1 /*
2 * Duck TrueMotion 1.0 Decoder
3 * Copyright (C) 2003 Alex Beregszaszi & Mike Melanson
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 * Duck TrueMotion v1 Video Decoder by
25 * Alex Beregszaszi and
26 * Mike Melanson (melanson@pcisys.net)
27 *
28 * The TrueMotion v1 decoder presently only decodes 16-bit TM1 data and
29 * outputs RGB555 (or RGB565) data. 24-bit TM1 data is not supported yet.
30 */
31
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <string.h>
35
36 #include "avcodec.h"
37 #include "codec_internal.h"
38 #include "internal.h"
39 #include "libavutil/imgutils.h"
40 #include "libavutil/internal.h"
41 #include "libavutil/intreadwrite.h"
42 #include "libavutil/mem.h"
43
44 #include "truemotion1data.h"
45
46 typedef struct TrueMotion1Context {
47 AVCodecContext *avctx;
48 AVFrame *frame;
49
50 const uint8_t *buf;
51 int size;
52
53 const uint8_t *mb_change_bits;
54 int mb_change_bits_row_size;
55 const uint8_t *index_stream;
56 int index_stream_size;
57
58 int flags;
59 int x, y, w, h;
60
61 uint32_t y_predictor_table[1024];
62 uint32_t c_predictor_table[1024];
63 uint32_t fat_y_predictor_table[1024];
64 uint32_t fat_c_predictor_table[1024];
65
66 int compression;
67 int block_type;
68 int block_width;
69 int block_height;
70
71 int16_t ydt[8];
72 int16_t cdt[8];
73 int16_t fat_ydt[8];
74 int16_t fat_cdt[8];
75
76 int last_deltaset, last_vectable;
77
78 unsigned int *vert_pred;
79 int vert_pred_size;
80
81 } TrueMotion1Context;
82
83 #define FLAG_SPRITE 32
84 #define FLAG_KEYFRAME 16
85 #define FLAG_INTERFRAME 8
86 #define FLAG_INTERPOLATED 4
87
88 struct frame_header {
89 uint8_t header_size;
90 uint8_t compression;
91 uint8_t deltaset;
92 uint8_t vectable;
93 uint16_t ysize;
94 uint16_t xsize;
95 uint16_t checksum;
96 uint8_t version;
97 uint8_t header_type;
98 uint8_t flags;
99 uint8_t control;
100 uint16_t xoffset;
101 uint16_t yoffset;
102 uint16_t width;
103 uint16_t height;
104 };
105
106 #define ALGO_NOP 0
107 #define ALGO_RGB16V 1
108 #define ALGO_RGB16H 2
109 #define ALGO_RGB24H 3
110
111 /* these are the various block sizes that can occupy a 4x4 block */
112 #define BLOCK_2x2 0
113 #define BLOCK_2x4 1
114 #define BLOCK_4x2 2
115 #define BLOCK_4x4 3
116
117 typedef struct comp_types {
118 int algorithm;
119 int block_width; // vres
120 int block_height; // hres
121 int block_type;
122 } comp_types;
123
124 /* { valid for metatype }, algorithm, num of deltas, vert res, horiz res */
125 static const comp_types compression_types[17] = {
126 { ALGO_NOP, 0, 0, 0 },
127
128 { ALGO_RGB16V, 4, 4, BLOCK_4x4 },
129 { ALGO_RGB16H, 4, 4, BLOCK_4x4 },
130 { ALGO_RGB16V, 4, 2, BLOCK_4x2 },
131 { ALGO_RGB16H, 4, 2, BLOCK_4x2 },
132
133 { ALGO_RGB16V, 2, 4, BLOCK_2x4 },
134 { ALGO_RGB16H, 2, 4, BLOCK_2x4 },
135 { ALGO_RGB16V, 2, 2, BLOCK_2x2 },
136 { ALGO_RGB16H, 2, 2, BLOCK_2x2 },
137
138 { ALGO_NOP, 4, 4, BLOCK_4x4 },
139 { ALGO_RGB24H, 4, 4, BLOCK_4x4 },
140 { ALGO_NOP, 4, 2, BLOCK_4x2 },
141 { ALGO_RGB24H, 4, 2, BLOCK_4x2 },
142
143 { ALGO_NOP, 2, 4, BLOCK_2x4 },
144 { ALGO_RGB24H, 2, 4, BLOCK_2x4 },
145 { ALGO_NOP, 2, 2, BLOCK_2x2 },
146 { ALGO_RGB24H, 2, 2, BLOCK_2x2 }
147 };
148
select_delta_tables(TrueMotion1Context * s,int delta_table_index)149 static void select_delta_tables(TrueMotion1Context *s, int delta_table_index)
