FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/ulti.c
Date: 2025-07-18 13:13:50
Exec Total Coverage
Lines: 201 257 78.2%
Functions: 6 6 100.0%
Branches: 66 87 75.9%
Line Branch Exec Source
1 /*
2 * IBM Ultimotion Video Decoder
3 * Copyright (C) 2004 Konstantin Shishkov
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 * IBM Ultimotion Video Decoder.
25 */
26
27 #include "avcodec.h"
28 #include "bytestream.h"
29 #include "codec_internal.h"
30 #include "decode.h"
31
32 #include "ulti_cb.h"
33
34 typedef struct UltimotionDecodeContext {
35 AVCodecContext *avctx;
36 int width, height, blocks;
37 AVFrame *frame;
38 const uint8_t *ulti_codebook;
39 GetByteContext gb;
40 } UltimotionDecodeContext;
41
42 2 static av_cold int ulti_decode_init(AVCodecContext *avctx)
43 {
44 2 UltimotionDecodeContext *s = avctx->priv_data;
45
46 2 s->avctx = avctx;
47 2 s->width = avctx->width;
48 2 s->height = avctx->height;
49 2 s->blocks = (s->width / 8) * (s->height / 8);
50
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 2 if (s->blocks == 0)
51 ✗ return AVERROR_INVALIDDATA;
52 2 avctx->pix_fmt = AV_PIX_FMT_YUV410P;
53 2 s->ulti_codebook = ulti_codebook;
54
55 2 s->frame = av_frame_alloc();
56
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 2 if (!s->frame)
57 ✗ return AVERROR(ENOMEM);
58
59 2 return 0;
60 }
61
62 2 static av_cold int ulti_decode_end(AVCodecContext *avctx)
63 {
64 2 UltimotionDecodeContext *s = avctx->priv_data;
65
66 2 av_frame_free(&s->frame);
67
68 2 return 0;
69 }
70
71 static const int block_coords[8] = // 4x4 block coords in 8x8 superblock
72 { 0, 0, 0, 4, 4, 4, 4, 0};
73
74 static const int angle_by_index[4] = { 0, 2, 6, 12};
75
76 /* Lookup tables for luma and chroma - used by ulti_convert_yuv() */
77 static const uint8_t ulti_lumas[64] =
78 { 0x10, 0x13, 0x17, 0x1A, 0x1E, 0x21, 0x25, 0x28,
79 0x2C, 0x2F, 0x33, 0x36, 0x3A, 0x3D, 0x41, 0x44,
80 0x48, 0x4B, 0x4F, 0x52, 0x56, 0x59, 0x5C, 0x60,
81 0x63, 0x67, 0x6A, 0x6E, 0x71, 0x75, 0x78, 0x7C,
82 0x7F, 0x83, 0x86, 0x8A, 0x8D, 0x91, 0x94, 0x98,
83 0x9B, 0x9F, 0xA2, 0xA5, 0xA9, 0xAC, 0xB0, 0xB3,
84 0xB7, 0xBA, 0xBE, 0xC1, 0xC5, 0xC8, 0xCC, 0xCF,
85 0xD3, 0xD6, 0xDA, 0xDD, 0xE1, 0xE4, 0xE8, 0xEB};
86
87 static const uint8_t ulti_chromas[16] =
88 { 0x60, 0x67, 0x6D, 0x73, 0x7A, 0x80, 0x86, 0x8D,
89 0x93, 0x99, 0xA0, 0xA6, 0xAC, 0xB3, 0xB9, 0xC0};
90
91 /* convert Ultimotion YUV block (sixteen 6-bit Y samples and
92 two 4-bit chroma samples) into standard YUV and put it into frame */
93 206695 static void ulti_convert_yuv(AVFrame *frame, int x, int y,
94 uint8_t *luma,int chroma)
95 {
96 uint8_t *y_plane, *cr_plane, *cb_plane;
97 int i;
98
99 206695 y_plane = frame->data[0] + x + y * frame->linesize[0];
100 206695 cr_plane = frame->data[1] + (x / 4) + (y / 4) * frame->linesize[1];
101 206695 cb_plane = frame->data[2] + (x / 4) + (y / 4) * frame->linesize[2];
102
103 206695 cr_plane[0] = ulti_chromas[chroma >> 4];
104
105 206695 cb_plane[0] = ulti_chromas[chroma & 0xF];
106
107
