FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/truemotion1.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 263 353 74.5%
Branches: 290 734 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 "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 4 static void select_delta_tables(TrueMotion1Context *s, int delta_table_index)
149 {
150 int i;
151
152
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 4 if (delta_table_index > 3)
153 ✗ return;
154
155 4 memcpy(s->ydt, ydts[delta_table_index], 8 * sizeof(int16_t));
156 4 memcpy(s->cdt, cdts[delta_table_index], 8 * sizeof(int16_t));
157 4 memcpy(s->fat_ydt, fat_ydts[delta_table_index], 8 * sizeof(int16_t));
158 4 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
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 36 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 32 s->ydt[i] &= 0xFFFE;
167 32 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 1104 static int make_ydt15_entry(int p1, int p2, int16_t *ydt)
175 #endif
176 {
177 int lo, hi;
178
179 1104 lo = ydt[p1];
180 1104 lo += (lo * 32) + (lo * 1024);
181 1104 hi = ydt[p2];
182 1104 hi += (hi * 32) + (hi * 1024);
183 1104 return (lo + (hi * (1U << 16))) * 2;
184 }
185
186 1104 static int make_cdt15_entry(int p1, int p2, int16_t *cdt)
187 {
188 int r, b, lo;
189
190 1104 b = cdt[p2];
191 1104 r = cdt[p1] * 1024;
192 1104 lo = b + r;
193 1104 return (lo + (lo * (1U << 16))) * 2;
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 * (1 << 16))) * 2;
219 }
220
221 2048 static int make_ydt24_entry(int p1, int p2, int16_t *ydt)
222 {
223 int lo, hi;
224
225 2048 lo = ydt[p1];
226 2048 hi = ydt[p2];
227 2048 return (lo + (hi * (1 << 8)) + (hi * (1 << 16))) * 2;
228 }
229
230 2048 static int make_cdt24_entry(int p1, int p2, int16_t *cdt)
231 {
232 int r, b;
233
234 2048 b = cdt[p2];
235 2048 r = cdt[p1] * (1 << 16);
236 2048 return (b+r) * 2;
237 }
238
239 2 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
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 514 for (i = 0; i < 1024; i += 4)
245 {
246 512 len = *sel_vector_table++ / 2;
247
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 1616 for (j = 0; j < len; j++)
248 {
249 1104 delta_pair = *sel_vector_table++;
250 1104 s->y_predictor_table[i+j] = 0xfffffffe &
251 1104 make_ydt15_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
252 1104 s->c_predictor_table[i+j] = 0xfffffffe &
253 1104 make_cdt15_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
254 }
255 512 s->y_predictor_table[i+(j-1)] |= 1;
256 512 s->c_predictor_table[i+(j-1)] |= 1;
257 }
258 2 }
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 2 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
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 514 for (i = 0; i < 1024; i += 4)
287 {
288 512 len = *sel_vector_table++ / 2;
289
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 1536 for (j = 0; j < len; j++)
290 {
291 1024 delta_pair = *sel_vector_table++;
292 1024 s->y_predictor_table[i+j] = 0xfffffffe &
293 1024 make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
294 1024 s->c_predictor_table[i+j] = 0xfffffffe &
295 1024 make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
296 1024 s->fat_y_predictor_table[i+j] = 0xfffffffe &
297 1024 make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_ydt);
298 1024 s->fat_c_predictor_table[i+j] = 0xfffffffe &
299 1024 make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_cdt);
300 }
301 512 s->y_predictor_table[i+(j-1)] |= 1;
302 512 s->c_predictor_table[i+(j-1)] |= 1;
303 512 s->fat_y_predictor_table[i+(j-1)] |= 1;
304 512 s->fat_c_predictor_table[i+(j-1)] |= 1;
305 }
306 2 }
307
308 /* Returns the number of bytes consumed from the bytestream. Returns -1 if
309 * there was an error while decoding the header */
310 123 static int truemotion1_decode_header(TrueMotion1Context *s)
311 {
312 int i, ret;
313 123 int width_shift = 0;
314 int new_pix_fmt;
315 struct frame_header header;
316 123 uint8_t header_buffer[128] = { 0 }; /* logical maximum size of the header */
317 const uint8_t *sel_vector_table;
318
319 123 header.header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f;
320
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 123 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
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 123 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
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 1816 for (i = 1; i < header.header_size; i++)
333 1693 header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1];
334
335 123 header.compression = header_buffer[0];
336 123 header.deltaset = header_buffer[1];
337 123 header.vectable = header_buffer[2];
338 123 header.ysize = AV_RL16(&header_buffer[3]);
339 123 header.xsize = AV_RL16(&header_buffer[5]);
340 123 header.checksum = AV_RL16(&header_buffer[7]);
341 123 header.version = header_buffer[9];
342 123 header.header_type = header_buffer[10];
343 123 header.flags = header_buffer[11];
344 123 header.control = header_buffer[12];
345
