8359782e69b6d364ad3061476ff116129467701b
[libav.git] / libavcodec / xan.c
1 /*
2 * Wing Commander/Xan Video Decoder
3 * Copyright (C) 2003 the ffmpeg project
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 *
19 */
20
21 /**
22 * @file xan.c
23 * Xan video decoder for Wing Commander III & IV computer games
24 * by Mario Brito (mbrito@student.dei.uc.pt)
25 * and Mike Melanson (melanson@pcisys.net)
26 *
27 * The xan_wc3 decoder outputs the following colorspaces natively:
28 * PAL8 (default), RGB555, RGB565, RGB24, BGR24, RGBA32, YUV444P
29 */
30
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include <string.h>
34 #include <unistd.h>
35
36 #include "common.h"
37 #include "avcodec.h"
38 #include "dsputil.h"
39
40 #define PALETTE_COUNT 256
41 #define PALETTE_CONTROL_SIZE ((256 * 3) + 1)
42
43 typedef struct XanContext {
44
45 AVCodecContext *avctx;
46 DSPContext dsp;
47 AVFrame last_frame;
48 AVFrame current_frame;
49
50 unsigned char *buf;
51 int size;
52
53 unsigned char palette[PALETTE_COUNT * 4];
54
55 /* scratch space */
56 unsigned char *buffer1;
57 unsigned char *buffer2;
58
59 } XanContext;
60
61 #define BE_16(x) ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1])
62 #define LE_16(x) ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
63 #define LE_32(x) ((((uint8_t*)(x))[3] << 24) | \
64 (((uint8_t*)(x))[2] << 16) | \
65 (((uint8_t*)(x))[1] << 8) | \
66 ((uint8_t*)(x))[0])
67
68 /* RGB -> YUV conversion stuff */
69 #define SCALEFACTOR 65536
70 #define CENTERSAMPLE 128
71
72 #define COMPUTE_Y(r, g, b) \
73 (unsigned char) \
74 ((y_r_table[r] + y_g_table[g] + y_b_table[b]) / SCALEFACTOR)
75 #define COMPUTE_U(r, g, b) \
76 (unsigned char) \
77 ((u_r_table[r] + u_g_table[g] + u_b_table[b]) / SCALEFACTOR + CENTERSAMPLE)
78 #define COMPUTE_V(r, g, b) \
79 (unsigned char) \
80 ((v_r_table[r] + v_g_table[g] + v_b_table[b]) / SCALEFACTOR + CENTERSAMPLE)
81
82 #define Y_R (SCALEFACTOR * 0.29900)
83 #define Y_G (SCALEFACTOR * 0.58700)
84 #define Y_B (SCALEFACTOR * 0.11400)
85
86 #define U_R (SCALEFACTOR * -0.16874)
87 #define U_G (SCALEFACTOR * -0.33126)
88 #define U_B (SCALEFACTOR * 0.50000)
89
90 #define V_R (SCALEFACTOR * 0.50000)
91 #define V_G (SCALEFACTOR * -0.41869)
92 #define V_B (SCALEFACTOR * -0.08131)
93
94 /*
95 * Precalculate all of the YUV tables since it requires fewer than
96 * 10 kilobytes to store them.
