c2e15894e4f2021e9176c441e5ffa61be08c5166
[libav.git] / libavcodec / truemotion1.c
1 /*
2 * Duck TrueMotion 1.0 Decoder
3 * Copyright (C) 2003 Alex Beregszaszi & Mike Melanson
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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 "dsputil.h"
38 #include "libavutil/imgutils.h"
39 #include "libavutil/internal.h"
40 #include "libavutil/mem.h"
41
42 #include "truemotion1data.h"
43
44 typedef struct TrueMotion1Context {
45 AVCodecContext *avctx;
46 AVFrame frame;
47
48 const uint8_t *buf;
49 int size;
50
51 const uint8_t *mb_change_bits;
52 int mb_change_bits_row_size;
53 const uint8_t *index_stream;
54 int index_stream_size;
55
56 int flags;
57 int x, y, w, h;
58
59 uint32_t y_predictor_table[1024];
60 uint32_t c_predictor_table[1024];
61 uint32_t fat_y_predictor_table[1024];
62 uint32_t fat_c_predictor_table[1024];
63
64 int compression;
65 int block_type;
66 int block_width;
67 int block_height;
68
69 int16_t ydt[8];
70 int16_t cdt[8];
71 int16_t fat_ydt[8];
72 int16_t fat_cdt[8];
73
74 int last_deltaset, last_vectable;
75
76 unsigned int *vert_pred;
77 int vert_pred_size;
78
79 } TrueMotion1Context;
80
81 #define FLAG_SPRITE 32
82 #define FLAG_KEYFRAME 16
83 #define FLAG_INTERFRAME 8
84 #define FLAG_INTERPOLATED 4
85
86 struct frame_header {
87 uint8_t header_size;
88 uint8_t compression;
89 uint8_t deltaset;
90 uint8_t vectable;
91 uint16_t ysize;
92 uint16_t xsize;
93 uint16_t checksum;
94 uint8_t version;
95 uint8_t header_type;
96 uint8_t flags;
97 uint8_t control;
98 uint16_t xoffset;
99 uint16_t yoffset;
100 uint16_t width;
101 uint16_t height;
102 };
103
104 #define ALGO_NOP 0
105 #define ALGO_RGB16V 1
106 #define ALGO_RGB16H 2
107 #define ALGO_RGB24H 3
108
109 /* these are the various block sizes that can occupy a 4x4 block */
110 #define BLOCK_2x2 0
111 #define BLOCK_2x4 1
112 #define BLOCK_4x2 2
113 #define BLOCK_4x4 3
114
115 typedef struct comp_types {
116 int algorithm;
117 int block_width; // vres
118 int block_height; // hres
119 int block_type;
120 } comp_types;
121
122 /* { valid for metatype }, algorithm, num of deltas, vert res, horiz res */
123 static const comp_types compression_types[17] = {
124 { ALGO_NOP, 0, 0, 0 },
125
126 { ALGO_RGB16V, 4, 4, BLOCK_4x4 },
127 { ALGO_RGB16H, 4, 4, BLOCK_4x4 },
128 { ALGO_RGB16V, 4, 2, BLOCK_4x2 },
129 { ALGO_RGB16H, 4, 2, BLOCK_4x2 },
130
131 { ALGO_RGB16V, 2, 4, BLOCK_2x4 },
132 { ALGO_RGB16H, 2, 4, BLOCK_2x4 },
133 { ALGO_RGB16V, 2, 2, BLOCK_2x2 },
134 { ALGO_RGB16H, 2, 2, BLOCK_2x2 },
135
136 { ALGO_NOP, 4, 4, BLOCK_4x4 },
137 { ALGO_RGB24H, 4, 4, BLOCK_4x4 },
138 { ALGO_NOP, 4, 2, BLOCK_4x2 },
139 { ALGO_RGB24H, 4, 2, BLOCK_4x2 },
140
141 { ALGO_NOP, 2, 4, BLOCK_2x4 },
142 { ALGO_RGB24H, 2, 4, BLOCK_2x4 },
143 { ALGO_NOP, 2, 2, BLOCK_2x2 },
144 { ALGO_RGB24H, 2, 2, BLOCK_2x2 }
145 };
146
147 static void select_delta_tables(TrueMotion1Context *s, int delta_table_index)
148 {
149 int i;
150
151 if (delta_table_index > 3)
152 return;
153
154 memcpy(s->ydt, ydts[delta_table_index], 8 * sizeof(int16_t));
155 memcpy(s->cdt, cdts[delta_table_index], 8 * sizeof(int16_t));
156 memcpy(s->fat_ydt, fat_ydts[delta_table_index], 8 * sizeof(int16_t));
