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 "internal.h"
38 #include "libavutil/imgutils.h"
39 #include "libavutil/internal.h"
40 #include "libavutil/intreadwrite.h"
41 #include "libavutil/mem.h"
42
43 #include "truemotion1data.h"
44
45 typedef struct TrueMotion1Context {
46 AVCodecContext *avctx;
47 AVFrame *frame;
48
49 const uint8_t *buf;
50 int size;
51
52 const uint8_t *mb_change_bits;
53 int mb_change_bits_row_size;
54 const uint8_t *index_stream;
55 int index_stream_size;
56
57 int flags;
58 int x, y, w, h;
59
60 uint32_t y_predictor_table[1024];
61 uint32_t c_predictor_table[1024];
62 uint32_t fat_y_predictor_table[1024];
63 uint32_t fat_c_predictor_table[1024];
64
65 int compression;
66 int block_type;
67 int block_width;
68 int block_height;
69
70 int16_t ydt[8];
71 int16_t cdt[8];
72 int16_t fat_ydt[8];
73 int16_t fat_cdt[8];
74
75 int last_deltaset, last_vectable;
76
77 unsigned int *vert_pred;
78 int vert_pred_size;
79
80 } TrueMotion1Context;
81
82 #define FLAG_SPRITE 32
83 #define FLAG_KEYFRAME 16
84 #define FLAG_INTERFRAME 8
85 #define FLAG_INTERPOLATED 4
86
87 struct frame_header {
88 uint8_t header_size;
89 uint8_t compression;
90 uint8_t deltaset;
91 uint8_t vectable;
92 uint16_t ysize;
93 uint16_t xsize;
94 uint16_t checksum;
95 uint8_t version;
96 uint8_t header_type;
97 uint8_t flags;
98 uint8_t control;
99 uint16_t xoffset;
100 uint16_t yoffset;
101 uint16_t width;
102 uint16_t height;
103 };
104
105 #define ALGO_NOP 0
106 #define ALGO_RGB16V 1
107 #define ALGO_RGB16H 2
108 #define ALGO_RGB24H 3
109
110 /* these are the various block sizes that can occupy a 4x4 block */
111 #define BLOCK_2x2 0
112 #define BLOCK_2x4 1
113 #define BLOCK_4x2 2
114 #define BLOCK_4x4 3
115
116 typedef struct comp_types {
117 int algorithm;
118 int block_width; // vres
119 int block_height; // hres
120 int block_type;
121 } comp_types;
122
123 /* { valid for metatype }, algorithm, num of deltas, vert res, horiz res */
124 static const comp_types compression_types[17] = {
125 { ALGO_NOP, 0, 0, 0 },
126
127 { ALGO_RGB16V, 4, 4, BLOCK_4x4 },
128 { ALGO_RGB16H, 4, 4, BLOCK_4x4 },
129 { ALGO_RGB16V, 4, 2, BLOCK_4x2 },
130 { ALGO_RGB16H, 4, 2, BLOCK_4x2 },
131
132 { ALGO_RGB16V, 2, 4, BLOCK_2x4 },
133 { ALGO_RGB16H, 2, 4, BLOCK_2x4 },
134 { ALGO_RGB16V, 2, 2, BLOCK_2x2 },
135 { ALGO_RGB16H, 2, 2, BLOCK_2x2 },
136
137 { ALGO_NOP, 4, 4, BLOCK_4x4 },
138 { ALGO_RGB24H, 4, 4, BLOCK_4x4 },
139 { ALGO_NOP, 4, 2, BLOCK_4x2 },
140 { ALGO_RGB24H, 4, 2, BLOCK_4x2 },
141
142 { ALGO_NOP, 2, 4, BLOCK_2x4 },
143 { ALGO_RGB24H, 2, 4, BLOCK_2x4 },
144 { ALGO_NOP, 2, 2, BLOCK_2x2 },
145 { ALGO_RGB24H, 2, 2, BLOCK_2x2 }
146 };
147
select_delta_tables(TrueMotion1Context * s,int delta_table_index)148 static void select_delta_tables(TrueMotion1Context *s, int delta_table_index)
149 {
150 int i;
151
152 if (delta_table_index > 3)
153 return;
154
155 memcpy(s->ydt, ydts[delta_table_index], 8 * sizeof(int16_t));
156 memcpy(s->cdt, cdts[delta_table_index], 8 * sizeof(int16_t));
157 memcpy(s->fat_ydt, fat_ydts[delta_table_index], 8 * sizeof(int16_t));
158 memcpy(s->fat_cdt, fat_cdts[delta_table_index], 8 * sizeof(int16_t));
159
160 /* Y skinny deltas need to be halved for some reason; maybe the
161 * skinny Y deltas should be modified */
162 for (i = 0; i < 8; i++)
163 {
164 /* drop the lsb before dividing by 2-- net effect: round down
165 * when dividing a negative number (e.g., -3/2 = -2, not -1) */
