FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/truemotion1.c
Date: 2025-07-28 20:30:09
Exec Total Coverage
Lines: 264 357 73.9%
Functions: 13 16 81.2%
Branches: 291 736 39.5%
Line Branch Exec Source
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 "codec_internal.h"
38 #include "decode.h"
39 #include "libavutil/imgutils.h"
40 #include "libavutil/internal.h"
41 #include "libavutil/intreadwrite.h"
42 #include "libavutil/mem.h"
43
44 #include "truemotion1data.h"
45
46 typedef struct TrueMotion1Context {
47 AVCodecContext *avctx;
48 AVFrame *frame;
49
50 const uint8_t *buf;
51 int size;
52
53 const uint8_t *mb_change_bits;
54 int mb_change_bits_row_size;
55 const uint8_t *index_stream;
56 int index_stream_size;
57
58 int flags;
59 int x, y, w, h;
60
61 uint32_t y_predictor_table[1024];
62 uint32_t c_predictor_table[1024];
63 uint32_t fat_y_predictor_table[1024];
64 uint32_t fat_c_predictor_table[1024];
65
66 int compression;
67 int block_type;
68 int block_width;
69 int block_height;
70
71 int16_t ydt[8];
72 int16_t cdt[8];
73 int16_t fat_ydt[8];
74 int16_t fat_cdt[8];
75
76 int last_deltaset, last_vectable;
77
78 unsigned int *vert_pred;
79 int vert_pred_size;
80
81 } TrueMotion1Context;
82
83 #define FLAG_SPRITE 32
84 #define FLAG_KEYFRAME 16
85 #define FLAG_INTERFRAME 8
86 #define FLAG_INTERPOLATED 4
87
88 struct frame_header {
89 uint8_t header_size;
90 uint8_t compression;
91 uint8_t deltaset;
92 uint8_t vectable;
93 uint16_t ysize;
94 uint16_t xsize;
95 uint16_t checksum;
96 uint8_t version;
97 uint8_t header_type;
98 uint8_t flags;
99 uint8_t control;
100 uint16_t xoffset;
101 uint16_t yoffset;
102 uint16_t width;
103 uint16_t height;
104 };
105
106 #define ALGO_NOP 0
107 #define ALGO_RGB16V 1
108 #define ALGO_RGB16H 2
109 #define ALGO_RGB24H 3
110
111 /* these are the various block sizes that can occupy a 4x4 block */
112 #define BLOCK_2x2 0
113 #define BLOCK_2x4 1
114 #define BLOCK_4x2 2
115 #define BLOCK_4x4 3
116
117 typedef struct comp_types {
118 int algorithm;
119 int block_width; // vres
120 int block_height; // hres
121 int block_type;
122 } comp_types;
123
124 /* { valid for metatype }, algorithm, num of deltas, vert res, horiz res */
125 static const comp_types compression_types[17] = {
126 { ALGO_NOP, 0, 0, 0 },
127
128 { ALGO_RGB16V, 4, 4, BLOCK_4x4 },
129 { ALGO_RGB16H, 4, 4, BLOCK_4x4 },
130 { ALGO_RGB16V, 4, 2, BLOCK_4x2 },
131 { ALGO_RGB16H, 4, 2, BLOCK_4x2 },
132
133 { ALGO_RGB16V, 2, 4, BLOCK_2x4 },
134 { ALGO_RGB16H, 2, 4, BLOCK_2x4 },
135 { ALGO_RGB16V, 2, 2, BLOCK_2x2 },
136 { ALGO_RGB16H, 2, 2, BLOCK_2x2 },
137
138 { ALGO_NOP, 4, 4, BLOCK_4x4 },
139 { ALGO_RGB24H, 4, 4, BLOCK_4x4 },
140 { ALGO_NOP, 4, 2, BLOCK_4x2 },
141 { ALGO_RGB24H, 4, 2, BLOCK_4x2 },
142
143 { ALGO_NOP, 2, 4, BLOCK_2x4 },
144 { ALGO_RGB24H, 2, 4, BLOCK_2x4 },
145 { ALGO_NOP, 2, 2, BLOCK_2x2 },
146 { ALGO_RGB24H, 2, 2, BLOCK_2x2 }
147 };
148
149 4 static void select_delta_tables(TrueMotion1Context *s, int delta_table_index)
150 {
151 int i;
152
153
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 4 if (delta_table_index > 3)
154 ✗ return;
155
156 4 memcpy(s->ydt, ydts[delta_table_index], 8 * sizeof(int16_t));
157 4 memcpy(s->cdt, cdts[delta_table_index], 8 * sizeof(int16_t));
158 4 memcpy(s->fat_ydt, fat_ydts[delta_table_index], 8 * sizeof(int16_t));
159 4 memcpy(s->fat_cdt, fat_cdts[delta_table_index], 8 * sizeof(int16_t));
160
161 /* Y skinny deltas need to be halved for some reason; maybe the
162 * skinny Y deltas should be modified */
163
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 36 for (i = 0; i < 8; i++)
164 {
165 /* drop the lsb before dividing by 2-- net effect: round down
166 * when dividing a negative number (e.g., -3/2 = -2, not -1) */
167 32 s->ydt[i] &= 0xFFFE;
168 32 s->ydt[i] /= 2;
169 }
170 }
171
172 #if HAVE_BIGENDIAN
173 static int make_ydt15_entry(int p2, int p1, int16_t *ydt)
174 #else
175 1104 static int make_ydt15_entry(int p1, int p2, int16_t *ydt)
176 #endif
177 {
