More cosmetics
[FFMpeg-mirror/DVCPRO-HD.git] / libavcodec / truemotion1.c
blob10b17df601b03e7b14935c8b0f9fe3ff074182b2
1 /*
2 * Duck TrueMotion 1.0 Decoder
3 * Copyright (C) 2003 Alex Beregszaszi & Mike Melanson
5 * This file is part of FFmpeg.
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.
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.
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
22 /**
23 * @file truemotion1.c
24 * Duck TrueMotion v1 Video Decoder by
25 * Alex Beregszaszi and
26 * Mike Melanson (melanson@pcisys.net)
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.
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <string.h>
35 #include <unistd.h>
37 #include "avcodec.h"
38 #include "dsputil.h"
40 #include "truemotion1data.h"
42 typedef struct TrueMotion1Context {
43 AVCodecContext *avctx;
44 AVFrame frame;
46 const uint8_t *buf;
47 int size;
49 const uint8_t *mb_change_bits;
50 int mb_change_bits_row_size;
51 const uint8_t *index_stream;
52 int index_stream_size;
54 int flags;
55 int x, y, w, h;
57 uint32_t y_predictor_table[1024];
58 uint32_t c_predictor_table[1024];
59 uint32_t fat_y_predictor_table[1024];
60 uint32_t fat_c_predictor_table[1024];
62 int compression;
63 int block_type;
64 int block_width;
65 int block_height;
67 int16_t ydt[8];
68 int16_t cdt[8];
69 int16_t fat_ydt[8];
70 int16_t fat_cdt[8];
72 int last_deltaset, last_vectable;
74 unsigned int *vert_pred;
76 } TrueMotion1Context;
78 #define FLAG_SPRITE 32
79 #define FLAG_KEYFRAME 16
80 #define FLAG_INTERFRAME 8
81 #define FLAG_INTERPOLATED 4
83 struct frame_header {
84 uint8_t header_size;
85 uint8_t compression;
86 uint8_t deltaset;
87 uint8_t vectable;
88 uint16_t ysize;
89 uint16_t xsize;
90 uint16_t checksum;
91 uint8_t version;
92 uint8_t header_type;
93 uint8_t flags;
94 uint8_t control;
95 uint16_t xoffset;
96 uint16_t yoffset;
97 uint16_t width;
98 uint16_t height;
101 #define ALGO_NOP 0
102 #define ALGO_RGB16V 1
103 #define ALGO_RGB16H 2
104 #define ALGO_RGB24H 3
106 /* these are the various block sizes that can occupy a 4x4 block */
107 #define BLOCK_2x2 0
108 #define BLOCK_2x4 1
109 #define BLOCK_4x2 2
110 #define BLOCK_4x4 3
112 typedef struct comp_types {
113 int algorithm;
114 int block_width; // vres
115 int block_height; // hres
116 int block_type;
117 } comp_types;
119 /* { valid for metatype }, algorithm, num of deltas, vert res, horiz res */
120 static const comp_types compression_types[17] = {
121 { ALGO_NOP, 0, 0, 0 },
123 { ALGO_RGB16V, 4, 4, BLOCK_4x4 },
124 { ALGO_RGB16H, 4, 4, BLOCK_4x4 },
125 { ALGO_RGB16V, 4, 2, BLOCK_4x2 },
126 { ALGO_RGB16H, 4, 2, BLOCK_4x2 },
128 { ALGO_RGB16V, 2, 4, BLOCK_2x4 },
129 { ALGO_RGB16H, 2, 4, BLOCK_2x4 },
130 { ALGO_RGB16V, 2, 2, BLOCK_2x2 },
131 { ALGO_RGB16H, 2, 2, BLOCK_2x2 },
133 { ALGO_NOP, 4, 4, BLOCK_4x4 },
134 { ALGO_RGB24H, 4, 4, BLOCK_4x4 },
135 { ALGO_NOP, 4, 2, BLOCK_4x2 },
136 { ALGO_RGB24H, 4, 2, BLOCK_4x2 },
138 { ALGO_NOP, 2, 4, BLOCK_2x4 },
139 { ALGO_RGB24H, 2, 4, BLOCK_2x4 },
140 { ALGO_NOP, 2, 2, BLOCK_2x2 },
141 { ALGO_RGB24H, 2, 2, BLOCK_2x2 }
144 static void select_delta_tables(TrueMotion1Context *s, int delta_table_index)
146 int i;
148 if (delta_table_index > 3)
149 return;
151 memcpy(s->ydt, ydts[delta_table_index], 8 * sizeof(int16_t));
152 memcpy(s->cdt, cdts[delta_table_index], 8 * sizeof(int16_t));
153 memcpy(s->fat_ydt, fat_ydts[delta_table_index], 8 * sizeof(int16_t));
154 memcpy(s->fat_cdt, fat_cdts[delta_table_index], 8 * sizeof(int16_t));