166 s->ydt[i] &= 0xFFFE;
167 s->ydt[i] /= 2;
168 }
169 }
170
171 #if HAVE_BIGENDIAN
make_ydt15_entry(int p2,int p1,int16_t * ydt)172 static int make_ydt15_entry(int p2, int p1, int16_t *ydt)
173 #else
174 static int make_ydt15_entry(int p1, int p2, int16_t *ydt)
175 #endif
176 {
177 int lo, hi;
178
179 lo = ydt[p1];
180 lo += (lo * 32) + (lo * 1024);
181 hi = ydt[p2];
182 hi += (hi * 32) + (hi * 1024);
183 return (lo + (hi * (1U << 16))) * 2;
184 }
185
make_cdt15_entry(int p1,int p2,int16_t * cdt)186 static int make_cdt15_entry(int p1, int p2, int16_t *cdt)
187 {
188 int r, b, lo;
189
190 b = cdt[p2];
191 r = cdt[p1] * 1024;
192 lo = b + r;
193 return (lo + (lo * (1U << 16))) * 2;
194 }
195
196 #if HAVE_BIGENDIAN
make_ydt16_entry(int p2,int p1,int16_t * ydt)197 static int make_ydt16_entry(int p2, int p1, int16_t *ydt)
198 #else
199 static int make_ydt16_entry(int p1, int p2, int16_t *ydt)
200 #endif
201 {
202 int lo, hi;
203
204 lo = ydt[p1];
205 lo += (lo << 6) + (lo << 11);
206 hi = ydt[p2];
207 hi += (hi << 6) + (hi << 11);
208 return (lo + (hi << 16)) << 1;
209 }
210
make_cdt16_entry(int p1,int p2,int16_t * cdt)211 static int make_cdt16_entry(int p1, int p2, int16_t *cdt)
212 {
213 int r, b, lo;
214
215 b = cdt[p2];
216 r = cdt[p1] << 11;
217 lo = b + r;
218 return (lo + (lo * (1 << 16))) * 2;
219 }
220
make_ydt24_entry(int p1,int p2,int16_t * ydt)221 static int make_ydt24_entry(int p1, int p2, int16_t *ydt)
222 {
223 int lo, hi;
224
225 lo = ydt[p1];
226 hi = ydt[p2];
227 return (lo + (hi * (1 << 8)) + (hi * (1 << 16))) * 2;
228 }
229
make_cdt24_entry(int p1,int p2,int16_t * cdt)230 static int make_cdt24_entry(int p1, int p2, int16_t *cdt)
231 {
232 int r, b;
233
234 b = cdt[p2];
235 r = cdt[p1] * (1 << 16);
236 return (b+r) * 2;
237 }
238
gen_vector_table15(TrueMotion1Context * s,const uint8_t * sel_vector_table)239 static void gen_vector_table15(TrueMotion1Context *s, const uint8_t *sel_vector_table)
240 {
241 int len, i, j;
242 unsigned char delta_pair;
243
244 for (i = 0; i < 1024; i += 4)
245 {
246 len = *sel_vector_table++ / 2;
247 for (j = 0; j < len; j++)
248 {
249 delta_pair = *sel_vector_table++;
250 s->y_predictor_table[i+j] = 0xfffffffe &
251 make_ydt15_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
252 s->c_predictor_table[i+j] = 0xfffffffe &
253 make_cdt15_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
254 }
255 s->y_predictor_table[i+(j-1)] |= 1;
256 s->c_predictor_table[i+(j-1)] |= 1;
257 }
258 }
259
gen_vector_table16(TrueMotion1Context * s,const uint8_t * sel_vector_table)260 static void gen_vector_table16(TrueMotion1Context *s, const uint8_t *sel_vector_table)
261 {
262 int len, i, j;
263 unsigned char delta_pair;
264
265 for (i = 0; i < 1024; i += 4)
266 {
267 len = *sel_vector_table++ / 2;
268 for (j = 0; j < len; j++)
269 {
270 delta_pair = *sel_vector_table++;
271 s->y_predictor_table[i+j] = 0xfffffffe &
272 make_ydt16_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
273 s->c_predictor_table[i+j] = 0xfffffffe &
274 make_cdt16_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
275 }
276 s->y_predictor_table[i+(j-1)] |= 1;
277 s->c_predictor_table[i+(j-1)] |= 1;
278 }
279 }
280
gen_vector_table24(TrueMotion1Context * s,const uint8_t * sel_vector_table)281 static void gen_vector_table24(TrueMotion1Context *s, const uint8_t *sel_vector_table)
282 {
283 int len, i, j;
284 unsigned char delta_pair;
285
286 for (i = 0; i < 1024; i += 4)
287 {
