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1/*
2 * IBM Ultimotion Video Decoder
3 * Copyright (C) 2004 Konstantin Shishkov
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 */
20
21/**
22 * @file ulti.c
23 * IBM Ultimotion Video Decoder.
24 */
25
26#include <stdio.h>
27#include <stdlib.h>
28#include <string.h>
29#include <unistd.h>
30
31#include "common.h"
32#include "avcodec.h"
33
34#include "ulti_cb.h"
35
36typedef struct UltimotionDecodeContext {
37 AVCodecContext *avctx;
38 int width, height, blocks;
39 AVFrame frame;
40 const uint8_t *ulti_codebook;
41} UltimotionDecodeContext;
42
43static int ulti_decode_init(AVCodecContext *avctx)
44{
45 UltimotionDecodeContext *s = avctx->priv_data;
46
47 s->avctx = avctx;
48 s->width = avctx->width;
49 s->height = avctx->height;
50 s->blocks = (s->width / 8) * (s->height / 8);
51 avctx->pix_fmt = PIX_FMT_YUV410P;
52 avctx->has_b_frames = 0;
53 avctx->coded_frame = (AVFrame*) &s->frame;
54 s->ulti_codebook = ulti_codebook;
55
56 return 0;
57}
58
59static int block_coords[8] = // 4x4 block coords in 8x8 superblock
60 { 0, 0, 0, 4, 4, 4, 4, 0};
61
62static int angle_by_index[4] = { 0, 2, 6, 12};
63
64/* Lookup tables for luma and chroma - used by ulti_convert_yuv() */
65static uint8_t ulti_lumas[64] =
66 { 0x10, 0x13, 0x17, 0x1A, 0x1E, 0x21, 0x25, 0x28,
67 0x2C, 0x2F, 0x33, 0x36, 0x3A, 0x3D, 0x41, 0x44,
68 0x48, 0x4B, 0x4F, 0x52, 0x56, 0x59, 0x5C, 0x60,
69 0x63, 0x67, 0x6A, 0x6E, 0x71, 0x75, 0x78, 0x7C,
70 0x7F, 0x83, 0x86, 0x8A, 0x8D, 0x91, 0x94, 0x98,
71 0x9B, 0x9F, 0xA2, 0xA5, 0xA9, 0xAC, 0xB0, 0xB3,
72 0xB7, 0xBA, 0xBE, 0xC1, 0xC5, 0xC8, 0xCC, 0xCF,
73 0xD3, 0xD6, 0xDA, 0xDD, 0xE1, 0xE4, 0xE8, 0xEB};
74
75static uint8_t ulti_chromas[16] =
76 { 0x60, 0x67, 0x6D, 0x73, 0x7A, 0x80, 0x86, 0x8D,
77 0x93, 0x99, 0xA0, 0xA6, 0xAC, 0xB3, 0xB9, 0xC0};
78
79/* convert Ultimotion YUV block (sixteen 6-bit Y samples and
80 two 4-bit chroma samples) into standard YUV and put it into frame */
81static void ulti_convert_yuv(AVFrame *frame, int x, int y,
82 uint8_t *luma,int chroma)
83{
84 uint8_t *y_plane, *cr_plane, *cb_plane;
85 int i;
86
87 y_plane = frame->data[0] + x + y * frame->linesize[0];
88 cr_plane = frame->data[1] + (x / 4) + (y / 4) * frame->linesize[1];
89 cb_plane = frame->data[2] + (x / 4) + (y / 4) * frame->linesize[2];
90
91 cr_plane[0] = ulti_chromas[chroma >> 4];
92
93 cb_plane[0] = ulti_chromas[chroma & 0xF];
94
95
96 for(i = 0; i < 16; i++){
97 y_plane[i & 3] = ulti_lumas[luma[i]];
98 if((i & 3) == 3) { //next row
99 y_plane += frame->linesize[0];
100 }
101 }
102}
103
104/* generate block like in MS Video1 */
105static void ulti_pattern(AVFrame *frame, int x, int y,
106 int f0, int f1, int Y0, int Y1, int chroma)
107{
108 uint8_t Luma[16];
109 int mask, i;
110 for(mask = 0x80, i = 0; mask; mask >>= 1, i++) {
