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Imported Debian version 2.4.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / truemotion1.c
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2ba45a60
DM		 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 << 16)) << 1;
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 << 8) + (hi << 16)) << 1;
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]<<16;
236 return (b+r) << 1;
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_RGB32;
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
406 if (s->w != s->avctx->width || s->h != s->avctx->height ||
407 new_pix_fmt != s->avctx->pix_fmt) {
408 av_frame_unref(s->frame);
409 s->avctx->sample_aspect_ratio = (AVRational){ 1 << width_shift, 1 };
410 s->avctx->pix_fmt = new_pix_fmt;
411
412 if ((ret = ff_set_dimensions(s->avctx, s->w, s->h)) < 0)
413 return ret;
414
415 ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
416
417 av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
418 if (!s->vert_pred)
419 return AVERROR(ENOMEM);
420 }
421
422 /* There is 1 change bit per 4 pixels, so each change byte represents
423 * 32 pixels; divide width by 4 to obtain the number of change bits and
424 * then round up to the nearest byte. */
425 s->mb_change_bits_row_size = ((s->avctx->width >> (2 - width_shift)) + 7) >> 3;
426
427 if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable))
428 {
429 if (compression_types[header.compression].algorithm == ALGO_RGB24H)
430 gen_vector_table24(s, sel_vector_table);
431 else
432 if (s->avctx->pix_fmt == AV_PIX_FMT_RGB555)
433 gen_vector_table15(s, sel_vector_table);
434 else
435 gen_vector_table16(s, sel_vector_table);
436 }
437
438 /* set up pointers to the other key data chunks */
439 s->mb_change_bits = s->buf + header.header_size;
440 if (s->flags & FLAG_KEYFRAME) {
441 /* no change bits specified for a keyframe; only index bytes */
442 s->index_stream = s->mb_change_bits;
443 } else {
444 /* one change bit per 4x4 block */
445 s->index_stream = s->mb_change_bits +
446 (s->mb_change_bits_row_size * (s->avctx->height >> 2));
447 }
448 s->index_stream_size = s->size - (s->index_stream - s->buf);
449
450 s->last_deltaset = header.deltaset;
451 s->last_vectable = header.vectable;
452 s->compression = header.compression;
453 s->block_width = compression_types[header.compression].block_width;
454 s->block_height = compression_types[header.compression].block_height;
455 s->block_type = compression_types[header.compression].block_type;
456
457 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
458 av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n",
459 s->last_deltaset, s->last_vectable, s->compression, s->block_width,
460 s->block_height, s->block_type,
461 s->flags & FLAG_KEYFRAME ? " KEY" : "",
462 s->flags & FLAG_INTERFRAME ? " INTER" : "",
463 s->flags & FLAG_SPRITE ? " SPRITE" : "",
464 s->flags & FLAG_INTERPOLATED ? " INTERPOL" : "");
465
466 return header.header_size;
467}
468
469static av_cold int truemotion1_decode_init(AVCodecContext *avctx)
470{
471 TrueMotion1Context *s = avctx->priv_data;
472
473 s->avctx = avctx;
474
475 // FIXME: it may change ?
476// if (avctx->bits_per_sample == 24)
477// avctx->pix_fmt = AV_PIX_FMT_RGB24;
478// else
479// avctx->pix_fmt = AV_PIX_FMT_RGB555;
480
481 s->frame = av_frame_alloc();
482 if (!s->frame)
483 return AVERROR(ENOMEM);
484
485 /* there is a vertical predictor for each pixel in a line; each vertical
486 * predictor is 0 to start with */
487 av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
488 if (!s->vert_pred)
489 return AVERROR(ENOMEM);
