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Imported Debian version 2.4.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / interplayvideo.c
CommitLineData
2ba45a60
DM		 1/*
2 * Interplay MVE Video Decoder
3 * Copyright (c) 2003 The FFmpeg Project
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 * Interplay MVE Video Decoder by Mike Melanson (melanson@pcisys.net)
25 * For more information about the Interplay MVE format, visit:
26 * http://www.pcisys.net/~melanson/codecs/interplay-mve.txt
27 * This code is written in such a way that the identifiers match up
28 * with the encoding descriptions in the document.
29 *
30 * This decoder presently only supports a PAL8 output colorspace.
31 *
32 * An Interplay video frame consists of 2 parts: The decoding map and
33 * the video data. A demuxer must load these 2 parts together in a single
34 * buffer before sending it through the stream to this decoder.
35 */
36
37#include <stdio.h>
38#include <stdlib.h>
39#include <string.h>
40
41#include "avcodec.h"
42#include "bytestream.h"
43#include "hpeldsp.h"
44#define BITSTREAM_READER_LE
45#include "get_bits.h"
46#include "internal.h"
47
48#define PALETTE_COUNT 256
49
50typedef struct IpvideoContext {
51
52 AVCodecContext *avctx;
53 HpelDSPContext hdsp;
54 AVFrame *second_last_frame;
55 AVFrame *last_frame;
56 const unsigned char *decoding_map;
57 int decoding_map_size;
58
59 int is_16bpp;
60 GetByteContext stream_ptr, mv_ptr;
61 unsigned char *pixel_ptr;
62 int line_inc;
63 int stride;
64 int upper_motion_limit_offset;
65
66 uint32_t pal[256];
67} IpvideoContext;
68
69static int copy_from(IpvideoContext *s, AVFrame *src, AVFrame *dst, int delta_x, int delta_y)
70{
71 int current_offset = s->pixel_ptr - dst->data[0];
72 int motion_offset = current_offset + delta_y * dst->linesize[0]
73 + delta_x * (1 + s->is_16bpp);
74 if (motion_offset < 0) {
75 av_log(s->avctx, AV_LOG_ERROR, "motion offset < 0 (%d)\n", motion_offset);
76 return AVERROR_INVALIDDATA;
77 } else if (motion_offset > s->upper_motion_limit_offset) {
78 av_log(s->avctx, AV_LOG_ERROR, "motion offset above limit (%d >= %d)\n",
79 motion_offset, s->upper_motion_limit_offset);
80 return AVERROR_INVALIDDATA;
81 }
82 if (!src->data[0]) {
83 av_log(s->avctx, AV_LOG_ERROR, "Invalid decode type, corrupted header?\n");
84 return AVERROR(EINVAL);
85 }
86 s->hdsp.put_pixels_tab[!s->is_16bpp][0](s->pixel_ptr, src->data[0] + motion_offset,
87 dst->linesize[0], 8);
88 return 0;
89}
90
91static int ipvideo_decode_block_opcode_0x0(IpvideoContext *s, AVFrame *frame)
92{
93 return copy_from(s, s->last_frame, frame, 0, 0);
94}
95
96static int ipvideo_decode_block_opcode_0x1(IpvideoContext *s, AVFrame *frame)
97{
98 return copy_from(s, s->second_last_frame, frame, 0, 0);
99}
100
101static int ipvideo_decode_block_opcode_0x2(IpvideoContext *s, AVFrame *frame)
102{
103 unsigned char B;
104 int x, y;
105
106 /* copy block from 2 frames ago using a motion vector; need 1 more byte */
107 if (!s->is_16bpp) {
108 B = bytestream2_get_byte(&s->stream_ptr);
109 } else {
110 B = bytestream2_get_byte(&s->mv_ptr);
111 }
112
113 if (B < 56) {
114 x = 8 + (B % 7);
115 y = B / 7;
116 } else {
117 x = -14 + ((B - 56) % 29);
118 y = 8 + ((B - 56) / 29);
119 }
120
121 av_dlog(s->avctx, "motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
122 return copy_from(s, s->second_last_frame, frame, x, y);
123}
124
125static int ipvideo_decode_block_opcode_0x3(IpvideoContext *s, AVFrame *frame)
126{
127 unsigned char B;
128 int x, y;
129
130 /* copy 8x8 block from current frame from an up/left block */
131
132 /* need 1 more byte for motion */
133 if (!s->is_16bpp) {
134 B = bytestream2_get_byte(&s->stream_ptr);
135 } else {
136 B = bytestream2_get_byte(&s->mv_ptr);
137 }
138
139 if (B < 56) {