157 memcpy(s->fat_cdt, fat_cdts[delta_table_index], 8 * sizeof(int16_t));
158
159 /* Y skinny deltas need to be halved for some reason; maybe the
160 * skinny Y deltas should be modified */
161 for (i = 0; i < 8; i++)
162 {
163 /* drop the lsb before dividing by 2-- net effect: round down
164 * when dividing a negative number (e.g., -3/2 = -2, not -1) */
165 s->ydt[i] &= 0xFFFE;
166 s->ydt[i] /= 2;
167 }
168 }
169
170 #if HAVE_BIGENDIAN
171 static int make_ydt15_entry(int p2, int p1, int16_t *ydt)
172 #else
173 static int make_ydt15_entry(int p1, int p2, int16_t *ydt)
174 #endif
175 {
176 int lo, hi;
177
178 lo = ydt[p1];
179 lo += (lo << 5) + (lo << 10);
180 hi = ydt[p2];
181 hi += (hi << 5) + (hi << 10);
182 return (lo + (hi << 16)) << 1;
183 }
184
185 static int make_cdt15_entry(int p1, int p2, int16_t *cdt)
186 {
187 int r, b, lo;
188
189 b = cdt[p2];
190 r = cdt[p1] << 10;
191 lo = b + r;
192 return (lo + (lo << 16)) << 1;
193 }
194
195 #if HAVE_BIGENDIAN
196 static int make_ydt16_entry(int p2, int p1, int16_t *ydt)
197 #else
198 static int make_ydt16_entry(int p1, int p2, int16_t *ydt)
199 #endif
200 {
201 int lo, hi;
202
203 lo = ydt[p1];
204 lo += (lo << 6) + (lo << 11);
205 hi = ydt[p2];
206 hi += (hi << 6) + (hi << 11);
207 return (lo + (hi << 16)) << 1;
208 }
209
210 static int make_cdt16_entry(int p1, int p2, int16_t *cdt)
211 {
212 int r, b, lo;
213
214 b = cdt[p2];
215 r = cdt[p1] << 11;
216 lo = b + r;
217 return (lo + (lo << 16)) << 1;
218 }
219
220 static int make_ydt24_entry(int p1, int p2, int16_t *ydt)
221 {
222 int lo, hi;
223
224 lo = ydt[p1];
225 hi = ydt[p2];
226 return (lo + (hi << 8) + (hi << 16)) << 1;
227 }
228
229 static int make_cdt24_entry(int p1, int p2, int16_t *cdt)
230 {
231 int r, b;
232
233 b = cdt[p2];
234 r = cdt[p1]<<16;
235 return (b+r) << 1;
236 }
237
238 static void gen_vector_table15(TrueMotion1Context *s, const uint8_t *sel_vector_table)
239 {
240 int len, i, j;
241 unsigned char delta_pair;
242
243 for (i = 0; i < 1024; i += 4)
244 {
245 len = *sel_vector_table++ / 2;
246 for (j = 0; j < len; j++)
247 {
248 delta_pair = *sel_vector_table++;
249 s->y_predictor_table[i+j] = 0xfffffffe &
250 make_ydt15_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
251 s->c_predictor_table[i+j] = 0xfffffffe &
252 make_cdt15_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
253 }
254 s->y_predictor_table[i+(j-1)] |= 1;
255 s->c_predictor_table[i+(j-1)] |= 1;
256 }
257 }
258
259 static void gen_vector_table16(TrueMotion1Context *s, const uint8_t *sel_vector_table)
260 {
261 int len, i, j;
262 unsigned char delta_pair;
263
264 for (i = 0; i < 1024; i += 4)
265 {
266 len = *sel_vector_table++ / 2;
267 for (j = 0; j < len; j++)
268 {
269 delta_pair = *sel_vector_table++;
270 s->y_predictor_table[i+j] = 0xfffffffe &
271 make_ydt16_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
272 s->c_predictor_table[i+j] = 0xfffffffe &
273 make_cdt16_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
274 }
275 s->y_predictor_table[i+(j-1)] |= 1;
276 s->c_predictor_table[i+(j-1)] |= 1;
277 }
278 }
279
280 static void gen_vector_table24(TrueMotion1Context *s, const uint8_t *sel_vector_table)
281 {
282 int len, i, j;