156 /* Y skinny deltas need to be halved for some reason; maybe the
157 * skinny Y deltas should be modified */
158 for (i = 0; i < 8; i++)
160 /* drop the lsb before dividing by 2-- net effect: round down
161 * when dividing a negative number (e.g., -3/2 = -2, not -1) */
162 s->ydt[i] &= 0xFFFE;
163 s->ydt[i] /= 2;
167 #ifdef WORDS_BIGENDIAN
168 static int make_ydt15_entry(int p2, int p1, int16_t *ydt)
169 #else
170 static int make_ydt15_entry(int p1, int p2, int16_t *ydt)
171 #endif
173 int lo, hi;
175 lo = ydt[p1];
176 lo += (lo << 5) + (lo << 10);
177 hi = ydt[p2];
178 hi += (hi << 5) + (hi << 10);
179 return (lo + (hi << 16)) << 1;
182 #ifdef WORDS_BIGENDIAN
183 static int make_cdt15_entry(int p2, int p1, int16_t *cdt)
184 #else
185 static int make_cdt15_entry(int p1, int p2, int16_t *cdt)
186 #endif
188 int r, b, lo;
190 b = cdt[p2];
191 r = cdt[p1] << 10;
192 lo = b + r;
193 return (lo + (lo << 16)) << 1;
196 #ifdef WORDS_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
202 int lo, hi;
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;
211 #ifdef WORDS_BIGENDIAN
212 static int make_cdt16_entry(int p2, int p1, int16_t *cdt)
213 #else
214 static int make_cdt16_entry(int p1, int p2, int16_t *cdt)
215 #endif
217 int r, b, lo;
219 b = cdt[p2];
220 r = cdt[p1] << 11;
221 lo = b + r;
222 return (lo + (lo << 16)) << 1;
225 #ifdef WORDS_BIGENDIAN
226 static int make_ydt24_entry(int p2, int p1, int16_t *ydt)
227 #else
228 static int make_ydt24_entry(int p1, int p2, int16_t *ydt)
229 #endif
231 int lo, hi;
233 lo = ydt[p1];
234 hi = ydt[p2];
235 return (lo + (hi << 8) + (hi << 16)) << 1;
238 #ifdef WORDS_BIGENDIAN
239 static int make_cdt24_entry(int p2, int p1, int16_t *cdt)
240 #else
241 static int make_cdt24_entry(int p1, int p2, int16_t *cdt)
242 #endif
244 int r, b;
246 b = cdt[p2];
247 r = cdt[p1]<<16;
248 return (b+r) << 1;
251 static void gen_vector_table15(TrueMotion1Context *s, const uint8_t *sel_vector_table)
253 int len, i, j;
254 unsigned char delta_pair;
256 for (i = 0; i < 1024; i += 4)
258 len = *sel_vector_table++ / 2;
259 for (j = 0; j < len; j++)
261 delta_pair = *sel_vector_table++;
262 s->y_predictor_table[i+j] = 0xfffffffe &
263 make_ydt15_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
264 s->c_predictor_table[i+j] = 0xfffffffe &
265 make_cdt15_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
267 s->y_predictor_table[i+(j-1)] |= 1;
268 s->c_predictor_table[i+(j-1)] |= 1;
272 static void gen_vector_table16(TrueMotion1Context *s, const uint8_t *sel_vector_table)
274 int len, i, j;
275 unsigned char delta_pair;
277 for (i = 0; i < 1024; i += 4)
279 len = *sel_vector_table++ / 2;
280 for (j = 0; j < len; j++)
282 delta_pair = *sel_vector_table++;
283 s->y_predictor_table[i+j] = 0xfffffffe &
284 make_ydt16_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
285 s->c_predictor_table[i+j] = 0xfffffffe &
286 make_cdt16_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
288 s->y_predictor_table[i+(j-1)] |= 1;
289 s->c_predictor_table[i+(j-1)] |= 1;
293 static void gen_vector_table24(TrueMotion1Context *s, const uint8_t *sel_vector_table)
295 int len, i, j;
296 unsigned char delta_pair;
298 for (i = 0; i < 1024; i += 4)
300 len = *sel_vector_table++ / 2;
301 for (j = 0; j < len; j++)
303 delta_pair = *sel_vector_table++;
304 s->y_predictor_table[i+j] = 0xfffffffe &
305 make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
306 s->c_predictor_table[i+j] = 0xfffffffe &
307 make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