108
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 3513815 for(i = 0; i < 16; i++){
109 3307120 y_plane[i & 3] = ulti_lumas[luma[i]];
110
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 3307120 if((i & 3) == 3) { //next row
111 826780 y_plane += frame->linesize[0];
112 }
113 }
114 206695 }
115
116 /* generate block like in MS Video1 */
117 43140 static void ulti_pattern(AVFrame *frame, int x, int y,
118 int f0, int f1, int Y0, int Y1, int chroma)
119 {
120 uint8_t Luma[16];
121 int mask, i;
122
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 388260 for(mask = 0x80, i = 0; mask; mask >>= 1, i++) {
123
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 345120 if(f0 & mask)
124 146257 Luma[i] = Y1;
125 else
126 198863 Luma[i] = Y0;
127 }
128
129
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 388260 for(mask = 0x80, i = 8; mask; mask >>= 1, i++) {
130
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 345120 if(f1 & mask)
131 185919 Luma[i] = Y1;
132 else
133 159201 Luma[i] = Y0;
134 }
135
136 43140 ulti_convert_yuv(frame, x, y, Luma, chroma);
137 43140 }
138
139 /* fill block with some gradient */
140 163555 static void ulti_grad(AVFrame *frame, int x, int y, uint8_t *Y, int chroma, int angle)
141 {
142 uint8_t Luma[16];
143
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 163555 if(angle & 8) { //reverse order
144 int t;
145 56848 angle &= 0x7;
146 56848 t = Y[0];
147 56848 Y[0] = Y[3];
148 56848 Y[3] = t;
149 56848 t = Y[1];
150 56848 Y[1] = Y[2];
151 56848 Y[2] = t;
152 }
153
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 163555 switch(angle){
154 44413 case 0:
155 44413 Luma[0] = Y[0]; Luma[1] = Y[1]; Luma[2] = Y[2]; Luma[3] = Y[3];
156 44413 Luma[4] = Y[0]; Luma[5] = Y[1]; Luma[6] = Y[2]; Luma[7] = Y[3];
157 44413 Luma[8] = Y[0]; Luma[9] = Y[1]; Luma[10] = Y[2]; Luma[11] = Y[3];
158 44413 Luma[12] = Y[0]; Luma[13] = Y[1]; Luma[14] = Y[2]; Luma[15] = Y[3];
159 44413 break;
160 4503 case 1:
161 4503 Luma[0] = Y[1]; Luma[1] = Y[2]; Luma[2] = Y[3]; Luma[3] = Y[3];
162 4503 Luma[4] = Y[0]; Luma[5] = Y[1]; Luma[6] = Y[2]; Luma[7] = Y[3];
163 4503 Luma[8] = Y[0]; Luma[9] = Y[1]; Luma[10] = Y[2]; Luma[11] = Y[3];
164 4503 Luma[12] = Y[0]; Luma[13] = Y[0]; Luma[14] = Y[1]; Luma[15] = Y[2];
165 4503 break;
166 8134 case 2:
167 8134 Luma[0] = Y[1]; Luma[1] = Y[2]; Luma[2] = Y[3]; Luma[3] = Y[3];
168 8134 Luma[4] = Y[1]; Luma[5] = Y[2]; Luma[6] = Y[2]; Luma[7] = Y[3];
169 8134 Luma[8] = Y[0]; Luma[9] = Y[1]; Luma[10] = Y[1]; Luma[11] = Y[2];
170 8134 Luma[12] = Y[0]; Luma[13] = Y[0]; Luma[14] = Y[1]; Luma[15] = Y[2];
171 8134 break;
172 8428 case 3:
173 8428 Luma[0] = Y[2]; Luma[1] = Y[3]; Luma[2] = Y[3]; Luma[3] = Y[3];
174 8428 Luma[4] = Y[1]; Luma[5] = Y[2]; Luma[6] = Y[2]; Luma[7] = Y[3];
175 8428 Luma[8] = Y[0]; Luma[9] = Y[1]; Luma[10] = Y[1]; Luma[11] = Y[2];
176 8428 Luma[12] = Y[0]; Luma[13] = Y[0]; Luma[14] = Y[0]; Luma[15] = Y[1];
177 8428 break;
178 75596 case 4:
179 75596 Luma[0] = Y[3]; Luma[1] = Y[3]; Luma[2] = Y[3]; Luma[3] = Y[3];
