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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 | ||
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 | ||
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 | |
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 << 5) + (lo << 10); | |
181 | hi = ydt[p2]; | |
182 | hi += (hi << 5) + (hi << 10); | |
183 | return (lo + (hi << 16)) << 1; | |
184 | } | |
185 | ||
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] << 10; | |
192 | lo = b + r; | |
193 | return (lo + (lo << 16)) << 1; | |
194 | } | |
195 | ||
196 | #if HAVE_BIGENDIAN | |
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 | ||
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 << 16)) << 1; | |
219 | } | |
220 | ||
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 << 8) + (hi << 16)) << 1; | |
228 | } | |
229 | ||
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]<<16; | |
236 | return (b+r) << 1; | |
237 | } | |
238 | ||
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 | ||
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 | ||
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 */ | |
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_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 | ||
469 | static 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 | /* | |
495 | Block decoding order: | |
496 | ||
497 | dxi: Y-Y | |
498 | dxic: Y-C-Y | |
499 | dxic2: Y-C-Y-C | |
500 | ||
501 | hres,vres,i,i%vres (0 < i < 4) | |
502 | 2x2 0: 0 dxic2 | |
503 | 2x2 1: 1 dxi | |
504 | 2x2 2: 0 dxic2 | |
505 | 2x2 3: 1 dxi | |
506 | 2x4 0: 0 dxic2 | |
507 | 2x4 1: 1 dxi | |
508 | 2x4 2: 2 dxi | |
509 | 2x4 3: 3 dxi | |
510 | 4x2 0: 0 dxic | |
511 | 4x2 1: 1 dxi | |
512 | 4x2 2: 0 dxic | |
513 | 4x2 3: 1 dxi | |
514 | 4x4 0: 0 dxic | |
515 | 4x4 1: 1 dxi | |
516 | 4x4 2: 2 dxi | |
517 | 4x4 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 \ | |
530 | do { \ | |
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 | ||
611 | static 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 | ||
737 | static 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 | ||
864 | static 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 | ||
896 | static 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 | ||
906 | AVCodec 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 | }; |