97 */
98 static int y_r_table[256];
99 static int y_g_table[256];
100 static int y_b_table[256];
101
102 static int u_r_table[256];
103 static int u_g_table[256];
104 static int u_b_table[256];
105
106 static int v_r_table[256];
107 static int v_g_table[256];
108 static int v_b_table[256];
109
110 static int xan_decode_init(AVCodecContext *avctx)
111 {
112 XanContext *s = avctx->priv_data;
113 int i;
114
115 s->avctx = avctx;
116
117 if ((avctx->codec->id == CODEC_ID_XAN_WC3) &&
118 (s->avctx->extradata_size != sizeof(AVPaletteControl))) {
119 printf (" WC3 Xan video: expected extradata_size of %d\n",
120 sizeof(AVPaletteControl));
121 return -1;
122 }
123
124 avctx->pix_fmt = PIX_FMT_PAL8;
125 avctx->has_b_frames = 0;
126 dsputil_init(&s->dsp, avctx);
127
128 /* initialize the RGB -> YUV tables */
129 for (i = 0; i < 256; i++) {
130 y_r_table[i] = Y_R * i;
131 y_g_table[i] = Y_G * i;
132 y_b_table[i] = Y_B * i;
133
134 u_r_table[i] = U_R * i;
135 u_g_table[i] = U_G * i;
136 u_b_table[i] = U_B * i;
137
138 v_r_table[i] = V_R * i;
139 v_g_table[i] = V_G * i;
140 v_b_table[i] = V_B * i;
141 }
142
143 s->buffer1 = av_malloc(avctx->width * avctx->height);
144 s->buffer2 = av_malloc(avctx->width * avctx->height);
145 if (!s->buffer1 || !s->buffer2)
146 return -1;
147
148 return 0;
149 }
150
151 /* This function is used in lieu of memcpy(). This decoder can not use
152 * memcpy because the memory locations often overlap and
153 * memcpy doesn't like that; it's not uncommon, for example, for
154 * dest = src+1, to turn byte A into pattern AAAAAAAA.
155 * This was originally repz movsb in Intel x86 ASM. */
156 static inline void bytecopy(unsigned char *dest, unsigned char *src, int count)
157 {
158 int i;
159
160 for (i = 0; i < count; i++)
161 dest[i] = src[i];
162 }
163
164 static int xan_huffman_decode(unsigned char *dest, unsigned char *src)
165 {
166 unsigned char byte = *src++;
167 unsigned char ival = byte + 0x16;
168 unsigned char * ptr = src + byte*2;
169 unsigned char val = ival;
170 int counter = 0;
171
172 unsigned char bits = *ptr++;
173
174 while ( val != 0x16 ) {
175 if ( (1 << counter) & bits )
176 val = src[byte + val - 0x17];
177 else
178 val = src[val - 0x17];
179
180 if ( val < 0x16 ) {
181 *dest++ = val;
182 val = ival;
183 }
184
185 if (counter++ == 7) {
186 counter = 0;
187 bits = *ptr++;
188 }
189 }
190
191 return 0;
192 }
193
194 static void xan_unpack(unsigned char *dest, unsigned char *src)
195 {
196 unsigned char opcode;
197 int size;
198 int offset;
199 int byte1, byte2, byte3;
200
201 for (;;) {
202 opcode = *src++;
203
204 if ( (opcode & 0x80) == 0 ) {
205
206 offset = *src++;
207
208 size = opcode & 3;
209 bytecopy(dest, src, size); dest += size; src += size;
210
211 size = ((opcode & 0x1c) >> 2) + 3;
212 bytecopy (dest, dest - (((opcode & 0x60) << 3) + offset + 1), size);
213 dest += size;
214
215 } else if ( (opcode & 0x40) == 0 ) {
216
217 byte1 = *src++;
218 byte2 = *src++;
219
220 size = byte1 >> 6;
221 bytecopy (dest, src, size); dest += size; src += size;
222