140 x = -(8 + (B % 7));
141 y = -(B / 7);
142 } else {
143 x = -(-14 + ((B - 56) % 29));
144 y = -( 8 + ((B - 56) / 29));
145 }
146
147 av_dlog(s->avctx, "motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
148 return copy_from(s, frame, frame, x, y);
149}
150
151static int ipvideo_decode_block_opcode_0x4(IpvideoContext *s, AVFrame *frame)
152{
153 int x, y;
154 unsigned char B, BL, BH;
155
156 /* copy a block from the previous frame; need 1 more byte */
157 if (!s->is_16bpp) {
158 B = bytestream2_get_byte(&s->stream_ptr);
159 } else {
160 B = bytestream2_get_byte(&s->mv_ptr);
161 }
162
163 BL = B & 0x0F;
164 BH = (B >> 4) & 0x0F;
165 x = -8 + BL;
166 y = -8 + BH;
167
168 av_dlog(s->avctx, "motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
169 return copy_from(s, s->last_frame, frame, x, y);
170}
171
172static int ipvideo_decode_block_opcode_0x5(IpvideoContext *s, AVFrame *frame)
173{
174 signed char x, y;
175
176 /* copy a block from the previous frame using an expanded range;
177 * need 2 more bytes */
178 x = bytestream2_get_byte(&s->stream_ptr);
179 y = bytestream2_get_byte(&s->stream_ptr);
180
181 av_dlog(s->avctx, "motion bytes = %d, %d\n", x, y);
182 return copy_from(s, s->last_frame, frame, x, y);
183}
184
185static int ipvideo_decode_block_opcode_0x6(IpvideoContext *s, AVFrame *frame)
186{
187 /* mystery opcode? skip multiple blocks? */
188 av_log(s->avctx, AV_LOG_ERROR, "Help! Mystery opcode 0x6 seen\n");
189
190 /* report success */
191 return 0;
192}
193
194static int ipvideo_decode_block_opcode_0x7(IpvideoContext *s, AVFrame *frame)
195{
196 int x, y;
197 unsigned char P[2];
198 unsigned int flags;
199
200 if (bytestream2_get_bytes_left(&s->stream_ptr) < 4) {
201 av_log(s->avctx, AV_LOG_ERROR, "too little data for opcode 0x7\n");
202 return AVERROR_INVALIDDATA;
203 }
204
205 /* 2-color encoding */
206 P[0] = bytestream2_get_byte(&s->stream_ptr);
207 P[1] = bytestream2_get_byte(&s->stream_ptr);
208
209 if (P[0] <= P[1]) {
210
211 /* need 8 more bytes from the stream */
212 for (y = 0; y < 8; y++) {
213 flags = bytestream2_get_byte(&s->stream_ptr) | 0x100;
214 for (; flags != 1; flags >>= 1)
215 *s->pixel_ptr++ = P[flags & 1];
216 s->pixel_ptr += s->line_inc;
217 }
218
219 } else {
220
221 /* need 2 more bytes from the stream */
222 flags = bytestream2_get_le16(&s->stream_ptr);
223 for (y = 0; y < 8; y += 2) {
224 for (x = 0; x < 8; x += 2, flags >>= 1) {
225 s->pixel_ptr[x ] =
226 s->pixel_ptr[x + 1 ] =
227 s->pixel_ptr[x + s->stride] =
228 s->pixel_ptr[x + 1 + s->stride] = P[flags & 1];
229 }
230 s->pixel_ptr += s->stride * 2;
231 }
232 }
233
234 /* report success */
235 return 0;
236}
237
238static int ipvideo_decode_block_opcode_0x8(IpvideoContext *s, AVFrame *frame)
239{
240 int x, y;
241 unsigned char P[4];
242 unsigned int flags = 0;
243
244 if (bytestream2_get_bytes_left(&s->stream_ptr) < 12) {
245 av_log(s->avctx, AV_LOG_ERROR, "too little data for opcode 0x8\n");
246 return AVERROR_INVALIDDATA;
247 }
248
249 /* 2-color encoding for each 4x4 quadrant, or 2-color encoding on
250 * either top and bottom or left and right halves */
251 P[0] = bytestream2_get_byte(&s->stream_ptr);
252 P[1] = bytestream2_get_byte(&s->stream_ptr);
253
254 if (P[0] <= P[1]) {
255 for (y = 0; y < 16; y++) {
256 // new values for each 4x4 block
257 if (!(y & 3)) {
258 if (y) {
259 P[0] = bytestream2_get_byte(&s->stream_ptr);
260 P[1] = bytestream2_get_byte(&s->stream_ptr);
261 }
262 flags = bytestream2_get_le16(&s->stream_ptr);
263 }
264
265 for (x = 0; x < 4; x++, flags >>= 1)
266 *s->pixel_ptr++ = P[flags & 1];
267 s->pixel_ptr += s->stride - 4;
268 // switch to right half
269 if (y == 7) s->pixel_ptr -= 8 * s->stride - 4;
270 }
271
272 } else {
273 flags = bytestream2_get_le32(&s->stream_ptr);