180 75596 Luma[4] = Y[2]; Luma[5] = Y[2]; Luma[6] = Y[2]; Luma[7] = Y[2];
181 75596 Luma[8] = Y[1]; Luma[9] = Y[1]; Luma[10] = Y[1]; Luma[11] = Y[1];
182 75596 Luma[12] = Y[0]; Luma[13] = Y[0]; Luma[14] = Y[0]; Luma[15] = Y[0];
183 75596 break;
184 7636 case 5:
185 7636 Luma[0] = Y[3]; Luma[1] = Y[3]; Luma[2] = Y[3]; Luma[3] = Y[2];
186 7636 Luma[4] = Y[3]; Luma[5] = Y[2]; Luma[6] = Y[2]; Luma[7] = Y[1];
187 7636 Luma[8] = Y[2]; Luma[9] = Y[1]; Luma[10] = Y[1]; Luma[11] = Y[0];
188 7636 Luma[12] = Y[1]; Luma[13] = Y[0]; Luma[14] = Y[0]; Luma[15] = Y[0];
189 7636 break;
190 10624 case 6:
191 10624 Luma[0] = Y[3]; Luma[1] = Y[3]; Luma[2] = Y[2]; Luma[3] = Y[2];
192 10624 Luma[4] = Y[3]; Luma[5] = Y[2]; Luma[6] = Y[1]; Luma[7] = Y[1];
193 10624 Luma[8] = Y[2]; Luma[9] = Y[2]; Luma[10] = Y[1]; Luma[11] = Y[0];
194 10624 Luma[12] = Y[1]; Luma[13] = Y[1]; Luma[14] = Y[0]; Luma[15] = Y[0];
195 10624 break;
196 4221 case 7:
197 4221 Luma[0] = Y[3]; Luma[1] = Y[3]; Luma[2] = Y[2]; Luma[3] = Y[1];
198 4221 Luma[4] = Y[3]; Luma[5] = Y[2]; Luma[6] = Y[1]; Luma[7] = Y[0];
199 4221 Luma[8] = Y[3]; Luma[9] = Y[2]; Luma[10] = Y[1]; Luma[11] = Y[0];
200 4221 Luma[12] = Y[2]; Luma[13] = Y[1]; Luma[14] = Y[0]; Luma[15] = Y[0];
201 4221 break;
202 ✗ default:
203 ✗ Luma[0] = Y[0]; Luma[1] = Y[0]; Luma[2] = Y[1]; Luma[3] = Y[1];
204 ✗ Luma[4] = Y[0]; Luma[5] = Y[0]; Luma[6] = Y[1]; Luma[7] = Y[1];
205 ✗ Luma[8] = Y[2]; Luma[9] = Y[2]; Luma[10] = Y[3]; Luma[11] = Y[3];
206 ✗ Luma[12] = Y[2]; Luma[13] = Y[2]; Luma[14] = Y[3]; Luma[15] = Y[3];
207 ✗ break;
208 }
209
210 163555 ulti_convert_yuv(frame, x, y, Luma, chroma);
211 163555 }
212
213 62 static int ulti_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
214 int *got_frame, AVPacket *avpkt)
215 {
216 62 const uint8_t *buf = avpkt->data;
217 62 int buf_size = avpkt->size;
218 62 UltimotionDecodeContext *s=avctx->priv_data;
219 62 int modifier = 0;
220 62 int uniq = 0;
221 62 int mode = 0;
222 62 int blocks = 0;
223 62 int done = 0;
224 62 int x = 0, y = 0;
225 int i, ret;
226 int skip;
227 int tmp;
228
229
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 62 if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
230 ✗ return ret;
231
232 62 bytestream2_init(&s->gb, buf, buf_size);
233
234
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 86713 while(!done) {
235 int idx;
236
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 86713 if(blocks >= s->blocks || y >= s->height)
237 break;//all blocks decoded
238
239
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 86651 if (bytestream2_get_bytes_left(&s->gb) < 1)
240 ✗ goto err;
241 86651 idx = bytestream2_get_byteu(&s->gb);
242
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 86651 if((idx & 0xF8) == 0x70) {
243
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 17504 switch(idx) {
244 ✗ case 0x70: //change modifier
245 ✗ modifier = bytestream2_get_byte(&s->gb);
246 ✗ if(modifier>1)