283 unsigned char delta_pair;
284
285 for (i = 0; i < 1024; i += 4)
286 {
287 len = *sel_vector_table++ / 2;
288 for (j = 0; j < len; j++)
289 {
290 delta_pair = *sel_vector_table++;
291 s->y_predictor_table[i+j] = 0xfffffffe &
292 make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
293 s->c_predictor_table[i+j] = 0xfffffffe &
294 make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
295 s->fat_y_predictor_table[i+j] = 0xfffffffe &
296 make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_ydt);
297 s->fat_c_predictor_table[i+j] = 0xfffffffe &
298 make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_cdt);
299 }
300 s->y_predictor_table[i+(j-1)] |= 1;
301 s->c_predictor_table[i+(j-1)] |= 1;
302 s->fat_y_predictor_table[i+(j-1)] |= 1;
303 s->fat_c_predictor_table[i+(j-1)] |= 1;
304 }
305 }
306
307 /* Returns the number of bytes consumed from the bytestream. Returns -1 if
308 * there was an error while decoding the header */
309 static int truemotion1_decode_header(TrueMotion1Context *s)
310 {
311 int i;
312 int width_shift = 0;
313 int new_pix_fmt;
314 struct frame_header header;
315 uint8_t header_buffer[128] = { 0 }; /* logical maximum size of the header */
316 const uint8_t *sel_vector_table;
317
318 header.header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f;
319 if (s->buf[0] < 0x10)
320 {
321 av_log(s->avctx, AV_LOG_ERROR, "invalid header size (%d)\n", s->buf[0]);
322 return -1;
323 }
324
325 /* unscramble the header bytes with a XOR operation */
326 for (i = 1; i < header.header_size; i++)
327 header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1];
328
329 header.compression = header_buffer[0];
330 header.deltaset = header_buffer[1];
331 header.vectable = header_buffer[2];
332 header.ysize = AV_RL16(&header_buffer[3]);
333 header.xsize = AV_RL16(&header_buffer[5]);
334 header.checksum = AV_RL16(&header_buffer[7]);
335 header.version = header_buffer[9];
336 header.header_type = header_buffer[10];
337 header.flags = header_buffer[11];
338 header.control = header_buffer[12];
339
340 /* Version 2 */
341 if (header.version >= 2)
342 {
343 if (header.header_type > 3)
344 {
345 av_log(s->avctx, AV_LOG_ERROR, "invalid header type (%d)\n", header.header_type);
346 return -1;
347 } else if ((header.header_type == 2) || (header.header_type == 3)) {
348 s->flags = header.flags;
349 if (!(s->flags & FLAG_INTERFRAME))
350 s->flags |= FLAG_KEYFRAME;
351 } else
352 s->flags = FLAG_KEYFRAME;
353 } else /* Version 1 */
354 s->flags = FLAG_KEYFRAME;
355
356 if (s->flags & FLAG_SPRITE) {
357 av_log_ask_for_sample(s->avctx, "SPRITE frame found.\n");
358 /* FIXME header.width, height, xoffset and yoffset aren't initialized */
359 return -1;
360 } else {
361 s->w = header.xsize;
362 s->h = header.ysize;
363 if (header.header_type < 2) {
364 if ((s->w < 213) && (s->h >= 176))
365 {
366 s->flags |= FLAG_INTERPOLATED;
367 av_log_ask_for_sample(s->avctx, "INTERPOLATION selected.\n");
368 }
369 }
370 }
371
372 if (header.compression >= 17) {
373 av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression);
374 return -1;
375 }
376
377 if ((header.deltaset != s->last_deltaset) ||
378 (header.vectable != s->last_vectable))
