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ulti.c
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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 <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 
31 #include "avcodec.h"
32 #include "bytestream.h"
33 #include "internal.h"
34 
35 #include "ulti_cb.h"
36 
37 typedef struct UltimotionDecodeContext {
38  AVCodecContext *avctx;
39  int width, height, blocks;
40  AVFrame *frame;
41  const uint8_t *ulti_codebook;
42  GetByteContext gb;
43 } UltimotionDecodeContext;
44 
45 static av_cold int ulti_decode_init(AVCodecContext *avctx)
46 {
47  UltimotionDecodeContext *s = avctx->priv_data;
48 
49  s->avctx = avctx;
50  s->width = avctx->width;
51  s->height = avctx->height;
52  s->blocks = (s->width / 8) * (s->height / 8);
53  avctx->pix_fmt = AV_PIX_FMT_YUV410P;
54  s->ulti_codebook = ulti_codebook;
55 
56  s->frame = av_frame_alloc();
57  if (!s->frame)
58  return AVERROR(ENOMEM);
59 
60  return 0;
61 }
62 
63 static av_cold int ulti_decode_end(AVCodecContext *avctx){
64  UltimotionDecodeContext *s = avctx->priv_data;
65 
66  av_frame_free(&s->frame);
67 
68  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 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  y_plane = frame->data[0] + x + y * frame->linesize[0];
100  cr_plane = frame->data[1] + (x / 4) + (y / 4) * frame->linesize[1];
101  cb_plane = frame->data[2] + (x / 4) + (y / 4) * frame->linesize[2];
102 
103  cr_plane[0] = ulti_chromas[chroma >> 4];
104 
105  cb_plane[0] = ulti_chromas[chroma & 0xF];
106 
107 
108  for(i = 0; i < 16; i++){
109  y_plane[i & 3] = ulti_lumas[luma[i]];
110  if((i & 3) == 3) { //next row
111  y_plane += frame->linesize[0];
112  }
113  }
114 }
115 
116 /* generate block like in MS Video1 */
117 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  for(mask = 0x80, i = 0; mask; mask >>= 1, i++) {
123  if(f0 & mask)
124  Luma[i] = Y1;
125  else
126  Luma[i] = Y0;
127  }
128 
129  for(mask = 0x80, i = 8; mask; mask >>= 1, i++) {
130  if(f1 & mask)
131  Luma[i] = Y1;
132  else
133  Luma[i] = Y0;
134  }
135 
136  ulti_convert_yuv(frame, x, y, Luma, chroma);
137 }
138 
139 /* fill block with some gradient */
140 static void ulti_grad(AVFrame *frame, int x, int y, uint8_t *Y, int chroma, int angle)
141 {
142  uint8_t Luma[16];
143  if(angle & 8) { //reverse order
144  int t;
145  angle &= 0x7;
146  t = Y[0];
147  Y[0] = Y[3];
148  Y[3] = t;
149  t = Y[1];
150  Y[1] = Y[2];
151  Y[2] = t;
152  }
153  switch(angle){
154  case 0:
155  Luma[0] = Y[0]; Luma[1] = Y[1]; Luma[2] = Y[2]; Luma[3] = Y[3];
156  Luma[4] = Y[0]; Luma[5] = Y[1]; Luma[6] = Y[2]; Luma[7] = Y[3];