150 {
151 int i;
152
153 if (delta_table_index > 3)
154 return;
155
156 memcpy(s->ydt, ydts[delta_table_index], 8 * sizeof(int16_t));
157 memcpy(s->cdt, cdts[delta_table_index], 8 * sizeof(int16_t));
158 memcpy(s->fat_ydt, fat_ydts[delta_table_index], 8 * sizeof(int16_t));
159 memcpy(s->fat_cdt, fat_cdts[delta_table_index], 8 * sizeof(int16_t));
160
161 /* Y skinny deltas need to be halved for some reason; maybe the
162 * skinny Y deltas should be modified */
163 for (i = 0; i < 8; i++)
164 {
165 /* drop the lsb before dividing by 2-- net effect: round down
166 * when dividing a negative number (e.g., -3/2 = -2, not -1) */
167 s->ydt[i] &= 0xFFFE;
168 s->ydt[i] /= 2;
169 }
170 }
171
172 #if HAVE_BIGENDIAN
make_ydt15_entry(int p2,int p1,int16_t * ydt)173 static int make_ydt15_entry(int p2, int p1, int16_t *ydt)
174 #else
175 static int make_ydt15_entry(int p1, int p2, int16_t *ydt)
176 #endif
177 {
178 int lo, hi;
179
180 lo = ydt[p1];
181 lo += (lo * 32) + (lo * 1024);
182 hi = ydt[p2];
183 hi += (hi * 32) + (hi * 1024);
184 return (lo + (hi * (1U << 16))) * 2;
185 }
186
make_cdt15_entry(int p1,int p2,int16_t * cdt)187 static int make_cdt15_entry(int p1, int p2, int16_t *cdt)
188 {
189 int r, b, lo;
190
191 b = cdt[p2];
192 r = cdt[p1] * 1024;
193 lo = b + r;
194 return (lo + (lo * (1U << 16))) * 2;
195 }
196
197 #if HAVE_BIGENDIAN
make_ydt16_entry(int p2,int p1,int16_t * ydt)198 static int make_ydt16_entry(int p2, int p1, int16_t *ydt)
199 #else
200 static int make_ydt16_entry(int p1, int p2, int16_t *ydt)
201 #endif
202 {
203 int lo, hi;
204
205 lo = ydt[p1];
206 lo += (lo << 6) + (lo << 11);
207 hi = ydt[p2];
208 hi += (hi << 6) + (hi << 11);
209 return (lo + (hi << 16)) << 1;
210 }
211
make_cdt16_entry(int p1,int p2,int16_t * cdt)212 static int make_cdt16_entry(int p1, int p2, int16_t *cdt)
213 {
214 int r, b, lo;
215
216 b = cdt[p2];
217 r = cdt[p1] << 11;
218 lo = b + r;
219 return (lo + (lo * (1 << 16))) * 2;
220 }
221
make_ydt24_entry(int p1,int p2,int16_t * ydt)222 static int make_ydt24_entry(int p1, int p2, int16_t *ydt)
223 {
224 int lo, hi;
225
226 lo = ydt[p1];
227 hi = ydt[p2];
228 return (lo + (hi * (1 << 8)) + (hi * (1 << 16))) * 2;
229 }
230
make_cdt24_entry(int p1,int p2,int16_t * cdt)231 static int make_cdt24_entry(int p1, int p2, int16_t *cdt)
232 {
233 int r, b;
234
235 b = cdt[p2];
236 r = cdt[p1] * (1 << 16);
237 return (b+r) * 2;
238 }
239
gen_vector_table15(TrueMotion1Context * s,const uint8_t * sel_vector_table)240 static void gen_vector_table15(TrueMotion1Context *s, const uint8_t *sel_vector_table)
241 {
242 int len, i, j;
243 unsigned char delta_pair;
244
245 for (i = 0; i < 1024; i += 4)
246 {
247 len = *sel_vector_table++ / 2;
248 for (j = 0; j < len; j++)
249 {
250 delta_pair = *sel_vector_table++;
251 s->y_predictor_table[i+j] = 0xfffffffe &
252 make_ydt15_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
253 s->c_predictor_table[i+j] = 0xfffffffe &
254 make_cdt15_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
255 }
256 s->y_predictor_table[i+(j-1)] |= 1;
257 s->c_predictor_table[i+(j-1)] |= 1;
258 }
259 }
260