379 select_delta_tables(s, header.deltaset);
380
381 if ((header.compression & 1) && header.header_type)
382 sel_vector_table = pc_tbl2;
383 else {
384 if (header.vectable > 0 && header.vectable < 4)
385 sel_vector_table = tables[header.vectable - 1];
386 else {
387 av_log(s->avctx, AV_LOG_ERROR, "invalid vector table id (%d)\n", header.vectable);
388 return -1;
389 }
390 }
391
392 if (compression_types[header.compression].algorithm == ALGO_RGB24H) {
393 new_pix_fmt = AV_PIX_FMT_RGB32;
394 width_shift = 1;
395 } else
396 new_pix_fmt = AV_PIX_FMT_RGB555; // RGB565 is supported as well
397
398 s->w >>= width_shift;
399 if (av_image_check_size(s->w, s->h, 0, s->avctx) < 0)
400 return -1;
401
402 if (s->w != s->avctx->width || s->h != s->avctx->height ||
403 new_pix_fmt != s->avctx->pix_fmt) {
404 if (s->frame.data[0])
405 s->avctx->release_buffer(s->avctx, &s->frame);
406 s->avctx->sample_aspect_ratio = (AVRational){ 1 << width_shift, 1 };
407 s->avctx->pix_fmt = new_pix_fmt;
408 avcodec_set_dimensions(s->avctx, s->w, s->h);
409 av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
410 }
411
412 /* There is 1 change bit per 4 pixels, so each change byte represents
413 * 32 pixels; divide width by 4 to obtain the number of change bits and
414 * then round up to the nearest byte. */
415 s->mb_change_bits_row_size = ((s->avctx->width >> (2 - width_shift)) + 7) >> 3;
416
417 if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable))
418 {
419 if (compression_types[header.compression].algorithm == ALGO_RGB24H)
420 gen_vector_table24(s, sel_vector_table);
421 else
422 if (s->avctx->pix_fmt == AV_PIX_FMT_RGB555)
423 gen_vector_table15(s, sel_vector_table);
424 else
425 gen_vector_table16(s, sel_vector_table);
426 }
427
428 /* set up pointers to the other key data chunks */
429 s->mb_change_bits = s->buf + header.header_size;
430 if (s->flags & FLAG_KEYFRAME) {
431 /* no change bits specified for a keyframe; only index bytes */
432 s->index_stream = s->mb_change_bits;
433 } else {
434 /* one change bit per 4x4 block */
435 s->index_stream = s->mb_change_bits +
436 (s->mb_change_bits_row_size * (s->avctx->height >> 2));
437 }
438 s->index_stream_size = s->size - (s->index_stream - s->buf);
439
440 s->last_deltaset = header.deltaset;
441 s->last_vectable = header.vectable;
442 s->compression = header.compression;
443 s->block_width = compression_types[header.compression].block_width;
444 s->block_height = compression_types[header.compression].block_height;
445 s->block_type = compression_types[header.compression].block_type;
446
447 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
448 av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n",
449 s->last_deltaset, s->last_vectable, s->compression, s->block_width,
450 s->block_height, s->block_type,
451 s->flags & FLAG_KEYFRAME ? " KEY" : "",
452 s->flags & FLAG_INTERFRAME ? " INTER" : "",
453 s->flags & FLAG_SPRITE ? " SPRITE" : "",
454 s->flags & FLAG_INTERPOLATED ? " INTERPOL" : "");
455
456 return header.header_size;
457 }
458
459 static av_cold int truemotion1_decode_init(AVCodecContext *avctx)
460 {
461 TrueMotion1Context *s = avctx->priv_data;
462
463 s->avctx = avctx;
464
465 // FIXME: it may change ?