223 size = (opcode & 0x3f) + 4;
224 bytecopy (dest, dest - (((byte1 & 0x3f) << 8) + byte2 + 1), size);
225 dest += size;
226
227 } else if ( (opcode & 0x20) == 0 ) {
228
229 byte1 = *src++;
230 byte2 = *src++;
231 byte3 = *src++;
232
233 size = opcode & 3;
234 bytecopy (dest, src, size); dest += size; src += size;
235
236 size = byte3 + 5 + ((opcode & 0xc) << 6);
237 bytecopy (dest,
238 dest - ((((opcode & 0x10) >> 4) << 0x10) + 1 + (byte1 << 8) + byte2),
239 size);
240 dest += size;
241 } else {
242 size = ((opcode & 0x1f) << 2) + 4;
243
244 if (size > 0x70)
245 break;
246
247 bytecopy (dest, src, size); dest += size; src += size;
248 }
249 }
250
251 size = opcode & 3;
252 bytecopy(dest, src, size); dest += size; src += size;
253 }
254
255 static void inline xan_wc3_build_palette(XanContext *s,
256 unsigned char *palette_data)
257 {
258 int i;
259 unsigned char r, g, b;
260 unsigned short *palette16;
261 unsigned int *palette32;
262
263 /* transform the palette passed through the palette control structure
264 * into the necessary internal format depending on colorspace */
265
266 switch (s->avctx->pix_fmt) {
267
268 case PIX_FMT_RGB555:
269 palette16 = (unsigned short *)s->palette;
270 for (i = 0; i < PALETTE_COUNT; i++) {
271 r = *palette_data++;
272 g = *palette_data++;
273 b = *palette_data++;
274 palette16[i] =
275 ((r >> 3) << 10) |
276 ((g >> 3) << 5) |
277 ((b >> 3) << 0);
278 }
279 break;
280
281 case PIX_FMT_RGB565:
282 palette16 = (unsigned short *)s->palette;
283 for (i = 0; i < PALETTE_COUNT; i++) {
284 r = *palette_data++;
285 g = *palette_data++;
286 b = *palette_data++;
287 palette16[i] =
288 ((r >> 3) << 11) |
289 ((g >> 2) << 5) |
290 ((b >> 3) << 0);
291 }
292 break;
293
294 case PIX_FMT_RGB24:
295 for (i = 0; i < PALETTE_COUNT; i++) {
296 s->palette[i * 4 + 0] = *palette_data++;
297 s->palette[i * 4 + 1] = *palette_data++;
298 s->palette[i * 4 + 2] = *palette_data++;
299 }
300 break;
301
302 case PIX_FMT_BGR24:
303 for (i = 0; i < PALETTE_COUNT; i++) {
304 r = *palette_data++;
305 g = *palette_data++;
306 b = *palette_data++;
307 s->palette[i * 4 + 0] = b;
308 s->palette[i * 4 + 1] = g;
309 s->palette[i * 4 + 2] = r;
310 }
311 break;
312
313 case PIX_FMT_PAL8:
314 case PIX_FMT_RGBA32:
315 palette32 = (unsigned int *)s->palette;
316 for (i = 0; i < PALETTE_COUNT; i++) {
317 r = *palette_data++;
318 g = *palette_data++;
319 b = *palette_data++;
320 palette32[i] = (r << 16) | (g << 8) | (b);
321 }
322 break;
323
324 case PIX_FMT_YUV444P:
325 for (i = 0; i < PALETTE_COUNT; i++) {
326 r = *palette_data++;
327 g = *palette_data++;
328 b = *palette_data++;
329 s->palette[i * 4 + 0] = COMPUTE_Y(r, g, b);
330 s->palette[i * 4 + 1] = COMPUTE_U(r, g, b);
331 s->palette[i * 4 + 2] = COMPUTE_V(r, g, b);
332 }
333 break;
334
335 default:
336 printf (" Xan WC3: Unhandled colorspace\n");
337 break;
338 }
339 }
340
341 /* advance current_x variable; reset accounting variables if current_x
342 * moves beyond width */
343 #define ADVANCE_CURRENT_X() \
344 current_x++; \
345 if (current_x >= width) { \
