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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
45typedef 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
87struct 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
116typedef 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 */
124static 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
148static 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
172static int make_ydt15_entry(int p2, int p1, int16_t *ydt)
173#else
174static 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 << 5) + (lo << 10);
181 hi = ydt[p2];
182 hi += (hi << 5) + (hi << 10);
183 return (lo + (hi << 16)) << 1;
184}
185
186static 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] << 10;
192 lo = b + r;
193 return (lo + (lo << 16)) << 1;
194}
195
196#if HAVE_BIGENDIAN
197static int make_ydt16_entry(int p2, int p1, int16_t *ydt)
198#else
199static 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
211static 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
221static 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
230static 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
239static 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
260static 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
281static 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 */
310static 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 } else {
448 /* one change bit per 4x4 block */
449 s->index_stream = s->mb_change_bits +
450 (s->mb_change_bits_row_size * (s->avctx->height >> 2));
451 }
452 s->index_stream_size = s->size - (s->index_stream - s->buf);
453
454 s->last_deltaset = header.deltaset;
455 s->last_vectable = header.vectable;
456 s->compression = header.compression;
457 s->block_width = compression_types[header.compression].block_width;
458 s->block_height = compression_types[header.compression].block_height;
459 s->block_type = compression_types[header.compression].block_type;
460
461 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
462 av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n",
463 s->last_deltaset, s->last_vectable, s->compression, s->block_width,
464 s->block_height, s->block_type,
465 s->flags & FLAG_KEYFRAME ? " KEY" : "",
466 s->flags & FLAG_INTERFRAME ? " INTER" : "",
467 s->flags & FLAG_SPRITE ? " SPRITE" : "",
468 s->flags & FLAG_INTERPOLATED ? " INTERPOL" : "");
469
470 return header.header_size;
471}
472
473static av_cold int truemotion1_decode_init(AVCodecContext *avctx)
474{
475 TrueMotion1Context *s = avctx->priv_data;
476
477 s->avctx = avctx;
478
479 // FIXME: it may change ?
480// if (avctx->bits_per_sample == 24)
481// avctx->pix_fmt = AV_PIX_FMT_RGB24;
482// else
483// avctx->pix_fmt = AV_PIX_FMT_RGB555;
484
485 s->frame = av_frame_alloc();
486 if (!s->frame)
487 return AVERROR(ENOMEM);
488
489 /* there is a vertical predictor for each pixel in a line; each vertical
490 * predictor is 0 to start with */
491 av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
492 if (!s->vert_pred) {
493 av_frame_free(&s->frame);
494 return AVERROR(ENOMEM);
495 }
496
497 return 0;
498}
499
500/*
501Block decoding order:
502
503dxi: Y-Y
504dxic: Y-C-Y
505dxic2: Y-C-Y-C
506
507hres,vres,i,i%vres (0 < i < 4)
5082x2 0: 0 dxic2
5092x2 1: 1 dxi
5102x2 2: 0 dxic2
5112x2 3: 1 dxi
