ptr;
116
117 64423 ptr = block;
118 64423 fic_idct(ptr++, 8, 13, (1 << 12) + (1 << 17));
119
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 515384 for (i = 1; i < 8; i++) {
120 450961 fic_idct(ptr, 8, 13, 1 << 12);
121 450961 ptr++;
122 }
123
124 64423 ptr = block;
125
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 579807 for (i = 0; i < 8; i++) {
126 515384 fic_idct(ptr, 1, 20, 0);
127 515384 ptr += 8;
128 }
129
130 64423 ptr = block;
131
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 579807 for (j = 0; j < 8; j++) {
132
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 4638456 for (i = 0; i < 8; i++)
133 4123072 dst[i] = av_clip_uint8(ptr[i]);
134 515384 dst += stride;
135 515384 ptr += 8;
136 }
137 64423 }
138 538550 static int fic_decode_block(FICContext *ctx, GetBitContext *gb,
139 uint8_t *dst, int stride, int16_t *block, int *is_p)
140 {
141 int i, num_coeff;
142
143
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 538550 if (get_bits_left(gb) < 8)
144 3 return AVERROR_INVALIDDATA;
145
146 /* Is it a skip block? */
147
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 538547 if (get_bits1(gb)) {
148 474124 *is_p = 1;
149 474124 return 0;
150 }
151
152 64423 memset(block, 0, sizeof(*block) * 64);
153
154 64423 num_coeff = get_bits(gb, 7);
155
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 64423 if (num_coeff > 64)
156 ✗ return AVERROR_INVALIDDATA;
157
158
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 1189311 for (i = 0; i < num_coeff; i++) {
159 1124888 int v = get_se_golomb(gb);
160
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 1124888 if (v < -2048 || v > 2048)
161 ✗ return AVERROR_INVALIDDATA;
162 1124888 block[ff_zigzag_direct[i]] = v *
163 1124888 ctx->qmat[ff_zigzag_direct[i]];
164 }
165
166 64423 fic_idct_put(dst, stride, block);
167
168 64423 return 0;
169 }
170
171 92 static int fic_decode_slice(AVCodecContext *avctx, void *tdata)
172 {
173 92 FICContext *ctx = avctx->priv_data;
174 92 FICThreadContext *tctx = tdata;
175 GetBitContext gb;
176 92 uint8_t *src = tctx->src;
177 92 int slice_h = tctx->slice_h;
178 92 int src_size = tctx->src_size;
179 92 int y_off = tctx->y_off;
180 int x, y, p, ret;
181
182 92 ret = init_get_bits8(&gb, src, src_size);
183
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 92 if (ret < 0)
184 4 return ret;
185
186
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 349 for (p = 0; p < 3; p++) {
187 264 int stride = ctx->frame->linesize[p];
188 264 uint8_t* dst = ctx->frame->data[p] + (y_off >> !!p) * stride;
189
190
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 4485 for (y = 0; y < (slice_h >> !!p); y += 8) {
191
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 542771 for (x = 0; x < (ctx->aligned_width >> !!p); x += 8) {
192 int ret;
193
194
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 538550 if ((ret = fic_decode_block(ctx, &gb, dst + x, stride,
195 538550 tctx->block, &tctx->p_frame)) != 0)
196 3 return ret;
197 }
198
199 4221 dst += 8 * stride;
200 }
201 }
202
203 85 return 0;
204 }
205
206 1472 static av_always_inline void fic_alpha_blend(uint8_t *dst, uint8_t *src,
207 int size, uint8_t *alpha)
208 {
209 int i;
210
211
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 36800 for (i = 0; i < size; i++)
212 35328 dst[i] += ((src[i] - dst[i]) * alpha[i]) >> 8;
213 1472 }
214
