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 = AV_RL16(&header_buffer[3]);
352 header.xsize = AV_RL16(&header_buffer[5]);
353 header.checksum = AV_RL16(&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");
377 /* FIXME header.width, height, xoffset and yoffset aren't initialized */
380 s->h = header.height;
381 s->x = header.xoffset;
382 s->y = header.yoffset;
389 if (header.header_type < 2) {
390 if ((s->w < 213) && (s->h >= 176))
392 s->flags |= FLAG_INTERPOLATED;
393 av_log(s->avctx, AV_LOG_INFO, "INTERPOLATION selected, please report the sample to the developers\n");
398 if (header.compression > 17) {
399 av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression);
403 if ((header.deltaset != s->last_deltaset) ||
404 (header.vectable != s->last_vectable))
405 select_delta_tables(s, header.deltaset);
407 if ((header.compression & 1) && header.header_type)
408 sel_vector_table = pc_tbl2;
410 if (header.vectable < 4)
411 sel_vector_table = tables[header.vectable - 1];
413 av_log(s->avctx, AV_LOG_ERROR, "invalid vector table id (%d)\n", header.vectable);
418 // FIXME: where to place this ?!?!
419 if (compression_types[header.compression].algorithm == ALGO_RGB24H)
420 s->avctx->pix_fmt = PIX_FMT_RGB32;
422 s->avctx->pix_fmt = PIX_FMT_RGB555; // RGB565 is supported as well
424 if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable))
426 if (compression_types[header.compression].algorithm == ALGO_RGB24H)
427 gen_vector_table24(s, sel_vector_table);
429 if (s->avctx->pix_fmt == PIX_FMT_RGB555)
430 gen_vector_table15(s, sel_vector_table);
432 gen_vector_table16(s, sel_vector_table);
435 /* set up pointers to the other key data chunks */
436 s->mb_change_bits = s->buf + header.header_size;
437 if (s->flags & FLAG_KEYFRAME) {
438 /* no change bits specified for a keyframe; only index bytes */
439 s->index_stream = s->mb_change_bits;
441 /* one change bit per 4x4 block */
442 s->index_stream = s->mb_change_bits +
443 (s->mb_change_bits_row_size * (s->avctx->height >> 2));
445 s->index_stream_size = s->size - (s->index_stream - s->buf);
447 s->last_deltaset = header.deltaset;
448 s->last_vectable = header.vectable;
449 s->compression = header.compression;
450 s->block_width = compression_types[header.compression].block_width;
451 s->block_height = compression_types[header.compression].block_height;
452 s->block_type = compression_types[header.compression].block_type;
454 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
455 av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n",
456 s->last_deltaset, s->last_vectable, s->compression, s->block_width,
457 s->block_height, s->block_type,
458 s->flags & FLAG_KEYFRAME ? " KEY" : "",
459 s->flags & FLAG_INTERFRAME ? " INTER" : "",
460 s->flags & FLAG_SPRITE ? " SPRITE" : "",
461 s->flags & FLAG_INTERPOLATED ? " INTERPOL" : "");
463 return header.header_size;
466 static int truemotion1_decode_init(AVCodecContext *avctx)
468 TrueMotion1Context *s = (TrueMotion1Context *)avctx->priv_data;
472 // FIXME: it may change ?