466 // if (avctx->bits_per_sample == 24)
467 // avctx->pix_fmt = AV_PIX_FMT_RGB24;
468 // else
469 // avctx->pix_fmt = AV_PIX_FMT_RGB555;
470
471 s->frame.data[0] = NULL;
472
473 /* there is a vertical predictor for each pixel in a line; each vertical
474 * predictor is 0 to start with */
475 av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
476
477 return 0;
478 }
479
480 /*
481 Block decoding order:
482
483 dxi: Y-Y
484 dxic: Y-C-Y
485 dxic2: Y-C-Y-C
486
487 hres,vres,i,i%vres (0 < i < 4)
488 2x2 0: 0 dxic2
489 2x2 1: 1 dxi
490 2x2 2: 0 dxic2
491 2x2 3: 1 dxi
492 2x4 0: 0 dxic2
493 2x4 1: 1 dxi
494 2x4 2: 2 dxi
495 2x4 3: 3 dxi
496 4x2 0: 0 dxic
497 4x2 1: 1 dxi
498 4x2 2: 0 dxic
499 4x2 3: 1 dxi
500 4x4 0: 0 dxic
501 4x4 1: 1 dxi
502 4x4 2: 2 dxi
503 4x4 3: 3 dxi
504 */
505
506 #define GET_NEXT_INDEX() \
507 {\
508 if (index_stream_index >= s->index_stream_size) { \
509 av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \
510 return; \
511 } \
512 index = s->index_stream[index_stream_index++] * 4; \
513 }
514
515 #define APPLY_C_PREDICTOR() \
516 predictor_pair = s->c_predictor_table[index]; \
517 horiz_pred += (predictor_pair >> 1); \
518 if (predictor_pair & 1) { \
519 GET_NEXT_INDEX() \
520 if (!index) { \
521 GET_NEXT_INDEX() \
522 predictor_pair = s->c_predictor_table[index]; \
523 horiz_pred += ((predictor_pair >> 1) * 5); \
524 if (predictor_pair & 1) \
525 GET_NEXT_INDEX() \
526 else \
527 index++; \
528 } \
529 } else \
530 index++;
531
532 #define APPLY_C_PREDICTOR_24() \
533 predictor_pair = s->c_predictor_table[index]; \
534 horiz_pred += (predictor_pair >> 1); \
535 if (predictor_pair & 1) { \
536 GET_NEXT_INDEX() \
537 if (!index) { \
538 GET_NEXT_INDEX() \
539 predictor_pair = s->fat_c_predictor_table[index]; \
540 horiz_pred += (predictor_pair >> 1); \
541 if (predictor_pair & 1) \
542 GET_NEXT_INDEX() \
543 else \
544 index++; \
545 } \
546 } else \
547 index++;
548
549
550 #define APPLY_Y_PREDICTOR() \
551 predictor_pair = s->y_predictor_table[index]; \
552 horiz_pred += (predictor_pair >> 1); \
553 if (predictor_pair & 1) { \
554 GET_NEXT_INDEX() \
555 if (!index) { \
556 GET_NEXT_INDEX() \
557 predictor_pair = s->y_predictor_table[index]; \
558 horiz_pred += ((predictor_pair >> 1) * 5); \
559 if (predictor_pair & 1) \
560 GET_NEXT_INDEX() \
561 else \
562 index++; \
563 } \
564 } else \
565 index++;
566
567 #define APPLY_Y_PREDICTOR_24() \
568 predictor_pair = s->y_predictor_table[index]; \
569 horiz_pred += (predictor_pair >> 1); \
570 if (predictor_pair & 1) { \
571 GET_NEXT_INDEX() \
572 if (!index) { \
573 GET_NEXT_INDEX() \
574 predictor_pair = s->fat_y_predictor_table[index]; \
575 horiz_pred += (predictor_pair >> 1); \
576 if (predictor_pair & 1) \
577 GET_NEXT_INDEX() \
578 else \
579 index++; \
580 } \
581 } else \