gen_vector_table16(TrueMotion1Context * s,const uint8_t * sel_vector_table)261 static void gen_vector_table16(TrueMotion1Context *s, const uint8_t *sel_vector_table)
262 {
263 int len, i, j;
264 unsigned char delta_pair;
265
266 for (i = 0; i < 1024; i += 4)
267 {
268 len = *sel_vector_table++ / 2;
269 for (j = 0; j < len; j++)
270 {
271 delta_pair = *sel_vector_table++;
272 s->y_predictor_table[i+j] = 0xfffffffe &
273 make_ydt16_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
274 s->c_predictor_table[i+j] = 0xfffffffe &
275 make_cdt16_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
276 }
277 s->y_predictor_table[i+(j-1)] |= 1;
278 s->c_predictor_table[i+(j-1)] |= 1;
279 }
280 }
281
gen_vector_table24(TrueMotion1Context * s,const uint8_t * sel_vector_table)282 static void gen_vector_table24(TrueMotion1Context *s, const uint8_t *sel_vector_table)
283 {
284 int len, i, j;
285 unsigned char delta_pair;
286
287 for (i = 0; i < 1024; i += 4)
288 {
289 len = *sel_vector_table++ / 2;
290 for (j = 0; j < len; j++)
291 {
292 delta_pair = *sel_vector_table++;
293 s->y_predictor_table[i+j] = 0xfffffffe &
294 make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
295 s->c_predictor_table[i+j] = 0xfffffffe &
296 make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
297 s->fat_y_predictor_table[i+j] = 0xfffffffe &
298 make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_ydt);
299 s->fat_c_predictor_table[i+j] = 0xfffffffe &
300 make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_cdt);
301 }
302 s->y_predictor_table[i+(j-1)] |= 1;
303 s->c_predictor_table[i+(j-1)] |= 1;
304 s->fat_y_predictor_table[i+(j-1)] |= 1;
305 s->fat_c_predictor_table[i+(j-1)] |= 1;
306 }
307 }
308
309 /* Returns the number of bytes consumed from the bytestream. Returns -1 if
310 * there was an error while decoding the header */
truemotion1_decode_header(TrueMotion1Context * s)311 static int truemotion1_decode_header(TrueMotion1Context *s)
312 {
313 int i, ret;
314 int width_shift = 0;
315 int new_pix_fmt;
316 struct frame_header header;
317 uint8_t header_buffer[128] = { 0 }; /* logical maximum size of the header */
318 const uint8_t *sel_vector_table;
319
320 header.header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f;
321 if (s->buf[0] < 0x10)
322 {
323 av_log(s->avctx, AV_LOG_ERROR, "invalid header size (%d)\n", s->buf[0]);
324 return AVERROR_INVALIDDATA;
325 }
326
327 if (header.header_size + 1 > s->size) {
328 av_log(s->avctx, AV_LOG_ERROR, "Input packet too small.\n");
329 return AVERROR_INVALIDDATA;
330 }
331
332 /* unscramble the header bytes with a XOR operation */
333 for (i = 1; i < header.header_size; i++)
334 header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1];
335
336 header.compression = header_buffer[0];
337 header.deltaset = header_buffer[1];
338 header.vectable = header_buffer[2];
339 header.ysize = AV_RL16(&header_buffer[3]);
340 header.xsize = AV_RL16(&header_buffer[5]);
341 header.checksum = AV_RL16(&header_buffer[7]);
342 header.version = header_buffer[9];
343 header.header_type = header_buffer[10];
344 header.flags = header_buffer[11];
345 header.control = header_buffer[12];
346
347 /* Version 2 */
348 if (header.version >= 2)
349 {
350 if (header.header_type > 3)
351 {
352 av_log(s->avctx, AV_LOG_ERROR, "invalid header type (%d)\n", header.header_type);