288 len = *sel_vector_table++ / 2;
289 for (j = 0; j < len; j++)
290 {
291 delta_pair = *sel_vector_table++;
292 s->y_predictor_table[i+j] = 0xfffffffe &
293 make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
294 s->c_predictor_table[i+j] = 0xfffffffe &
295 make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
296 s->fat_y_predictor_table[i+j] = 0xfffffffe &
297 make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_ydt);
298 s->fat_c_predictor_table[i+j] = 0xfffffffe &
299 make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_cdt);
300 }
301 s->y_predictor_table[i+(j-1)] |= 1;
302 s->c_predictor_table[i+(j-1)] |= 1;
303 s->fat_y_predictor_table[i+(j-1)] |= 1;
304 s->fat_c_predictor_table[i+(j-1)] |= 1;
305 }
306 }
307
308 /* Returns the number of bytes consumed from the bytestream. Returns -1 if
309 * there was an error while decoding the header */
truemotion1_decode_header(TrueMotion1Context * s)310 static int truemotion1_decode_header(TrueMotion1Context *s)
311 {
312 int i, ret;
313 int width_shift = 0;
314 int new_pix_fmt;
315 struct frame_header header;
316 uint8_t header_buffer[128] = { 0 }; /* logical maximum size of the header */
317 const uint8_t *sel_vector_table;
318
319 header.header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f;
320 if (s->buf[0] < 0x10)
321 {
322 av_log(s->avctx, AV_LOG_ERROR, "invalid header size (%d)\n", s->buf[0]);
323 return AVERROR_INVALIDDATA;
324 }
325
326 if (header.header_size + 1 > s->size) {
327 av_log(s->avctx, AV_LOG_ERROR, "Input packet too small.\n");
328 return AVERROR_INVALIDDATA;
329 }
330
331 /* unscramble the header bytes with a XOR operation */
332 for (i = 1; i < header.header_size; i++)
333 header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1];
334
335 header.compression = header_buffer[0];
336 header.deltaset = header_buffer[1];
337 header.vectable = header_buffer[2];
338 header.ysize = AV_RL16(&header_buffer[3]);
339 header.xsize = AV_RL16(&header_buffer[5]);
340 header.checksum = AV_RL16(&header_buffer[7]);
341 header.version = header_buffer[9];
342 header.header_type = header_buffer[10];
343 header.flags = header_buffer[11];
344 header.control = header_buffer[12];
345
346 /* Version 2 */
347 if (header.version >= 2)
348 {
349 if (header.header_type > 3)
350 {
351 av_log(s->avctx, AV_LOG_ERROR, "invalid header type (%d)\n", header.header_type);
352 return AVERROR_INVALIDDATA;
353 } else if ((header.header_type == 2) || (header.header_type == 3)) {
354 s->flags = header.flags;
355 if (!(s->flags & FLAG_INTERFRAME))
356 s->flags |= FLAG_KEYFRAME;
357 } else
358 s->flags = FLAG_KEYFRAME;
359 } else /* Version 1 */
360 s->flags = FLAG_KEYFRAME;
361
362 if (s->flags & FLAG_SPRITE) {
363 avpriv_request_sample(s->avctx, "Frame with sprite");
364 /* FIXME header.width, height, xoffset and yoffset aren't initialized */
365 return AVERROR_PATCHWELCOME;
366 } else {
367 s->w = header.xsize;
368 s->h = header.ysize;
369 if (header.header_type < 2) {
370 if ((s->w < 213) && (s->h >= 176))
371 {
372 s->flags |= FLAG_INTERPOLATED;
373 avpriv_request_sample(s->avctx, "Interpolated frame");
374 }
375 }
376 }
377
378 if (header.compression >= 17) {
379 av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression);
380 return AVERROR_INVALIDDATA;
381 }
382
383 if ((header.deltaset != s->last_deltaset) ||
384 (header.vectable != s->last_vectable))
385 select_delta_tables(s, header.deltaset);
386
387 if ((header.compression & 1) && header.header_type)
