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
24 * Duck TrueMotion v1 Video Decoder by
25 * Alex Beregszaszi (alex@fsn.hu) 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.
41 #include "truemotion1data.h"
43 typedef struct TrueMotion1Context {
44 AVCodecContext *avctx;
51 uint8_t *mb_change_bits;
52 int mb_change_bits_row_size;
53 uint8_t *index_stream;
54 int index_stream_size;
59 uint32_t y_predictor_table[1024];
60 uint32_t c_predictor_table[1024];
61 uint32_t fat_y_predictor_table[1024];
62 uint32_t fat_c_predictor_table[1024];
74 int last_deltaset, last_vectable;
76 unsigned int *vert_pred;
80 #define FLAG_SPRITE 32
81 #define FLAG_KEYFRAME 16
82 #define FLAG_INTERFRAME 8
83 #define FLAG_INTERPOLATED 4
104 #define ALGO_RGB16V 1
105 #define ALGO_RGB16H 2
106 #define ALGO_RGB24H 3
108 /* these are the various block sizes that can occupy a 4x4 block */
114 typedef struct comp_types {
116 int block_width; // vres
117 int block_height; // hres
121 /* { valid for metatype }, algorithm, num of deltas, vert res, horiz res */
122 static comp_types compression_types[17] = {
123 { ALGO_NOP, 0, 0, 0 },
125 { ALGO_RGB16V, 4, 4, BLOCK_4x4 },
126 { ALGO_RGB16H, 4, 4, BLOCK_4x4 },
127 { ALGO_RGB16V, 4, 2, BLOCK_4x2 },
128 { ALGO_RGB16H, 4, 2, BLOCK_4x2 },
130 { ALGO_RGB16V, 2, 4, BLOCK_2x4 },
131 { ALGO_RGB16H, 2, 4, BLOCK_2x4 },
132 { ALGO_RGB16V, 2, 2, BLOCK_2x2 },
133 { ALGO_RGB16H, 2, 2, BLOCK_2x2 },
135 { ALGO_NOP, 4, 4, BLOCK_4x4 },
136 { ALGO_RGB24H, 4, 4, BLOCK_4x4 },
137 { ALGO_NOP, 4, 2, BLOCK_4x2 },
138 { ALGO_RGB24H, 4, 2, BLOCK_4x2 },
140 { ALGO_NOP, 2, 4, BLOCK_2x4 },
141 { ALGO_RGB24H, 2, 4, BLOCK_2x4 },
142 { ALGO_NOP, 2, 2, BLOCK_2x2 },
143 { ALGO_RGB24H, 2, 2, BLOCK_2x2 }
146 static void select_delta_tables(TrueMotion1Context *s, int delta_table_index)
150 if (delta_table_index > 3)
153 memcpy(s->ydt, ydts[delta_table_index], 8 * sizeof(int16_t));
154 memcpy(s->cdt, cdts[delta_table_index], 8 * sizeof(int16_t));
155 memcpy(s->fat_ydt, fat_ydts[delta_table_index], 8 * sizeof(int16_t));
156 memcpy(s->fat_cdt, fat_cdts[delta_table_index], 8 * sizeof(int16_t));
158 /* Y skinny deltas need to be halved for some reason; maybe the
159 * skinny Y deltas should be modified */
160 for (i = 0; i < 8; i++)
162 /* drop the lsb before dividing by 2-- net effect: round down
163 * when dividing a negative number (e.g., -3/2 = -2, not -1) */
169 #ifdef WORDS_BIGENDIAN
170 static int make_ydt15_entry(int p2, int p1, int16_t *ydt)
172 static int make_ydt15_entry(int p1, int p2, int16_t *ydt)
178 lo += (lo << 5) + (lo << 10);
180 hi += (hi << 5) + (hi << 10);
181 return ((lo + (hi << 16)) << 1);
184 #ifdef WORDS_BIGENDIAN
185 static int make_cdt15_entry(int p2, int p1, int16_t *cdt)
187 static int make_cdt15_entry(int p1, int p2, int16_t *cdt)
195 return ((lo + (lo << 16)) << 1);
198 #ifdef WORDS_BIGENDIAN
199 static int make_ydt16_entry(int p2, int p1, int16_t *ydt)
201 static int make_ydt16_entry(int p1, int p2, int16_t *ydt)
207 lo += (lo << 6) + (lo << 11);
209 hi += (hi << 6) + (hi << 11);
210 return ((lo + (hi << 16)) << 1);
213 #ifdef WORDS_BIGENDIAN
214 static int make_cdt16_entry(int p2, int p1, int16_t *cdt)
216 static int make_cdt16_entry(int p1, int p2, int16_t *cdt)
224 return ((lo + (lo << 16)) << 1);
227 #ifdef WORDS_BIGENDIAN
228 static int make_ydt24_entry(int p2, int p1, int16_t *ydt)
230 static int make_ydt24_entry(int p1, int p2, int16_t *ydt)