111 if(f0 & mask)
112 Luma[i] = Y1;
113 else
114 Luma[i] = Y0;
115 }
116
117 for(mask = 0x80, i = 8; mask; mask >>= 1, i++) {
118 if(f1 & mask)
119 Luma[i] = Y1;
120 else
121 Luma[i] = Y0;
122 }
123
124 ulti_convert_yuv(frame, x, y, Luma, chroma);
125}
126
127/* fill block with some gradient */
128static void ulti_grad(AVFrame *frame, int x, int y, uint8_t *Y, int chroma, int angle)
129{
130 uint8_t Luma[16];
131 if(angle & 8) { //reverse order
132 int t;
133 angle &= 0x7;
134 t = Y[0];
135 Y[0] = Y[3];
136 Y[3] = t;
137 t = Y[1];
138 Y[1] = Y[2];
139 Y[2] = t;
140 }
141 switch(angle){
142 case 0:
143 Luma[0] = Y[0]; Luma[1] = Y[1]; Luma[2] = Y[2]; Luma[3] = Y[3];
144 Luma[4] = Y[0]; Luma[5] = Y[1]; Luma[6] = Y[2]; Luma[7] = Y[3];
145 Luma[8] = Y[0]; Luma[9] = Y[1]; Luma[10] = Y[2]; Luma[11] = Y[3];
146 Luma[12] = Y[0]; Luma[13] = Y[1]; Luma[14] = Y[2]; Luma[15] = Y[3];
147 break;
148 case 1:
149 Luma[0] = Y[1]; Luma[1] = Y[2]; Luma[2] = Y[3]; Luma[3] = Y[3];
150 Luma[4] = Y[0]; Luma[5] = Y[1]; Luma[6] = Y[2]; Luma[7] = Y[3];
151 Luma[8] = Y[0]; Luma[9] = Y[1]; Luma[10] = Y[2]; Luma[11] = Y[3];
152 Luma[12] = Y[0]; Luma[13] = Y[0]; Luma[14] = Y[1]; Luma[15] = Y[2];
153 break;
154 case 2:
155 Luma[0] = Y[1]; Luma[1] = Y[2]; Luma[2] = Y[3]; Luma[3] = Y[3];
156 Luma[4] = Y[1]; Luma[5] = Y[2]; Luma[6] = Y[2]; Luma[7] = Y[3];
157 Luma[8] = Y[0]; Luma[9] = Y[1]; Luma[10] = Y[1]; Luma[11] = Y[2];
158 Luma[12] = Y[0]; Luma[13] = Y[0]; Luma[14] = Y[1]; Luma[15] = Y[2];
159 break;
160 case 3:
161 Luma[0] = Y[2]; Luma[1] = Y[3]; Luma[2] = Y[3]; Luma[3] = Y[3];
162 Luma[4] = Y[1]; Luma[5] = Y[2]; Luma[6] = Y[2]; Luma[7] = Y[3];
163 Luma[8] = Y[0]; Luma[9] = Y[1]; Luma[10] = Y[1]; Luma[11] = Y[2];
164 Luma[12] = Y[0]; Luma[13] = Y[0]; Luma[14] = Y[0]; Luma[15] = Y[1];
165 break;
166 case 4:
167 Luma[0] = Y[3]; Luma[1] = Y[3]; Luma[2] = Y[3]; Luma[3] = Y[3];
168 Luma[4] = Y[2]; Luma[5] = Y[2]; Luma[6] = Y[2]; Luma[7] = Y[2];
169 Luma[8] = Y[1]; Luma[9] = Y[1]; Luma[10] = Y[1]; Luma[11] = Y[1];
170 Luma[12] = Y[0]; Luma[13] = Y[0]; Luma[14] = Y[0]; Luma[15] = Y[0];
171 break;
172 case 5:
173 Luma[0] = Y[3]; Luma[1] = Y[3]; Luma[2] = Y[3]; Luma[3] = Y[2];
174 Luma[4] = Y[3]; Luma[5] = Y[2]; Luma[6] = Y[2]; Luma[7] = Y[1];
175 Luma[8] = Y[2]; Luma[9] = Y[1]; Luma[10] = Y[1]; Luma[11] = Y[0];
176 Luma[12] = Y[1]; Luma[13] = Y[0]; Luma[14] = Y[0]; Luma[15] = Y[0];
177 break;
178 case 6:
179 Luma[0] = Y[3]; Luma[1] = Y[3]; Luma[2] = Y[2]; Luma[3] = Y[2];
180 Luma[4] = Y[3]; Luma[5] = Y[2]; Luma[6] = Y[1]; Luma[7] = Y[1];
181 Luma[8] = Y[2]; Luma[9] = Y[2]; Luma[10] = Y[1]; Luma[11] = Y[0];
182 Luma[12] = Y[1]; Luma[13] = Y[1]; Luma[14] = Y[0]; Luma[15] = Y[0];
183 break;
184 case 7:
185 Luma[0] = Y[3]; Luma[1] = Y[3]; Luma[2] = Y[2]; Luma[3] = Y[1];
186 Luma[4] = Y[3]; Luma[5] = Y[2]; Luma[6] = Y[1]; Luma[7] = Y[0];