346 /* Version 2 */
347
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 123 if (header.version >= 2)
348 {
349
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 123 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
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 123 } else if ((header.header_type == 2) || (header.header_type == 3)) {
354 123 s->flags = header.flags;
355
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 123 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
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 123 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 {
367 123 s->w = header.xsize;
368 123 s->h = header.ysize;
369
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 123 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
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 123 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
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 123 if ((header.deltaset != s->last_deltaset) ||
384
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 121 (header.vectable != s->last_vectable))
385 4 select_delta_tables(s, header.deltaset);
386
387
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 123 if ((header.compression & 1) && header.header_type)
388 ✗ sel_vector_table = pc_tbl2;
389 else {
390
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 123 if (header.vectable > 0 && header.vectable < 4)
391 123 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
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 123 if (compression_types[header.compression].algorithm == ALGO_RGB24H) {
399 17 new_pix_fmt = AV_PIX_FMT_0RGB32;
400 17 width_shift = 1;
401 } else
402 106 new_pix_fmt = AV_PIX_FMT_RGB555; // RGB565 is supported as well
403
404 123 s->w >>= width_shift;
405
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 123 if (s->w & 1) {
406 ✗ avpriv_request_sample(s->avctx, "Frame with odd width");
407 ✗ return AVERROR_PATCHWELCOME;
408 }
409
410
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 123 if (s->w != s->avctx->width || s->h != s->avctx->height ||
411
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 122 new_pix_fmt != s->avctx->pix_fmt) {
412 2 av_frame_unref(s->frame);
413 2 s->avctx->sample_aspect_ratio = (AVRational){ 1 << width_shift, 1 };
414 2 s->avctx->pix_fmt = new_pix_fmt;
415
416
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 2 if ((ret = ff_set_dimensions(s->avctx, s->w, s->h)) < 0)
417 ✗ return ret;
418
419 2 ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
420
421 2 av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
422
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 2 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. */
429 123 s->mb_change_bits_row_size = ((s->avctx->width >> (2 - width_shift)) + 7) >> 3;
430
431
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 123 if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable))
432 {
433
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 4 if (compression_types[header.compression].algorithm == ALGO_RGB24H)
434 2 gen_vector_table24(s, sel_vector_table);
435 else
436
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 2 if (s->avctx->pix_fmt == AV_PIX_FMT_RGB555)
437 2 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 */
443 123 s->mb_change_bits = s->buf + header.header_size;
444
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 123 if (s->flags & FLAG_KEYFRAME) {
445 /* no change bits specified for a keyframe; only index bytes */
446 25 s->index_stream = s->mb_change_bits;
447
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 25 if (s->avctx->width * s->avctx->height / 2048 + header.header_size > s->size)
448 ✗ return AVERROR_INVALIDDATA;
449 } else {
450 /* one change bit per 4x4 block */
451 98 s->index_stream = s->mb_change_bits +
452 98 (s->mb_change_bits_row_size * (s->avctx->height >> 2));
453 }
454 123 s->index_stream_size = s->size - (s->index_stream - s->buf);
455
456 123 s->last_deltaset = header.deltaset;
457 123 s->last_vectable = header.vectable;
458 123 s->compression = header.compression;
459 123 s->block_width = compression_types[header.compression].block_width;
460 123 s->block_height = compression_types[header.compression].block_height;
461 123 s->block_type = compression_types[header.compression].block_type;
462
463
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 123 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
464 ✗ av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n",
465 s->last_deltaset, s->last_vectable, s->compression, s->block_width,
466 s->block_height, s->block_type,
467 ✗ s->flags & FLAG_KEYFRAME ? " KEY" : "",
468 ✗ s->flags & FLAG_INTERFRAME ? " INTER" : "",
469 ✗ s->flags & FLAG_SPRITE ? " SPRITE" : "",
470 ✗ s->flags & FLAG_INTERPOLATED ? " INTERPOL" : "");
471
472 123 return header.header_size;
473 }
474
475 4 static av_cold int truemotion1_decode_init(AVCodecContext *avctx)
476 {
477 4 TrueMotion1Context *s = avctx->priv_data;
478
479 4 s->avctx = avctx;
480
481 // FIXME: it may change ?
