() 10l
[libav.git] / libavcodec / roqvideo.c
CommitLineData
3ef8be2b
MM
1/*
2 * Copyright (C) 2003 the ffmpeg project
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the Free Software
5509bffa 16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
3ef8be2b
MM
17 *
18 */
19
20/**
21 * @file roqvideo.c
22 * Id RoQ Video Decoder by Dr. Tim Ferguson
23 * For more information about the Id RoQ format, visit:
24 * http://www.csse.monash.edu.au/~timf/
25 */
26
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
30#include <unistd.h>
31
32#include "common.h"
33#include "avcodec.h"
34#include "dsputil.h"
35
36typedef struct {
37 unsigned char y0, y1, y2, y3, u, v;
38} roq_cell;
39
40typedef struct {
41 int idx[4];
42} roq_qcell;
43
ec59fd53
MM
44static int uiclip[1024], *uiclp; /* clipping table */
45#define avg2(a,b) uiclp[(((int)(a)+(int)(b)+1)>>1)]
46#define avg4(a,b,c,d) uiclp[(((int)(a)+(int)(b)+(int)(c)+(int)(d)+2)>>2)]
3ef8be2b
MM
47
48typedef struct RoqContext {
49
50 AVCodecContext *avctx;
51 DSPContext dsp;
52 AVFrame last_frame;
53 AVFrame current_frame;
54 int first_frame;
55 int y_stride;
56 int c_stride;
57
58 roq_cell cells[256];
59 roq_qcell qcells[256];
60
61 unsigned char *buf;
62 int size;
63
64} RoqContext;
65
66#define RoQ_INFO 0x1001
67#define RoQ_QUAD_CODEBOOK 0x1002
68#define RoQ_QUAD_VQ 0x1011
69#define RoQ_SOUND_MONO 0x1020
70#define RoQ_SOUND_STEREO 0x1021
71
72#define RoQ_ID_MOT 0x00
73#define RoQ_ID_FCC 0x01
74#define RoQ_ID_SLD 0x02
75#define RoQ_ID_CCC 0x03
76
77#define get_byte(in_buffer) *(in_buffer++)
78#define get_word(in_buffer) ((unsigned short)(in_buffer += 2, \
79 (in_buffer[-1] << 8 | in_buffer[-2])))
80#define get_long(in_buffer) ((unsigned long)(in_buffer += 4, \
81 (in_buffer[-1] << 24 | in_buffer[-2] << 16 | in_buffer[-3] << 8 | in_buffer[-4])))
82
83
84static void apply_vector_2x2(RoqContext *ri, int x, int y, roq_cell *cell)
85{
86 unsigned char *yptr;
87
88 yptr = ri->current_frame.data[0] + (y * ri->y_stride) + x;
89 *yptr++ = cell->y0;
90 *yptr++ = cell->y1;
91 yptr += (ri->y_stride - 2);
92 *yptr++ = cell->y2;
93 *yptr++ = cell->y3;
94 ri->current_frame.data[1][(y/2) * (ri->c_stride) + x/2] = cell->u;
95 ri->current_frame.data[2][(y/2) * (ri->c_stride) + x/2] = cell->v;
96}
97
98static void apply_vector_4x4(RoqContext *ri, int x, int y, roq_cell *cell)
99{
100 unsigned long row_inc, c_row_inc;
101 register unsigned char y0, y1, u, v;
102 unsigned char *yptr, *uptr, *vptr;
103
104 yptr = ri->current_frame.data[0] + (y * ri->y_stride) + x;
105 uptr = ri->current_frame.data[1] + (y/2) * (ri->c_stride) + x/2;
106 vptr = ri->current_frame.data[2] + (y/2) * (ri->c_stride) + x/2;
107
108 row_inc = ri->y_stride - 4;
109 c_row_inc = (ri->c_stride) - 2;
110 *yptr++ = y0 = cell->y0; *uptr++ = u = cell->u; *vptr++ = v = cell->v;
111 *yptr++ = y0;
112 *yptr++ = y1 = cell->y1; *uptr++ = u; *vptr++ = v;
113 *yptr++ = y1;
114
115 yptr += row_inc;
116
117 *yptr++ = y0;
118 *yptr++ = y0;
119 *yptr++ = y1;
120 *yptr++ = y1;
121
122 yptr += row_inc; uptr += c_row_inc; vptr += c_row_inc;
123
124 *yptr++ = y0 = cell->y2; *uptr++ = u; *vptr++ = v;
125 *yptr++ = y0;
126 *yptr++ = y1 = cell->y3; *uptr++ = u; *vptr++ = v;
127 *yptr++ = y1;