308 s->fat_y_predictor_table[i+j] = 0xfffffffe &
309 make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_ydt);
310 s->fat_c_predictor_table[i+j] = 0xfffffffe &
311 make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_cdt);
313 s->y_predictor_table[i+(j-1)] |= 1;
314 s->c_predictor_table[i+(j-1)] |= 1;
315 s->fat_y_predictor_table[i+(j-1)] |= 1;
316 s->fat_c_predictor_table[i+(j-1)] |= 1;
320 /* Returns the number of bytes consumed from the bytestream. Returns -1 if
321 * there was an error while decoding the header */
322 static int truemotion1_decode_header(TrueMotion1Context *s)
324 int i;
325 struct frame_header header;
326 uint8_t header_buffer[128]; /* logical maximum size of the header */
327 const uint8_t *sel_vector_table;
329 /* There is 1 change bit per 4 pixels, so each change byte represents
330 * 32 pixels; divide width by 4 to obtain the number of change bits and
331 * then round up to the nearest byte. */
332 s->mb_change_bits_row_size = ((s->avctx->width >> 2) + 7) >> 3;
334 header.header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f;
335 if (s->buf[0] < 0x10)
337 av_log(s->avctx, AV_LOG_ERROR, "invalid header size (%d)\n", s->buf[0]);
338 return -1;
341 /* unscramble the header bytes with a XOR operation */
342 memset(header_buffer, 0, 128);
343 for (i = 1; i < header.header_size; i++)
344 header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1];
346 header.compression = header_buffer[0];
347 header.deltaset = header_buffer[1];
348 header.vectable = header_buffer[2];
349 header.ysize = AV_RL16(&header_buffer[3]);
350 header.xsize = AV_RL16(&header_buffer[5]);
351 header.checksum = AV_RL16(&header_buffer[7]);
352 header.version = header_buffer[9];
353 header.header_type = header_buffer[10];
354 header.flags = header_buffer[11];
355 header.control = header_buffer[12];
357 /* Version 2 */
358 if (header.version >= 2)
360 if (header.header_type > 3)
362 av_log(s->avctx, AV_LOG_ERROR, "invalid header type (%d)\n", header.header_type);
363 return -1;
364 } else if ((header.header_type == 2) || (header.header_type == 3)) {
365 s->flags = header.flags;
366 if (!(s->flags & FLAG_INTERFRAME))
367 s->flags |= FLAG_KEYFRAME;
368 } else
369 s->flags = FLAG_KEYFRAME;
370 } else /* Version 1 */
371 s->flags = FLAG_KEYFRAME;
373 if (s->flags & FLAG_SPRITE) {
374 av_log(s->avctx, AV_LOG_INFO, "SPRITE frame found, please report the sample to the developers\n");
375 /* FIXME header.width, height, xoffset and yoffset aren't initialized */
376 #if 0
377 s->w = header.width;
378 s->h = header.height;
379 s->x = header.xoffset;
380 s->y = header.yoffset;
381 #else
382 return -1;
383 #endif
384 } else {
385 s->w = header.xsize;
386 s->h = header.ysize;
387 if (header.header_type < 2) {
388 if ((s->w < 213) && (s->h >= 176))
390 s->flags |= FLAG_INTERPOLATED;
391 av_log(s->avctx, AV_LOG_INFO, "INTERPOLATION selected, please report the sample to the developers\n");
396 if (header.compression >= 17) {
397 av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression);
398 return -1;
401 if ((header.deltaset != s->last_deltaset) ||
402 (header.vectable != s->last_vectable))
403 select_delta_tables(s, header.deltaset);
405 if ((header.compression & 1) && header.header_type)
406 sel_vector_table = pc_tbl2;
407 else {
408 if (header.vectable < 4)
409 sel_vector_table = tables[header.vectable - 1];
410 else {
411 av_log(s->avctx, AV_LOG_ERROR, "invalid vector table id (%d)\n", header.vectable);
412 return -1;
416 // FIXME: where to place this ?!?!