346 index += line_inc; \
347 current_x = 0; \
348 }
349
350 static void inline xan_wc3_output_pixel_run(XanContext *s,
351 unsigned char *pixel_buffer, int x, int y, int pixel_count)
352 {
353 int stride;
354 int line_inc;
355 int index;
356 int current_x;
357 int width = s->avctx->width;
358 unsigned char pix;
359 unsigned char *palette_plane;
360 unsigned char *y_plane;
361 unsigned char *u_plane;
362 unsigned char *v_plane;
363 unsigned char *rgb_plane;
364 unsigned short *rgb16_plane;
365 unsigned short *palette16;
366 unsigned int *rgb32_plane;
367 unsigned int *palette32;
368
369 switch (s->avctx->pix_fmt) {
370
371 case PIX_FMT_PAL8:
372 palette_plane = s->current_frame.data[0];
373 stride = s->current_frame.linesize[0];
374 line_inc = stride - width;
375 index = y * stride + x;
376 current_x = x;
377 while(pixel_count--) {
378
379 /* don't do a memcpy() here; keyframes generally copy an entire
380 * frame of data and the stride needs to be accounted for */
381 palette_plane[index++] = *pixel_buffer++;
382
383 ADVANCE_CURRENT_X();
384 }
385 break;
386
387 case PIX_FMT_RGB555:
388 case PIX_FMT_RGB565:
389 rgb16_plane = (unsigned short *)s->current_frame.data[0];
390 palette16 = (unsigned short *)s->palette;
391 stride = s->current_frame.linesize[0] / 2;
392 line_inc = stride - width;
393 index = y * stride + x;
394 current_x = x;
395 while(pixel_count--) {
396
397 rgb16_plane[index++] = palette16[*pixel_buffer++];
398
399 ADVANCE_CURRENT_X();
400 }
401 break;
402
403 case PIX_FMT_RGB24:
404 case PIX_FMT_BGR24:
405 rgb_plane = s->current_frame.data[0];
406 stride = s->current_frame.linesize[0];
407 line_inc = stride - width * 3;
408 index = y * stride + x * 3;
409 current_x = x;
410 while(pixel_count--) {
411 pix = *pixel_buffer++;
412
413 rgb_plane[index++] = s->palette[pix * 4 + 0];
414 rgb_plane[index++] = s->palette[pix * 4 + 1];
415 rgb_plane[index++] = s->palette[pix * 4 + 2];
416
417 ADVANCE_CURRENT_X();
418 }
419 break;
420
421 case PIX_FMT_RGBA32:
422 rgb32_plane = (unsigned int *)s->current_frame.data[0];
423 palette32 = (unsigned int *)s->palette;
424 stride = s->current_frame.linesize[0] / 4;
425 line_inc = stride - width;
426 index = y * stride + x;
427 current_x = x;
428 while(pixel_count--) {
429
430 rgb32_plane[index++] = palette32[*pixel_buffer++];
431
432 ADVANCE_CURRENT_X();
433 }
434 break;
435
436 case PIX_FMT_YUV444P:
437 y_plane = s->current_frame.data[0];
438 u_plane = s->current_frame.data[1];
439 v_plane = s->current_frame.data[2];
440 stride = s->current_frame.linesize[0];
441 line_inc = stride - width;
442 index = y * stride + x;
443 current_x = x;
444 while(pixel_count--) {
445 pix = *pixel_buffer++;
446
447 y_plane[index] = s->palette[pix * 4 + 0];
448 u_plane[index] = s->palette[pix * 4 + 1];
449 v_plane[index] = s->palette[pix * 4 + 2];
450
451 index++;
452 ADVANCE_CURRENT_X();
453 }
454 break;
455
456 default:
457 printf (" Xan WC3: Unhandled colorspace\n");
458 break;
459 }
460 }
461
462 #define ADVANCE_CURFRAME_X() \
463 curframe_x++; \
464 if (curframe_x >= width) { \