473 // if (avctx->bits_per_sample == 24)
474 // avctx->pix_fmt = PIX_FMT_RGB24;
476 // avctx->pix_fmt = PIX_FMT_RGB555;
478 s->frame.data[0] = s->prev_frame.data[0] = NULL;
480 /* there is a vertical predictor for each pixel in a line; each vertical
481 * predictor is 0 to start with */
483 (unsigned int *)av_malloc(s->avctx->width * sizeof(unsigned int));
489 Block decoding order:
495 hres,vres,i,i%vres (0 < i < 4)
514 #define GET_NEXT_INDEX() \
516 if (index_stream_index >= s->index_stream_size) { \
517 av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \
520 index = s->index_stream[index_stream_index++] * 4; \
523 #define APPLY_C_PREDICTOR() \
524 predictor_pair = s->c_predictor_table[index]; \
525 horiz_pred += (predictor_pair >> 1); \
526 if (predictor_pair & 1) { \
530 predictor_pair = s->c_predictor_table[index]; \
531 horiz_pred += ((predictor_pair >> 1) * 5); \
532 if (predictor_pair & 1) \
540 #define APPLY_C_PREDICTOR_24() \
541 predictor_pair = s->c_predictor_table[index]; \
542 horiz_pred += (predictor_pair >> 1); \
543 if (predictor_pair & 1) { \
547 predictor_pair = s->fat_c_predictor_table[index]; \
548 horiz_pred += (predictor_pair >> 1); \
549 if (predictor_pair & 1) \
558 #define APPLY_Y_PREDICTOR() \
559 predictor_pair = s->y_predictor_table[index]; \
560 horiz_pred += (predictor_pair >> 1); \
561 if (predictor_pair & 1) { \
565 predictor_pair = s->y_predictor_table[index]; \
566 horiz_pred += ((predictor_pair >> 1) * 5); \
567 if (predictor_pair & 1) \
575 #define APPLY_Y_PREDICTOR_24() \
576 predictor_pair = s->y_predictor_table[index]; \
577 horiz_pred += (predictor_pair >> 1); \
578 if (predictor_pair & 1) { \
582 predictor_pair = s->fat_y_predictor_table[index]; \
583 horiz_pred += (predictor_pair >> 1); \
584 if (predictor_pair & 1) \
592 #define OUTPUT_PIXEL_PAIR() \
593 *current_pixel_pair = *vert_pred + horiz_pred; \
594 *vert_pred++ = *current_pixel_pair++; \
597 static void truemotion1_decode_16bit(TrueMotion1Context *s)
600 int pixels_left; /* remaining pixels on this line */
601 unsigned int predictor_pair;
602 unsigned int horiz_pred;
603 unsigned int *vert_pred;
604 unsigned int *current_pixel_pair;
605 unsigned int *prev_pixel_pair;
606 unsigned char *current_line = s->frame.data[0];
607 unsigned char *prev_line = s->prev_frame.data[0];
608 int keyframe = s->flags & FLAG_KEYFRAME;
610 /* these variables are for managing the stream of macroblock change bits */
611 unsigned char *mb_change_bits = s->mb_change_bits;
612 unsigned char mb_change_byte;
613 unsigned char mb_change_byte_mask;
616 /* these variables are for managing the main index stream */
617 int index_stream_index = 0; /* yes, the index into the index stream */
620 /* clean out the line buffer */
621 memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
625 for (y = 0; y < s->avctx->height; y++) {
627 /* re-init variables for the next line iteration */
629 current_pixel_pair = (unsigned int *)current_line;
630 prev_pixel_pair = (unsigned int *)prev_line;
631 vert_pred = s->vert_pred;
633 mb_change_byte = mb_change_bits[mb_change_index++];
634 mb_change_byte_mask = 0x01;
635 pixels_left = s->avctx->width;
637 while (pixels_left > 0) {
639 if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
643 /* if macroblock width is 2, apply C-Y-C-Y; else
645 if (s->block_width == 2) {
663 /* always apply 2 Y predictors on these iterations */
671 /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
672 * depending on the macroblock type */
673 if (s->block_type == BLOCK_2x2) {
680 } else if (s->block_type == BLOCK_4x2) {
697 /* skip (copy) four pixels, but reassign the horizontal
699 *current_pixel_pair = *prev_pixel_pair++;
700 *vert_pred++ = *current_pixel_pair++;
701 *current_pixel_pair = *prev_pixel_pair++;
702 horiz_pred = *current_pixel_pair - *vert_pred;
703 *vert_pred++ = *current_pixel_pair++;
708 mb_change_byte_mask <<= 1;
711 if (!mb_change_byte_mask) {
712 mb_change_byte = mb_change_bits[mb_change_index++];
713 mb_change_byte_mask = 0x01;
720 /* next change row */
721 if (((y + 1) & 3) == 0)
722 mb_change_bits += s->mb_change_bits_row_size;
724 current_line += s->frame.linesize[0];
725 prev_line += s->prev_frame.linesize[0];