237 return ((lo + (hi << 8) + (hi << 16)) << 1);
240 #ifdef WORDS_BIGENDIAN
241 static int make_cdt24_entry(int p2, int p1, int16_t *cdt)
243 static int make_cdt24_entry(int p1, int p2, int16_t *cdt)
253 static void gen_vector_table15(TrueMotion1Context *s, const uint8_t *sel_vector_table)
256 unsigned char delta_pair;
258 for (i = 0; i < 1024; i += 4)
260 len = *sel_vector_table++ / 2;
261 for (j = 0; j < len; j++)
263 delta_pair = *sel_vector_table++;
264 s->y_predictor_table[i+j] = 0xfffffffe &
265 make_ydt15_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
266 s->c_predictor_table[i+j] = 0xfffffffe &
267 make_cdt15_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
269 s->y_predictor_table[i+(j-1)] |= 1;
270 s->c_predictor_table[i+(j-1)] |= 1;
274 static void gen_vector_table16(TrueMotion1Context *s, const uint8_t *sel_vector_table)
277 unsigned char delta_pair;
279 for (i = 0; i < 1024; i += 4)
281 len = *sel_vector_table++ / 2;
282 for (j = 0; j < len; j++)
284 delta_pair = *sel_vector_table++;
285 s->y_predictor_table[i+j] = 0xfffffffe &
286 make_ydt16_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
287 s->c_predictor_table[i+j] = 0xfffffffe &
288 make_cdt16_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
290 s->y_predictor_table[i+(j-1)] |= 1;
291 s->c_predictor_table[i+(j-1)] |= 1;
295 static void gen_vector_table24(TrueMotion1Context *s, const uint8_t *sel_vector_table)
298 unsigned char delta_pair;
300 for (i = 0; i < 1024; i += 4)
302 len = *sel_vector_table++ / 2;
303 for (j = 0; j < len; j++)
305 delta_pair = *sel_vector_table++;
306 s->y_predictor_table[i+j] = 0xfffffffe &
307 make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
308 s->c_predictor_table[i+j] = 0xfffffffe &
309 make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
310 s->fat_y_predictor_table[i+j] = 0xfffffffe &
311 make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_ydt);
312 s->fat_c_predictor_table[i+j] = 0xfffffffe &
313 make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_cdt);
315 s->y_predictor_table[i+(j-1)] |= 1;
316 s->c_predictor_table[i+(j-1)] |= 1;
317 s->fat_y_predictor_table[i+(j-1)] |= 1;
318 s->fat_c_predictor_table[i+(j-1)] |= 1;
322 /* Returns the number of bytes consumed from the bytestream. Returns -1 if
323 * there was an error while decoding the header */
324 static int truemotion1_decode_header(TrueMotion1Context *s)
327 struct frame_header header;
328 uint8_t header_buffer[128]; /* logical maximum size of the header */
329 const uint8_t *sel_vector_table;
331 /* There is 1 change bit per 4 pixels, so each change byte represents
332 * 32 pixels; divide width by 4 to obtain the number of change bits and
333 * then round up to the nearest byte. */
334 s->mb_change_bits_row_size = ((s->avctx->width >> 2) + 7) >> 3;
336 header.header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f;
337 if (s->buf[0] < 0x10)
339 av_log(s->avctx, AV_LOG_ERROR, "invalid header size (%d)\n", s->buf[0]);
343 /* unscramble the header bytes with a XOR operation */
344 memset(header_buffer, 0, 128);
345 for (i = 1; i < header.header_size; i++)
346 header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1];
348 header.compression = header_buffer[0];
349 header.deltaset = header_buffer[1];
350 header.vectable = header_buffer[2];
351 header.ysize = LE_16(&header_buffer[3]);
352 header.xsize = LE_16(&header_buffer[5]);
353 header.checksum = LE_16(&header_buffer[7]);