5122x4 0: 0 dxic2
5132x4 1: 1 dxi
5142x4 2: 2 dxi
5152x4 3: 3 dxi
5164x2 0: 0 dxic
5174x2 1: 1 dxi
5184x2 2: 0 dxic
5194x2 3: 1 dxi
5204x4 0: 0 dxic
5214x4 1: 1 dxi
5224x4 2: 2 dxi
5234x4 3: 3 dxi
524*/
525
526#define GET_NEXT_INDEX() \
527{\
528 if (index_stream_index >= s->index_stream_size) { \
529 av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \
530 return; \
531 } \
532 index = s->index_stream[index_stream_index++] * 4; \
533}
534
535#define INC_INDEX \
536do { \
537 if (index >= 1023) { \
538 av_log(s->avctx, AV_LOG_ERROR, "Invalid index value.\n"); \
539 return; \
540 } \
541 index++; \
542} while (0)
543
544#define APPLY_C_PREDICTOR() \
545 predictor_pair = s->c_predictor_table[index]; \
546 horiz_pred += (predictor_pair >> 1); \
547 if (predictor_pair & 1) { \
548 GET_NEXT_INDEX() \
549 if (!index) { \
550 GET_NEXT_INDEX() \
551 predictor_pair = s->c_predictor_table[index]; \
552 horiz_pred += ((predictor_pair >> 1) * 5); \
553 if (predictor_pair & 1) \
554 GET_NEXT_INDEX() \
555 else \
556 INC_INDEX; \
557 } \
558 } else \
559 INC_INDEX;
560
561#define APPLY_C_PREDICTOR_24() \
562 predictor_pair = s->c_predictor_table[index]; \
563 horiz_pred += (predictor_pair >> 1); \
564 if (predictor_pair & 1) { \
565 GET_NEXT_INDEX() \
566 if (!index) { \
567 GET_NEXT_INDEX() \
568 predictor_pair = s->fat_c_predictor_table[index]; \
569 horiz_pred += (predictor_pair >> 1); \
570 if (predictor_pair & 1) \
571 GET_NEXT_INDEX() \
572 else \
573 INC_INDEX; \
574 } \
575 } else \
576 INC_INDEX;
577
578
579#define APPLY_Y_PREDICTOR() \
580 predictor_pair = s->y_predictor_table[index]; \
581 horiz_pred += (predictor_pair >> 1); \
582 if (predictor_pair & 1) { \
583 GET_NEXT_INDEX() \
584 if (!index) { \
585 GET_NEXT_INDEX() \
586 predictor_pair = s->y_predictor_table[index]; \
587 horiz_pred += ((predictor_pair >> 1) * 5); \
588 if (predictor_pair & 1) \
589 GET_NEXT_INDEX() \
590 else \
591 INC_INDEX; \
592 } \
593 } else \
594 INC_INDEX;
595
596#define APPLY_Y_PREDICTOR_24() \
597 predictor_pair = s->y_predictor_table[index]; \
598 horiz_pred += (predictor_pair >> 1); \
599 if (predictor_pair & 1) { \
600 GET_NEXT_INDEX() \
601 if (!index) { \
602 GET_NEXT_INDEX() \
603 predictor_pair = s->fat_y_predictor_table[index]; \
604 horiz_pred += (predictor_pair >> 1); \
605 if (predictor_pair & 1) \
606 GET_NEXT_INDEX() \
607 else \
608 INC_INDEX; \
609 } \
610 } else \
611 INC_INDEX;
612
613#define OUTPUT_PIXEL_PAIR() \
614 *current_pixel_pair = *vert_pred + horiz_pred; \
615 *vert_pred++ = *current_pixel_pair++;
616
617static void truemotion1_decode_16bit(TrueMotion1Context *s)
618{
619 int y;
620 int pixels_left; /* remaining pixels on this line */
621 unsigned int predictor_pair;
622 unsigned int horiz_pred;
623 unsigned int *vert_pred;
624 unsigned int *current_pixel_pair;
625 unsigned char *current_line = s->frame->data[0];
626 int keyframe = s->flags & FLAG_KEYFRAME;
627
628 /* these variables are for managing the stream of macroblock change bits */
629 const unsigned char *mb_change_bits = s->mb_change_bits;
630 unsigned char mb_change_byte;
631 unsigned char mb_change_byte_mask;
632 int mb_change_index;
633
634 /* these variables are for managing the main index stream */
635 int index_stream_index = 0; /* yes, the index into the index stream */