582 index++;
583
584 #define OUTPUT_PIXEL_PAIR() \
585 *current_pixel_pair = *vert_pred + horiz_pred; \
586 *vert_pred++ = *current_pixel_pair++;
587
588 static void truemotion1_decode_16bit(TrueMotion1Context *s)
589 {
590 int y;
591 int pixels_left; /* remaining pixels on this line */
592 unsigned int predictor_pair;
593 unsigned int horiz_pred;
594 unsigned int *vert_pred;
595 unsigned int *current_pixel_pair;
596 unsigned char *current_line = s->frame.data[0];
597 int keyframe = s->flags & FLAG_KEYFRAME;
598
599 /* these variables are for managing the stream of macroblock change bits */
600 const unsigned char *mb_change_bits = s->mb_change_bits;
601 unsigned char mb_change_byte;
602 unsigned char mb_change_byte_mask;
603 int mb_change_index;
604
605 /* these variables are for managing the main index stream */
606 int index_stream_index = 0; /* yes, the index into the index stream */
607 int index;
608
609 /* clean out the line buffer */
610 memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
611
612 GET_NEXT_INDEX();
613
614 for (y = 0; y < s->avctx->height; y++) {
615
616 /* re-init variables for the next line iteration */
617 horiz_pred = 0;
618 current_pixel_pair = (unsigned int *)current_line;
619 vert_pred = s->vert_pred;
620 mb_change_index = 0;
621 mb_change_byte = mb_change_bits[mb_change_index++];
622 mb_change_byte_mask = 0x01;
623 pixels_left = s->avctx->width;
624
625 while (pixels_left > 0) {
626
627 if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
628
629 switch (y & 3) {
630 case 0:
631 /* if macroblock width is 2, apply C-Y-C-Y; else
632 * apply C-Y-Y */
633 if (s->block_width == 2) {
634 APPLY_C_PREDICTOR();
635 APPLY_Y_PREDICTOR();
636 OUTPUT_PIXEL_PAIR();
637 APPLY_C_PREDICTOR();
638 APPLY_Y_PREDICTOR();
639 OUTPUT_PIXEL_PAIR();
640 } else {
641 APPLY_C_PREDICTOR();
642 APPLY_Y_PREDICTOR();
643 OUTPUT_PIXEL_PAIR();
644 APPLY_Y_PREDICTOR();
645 OUTPUT_PIXEL_PAIR();
646 }
647 break;
648
649 case 1:
650 case 3:
651 /* always apply 2 Y predictors on these iterations */
652 APPLY_Y_PREDICTOR();
653 OUTPUT_PIXEL_PAIR();
654 APPLY_Y_PREDICTOR();
655 OUTPUT_PIXEL_PAIR();
656 break;
657
658 case 2:
659 /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
660 * depending on the macroblock type */
661 if (s->block_type == BLOCK_2x2) {
662 APPLY_C_PREDICTOR();
663 APPLY_Y_PREDICTOR();
664 OUTPUT_PIXEL_PAIR();
665 APPLY_C_PREDICTOR();
666 APPLY_Y_PREDICTOR();
667 OUTPUT_PIXEL_PAIR();
668 } else if (s->block_type == BLOCK_4x2) {
669 APPLY_C_PREDICTOR();
670 APPLY_Y_PREDICTOR();
671 OUTPUT_PIXEL_PAIR();
672 APPLY_Y_PREDICTOR();
673 OUTPUT_PIXEL_PAIR();
674 } else {
675 APPLY_Y_PREDICTOR();
676 OUTPUT_PIXEL_PAIR();
677 APPLY_Y_PREDICTOR();
678 OUTPUT_PIXEL_PAIR();
679 }
680 break;
681 }
682
683 } else {
684