178 int lo, hi;
179
180 1104 lo = ydt[p1];
181 1104 lo += (lo * 32) + (lo * 1024);
182 1104 hi = ydt[p2];
183 1104 hi += (hi * 32) + (hi * 1024);
184 1104 return (lo + (hi * (1U << 16))) * 2;
185 }
186
187 1104 static int make_cdt15_entry(int p1, int p2, int16_t *cdt)
188 {
189 int r, b, lo;
190
191 1104 b = cdt[p2];
192 1104 r = cdt[p1] * 1024;
193 1104 lo = b + r;
194 1104 return (lo + (lo * (1U << 16))) * 2;
195 }
196
197 #if HAVE_BIGENDIAN
198 static int make_ydt16_entry(int p2, int p1, int16_t *ydt)
199 #else
200 ✗ static int make_ydt16_entry(int p1, int p2, int16_t *ydt)
201 #endif
202 {
203 int lo, hi;
204
205 ✗ lo = ydt[p1];
206 ✗ lo += (lo << 6) + (lo << 11);
207 ✗ hi = ydt[p2];
208 ✗ hi += (hi << 6) + (hi << 11);
209 ✗ return (lo + (hi << 16)) << 1;
210 }
211
212 ✗ static int make_cdt16_entry(int p1, int p2, int16_t *cdt)
213 {
214 int r, b, lo;
215
216 ✗ b = cdt[p2];
217 ✗ r = cdt[p1] << 11;
218 ✗ lo = b + r;
219 ✗ return (lo + (lo * (1 << 16))) * 2;
220 }
221
222 2048 static int make_ydt24_entry(int p1, int p2, int16_t *ydt)
223 {
224 int lo, hi;
225
226 2048 lo = ydt[p1];
227 2048 hi = ydt[p2];
228 2048 return (lo + (hi * (1 << 8)) + (hi * (1 << 16))) * 2;
229 }
230
231 2048 static int make_cdt24_entry(int p1, int p2, int16_t *cdt)
232 {
233 int r, b;
234
235 2048 b = cdt[p2];
236 2048 r = cdt[p1] * (1 << 16);
237 2048 return (b+r) * 2;
238 }
239
240 2 static void gen_vector_table15(TrueMotion1Context *s, const uint8_t *sel_vector_table)
241 {
242 int len, i, j;
243 unsigned char delta_pair;
244
245
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 514 for (i = 0; i < 1024; i += 4)
246 {
247 512 len = *sel_vector_table++ / 2;
248
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 1616 for (j = 0; j < len; j++)
249 {
250 1104 delta_pair = *sel_vector_table++;
251 1104 s->y_predictor_table[i+j] = 0xfffffffe &
252 1104 make_ydt15_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
253 1104 s->c_predictor_table[i+j] = 0xfffffffe &
254 1104 make_cdt15_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
255 }
256 512 s->y_predictor_table[i+(j-1)] |= 1;
257 512 s->c_predictor_table[i+(j-1)] |= 1;
258 }
259 2 }
260
261 ✗ static void gen_vector_table16(TrueMotion1Context *s, const uint8_t *sel_vector_table)
262 {
263 int len, i, j;
264 unsigned char delta_pair;
265
266 ✗ for (i = 0; i < 1024; i += 4)
267 {
268 ✗ len = *sel_vector_table++ / 2;
269 ✗ for (j = 0; j < len; j++)
270 {
271 ✗ delta_pair = *sel_vector_table++;
272 ✗ s->y_predictor_table[i+j] = 0xfffffffe &
273 ✗ make_ydt16_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
274 ✗ s->c_predictor_table[i+j] = 0xfffffffe &
275 ✗ make_cdt16_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
276 }
277 ✗ s->y_predictor_table[i+(j-1)] |= 1;
278 ✗ s->c_predictor_table[i+(j-1)] |= 1;
279 }
280 ✗ }
281
282 2 static void gen_vector_table24(TrueMotion1Context *s, const uint8_t *sel_vector_table)
283 {
284 int len, i, j;
285 unsigned char delta_pair;
286
287
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 514 for (i = 0; i < 1024; i += 4)
288 {
289 512 len = *sel_vector_table++ / 2;
290
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 1536 for (j = 0; j < len; j++)
291 {
292 1024 delta_pair = *sel_vector_table++;
293 1024 s->y_predictor_table[i+j] = 0xfffffffe &
294 1024 make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
295 1024 s->c_predictor_table[i+j] = 0xfffffffe &
296 1024 make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
297 1024 s->fat_y_predictor_table[i+j] = 0xfffffffe &
298 1024 make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_ydt);
299 1024 s->fat_c_predictor_table[i+j] = 0xfffffffe &
300 1024 make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_cdt);
301 }
302 512 s->y_predictor_table[i+(j-1)] |= 1;
303 512 s->c_predictor_table[i+(j-1)] |= 1;
304 512 s->fat_y_predictor_table[i+(j-1)] |= 1;
305 512 s->fat_c_predictor_table[i+(j-1)] |= 1;
306 }
307 2 }
308