465 curframe_index += line_inc; \
466 curframe_x = 0; \
467 }
468
469 #define ADVANCE_PREVFRAME_X() \
470 prevframe_x++; \
471 if (prevframe_x >= width) { \
472 prevframe_index += line_inc; \
473 prevframe_x = 0; \
474 }
475
476 static void inline xan_wc3_copy_pixel_run(XanContext *s,
477 int x, int y, int pixel_count, int motion_x, int motion_y)
478 {
479 int stride;
480 int line_inc;
481 int curframe_index, prevframe_index;
482 int curframe_x, prevframe_x;
483 int width = s->avctx->width;
484 unsigned char *palette_plane, *prev_palette_plane;
485 unsigned char *y_plane, *u_plane, *v_plane;
486 unsigned char *prev_y_plane, *prev_u_plane, *prev_v_plane;
487 unsigned char *rgb_plane, *prev_rgb_plane;
488 unsigned short *rgb16_plane, *prev_rgb16_plane;
489 unsigned int *rgb32_plane, *prev_rgb32_plane;
490
491 switch (s->avctx->pix_fmt) {
492
493 case PIX_FMT_PAL8:
494 palette_plane = s->current_frame.data[0];
495 prev_palette_plane = s->last_frame.data[0];
496 stride = s->current_frame.linesize[0];
497 line_inc = stride - width;
498 curframe_index = y * stride + x;
499 curframe_x = x;
500 prevframe_index = (y + motion_y) * stride + x + motion_x;
501 prevframe_x = x + motion_x;
502 while(pixel_count--) {
503
504 palette_plane[curframe_index++] =
505 prev_palette_plane[prevframe_index++];
506
507 ADVANCE_CURFRAME_X();
508 ADVANCE_PREVFRAME_X();
509 }
510 break;
511
512 case PIX_FMT_RGB555:
513 case PIX_FMT_RGB565:
514 rgb16_plane = (unsigned short *)s->current_frame.data[0];
515 prev_rgb16_plane = (unsigned short *)s->last_frame.data[0];
516 stride = s->current_frame.linesize[0] / 2;
517 line_inc = stride - width;
518 curframe_index = y * stride + x;
519 curframe_x = x;
520 prevframe_index = (y + motion_y) * stride + x + motion_x;
521 prevframe_x = x + motion_x;
522 while(pixel_count--) {
523
524 rgb16_plane[curframe_index++] =
525 prev_rgb16_plane[prevframe_index++];
526
527 ADVANCE_CURFRAME_X();
528 ADVANCE_PREVFRAME_X();
529 }
530 break;
531
532 case PIX_FMT_RGB24:
533 case PIX_FMT_BGR24:
534 rgb_plane = s->current_frame.data[0];
535 prev_rgb_plane = s->last_frame.data[0];
536 stride = s->current_frame.linesize[0];
537 line_inc = stride - width * 3;
538 curframe_index = y * stride + x * 3;
539 curframe_x = x;
540 prevframe_index = (y + motion_y) * stride +
541 (3 * (x + motion_x));
542 prevframe_x = x + motion_x;
543 while(pixel_count--) {
544
545 rgb_plane[curframe_index++] = prev_rgb_plane[prevframe_index++];
546 rgb_plane[curframe_index++] = prev_rgb_plane[prevframe_index++];
547 rgb_plane[curframe_index++] = prev_rgb_plane[prevframe_index++];
548
549 ADVANCE_CURFRAME_X();
550 ADVANCE_PREVFRAME_X();
551 }
552 break;
553
554 case PIX_FMT_RGBA32:
555 rgb32_plane = (unsigned int *)s->current_frame.data[0];
556 prev_rgb32_plane = (unsigned int *)s->last_frame.data[0];
557 stride = s->current_frame.linesize[0] / 4;
558 line_inc = stride - width;
559 curframe_index = y * stride + x;
560 curframe_x = x;
561 prevframe_index = (y + motion_y) * stride + x + motion_x;
562 prevframe_x = x + motion_x;
563 while(pixel_count--) {