274 P[2] = bytestream2_get_byte(&s->stream_ptr);
275 P[3] = bytestream2_get_byte(&s->stream_ptr);
276
277 if (P[2] <= P[3]) {
278
279 /* vertical split; left & right halves are 2-color encoded */
280
281 for (y = 0; y < 16; y++) {
282 for (x = 0; x < 4; x++, flags >>= 1)
283 *s->pixel_ptr++ = P[flags & 1];
284 s->pixel_ptr += s->stride - 4;
285 // switch to right half
286 if (y == 7) {
287 s->pixel_ptr -= 8 * s->stride - 4;
288 P[0] = P[2];
289 P[1] = P[3];
290 flags = bytestream2_get_le32(&s->stream_ptr);
291 }
292 }
293
294 } else {
295
296 /* horizontal split; top & bottom halves are 2-color encoded */
297
298 for (y = 0; y < 8; y++) {
299 if (y == 4) {
300 P[0] = P[2];
301 P[1] = P[3];
302 flags = bytestream2_get_le32(&s->stream_ptr);
303 }
304
305 for (x = 0; x < 8; x++, flags >>= 1)
306 *s->pixel_ptr++ = P[flags & 1];
307 s->pixel_ptr += s->line_inc;
308 }
309 }
310 }
311
312 /* report success */
313 return 0;
314}
315
316static int ipvideo_decode_block_opcode_0x9(IpvideoContext *s, AVFrame *frame)
317{
318 int x, y;
319 unsigned char P[4];
320
321 if (bytestream2_get_bytes_left(&s->stream_ptr) < 8) {
322 av_log(s->avctx, AV_LOG_ERROR, "too little data for opcode 0x9\n");
323 return AVERROR_INVALIDDATA;
324 }
325
326 /* 4-color encoding */
327 bytestream2_get_buffer(&s->stream_ptr, P, 4);
328
329 if (P[0] <= P[1]) {
330 if (P[2] <= P[3]) {
331
332 /* 1 of 4 colors for each pixel, need 16 more bytes */
333 for (y = 0; y < 8; y++) {
334 /* get the next set of 8 2-bit flags */
335 int flags = bytestream2_get_le16(&s->stream_ptr);
336 for (x = 0; x < 8; x++, flags >>= 2)
337 *s->pixel_ptr++ = P[flags & 0x03];
338 s->pixel_ptr += s->line_inc;
339 }
340
341 } else {
342 uint32_t flags;
343
344 /* 1 of 4 colors for each 2x2 block, need 4 more bytes */
345 flags = bytestream2_get_le32(&s->stream_ptr);
346
347 for (y = 0; y < 8; y += 2) {
348 for (x = 0; x < 8; x += 2, flags >>= 2) {
349 s->pixel_ptr[x ] =
350 s->pixel_ptr[x + 1 ] =
351 s->pixel_ptr[x + s->stride] =
352 s->pixel_ptr[x + 1 + s->stride] = P[flags & 0x03];
353 }
354 s->pixel_ptr += s->stride * 2;
355 }
356
357 }
358 } else {
359 uint64_t flags;
360
361 /* 1 of 4 colors for each 2x1 or 1x2 block, need 8 more bytes */
362 flags = bytestream2_get_le64(&s->stream_ptr);
363 if (P[2] <= P[3]) {
364 for (y = 0; y < 8; y++) {
365 for (x = 0; x < 8; x += 2, flags >>= 2) {
366 s->pixel_ptr[x ] =
367 s->pixel_ptr[x + 1] = P[flags & 0x03];
368 }
369 s->pixel_ptr += s->stride;
370 }
371 } else {
372 for (y = 0; y < 8; y += 2) {
373 for (x = 0; x < 8; x++, flags >>= 2) {
374 s->pixel_ptr[x ] =
375 s->pixel_ptr[x + s->stride] = P[flags & 0x03];
376 }
377 s->pixel_ptr += s->stride * 2;
378 }
379 }
380 }
381
382 /* report success */
383 return 0;
384}
385
386static int ipvideo_decode_block_opcode_0xA(IpvideoContext *s, AVFrame *frame)
387{
388 int x, y;
389 unsigned char P[8];
390 int flags = 0;
391
392 if (bytestream2_get_bytes_left(&s->stream_ptr) < 16) {
393 av_log(s->avctx, AV_LOG_ERROR, "too little data for opcode 0xA\n");
394 return AVERROR_INVALIDDATA;
395 }
396
397 bytestream2_get_buffer(&s->stream_ptr, P, 4);
398
399 /* 4-color encoding for each 4x4 quadrant, or 4-color encoding on
400 * either top and bottom or left and right halves */
401 if (P[0] <= P[1]) {
402
403 /* 4-color encoding for each quadrant; need 32 bytes */
404 for (y = 0; y < 16; y++) {
405 // new values for each 4x4 block
406 if (!(y & 3)) {
407 if (y) bytestream2_get_buffer(&s->stream_ptr, P, 4);
408 flags = bytestream2_get_le32(&s->stream_ptr);
409 }
410
411 for (x = 0; x < 4; x++, flags >>= 2)
412 *s->pixel_ptr++ = P[flags & 0x03];
413
414 s->pixel_ptr += s->stride - 4;
415 // switch to right half
416 if (y == 7) s->pixel_ptr -= 8 * s->stride - 4;
417 }
418
419 } else {
420 // vertical split?