354 header.version = header_buffer[9];
355 header.header_type = header_buffer[10];
356 header.flags = header_buffer[11];
357 header.control = header_buffer[12];
360 if (header.version >= 2)
362 if (header.header_type > 3)
364 av_log(s->avctx, AV_LOG_ERROR, "invalid header type (%d)\n", header.header_type);
366 } else if ((header.header_type == 2) || (header.header_type == 3)) {
367 s->flags = header.flags;
368 if (!(s->flags & FLAG_INTERFRAME))
369 s->flags |= FLAG_KEYFRAME;
371 s->flags = FLAG_KEYFRAME;
372 } else /* Version 1 */
373 s->flags = FLAG_KEYFRAME;
375 if (s->flags & FLAG_SPRITE) {
376 av_log(s->avctx, AV_LOG_INFO, "SPRITE frame found, please report the sample to the developers\n");
378 s->h = header.height;
379 s->x = header.xoffset;
380 s->y = header.yoffset;
384 if (header.header_type < 2) {
385 if ((s->w < 213) && (s->h >= 176))
387 s->flags |= FLAG_INTERPOLATED;
388 av_log(s->avctx, AV_LOG_INFO, "INTERPOLATION selected, please report the sample to the developers\n");
393 if (header.compression > 17) {
394 av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression);
398 if ((header.deltaset != s->last_deltaset) ||
399 (header.vectable != s->last_vectable))
400 select_delta_tables(s, header.deltaset);
402 if ((header.compression & 1) && header.header_type)
403 sel_vector_table = pc_tbl2;
405 if (header.vectable < 4)
406 sel_vector_table = tables[header.vectable - 1];
408 av_log(s->avctx, AV_LOG_ERROR, "invalid vector table id (%d)\n", header.vectable);
413 // FIXME: where to place this ?!?!
414 if (compression_types[header.compression].algorithm == ALGO_RGB24H)
415 s->avctx->pix_fmt = PIX_FMT_RGBA32;
417 s->avctx->pix_fmt = PIX_FMT_RGB555; // RGB565 is supported aswell
419 if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable))
421 if (compression_types[header.compression].algorithm == ALGO_RGB24H)
422 gen_vector_table24(s, sel_vector_table);
424 if (s->avctx->pix_fmt == PIX_FMT_RGB555)
425 gen_vector_table15(s, sel_vector_table);
427 gen_vector_table16(s, sel_vector_table);
430 /* set up pointers to the other key data chunks */
431 s->mb_change_bits = s->buf + header.header_size;
432 if (s->flags & FLAG_KEYFRAME) {
433 /* no change bits specified for a keyframe; only index bytes */
434 s->index_stream = s->mb_change_bits;
436 /* one change bit per 4x4 block */
437 s->index_stream = s->mb_change_bits +
438 (s->mb_change_bits_row_size * (s->avctx->height >> 2));
440 s->index_stream_size = s->size - (s->index_stream - s->buf);
442 s->last_deltaset = header.deltaset;
443 s->last_vectable = header.vectable;
444 s->compression = header.compression;
445 s->block_width = compression_types[header.compression].block_width;
446 s->block_height = compression_types[header.compression].block_height;
447 s->block_type = compression_types[header.compression].block_type;
449 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
450 av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n",
451 s->last_deltaset, s->last_vectable, s->compression, s->block_width,
452 s->block_height, s->block_type,
453 s->flags & FLAG_KEYFRAME ? " KEY" : "",
454 s->flags & FLAG_INTERFRAME ? " INTER" : "",
455 s->flags & FLAG_SPRITE ? " SPRITE" : "",
456 s->flags & FLAG_INTERPOLATED ? " INTERPOL" : "");
458 return header.header_size;
461 static int truemotion1_decode_init(AVCodecContext *avctx)
463 TrueMotion1Context *s = (TrueMotion1Context *)avctx->priv_data;
467 // FIXME: it may change ?