685 /* skip (copy) four pixels, but reassign the horizontal
686 * predictor */
687 *vert_pred++ = *current_pixel_pair++;
688 horiz_pred = *current_pixel_pair - *vert_pred;
689 *vert_pred++ = *current_pixel_pair++;
690
691 }
692
693 if (!keyframe) {
694 mb_change_byte_mask <<= 1;
695
696 /* next byte */
697 if (!mb_change_byte_mask) {
698 mb_change_byte = mb_change_bits[mb_change_index++];
699 mb_change_byte_mask = 0x01;
700 }
701 }
702
703 pixels_left -= 4;
704 }
705
706 /* next change row */
707 if (((y + 1) & 3) == 0)
708 mb_change_bits += s->mb_change_bits_row_size;
709
710 current_line += s->frame.linesize[0];
711 }
712 }
713
714 static void truemotion1_decode_24bit(TrueMotion1Context *s)
715 {
716 int y;
717 int pixels_left; /* remaining pixels on this line */
718 unsigned int predictor_pair;
719 unsigned int horiz_pred;
720 unsigned int *vert_pred;
721 unsigned int *current_pixel_pair;
722 unsigned char *current_line = s->frame.data[0];
723 int keyframe = s->flags & FLAG_KEYFRAME;
724
725 /* these variables are for managing the stream of macroblock change bits */
726 const unsigned char *mb_change_bits = s->mb_change_bits;
727 unsigned char mb_change_byte;
728 unsigned char mb_change_byte_mask;
729 int mb_change_index;
730
731 /* these variables are for managing the main index stream */
732 int index_stream_index = 0; /* yes, the index into the index stream */
733 int index;
734
735 /* clean out the line buffer */
736 memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
737
738 GET_NEXT_INDEX();
739
740 for (y = 0; y < s->avctx->height; y++) {
741
742 /* re-init variables for the next line iteration */
743 horiz_pred = 0;
744 current_pixel_pair = (unsigned int *)current_line;
745 vert_pred = s->vert_pred;
746 mb_change_index = 0;
747 mb_change_byte = mb_change_bits[mb_change_index++];
748 mb_change_byte_mask = 0x01;
749 pixels_left = s->avctx->width;
750
751 while (pixels_left > 0) {
752
753 if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
754
755 switch (y & 3) {
756 case 0:
757 /* if macroblock width is 2, apply C-Y-C-Y; else
758 * apply C-Y-Y */
759 if (s->block_width == 2) {
760 APPLY_C_PREDICTOR_24();
761 APPLY_Y_PREDICTOR_24();
762 OUTPUT_PIXEL_PAIR();
763 APPLY_C_PREDICTOR_24();
764 APPLY_Y_PREDICTOR_24();
765 OUTPUT_PIXEL_PAIR();
766 } else {
767 APPLY_C_PREDICTOR_24();
768 APPLY_Y_PREDICTOR_24();
769 OUTPUT_PIXEL_PAIR();
770 APPLY_Y_PREDICTOR_24();
771 OUTPUT_PIXEL_PAIR();
772 }
773 break;
774
775 case 1:
776 case 3:
777 /* always apply 2 Y predictors on these iterations */
778 APPLY_Y_PREDICTOR_24();
779 OUTPUT_PIXEL_PAIR();
780 APPLY_Y_PREDICTOR_24();
781 OUTPUT_PIXEL_PAIR();
782 break;
783
784 case 2:
785 /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
786 * depending on the macroblock type */
787 if (s->block_type == BLOCK_2x2) {