490
491 return 0;
492}
493
494/*
495Block decoding order:
496
497dxi: Y-Y
498dxic: Y-C-Y
499dxic2: Y-C-Y-C
500
501hres,vres,i,i%vres (0 < i < 4)
5022x2 0: 0 dxic2
5032x2 1: 1 dxi
5042x2 2: 0 dxic2
5052x2 3: 1 dxi
5062x4 0: 0 dxic2
5072x4 1: 1 dxi
5082x4 2: 2 dxi
5092x4 3: 3 dxi
5104x2 0: 0 dxic
5114x2 1: 1 dxi
5124x2 2: 0 dxic
5134x2 3: 1 dxi
5144x4 0: 0 dxic
5154x4 1: 1 dxi
5164x4 2: 2 dxi
5174x4 3: 3 dxi
518*/
519
520#define GET_NEXT_INDEX() \
521{\
522 if (index_stream_index >= s->index_stream_size) { \
523 av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \
524 return; \
525 } \
526 index = s->index_stream[index_stream_index++] * 4; \
527}
528
529#define INC_INDEX \
530do { \
531 if (index >= 1023) { \
532 av_log(s->avctx, AV_LOG_ERROR, "Invalid index value.\n"); \
533 return; \
534 } \
535 index++; \
536} while (0)
537
538#define APPLY_C_PREDICTOR() \
539 predictor_pair = s->c_predictor_table[index]; \
540 horiz_pred += (predictor_pair >> 1); \
541 if (predictor_pair & 1) { \
542 GET_NEXT_INDEX() \
543 if (!index) { \
544 GET_NEXT_INDEX() \
545 predictor_pair = s->c_predictor_table[index]; \
546 horiz_pred += ((predictor_pair >> 1) * 5); \
547 if (predictor_pair & 1) \
548 GET_NEXT_INDEX() \
549 else \
550 INC_INDEX; \
551 } \
552 } else \
553 INC_INDEX;
554
555#define APPLY_C_PREDICTOR_24() \
556 predictor_pair = s->c_predictor_table[index]; \
557 horiz_pred += (predictor_pair >> 1); \
558 if (predictor_pair & 1) { \
559 GET_NEXT_INDEX() \
560 if (!index) { \
561 GET_NEXT_INDEX() \
562 predictor_pair = s->fat_c_predictor_table[index]; \
563 horiz_pred += (predictor_pair >> 1); \
564 if (predictor_pair & 1) \
565 GET_NEXT_INDEX() \
566 else \
567 INC_INDEX; \
568 } \
569 } else \
570 INC_INDEX;
571
572
573#define APPLY_Y_PREDICTOR() \
574 predictor_pair = s->y_predictor_table[index]; \
575 horiz_pred += (predictor_pair >> 1); \
576 if (predictor_pair & 1) { \
577 GET_NEXT_INDEX() \
578 if (!index) { \
579 GET_NEXT_INDEX() \
580 predictor_pair = s->y_predictor_table[index]; \
581 horiz_pred += ((predictor_pair >> 1) * 5); \
582 if (predictor_pair & 1) \
583 GET_NEXT_INDEX() \
584 else \
585 INC_INDEX; \
586 } \
587 } else \
588 INC_INDEX;
589
590#define APPLY_Y_PREDICTOR_24() \
591 predictor_pair = s->y_predictor_table[index]; \
592 horiz_pred += (predictor_pair >> 1); \
593 if (predictor_pair & 1) { \
594 GET_NEXT_INDEX() \
595 if (!index) { \
596 GET_NEXT_INDEX() \
597 predictor_pair = s->fat_y_predictor_table[index]; \
598 horiz_pred += (predictor_pair >> 1); \
599 if (predictor_pair & 1) \
600 GET_NEXT_INDEX() \
601 else \
602 INC_INDEX; \
603 } \
604 } else \
605 INC_INDEX;
606
607#define OUTPUT_PIXEL_PAIR() \
608 *current_pixel_pair = *vert_pred + horiz_pred; \
609 *vert_pred++ = *current_pixel_pair++;
610
611static void truemotion1_decode_16bit(TrueMotion1Context *s)
612{
613 int y;
614 int pixels_left; /* remaining pixels on this line */
615 unsigned int predictor_pair;
616 unsigned int horiz_pred;
617 unsigned int *vert_pred;
618 unsigned int *current_pixel_pair;
619 unsigned char *current_line = s->frame->data[0];
620 int keyframe = s->flags & FLAG_KEYFRAME;
621
622 /* these variables are for managing the stream of macroblock change bits */
623 const unsigned char *mb_change_bits = s->mb_change_bits;
624 unsigned char mb_change_byte;
625 unsigned char mb_change_byte_mask;
626 int mb_change_index;
627
628 /* these variables are for managing the main index stream */
629 int index_stream_index = 0; /* yes, the index into the index stream */
630 int index;
631
632 /* clean out the line buffer */
633 memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