468 // if (avctx->bits_per_sample == 24)
469 // avctx->pix_fmt = PIX_FMT_RGB24;
471 // avctx->pix_fmt = PIX_FMT_RGB555;
473 avctx->has_b_frames = 0;
474 s->frame.data[0] = s->prev_frame.data[0] = NULL;
476 /* there is a vertical predictor for each pixel in a line; each vertical
477 * predictor is 0 to start with */
479 (unsigned int *)av_malloc(s->avctx->width * sizeof(unsigned int));
485 Block decoding order:
491 hres,vres,i,i%vres (0 < i < 4)
510 #define GET_NEXT_INDEX() \
512 if (index_stream_index >= s->index_stream_size) { \
513 av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \
516 index = s->index_stream[index_stream_index++] * 4; \
519 #define APPLY_C_PREDICTOR() \
520 predictor_pair = s->c_predictor_table[index]; \
521 horiz_pred += (predictor_pair >> 1); \
522 if (predictor_pair & 1) { \
526 predictor_pair = s->c_predictor_table[index]; \
527 horiz_pred += ((predictor_pair >> 1) * 5); \
528 if (predictor_pair & 1) \
536 #define APPLY_C_PREDICTOR_24() \
537 predictor_pair = s->c_predictor_table[index]; \
538 horiz_pred += (predictor_pair >> 1); \
539 if (predictor_pair & 1) { \
543 predictor_pair = s->fat_c_predictor_table[index]; \
544 horiz_pred += (predictor_pair >> 1); \
545 if (predictor_pair & 1) \
554 #define APPLY_Y_PREDICTOR() \
555 predictor_pair = s->y_predictor_table[index]; \
556 horiz_pred += (predictor_pair >> 1); \
557 if (predictor_pair & 1) { \
561 predictor_pair = s->y_predictor_table[index]; \
562 horiz_pred += ((predictor_pair >> 1) * 5); \
563 if (predictor_pair & 1) \
571 #define APPLY_Y_PREDICTOR_24() \
572 predictor_pair = s->y_predictor_table[index]; \
573 horiz_pred += (predictor_pair >> 1); \
574 if (predictor_pair & 1) { \
578 predictor_pair = s->fat_y_predictor_table[index]; \
579 horiz_pred += (predictor_pair >> 1); \
580 if (predictor_pair & 1) \
588 #define OUTPUT_PIXEL_PAIR() \
589 *current_pixel_pair = *vert_pred + horiz_pred; \
590 *vert_pred++ = *current_pixel_pair++; \
593 static void truemotion1_decode_16bit(TrueMotion1Context *s)
596 int pixels_left; /* remaining pixels on this line */
597 unsigned int predictor_pair;
598 unsigned int horiz_pred;
599 unsigned int *vert_pred;
600 unsigned int *current_pixel_pair;
601 unsigned int *prev_pixel_pair;
602 unsigned char *current_line = s->frame.data[0];
603 unsigned char *prev_line = s->prev_frame.data[0];
604 int keyframe = s->flags & FLAG_KEYFRAME;
606 /* these variables are for managing the stream of macroblock change bits */
607 unsigned char *mb_change_bits = s->mb_change_bits;
608 unsigned char mb_change_byte;
609 unsigned char mb_change_byte_mask;
612 /* these variables are for managing the main index stream */
613 int index_stream_index = 0; /* yes, the index into the index stream */
616 /* clean out the line buffer */
617 memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
621 for (y = 0; y < s->avctx->height; y++) {
623 /* re-init variables for the next line iteration */
625 current_pixel_pair = (unsigned int *)current_line;
626 prev_pixel_pair = (unsigned int *)prev_line;
627 vert_pred = s->vert_pred;
629 mb_change_byte = mb_change_bits[mb_change_index++];
630 mb_change_byte_mask = 0x01;
631 pixels_left = s->avctx->width;
633 while (pixels_left > 0) {
635 if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
639 /* if macroblock width is 2, apply C-Y-C-Y; else
641 if (s->block_width == 2) {
659 /* always apply 2 Y predictors on these iterations */
667 /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
668 * depending on the macroblock type */
669 if (s->block_type == BLOCK_2x2) {
676 } else if (s->block_type == BLOCK_4x2) {
693 /* skip (copy) four pixels, but reassign the horizontal
695 *current_pixel_pair = *prev_pixel_pair++;
696 *vert_pred++ = *current_pixel_pair++;
697 *current_pixel_pair = *prev_pixel_pair++;
698 horiz_pred = *current_pixel_pair - *vert_pred;
699 *vert_pred++ = *current_pixel_pair++;
704 mb_change_byte_mask <<= 1;
707 if (!mb_change_byte_mask) {
708 mb_change_byte = mb_change_bits[mb_change_index++];
709 mb_change_byte_mask = 0x01;
716 /* next change row */
717 if (((y + 1) & 3) == 0)
718 mb_change_bits += s->mb_change_bits_row_size;
720 current_line += s->frame.linesize[0];
721 prev_line += s->prev_frame.linesize[0];