187 Luma[8] = Y[3]; Luma[9] = Y[2]; Luma[10] = Y[1]; Luma[11] = Y[0];
188 Luma[12] = Y[2]; Luma[13] = Y[1]; Luma[14] = Y[0]; Luma[15] = Y[0];
189 break;
190 default:
191 Luma[0] = Y[0]; Luma[1] = Y[0]; Luma[2] = Y[1]; Luma[3] = Y[1];
192 Luma[4] = Y[0]; Luma[5] = Y[0]; Luma[6] = Y[1]; Luma[7] = Y[1];
193 Luma[8] = Y[2]; Luma[9] = Y[2]; Luma[10] = Y[3]; Luma[11] = Y[3];
194 Luma[12] = Y[2]; Luma[13] = Y[2]; Luma[14] = Y[3]; Luma[15] = Y[3];
195 break;
196 }
197
198 ulti_convert_yuv(frame, x, y, Luma, chroma);
199}
200
201static int ulti_decode_frame(AVCodecContext *avctx,
202 void *data, int *data_size,
203 uint8_t *buf, int buf_size)
204{
205 UltimotionDecodeContext *s=avctx->priv_data;
206 int modifier = 0;
207 int uniq = 0;
208 int mode = 0;
209 int blocks = 0;
210 int done = 0;
211 int x = 0, y = 0;
212 int i;
213 int skip;
214 int tmp;
215
216 if(s->frame.data[0])
217 avctx->release_buffer(avctx, &s->frame);
218
219 s->frame.reference = 1;
220 s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
221 if(avctx->get_buffer(avctx, &s->frame) < 0) {
222 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
223 return -1;
224 }
225
226 while(!done) {
227 int idx;
228 if(blocks >= s->blocks || y >= s->height)
229 break;//all blocks decoded
230
231 idx = *buf++;
232 if((idx & 0xF8) == 0x70) {
233 switch(idx) {
234 case 0x70: //change modifier
235 modifier = *buf++;
236 if(modifier>1)
237 av_log(avctx, AV_LOG_INFO, "warning: modifier must be 0 or 1, got %i\n", modifier);
238 break;
239 case 0x71: // set uniq flag
240 uniq = 1;
241 break;
242 case 0x72: //toggle mode
243 mode = !mode;
244 break;
245 case 0x73: //end-of-frame
246 done = 1;
247 break;
248 case 0x74: //skip some blocks
249 skip = *buf++;
250 if ((blocks + skip) >= s->blocks)
251 break;
252 blocks += skip;
253 x += skip * 8;
254 while(x >= s->width) {
255 x -= s->width;
256 y += 8;
257 }
258 break;
259 default:
260 av_log(avctx, AV_LOG_INFO, "warning: unknown escape 0x%02X\n", idx);
261 }
262 } else { //handle one block
263 int code;
264 int cf;
265 int angle = 0;
266 uint8_t Y[4]; // luma samples of block
267 int tx = 0, ty = 0; //coords of subblock
268 int chroma = 0;
269 if (mode || uniq) {
270 uniq = 0;
271 cf = 1;
272 chroma = 0;
273 } else {
274 cf = 0;
275 if (idx)
276 chroma = *buf++;
277 }
278 for (i = 0; i < 4; i++) { // for every subblock
279 code = (idx >> (6 - i*2)) & 3; //extract 2 bits
280 if(!code) //skip subblock
281 continue;
282 if(cf)
283 chroma = *buf++;
284 tx = x + block_coords[i * 2];
285 ty = y + block_coords[(i * 2) + 1];
286 switch(code) {
287 case 1:
288 tmp = *buf++;
289
290 angle = angle_by_index[(tmp >> 6) & 0x3];
291
292 Y[0] = tmp & 0x3F;
293 Y[1] = Y[0];
294
295 if (angle) {
296 Y[2] = Y[0]+1;
297 if (Y[2] > 0x3F)
298 Y[2] = 0x3F;
299 Y[3] = Y[2];
300 } else {