157  Luma[8] = Y[0]; Luma[9] = Y[1]; Luma[10] = Y[2]; Luma[11] = Y[3];
158  Luma[12] = Y[0]; Luma[13] = Y[1]; Luma[14] = Y[2]; Luma[15] = Y[3];
159  break;
160  case 1:
161  Luma[0] = Y[1]; Luma[1] = Y[2]; Luma[2] = Y[3]; Luma[3] = Y[3];
162  Luma[4] = Y[0]; Luma[5] = Y[1]; Luma[6] = Y[2]; Luma[7] = Y[3];
163  Luma[8] = Y[0]; Luma[9] = Y[1]; Luma[10] = Y[2]; Luma[11] = Y[3];
164  Luma[12] = Y[0]; Luma[13] = Y[0]; Luma[14] = Y[1]; Luma[15] = Y[2];
165  break;
166  case 2:
167  Luma[0] = Y[1]; Luma[1] = Y[2]; Luma[2] = Y[3]; Luma[3] = Y[3];
168  Luma[4] = Y[1]; Luma[5] = Y[2]; Luma[6] = Y[2]; Luma[7] = Y[3];
169  Luma[8] = Y[0]; Luma[9] = Y[1]; Luma[10] = Y[1]; Luma[11] = Y[2];
170  Luma[12] = Y[0]; Luma[13] = Y[0]; Luma[14] = Y[1]; Luma[15] = Y[2];
171  break;
172  case 3:
173  Luma[0] = Y[2]; Luma[1] = Y[3]; Luma[2] = Y[3]; Luma[3] = Y[3];
174  Luma[4] = Y[1]; Luma[5] = Y[2]; Luma[6] = Y[2]; Luma[7] = Y[3];
175  Luma[8] = Y[0]; Luma[9] = Y[1]; Luma[10] = Y[1]; Luma[11] = Y[2];
176  Luma[12] = Y[0]; Luma[13] = Y[0]; Luma[14] = Y[0]; Luma[15] = Y[1];
177  break;
178  case 4:
179  Luma[0] = Y[3]; Luma[1] = Y[3]; Luma[2] = Y[3]; Luma[3] = Y[3];
180  Luma[4] = Y[2]; Luma[5] = Y[2]; Luma[6] = Y[2]; Luma[7] = Y[2];
181  Luma[8] = Y[1]; Luma[9] = Y[1]; Luma[10] = Y[1]; Luma[11] = Y[1];
182  Luma[12] = Y[0]; Luma[13] = Y[0]; Luma[14] = Y[0]; Luma[15] = Y[0];
183  break;
184  case 5:
185  Luma[0] = Y[3]; Luma[1] = Y[3]; Luma[2] = Y[3]; Luma[3] = Y[2];
186  Luma[4] = Y[3]; Luma[5] = Y[2]; Luma[6] = Y[2]; Luma[7] = Y[1];
187  Luma[8] = Y[2]; Luma[9] = Y[1]; Luma[10] = Y[1]; Luma[11] = Y[0];
188  Luma[12] = Y[1]; Luma[13] = Y[0]; Luma[14] = Y[0]; Luma[15] = Y[0];
189  break;
190  case 6:
191  Luma[0] = Y[3]; Luma[1] = Y[3]; Luma[2] = Y[2]; Luma[3] = Y[2];
192  Luma[4] = Y[3]; Luma[5] = Y[2]; Luma[6] = Y[1]; Luma[7] = Y[1];
193  Luma[8] = Y[2]; Luma[9] = Y[2]; Luma[10] = Y[1]; Luma[11] = Y[0];
194  Luma[12] = Y[1]; Luma[13] = Y[1]; Luma[14] = Y[0]; Luma[15] = Y[0];
195  break;
196  case 7:
197  Luma[0] = Y[3]; Luma[1] = Y[3]; Luma[2] = Y[2]; Luma[3] = Y[1];
198  Luma[4] = Y[3]; Luma[5] = Y[2]; Luma[6] = Y[1]; Luma[7] = Y[0];
199  Luma[8] = Y[3]; Luma[9] = Y[2]; Luma[10] = Y[1]; Luma[11] = Y[0];
200  Luma[12] = Y[2]; Luma[13] = Y[1]; Luma[14] = Y[0]; Luma[15] = Y[0];
201  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  ulti_convert_yuv(frame, x, y, Luma, chroma);
211 }
212 
213 static int ulti_decode_frame(AVCodecContext *avctx,
214  void *data, int *got_frame,
215  AVPacket *avpkt)
216 {
217  const uint8_t *buf = avpkt->data;
218  int buf_size = avpkt->size;
219  UltimotionDecodeContext *s=avctx->priv_data;
220  int modifier = 0;
221  int uniq = 0;
222  int mode = 0;