725 static void truemotion1_decode_24bit(TrueMotion1Context *s)
728 int pixels_left; /* remaining pixels on this line */
729 unsigned int predictor_pair;
730 unsigned int horiz_pred;
731 unsigned int *vert_pred;
732 unsigned int *current_pixel_pair;
733 unsigned int *prev_pixel_pair;
734 unsigned char *current_line = s->frame.data[0];
735 unsigned char *prev_line = s->prev_frame.data[0];
736 int keyframe = s->flags & FLAG_KEYFRAME;
738 /* these variables are for managing the stream of macroblock change bits */
739 unsigned char *mb_change_bits = s->mb_change_bits;
740 unsigned char mb_change_byte;
741 unsigned char mb_change_byte_mask;
744 /* these variables are for managing the main index stream */
745 int index_stream_index = 0; /* yes, the index into the index stream */
748 /* clean out the line buffer */
749 memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
753 for (y = 0; y < s->avctx->height; y++) {
755 /* re-init variables for the next line iteration */
757 current_pixel_pair = (unsigned int *)current_line;
758 prev_pixel_pair = (unsigned int *)prev_line;
759 vert_pred = s->vert_pred;
761 mb_change_byte = mb_change_bits[mb_change_index++];
762 mb_change_byte_mask = 0x01;
763 pixels_left = s->avctx->width;
765 while (pixels_left > 0) {
767 if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
771 /* if macroblock width is 2, apply C-Y-C-Y; else
773 if (s->block_width == 2) {
774 APPLY_C_PREDICTOR_24();
775 APPLY_Y_PREDICTOR_24();
777 APPLY_C_PREDICTOR_24();
778 APPLY_Y_PREDICTOR_24();
781 APPLY_C_PREDICTOR_24();
782 APPLY_Y_PREDICTOR_24();
784 APPLY_Y_PREDICTOR_24();
791 /* always apply 2 Y predictors on these iterations */
792 APPLY_Y_PREDICTOR_24();
794 APPLY_Y_PREDICTOR_24();
799 /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
800 * depending on the macroblock type */
801 if (s->block_type == BLOCK_2x2) {
802 APPLY_C_PREDICTOR_24();
803 APPLY_Y_PREDICTOR_24();
805 APPLY_C_PREDICTOR_24();
806 APPLY_Y_PREDICTOR_24();
808 } else if (s->block_type == BLOCK_4x2) {
809 APPLY_C_PREDICTOR_24();
810 APPLY_Y_PREDICTOR_24();
812 APPLY_Y_PREDICTOR_24();
815 APPLY_Y_PREDICTOR_24();
817 APPLY_Y_PREDICTOR_24();
825 /* skip (copy) four pixels, but reassign the horizontal
827 *current_pixel_pair = *prev_pixel_pair++;
828 *vert_pred++ = *current_pixel_pair++;
829 *current_pixel_pair = *prev_pixel_pair++;
830 horiz_pred = *current_pixel_pair - *vert_pred;
831 *vert_pred++ = *current_pixel_pair++;
836 mb_change_byte_mask <<= 1;
839 if (!mb_change_byte_mask) {
840 mb_change_byte = mb_change_bits[mb_change_index++];
841 mb_change_byte_mask = 0x01;
848 /* next change row */
849 if (((y + 1) & 3) == 0)
850 mb_change_bits += s->mb_change_bits_row_size;
852 current_line += s->frame.linesize[0];
853 prev_line += s->prev_frame.linesize[0];
858 static int truemotion1_decode_frame(AVCodecContext *avctx,
859 void *data, int *data_size,
860 uint8_t *buf, int buf_size)
862 TrueMotion1Context *s = (TrueMotion1Context *)avctx->priv_data;
867 if (truemotion1_decode_header(s) == -1)
870 s->frame.reference = 1;
871 if (avctx->get_buffer(avctx, &s->frame) < 0) {
872 av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
876 /* check for a do-nothing frame and copy the previous frame */
877 if (compression_types[s->compression].algorithm == ALGO_NOP)
879 memcpy(s->frame.data[0], s->prev_frame.data[0],
880 s->frame.linesize[0] * s->avctx->height);
881 } else if (compression_types[s->compression].algorithm == ALGO_RGB24H) {
882 truemotion1_decode_24bit(s);
884 truemotion1_decode_16bit(s);
887 if (s->prev_frame.data[0])
888 avctx->release_buffer(avctx, &s->prev_frame);
891 s->prev_frame = s->frame;
893 *data_size = sizeof(AVFrame);
894 *(AVFrame*)data = s->frame;
896 /* report that the buffer was completely consumed */
900 static int truemotion1_decode_end(AVCodecContext *avctx)
902 TrueMotion1Context *s = (TrueMotion1Context *)avctx->priv_data;
904 /* release the last frame */
905 if (s->prev_frame.data[0])
906 avctx->release_buffer(avctx, &s->prev_frame);
908 av_free(s->vert_pred);
913 AVCodec truemotion1_decoder = {
916 CODEC_ID_TRUEMOTION1,
917 sizeof(TrueMotion1Context),
918 truemotion1_decode_init,
920 truemotion1_decode_end,
921 truemotion1_decode_frame,