636 int index;
637
638 /* clean out the line buffer */
639 memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
640
641 GET_NEXT_INDEX();
642
643 for (y = 0; y < s->avctx->height; y++) {
644
645 /* re-init variables for the next line iteration */
646 horiz_pred = 0;
647 current_pixel_pair = (unsigned int *)current_line;
648 vert_pred = s->vert_pred;
649 mb_change_index = 0;
650 if (!keyframe)
651 mb_change_byte = mb_change_bits[mb_change_index++];
652 mb_change_byte_mask = 0x01;
653 pixels_left = s->avctx->width;
654
655 while (pixels_left > 0) {
656
657 if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
658
659 switch (y & 3) {
660 case 0:
661 /* if macroblock width is 2, apply C-Y-C-Y; else
662 * apply C-Y-Y */
663 if (s->block_width == 2) {
664 APPLY_C_PREDICTOR();
665 APPLY_Y_PREDICTOR();
666 OUTPUT_PIXEL_PAIR();
667 APPLY_C_PREDICTOR();
668 APPLY_Y_PREDICTOR();
669 OUTPUT_PIXEL_PAIR();
670 } else {
671 APPLY_C_PREDICTOR();
672 APPLY_Y_PREDICTOR();
673 OUTPUT_PIXEL_PAIR();
674 APPLY_Y_PREDICTOR();
675 OUTPUT_PIXEL_PAIR();
676 }
677 break;
678
679 case 1:
680 case 3:
681 /* always apply 2 Y predictors on these iterations */
682 APPLY_Y_PREDICTOR();
683 OUTPUT_PIXEL_PAIR();
684 APPLY_Y_PREDICTOR();
685 OUTPUT_PIXEL_PAIR();
686 break;
687
688 case 2:
689 /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
690 * depending on the macroblock type */
691 if (s->block_type == BLOCK_2x2) {
692 APPLY_C_PREDICTOR();
693 APPLY_Y_PREDICTOR();
694 OUTPUT_PIXEL_PAIR();
695 APPLY_C_PREDICTOR();
696 APPLY_Y_PREDICTOR();
697 OUTPUT_PIXEL_PAIR();
698 } else if (s->block_type == BLOCK_4x2) {
699 APPLY_C_PREDICTOR();
700 APPLY_Y_PREDICTOR();
701 OUTPUT_PIXEL_PAIR();
702 APPLY_Y_PREDICTOR();
703 OUTPUT_PIXEL_PAIR();
704 } else {
705 APPLY_Y_PREDICTOR();
706 OUTPUT_PIXEL_PAIR();
707 APPLY_Y_PREDICTOR();
708 OUTPUT_PIXEL_PAIR();
709 }
710 break;
711 }
712
713 } else {
714
715 /* skip (copy) four pixels, but reassign the horizontal
716 * predictor */
717 *vert_pred++ = *current_pixel_pair++;
718 horiz_pred = *current_pixel_pair - *vert_pred;
719 *vert_pred++ = *current_pixel_pair++;
720
721 }
722
723 if (!keyframe) {
724 mb_change_byte_mask <<= 1;
725
726 /* next byte */
727 if (!mb_change_byte_mask) {
728 mb_change_byte = mb_change_bits[mb_change_index++];
729 mb_change_byte_mask = 0x01;
730 }
731 }
732
733 pixels_left -= 4;
734 }
735
736 /* next change row */
737 if (((y + 1) & 3) == 0)
738 mb_change_bits += s->mb_change_bits_row_size;
739
740 current_line += s->frame->linesize[0];
741 }
742}
743
744static void truemotion1_decode_24bit(TrueMotion1Context *s)
745{
746 int y;
747 int pixels_left; /* remaining pixels on this line */
748 unsigned int predictor_pair;
749 unsigned int horiz_pred;
750 unsigned int *vert_pred;
751 unsigned int *current_pixel_pair;
752 unsigned char *current_line = s->frame->data[0];
753 int keyframe = s->flags & FLAG_KEYFRAME;
754
755 /* these variables are for managing the stream of macroblock change bits */
756 const unsigned char *mb_change_bits = s->mb_change_bits;
757 unsigned char mb_change_byte;
758 unsigned char mb_change_byte_mask;
759 int mb_change_index;
760
761 /* these variables are for managing the main index stream */
762 int index_stream_index = 0; /* yes, the index into the index stream */
763 int index;
764
765 /* clean out the line buffer */