353 return AVERROR_INVALIDDATA;
354 } else if ((header.header_type == 2) || (header.header_type == 3)) {
355 s->flags = header.flags;
356 if (!(s->flags & FLAG_INTERFRAME))
357 s->flags |= FLAG_KEYFRAME;
358 } else
359 s->flags = FLAG_KEYFRAME;
360 } else /* Version 1 */
361 s->flags = FLAG_KEYFRAME;
362
363 if (s->flags & FLAG_SPRITE) {
364 avpriv_request_sample(s->avctx, "Frame with sprite");
365 /* FIXME header.width, height, xoffset and yoffset aren't initialized */
366 return AVERROR_PATCHWELCOME;
367 } else {
368 s->w = header.xsize;
369 s->h = header.ysize;
370 if (header.header_type < 2) {
371 if ((s->w < 213) && (s->h >= 176))
372 {
373 s->flags |= FLAG_INTERPOLATED;
374 avpriv_request_sample(s->avctx, "Interpolated frame");
375 }
376 }
377 }
378
379 if (header.compression >= 17) {
380 av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression);
381 return AVERROR_INVALIDDATA;
382 }
383
384 if ((header.deltaset != s->last_deltaset) ||
385 (header.vectable != s->last_vectable))
386 select_delta_tables(s, header.deltaset);
387
388 if ((header.compression & 1) && header.header_type)
389 sel_vector_table = pc_tbl2;
390 else {
391 if (header.vectable > 0 && header.vectable < 4)
392 sel_vector_table = tables[header.vectable - 1];
393 else {
394 av_log(s->avctx, AV_LOG_ERROR, "invalid vector table id (%d)\n", header.vectable);
395 return AVERROR_INVALIDDATA;
396 }
397 }
398
399 if (compression_types[header.compression].algorithm == ALGO_RGB24H) {
400 new_pix_fmt = AV_PIX_FMT_0RGB32;
401 width_shift = 1;
402 } else
403 new_pix_fmt = AV_PIX_FMT_RGB555; // RGB565 is supported as well
404
405 s->w >>= width_shift;
406 if (s->w & 1) {
407 avpriv_request_sample(s->avctx, "Frame with odd width");
408 return AVERROR_PATCHWELCOME;
409 }
410
411 if (s->w != s->avctx->width || s->h != s->avctx->height ||
412 new_pix_fmt != s->avctx->pix_fmt) {
413 av_frame_unref(s->frame);
414 s->avctx->sample_aspect_ratio = (AVRational){ 1 << width_shift, 1 };
415 s->avctx->pix_fmt = new_pix_fmt;
416
417 if ((ret = ff_set_dimensions(s->avctx, s->w, s->h)) < 0)
418 return ret;
419
420 ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
421
422 av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
423 if (!s->vert_pred)
424 return AVERROR(ENOMEM);
425 }
426
427 /* There is 1 change bit per 4 pixels, so each change byte represents
428 * 32 pixels; divide width by 4 to obtain the number of change bits and
429 * then round up to the nearest byte. */
430 s->mb_change_bits_row_size = ((s->avctx->width >> (2 - width_shift)) + 7) >> 3;
431
432 if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable))
433 {
434 if (compression_types[header.compression].algorithm == ALGO_RGB24H)
435 gen_vector_table24(s, sel_vector_table);
436 else
437 if (s->avctx->pix_fmt == AV_PIX_FMT_RGB555)
438 gen_vector_table15(s, sel_vector_table);
439 else
440 gen_vector_table16(s, sel_vector_table);
441 }
442
443 /* set up pointers to the other key data chunks */
444 s->mb_change_bits = s->buf + header.header_size;
445 if (s->flags & FLAG_KEYFRAME) {
446 /* no change bits specified for a keyframe; only index bytes */
447 s->index_stream = s->mb_change_bits;
448 if (s->avctx->width * s->avctx->height / 2048 + header.header_size > s->size)