388 sel_vector_table = pc_tbl2;
389 else {
390 if (header.vectable > 0 && header.vectable < 4)
391 sel_vector_table = tables[header.vectable - 1];
392 else {
393 av_log(s->avctx, AV_LOG_ERROR, "invalid vector table id (%d)\n", header.vectable);
394 return AVERROR_INVALIDDATA;
395 }
396 }
397
398 if (compression_types[header.compression].algorithm == ALGO_RGB24H) {
399 new_pix_fmt = AV_PIX_FMT_0RGB32;
400 width_shift = 1;
401 } else
402 new_pix_fmt = AV_PIX_FMT_RGB555; // RGB565 is supported as well
403
404 s->w >>= width_shift;
405 if (s->w & 1) {
406 avpriv_request_sample(s->avctx, "Frame with odd width");
407 return AVERROR_PATCHWELCOME;
408 }
409
410 if (s->w != s->avctx->width || s->h != s->avctx->height ||
411 new_pix_fmt != s->avctx->pix_fmt) {
412 av_frame_unref(s->frame);
413 s->avctx->sample_aspect_ratio = (AVRational){ 1 << width_shift, 1 };
414 s->avctx->pix_fmt = new_pix_fmt;
415
416 if ((ret = ff_set_dimensions(s->avctx, s->w, s->h)) < 0)
417 return ret;
418
419 ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
420
421 av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
422 if (!s->vert_pred)
423 return AVERROR(ENOMEM);
424 }
425
426 /* There is 1 change bit per 4 pixels, so each change byte represents
427 * 32 pixels; divide width by 4 to obtain the number of change bits and
428 * then round up to the nearest byte. */
429 s->mb_change_bits_row_size = ((s->avctx->width >> (2 - width_shift)) + 7) >> 3;
430
431 if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable))
432 {
433 if (compression_types[header.compression].algorithm == ALGO_RGB24H)
434 gen_vector_table24(s, sel_vector_table);
435 else
436 if (s->avctx->pix_fmt == AV_PIX_FMT_RGB555)
437 gen_vector_table15(s, sel_vector_table);
438 else
439 gen_vector_table16(s, sel_vector_table);
440 }
441
442 /* set up pointers to the other key data chunks */
443 s->mb_change_bits = s->buf + header.header_size;
444 if (s->flags & FLAG_KEYFRAME) {
445 /* no change bits specified for a keyframe; only index bytes */
446 s->index_stream = s->mb_change_bits;
447 if (s->avctx->width * s->avctx->height / 2048 + header.header_size > s->size)
448 return AVERROR_INVALIDDATA;
449 } else {
450 /* one change bit per 4x4 block */
451 s->index_stream = s->mb_change_bits +
452 (s->mb_change_bits_row_size * (s->avctx->height >> 2));
453 }
454 s->index_stream_size = s->size - (s->index_stream - s->buf);
455
456 s->last_deltaset = header.deltaset;
457 s->last_vectable = header.vectable;
458 s->compression = header.compression;
459 s->block_width = compression_types[header.compression].block_width;
460 s->block_height = compression_types[header.compression].block_height;
461 s->block_type = compression_types[header.compression].block_type;
462
463 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
464 av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n",
465 s->last_deltaset, s->last_vectable, s->compression, s->block_width,
466 s->block_height, s->block_type,
467 s->flags & FLAG_KEYFRAME ? " KEY" : "",
468 s->flags & FLAG_INTERFRAME ? " INTER" : "",
469 s->flags & FLAG_SPRITE ? " SPRITE" : "",
470 s->flags & FLAG_INTERPOLATED ? " INTERPOL" : "");
471
472 return header.header_size;
473 }
474
truemotion1_decode_init(AVCodecContext * avctx)475 static av_cold int truemotion1_decode_init(AVCodecContext *avctx)
476 {
477 TrueMotion1Context *s = avctx->priv_data;
478
479 s->avctx = avctx;
480
481 // FIXME: it may change ?