634
635 GET_NEXT_INDEX();
636
637 for (y = 0; y < s->avctx->height; y++) {
638
639 /* re-init variables for the next line iteration */
640 horiz_pred = 0;
641 current_pixel_pair = (unsigned int *)current_line;
642 vert_pred = s->vert_pred;
643 mb_change_index = 0;
644 mb_change_byte = mb_change_bits[mb_change_index++];
645 mb_change_byte_mask = 0x01;
646 pixels_left = s->avctx->width;
647
648 while (pixels_left > 0) {
649
650 if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
651
652 switch (y & 3) {
653 case 0:
654 /* if macroblock width is 2, apply C-Y-C-Y; else
655 * apply C-Y-Y */
656 if (s->block_width == 2) {
657 APPLY_C_PREDICTOR();
658 APPLY_Y_PREDICTOR();
659 OUTPUT_PIXEL_PAIR();
660 APPLY_C_PREDICTOR();
661 APPLY_Y_PREDICTOR();
662 OUTPUT_PIXEL_PAIR();
663 } else {
664 APPLY_C_PREDICTOR();
665 APPLY_Y_PREDICTOR();
666 OUTPUT_PIXEL_PAIR();
667 APPLY_Y_PREDICTOR();
668 OUTPUT_PIXEL_PAIR();
669 }
670 break;
671
672 case 1:
673 case 3:
674 /* always apply 2 Y predictors on these iterations */
675 APPLY_Y_PREDICTOR();
676 OUTPUT_PIXEL_PAIR();
677 APPLY_Y_PREDICTOR();
678 OUTPUT_PIXEL_PAIR();
679 break;
680
681 case 2:
682 /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
683 * depending on the macroblock type */
684 if (s->block_type == BLOCK_2x2) {
685 APPLY_C_PREDICTOR();
686 APPLY_Y_PREDICTOR();
687 OUTPUT_PIXEL_PAIR();
688 APPLY_C_PREDICTOR();
689 APPLY_Y_PREDICTOR();
690 OUTPUT_PIXEL_PAIR();
691 } else if (s->block_type == BLOCK_4x2) {
692 APPLY_C_PREDICTOR();
693 APPLY_Y_PREDICTOR();
694 OUTPUT_PIXEL_PAIR();
695 APPLY_Y_PREDICTOR();
696 OUTPUT_PIXEL_PAIR();
697 } else {
698 APPLY_Y_PREDICTOR();
699 OUTPUT_PIXEL_PAIR();
700 APPLY_Y_PREDICTOR();
701 OUTPUT_PIXEL_PAIR();
702 }
703 break;
704 }
705
706 } else {
707
708 /* skip (copy) four pixels, but reassign the horizontal
709 * predictor */
710 *vert_pred++ = *current_pixel_pair++;
711 horiz_pred = *current_pixel_pair - *vert_pred;
712 *vert_pred++ = *current_pixel_pair++;
713
714 }
715
716 if (!keyframe) {
717 mb_change_byte_mask <<= 1;
718
719 /* next byte */
720 if (!mb_change_byte_mask) {
721 mb_change_byte = mb_change_bits[mb_change_index++];
722 mb_change_byte_mask = 0x01;
723 }
724 }
725
726 pixels_left -= 4;
727 }
728
729 /* next change row */
730 if (((y + 1) & 3) == 0)
731 mb_change_bits += s->mb_change_bits_row_size;
732
733 current_line += s->frame->linesize[0];
734 }
735}
736
737static void truemotion1_decode_24bit(TrueMotion1Context *s)
738{
739 int y;
740 int pixels_left; /* remaining pixels on this line */
741 unsigned int predictor_pair;
742 unsigned int horiz_pred;
743 unsigned int *vert_pred;
744 unsigned int *current_pixel_pair;
745 unsigned char *current_line = s->frame->data[0];
746 int keyframe = s->flags & FLAG_KEYFRAME;
747
748 /* these variables are for managing the stream of macroblock change bits */
749 const unsigned char *mb_change_bits = s->mb_change_bits;
750 unsigned char mb_change_byte;
751 unsigned char mb_change_byte_mask;
752 int mb_change_index;
753
754 /* these variables are for managing the main index stream */
755 int index_stream_index = 0; /* yes, the index into the index stream */
756 int index;
757
758 /* clean out the line buffer */
759 memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
760
761 GET_NEXT_INDEX();
762
763 for (y = 0; y < s->avctx->height; y++) {
764
765 /* re-init variables for the next line iteration */
766 horiz_pred = 0;
767 current_pixel_pair = (unsigned int *)current_line;
768 vert_pred = s->vert_pred;
769 mb_change_index = 0;
770 mb_change_byte = mb_change_bits[mb_change_index++];