449 return AVERROR_INVALIDDATA;
450 } else {
451 /* one change bit per 4x4 block */
452 s->index_stream = s->mb_change_bits +
453 (s->mb_change_bits_row_size * (s->avctx->height >> 2));
454 }
455 s->index_stream_size = s->size - (s->index_stream - s->buf);
456
457 s->last_deltaset = header.deltaset;
458 s->last_vectable = header.vectable;
459 s->compression = header.compression;
460 s->block_width = compression_types[header.compression].block_width;
461 s->block_height = compression_types[header.compression].block_height;
462 s->block_type = compression_types[header.compression].block_type;
463
464 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
465 av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n",
466 s->last_deltaset, s->last_vectable, s->compression, s->block_width,
467 s->block_height, s->block_type,
468 s->flags & FLAG_KEYFRAME ? " KEY" : "",
469 s->flags & FLAG_INTERFRAME ? " INTER" : "",
470 s->flags & FLAG_SPRITE ? " SPRITE" : "",
471 s->flags & FLAG_INTERPOLATED ? " INTERPOL" : "");
472
473 return header.header_size;
474 }
475
truemotion1_decode_init(AVCodecContext * avctx)476 static av_cold int truemotion1_decode_init(AVCodecContext *avctx)
477 {
478 TrueMotion1Context *s = avctx->priv_data;
479
480 s->avctx = avctx;
481
482 // FIXME: it may change ?
483 // if (avctx->bits_per_sample == 24)
484 // avctx->pix_fmt = AV_PIX_FMT_RGB24;
485 // else
486 // avctx->pix_fmt = AV_PIX_FMT_RGB555;
487
488 s->frame = av_frame_alloc();
489 if (!s->frame)
490 return AVERROR(ENOMEM);
491
492 /* there is a vertical predictor for each pixel in a line; each vertical
493 * predictor is 0 to start with */
494 av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
495 if (!s->vert_pred)
496 return AVERROR(ENOMEM);
497
498 return 0;
499 }
500
501 /*
502 Block decoding order:
503
504 dxi: Y-Y
505 dxic: Y-C-Y
506 dxic2: Y-C-Y-C
507
508 hres,vres,i,i%vres (0 < i < 4)
509 2x2 0: 0 dxic2
510 2x2 1: 1 dxi
511 2x2 2: 0 dxic2
512 2x2 3: 1 dxi
513 2x4 0: 0 dxic2
514 2x4 1: 1 dxi
515 2x4 2: 2 dxi
516 2x4 3: 3 dxi
517 4x2 0: 0 dxic
518 4x2 1: 1 dxi
519 4x2 2: 0 dxic
520 4x2 3: 1 dxi
521 4x4 0: 0 dxic
522 4x4 1: 1 dxi
523 4x4 2: 2 dxi
524 4x4 3: 3 dxi
525 */
526
527 #define GET_NEXT_INDEX() \
528 {\
529 if (index_stream_index >= s->index_stream_size) { \
530 av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \
531 return; \
532 } \
533 index = s->index_stream[index_stream_index++] * 4; \
534 }
535
536 #define INC_INDEX \
537 do { \
538 if (index >= 1023) { \
539 av_log(s->avctx, AV_LOG_ERROR, "Invalid index value.\n"); \
540 return; \
541 } \
542 index++; \
543 } while (0)
544
545 #define APPLY_C_PREDICTOR() \
546 predictor_pair = s->c_predictor_table[index]; \
547 horiz_pred += (predictor_pair >> 1); \
548 if (predictor_pair & 1) { \
549 GET_NEXT_INDEX() \
550 if (!index) { \
551 GET_NEXT_INDEX() \
552 predictor_pair = s->c_predictor_table[index]; \
553 horiz_pred += ((predictor_pair >> 1) * 5); \
554 if (predictor_pair & 1) \
555 GET_NEXT_INDEX() \
556 else \
557 INC_INDEX; \
558 } \
559 } else \
560 INC_INDEX;
561
562 #define APPLY_C_PREDICTOR_24() \
563 predictor_pair = s->c_predictor_table[index]; \
564 horiz_pred += (predictor_pair >> 1); \
565 if (predictor_pair & 1) { \