309 /* Returns the number of bytes consumed from the bytestream. Returns -1 if
310 * there was an error while decoding the header */
311 123 static int truemotion1_decode_header(TrueMotion1Context *s)
312 {
313 int i, ret;
314 123 int width_shift = 0;
315 int new_pix_fmt;
316 struct frame_header header;
317 123 uint8_t header_buffer[128] = { 0 }; /* logical maximum size of the header */
318 const uint8_t *sel_vector_table;
319
320 123 header.header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f;
321
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 123 if (s->buf[0] < 0x10)
322 {
323 ✗ av_log(s->avctx, AV_LOG_ERROR, "invalid header size (%d)\n", s->buf[0]);
324 ✗ return AVERROR_INVALIDDATA;
325 }
326
327
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 123 if (header.header_size + 1 > s->size) {
328 ✗ av_log(s->avctx, AV_LOG_ERROR, "Input packet too small.\n");
329 ✗ return AVERROR_INVALIDDATA;
330 }
331
332 /* unscramble the header bytes with a XOR operation */
333
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 1816 for (i = 1; i < header.header_size; i++)
334 1693 header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1];
335
336 123 header.compression = header_buffer[0];
337 123 header.deltaset = header_buffer[1];
338 123 header.vectable = header_buffer[2];
339 123 header.ysize = AV_RL16(&header_buffer[3]);
340 123 header.xsize = AV_RL16(&header_buffer[5]);
341 123 header.checksum = AV_RL16(&header_buffer[7]);
342 123 header.version = header_buffer[9];
343 123 header.header_type = header_buffer[10];
344 123 header.flags = header_buffer[11];
345 123 header.control = header_buffer[12];
346
347 /* Version 2 */
348
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 123 if (header.version >= 2)
349 {
350
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 123 if (header.header_type > 3)
351 {
352 ✗ av_log(s->avctx, AV_LOG_ERROR, "invalid header type (%d)\n", header.header_type);
353 ✗ return AVERROR_INVALIDDATA;
354
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 123 } else if ((header.header_type == 2) || (header.header_type == 3)) {
355 123 s->flags = header.flags;
356
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 123 if (!(s->flags & FLAG_INTERFRAME))
357 ✗ s->flags |= FLAG_KEYFRAME;
358 } else
359 ✗ s->flags = FLAG_KEYFRAME;
360 } else /* Version 1 */
361 ✗ s->flags = FLAG_KEYFRAME;
362
363
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 123 if (s->flags & FLAG_SPRITE) {
364 ✗ avpriv_request_sample(s->avctx, "Frame with sprite");
365 /* FIXME header.width, height, xoffset and yoffset aren't initialized */
366 ✗ return AVERROR_PATCHWELCOME;
367 } else {
368 123 s->w = header.xsize;
369 123 s->h = header.ysize;
370
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 123 if (header.header_type < 2) {
371 ✗ if ((s->w < 213) && (s->h >= 176))
372 {
373 ✗ s->flags |= FLAG_INTERPOLATED;
374 ✗ avpriv_request_sample(s->avctx, "Interpolated frame");
375 }
376 }
377 }
378
379
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 123 if (header.compression >= 17) {
380 ✗ av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression);
381 ✗ return AVERROR_INVALIDDATA;
382 }
383
384
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 123 if ((header.deltaset != s->last_deltaset) ||
385
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 121 (header.vectable != s->last_vectable))
386 4 select_delta_tables(s, header.deltaset);
387
388
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 123 if ((header.compression & 1) && header.header_type)
389 ✗ sel_vector_table = pc_tbl2;
390 else {
391
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 123 if (header.vectable > 0 && header.vectable < 4)
392 123 sel_vector_table = tables[header.vectable - 1];
393 else {
394 ✗ av_log(s->avctx, AV_LOG_ERROR, "invalid vector table id (%d)\n", header.vectable);
395 ✗ return AVERROR_INVALIDDATA;
396 }
397 }
398
399
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 123 if (compression_types[header.compression].algorithm == ALGO_RGB24H) {