421 int vert;
422 uint64_t flags = bytestream2_get_le64(&s->stream_ptr);
423
424 bytestream2_get_buffer(&s->stream_ptr, P + 4, 4);
425 vert = P[4] <= P[5];
426
427 /* 4-color encoding for either left and right or top and bottom
428 * halves */
429
430 for (y = 0; y < 16; y++) {
431 for (x = 0; x < 4; x++, flags >>= 2)
432 *s->pixel_ptr++ = P[flags & 0x03];
433
434 if (vert) {
435 s->pixel_ptr += s->stride - 4;
436 // switch to right half
437 if (y == 7) s->pixel_ptr -= 8 * s->stride - 4;
438 } else if (y & 1) s->pixel_ptr += s->line_inc;
439
440 // load values for second half
441 if (y == 7) {
442 memcpy(P, P + 4, 4);
443 flags = bytestream2_get_le64(&s->stream_ptr);
444 }
445 }
446 }
447
448 /* report success */
449 return 0;
450}
451
452static int ipvideo_decode_block_opcode_0xB(IpvideoContext *s, AVFrame *frame)
453{
454 int y;
455
456 /* 64-color encoding (each pixel in block is a different color) */
457 for (y = 0; y < 8; y++) {
458 bytestream2_get_buffer(&s->stream_ptr, s->pixel_ptr, 8);
459 s->pixel_ptr += s->stride;
460 }
461
462 /* report success */
463 return 0;
464}
465
466static int ipvideo_decode_block_opcode_0xC(IpvideoContext *s, AVFrame *frame)
467{
468 int x, y;
469
470 /* 16-color block encoding: each 2x2 block is a different color */
471 for (y = 0; y < 8; y += 2) {
472 for (x = 0; x < 8; x += 2) {
473 s->pixel_ptr[x ] =
474 s->pixel_ptr[x + 1 ] =
475 s->pixel_ptr[x + s->stride] =
476 s->pixel_ptr[x + 1 + s->stride] = bytestream2_get_byte(&s->stream_ptr);
477 }
478 s->pixel_ptr += s->stride * 2;
479 }
480
481 /* report success */
482 return 0;
483}
484
485static int ipvideo_decode_block_opcode_0xD(IpvideoContext *s, AVFrame *frame)
486{
487 int y;
488 unsigned char P[2];
489
490 if (bytestream2_get_bytes_left(&s->stream_ptr) < 4) {
491 av_log(s->avctx, AV_LOG_ERROR, "too little data for opcode 0xD\n");
492 return AVERROR_INVALIDDATA;
493 }
494
495 /* 4-color block encoding: each 4x4 block is a different color */
496 for (y = 0; y < 8; y++) {
497 if (!(y & 3)) {
498 P[0] = bytestream2_get_byte(&s->stream_ptr);
499 P[1] = bytestream2_get_byte(&s->stream_ptr);
500 }
501 memset(s->pixel_ptr, P[0], 4);
502 memset(s->pixel_ptr + 4, P[1], 4);
503 s->pixel_ptr += s->stride;
504 }
505
506 /* report success */
507 return 0;
508}
509
510static int ipvideo_decode_block_opcode_0xE(IpvideoContext *s, AVFrame *frame)
511{
512 int y;
513 unsigned char pix;
514
515 /* 1-color encoding: the whole block is 1 solid color */
516 pix = bytestream2_get_byte(&s->stream_ptr);
517
518 for (y = 0; y < 8; y++) {
519 memset(s->pixel_ptr, pix, 8);
520 s->pixel_ptr += s->stride;
521 }
522
523 /* report success */
524 return 0;
525}
526
527static int ipvideo_decode_block_opcode_0xF(IpvideoContext *s, AVFrame *frame)
528{
529 int x, y;
530 unsigned char sample[2];
531
532 /* dithered encoding */
533 sample[0] = bytestream2_get_byte(&s->stream_ptr);
534 sample[1] = bytestream2_get_byte(&s->stream_ptr);
535
536 for (y = 0; y < 8; y++) {
537 for (x = 0; x < 8; x += 2) {
538 *s->pixel_ptr++ = sample[ y & 1 ];
539 *s->pixel_ptr++ = sample[!(y & 1)];
540 }
541 s->pixel_ptr += s->line_inc;
542 }
543
544 /* report success */
545 return 0;
546}
547
548static int ipvideo_decode_block_opcode_0x6_16(IpvideoContext *s, AVFrame *frame)
549{
550 signed char x, y;
551
552 /* copy a block from the second last frame using an expanded range */
553 x = bytestream2_get_byte(&s->stream_ptr);
554 y = bytestream2_get_byte(&s->stream_ptr);
555
556 av_dlog(s->avctx, "motion bytes = %d, %d\n", x, y);