223  int blocks = 0;
224  int done = 0;
225  int x = 0, y = 0;
226  int i, ret;
227  int skip;
228  int tmp;
229 
230  if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
231  return ret;
232 
233  bytestream2_init(&s->gb, buf, buf_size);
234 
235  while(!done) {
236  int idx;
237  if(blocks >= s->blocks || y >= s->height)
238  break;//all blocks decoded
239 
240  if (bytestream2_get_bytes_left(&s->gb) < 1)
241  goto err;
242  idx = bytestream2_get_byteu(&s->gb);
243  if((idx & 0xF8) == 0x70) {
244  switch(idx) {
245  case 0x70: //change modifier
246  modifier = bytestream2_get_byte(&s->gb);
247  if(modifier>1)
248  av_log(avctx, AV_LOG_INFO, "warning: modifier must be 0 or 1, got %i\n", modifier);
249  break;
250  case 0x71: // set uniq flag
251  uniq = 1;
252  break;
253  case 0x72: //toggle mode
254  mode = !mode;
255  break;
256  case 0x73: //end-of-frame
257  done = 1;
258  break;
259  case 0x74: //skip some blocks
260  skip = bytestream2_get_byte(&s->gb);
261  if ((blocks + skip) >= s->blocks)
262  break;
263  blocks += skip;
264  x += skip * 8;
265  while(x >= s->width) {
266  x -= s->width;
267  y += 8;
268  }
269  break;
270  default:
271  av_log(avctx, AV_LOG_INFO, "warning: unknown escape 0x%02X\n", idx);
272  }
273  } else { //handle one block
274  int code;
275  int cf;
276  int angle = 0;
277  uint8_t Y[4]; // luma samples of block
278  int tx = 0, ty = 0; //coords of subblock
279  int chroma = 0;
280  if (mode || uniq) {
281  uniq = 0;
282  cf = 1;
283  chroma = 0;
284  } else {
285  cf = 0;
286  if (idx) {
287  chroma = bytestream2_get_byte(&s->gb);
288  }
289  }
290  for (i = 0; i < 4; i++) { // for every subblock
291  code = (idx >> (6 - i*2)) & 3; //extract 2 bits
292  if(!code) //skip subblock
293  continue;
294  if(cf) {
295  chroma = bytestream2_get_byte(&s->gb);
296  }
297  tx = x + block_coords[i * 2];
298  ty = y + block_coords[(i * 2) + 1];
299  switch(code) {
300  case 1:
301  tmp = bytestream2_get_byte(&s->gb);
302 
303  angle = angle_by_index[(tmp >> 6) & 0x3];
304 
305  Y[0] = tmp & 0x3F;
306  Y[1] = Y[0];
307 
308  if (angle) {
309  Y[2] = Y[0]+1;
310  if (Y[2] > 0x3F)
311  Y[2] = 0x3F;
312  Y[3] = Y[2];
313  } else {
314  Y[2] = Y[0];
315  Y[3] = Y[0];
316  }
317  break;
318 
319  case 2:
320  if (modifier) { // unpack four luma samples
321  tmp = bytestream2_get_be24(&s->gb);
322 
323  Y[0] = (tmp >> 18) & 0x3F;
324  Y[1] = (tmp >> 12) & 0x3F;
325  Y[2] = (tmp >> 6) & 0x3F;
326  Y[3] = tmp & 0x3F;
327  angle = 16;
328  } else { // retrieve luma samples from codebook
329  tmp = bytestream2_get_be16(&s->gb);
330 
331  angle = (tmp >> 12) & 0xF;
332  tmp &= 0xFFF;
333  tmp <<= 2;