766 memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
767
768 GET_NEXT_INDEX();
769
770 for (y = 0; y < s->avctx->height; y++) {
771
772 /* re-init variables for the next line iteration */
773 horiz_pred = 0;
774 current_pixel_pair = (unsigned int *)current_line;
775 vert_pred = s->vert_pred;
776 mb_change_index = 0;
777 mb_change_byte = mb_change_bits[mb_change_index++];
778 mb_change_byte_mask = 0x01;
779 pixels_left = s->avctx->width;
780
781 while (pixels_left > 0) {
782
783 if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
784
785 switch (y & 3) {
786 case 0:
787 /* if macroblock width is 2, apply C-Y-C-Y; else
788 * apply C-Y-Y */
789 if (s->block_width == 2) {
790 APPLY_C_PREDICTOR_24();
791 APPLY_Y_PREDICTOR_24();
792 OUTPUT_PIXEL_PAIR();
793 APPLY_C_PREDICTOR_24();
794 APPLY_Y_PREDICTOR_24();
795 OUTPUT_PIXEL_PAIR();
796 } else {
797 APPLY_C_PREDICTOR_24();
798 APPLY_Y_PREDICTOR_24();
799 OUTPUT_PIXEL_PAIR();
800 APPLY_Y_PREDICTOR_24();
801 OUTPUT_PIXEL_PAIR();
802 }
803 break;
804
805 case 1:
806 case 3:
807 /* always apply 2 Y predictors on these iterations */
808 APPLY_Y_PREDICTOR_24();
809 OUTPUT_PIXEL_PAIR();
810 APPLY_Y_PREDICTOR_24();
811 OUTPUT_PIXEL_PAIR();
812 break;
813
814 case 2:
815 /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
816 * depending on the macroblock type */
817 if (s->block_type == BLOCK_2x2) {
818 APPLY_C_PREDICTOR_24();
819 APPLY_Y_PREDICTOR_24();
820 OUTPUT_PIXEL_PAIR();
821 APPLY_C_PREDICTOR_24();
822 APPLY_Y_PREDICTOR_24();
823 OUTPUT_PIXEL_PAIR();
824 } else if (s->block_type == BLOCK_4x2) {
825 APPLY_C_PREDICTOR_24();
826 APPLY_Y_PREDICTOR_24();
827 OUTPUT_PIXEL_PAIR();
828 APPLY_Y_PREDICTOR_24();
829 OUTPUT_PIXEL_PAIR();
830 } else {
831 APPLY_Y_PREDICTOR_24();
832 OUTPUT_PIXEL_PAIR();
833 APPLY_Y_PREDICTOR_24();
834 OUTPUT_PIXEL_PAIR();
835 }
836 break;
837 }
838
839 } else {
840
841 /* skip (copy) four pixels, but reassign the horizontal
842 * predictor */
843 *vert_pred++ = *current_pixel_pair++;
844 horiz_pred = *current_pixel_pair - *vert_pred;
845 *vert_pred++ = *current_pixel_pair++;
846
847 }
848
849 if (!keyframe) {
850 mb_change_byte_mask <<= 1;
851
852 /* next byte */
853 if (!mb_change_byte_mask) {
854 mb_change_byte = mb_change_bits[mb_change_index++];
855 mb_change_byte_mask = 0x01;
856 }
857 }
858
859 pixels_left -= 2;
860 }
861
862 /* next change row */
863 if (((y + 1) & 3) == 0)
864 mb_change_bits += s->mb_change_bits_row_size;
865
866 current_line += s->frame->linesize[0];
867 }
868}
869
870
871static int truemotion1_decode_frame(AVCodecContext *avctx,
872 void *data, int *got_frame,
873 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)
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(data, 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
903static 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
913AVCodec ff_truemotion1_decoder = {
914 .name = "truemotion1",
915 .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 1.0"),
916 .type = AVMEDIA_TYPE_VIDEO,
917 .id = AV_CODEC_ID_TRUEMOTION1,
918 .priv_data_size = sizeof(TrueMotion1Context),
919 .init = truemotion1_decode_init,
920 .close = truemotion1_decode_end,
921 .decode = truemotion1_decode_frame,
922 .capabilities = AV_CODEC_CAP_DR1,
923};
924
generated by cgit at 2024-05-17 01:47:47 (GMT)