2 * Interplay MVE Video Decoder
3 * Copyright (C) 2003 the ffmpeg project
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * @file interplayvideo.c
23 * Interplay MVE Video Decoder by Mike Melanson (melanson@pcisys.net)
24 * For more information about the Interplay MVE format, visit:
25 * http://www.pcisys.net/~melanson/codecs/interplay-mve.txt
26 * This code is written in such a way that the identifiers match up
27 * with the encoding descriptions in the document.
29 * This decoder presently only supports a PAL8 output colorspace.
31 * An Interplay video frame consists of 2 parts: The decoding map and
32 * the video data. A demuxer must load these 2 parts together in a single
33 * buffer before sending it through the stream to this decoder.
45 #define PALETTE_COUNT 256
47 /* debugging support */
48 #define DEBUG_INTERPLAY 0
50 #define debug_interplay printf
52 static inline void debug_interplay(const char *format, ...) { }
55 typedef struct IpvideoContext {
57 AVCodecContext *avctx;
59 AVFrame second_last_frame;
61 AVFrame current_frame;
62 unsigned char *decoding_map;
63 int decoding_map_size;
68 unsigned char palette[PALETTE_COUNT * 4];
70 unsigned char *stream_ptr;
71 unsigned char *stream_end;
72 unsigned char *pixel_ptr;
75 int upper_motion_limit_offset;
79 #define CHECK_STREAM_PTR(n) \
80 if ((s->stream_ptr + n) > s->stream_end) { \
81 printf ("Interplay video warning: stream_ptr out of bounds (%p >= %p)\n", \
82 s->stream_ptr + n, s->stream_end); \
86 static void ipvideo_new_palette(IpvideoContext *s, unsigned char *palette) {
89 unsigned char r, g, b;
90 unsigned int *palette32;
92 palette32 = (unsigned int *)s->palette;
93 for (i = 0; i < PALETTE_COUNT; i++) {
97 palette32[i] = (r << 16) | (g << 8) | (b);
101 #define COPY_FROM_CURRENT() \
102 motion_offset = current_offset; \
103 motion_offset += y * s->stride; \
104 motion_offset += x; \
105 if (motion_offset < 0) { \
106 printf (" Interplay video: motion offset < 0 (%d)\n", motion_offset); \
108 } else if (motion_offset > s->upper_motion_limit_offset) { \
109 printf (" Interplay video: motion offset above limit (%d >= %d)\n", \
110 motion_offset, s->upper_motion_limit_offset); \
113 s->dsp.put_pixels_tab[0][0](s->pixel_ptr, \
114 s->current_frame.data[0] + motion_offset, s->stride, 8);
116 #define COPY_FROM_PREVIOUS() \
117 motion_offset = current_offset; \
118 motion_offset += y * s->stride; \
119 motion_offset += x; \
120 if (motion_offset < 0) { \
121 printf (" Interplay video: motion offset < 0 (%d)\n", motion_offset); \
123 } else if (motion_offset > s->upper_motion_limit_offset) { \
124 printf (" Interplay video: motion offset above limit (%d >= %d)\n", \
125 motion_offset, s->upper_motion_limit_offset); \
128 s->dsp.put_pixels_tab[0][0](s->pixel_ptr, \
129 s->last_frame.data[0] + motion_offset, s->stride, 8);
131 #define COPY_FROM_SECOND_LAST() \
132 motion_offset = current_offset; \
133 motion_offset += y * s->stride; \
134 motion_offset += x; \
135 if (motion_offset < 0) { \
136 printf (" Interplay video: motion offset < 0 (%d)\n", motion_offset); \
138 } else if (motion_offset > s->upper_motion_limit_offset) { \
139 printf (" Interplay video: motion offset above limit (%d >= %d)\n", \
140 motion_offset, s->upper_motion_limit_offset); \
143 s->dsp.put_pixels_tab[0][0](s->pixel_ptr, \
144 s->second_last_frame.data[0] + motion_offset, s->stride, 8);
146 static int ipvideo_decode_block_opcode_0x0(IpvideoContext *s)
150 int current_offset = s->pixel_ptr - s->current_frame.data[0];
152 /* copy a block from the previous frame */
154 COPY_FROM_PREVIOUS();
160 static int ipvideo_decode_block_opcode_0x1(IpvideoContext *s)