400 17 new_pix_fmt = AV_PIX_FMT_0RGB32;
401 17 width_shift = 1;
402 } else
403 106 new_pix_fmt = AV_PIX_FMT_RGB555; // RGB565 is supported as well
404
405 123 s->w >>= width_shift;
406
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 123 if (s->w & 1) {
407 ✗ avpriv_request_sample(s->avctx, "Frame with odd width");
408 ✗ return AVERROR_PATCHWELCOME;
409 }
410
411
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 123 if (s->h & 3) {
412 ✗ avpriv_request_sample(s->avctx, "Frame with height not being a multiple of 4");
413 ✗ return AVERROR_PATCHWELCOME;
414 }
415
416
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 123 if (s->w != s->avctx->width || s->h != s->avctx->height ||
417
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 122 new_pix_fmt != s->avctx->pix_fmt) {
418 2 av_frame_unref(s->frame);
419 2 s->avctx->sample_aspect_ratio = (AVRational){ 1 << width_shift, 1 };
420 2 s->avctx->pix_fmt = new_pix_fmt;
421
422
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 2 if ((ret = ff_set_dimensions(s->avctx, s->w, s->h)) < 0)
423 ✗ return ret;
424
425 2 ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
426
427 2 av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
428
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 2 if (!s->vert_pred)
429 ✗ return AVERROR(ENOMEM);
430 }
431
432 /* There is 1 change bit per 4 pixels, so each change byte represents
433 * 32 pixels; divide width by 4 to obtain the number of change bits and
434 * then round up to the nearest byte. */
435 123 s->mb_change_bits_row_size = ((s->avctx->width >> (2 - width_shift)) + 7) >> 3;
436
437
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 123 if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable))
438 {
439
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 4 if (compression_types[header.compression].algorithm == ALGO_RGB24H)
440 2 gen_vector_table24(s, sel_vector_table);
441 else
442
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 2 if (s->avctx->pix_fmt == AV_PIX_FMT_RGB555)
443 2 gen_vector_table15(s, sel_vector_table);
444 else
445 ✗ gen_vector_table16(s, sel_vector_table);
446 }
447
448 /* set up pointers to the other key data chunks */
449 123 s->mb_change_bits = s->buf + header.header_size;
450
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 123 if (s->flags & FLAG_KEYFRAME) {
451 /* no change bits specified for a keyframe; only index bytes */
452 25 s->index_stream = s->mb_change_bits;
453
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 25 if (s->avctx->width * s->avctx->height / 2048 + header.header_size > s->size)
454 ✗ return AVERROR_INVALIDDATA;
455 } else {
456 /* one change bit per 4x4 block */
457 98 s->index_stream = s->mb_change_bits +
458 98 (s->mb_change_bits_row_size * (s->avctx->height >> 2));
459 }
460 123 s->index_stream_size = s->size - (s->index_stream - s->buf);
461
462 123 s->last_deltaset = header.deltaset;
463 123 s->last_vectable = header.vectable;
464 123 s->compression = header.compression;
465 123 s->block_width = compression_types[header.compression].block_width;
466 123 s->block_height = compression_types[header.compression].block_height;
467 123 s->block_type = compression_types[header.compression].block_type;
468
469
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 123 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
470 ✗ av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n",
471 s->last_deltaset, s->last_vectable, s->compression, s->block_width,
472 s->block_height, s->block_type,
473 ✗ s->flags & FLAG_KEYFRAME ? " KEY" : "",
474 ✗ s->flags & FLAG_INTERFRAME ? " INTER" : "",
475 ✗ s->flags & FLAG_SPRITE ? " SPRITE" : "",
476 ✗ s->flags & FLAG_INTERPOLATED ? " INTERPOL" : "");
477
478 123 return header.header_size;
479 }
480
481 4 static av_cold int truemotion1_decode_init(AVCodecContext *avctx)
482 {
483 4 TrueMotion1Context *s = avctx->priv_data;
484
485 4 s->avctx = avctx;
486
487 // FIXME: it may change ?