557 return copy_from(s, s->second_last_frame, frame, x, y);
558}
559
560static int ipvideo_decode_block_opcode_0x7_16(IpvideoContext *s, AVFrame *frame)
561{
562 int x, y;
563 uint16_t P[2];
564 unsigned int flags;
565 uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
566
567 /* 2-color encoding */
568 P[0] = bytestream2_get_le16(&s->stream_ptr);
569 P[1] = bytestream2_get_le16(&s->stream_ptr);
570
571 if (!(P[0] & 0x8000)) {
572
573 for (y = 0; y < 8; y++) {
574 flags = bytestream2_get_byte(&s->stream_ptr) | 0x100;
575 for (; flags != 1; flags >>= 1)
576 *pixel_ptr++ = P[flags & 1];
577 pixel_ptr += s->line_inc;
578 }
579
580 } else {
581
582 flags = bytestream2_get_le16(&s->stream_ptr);
583 for (y = 0; y < 8; y += 2) {
584 for (x = 0; x < 8; x += 2, flags >>= 1) {
585 pixel_ptr[x ] =
586 pixel_ptr[x + 1 ] =
587 pixel_ptr[x + s->stride] =
588 pixel_ptr[x + 1 + s->stride] = P[flags & 1];
589 }
590 pixel_ptr += s->stride * 2;
591 }
592 }
593
594 return 0;
595}
596
597static int ipvideo_decode_block_opcode_0x8_16(IpvideoContext *s, AVFrame *frame)
598{
599 int x, y;
600 uint16_t P[4];
601 unsigned int flags = 0;
602 uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
603
604 /* 2-color encoding for each 4x4 quadrant, or 2-color encoding on
605 * either top and bottom or left and right halves */
606 P[0] = bytestream2_get_le16(&s->stream_ptr);
607 P[1] = bytestream2_get_le16(&s->stream_ptr);
608
609 if (!(P[0] & 0x8000)) {
610
611 for (y = 0; y < 16; y++) {
612 // new values for each 4x4 block
613 if (!(y & 3)) {
614 if (y) {
615 P[0] = bytestream2_get_le16(&s->stream_ptr);
616 P[1] = bytestream2_get_le16(&s->stream_ptr);
617 }
618 flags = bytestream2_get_le16(&s->stream_ptr);
619 }
620
621 for (x = 0; x < 4; x++, flags >>= 1)
622 *pixel_ptr++ = P[flags & 1];
623 pixel_ptr += s->stride - 4;
624 // switch to right half
625 if (y == 7) pixel_ptr -= 8 * s->stride - 4;
626 }
627
628 } else {
629
630 flags = bytestream2_get_le32(&s->stream_ptr);
631 P[2] = bytestream2_get_le16(&s->stream_ptr);
632 P[3] = bytestream2_get_le16(&s->stream_ptr);
633
634 if (!(P[2] & 0x8000)) {
635
636 /* vertical split; left & right halves are 2-color encoded */
637
638 for (y = 0; y < 16; y++) {
639 for (x = 0; x < 4; x++, flags >>= 1)
640 *pixel_ptr++ = P[flags & 1];
641 pixel_ptr += s->stride - 4;
642 // switch to right half
643 if (y == 7) {
644 pixel_ptr -= 8 * s->stride - 4;
645 P[0] = P[2];
646 P[1] = P[3];
647 flags = bytestream2_get_le32(&s->stream_ptr);
648 }
649 }
650
651 } else {
652
653 /* horizontal split; top & bottom halves are 2-color encoded */
654
655 for (y = 0; y < 8; y++) {
656 if (y == 4) {
657 P[0] = P[2];
658 P[1] = P[3];
659 flags = bytestream2_get_le32(&s->stream_ptr);
660 }
661
662 for (x = 0; x < 8; x++, flags >>= 1)
663 *pixel_ptr++ = P[flags & 1];
664 pixel_ptr += s->line_inc;
665 }
666 }
667 }
668
669 /* report success */
670 return 0;
671}
672
673static int ipvideo_decode_block_opcode_0x9_16(IpvideoContext *s, AVFrame *frame)
674{
675 int x, y;
676 uint16_t P[4];
677 uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
678
679 /* 4-color encoding */
680 for (x = 0; x < 4; x++)
681 P[x] = bytestream2_get_le16(&s->stream_ptr);
682
683 if (!(P[0] & 0x8000)) {
684 if (!(P[2] & 0x8000)) {
685
686 /* 1 of 4 colors for each pixel */
687 for (y = 0; y < 8; y++) {
688 /* get the next set of 8 2-bit flags */
689 int flags = bytestream2_get_le16(&s->stream_ptr);
690 for (x = 0; x < 8; x++, flags >>= 2)
691 *pixel_ptr++ = P[flags & 0x03];
692 pixel_ptr += s->line_inc;
693 }
694
695 } else {