128
129 yptr += row_inc;
130
131 *yptr++ = y0;
132 *yptr++ = y0;
133 *yptr++ = y1;
134 *yptr++ = y1;
135}
136
137static void apply_motion_4x4(RoqContext *ri, int x, int y, unsigned char mv,
ec59fd53 138 signed char mean_x, signed char mean_y)
3ef8be2b 139{
ec59fd53 140 int i, hw, mx, my;
3ef8be2b
MM
141 unsigned char *pa, *pb;
142
143 mx = x + 8 - (mv >> 4) - mean_x;
144 my = y + 8 - (mv & 0xf) - mean_y;
145
b9029997
MM
146 /* check MV against frame boundaries */
147 if ((mx < 0) || (mx > ri->avctx->width - 4) ||
148 (my < 0) || (my > ri->avctx->height - 4)) {
149 av_log(ri->avctx, AV_LOG_ERROR, "motion vector out of bounds: MV = (%d, %d), boundaries = (0, 0, %d, %d)\n",
150 mx, my, ri->avctx->width, ri->avctx->height);
151 return;
152 }
153
3ef8be2b
MM
154 pa = ri->current_frame.data[0] + (y * ri->y_stride) + x;
155 pb = ri->last_frame.data[0] + (my * ri->y_stride) + mx;
156 for(i = 0; i < 4; i++) {
157 pa[0] = pb[0];
158 pa[1] = pb[1];
159 pa[2] = pb[2];
160 pa[3] = pb[3];
161 pa += ri->y_stride;
162 pb += ri->y_stride;
163 }
164
ec59fd53
MM
165 hw = ri->y_stride/2;
166 pa = ri->current_frame.data[1] + (y * ri->y_stride)/4 + x/2;
167 pb = ri->last_frame.data[1] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
168
169 for(i = 0; i < 2; i++) {
170 switch(((my & 0x01) << 1) | (mx & 0x01)) {
171
172 case 0:
173 pa[0] = pb[0];
174 pa[1] = pb[1];
175 pa[hw] = pb[hw];
176 pa[hw+1] = pb[hw+1];
177 break;
178
179 case 1:
180 pa[0] = avg2(pb[0], pb[1]);
181 pa[1] = avg2(pb[1], pb[2]);
182 pa[hw] = avg2(pb[hw], pb[hw+1]);
183 pa[hw+1] = avg2(pb[hw+1], pb[hw+2]);
184 break;
185
186 case 2:
187 pa[0] = avg2(pb[0], pb[hw]);
188 pa[1] = avg2(pb[1], pb[hw+1]);
189 pa[hw] = avg2(pb[hw], pb[hw*2]);
190 pa[hw+1] = avg2(pb[hw+1], pb[(hw*2)+1]);
191 break;
192
193 case 3:
194 pa[0] = avg4(pb[0], pb[1], pb[hw], pb[hw+1]);
195 pa[1] = avg4(pb[1], pb[2], pb[hw+1], pb[hw+2]);
196 pa[hw] = avg4(pb[hw], pb[hw+1], pb[hw*2], pb[(hw*2)+1]);
197 pa[hw+1] = avg4(pb[hw+1], pb[hw+2], pb[(hw*2)+1], pb[(hw*2)+1]);
198 break;
199 }
200
201 pa = ri->current_frame.data[2] + (y * ri->y_stride)/4 + x/2;
202 pb = ri->last_frame.data[2] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
203 }
3ef8be2b
MM
204}
205
206static void apply_motion_8x8(RoqContext *ri, int x, int y,
ec59fd53 207 unsigned char mv, signed char mean_x, signed char mean_y)
3ef8be2b 208{
ec59fd53 209 int mx, my, i, j, hw;
3ef8be2b
MM
210 unsigned char *pa, *pb;
211
212 mx = x + 8 - (mv >> 4) - mean_x;
213 my = y + 8 - (mv & 0xf) - mean_y;
214
b9029997
MM
215 /* check MV against frame boundaries */
216 if ((mx < 0) || (mx > ri->avctx->width - 8) ||
217 (my < 0) || (my > ri->avctx->height - 8)) {
218 av_log(ri->avctx, AV_LOG_ERROR, "motion vector out of bounds: MV = (%d, %d), boundaries = (0, 0, %d, %d)\n",
219 mx, my, ri->avctx->width, ri->avctx->height);
220 return;
221 }
222
3ef8be2b
MM
223 pa = ri->current_frame.data[0] + (y * ri->y_stride) + x;
224 pb = ri->last_frame.data[0] + (my * ri->y_stride) + mx;
225 for(i = 0; i < 8; i++) {
226 pa[0] = pb[0];
227 pa[1] = pb[1];
228 pa[2] = pb[2];
229 pa[3] = pb[3];
230 pa[4] = pb[4];
231 pa[5] = pb[5];
232 pa[6] = pb[6];
233 pa[7] = pb[7];
234 pa += ri->y_stride;
235 pb += ri->y_stride;