488 // if (avctx->bits_per_sample == 24)
489 // avctx->pix_fmt = AV_PIX_FMT_RGB24;
490 // else
491 // avctx->pix_fmt = AV_PIX_FMT_RGB555;
492
493 4 s->frame = av_frame_alloc();
494
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 4 if (!s->frame)
495 ✗ return AVERROR(ENOMEM);
496
497 /* there is a vertical predictor for each pixel in a line; each vertical
498 * predictor is 0 to start with */
499 4 av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
500
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 4 if (!s->vert_pred)
501 ✗ return AVERROR(ENOMEM);
502
503 4 return 0;
504 }
505
506 /*
507 Block decoding order:
508
509 dxi: Y-Y
510 dxic: Y-C-Y
511 dxic2: Y-C-Y-C
512
513 hres,vres,i,i%vres (0 < i < 4)
514 2x2 0: 0 dxic2
515 2x2 1: 1 dxi
516 2x2 2: 0 dxic2
517 2x2 3: 1 dxi
518 2x4 0: 0 dxic2
519 2x4 1: 1 dxi
520 2x4 2: 2 dxi
521 2x4 3: 3 dxi
522 4x2 0: 0 dxic
523 4x2 1: 1 dxi
524 4x2 2: 0 dxic
525 4x2 3: 1 dxi
526 4x4 0: 0 dxic
527 4x4 1: 1 dxi
528 4x4 2: 2 dxi
529 4x4 3: 3 dxi
530 */
531
532 #define GET_NEXT_INDEX() \
533 {\
534 if (index_stream_index >= s->index_stream_size) { \
535 av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \
536 return; \
537 } \
538 index = s->index_stream[index_stream_index++] * 4; \
539 }
540
541 #define INC_INDEX \
542 do { \
543 if (index >= 1023) { \
544 av_log(s->avctx, AV_LOG_ERROR, "Invalid index value.\n"); \
545 return; \
546 } \
547 index++; \
548 } while (0)
549
550 #define APPLY_C_PREDICTOR() \
551 predictor_pair = s->c_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->c_predictor_table[index]; \
558 horiz_pred += ((predictor_pair >> 1) * 5); \
559 if (predictor_pair & 1) \
560 GET_NEXT_INDEX() \
561 else \
562 INC_INDEX; \
563 } \
564 } else \
565 INC_INDEX;
566
567 #define APPLY_C_PREDICTOR_24() \
568 predictor_pair = s->c_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_c_predictor_table[index]; \
575 horiz_pred += (predictor_pair >> 1); \
576 if (predictor_pair & 1) \
577 GET_NEXT_INDEX() \
578 else \
579 INC_INDEX; \
580 } \
581 } else \
582 INC_INDEX;
583
584
585 #define APPLY_Y_PREDICTOR() \
586 predictor_pair = s->y_predictor_table[index]; \
587 horiz_pred += (predictor_pair >> 1); \
588 if (predictor_pair & 1) { \
589 GET_NEXT_INDEX() \
590 if (!index) { \
591 GET_NEXT_INDEX() \
592 predictor_pair = s->y_predictor_table[index]; \
593 horiz_pred += ((predictor_pair >> 1) * 5); \
594 if (predictor_pair & 1) \
595 GET_NEXT_INDEX() \
596 else \
597 INC_INDEX; \
598 } \
599 } else \
600 INC_INDEX;
601
602 #define APPLY_Y_PREDICTOR_24() \
603 predictor_pair = s->y_predictor_table[index]; \
604 horiz_pred += (predictor_pair >> 1); \
605 if (predictor_pair & 1) { \
606 GET_NEXT_INDEX() \
607 if (!index) { \
608 GET_NEXT_INDEX() \
609 predictor_pair = s->fat_y_predictor_table[index]; \
610 horiz_pred += (predictor_pair >> 1); \
611 if (predictor_pair & 1) \
612 GET_NEXT_INDEX() \
613 else \
614 INC_INDEX; \
615 } \
616 } else \
617 INC_INDEX;
618
619 #define OUTPUT_PIXEL_PAIR() \
620 *current_pixel_pair = *vert_pred + horiz_pred; \
621 *vert_pred++ = *current_pixel_pair++;
622
623 97 static void truemotion1_decode_16bit(TrueMotion1Context *s)
624 {
625 int y;
626 int pixels_left; /* remaining pixels on this line */
627 unsigned int predictor_pair;
628 unsigned int horiz_pred;
629 unsigned int *vert_pred;
630 unsigned int *current_pixel_pair;
631 97 unsigned char *current_line = s->frame->data[0];
632 97 int keyframe = s->flags & FLAG_KEYFRAME;
633
634 /* these variables are for managing the stream of macroblock change bits */
635 97 const unsigned char *mb_change_bits = s->mb_change_bits;