696 uint32_t flags;
697
698 /* 1 of 4 colors for each 2x2 block */
699 flags = bytestream2_get_le32(&s->stream_ptr);
700
701 for (y = 0; y < 8; y += 2) {
702 for (x = 0; x < 8; x += 2, flags >>= 2) {
703 pixel_ptr[x ] =
704 pixel_ptr[x + 1 ] =
705 pixel_ptr[x + s->stride] =
706 pixel_ptr[x + 1 + s->stride] = P[flags & 0x03];
707 }
708 pixel_ptr += s->stride * 2;
709 }
710
711 }
712 } else {
713 uint64_t flags;
714
715 /* 1 of 4 colors for each 2x1 or 1x2 block */
716 flags = bytestream2_get_le64(&s->stream_ptr);
717 if (!(P[2] & 0x8000)) {
718 for (y = 0; y < 8; y++) {
719 for (x = 0; x < 8; x += 2, flags >>= 2) {
720 pixel_ptr[x ] =
721 pixel_ptr[x + 1] = P[flags & 0x03];
722 }
723 pixel_ptr += s->stride;
724 }
725 } else {
726 for (y = 0; y < 8; y += 2) {
727 for (x = 0; x < 8; x++, flags >>= 2) {
728 pixel_ptr[x ] =
729 pixel_ptr[x + s->stride] = P[flags & 0x03];
730 }
731 pixel_ptr += s->stride * 2;
732 }
733 }
734 }
735
736 /* report success */
737 return 0;
738}
739
740static int ipvideo_decode_block_opcode_0xA_16(IpvideoContext *s, AVFrame *frame)
741{
742 int x, y;
743 uint16_t P[8];
744 int flags = 0;
745 uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
746
747 for (x = 0; x < 4; x++)
748 P[x] = bytestream2_get_le16(&s->stream_ptr);
749
750 /* 4-color encoding for each 4x4 quadrant, or 4-color encoding on
751 * either top and bottom or left and right halves */
752 if (!(P[0] & 0x8000)) {
753
754 /* 4-color encoding for each quadrant */
755 for (y = 0; y < 16; y++) {
756 // new values for each 4x4 block
757 if (!(y & 3)) {
758 if (y)
759 for (x = 0; x < 4; x++)
760 P[x] = bytestream2_get_le16(&s->stream_ptr);
761 flags = bytestream2_get_le32(&s->stream_ptr);
762 }
763
764 for (x = 0; x < 4; x++, flags >>= 2)
765 *pixel_ptr++ = P[flags & 0x03];
766
767 pixel_ptr += s->stride - 4;
768 // switch to right half
769 if (y == 7) pixel_ptr -= 8 * s->stride - 4;
770 }
771
772 } else {
773 // vertical split?
774 int vert;
775 uint64_t flags = bytestream2_get_le64(&s->stream_ptr);
776
777 for (x = 4; x < 8; x++)
778 P[x] = bytestream2_get_le16(&s->stream_ptr);
779 vert = !(P[4] & 0x8000);
780
781 /* 4-color encoding for either left and right or top and bottom
782 * halves */
783
784 for (y = 0; y < 16; y++) {
785 for (x = 0; x < 4; x++, flags >>= 2)
786 *pixel_ptr++ = P[flags & 0x03];
787
788 if (vert) {
789 pixel_ptr += s->stride - 4;
790 // switch to right half
791 if (y == 7) pixel_ptr -= 8 * s->stride - 4;
792 } else if (y & 1) pixel_ptr += s->line_inc;
793
794 // load values for second half
795 if (y == 7) {
796 memcpy(P, P + 4, 8);
797 flags = bytestream2_get_le64(&s->stream_ptr);
798 }
799 }
800 }
801
802 /* report success */
803 return 0;
804}
805
806static int ipvideo_decode_block_opcode_0xB_16(IpvideoContext *s, AVFrame *frame)
807{
808 int x, y;
809 uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
810
811 /* 64-color encoding (each pixel in block is a different color) */
812 for (y = 0; y < 8; y++) {
813 for (x = 0; x < 8; x++)
814 pixel_ptr[x] = bytestream2_get_le16(&s->stream_ptr);
815 pixel_ptr += s->stride;
816 }
817
818 /* report success */
819 return 0;
820}
821
822static int ipvideo_decode_block_opcode_0xC_16(IpvideoContext *s, AVFrame *frame)
823{
824 int x, y;
825 uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
826
827 /* 16-color block encoding: each 2x2 block is a different color */
828 for (y = 0; y < 8; y += 2) {
829 for (x = 0; x < 8; x += 2) {
830 pixel_ptr[x ] =
831 pixel_ptr[x + 1 ] =
832 pixel_ptr[x + s->stride] =