482 // if (avctx->bits_per_sample == 24)
483 // avctx->pix_fmt = AV_PIX_FMT_RGB24;
484 // else
485 // avctx->pix_fmt = AV_PIX_FMT_RGB555;
486
487 s->frame = av_frame_alloc();
488 if (!s->frame)
489 return AVERROR(ENOMEM);
490
491 /* there is a vertical predictor for each pixel in a line; each vertical
492 * predictor is 0 to start with */
493 av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
494 if (!s->vert_pred) {
495 av_frame_free(&s->frame);
496 return AVERROR(ENOMEM);
497 }
498
499 return 0;
500 }
501
502 /*
503 Block decoding order:
504
505 dxi: Y-Y
506 dxic: Y-C-Y
507 dxic2: Y-C-Y-C
508
509 hres,vres,i,i%vres (0 < i < 4)
510 2x2 0: 0 dxic2
511 2x2 1: 1 dxi
512 2x2 2: 0 dxic2
513 2x2 3: 1 dxi
514 2x4 0: 0 dxic2
515 2x4 1: 1 dxi
516 2x4 2: 2 dxi
517 2x4 3: 3 dxi
518 4x2 0: 0 dxic
519 4x2 1: 1 dxi
520 4x2 2: 0 dxic
521 4x2 3: 1 dxi
522 4x4 0: 0 dxic
523 4x4 1: 1 dxi
524 4x4 2: 2 dxi
525 4x4 3: 3 dxi
526 */
527
528 #define GET_NEXT_INDEX() \
529 {\
530 if (index_stream_index >= s->index_stream_size) { \
531 av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \
532 return; \
533 } \
534 index = s->index_stream[index_stream_index++] * 4; \
535 }
536
537 #define INC_INDEX \
538 do { \
539 if (index >= 1023) { \
540 av_log(s->avctx, AV_LOG_ERROR, "Invalid index value.\n"); \
541 return; \
542 } \
543 index++; \
544 } while (0)
545
546 #define APPLY_C_PREDICTOR() \
547 predictor_pair = s->c_predictor_table[index]; \
548 horiz_pred += (predictor_pair >> 1); \
549 if (predictor_pair & 1) { \
550 GET_NEXT_INDEX() \
551 if (!index) { \
552 GET_NEXT_INDEX() \
553 predictor_pair = s->c_predictor_table[index]; \
554 horiz_pred += ((predictor_pair >> 1) * 5); \
555 if (predictor_pair & 1) \
556 GET_NEXT_INDEX() \
557 else \
558 INC_INDEX; \
559 } \
560 } else \
561 INC_INDEX;
562
563 #define APPLY_C_PREDICTOR_24() \
564 predictor_pair = s->c_predictor_table[index]; \
565 horiz_pred += (predictor_pair >> 1); \
566 if (predictor_pair & 1) { \
567 GET_NEXT_INDEX() \
568 if (!index) { \
569 GET_NEXT_INDEX() \
570 predictor_pair = s->fat_c_predictor_table[index]; \
571 horiz_pred += (predictor_pair >> 1); \
572 if (predictor_pair & 1) \
573 GET_NEXT_INDEX() \
574 else \
575 INC_INDEX; \
576 } \
577 } else \
578 INC_INDEX;
579
580
581 #define APPLY_Y_PREDICTOR() \
582 predictor_pair = s->y_predictor_table[index]; \
583 horiz_pred += (predictor_pair >> 1); \
584 if (predictor_pair & 1) { \
585 GET_NEXT_INDEX() \
586 if (!index) { \
587 GET_NEXT_INDEX() \
588 predictor_pair = s->y_predictor_table[index]; \
589 horiz_pred += ((predictor_pair >> 1) * 5); \
590 if (predictor_pair & 1) \
591 GET_NEXT_INDEX() \
592 else \
593 INC_INDEX; \
594 } \
595 } else \
596 INC_INDEX;
597
598 #define APPLY_Y_PREDICTOR_24() \
599 predictor_pair = s->y_predictor_table[index]; \
600 horiz_pred += (predictor_pair >> 1); \
601 if (predictor_pair & 1) { \
602 GET_NEXT_INDEX() \