301 Y[2] = Y[0];
302 Y[3] = Y[0];
303 }
304 break;
305
306 case 2:
307 if (modifier) { // unpack four luma samples
308 tmp = (*buf++) << 16;
309 tmp += (*buf++) << 8;
310 tmp += *buf++;
311
312 Y[0] = (tmp >> 18) & 0x3F;
313 Y[1] = (tmp >> 12) & 0x3F;
314 Y[2] = (tmp >> 6) & 0x3F;
315 Y[3] = tmp & 0x3F;
316 angle = 16;
317 } else { // retrieve luma samples from codebook
318 tmp = (*buf++) << 8;
319 tmp += (*buf++);
320
321 angle = (tmp >> 12) & 0xF;
322 tmp &= 0xFFF;
323 tmp <<= 2;
324 Y[0] = s->ulti_codebook[tmp];
325 Y[1] = s->ulti_codebook[tmp + 1];
326 Y[2] = s->ulti_codebook[tmp + 2];
327 Y[3] = s->ulti_codebook[tmp + 3];
328 }
329 break;
330
331 case 3:
332 if (modifier) { // all 16 luma samples
333 uint8_t Luma[16];
334
335 tmp = (*buf++) << 16;
336 tmp += (*buf++) << 8;
337 tmp += *buf++;
338 Luma[0] = (tmp >> 18) & 0x3F;
339 Luma[1] = (tmp >> 12) & 0x3F;
340 Luma[2] = (tmp >> 6) & 0x3F;
341 Luma[3] = tmp & 0x3F;
342
343 tmp = (*buf++) << 16;
344 tmp += (*buf++) << 8;
345 tmp += *buf++;
346 Luma[4] = (tmp >> 18) & 0x3F;
347 Luma[5] = (tmp >> 12) & 0x3F;
348 Luma[6] = (tmp >> 6) & 0x3F;
349 Luma[7] = tmp & 0x3F;
350
351 tmp = (*buf++) << 16;
352 tmp += (*buf++) << 8;
353 tmp += *buf++;
354 Luma[8] = (tmp >> 18) & 0x3F;
355 Luma[9] = (tmp >> 12) & 0x3F;
356 Luma[10] = (tmp >> 6) & 0x3F;
357 Luma[11] = tmp & 0x3F;
358
359 tmp = (*buf++) << 16;
360 tmp += (*buf++) << 8;
361 tmp += *buf++;
362 Luma[12] = (tmp >> 18) & 0x3F;
363 Luma[13] = (tmp >> 12) & 0x3F;
364 Luma[14] = (tmp >> 6) & 0x3F;
365 Luma[15] = tmp & 0x3F;
366
367 ulti_convert_yuv(&s->frame, tx, ty, Luma, chroma);
368 } else {
369 tmp = *buf++;
370 if(tmp & 0x80) {
371 angle = (tmp >> 4) & 0x7;
372 tmp = (tmp << 8) + *buf++;
373 Y[0] = (tmp >> 6) & 0x3F;
374 Y[1] = tmp & 0x3F;
375 Y[2] = (*buf++) & 0x3F;
376 Y[3] = (*buf++) & 0x3F;
377 ulti_grad(&s->frame, tx, ty, Y, chroma, angle); //draw block
378 } else { // some patterns
379 int f0, f1;
380 f0 = *buf++;
381 f1 = tmp;
382 Y[0] = (*buf++) & 0x3F;
383 Y[1] = (*buf++) & 0x3F;
384 ulti_pattern(&s->frame, tx, ty, f1, f0, Y[0], Y[1], chroma);
385 }
386 }
387 break;
388 }
389 if(code != 3)
390 ulti_grad(&s->frame, tx, ty, Y, chroma, angle); // draw block
391 }
392 blocks++;
393 x += 8;
394 if(x >= s->width) {
395 x = 0;
396 y += 8;
397 }
398 }
399 }
400
401 *data_size=sizeof(AVFrame);
402 *(AVFrame*)data= s->frame;
403
404 return buf_size;
405}
406
407static int ulti_decode_end(AVCodecContext *avctx)
408{
409/* UltimotionDecodeContext *s = avctx->priv_data;*/
410
411 return 0;
412}
413
414AVCodec ulti_decoder = {
415 "ultimotion",
416 CODEC_TYPE_VIDEO,
417 CODEC_ID_ULTI,
418 sizeof(UltimotionDecodeContext),
419 ulti_decode_init,
420 NULL,
421 ulti_decode_end,
422 ulti_decode_frame,
423 CODEC_CAP_DR1,
424 NULL
425};
426
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