833 pixel_ptr[x + 1 + s->stride] = bytestream2_get_le16(&s->stream_ptr);
834 }
835 pixel_ptr += s->stride * 2;
836 }
837
838 /* report success */
839 return 0;
840}
841
842static int ipvideo_decode_block_opcode_0xD_16(IpvideoContext *s, AVFrame *frame)
843{
844 int x, y;
845 uint16_t P[2];
846 uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
847
848 /* 4-color block encoding: each 4x4 block is a different color */
849 for (y = 0; y < 8; y++) {
850 if (!(y & 3)) {
851 P[0] = bytestream2_get_le16(&s->stream_ptr);
852 P[1] = bytestream2_get_le16(&s->stream_ptr);
853 }
854 for (x = 0; x < 8; x++)
855 pixel_ptr[x] = P[x >> 2];
856 pixel_ptr += s->stride;
857 }
858
859 /* report success */
860 return 0;
861}
862
863static int ipvideo_decode_block_opcode_0xE_16(IpvideoContext *s, AVFrame *frame)
864{
865 int x, y;
866 uint16_t pix;
867 uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
868
869 /* 1-color encoding: the whole block is 1 solid color */
870 pix = bytestream2_get_le16(&s->stream_ptr);
871
872 for (y = 0; y < 8; y++) {
873 for (x = 0; x < 8; x++)
874 pixel_ptr[x] = pix;
875 pixel_ptr += s->stride;
876 }
877
878 /* report success */
879 return 0;
880}
881
882static int (* const ipvideo_decode_block[])(IpvideoContext *s, AVFrame *frame) = {
883 ipvideo_decode_block_opcode_0x0, ipvideo_decode_block_opcode_0x1,
884 ipvideo_decode_block_opcode_0x2, ipvideo_decode_block_opcode_0x3,
885 ipvideo_decode_block_opcode_0x4, ipvideo_decode_block_opcode_0x5,
886 ipvideo_decode_block_opcode_0x6, ipvideo_decode_block_opcode_0x7,
887 ipvideo_decode_block_opcode_0x8, ipvideo_decode_block_opcode_0x9,
888 ipvideo_decode_block_opcode_0xA, ipvideo_decode_block_opcode_0xB,
889 ipvideo_decode_block_opcode_0xC, ipvideo_decode_block_opcode_0xD,
890 ipvideo_decode_block_opcode_0xE, ipvideo_decode_block_opcode_0xF,
891};
892
893static int (* const ipvideo_decode_block16[])(IpvideoContext *s, AVFrame *frame) = {
894 ipvideo_decode_block_opcode_0x0, ipvideo_decode_block_opcode_0x1,
895 ipvideo_decode_block_opcode_0x2, ipvideo_decode_block_opcode_0x3,
896 ipvideo_decode_block_opcode_0x4, ipvideo_decode_block_opcode_0x5,
897 ipvideo_decode_block_opcode_0x6_16, ipvideo_decode_block_opcode_0x7_16,
898 ipvideo_decode_block_opcode_0x8_16, ipvideo_decode_block_opcode_0x9_16,
899 ipvideo_decode_block_opcode_0xA_16, ipvideo_decode_block_opcode_0xB_16,
900 ipvideo_decode_block_opcode_0xC_16, ipvideo_decode_block_opcode_0xD_16,
901 ipvideo_decode_block_opcode_0xE_16, ipvideo_decode_block_opcode_0x1,
902};
903
904static void ipvideo_decode_opcodes(IpvideoContext *s, AVFrame *frame)
905{
906 int x, y;
907 unsigned char opcode;
908 int ret;
909 GetBitContext gb;
910
911 bytestream2_skip(&s->stream_ptr, 14); /* data starts 14 bytes in */
912 if (!s->is_16bpp) {
913 /* this is PAL8, so make the palette available */
914 memcpy(frame->data[1], s->pal, AVPALETTE_SIZE);
915
916 s->stride = frame->linesize[0];
917 } else {
918 s->stride = frame->linesize[0] >> 1;
919 s->mv_ptr = s->stream_ptr;
920 bytestream2_skip(&s->mv_ptr, bytestream2_get_le16(&s->stream_ptr));
921 }
922 s->line_inc = s->stride - 8;
923 s->upper_motion_limit_offset = (s->avctx->height - 8) * frame->linesize[0]
924 + (s->avctx->width - 8) * (1 + s->is_16bpp);
925
926 init_get_bits(&gb, s->decoding_map, s->decoding_map_size * 8);
927 for (y = 0; y < s->avctx->height; y += 8) {
928 for (x = 0; x < s->avctx->width; x += 8) {
929 opcode = get_bits(&gb, 4);
930
931 av_dlog(s->avctx,
932 " block @ (%3d, %3d): encoding 0x%X, data ptr offset %d\n",