603 if (!index) { \
604 GET_NEXT_INDEX() \
605 predictor_pair = s->fat_y_predictor_table[index]; \
606 horiz_pred += (predictor_pair >> 1); \
607 if (predictor_pair & 1) \
608 GET_NEXT_INDEX() \
609 else \
610 INC_INDEX; \
611 } \
612 } else \
613 INC_INDEX;
614
615 #define OUTPUT_PIXEL_PAIR() \
616 *current_pixel_pair = *vert_pred + horiz_pred; \
617 *vert_pred++ = *current_pixel_pair++;
618
truemotion1_decode_16bit(TrueMotion1Context * s)619 static void truemotion1_decode_16bit(TrueMotion1Context *s)
620 {
621 int y;
622 int pixels_left; /* remaining pixels on this line */
623 unsigned int predictor_pair;
624 unsigned int horiz_pred;
625 unsigned int *vert_pred;
626 unsigned int *current_pixel_pair;
627 unsigned char *current_line = s->frame->data[0];
628 int keyframe = s->flags & FLAG_KEYFRAME;
629
630 /* these variables are for managing the stream of macroblock change bits */
631 const unsigned char *mb_change_bits = s->mb_change_bits;
632 unsigned char mb_change_byte;
633 unsigned char mb_change_byte_mask;
634 int mb_change_index;
635
636 /* these variables are for managing the main index stream */
637 int index_stream_index = 0; /* yes, the index into the index stream */
638 int index;
639
640 /* clean out the line buffer */
641 memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
642
643 GET_NEXT_INDEX();
644
645 for (y = 0; y < s->avctx->height; y++) {
646
647 /* re-init variables for the next line iteration */
648 horiz_pred = 0;
649 current_pixel_pair = (unsigned int *)current_line;
650 vert_pred = s->vert_pred;
651 mb_change_index = 0;
652 if (!keyframe)
653 mb_change_byte = mb_change_bits[mb_change_index++];
654 mb_change_byte_mask = 0x01;
655 pixels_left = s->avctx->width;
656
657 while (pixels_left > 0) {
658
659 if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
660
661 switch (y & 3) {
662 case 0:
663 /* if macroblock width is 2, apply C-Y-C-Y; else
664 * apply C-Y-Y */
665 if (s->block_width == 2) {
666 APPLY_C_PREDICTOR();
667 APPLY_Y_PREDICTOR();
668 OUTPUT_PIXEL_PAIR();
669 APPLY_C_PREDICTOR();
670 APPLY_Y_PREDICTOR();
671 OUTPUT_PIXEL_PAIR();
672 } else {
673 APPLY_C_PREDICTOR();
674 APPLY_Y_PREDICTOR();
675 OUTPUT_PIXEL_PAIR();
676 APPLY_Y_PREDICTOR();
677 OUTPUT_PIXEL_PAIR();
678 }
679 break;
680
681 case 1:
682 case 3:
683 /* always apply 2 Y predictors on these iterations */
684 APPLY_Y_PREDICTOR();
685 OUTPUT_PIXEL_PAIR();
686 APPLY_Y_PREDICTOR();
687 OUTPUT_PIXEL_PAIR();
688 break;
689
690 case 2:
691 /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
692 * depending on the macroblock type */
693 if (s->block_type == BLOCK_2x2) {
694 APPLY_C_PREDICTOR();
695 APPLY_Y_PREDICTOR();
696 OUTPUT_PIXEL_PAIR();
697 APPLY_C_PREDICTOR();
698 APPLY_Y_PREDICTOR();
699 OUTPUT_PIXEL_PAIR();
700 } else if (s->block_type == BLOCK_4x2) {
701 APPLY_C_PREDICTOR();
702 APPLY_Y_PREDICTOR();
703 OUTPUT_PIXEL_PAIR();
704 APPLY_Y_PREDICTOR();