564
565 rgb32_plane[curframe_index++] =
566 prev_rgb32_plane[prevframe_index++];
567
568 ADVANCE_CURFRAME_X();
569 ADVANCE_PREVFRAME_X();
570 }
571 break;
572
573 case PIX_FMT_YUV444P:
574 y_plane = s->current_frame.data[0];
575 u_plane = s->current_frame.data[1];
576 v_plane = s->current_frame.data[2];
577 prev_y_plane = s->last_frame.data[0];
578 prev_u_plane = s->last_frame.data[1];
579 prev_v_plane = s->last_frame.data[2];
580 stride = s->current_frame.linesize[0];
581 line_inc = stride - width;
582 curframe_index = y * stride + x;
583 curframe_x = x;
584 prevframe_index = (y + motion_y) * stride + x + motion_x;
585 prevframe_x = x + motion_x;
586 while(pixel_count--) {
587
588 y_plane[curframe_index] = prev_y_plane[prevframe_index];
589 u_plane[curframe_index] = prev_u_plane[prevframe_index];
590 v_plane[curframe_index] = prev_v_plane[prevframe_index];
591
592 curframe_index++;
593 ADVANCE_CURFRAME_X();
594 prevframe_index++;
595 ADVANCE_PREVFRAME_X();
596 }
597 break;
598
599 default:
600 printf (" Xan WC3: Unhandled colorspace\n");
601 break;
602 }
603 }
604
605 static void xan_wc3_decode_frame(XanContext *s) {
606
607 int width = s->avctx->width;
608 int height = s->avctx->height;
609 int total_pixels = width * height;
610 unsigned char opcode;
611 unsigned char flag = 0;
612 int size = 0;
613 int motion_x, motion_y;
614 int x, y;
615
616 unsigned char *opcode_buffer = s->buffer1;
617 unsigned char *imagedata_buffer = s->buffer2;
618
619 /* pointers to segments inside the compressed chunk */
620 unsigned char *huffman_segment;
621 unsigned char *size_segment;
622 unsigned char *vector_segment;
623 unsigned char *imagedata_segment;
624
625 huffman_segment = s->buf + LE_16(&s->buf[0]);
626 size_segment = s->buf + LE_16(&s->buf[2]);
627 vector_segment = s->buf + LE_16(&s->buf[4]);
628 imagedata_segment = s->buf + LE_16(&s->buf[6]);
629
630 xan_huffman_decode(opcode_buffer, huffman_segment);
631
632 if (imagedata_segment[0] == 2)
633 xan_unpack(imagedata_buffer, &imagedata_segment[1]);
634 else
635 imagedata_buffer = &imagedata_segment[1];
636
637 /* use the decoded data segments to build the frame */
638 x = y = 0;
639 while (total_pixels) {
640
641 opcode = *opcode_buffer++;
642 size = 0;
643
644 switch (opcode) {
645
646 case 0:
647 flag ^= 1;
648 continue;
649
650 case 1:
651 case 2:
652 case 3:
653 case 4:
654 case 5:
655 case 6:
656 case 7:
657 case 8:
658 size = opcode;
659 break;
660
661 case 12:
662 case 13:
663 case 14:
664 case 15:
665 case 16:
666 case 17:
667 case 18:
668 size += (opcode - 10);
669 break;
670
671 case 9:
672 case 19:
673 size = *size_segment++;
674 break;
675
676 case 10:
677 case 20:
678 size = BE_16(&size_segment[0]);
679 size_segment += 2;
680 break;
681
682 case 11:
683 case 21:
684 size = (size_segment[0] << 16) | (size_segment[1] << 8) |
685 size_segment[2];
686 size_segment += 3;
687 break;
688 }
689
690 if (opcode < 12) {
691 flag ^= 1;
692 if (flag) {
693 /* run of (size) pixels is unchanged from last frame */
694 xan_wc3_copy_pixel_run(s, x, y, size, 0, 0);