729 static void truemotion1_decode_24bit(TrueMotion1Context *s)
732 int pixels_left; /* remaining pixels on this line */
733 unsigned int predictor_pair;
734 unsigned int horiz_pred;
735 unsigned int *vert_pred;
736 unsigned int *current_pixel_pair;
737 unsigned int *prev_pixel_pair;
738 unsigned char *current_line = s->frame.data[0];
739 unsigned char *prev_line = s->prev_frame.data[0];
740 int keyframe = s->flags & FLAG_KEYFRAME;
742 /* these variables are for managing the stream of macroblock change bits */
743 unsigned char *mb_change_bits = s->mb_change_bits;
744 unsigned char mb_change_byte;
745 unsigned char mb_change_byte_mask;
748 /* these variables are for managing the main index stream */
749 int index_stream_index = 0; /* yes, the index into the index stream */
752 /* clean out the line buffer */
753 memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
757 for (y = 0; y < s->avctx->height; y++) {
759 /* re-init variables for the next line iteration */
761 current_pixel_pair = (unsigned int *)current_line;
762 prev_pixel_pair = (unsigned int *)prev_line;
763 vert_pred = s->vert_pred;
765 mb_change_byte = mb_change_bits[mb_change_index++];
766 mb_change_byte_mask = 0x01;
767 pixels_left = s->avctx->width;
769 while (pixels_left > 0) {
771 if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
775 /* if macroblock width is 2, apply C-Y-C-Y; else
777 if (s->block_width == 2) {
778 APPLY_C_PREDICTOR_24();
779 APPLY_Y_PREDICTOR_24();
781 APPLY_C_PREDICTOR_24();
782 APPLY_Y_PREDICTOR_24();
785 APPLY_C_PREDICTOR_24();
786 APPLY_Y_PREDICTOR_24();
788 APPLY_Y_PREDICTOR_24();
795 /* always apply 2 Y predictors on these iterations */
796 APPLY_Y_PREDICTOR_24();
798 APPLY_Y_PREDICTOR_24();
803 /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
804 * depending on the macroblock type */
805 if (s->block_type == BLOCK_2x2) {
806 APPLY_C_PREDICTOR_24();
807 APPLY_Y_PREDICTOR_24();
809 APPLY_C_PREDICTOR_24();
810 APPLY_Y_PREDICTOR_24();
812 } else if (s->block_type == BLOCK_4x2) {
813 APPLY_C_PREDICTOR_24();
814 APPLY_Y_PREDICTOR_24();
816 APPLY_Y_PREDICTOR_24();
819 APPLY_Y_PREDICTOR_24();
821 APPLY_Y_PREDICTOR_24();
829 /* skip (copy) four pixels, but reassign the horizontal
831 *current_pixel_pair = *prev_pixel_pair++;
832 *vert_pred++ = *current_pixel_pair++;
833 *current_pixel_pair = *prev_pixel_pair++;
834 horiz_pred = *current_pixel_pair - *vert_pred;
835 *vert_pred++ = *current_pixel_pair++;
840 mb_change_byte_mask <<= 1;
843 if (!mb_change_byte_mask) {
844 mb_change_byte = mb_change_bits[mb_change_index++];
845 mb_change_byte_mask = 0x01;
852 /* next change row */
853 if (((y + 1) & 3) == 0)
854 mb_change_bits += s->mb_change_bits_row_size;
856 current_line += s->frame.linesize[0];
857 prev_line += s->prev_frame.linesize[0];
862 static int truemotion1_decode_frame(AVCodecContext *avctx,
863 void *data, int *data_size,
864 uint8_t *buf, int buf_size)
866 TrueMotion1Context *s = (TrueMotion1Context *)avctx->priv_data;
871 if (truemotion1_decode_header(s) == -1)
874 s->frame.reference = 1;
875 if (avctx->get_buffer(avctx, &s->frame) < 0) {
876 av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
880 /* check for a do-nothing frame and copy the previous frame */
881 if (compression_types[s->compression].algorithm == ALGO_NOP)
883 memcpy(s->frame.data[0], s->prev_frame.data[0],
884 s->frame.linesize[0] * s->avctx->height);
885 } else if (compression_types[s->compression].algorithm == ALGO_RGB24H) {
886 truemotion1_decode_24bit(s);
888 truemotion1_decode_16bit(s);
891 if (s->prev_frame.data[0])
892 avctx->release_buffer(avctx, &s->prev_frame);
895 s->prev_frame = s->frame;
897 *data_size = sizeof(AVFrame);
898 *(AVFrame*)data = s->frame;
900 /* report that the buffer was completely consumed */
904 static int truemotion1_decode_end(AVCodecContext *avctx)
906 TrueMotion1Context *s = (TrueMotion1Context *)avctx->priv_data;
908 /* release the last frame */
909 if (s->prev_frame.data[0])
910 avctx->release_buffer(avctx, &s->prev_frame);
912 av_free(s->vert_pred);
917 AVCodec truemotion1_decoder = {
920 CODEC_ID_TRUEMOTION1,
921 sizeof(TrueMotion1Context),
922 truemotion1_decode_init,
924 truemotion1_decode_end,
925 truemotion1_decode_frame,