788 APPLY_C_PREDICTOR_24();
789 APPLY_Y_PREDICTOR_24();
790 OUTPUT_PIXEL_PAIR();
791 APPLY_C_PREDICTOR_24();
792 APPLY_Y_PREDICTOR_24();
793 OUTPUT_PIXEL_PAIR();
794 } else if (s->block_type == BLOCK_4x2) {
795 APPLY_C_PREDICTOR_24();
796 APPLY_Y_PREDICTOR_24();
797 OUTPUT_PIXEL_PAIR();
798 APPLY_Y_PREDICTOR_24();
799 OUTPUT_PIXEL_PAIR();
800 } else {
801 APPLY_Y_PREDICTOR_24();
802 OUTPUT_PIXEL_PAIR();
803 APPLY_Y_PREDICTOR_24();
804 OUTPUT_PIXEL_PAIR();
805 }
806 break;
807 }
808
809 } else {
810
811 /* skip (copy) four pixels, but reassign the horizontal
812 * predictor */
813 *vert_pred++ = *current_pixel_pair++;
814 horiz_pred = *current_pixel_pair - *vert_pred;
815 *vert_pred++ = *current_pixel_pair++;
816
817 }
818
819 if (!keyframe) {
820 mb_change_byte_mask <<= 1;
821
822 /* next byte */
823 if (!mb_change_byte_mask) {
824 mb_change_byte = mb_change_bits[mb_change_index++];
825 mb_change_byte_mask = 0x01;
826 }
827 }
828
829 pixels_left -= 2;
830 }
831
832 /* next change row */
833 if (((y + 1) & 3) == 0)
834 mb_change_bits += s->mb_change_bits_row_size;
835
836 current_line += s->frame.linesize[0];
837 }
838 }
839
840
841 static int truemotion1_decode_frame(AVCodecContext *avctx,
842 void *data, int *data_size,
843 AVPacket *avpkt)
844 {
845 const uint8_t *buf = avpkt->data;
846 int buf_size = avpkt->size;
847 TrueMotion1Context *s = avctx->priv_data;
848
849 s->buf = buf;
850 s->size = buf_size;
851
852 if (truemotion1_decode_header(s) == -1)
853 return -1;
854
855 s->frame.reference = 1;
856 s->frame.buffer_hints = FF_BUFFER_HINTS_VALID |
857 FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
858 if (avctx->reget_buffer(avctx, &s->frame) < 0) {
859 av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
860 return -1;
861 }
862
863 if (compression_types[s->compression].algorithm == ALGO_RGB24H) {
864 truemotion1_decode_24bit(s);
865 } else if (compression_types[s->compression].algorithm != ALGO_NOP) {
866 truemotion1_decode_16bit(s);
867 }
868
869 *data_size = sizeof(AVFrame);
870 *(AVFrame*)data = s->frame;
871
872 /* report that the buffer was completely consumed */
873 return buf_size;
874 }
875
876 static av_cold int truemotion1_decode_end(AVCodecContext *avctx)
877 {
878 TrueMotion1Context *s = avctx->priv_data;
879
880 if (s->frame.data[0])
881 avctx->release_buffer(avctx, &s->frame);
882
883 av_free(s->vert_pred);
884
885 return 0;
886 }
887
888 AVCodec ff_truemotion1_decoder = {
889 .name = "truemotion1",
890 .type = AVMEDIA_TYPE_VIDEO,
891 .id = AV_CODEC_ID_TRUEMOTION1,
892 .priv_data_size = sizeof(TrueMotion1Context),
893 .init = truemotion1_decode_init,
894 .close = truemotion1_decode_end,
895 .decode = truemotion1_decode_frame,
896 .capabilities = CODEC_CAP_DR1,
897 .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 1.0"),
898 };