247 ✗ av_log(avctx, AV_LOG_INFO, "warning: modifier must be 0 or 1, got %i\n", modifier);
248 ✗ break;
249 4735 case 0x71: // set uniq flag
250 4735 uniq = 1;
251 4735 break;
252 11510 case 0x72: //toggle mode
253 11510 mode = !mode;
254 11510 break;
255 ✗ case 0x73: //end-of-frame
256 ✗ done = 1;
257 ✗ break;
258 1259 case 0x74: //skip some blocks
259 1259 skip = bytestream2_get_byte(&s->gb);
260
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 1259 if ((blocks + skip) >= s->blocks)
261 ✗ break;
262 1259 blocks += skip;
263 1259 x += skip * 8;
264
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 1616 while(x >= s->width) {
265 357 x -= s->width;
266 357 y += 8;
267 }
268 1259 break;
269 ✗ default:
270 ✗ av_log(avctx, AV_LOG_INFO, "warning: unknown escape 0x%02X\n", idx);
271 }
272 } else { //handle one block
273 int code;
274 int cf;
275 69147 int angle = 0;
276 uint8_t Y[4]; // luma samples of block
277 69147 int tx = 0, ty = 0; //coords of subblock
278 69147 int chroma = 0;
279
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 69147 if (mode || uniq) {
280 28189 uniq = 0;
281 28189 cf = 1;
282 28189 chroma = 0;
283 } else {
284 40958 cf = 0;
285
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 40958 if (idx) {
286 39095 chroma = bytestream2_get_byte(&s->gb);
287 }
288 }
289
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 345735 for (i = 0; i < 4; i++) { // for every subblock
290 276588 code = (idx >> (6 - i*2)) & 3; //extract 2 bits
291
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 276588 if(!code) //skip subblock
292 69893 continue;
293
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 206695 if(cf) {
294 89307 chroma = bytestream2_get_byte(&s->gb);
295 }
296 206695 tx = x + block_coords[i * 2];
297 206695 ty = y + block_coords[(i * 2) + 1];
298
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 206695 switch(code) {
299 36515 case 1:
300 36515 tmp = bytestream2_get_byte(&s->gb);
301
302 36515 angle = angle_by_index[(tmp >> 6) & 0x3];
303
304 36515 Y[0] = tmp & 0x3F;
305 36515 Y[1] = Y[0];
306
307
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 36515 if (angle) {
308 9385 Y[2] = Y[0]+1;
309
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 9385 if (Y[2] > 0x3F)
310 ✗ Y[2] = 0x3F;
311 9385 Y[3] = Y[2];
312 } else {
313 27130 Y[2] = Y[0];
314 27130 Y[3] = Y[0];
315 }
316 36515 break;
317
318 110712 case 2:
319
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 110712 if (modifier) { // unpack four luma samples
320 ✗ tmp = bytestream2_get_be24(&s->gb);
321
322 ✗ Y[0] = (tmp >> 18) & 0x3F;
323 ✗ Y[1] = (tmp >> 12) & 0x3F;
324 ✗ Y[2] = (tmp >> 6) & 0x3F;
325 ✗ Y[3] = tmp & 0x3F;
326 ✗ angle = 16;
327 } else { // retrieve luma samples from codebook
328 110712 tmp = bytestream2_get_be16(&s->gb);
329
330 110712 angle = (tmp >> 12) & 0xF;
331 110712 tmp &= 0xFFF;
332 110712 tmp <<= 2;
333 110712 Y[0] = s->ulti_codebook[tmp];
334 110712 Y[1] = s->ulti_codebook[tmp + 1];
335 110712 Y[2] = s->ulti_codebook[tmp + 2];