215 23 static void fic_draw_cursor(AVCodecContext *avctx, int cur_x, int cur_y)
216 {
217 23 FICContext *ctx = avctx->priv_data;
218 23 uint8_t *ptr = ctx->cursor_buf;
219 uint8_t *dstptr[3];
220 uint8_t planes[4][1024];
221 uint8_t chroma[3][256];
222 int i, j, p;
223
224 /* Convert to YUVA444. */
225
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 23575 for (i = 0; i < 1024; i++) {
226 23552 planes[0][i] = (( 25 * ptr[0] + 129 * ptr[1] + 66 * ptr[2]) / 255) + 16;
227 23552 planes[1][i] = ((-38 * ptr[0] + 112 * ptr[1] + -74 * ptr[2]) / 255) + 128;
228 23552 planes[2][i] = ((-18 * ptr[0] + 112 * ptr[1] + -94 * ptr[2]) / 255) + 128;
229 23552 planes[3][i] = ptr[3];
230
231 23552 ptr += 4;
232 }
233
234 /* Subsample chroma. */
235
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 391 for (i = 0; i < 32; i += 2)
236
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 6256 for (j = 0; j < 32; j += 2)
237
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 23552 for (p = 0; p < 3; p++)
238 17664 chroma[p][16 * (i / 2) + j / 2] = (planes[p + 1][32 * i + j ] +
239 17664 planes[p + 1][32 * i + j + 1] +
240 17664 planes[p + 1][32 * (i + 1) + j ] +
241 17664 planes[p + 1][32 * (i + 1) + j + 1]) / 4;
242
243 /* Seek to x/y pos of cursor. */
244
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 92 for (i = 0; i < 3; i++)
245 69 dstptr[i] = ctx->final_frame->data[i] +
246 69 (ctx->final_frame->linesize[i] * (cur_y >> !!i)) +
247 69 (cur_x >> !!i) + !!i;
248
249 /* Copy. */
250
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 391 for (i = 0; i < FFMIN(32, avctx->height - cur_y) - 1; i += 2) {
251 368 int lsize = FFMIN(32, avctx->width - cur_x);
252 368 int csize = lsize / 2;
253
254 368 fic_alpha_blend(dstptr[0],
255 368 planes[0] + i * 32, lsize, planes[3] + i * 32);
256 368 fic_alpha_blend(dstptr[0] + ctx->final_frame->linesize[0],
257 368 planes[0] + (i + 1) * 32, lsize, planes[3] + (i + 1) * 32);
258 368 fic_alpha_blend(dstptr[1],
259 368 chroma[0] + (i / 2) * 16, csize, chroma[2] + (i / 2) * 16);
260 368 fic_alpha_blend(dstptr[2],
261 368 chroma[1] + (i / 2) * 16, csize, chroma[2] + (i / 2) * 16);
262
263 368 dstptr[0] += ctx->final_frame->linesize[0] * 2;
264 368 dstptr[1] += ctx->final_frame->linesize[1];
265 368 dstptr[2] += ctx->final_frame->linesize[2];
266 }
267 23 }
268
269 121 static int fic_decode_frame(AVCodecContext *avctx, void *data,
270 int *got_frame, AVPacket *avpkt)
271 {
272 121 FICContext *ctx = avctx->priv_data;
273 121 uint8_t *src = avpkt->data;
274 int ret;
275 int slice, nslices;
276 int msize;
277 int tsize;
278 int cur_x, cur_y;
279 121 int skip_cursor = ctx->skip_cursor;
280 uint8_t *sdata;
281
282
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 121 if ((ret = ff_reget_buffer(avctx, ctx->frame, 0)) < 0)
283 ✗ return ret;
284
285 /* Header + at least one slice (4) */
286
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 121 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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 121 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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 121 if (src[17]) {
297
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 98 if (!ctx->final_frame) {
298 ✗ av_log(avctx, AV_LOG_WARNING, "Initial frame is skipped\n");
299 ✗ return AVERROR_INVALIDDATA;
300 }
301 98 goto skip;
302 }