236 }
237
ec59fd53
MM
238 hw = ri->c_stride;
239 pa = ri->current_frame.data[1] + (y * ri->y_stride)/4 + x/2;
240 pb = ri->last_frame.data[1] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
241 for(j = 0; j < 2; j++) {
242 for(i = 0; i < 4; i++) {
243 switch(((my & 0x01) << 1) | (mx & 0x01)) {
244
245 case 0:
246 pa[0] = pb[0];
247 pa[1] = pb[1];
248 pa[2] = pb[2];
249 pa[3] = pb[3];
250 break;
251
252 case 1:
253 pa[0] = avg2(pb[0], pb[1]);
254 pa[1] = avg2(pb[1], pb[2]);
255 pa[2] = avg2(pb[2], pb[3]);
256 pa[3] = avg2(pb[3], pb[4]);
257 break;
115329f1 258
ec59fd53
MM
259 case 2:
260 pa[0] = avg2(pb[0], pb[hw]);
261 pa[1] = avg2(pb[1], pb[hw+1]);
262 pa[2] = avg2(pb[2], pb[hw+2]);
263 pa[3] = avg2(pb[3], pb[hw+3]);
264 break;
265
266 case 3:
267 pa[0] = avg4(pb[0], pb[1], pb[hw], pb[hw+1]);
268 pa[1] = avg4(pb[1], pb[2], pb[hw+1], pb[hw+2]);
269 pa[2] = avg4(pb[2], pb[3], pb[hw+2], pb[hw+3]);
270 pa[3] = avg4(pb[3], pb[4], pb[hw+3], pb[hw+4]);
271 break;
272 }
273 pa += ri->c_stride;
274 pb += ri->c_stride;
275 }
276
277 pa = ri->current_frame.data[2] + (y * ri->y_stride)/4 + x/2;
278 pb = ri->last_frame.data[2] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
279 }
3ef8be2b
MM
280}
281
282static void roqvideo_decode_frame(RoqContext *ri)
283{
284 unsigned int chunk_id = 0, chunk_arg = 0;
285 unsigned long chunk_size = 0;
286 int i, j, k, nv1, nv2, vqflg = 0, vqflg_pos = -1;
287 int vqid, bpos, xpos, ypos, xp, yp, x, y;
288 int frame_stats[2][4] = {{0},{0}};
289 roq_qcell *qcell;
290 unsigned char *buf = ri->buf;
291 unsigned char *buf_end = ri->buf + ri->size;
292
293 while (buf < buf_end) {
294 chunk_id = get_word(buf);
295 chunk_size = get_long(buf);
296 chunk_arg = get_word(buf);
297
298 if(chunk_id == RoQ_QUAD_VQ)
299 break;
300 if(chunk_id == RoQ_QUAD_CODEBOOK) {
301 if((nv1 = chunk_arg >> 8) == 0)
302 nv1 = 256;
303 if((nv2 = chunk_arg & 0xff) == 0 && nv1 * 6 < chunk_size)
304 nv2 = 256;
305 for(i = 0; i < nv1; i++) {
306 ri->cells[i].y0 = get_byte(buf);
307 ri->cells[i].y1 = get_byte(buf);
308 ri->cells[i].y2 = get_byte(buf);
309 ri->cells[i].y3 = get_byte(buf);
310 ri->cells[i].u = get_byte(buf);
311 ri->cells[i].v = get_byte(buf);
312 }
313 for(i = 0; i < nv2; i++)
314 for(j = 0; j < 4; j++)
315 ri->qcells[i].idx[j] = get_byte(buf);
316 }
317 }
318
319 bpos = xpos = ypos = 0;
320 while(bpos < chunk_size) {
321 for (yp = ypos; yp < ypos + 16; yp += 8)
322 for (xp = xpos; xp < xpos + 16; xp += 8) {
323 if (vqflg_pos < 0) {
324 vqflg = buf[bpos++]; vqflg |= (buf[bpos++] << 8);
325 vqflg_pos = 7;
326 }
327 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
328 frame_stats[0][vqid]++;
329 vqflg_pos--;
330
331 switch(vqid) {
332 case RoQ_ID_MOT:
333 apply_motion_8x8(ri, xp, yp, 0, 8, 8);
334 break;
335 case RoQ_ID_FCC:
336 apply_motion_8x8(ri, xp, yp, buf[bpos++], chunk_arg >> 8,
337 chunk_arg & 0xff);
338 break;
339 case RoQ_ID_SLD:
340 qcell = ri->qcells + buf[bpos++];
341 apply_vector_4x4(ri, xp, yp, ri->cells + qcell->idx[0]);
342 apply_vector_4x4(ri, xp+4, yp, ri->cells + qcell->idx[1]);
343 apply_vector_4x4(ri, xp, yp+4, ri->cells + qcell->idx[2]);
344 apply_vector_4x4(ri, xp+4, yp+4, ri->cells + qcell->idx[3]);
345 break;