417 if (compression_types[header.compression].algorithm == ALGO_RGB24H)
418 s->avctx->pix_fmt = PIX_FMT_RGB32;
419 else
420 s->avctx->pix_fmt = PIX_FMT_RGB555; // RGB565 is supported as well
422 if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable))
424 if (compression_types[header.compression].algorithm == ALGO_RGB24H)
425 gen_vector_table24(s, sel_vector_table);
426 else
427 if (s->avctx->pix_fmt == PIX_FMT_RGB555)
428 gen_vector_table15(s, sel_vector_table);
429 else
430 gen_vector_table16(s, sel_vector_table);
433 /* set up pointers to the other key data chunks */
434 s->mb_change_bits = s->buf + header.header_size;
435 if (s->flags & FLAG_KEYFRAME) {
436 /* no change bits specified for a keyframe; only index bytes */
437 s->index_stream = s->mb_change_bits;
438 } else {
439 /* one change bit per 4x4 block */
440 s->index_stream = s->mb_change_bits +
441 (s->mb_change_bits_row_size * (s->avctx->height >> 2));
443 s->index_stream_size = s->size - (s->index_stream - s->buf);
445 s->last_deltaset = header.deltaset;
446 s->last_vectable = header.vectable;
447 s->compression = header.compression;
448 s->block_width = compression_types[header.compression].block_width;
449 s->block_height = compression_types[header.compression].block_height;
450 s->block_type = compression_types[header.compression].block_type;
452 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
453 av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n",
454 s->last_deltaset, s->last_vectable, s->compression, s->block_width,
455 s->block_height, s->block_type,
456 s->flags & FLAG_KEYFRAME ? " KEY" : "",
457 s->flags & FLAG_INTERFRAME ? " INTER" : "",
458 s->flags & FLAG_SPRITE ? " SPRITE" : "",
459 s->flags & FLAG_INTERPOLATED ? " INTERPOL" : "");
461 return header.header_size;
464 static av_cold int truemotion1_decode_init(AVCodecContext *avctx)
466 TrueMotion1Context *s = avctx->priv_data;
468 s->avctx = avctx;
470 // FIXME: it may change ?