482 // if (avctx->bits_per_sample == 24)
483 // avctx->pix_fmt = AV_PIX_FMT_RGB24;
484 // else
485 // avctx->pix_fmt = AV_PIX_FMT_RGB555;
486
487 4 s->frame = av_frame_alloc();
488
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 4 if (!s->frame)
489 ✗ return AVERROR(ENOMEM);
490
491 /* there is a vertical predictor for each pixel in a line; each vertical
492 * predictor is 0 to start with */
493 4 av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
494
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 4 if (!s->vert_pred)
495 ✗ return AVERROR(ENOMEM);
496
497 4 return 0;
498 }
499
500 /*
501 Block decoding order:
502
503 dxi: Y-Y
504 dxic: Y-C-Y
505 dxic2: Y-C-Y-C
506
507 hres,vres,i,i%vres (0 < i < 4)
508 2x2 0: 0 dxic2
509 2x2 1: 1 dxi
510 2x2 2: 0 dxic2
511 2x2 3: 1 dxi
512 2x4 0: 0 dxic2
513 2x4 1: 1 dxi
514 2x4 2: 2 dxi
515 2x4 3: 3 dxi
516 4x2 0: 0 dxic
517 4x2 1: 1 dxi
518 4x2 2: 0 dxic
519 4x2 3: 1 dxi
520 4x4 0: 0 dxic
521 4x4 1: 1 dxi
522 4x4 2: 2 dxi
523 4x4 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 \
536 do { \
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
617 97 static 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 97 unsigned char *current_line = s->frame->data[0];
626 97 int keyframe = s->flags & FLAG_KEYFRAME;
627
628 /* these variables are for managing the stream of macroblock change bits */
629 97 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 97 int index_stream_index = 0; /* yes, the index into the index stream */
636 int index;
637
638 /* clean out the line buffer */
639 97 memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
640
641
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 97 GET_NEXT_INDEX();
642
643
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 16393 for (y = 0; y < s->avctx->height; y++) {
644
645 /* re-init variables for the next line iteration */
646 16296 horiz_pred = 0;
647 16296 current_pixel_pair = (unsigned int *)current_line;
648 16296 vert_pred = s->vert_pred;
649 16296 mb_change_index = 0;
650
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 16296 if (!keyframe)
651 12600 mb_change_byte = mb_change_bits[mb_change_index++];
652 16296 mb_change_byte_mask = 0x01;
653 16296 pixels_left = s->avctx->width;
654
655
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 1319976 while (pixels_left > 0) {
656
657
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 1303680 if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
658
659
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 706460 switch (y & 3) {
660 176615 case 0:
661 /* if macroblock width is 2, apply C-Y-C-Y; else
662 * apply C-Y-Y */
663
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 176615 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
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 176615 APPLY_C_PREDICTOR();
672
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 176615 APPLY_Y_PREDICTOR();
673 176615 OUTPUT_PIXEL_PAIR();
674
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 176615 APPLY_Y_PREDICTOR();
675 176615 OUTPUT_PIXEL_PAIR();
676 }
677 176615 break;
678
679 353230 case 1:
680 case 3:
681 /* always apply 2 Y predictors on these iterations */
682
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 353230 APPLY_Y_PREDICTOR();
683 353230 OUTPUT_PIXEL_PAIR();
684
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 353230 APPLY_Y_PREDICTOR();
685 353230 OUTPUT_PIXEL_PAIR();
686 353230 break;
687
688 176615 case 2:
689 /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
690 * depending on the macroblock type */
691
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 176615 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
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 176615 } 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
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 176615 APPLY_Y_PREDICTOR();
706 176615 OUTPUT_PIXEL_PAIR();
707
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 176615 APPLY_Y_PREDICTOR();
708 176615 OUTPUT_PIXEL_PAIR();
709 }
710 176615 break;
711 }
712
713 } else {
714
715 /* skip (copy) four pixels, but reassign the horizontal
716 * predictor */
717 597220 *vert_pred++ = *current_pixel_pair++;
718 597220 horiz_pred = *current_pixel_pair - *vert_pred;
719 597220 *vert_pred++ = *current_pixel_pair++;
720
721 }
722
723
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 1303680 if (!keyframe) {
724 1008000 mb_change_byte_mask <<= 1;
725
726 /* next byte */
727
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 1008000 if (!mb_change_byte_mask) {
728 126000 mb_change_byte = mb_change_bits[mb_change_index++];
729 126000 mb_change_byte_mask = 0x01;
730 }
731 }
732
733 1303680 pixels_left -= 4;
734 }
735
736 /* next change row */
737
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 16296 if (((y + 1) & 3) == 0)
738 4074 mb_change_bits += s->mb_change_bits_row_size;
739
740 16296 current_line += s->frame->linesize[0];
741 }
742 }
743
744 17 static 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 17 unsigned char *current_line = s->frame->data[0];
753 17 int keyframe = s->flags & FLAG_KEYFRAME;
754
755 /* these variables are for managing the stream of macroblock change bits */