933 x, y, opcode, bytestream2_tell(&s->stream_ptr));
934
935 if (!s->is_16bpp) {
936 s->pixel_ptr = frame->data[0] + x
937 + y*frame->linesize[0];
938 ret = ipvideo_decode_block[opcode](s, frame);
939 } else {
940 s->pixel_ptr = frame->data[0] + x*2
941 + y*frame->linesize[0];
942 ret = ipvideo_decode_block16[opcode](s, frame);
943 }
944 if (ret != 0) {
945 av_log(s->avctx, AV_LOG_ERROR, "decode problem on frame %d, @ block (%d, %d)\n",
946 s->avctx->frame_number, x, y);
947 return;
948 }
949 }
950 }
951 if (bytestream2_get_bytes_left(&s->stream_ptr) > 1) {
952 av_log(s->avctx, AV_LOG_ERROR,
953 "decode finished with %d bytes left over\n",
954 bytestream2_get_bytes_left(&s->stream_ptr));
955 }
956}
957
958static av_cold int ipvideo_decode_init(AVCodecContext *avctx)
959{
960 IpvideoContext *s = avctx->priv_data;
961
962 s->avctx = avctx;
963
964 s->is_16bpp = avctx->bits_per_coded_sample == 16;
965 avctx->pix_fmt = s->is_16bpp ? AV_PIX_FMT_RGB555 : AV_PIX_FMT_PAL8;
966
967 ff_hpeldsp_init(&s->hdsp, avctx->flags);
968
969 s->last_frame = av_frame_alloc();
970 s->second_last_frame = av_frame_alloc();
971 if (!s->last_frame || !s->second_last_frame) {
972 av_frame_free(&s->last_frame);
973 av_frame_free(&s->second_last_frame);
974 return AVERROR(ENOMEM);
975 }
976
977 return 0;
978}
979
980static int ipvideo_decode_frame(AVCodecContext *avctx,
981 void *data, int *got_frame,
982 AVPacket *avpkt)
983{
984 const uint8_t *buf = avpkt->data;
985 int buf_size = avpkt->size;
986 IpvideoContext *s = avctx->priv_data;
987 AVFrame *frame = data;
988 int ret;
989
990 /* decoding map contains 4 bits of information per 8x8 block */
991 s->decoding_map_size = avctx->width * avctx->height / (8 * 8 * 2);
992
993 /* compressed buffer needs to be large enough to at least hold an entire
994 * decoding map */
995 if (buf_size < s->decoding_map_size)
996 return buf_size;
997
998 if (av_packet_get_side_data(avpkt, AV_PKT_DATA_PARAM_CHANGE, NULL)) {
999 av_frame_unref(s->last_frame);
1000 av_frame_unref(s->second_last_frame);
1001 }
1002
1003 s->decoding_map = buf;
1004 bytestream2_init(&s->stream_ptr, buf + s->decoding_map_size,
1005 buf_size - s->decoding_map_size);
1006
1007 if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
1008 return ret;
1009
1010 if (!s->is_16bpp) {
1011 const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
1012 if (pal) {
1013 frame->palette_has_changed = 1;
1014 memcpy(s->pal, pal, AVPALETTE_SIZE);
1015 }
1016 }
1017
1018 ipvideo_decode_opcodes(s, frame);
1019
1020 *got_frame = 1;
1021
1022 /* shuffle frames */
1023 av_frame_unref(s->second_last_frame);
1024 FFSWAP(AVFrame*, s->second_last_frame, s->last_frame);
1025 if ((ret = av_frame_ref(s->last_frame, frame)) < 0)
1026 return ret;
1027
1028 /* report that the buffer was completely consumed */
1029 return buf_size;
1030}
1031
1032static av_cold int ipvideo_decode_end(AVCodecContext *avctx)
1033{
1034 IpvideoContext *s = avctx->priv_data;
1035
1036 av_frame_free(&s->last_frame);
1037 av_frame_free(&s->second_last_frame);
1038
1039 return 0;
1040}
1041
1042AVCodec ff_interplay_video_decoder = {
1043 .name = "interplayvideo",
1044 .long_name = NULL_IF_CONFIG_SMALL("Interplay MVE video"),
1045 .type = AVMEDIA_TYPE_VIDEO,
1046 .id = AV_CODEC_ID_INTERPLAY_VIDEO,
1047 .priv_data_size = sizeof(IpvideoContext),
1048 .init = ipvideo_decode_init,
1049 .close = ipvideo_decode_end,
1050 .decode = ipvideo_decode_frame,
1051 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_PARAM_CHANGE,
1052};
ffmpeg Piment Noir Debian package repository