566 GET_NEXT_INDEX() \
567 if (!index) { \
568 GET_NEXT_INDEX() \
569 predictor_pair = s->fat_c_predictor_table[index]; \
570 horiz_pred += (predictor_pair >> 1); \
571 if (predictor_pair & 1) \
572 GET_NEXT_INDEX() \
573 else \
574 INC_INDEX; \
575 } \
576 } else \
577 INC_INDEX;
578
579
580 #define APPLY_Y_PREDICTOR() \
581 predictor_pair = s->y_predictor_table[index]; \
582 horiz_pred += (predictor_pair >> 1); \
583 if (predictor_pair & 1) { \
584 GET_NEXT_INDEX() \
585 if (!index) { \
586 GET_NEXT_INDEX() \
587 predictor_pair = s->y_predictor_table[index]; \
588 horiz_pred += ((predictor_pair >> 1) * 5); \
589 if (predictor_pair & 1) \
590 GET_NEXT_INDEX() \
591 else \
592 INC_INDEX; \
593 } \
594 } else \
595 INC_INDEX;
596
597 #define APPLY_Y_PREDICTOR_24() \
598 predictor_pair = s->y_predictor_table[index]; \
599 horiz_pred += (predictor_pair >> 1); \
600 if (predictor_pair & 1) { \
601 GET_NEXT_INDEX() \
602 if (!index) { \
603 GET_NEXT_INDEX() \
604 predictor_pair = s->fat_y_predictor_table[index]; \
605 horiz_pred += (predictor_pair >> 1); \
606 if (predictor_pair & 1) \
607 GET_NEXT_INDEX() \
608 else \
609 INC_INDEX; \
610 } \
611 } else \
612 INC_INDEX;
613
614 #define OUTPUT_PIXEL_PAIR() \
615 *current_pixel_pair = *vert_pred + horiz_pred; \
616 *vert_pred++ = *current_pixel_pair++;
617
truemotion1_decode_16bit(TrueMotion1Context * s)618 static void truemotion1_decode_16bit(TrueMotion1Context *s)
619 {
620 int y;
621 int pixels_left; /* remaining pixels on this line */
622 unsigned int predictor_pair;
623 unsigned int horiz_pred;
624 unsigned int *vert_pred;
625 unsigned int *current_pixel_pair;
626 unsigned char *current_line = s->frame->data[0];
627 int keyframe = s->flags & FLAG_KEYFRAME;
628
629 /* these variables are for managing the stream of macroblock change bits */
630 const unsigned char *mb_change_bits = s->mb_change_bits;
631 unsigned char mb_change_byte;
632 unsigned char mb_change_byte_mask;
633 int mb_change_index;
634
635 /* these variables are for managing the main index stream */
636 int index_stream_index = 0; /* yes, the index into the index stream */
637 int index;
638
639 /* clean out the line buffer */
640 memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
641
642 GET_NEXT_INDEX();
643
644 for (y = 0; y < s->avctx->height; y++) {
645
646 /* re-init variables for the next line iteration */
647 horiz_pred = 0;
648 current_pixel_pair = (unsigned int *)current_line;
649 vert_pred = s->vert_pred;
650 mb_change_index = 0;
651 if (!keyframe)
652 mb_change_byte = mb_change_bits[mb_change_index++];
653 mb_change_byte_mask = 0x01;
654 pixels_left = s->avctx->width;
655
656 while (pixels_left > 0) {
657
658 if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
659
660 switch (y & 3) {
661 case 0:
662 /* if macroblock width is 2, apply C-Y-C-Y; else
663 * apply C-Y-Y */
664 if (s->block_width == 2) {
665 APPLY_C_PREDICTOR();
666 APPLY_Y_PREDICTOR();
667 OUTPUT_PIXEL_PAIR();
668 APPLY_C_PREDICTOR();
669 APPLY_Y_PREDICTOR();
670 OUTPUT_PIXEL_PAIR();
671 } else {
672 APPLY_C_PREDICTOR();
673 APPLY_Y_PREDICTOR();
674 OUTPUT_PIXEL_PAIR();
675 APPLY_Y_PREDICTOR();
676 OUTPUT_PIXEL_PAIR();
677 }
678 break;
679
680 case 1:
681 case 3:
682 /* always apply 2 Y predictors on these iterations */
683 APPLY_Y_PREDICTOR();
684 OUTPUT_PIXEL_PAIR();
685 APPLY_Y_PREDICTOR();
686 OUTPUT_PIXEL_PAIR();
687 break;
688
689 case 2:
690 /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
691 * depending on the macroblock type */
692 if (s->block_type == BLOCK_2x2) {
693 APPLY_C_PREDICTOR();
694 APPLY_Y_PREDICTOR();
695 OUTPUT_PIXEL_PAIR();
696 APPLY_C_PREDICTOR();
697 APPLY_Y_PREDICTOR();
698 OUTPUT_PIXEL_PAIR();
699 } else if (s->block_type == BLOCK_4x2) {
700 APPLY_C_PREDICTOR();
701 APPLY_Y_PREDICTOR();
702 OUTPUT_PIXEL_PAIR();
703 APPLY_Y_PREDICTOR();
704 OUTPUT_PIXEL_PAIR();
705 } else {
706 APPLY_Y_PREDICTOR();
707 OUTPUT_PIXEL_PAIR();
708 APPLY_Y_PREDICTOR();
709 OUTPUT_PIXEL_PAIR();
710 }
711 break;
712 }
713
714 } else {
715
716 /* skip (copy) four pixels, but reassign the horizontal
717 * predictor */
718 *vert_pred++ = *current_pixel_pair++;
719 horiz_pred = *current_pixel_pair - *vert_pred;
720 *vert_pred++ = *current_pixel_pair++;
721
722 }
723
724 if (!keyframe) {
725 mb_change_byte_mask <<= 1;
726
727 /* next byte */
728 if (!mb_change_byte_mask) {
729 mb_change_byte = mb_change_bits[mb_change_index++];
730 mb_change_byte_mask = 0x01;
731 }
732 }
733
734 pixels_left -= 4;
735 }
736
737 /* next change row */
738 if (((y + 1) & 3) == 0)
739 mb_change_bits += s->mb_change_bits_row_size;
740
741 current_line += s->frame->linesize[0];
742 }
743 }
744
truemotion1_decode_24bit(TrueMotion1Context * s)745 static void truemotion1_decode_24bit(TrueMotion1Context *s)
746 {
747 int y;
748 int pixels_left; /* remaining pixels on this line */
749 unsigned int predictor_pair;
750 unsigned int horiz_pred;
751 unsigned int *vert_pred;
752 unsigned int *current_pixel_pair;
753 unsigned char *current_line = s->frame->data[0];
754 int keyframe = s->flags & FLAG_KEYFRAME;
755
756 /* these variables are for managing the stream of macroblock change bits */
757 const unsigned char *mb_change_bits = s->mb_change_bits;
758 unsigned char mb_change_byte;
759 unsigned char mb_change_byte_mask;
760 int mb_change_index;
761
762 /* these variables are for managing the main index stream */
763 int index_stream_index = 0; /* yes, the index into the index stream */
764 int index;
765
766 /* clean out the line buffer */
767 memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
768
769 GET_NEXT_INDEX();
770
771 for (y = 0; y < s->avctx->height; y++) {
772
773 /* re-init variables for the next line iteration */
774 horiz_pred = 0;
775 current_pixel_pair = (unsigned int *)current_line;
776 vert_pred = s->vert_pred;
777 mb_change_index = 0;
778 mb_change_byte = mb_change_bits[mb_change_index++];
779 mb_change_byte_mask = 0x01;
780 pixels_left = s->avctx->width;
781
782 while (pixels_left > 0) {
783
784 if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
785
786 switch (y & 3) {
787 case 0:
788 /* if macroblock width is 2, apply C-Y-C-Y; else
789 * apply C-Y-Y */
790 if (s->block_width == 2) {
791 APPLY_C_PREDICTOR_24();
792 APPLY_Y_PREDICTOR_24();
793 OUTPUT_PIXEL_PAIR();
794 APPLY_C_PREDICTOR_24();
795 APPLY_Y_PREDICTOR_24();
796 OUTPUT_PIXEL_PAIR();
797 } else {
798 APPLY_C_PREDICTOR_24();
799 APPLY_Y_PREDICTOR_24();
800 OUTPUT_PIXEL_PAIR();
801 APPLY_Y_PREDICTOR_24();