636 unsigned char mb_change_byte;
637 unsigned char mb_change_byte_mask;
638 int mb_change_index;
639
640 /* these variables are for managing the main index stream */
641 97 int index_stream_index = 0; /* yes, the index into the index stream */
642 int index;
643
644 /* clean out the line buffer */
645 97 memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
646
647
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 97 GET_NEXT_INDEX();
648
649
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 16393 for (y = 0; y < s->avctx->height; y++) {
650
651 /* re-init variables for the next line iteration */
652 16296 horiz_pred = 0;
653 16296 current_pixel_pair = (unsigned int *)current_line;
654 16296 vert_pred = s->vert_pred;
655 16296 mb_change_index = 0;
656
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 16296 if (!keyframe)
657 12600 mb_change_byte = mb_change_bits[mb_change_index++];
658 16296 mb_change_byte_mask = 0x01;
659 16296 pixels_left = s->avctx->width;
660
661
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 1319976 while (pixels_left > 0) {
662
663
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 1303680 if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
664
665
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 706460 switch (y & 3) {
666 176615 case 0:
667 /* if macroblock width is 2, apply C-Y-C-Y; else
668 * apply C-Y-Y */
669
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 176615 if (s->block_width == 2) {
670 ✗ APPLY_C_PREDICTOR();
671 ✗ APPLY_Y_PREDICTOR();
672 ✗ OUTPUT_PIXEL_PAIR();
673 ✗ APPLY_C_PREDICTOR();
674 ✗ APPLY_Y_PREDICTOR();
675 ✗ OUTPUT_PIXEL_PAIR();
676 } else {
677
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 176615 APPLY_C_PREDICTOR();
678
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 176615 APPLY_Y_PREDICTOR();
679 176615 OUTPUT_PIXEL_PAIR();
680
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 176615 APPLY_Y_PREDICTOR();
681 176615 OUTPUT_PIXEL_PAIR();
682 }
683 176615 break;
684
685 353230 case 1:
686 case 3:
687 /* always apply 2 Y predictors on these iterations */
688
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 353230 APPLY_Y_PREDICTOR();
689 353230 OUTPUT_PIXEL_PAIR();
690
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 353230 APPLY_Y_PREDICTOR();
691 353230 OUTPUT_PIXEL_PAIR();
692 353230 break;
693
694 176615 case 2:
695 /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
696 * depending on the macroblock type */
697
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 176615 if (s->block_type == BLOCK_2x2) {
698 ✗ APPLY_C_PREDICTOR();
699 ✗ APPLY_Y_PREDICTOR();
700 ✗ OUTPUT_PIXEL_PAIR();
701 ✗ APPLY_C_PREDICTOR();
702 ✗ APPLY_Y_PREDICTOR();
703 ✗ OUTPUT_PIXEL_PAIR();
704
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 176615 } else if (s->block_type == BLOCK_4x2) {
705 ✗ APPLY_C_PREDICTOR();
706 ✗ APPLY_Y_PREDICTOR();
707 ✗ OUTPUT_PIXEL_PAIR();
708 ✗ APPLY_Y_PREDICTOR();
709 ✗ OUTPUT_PIXEL_PAIR();
710 } else {
711
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 176615 APPLY_Y_PREDICTOR();
712 176615 OUTPUT_PIXEL_PAIR();
713
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 176615 APPLY_Y_PREDICTOR();
714 176615 OUTPUT_PIXEL_PAIR();
715 }
716 176615 break;
717 }
718
719 } else {
720
721 /* skip (copy) four pixels, but reassign the horizontal
722 * predictor */
723 597220 *vert_pred++ = *current_pixel_pair++;
724 597220 horiz_pred = *current_pixel_pair - *vert_pred;
725 597220 *vert_pred++ = *current_pixel_pair++;
726
727 }
728
729
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 1303680 if (!keyframe) {