303
304 23 nslices = src[13];
305
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 23 if (!nslices) {
306 ✗ av_log(avctx, AV_LOG_ERROR, "Zero slices found.\n");
307 ✗ return AVERROR_INVALIDDATA;
308 }
309
310 /* High or Low Quality Matrix? */
311
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 23 ctx->qmat = src[23] ? fic_qmat_hq : fic_qmat_lq;
312
313 /* Skip cursor data. */
314 23 tsize = AV_RB24(src + 24);
315
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 23 if (tsize > avpkt->size - FIC_HEADER_SIZE) {
316 ✗ av_log(avctx, AV_LOG_ERROR,
317 "Packet is too small to contain cursor (%d vs %d bytes).\n",
318 ✗ tsize, avpkt->size - FIC_HEADER_SIZE);
319 ✗ return AVERROR_INVALIDDATA;
320 }
321
322
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 23 if (!tsize || !AV_RL16(src + 37) || !AV_RL16(src + 39))
323 ✗ skip_cursor = 1;
324
325
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 23 if (!skip_cursor && tsize < 32) {
326 ✗ av_log(avctx, AV_LOG_WARNING,
327 "Cursor data too small. Skipping cursor.\n");
328 ✗ skip_cursor = 1;
329 }
330
331 /* Cursor position. */
332 23 cur_x = AV_RL16(src + 33);
333 23 cur_y = AV_RL16(src + 35);
334
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 23 if (!skip_cursor && (cur_x > avctx->width || cur_y > avctx->height)) {
335 ✗ av_log(avctx, AV_LOG_DEBUG,
336 "Invalid cursor position: (%d,%d). Skipping cursor.\n",
337 cur_x, cur_y);
338 ✗ skip_cursor = 1;
339 }
340
341
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 23 if (!skip_cursor && (AV_RL16(src + 37) != 32 || AV_RL16(src + 39) != 32)) {
342 ✗ av_log(avctx, AV_LOG_WARNING,
343 "Invalid cursor size. Skipping cursor.\n");
344 ✗ skip_cursor = 1;
345 }
346
347
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 23 if (!skip_cursor && avpkt->size < CURSOR_OFFSET + sizeof(ctx->cursor_buf)) {
348 ✗ skip_cursor = 1;
349 }
350
351 /* Slice height for all but the last slice. */
352 23 ctx->slice_h = 16 * (ctx->aligned_height >> 4) / nslices;
353
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 23 if (ctx->slice_h % 16)
354 ✗ ctx->slice_h = FFALIGN(ctx->slice_h - 16, 16);
355
356 /* First slice offset and remaining data. */
357 23 sdata = src + tsize + FIC_HEADER_SIZE + 4 * nslices;
358 23 msize = avpkt->size - nslices * 4 - tsize - FIC_HEADER_SIZE;
359
360
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 23 if (msize <= ctx->aligned_width/8 * (ctx->aligned_height/8) / 8) {
361 ✗ av_log(avctx, AV_LOG_ERROR, "Not enough frame data to decode.\n");
362 ✗ return AVERROR_INVALIDDATA;
363 }
364
365 /* Allocate slice data. */
366 23 av_fast_malloc(&ctx->slice_data, &ctx->slice_data_size,
367 nslices * sizeof(ctx->slice_data[0]));
368
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 23 if (!ctx->slice_data_size) {
369 ✗ av_log(avctx, AV_LOG_ERROR, "Could not allocate slice data.\n");
370 ✗ return AVERROR(ENOMEM);
371 }
372 23 memset(ctx->slice_data, 0, nslices * sizeof(ctx->slice_data[0]));
373
374
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 115 for (slice = 0; slice < nslices; slice++) {
375 92 unsigned slice_off = AV_RB32(src + tsize + FIC_HEADER_SIZE + slice * 4);
376 unsigned slice_size;
377 92 int y_off = ctx->slice_h * slice;
378 92 int slice_h = ctx->slice_h;
379
380 /*
381 * Either read the slice size, or consume all data left.
382 * Also, special case the last slight height.