336 110712 Y[3] = s->ulti_codebook[tmp + 3];
337 }
338 110712 break;
339
340 59468 case 3:
341
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 59468 if (modifier) { // all 16 luma samples
342 uint8_t Luma[16];
343
344 ✗ if (bytestream2_get_bytes_left(&s->gb) < 12)
345 ✗ goto err;
346 ✗ tmp = bytestream2_get_be24u(&s->gb);
347 ✗ Luma[0] = (tmp >> 18) & 0x3F;
348 ✗ Luma[1] = (tmp >> 12) & 0x3F;
349 ✗ Luma[2] = (tmp >> 6) & 0x3F;
350 ✗ Luma[3] = tmp & 0x3F;
351
352 ✗ tmp = bytestream2_get_be24u(&s->gb);
353 ✗ Luma[4] = (tmp >> 18) & 0x3F;
354 ✗ Luma[5] = (tmp >> 12) & 0x3F;
355 ✗ Luma[6] = (tmp >> 6) & 0x3F;
356 ✗ Luma[7] = tmp & 0x3F;
357
358 ✗ tmp = bytestream2_get_be24u(&s->gb);
359 ✗ Luma[8] = (tmp >> 18) & 0x3F;
360 ✗ Luma[9] = (tmp >> 12) & 0x3F;
361 ✗ Luma[10] = (tmp >> 6) & 0x3F;
362 ✗ Luma[11] = tmp & 0x3F;
363
364 ✗ tmp = bytestream2_get_be24u(&s->gb);
365 ✗ Luma[12] = (tmp >> 18) & 0x3F;
366 ✗ Luma[13] = (tmp >> 12) & 0x3F;
367 ✗ Luma[14] = (tmp >> 6) & 0x3F;
368 ✗ Luma[15] = tmp & 0x3F;
369
370 ✗ ulti_convert_yuv(s->frame, tx, ty, Luma, chroma);
371 } else {
372
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 59468 if (bytestream2_get_bytes_left(&s->gb) < 4)
373 ✗ goto err;
374 59468 tmp = bytestream2_get_byteu(&s->gb);
375
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 59468 if(tmp & 0x80) {
376 16328 angle = (tmp >> 4) & 0x7;
377 16328 tmp = (tmp << 8) + bytestream2_get_byteu(&s->gb);
378 16328 Y[0] = (tmp >> 6) & 0x3F;
379 16328 Y[1] = tmp & 0x3F;
380 16328 Y[2] = bytestream2_get_byteu(&s->gb) & 0x3F;
381 16328 Y[3] = bytestream2_get_byteu(&s->gb) & 0x3F;
382 16328 ulti_grad(s->frame, tx, ty, Y, chroma, angle); //draw block
383 } else { // some patterns
384 43140 int f0 = tmp;
385 43140 int f1 = bytestream2_get_byteu(&s->gb);
386 43140 Y[0] = bytestream2_get_byteu(&s->gb) & 0x3F;
387 43140 Y[1] = bytestream2_get_byteu(&s->gb) & 0x3F;
388 43140 ulti_pattern(s->frame, tx, ty, f0, f1, Y[0], Y[1], chroma);
389 }
390 }
391 59468 break;
392 }
393
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 206695 if(code != 3)
394 147227 ulti_grad(s->frame, tx, ty, Y, chroma, angle); // draw block
395 }
396 69147 blocks++;
397 69147 x += 8;
398
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 69147 if(x >= s->width) {
399 1503 x = 0;
400 1503 y += 8;
401 }
402 }
403 }
404
405 62 *got_frame = 1;
406
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 62 if ((ret = av_frame_ref(rframe, s->frame)) < 0)
407 ✗ return ret;
408
409 62 return buf_size;
410
411 ✗ err:
412 ✗ av_log(avctx, AV_LOG_ERROR,
413 "Insufficient data\n");
414 ✗ return AVERROR_INVALIDDATA;
415 }
416
417 const FFCodec ff_ulti_decoder = {
418 .p.name = "ultimotion",
419 CODEC_LONG_NAME("IBM UltiMotion"),
420 .p.type = AVMEDIA_TYPE_VIDEO,
421 .p.id = AV_CODEC_ID_ULTI,
422 .priv_data_size = sizeof(UltimotionDecodeContext),
423 .init = ulti_decode_init,
424 .close = ulti_decode_end,
425 FF_CODEC_DECODE_CB(ulti_decode_frame),
426 .p.capabilities = AV_CODEC_CAP_DR1,
427 };
428