334  Y[0] = s->ulti_codebook[tmp];
335  Y[1] = s->ulti_codebook[tmp + 1];
336  Y[2] = s->ulti_codebook[tmp + 2];
337  Y[3] = s->ulti_codebook[tmp + 3];
338  }
339  break;
340 
341  case 3:
342  if (modifier) { // all 16 luma samples
343  uint8_t Luma[16];
344 
345  if (bytestream2_get_bytes_left(&s->gb) < 12)
346  goto err;
347  tmp = bytestream2_get_be24u(&s->gb);
348  Luma[0] = (tmp >> 18) & 0x3F;
349  Luma[1] = (tmp >> 12) & 0x3F;
350  Luma[2] = (tmp >> 6) & 0x3F;
351  Luma[3] = tmp & 0x3F;
352 
353  tmp = bytestream2_get_be24u(&s->gb);
354  Luma[4] = (tmp >> 18) & 0x3F;
355  Luma[5] = (tmp >> 12) & 0x3F;
356  Luma[6] = (tmp >> 6) & 0x3F;
357  Luma[7] = tmp & 0x3F;
358 
359  tmp = bytestream2_get_be24u(&s->gb);
360  Luma[8] = (tmp >> 18) & 0x3F;
361  Luma[9] = (tmp >> 12) & 0x3F;
362  Luma[10] = (tmp >> 6) & 0x3F;
363  Luma[11] = tmp & 0x3F;
364 
365  tmp = bytestream2_get_be24u(&s->gb);
366  Luma[12] = (tmp >> 18) & 0x3F;
367  Luma[13] = (tmp >> 12) & 0x3F;
368  Luma[14] = (tmp >> 6) & 0x3F;
369  Luma[15] = tmp & 0x3F;
370 
371  ulti_convert_yuv(s->frame, tx, ty, Luma, chroma);
372  } else {
373  if (bytestream2_get_bytes_left(&s->gb) < 4)
374  goto err;
375  tmp = bytestream2_get_byteu(&s->gb);
376  if(tmp & 0x80) {
377  angle = (tmp >> 4) & 0x7;
378  tmp = (tmp << 8) + bytestream2_get_byteu(&s->gb);
379  Y[0] = (tmp >> 6) & 0x3F;
380  Y[1] = tmp & 0x3F;
381  Y[2] = bytestream2_get_byteu(&s->gb) & 0x3F;
382  Y[3] = bytestream2_get_byteu(&s->gb) & 0x3F;
383  ulti_grad(s->frame, tx, ty, Y, chroma, angle); //draw block
384  } else { // some patterns
385  int f0 = tmp;
386  int f1 = bytestream2_get_byteu(&s->gb);
387  Y[0] = bytestream2_get_byteu(&s->gb) & 0x3F;
388  Y[1] = bytestream2_get_byteu(&s->gb) & 0x3F;
389  ulti_pattern(s->frame, tx, ty, f0, f1, Y[0], Y[1], chroma);
390  }
391  }
392  break;
393  }
394  if(code != 3)
395  ulti_grad(s->frame, tx, ty, Y, chroma, angle); // draw block
396  }
397  blocks++;
398  x += 8;
399  if(x >= s->width) {
400  x = 0;
401  y += 8;
402  }
403  }
404  }
405 
406  *got_frame = 1;
407  if ((ret = av_frame_ref(data, s->frame)) < 0)
408  return ret;
409 
410  return buf_size;
411 
412 err:
413  av_log(avctx, AV_LOG_ERROR,
414  "Insufficient data\n");
415  return AVERROR_INVALIDDATA;
416 }
417 
418 AVCodec ff_ulti_decoder = {
419  .name = "ultimotion",
420  .long_name = NULL_IF_CONFIG_SMALL("IBM UltiMotion"),
421  .type = AVMEDIA_TYPE_VIDEO,
422  .id = AV_CODEC_ID_ULTI,
423  .priv_data_size = sizeof(UltimotionDecodeContext),
424  .init = ulti_decode_init,
425  .close = ulti_decode_end,
426  .decode = ulti_decode_frame,
427  .capabilities = CODEC_CAP_DR1,
428 };
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