705 OUTPUT_PIXEL_PAIR();
706 } else {
707 APPLY_Y_PREDICTOR();
708 OUTPUT_PIXEL_PAIR();
709 APPLY_Y_PREDICTOR();
710 OUTPUT_PIXEL_PAIR();
711 }
712 break;
713 }
714
715 } else {
716
717 /* skip (copy) four pixels, but reassign the horizontal
718 * predictor */
719 *vert_pred++ = *current_pixel_pair++;
720 horiz_pred = *current_pixel_pair - *vert_pred;
721 *vert_pred++ = *current_pixel_pair++;
722
723 }
724
725 if (!keyframe) {
726 mb_change_byte_mask <<= 1;
727
728 /* next byte */
729 if (!mb_change_byte_mask) {
730 mb_change_byte = mb_change_bits[mb_change_index++];
731 mb_change_byte_mask = 0x01;
732 }
733 }
734
735 pixels_left -= 4;
736 }
737
738 /* next change row */
739 if (((y + 1) & 3) == 0)
740 mb_change_bits += s->mb_change_bits_row_size;
741
742 current_line += s->frame->linesize[0];
743 }
744 }
745
truemotion1_decode_24bit(TrueMotion1Context * s)746 static void truemotion1_decode_24bit(TrueMotion1Context *s)
747 {
748 int y;
749 int pixels_left; /* remaining pixels on this line */
750 unsigned int predictor_pair;
751 unsigned int horiz_pred;
752 unsigned int *vert_pred;
753 unsigned int *current_pixel_pair;
754 unsigned char *current_line = s->frame->data[0];
755 int keyframe = s->flags & FLAG_KEYFRAME;
756
757 /* these variables are for managing the stream of macroblock change bits */
758 const unsigned char *mb_change_bits = s->mb_change_bits;
759 unsigned char mb_change_byte;
760 unsigned char mb_change_byte_mask;
761 int mb_change_index;
762
763 /* these variables are for managing the main index stream */
764 int index_stream_index = 0; /* yes, the index into the index stream */
765 int index;
766
767 /* clean out the line buffer */
768 memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
769
770 GET_NEXT_INDEX();
771
772 for (y = 0; y < s->avctx->height; y++) {
773
774 /* re-init variables for the next line iteration */
775 horiz_pred = 0;
776 current_pixel_pair = (unsigned int *)current_line;
777 vert_pred = s->vert_pred;
778 mb_change_index = 0;
779 mb_change_byte = mb_change_bits[mb_change_index++];
780 mb_change_byte_mask = 0x01;
781 pixels_left = s->avctx->width;
782
783 while (pixels_left > 0) {
784
785 if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
786
787 switch (y & 3) {
788 case 0:
789 /* if macroblock width is 2, apply C-Y-C-Y; else
790 * apply C-Y-Y */
791 if (s->block_width == 2) {
792 APPLY_C_PREDICTOR_24();
793 APPLY_Y_PREDICTOR_24();
794 OUTPUT_PIXEL_PAIR();
795 APPLY_C_PREDICTOR_24();
796 APPLY_Y_PREDICTOR_24();
797 OUTPUT_PIXEL_PAIR();
798 } else {
799 APPLY_C_PREDICTOR_24();
800 APPLY_Y_PREDICTOR_24();
801 OUTPUT_PIXEL_PAIR();
802 APPLY_Y_PREDICTOR_24();
803 OUTPUT_PIXEL_PAIR();
804 }
805 break;
806
807 case 1:
808 case 3:
809 /* always apply 2 Y predictors on these iterations */
810 APPLY_Y_PREDICTOR_24();
811 OUTPUT_PIXEL_PAIR();
812 APPLY_Y_PREDICTOR_24();
813 OUTPUT_PIXEL_PAIR();
814 break;
815