471 // if (avctx->bits_per_sample == 24)
472 // avctx->pix_fmt = PIX_FMT_RGB24;
473 // else
474 // avctx->pix_fmt = PIX_FMT_RGB555;
476 s->frame.data[0] = NULL;
478 /* there is a vertical predictor for each pixel in a line; each vertical
479 * predictor is 0 to start with */
480 s->vert_pred =
481 (unsigned int *)av_malloc(s->avctx->width * sizeof(unsigned int));
483 return 0;
487 Block decoding order:
489 dxi: Y-Y
490 dxic: Y-C-Y
491 dxic2: Y-C-Y-C
493 hres,vres,i,i%vres (0 < i < 4)
494 2x2 0: 0 dxic2
495 2x2 1: 1 dxi
496 2x2 2: 0 dxic2
497 2x2 3: 1 dxi
498 2x4 0: 0 dxic2
499 2x4 1: 1 dxi
500 2x4 2: 2 dxi
501 2x4 3: 3 dxi
502 4x2 0: 0 dxic
503 4x2 1: 1 dxi
504 4x2 2: 0 dxic
505 4x2 3: 1 dxi
506 4x4 0: 0 dxic
507 4x4 1: 1 dxi
508 4x4 2: 2 dxi
509 4x4 3: 3 dxi
512 #define GET_NEXT_INDEX() \
514 if (index_stream_index >= s->index_stream_size) { \
515 av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \
516 return; \
518 index = s->index_stream[index_stream_index++] * 4; \
521 #define APPLY_C_PREDICTOR() \
522 predictor_pair = s->c_predictor_table[index]; \
523 horiz_pred += (predictor_pair >> 1); \
524 if (predictor_pair & 1) { \
525 GET_NEXT_INDEX() \
526 if (!index) { \
527 GET_NEXT_INDEX() \
528 predictor_pair = s->c_predictor_table[index]; \
529 horiz_pred += ((predictor_pair >> 1) * 5); \
530 if (predictor_pair & 1) \
531 GET_NEXT_INDEX() \
532 else \
533 index++; \
535 } else \
536 index++;
538 #define APPLY_C_PREDICTOR_24() \
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->fat_c_predictor_table[index]; \
546 horiz_pred += (predictor_pair >> 1); \
547 if (predictor_pair & 1) \
548 GET_NEXT_INDEX() \
549 else \
550 index++; \
552 } else \
553 index++;
556 #define APPLY_Y_PREDICTOR() \
557 predictor_pair = s->y_predictor_table[index]; \
558 horiz_pred += (predictor_pair >> 1); \
559 if (predictor_pair & 1) { \
560 GET_NEXT_INDEX() \
561 if (!index) { \
562 GET_NEXT_INDEX() \
563 predictor_pair = s->y_predictor_table[index]; \
564 horiz_pred += ((predictor_pair >> 1) * 5); \
565 if (predictor_pair & 1) \
566 GET_NEXT_INDEX() \
567 else \
568 index++; \
570 } else \
571 index++;
573 #define APPLY_Y_PREDICTOR_24() \
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->fat_y_predictor_table[index]; \
581 horiz_pred += (predictor_pair >> 1); \
582 if (predictor_pair & 1) \
583 GET_NEXT_INDEX() \
584 else \
585 index++; \
587 } else \
588 index++;
590 #define OUTPUT_PIXEL_PAIR() \
591 *current_pixel_pair = *vert_pred + horiz_pred; \
592 *vert_pred++ = *current_pixel_pair++;
594 static void truemotion1_decode_16bit(TrueMotion1Context *s)
596 int y;
597 int pixels_left; /* remaining pixels on this line */
598 unsigned int predictor_pair;
599 unsigned int horiz_pred;
600 unsigned int *vert_pred;
601 unsigned int *current_pixel_pair;
602 unsigned char *current_line = s->frame.data[0];
603 int keyframe = s->flags & FLAG_KEYFRAME;
605 /* these variables are for managing the stream of macroblock change bits */
606 const unsigned char *mb_change_bits = s->mb_change_bits;
607 unsigned char mb_change_byte;
608 unsigned char mb_change_byte_mask;
609 int mb_change_index;
611 /* these variables are for managing the main index stream */
612 int index_stream_index = 0; /* yes, the index into the index stream */
613 int index;
615 /* clean out the line buffer */
616 memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
618 GET_NEXT_INDEX();
620 for (y = 0; y < s->avctx->height; y++) {