695 } else {
696 /* output a run of pixels from imagedata_buffer */
697 xan_wc3_output_pixel_run(s, imagedata_buffer, x, y, size);
698 imagedata_buffer += size;
699 }
700 } else {
701 /* run-based motion compensation from last frame */
702 motion_x = (*vector_segment >> 4) & 0xF;
703 motion_y = *vector_segment & 0xF;
704 vector_segment++;
705
706 /* sign extension */
707 if (motion_x & 0x8)
708 motion_x |= 0xFFFFFFF0;
709 if (motion_y & 0x8)
710 motion_y |= 0xFFFFFFF0;
711
712 /* copy a run of pixels from the previous frame */
713 xan_wc3_copy_pixel_run(s, x, y, size, motion_x, motion_y);
714
715 flag = 0;
716 }
717
718 /* coordinate accounting */
719 total_pixels -= size;
720 while (size) {
721 if (x + size >= width) {
722 y++;
723 size -= (width - x);
724 x = 0;
725 } else {
726 x += size;
727 size = 0;
728 }
729 }
730 }
731
732 /* for PAL8, make the palette available on the way out */
733 if (s->avctx->pix_fmt == PIX_FMT_PAL8)
734 memcpy(s->current_frame.data[1], s->palette, PALETTE_COUNT * 4);
735 }
736
737 static void xan_wc4_decode_frame(XanContext *s) {
738 }
739
740 static int xan_decode_frame(AVCodecContext *avctx,
741 void *data, int *data_size,
742 uint8_t *buf, int buf_size)
743 {
744 XanContext *s = avctx->priv_data;
745 AVPaletteControl *palette_control = (AVPaletteControl *)avctx->extradata;
746 int keyframe = 0;
747
748 if (palette_control->palette_changed) {
749 /* load the new palette and reset the palette control */
750 xan_wc3_build_palette(s, palette_control->palette);
751 palette_control->palette_changed = 0;
752 keyframe = 1;
753 }
754
755 if (avctx->get_buffer(avctx, &s->current_frame)) {
756 printf (" Xan Video: get_buffer() failed\n");
757 return -1;
758 }
759 s->current_frame.reference = 3;
760
761 s->buf = buf;
762 s->size = buf_size;
763
764 if (avctx->codec->id == CODEC_ID_XAN_WC3)
765 xan_wc3_decode_frame(s);
766 else if (avctx->codec->id == CODEC_ID_XAN_WC4)
767 xan_wc4_decode_frame(s);
768
769 /* release the last frame if it is allocated */
770 if (s->last_frame.data[0])
771 avctx->release_buffer(avctx, &s->last_frame);
772
773 /* shuffle frames */
774 s->last_frame = s->current_frame;
775
776 *data_size = sizeof(AVFrame);
777 *(AVFrame*)data = s->current_frame;
778
779 /* always report that the buffer was completely consumed */
780 return buf_size;
781 }
782
783 static int xan_decode_end(AVCodecContext *avctx)
784 {
785 XanContext *s = avctx->priv_data;
786
787 /* release the last frame */
788 avctx->release_buffer(avctx, &s->last_frame);
789
790 av_free(s->buffer1);
791 av_free(s->buffer2);
792
793 return 0;
794 }
795
796 AVCodec xan_wc3_decoder = {
797 "xan_wc3",
798 CODEC_TYPE_VIDEO,
799 CODEC_ID_XAN_WC3,
800 sizeof(XanContext),
801 xan_decode_init,
802 NULL,
803 xan_decode_end,
804 xan_decode_frame,
805 CODEC_CAP_DR1,
806 };
807
808 /*
809 AVCodec xan_wc4_decoder = {
810 "xan_wc4",
811 CODEC_TYPE_VIDEO,
812 CODEC_ID_XAN_WC4,
813 sizeof(XanContext),
814 xan_decode_init,
815 NULL,
816 xan_decode_end,
817 xan_decode_frame,
818 CODEC_CAP_DR1,
819 };
820 */