816 case 2:
817 /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
818 * depending on the macroblock type */
819 if (s->block_type == BLOCK_2x2) {
820 APPLY_C_PREDICTOR_24();
821 APPLY_Y_PREDICTOR_24();
822 OUTPUT_PIXEL_PAIR();
823 APPLY_C_PREDICTOR_24();
824 APPLY_Y_PREDICTOR_24();
825 OUTPUT_PIXEL_PAIR();
826 } else if (s->block_type == BLOCK_4x2) {
827 APPLY_C_PREDICTOR_24();
828 APPLY_Y_PREDICTOR_24();
829 OUTPUT_PIXEL_PAIR();
830 APPLY_Y_PREDICTOR_24();
831 OUTPUT_PIXEL_PAIR();
832 } else {
833 APPLY_Y_PREDICTOR_24();
834 OUTPUT_PIXEL_PAIR();
835 APPLY_Y_PREDICTOR_24();
836 OUTPUT_PIXEL_PAIR();
837 }
838 break;
839 }
840
841 } else {
842
843 /* skip (copy) four pixels, but reassign the horizontal
844 * predictor */
845 *vert_pred++ = *current_pixel_pair++;
846 horiz_pred = *current_pixel_pair - *vert_pred;
847 *vert_pred++ = *current_pixel_pair++;
848
849 }
850
851 if (!keyframe) {
852 mb_change_byte_mask <<= 1;
853
854 /* next byte */
855 if (!mb_change_byte_mask) {
856 mb_change_byte = mb_change_bits[mb_change_index++];
857 mb_change_byte_mask = 0x01;
858 }
859 }
860
861 pixels_left -= 2;
862 }
863
864 /* next change row */
865 if (((y + 1) & 3) == 0)
866 mb_change_bits += s->mb_change_bits_row_size;
867
868 current_line += s->frame->linesize[0];
869 }
870 }
871
872
truemotion1_decode_frame(AVCodecContext * avctx,void * data,int * got_frame,AVPacket * avpkt)873 static int truemotion1_decode_frame(AVCodecContext *avctx,
874 void *data, int *got_frame,
875 AVPacket *avpkt)
876 {
877 const uint8_t *buf = avpkt->data;
878 int ret, buf_size = avpkt->size;
879 TrueMotion1Context *s = avctx->priv_data;
880
881 s->buf = buf;
882 s->size = buf_size;
883
884 if ((ret = truemotion1_decode_header(s)) < 0)
885 return ret;
886
887 if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
888 return ret;
889
890 if (compression_types[s->compression].algorithm == ALGO_RGB24H) {
891 truemotion1_decode_24bit(s);
892 } else if (compression_types[s->compression].algorithm != ALGO_NOP) {
893 truemotion1_decode_16bit(s);
894 }
895
896 if ((ret = av_frame_ref(data, s->frame)) < 0)
897 return ret;
898
899 *got_frame = 1;
900
901 /* report that the buffer was completely consumed */
902 return buf_size;
903 }
904
truemotion1_decode_end(AVCodecContext * avctx)905 static av_cold int truemotion1_decode_end(AVCodecContext *avctx)
906 {
907 TrueMotion1Context *s = avctx->priv_data;
908
909 av_frame_free(&s->frame);
910 av_freep(&s->vert_pred);
911
912 return 0;
913 }
914
915 AVCodec ff_truemotion1_decoder = {
916 .name = "truemotion1",
917 .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 1.0"),
918 .type = AVMEDIA_TYPE_VIDEO,
919 .id = AV_CODEC_ID_TRUEMOTION1,
920 .priv_data_size = sizeof(TrueMotion1Context),
921 .init = truemotion1_decode_init,
922 .close = truemotion1_decode_end,
923 .decode = truemotion1_decode_frame,
924 .capabilities = AV_CODEC_CAP_DR1,
925 };
926