622 /* re-init variables for the next line iteration */
623 horiz_pred = 0;
624 current_pixel_pair = (unsigned int *)current_line;
625 vert_pred = s->vert_pred;
626 mb_change_index = 0;
627 mb_change_byte = mb_change_bits[mb_change_index++];
628 mb_change_byte_mask = 0x01;
629 pixels_left = s->avctx->width;
631 while (pixels_left > 0) {
633 if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
635 switch (y & 3) {
636 case 0:
637 /* if macroblock width is 2, apply C-Y-C-Y; else
638 * apply C-Y-Y */
639 if (s->block_width == 2) {
640 APPLY_C_PREDICTOR();
641 APPLY_Y_PREDICTOR();
642 OUTPUT_PIXEL_PAIR();
643 APPLY_C_PREDICTOR();
644 APPLY_Y_PREDICTOR();
645 OUTPUT_PIXEL_PAIR();
646 } else {
647 APPLY_C_PREDICTOR();
648 APPLY_Y_PREDICTOR();
649 OUTPUT_PIXEL_PAIR();
650 APPLY_Y_PREDICTOR();
651 OUTPUT_PIXEL_PAIR();
653 break;
655 case 1:
656 case 3:
657 /* always apply 2 Y predictors on these iterations */
658 APPLY_Y_PREDICTOR();
659 OUTPUT_PIXEL_PAIR();
660 APPLY_Y_PREDICTOR();
661 OUTPUT_PIXEL_PAIR();
662 break;
664 case 2:
665 /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
666 * depending on the macroblock type */
667 if (s->block_type == BLOCK_2x2) {
668 APPLY_C_PREDICTOR();
669 APPLY_Y_PREDICTOR();
670 OUTPUT_PIXEL_PAIR();
671 APPLY_C_PREDICTOR();
672 APPLY_Y_PREDICTOR();
673 OUTPUT_PIXEL_PAIR();
674 } else if (s->block_type == BLOCK_4x2) {
675 APPLY_C_PREDICTOR();
676 APPLY_Y_PREDICTOR();
677 OUTPUT_PIXEL_PAIR();
678 APPLY_Y_PREDICTOR();
679 OUTPUT_PIXEL_PAIR();
680 } else {
681 APPLY_Y_PREDICTOR();
682 OUTPUT_PIXEL_PAIR();
683 APPLY_Y_PREDICTOR();
684 OUTPUT_PIXEL_PAIR();
686 break;
689 } else {
691 /* skip (copy) four pixels, but reassign the horizontal
692 * predictor */
693 *vert_pred++ = *current_pixel_pair++;
694 horiz_pred = *current_pixel_pair - *vert_pred;
695 *vert_pred++ = *current_pixel_pair++;
699 if (!keyframe) {
700 mb_change_byte_mask <<= 1;
702 /* next byte */
703 if (!mb_change_byte_mask) {
704 mb_change_byte = mb_change_bits[mb_change_index++];
705 mb_change_byte_mask = 0x01;
709 pixels_left -= 4;
712 /* next change row */
713 if (((y + 1) & 3) == 0)
714 mb_change_bits += s->mb_change_bits_row_size;
716 current_line += s->frame.linesize[0];
720 static void truemotion1_decode_24bit(TrueMotion1Context *s)
722 int y;
723 int pixels_left; /* remaining pixels on this line */
724 unsigned int predictor_pair;
725 unsigned int horiz_pred;
726 unsigned int *vert_pred;
727 unsigned int *current_pixel_pair;
728 unsigned char *current_line = s->frame.data[0];
729 int keyframe = s->flags & FLAG_KEYFRAME;
731 /* these variables are for managing the stream of macroblock change bits */
732 const unsigned char *mb_change_bits = s->mb_change_bits;
733 unsigned char mb_change_byte;
734 unsigned char mb_change_byte_mask;
735 int mb_change_index;
737 /* these variables are for managing the main index stream */
738 int index_stream_index = 0; /* yes, the index into the index stream */
739 int index;
741 /* clean out the line buffer */
742 memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
744 GET_NEXT_INDEX();
746 for (y = 0; y < s->avctx->height; y++) {
748 /* re-init variables for the next line iteration */
749 horiz_pred = 0;
750 current_pixel_pair = (unsigned int *)current_line;
751 vert_pred = s->vert_pred;
752 mb_change_index = 0;
753 mb_change_byte = mb_change_bits[mb_change_index++];
754 mb_change_byte_mask = 0x01;