346 case RoQ_ID_CCC:
347 for (k = 0; k < 4; k++) {
348 x = xp; y = yp;
349 if(k & 0x01) x += 4;
350 if(k & 0x02) y += 4;
351
352 if (vqflg_pos < 0) {
353 vqflg = buf[bpos++];
354 vqflg |= (buf[bpos++] << 8);
355 vqflg_pos = 7;
356 }
357 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
358 frame_stats[1][vqid]++;
359 vqflg_pos--;
360 switch(vqid) {
361 case RoQ_ID_MOT:
362 apply_motion_4x4(ri, x, y, 0, 8, 8);
363 break;
364 case RoQ_ID_FCC:
115329f1 365 apply_motion_4x4(ri, x, y, buf[bpos++],
3ef8be2b
MM
366 chunk_arg >> 8, chunk_arg & 0xff);
367 break;
368 case RoQ_ID_SLD:
369 qcell = ri->qcells + buf[bpos++];
370 apply_vector_2x2(ri, x, y, ri->cells + qcell->idx[0]);
371 apply_vector_2x2(ri, x+2, y, ri->cells + qcell->idx[1]);
372 apply_vector_2x2(ri, x, y+2, ri->cells + qcell->idx[2]);
373 apply_vector_2x2(ri, x+2, y+2, ri->cells + qcell->idx[3]);
374 break;
375 case RoQ_ID_CCC:
376 apply_vector_2x2(ri, x, y, ri->cells + buf[bpos]);
377 apply_vector_2x2(ri, x+2, y, ri->cells + buf[bpos+1]);
378 apply_vector_2x2(ri, x, y+2, ri->cells + buf[bpos+2]);
379 apply_vector_2x2(ri, x+2, y+2, ri->cells + buf[bpos+3]);
380 bpos += 4;
381 break;
382 }
383 }
384 break;
385 default:
9b879566 386 av_log(ri->avctx, AV_LOG_ERROR, "Unknown vq code: %d\n", vqid);
3ef8be2b
MM
387 }
388 }
389
390 xpos += 16;
391 if (xpos >= ri->avctx->width) {
392 xpos -= ri->avctx->width;
393 ypos += 16;
394 }
395 if(ypos >= ri->avctx->height)
396 break;
397 }
398}
399
400
401static int roq_decode_init(AVCodecContext *avctx)
402{
403 RoqContext *s = avctx->priv_data;
ec59fd53 404 int i;
3ef8be2b
MM
405
406 s->avctx = avctx;
407 s->first_frame = 1;
408 avctx->pix_fmt = PIX_FMT_YUV420P;
409 avctx->has_b_frames = 0;
410 dsputil_init(&s->dsp, avctx);
411
ec59fd53
MM
412 uiclp = uiclip+512;
413 for(i = -512; i < 512; i++)
414 uiclp[i] = (i < 0 ? 0 : (i > 255 ? 255 : i));
415
3ef8be2b
MM
416 return 0;
417}
418
419static int roq_decode_frame(AVCodecContext *avctx,
420 void *data, int *data_size,
421 uint8_t *buf, int buf_size)
422{
423 RoqContext *s = avctx->priv_data;
424
3ef8be2b 425 if (avctx->get_buffer(avctx, &s->current_frame)) {
9b879566 426 av_log(avctx, AV_LOG_ERROR, " RoQ: get_buffer() failed\n");
3ef8be2b
MM
427 return -1;
428 }
429 s->y_stride = s->current_frame.linesize[0];
430 s->c_stride = s->current_frame.linesize[1];
431
432 s->buf = buf;
433 s->size = buf_size;
434 roqvideo_decode_frame(s);
435
436 /* release the last frame if it is allocated */
437 if (s->first_frame)
438 s->first_frame = 0;
439 else
440 avctx->release_buffer(avctx, &s->last_frame);
441
442 /* shuffle frames */
443 s->last_frame = s->current_frame;
444
445 *data_size = sizeof(AVFrame);
446 *(AVFrame*)data = s->current_frame;
447
448 return buf_size;
449}
450
451static int roq_decode_end(AVCodecContext *avctx)
452{
453 RoqContext *s = avctx->priv_data;
454
455 /* release the last frame */
b9029997
MM
456 if (s->last_frame.data[0])
457 avctx->release_buffer(avctx, &s->last_frame);
3ef8be2b
MM
458
459 return 0;
460}
461
462AVCodec roq_decoder = {
463 "roqvideo",
464 CODEC_TYPE_VIDEO,
465 CODEC_ID_ROQ,
466 sizeof(RoqContext),
467 roq_decode_init,
468 NULL,
469 roq_decode_end,
470 roq_decode_frame,
471 CODEC_CAP_DR1,
472};