756 17 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 17 int index_stream_index = 0; /* yes, the index into the index stream */
763 int index;
764
765 /* clean out the line buffer */
766 17 memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
767
768
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 17 GET_NEXT_INDEX();
769
770
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 2707 for (y = 0; y < s->avctx->height; y++) {
771
772 /* re-init variables for the next line iteration */
773 2691 horiz_pred = 0;
774 2691 current_pixel_pair = (unsigned int *)current_line;
775 2691 vert_pred = s->vert_pred;
776 2691 mb_change_index = 0;
777 2691 mb_change_byte = mb_change_bits[mb_change_index++];
778 2691 mb_change_byte_mask = 0x01;
779 2691 pixels_left = s->avctx->width;
780
781
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 196395 while (pixels_left > 0) {
782
783
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 193705 if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
784
785
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 153710 switch (y & 3) {
786 38453 case 0:
787 /* if macroblock width is 2, apply C-Y-C-Y; else
788 * apply C-Y-Y */
789
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 38453 if (s->block_width == 2) {
790
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 38453 APPLY_C_PREDICTOR_24();
791
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 38453 APPLY_Y_PREDICTOR_24();
792 38453 OUTPUT_PIXEL_PAIR();
793
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 38453 APPLY_C_PREDICTOR_24();
794
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 38453 APPLY_Y_PREDICTOR_24();
795 38453 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 38453 break;
804
805 76846 case 1:
806 case 3:
807 /* always apply 2 Y predictors on these iterations */
808
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 76846 APPLY_Y_PREDICTOR_24();
809 76846 OUTPUT_PIXEL_PAIR();
810
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 76846 APPLY_Y_PREDICTOR_24();
811 76846 OUTPUT_PIXEL_PAIR();
812 76846 break;
813
814 38411 case 2:
815 /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
816 * depending on the macroblock type */
817
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 38411 if (s->block_type == BLOCK_2x2) {
818
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 38411 APPLY_C_PREDICTOR_24();
819
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 38411 APPLY_Y_PREDICTOR_24();
820 38411 OUTPUT_PIXEL_PAIR();
821
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 38411 APPLY_C_PREDICTOR_24();
822
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 38411 APPLY_Y_PREDICTOR_24();
823 38410 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 38410 break;
837 }
838
839 } else {
840
841 /* skip (copy) four pixels, but reassign the horizontal
842 * predictor */
843 39995 *vert_pred++ = *current_pixel_pair++;
844 39995 horiz_pred = *current_pixel_pair - *vert_pred;
845 39995 *vert_pred++ = *current_pixel_pair++;
846
847 }
848
849
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 193704 if (!keyframe) {
850 159144 mb_change_byte_mask <<= 1;
851
852 /* next byte */
853
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 159144 if (!mb_change_byte_mask) {
854 19893 mb_change_byte = mb_change_bits[mb_change_index++];
855 19893 mb_change_byte_mask = 0x01;
856 }
857 }
858
859 193704 pixels_left -= 2;
860 }
861
862 /* next change row */
863
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 2690 if (((y + 1) & 3) == 0)
864 672 mb_change_bits += s->mb_change_bits_row_size;
865
866 2690 current_line += s->frame->linesize[0];
867 }
868 }
869
870
871 123 static int truemotion1_decode_frame(AVCodecContext *avctx,
872 void *data, int *got_frame,
873 AVPacket *avpkt)
874 {
875 123 const uint8_t *buf = avpkt->data;
876 123 int ret, buf_size = avpkt->size;
877 123 TrueMotion1Context *s = avctx->priv_data;
878
879 123 s->buf = buf;
880 123 s->size = buf_size;
881
882
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 123 if ((ret = truemotion1_decode_header(s)) < 0)
883 ✗ return ret;
884
885
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 123 if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
886 ✗ return ret;
887
888
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 123 if (compression_types[s->compression].algorithm == ALGO_RGB24H) {
889 17 truemotion1_decode_24bit(s);
890
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 106 } else if (compression_types[s->compression].algorithm != ALGO_NOP) {
891 97 truemotion1_decode_16bit(s);
892 }
893
894
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 123 if ((ret = av_frame_ref(data, s->frame)) < 0)
895 ✗ return ret;
896
897 123 *got_frame = 1;
898
899 /* report that the buffer was completely consumed */
900 123 return buf_size;
901 }
902
903 4 static av_cold int truemotion1_decode_end(AVCodecContext *avctx)
904 {
905 4 TrueMotion1Context *s = avctx->priv_data;
906
907 4 av_frame_free(&s->frame);
908 4 av_freep(&s->vert_pred);
909
910 4 return 0;
911 }
912
913 const AVCodec 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 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
924 };
925