755 pixels_left = s->avctx->width;
757 while (pixels_left > 0) {
759 if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
761 switch (y & 3) {
762 case 0:
763 /* if macroblock width is 2, apply C-Y-C-Y; else
764 * apply C-Y-Y */
765 if (s->block_width == 2) {
766 APPLY_C_PREDICTOR_24();
767 APPLY_Y_PREDICTOR_24();
768 OUTPUT_PIXEL_PAIR();
769 APPLY_C_PREDICTOR_24();
770 APPLY_Y_PREDICTOR_24();
771 OUTPUT_PIXEL_PAIR();
772 } else {
773 APPLY_C_PREDICTOR_24();
774 APPLY_Y_PREDICTOR_24();
775 OUTPUT_PIXEL_PAIR();
776 APPLY_Y_PREDICTOR_24();
777 OUTPUT_PIXEL_PAIR();
779 break;
781 case 1:
782 case 3:
783 /* always apply 2 Y predictors on these iterations */
784 APPLY_Y_PREDICTOR_24();
785 OUTPUT_PIXEL_PAIR();
786 APPLY_Y_PREDICTOR_24();
787 OUTPUT_PIXEL_PAIR();
788 break;
790 case 2:
791 /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
792 * depending on the macroblock type */
793 if (s->block_type == BLOCK_2x2) {
794 APPLY_C_PREDICTOR_24();
795 APPLY_Y_PREDICTOR_24();
796 OUTPUT_PIXEL_PAIR();
797 APPLY_C_PREDICTOR_24();
798 APPLY_Y_PREDICTOR_24();
799 OUTPUT_PIXEL_PAIR();
800 } else if (s->block_type == BLOCK_4x2) {
801 APPLY_C_PREDICTOR_24();
802 APPLY_Y_PREDICTOR_24();
803 OUTPUT_PIXEL_PAIR();
804 APPLY_Y_PREDICTOR_24();
805 OUTPUT_PIXEL_PAIR();
806 } else {
807 APPLY_Y_PREDICTOR_24();
808 OUTPUT_PIXEL_PAIR();
809 APPLY_Y_PREDICTOR_24();
810 OUTPUT_PIXEL_PAIR();
812 break;
815 } else {
817 /* skip (copy) four pixels, but reassign the horizontal
818 * predictor */
819 *vert_pred++ = *current_pixel_pair++;
820 horiz_pred = *current_pixel_pair - *vert_pred;
821 *vert_pred++ = *current_pixel_pair++;
825 if (!keyframe) {
826 mb_change_byte_mask <<= 1;
828 /* next byte */
829 if (!mb_change_byte_mask) {
830 mb_change_byte = mb_change_bits[mb_change_index++];
831 mb_change_byte_mask = 0x01;
835 pixels_left -= 4;
838 /* next change row */
839 if (((y + 1) & 3) == 0)
840 mb_change_bits += s->mb_change_bits_row_size;
842 current_line += s->frame.linesize[0];
847 static int truemotion1_decode_frame(AVCodecContext *avctx,
848 void *data, int *data_size,
849 const uint8_t *buf, int buf_size)
851 TrueMotion1Context *s = avctx->priv_data;
853 s->buf = buf;
854 s->size = buf_size;
856 if (truemotion1_decode_header(s) == -1)
857 return -1;
859 s->frame.reference = 1;
860 s->frame.buffer_hints = FF_BUFFER_HINTS_VALID |
861 FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
862 if (avctx->reget_buffer(avctx, &s->frame) < 0) {
863 av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
864 return -1;
867 if (compression_types[s->compression].algorithm == ALGO_RGB24H) {
868 truemotion1_decode_24bit(s);
869 } else if (compression_types[s->compression].algorithm != ALGO_NOP) {
870 truemotion1_decode_16bit(s);
873 *data_size = sizeof(AVFrame);
874 *(AVFrame*)data = s->frame;
876 /* report that the buffer was completely consumed */
877 return buf_size;
880 static av_cold int truemotion1_decode_end(AVCodecContext *avctx)
882 TrueMotion1Context *s = avctx->priv_data;
884 if (s->frame.data[0])
885 avctx->release_buffer(avctx, &s->frame);
887 av_free(s->vert_pred);
889 return 0;
892 AVCodec truemotion1_decoder = {
893 "truemotion1",
894 CODEC_TYPE_VIDEO,
895 CODEC_ID_TRUEMOTION1,
896 sizeof(TrueMotion1Context),
897 truemotion1_decode_init,
898 NULL,
899 truemotion1_decode_end,
900 truemotion1_decode_frame,
901 CODEC_CAP_DR1,
902 .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 1.0"),