383 */
384
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 92 if (slice == nslices - 1) {
385 23 slice_size = msize;
386 23 slice_h = FFALIGN(avctx->height - ctx->slice_h * (nslices - 1), 16);
387 } else {
388 69 slice_size = AV_RB32(src + tsize + FIC_HEADER_SIZE + slice * 4 + 4);
389
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 69 if (slice_size < slice_off)
390 ✗ return AVERROR_INVALIDDATA;
391 }
392
393
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 92 if (slice_size < slice_off || slice_size > msize)
394 4 continue;
395
396 88 slice_size -= slice_off;
397
398 88 ctx->slice_data[slice].src = sdata + slice_off;
399 88 ctx->slice_data[slice].src_size = slice_size;
400 88 ctx->slice_data[slice].slice_h = slice_h;
401 88 ctx->slice_data[slice].y_off = y_off;
402 }
403
404
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 23 if ((ret = avctx->execute(avctx, fic_decode_slice, ctx->slice_data,
405 NULL, nslices, sizeof(ctx->slice_data[0]))) < 0)
406 ✗ return ret;
407
408 23 ctx->frame->key_frame = 1;
409 23 ctx->frame->pict_type = AV_PICTURE_TYPE_I;
410
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 35 for (slice = 0; slice < nslices; slice++) {
411
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 32 if (ctx->slice_data[slice].p_frame) {
412 20 ctx->frame->key_frame = 0;
413 20 ctx->frame->pict_type = AV_PICTURE_TYPE_P;
414 20 break;
415 }
416 }
417 23 av_frame_free(&ctx->final_frame);
418 23 ctx->final_frame = av_frame_clone(ctx->frame);
419
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 23 if (!ctx->final_frame) {
420 ✗ av_log(avctx, AV_LOG_ERROR, "Could not clone frame buffer.\n");
421 ✗ return AVERROR(ENOMEM);
422 }
423
424 /* Make sure we use a user-supplied buffer. */
425
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 23 if ((ret = ff_reget_buffer(avctx, ctx->final_frame, 0)) < 0) {
426 ✗ av_log(avctx, AV_LOG_ERROR, "Could not make frame writable.\n");
427 ✗ return ret;
428 }
429
430 /* Draw cursor. */
431
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 23 if (!skip_cursor) {
432 23 memcpy(ctx->cursor_buf, src + CURSOR_OFFSET, sizeof(ctx->cursor_buf));
433 23 fic_draw_cursor(avctx, cur_x, cur_y);
434 }
435
436 ✗ skip:
437 121 *got_frame = 1;
438
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 121 if ((ret = av_frame_ref(data, ctx->final_frame)) < 0)
439 ✗ return ret;
440
441 121 return avpkt->size;
442 }
443
444 2 static av_cold int fic_decode_close(AVCodecContext *avctx)
445 {
446 2 FICContext *ctx = avctx->priv_data;
447
448 2 av_freep(&ctx->slice_data);
449 2 av_frame_free(&ctx->final_frame);
450 2 av_frame_free(&ctx->frame);
451
452 2 return 0;
453 }
454
455 2 static av_cold int fic_decode_init(AVCodecContext *avctx)
456 {
457 2 FICContext *ctx = avctx->priv_data;
458
459 /* Initialize various context values */
460 2 ctx->avctx = avctx;
461 2 ctx->aligned_width = FFALIGN(avctx->width, 16);
462 2 ctx->aligned_height = FFALIGN(avctx->height, 16);
463
464 2 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
465 2 avctx->bits_per_raw_sample = 8;
466
467 2 ctx->frame = av_frame_alloc();
468
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 2 if (!ctx->frame)
469 ✗ return AVERROR(ENOMEM);
470
471 2 return 0;
472 }
473
474 static const AVOption options[] = {
475 { "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 },
476 { NULL },
477 };
478
479 static const AVClass fic_decoder_class = {
480 .class_name = "FIC decoder",
481 .item_name = av_default_item_name,
482 .option = options,
483 .version = LIBAVUTIL_VERSION_INT,
484 };
485
486 const AVCodec ff_fic_decoder = {
487 .name = "fic",
488 .long_name = NULL_IF_CONFIG_SMALL("Mirillis FIC"),
489 .type = AVMEDIA_TYPE_VIDEO,
490 .id = AV_CODEC_ID_FIC,
491 .priv_data_size = sizeof(FICContext),
492 .init = fic_decode_init,
493 .decode = fic_decode_frame,
494 .close = fic_decode_close,
495 .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS,
496 .priv_class = &fic_decoder_class,
497 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
498 };
499