771 mb_change_byte_mask = 0x01;
772 pixels_left = s->avctx->width;
773
774 while (pixels_left > 0) {
775
776 if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
777
778 switch (y & 3) {
779 case 0:
780 /* if macroblock width is 2, apply C-Y-C-Y; else
781 * apply C-Y-Y */
782 if (s->block_width == 2) {
783 APPLY_C_PREDICTOR_24();
784 APPLY_Y_PREDICTOR_24();
785 OUTPUT_PIXEL_PAIR();
786 APPLY_C_PREDICTOR_24();
787 APPLY_Y_PREDICTOR_24();
788 OUTPUT_PIXEL_PAIR();
789 } else {
790 APPLY_C_PREDICTOR_24();
791 APPLY_Y_PREDICTOR_24();
792 OUTPUT_PIXEL_PAIR();
793 APPLY_Y_PREDICTOR_24();
794 OUTPUT_PIXEL_PAIR();
795 }
796 break;
797
798 case 1:
799 case 3:
800 /* always apply 2 Y predictors on these iterations */
801 APPLY_Y_PREDICTOR_24();
802 OUTPUT_PIXEL_PAIR();
803 APPLY_Y_PREDICTOR_24();
804 OUTPUT_PIXEL_PAIR();
805 break;
806
807 case 2:
808 /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
809 * depending on the macroblock type */
810 if (s->block_type == BLOCK_2x2) {
811 APPLY_C_PREDICTOR_24();
812 APPLY_Y_PREDICTOR_24();
813 OUTPUT_PIXEL_PAIR();
814 APPLY_C_PREDICTOR_24();
815 APPLY_Y_PREDICTOR_24();
816 OUTPUT_PIXEL_PAIR();
817 } else if (s->block_type == BLOCK_4x2) {
818 APPLY_C_PREDICTOR_24();
819 APPLY_Y_PREDICTOR_24();
820 OUTPUT_PIXEL_PAIR();
821 APPLY_Y_PREDICTOR_24();
822 OUTPUT_PIXEL_PAIR();
823 } else {
824 APPLY_Y_PREDICTOR_24();
825 OUTPUT_PIXEL_PAIR();
826 APPLY_Y_PREDICTOR_24();
827 OUTPUT_PIXEL_PAIR();
828 }
829 break;
830 }
831
832 } else {
833
834 /* skip (copy) four pixels, but reassign the horizontal
835 * predictor */
836 *vert_pred++ = *current_pixel_pair++;
837 horiz_pred = *current_pixel_pair - *vert_pred;
838 *vert_pred++ = *current_pixel_pair++;
839
840 }
841
842 if (!keyframe) {
843 mb_change_byte_mask <<= 1;
844
845 /* next byte */
846 if (!mb_change_byte_mask) {
847 mb_change_byte = mb_change_bits[mb_change_index++];
848 mb_change_byte_mask = 0x01;
849 }
850 }
851
852 pixels_left -= 2;
853 }
854
855 /* next change row */
856 if (((y + 1) & 3) == 0)
857 mb_change_bits += s->mb_change_bits_row_size;
858
859 current_line += s->frame->linesize[0];
860 }
861}
862
863
864static int truemotion1_decode_frame(AVCodecContext *avctx,
865 void *data, int *got_frame,
866 AVPacket *avpkt)
867{
868 const uint8_t *buf = avpkt->data;
869 int ret, buf_size = avpkt->size;
870 TrueMotion1Context *s = avctx->priv_data;
871
872 s->buf = buf;
873 s->size = buf_size;
874
875 if ((ret = truemotion1_decode_header(s)) < 0)
876 return ret;
877
878 if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
879 return ret;
880
881 if (compression_types[s->compression].algorithm == ALGO_RGB24H) {
882 truemotion1_decode_24bit(s);
883 } else if (compression_types[s->compression].algorithm != ALGO_NOP) {
884 truemotion1_decode_16bit(s);
885 }
886
887 if ((ret = av_frame_ref(data, s->frame)) < 0)
888 return ret;
889
890 *got_frame = 1;
891
892 /* report that the buffer was completely consumed */
893 return buf_size;
894}
895
896static av_cold int truemotion1_decode_end(AVCodecContext *avctx)
897{
898 TrueMotion1Context *s = avctx->priv_data;
899
900 av_frame_free(&s->frame);
901 av_freep(&s->vert_pred);
902
903 return 0;
904}
905
906AVCodec ff_truemotion1_decoder = {
907 .name = "truemotion1",
908 .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 1.0"),
909 .type = AVMEDIA_TYPE_VIDEO,
910 .id = AV_CODEC_ID_TRUEMOTION1,
911 .priv_data_size = sizeof(TrueMotion1Context),
912 .init = truemotion1_decode_init,
913 .close = truemotion1_decode_end,
914 .decode = truemotion1_decode_frame,
915 .capabilities = CODEC_CAP_DR1,
916};
ffmpeg Piment Noir Debian package repository