730 1008000 mb_change_byte_mask <<= 1;
731
732 /* next byte */
733
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 1008000 if (!mb_change_byte_mask) {
734 126000 mb_change_byte = mb_change_bits[mb_change_index++];
735 126000 mb_change_byte_mask = 0x01;
736 }
737 }
738
739 1303680 pixels_left -= 4;
740 }
741
742 /* next change row */
743
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 16296 if (((y + 1) & 3) == 0)
744 4074 mb_change_bits += s->mb_change_bits_row_size;
745
746 16296 current_line += s->frame->linesize[0];
747 }
748 }
749
750 17 static void truemotion1_decode_24bit(TrueMotion1Context *s)
751 {
752 int y;
753 int pixels_left; /* remaining pixels on this line */
754 unsigned int predictor_pair;
755 unsigned int horiz_pred;
756 unsigned int *vert_pred;
757 unsigned int *current_pixel_pair;
758 17 unsigned char *current_line = s->frame->data[0];
759 17 int keyframe = s->flags & FLAG_KEYFRAME;
760
761 /* these variables are for managing the stream of macroblock change bits */
762 17 const unsigned char *mb_change_bits = s->mb_change_bits;
763 unsigned char mb_change_byte;
764 unsigned char mb_change_byte_mask;
765 int mb_change_index;
766
767 /* these variables are for managing the main index stream */
768 17 int index_stream_index = 0; /* yes, the index into the index stream */
769 int index;
770
771 /* clean out the line buffer */
772 17 memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
773
774
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 17 GET_NEXT_INDEX();
775
776
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 2707 for (y = 0; y < s->avctx->height; y++) {
777
778 /* re-init variables for the next line iteration */
779 2691 horiz_pred = 0;
780 2691 current_pixel_pair = (unsigned int *)current_line;
781 2691 vert_pred = s->vert_pred;
782 2691 mb_change_index = 0;
783 2691 mb_change_byte = mb_change_bits[mb_change_index++];
784 2691 mb_change_byte_mask = 0x01;
785 2691 pixels_left = s->avctx->width;
786
787
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 196395 while (pixels_left > 0) {
788
789
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 193705 if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
790
791
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 153710 switch (y & 3) {
792 38453 case 0:
793 /* if macroblock width is 2, apply C-Y-C-Y; else
794 * apply C-Y-Y */
795
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 38453 if (s->block_width == 2) {
796
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 38453 APPLY_C_PREDICTOR_24();
797
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 38453 APPLY_Y_PREDICTOR_24();
798 38453 OUTPUT_PIXEL_PAIR();
799
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 38453 APPLY_C_PREDICTOR_24();
800
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 38453 APPLY_Y_PREDICTOR_24();
801 38453 OUTPUT_PIXEL_PAIR();
802 } else {
803 ✗ APPLY_C_PREDICTOR_24();
804 ✗ APPLY_Y_PREDICTOR_24();
805 ✗ OUTPUT_PIXEL_PAIR();
806 ✗ APPLY_Y_PREDICTOR_24();
807 ✗ OUTPUT_PIXEL_PAIR();
808 }
809 38453 break;
810
811 76846 case 1:
812 case 3:
813 /* always apply 2 Y predictors on these iterations */
814
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 76846 APPLY_Y_PREDICTOR_24();
815 76846 OUTPUT_PIXEL_PAIR();
816
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 76846 APPLY_Y_PREDICTOR_24();
817 76846 OUTPUT_PIXEL_PAIR();
818 76846 break;
819
820 38411 case 2:
821 /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
822 * depending on the macroblock type */
823