802 OUTPUT_PIXEL_PAIR();
803 }
804 break;
805
806 case 1:
807 case 3:
808 /* always apply 2 Y predictors on these iterations */
809 APPLY_Y_PREDICTOR_24();
810 OUTPUT_PIXEL_PAIR();
811 APPLY_Y_PREDICTOR_24();
812 OUTPUT_PIXEL_PAIR();
813 break;
814
815 case 2:
816 /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
817 * depending on the macroblock type */
818 if (s->block_type == BLOCK_2x2) {
819 APPLY_C_PREDICTOR_24();
820 APPLY_Y_PREDICTOR_24();
821 OUTPUT_PIXEL_PAIR();
822 APPLY_C_PREDICTOR_24();
823 APPLY_Y_PREDICTOR_24();
824 OUTPUT_PIXEL_PAIR();
825 } else if (s->block_type == BLOCK_4x2) {
826 APPLY_C_PREDICTOR_24();
827 APPLY_Y_PREDICTOR_24();
828 OUTPUT_PIXEL_PAIR();
829 APPLY_Y_PREDICTOR_24();
830 OUTPUT_PIXEL_PAIR();
831 } else {
832 APPLY_Y_PREDICTOR_24();
833 OUTPUT_PIXEL_PAIR();
834 APPLY_Y_PREDICTOR_24();
835 OUTPUT_PIXEL_PAIR();
836 }
837 break;
838 }
839
840 } else {
841
842 /* skip (copy) four pixels, but reassign the horizontal
843 * predictor */
844 *vert_pred++ = *current_pixel_pair++;
845 horiz_pred = *current_pixel_pair - *vert_pred;
846 *vert_pred++ = *current_pixel_pair++;
847
848 }
849
850 if (!keyframe) {
851 mb_change_byte_mask <<= 1;
852
853 /* next byte */
854 if (!mb_change_byte_mask) {
855 mb_change_byte = mb_change_bits[mb_change_index++];
856 mb_change_byte_mask = 0x01;
857 }
858 }
859
860 pixels_left -= 2;
861 }
862
863 /* next change row */
864 if (((y + 1) & 3) == 0)
865 mb_change_bits += s->mb_change_bits_row_size;
866
867 current_line += s->frame->linesize[0];
868 }
869 }
870
871
truemotion1_decode_frame(AVCodecContext * avctx,AVFrame * rframe,int * got_frame,AVPacket * avpkt)872 static int truemotion1_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
873 int *got_frame, AVPacket *avpkt)
874 {
875 const uint8_t *buf = avpkt->data;
876 int ret, buf_size = avpkt->size;
877 TrueMotion1Context *s = avctx->priv_data;
878
879 s->buf = buf;
880 s->size = buf_size;
881
882 if ((ret = truemotion1_decode_header(s)) < 0)
883 return ret;
884
885 if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
886 return ret;
887
888 if (compression_types[s->compression].algorithm == ALGO_RGB24H) {
889 truemotion1_decode_24bit(s);
890 } else if (compression_types[s->compression].algorithm != ALGO_NOP) {
891 truemotion1_decode_16bit(s);
892 }
893
894 if ((ret = av_frame_ref(rframe, s->frame)) < 0)
895 return ret;
896
897 *got_frame = 1;
898
899 /* report that the buffer was completely consumed */
900 return buf_size;
901 }
902
truemotion1_decode_end(AVCodecContext * avctx)903 static av_cold int truemotion1_decode_end(AVCodecContext *avctx)
904 {
905 TrueMotion1Context *s = avctx->priv_data;
906
907 av_frame_free(&s->frame);
908 av_freep(&s->vert_pred);
909
910 return 0;
911 }
912
913 const FFCodec ff_truemotion1_decoder = {
914 .p.name = "truemotion1",
915 .p.long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 1.0"),
916 .p.type = AVMEDIA_TYPE_VIDEO,
917 .p.id = AV_CODEC_ID_TRUEMOTION1,
918 .priv_data_size = sizeof(TrueMotion1Context),
919 .init = truemotion1_decode_init,
920 .close = truemotion1_decode_end,
921 FF_CODEC_DECODE_CB(truemotion1_decode_frame),
922 .p.capabilities = AV_CODEC_CAP_DR1,
923 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
924 };
925