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 38411 if (s->block_type == BLOCK_2x2) {
824
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 38411 APPLY_C_PREDICTOR_24();
825
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 38411 APPLY_Y_PREDICTOR_24();
826 38411 OUTPUT_PIXEL_PAIR();
827
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 38411 APPLY_C_PREDICTOR_24();
828
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 38411 APPLY_Y_PREDICTOR_24();
829 38410 OUTPUT_PIXEL_PAIR();
830 ✗ } else if (s->block_type == BLOCK_4x2) {
831 ✗ APPLY_C_PREDICTOR_24();
832 ✗ APPLY_Y_PREDICTOR_24();
833 ✗ OUTPUT_PIXEL_PAIR();
834 ✗ APPLY_Y_PREDICTOR_24();
835 ✗ OUTPUT_PIXEL_PAIR();
836 } else {
837 ✗ APPLY_Y_PREDICTOR_24();
838 ✗ OUTPUT_PIXEL_PAIR();
839 ✗ APPLY_Y_PREDICTOR_24();
840 ✗ OUTPUT_PIXEL_PAIR();
841 }
842 38410 break;
843 }
844
845 } else {
846
847 /* skip (copy) four pixels, but reassign the horizontal
848 * predictor */
849 39995 *vert_pred++ = *current_pixel_pair++;
850 39995 horiz_pred = *current_pixel_pair - *vert_pred;
851 39995 *vert_pred++ = *current_pixel_pair++;
852
853 }
854
855
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 193704 if (!keyframe) {
856 159144 mb_change_byte_mask <<= 1;
857
858 /* next byte */
859
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 159144 if (!mb_change_byte_mask) {
860 19893 mb_change_byte = mb_change_bits[mb_change_index++];
861 19893 mb_change_byte_mask = 0x01;
862 }
863 }
864
865 193704 pixels_left -= 2;
866 }
867
868 /* next change row */
869
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 2690 if (((y + 1) & 3) == 0)
870 672 mb_change_bits += s->mb_change_bits_row_size;
871
872 2690 current_line += s->frame->linesize[0];
873 }
874 }
875
876
877 123 static int truemotion1_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
878 int *got_frame, AVPacket *avpkt)
879 {
880 123 const uint8_t *buf = avpkt->data;
881 123 int ret, buf_size = avpkt->size;
882 123 TrueMotion1Context *s = avctx->priv_data;
883
884 123 s->buf = buf;
885 123 s->size = buf_size;
886
887
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 123 if ((ret = truemotion1_decode_header(s)) < 0)
888 ✗ return ret;
889
890
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 123 if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
891 ✗ return ret;
892
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 123 if (compression_types[s->compression].algorithm == ALGO_RGB24H) {
894 17 truemotion1_decode_24bit(s);
895
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 106 } else if (compression_types[s->compression].algorithm != ALGO_NOP) {
896 97 truemotion1_decode_16bit(s);
897 }
898
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 123 if ((ret = av_frame_ref(rframe, s->frame)) < 0)
900 ✗ return ret;
901
902 123 *got_frame = 1;
903
904 /* report that the buffer was completely consumed */
905 123 return buf_size;
906 }
907
908 4 static av_cold int truemotion1_decode_end(AVCodecContext *avctx)
909 {
910 4 TrueMotion1Context *s = avctx->priv_data;
911
912 4 av_frame_free(&s->frame);
913 4 av_freep(&s->vert_pred);
914
915 4 return 0;
916 }
917
918 const FFCodec ff_truemotion1_decoder = {
919 .p.name = "truemotion1",
920 CODEC_LONG_NAME("Duck TrueMotion 1.0"),
921 .p.type = AVMEDIA_TYPE_VIDEO,
922 .p.id = AV_CODEC_ID_TRUEMOTION1,
923 .priv_data_size = sizeof(TrueMotion1Context),
924 .init = truemotion1_decode_init,
925 .close = truemotion1_decode_end,
926 FF_CODEC_DECODE_CB(truemotion1_decode_frame),
927 .p.capabilities = AV_CODEC_CAP_DR1,
928 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
929 };
930