164 int current_offset = s->pixel_ptr - s->current_frame.data[0];
166 /* copy block from 2 frames ago */
168 COPY_FROM_SECOND_LAST();
174 static int ipvideo_decode_block_opcode_0x2(IpvideoContext *s)
179 int current_offset = s->pixel_ptr - s->current_frame.data[0];
181 /* copy block from 2 frames ago using a motion vector; need 1 more byte */
183 B = *s->stream_ptr++;
189 x = -14 + ((B - 56) % 29);
190 y = 8 + ((B - 56) / 29);
193 debug_interplay (" motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
194 COPY_FROM_SECOND_LAST();
200 static int ipvideo_decode_block_opcode_0x3(IpvideoContext *s)
205 int current_offset = s->pixel_ptr - s->current_frame.data[0];
207 /* copy 8x8 block from current frame from an up/left block */
209 /* need 1 more byte for motion */
211 B = *s->stream_ptr++;
217 x = -(-14 + ((B - 56) % 29));
218 y = -( 8 + ((B - 56) / 29));
221 debug_interplay (" motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
228 static int ipvideo_decode_block_opcode_0x4(IpvideoContext *s)
231 unsigned char B, BL, BH;
233 int current_offset = s->pixel_ptr - s->current_frame.data[0];
235 /* copy a block from the previous frame; need 1 more byte */
238 B = *s->stream_ptr++;
240 BH = (B >> 4) & 0x0F;
244 debug_interplay (" motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
245 COPY_FROM_PREVIOUS();
251 static int ipvideo_decode_block_opcode_0x5(IpvideoContext *s)
255 int current_offset = s->pixel_ptr - s->current_frame.data[0];
257 /* copy a block from the previous frame using an expanded range;
258 * need 2 more bytes */
261 x = *s->stream_ptr++;
262 y = *s->stream_ptr++;
264 debug_interplay (" motion bytes = %d, %d\n", x, y);
265 COPY_FROM_PREVIOUS();
271 static int ipvideo_decode_block_opcode_0x6(IpvideoContext *s)
273 /* mystery opcode? skip multiple blocks? */
274 printf (" Interplay video: Help! Mystery opcode 0x6 seen\n");
280 static int ipvideo_decode_block_opcode_0x7(IpvideoContext *s)
283 unsigned char P0, P1;
288 /* 2-color encoding */
291 P0 = *s->stream_ptr++;
292 P1 = *s->stream_ptr++;
296 /* need 8 more bytes from the stream */
298 for (y = 0; y < 8; y++)
299 B[y] = *s->stream_ptr++;
301 for (y = 0; y < 8; y++) {
303 for (x = 0x01; x <= 0x80; x <<= 1) {
305 *s->pixel_ptr++ = P1;
307 *s->pixel_ptr++ = P0;
309 s->pixel_ptr += s->line_inc;
314 /* need 2 more bytes from the stream */
316 B[0] = *s->stream_ptr++;
317 B[1] = *s->stream_ptr++;
319 flags = (B[1] << 8) | B[0];
321 for (y = 0; y < 8; y += 2) {
322 for (x = 0; x < 8; x += 2, bitmask <<= 1) {
323 if (flags & bitmask) {
324 *(s->pixel_ptr + x) = P1;
325 *(s->pixel_ptr + x + 1) = P1;
326 *(s->pixel_ptr + s->stride + x) = P1;
327 *(s->pixel_ptr + s->stride + x + 1) = P1;
329 *(s->pixel_ptr + x) = P0;
330 *(s->pixel_ptr + x + 1) = P0;
331 *(s->pixel_ptr + s->stride + x) = P0;
332 *(s->pixel_ptr + s->stride + x + 1) = P0;
335 s->pixel_ptr += s->stride * 2;
343 static int ipvideo_decode_block_opcode_0x8(IpvideoContext *s)
348 unsigned int flags = 0;
349 unsigned int bitmask = 0;
350 unsigned char P0 = 0, P1 = 0;
353 /* 2-color encoding for each 4x4 quadrant, or 2-color encoding on
354 * either top and bottom or left and right halves */
357 P[0] = *s->stream_ptr++;
358 P[1] = *s->stream_ptr++;
362 /* need 12 more bytes */
363 CHECK_STREAM_PTR(12);
364 B[0] = *s->stream_ptr++; B[1] = *s->stream_ptr++;
365 P[2] = *s->stream_ptr++; P[3] = *s->stream_ptr++;
366 B[2] = *s->stream_ptr++; B[3] = *s->stream_ptr++;
367 P[4] = *s->stream_ptr++; P[5] = *s->stream_ptr++;
368 B[4] = *s->stream_ptr++; B[5] = *s->stream_ptr++;
369 P[6] = *s->stream_ptr++; P[7] = *s->stream_ptr++;
370 B[6] = *s->stream_ptr++; B[7] = *s->stream_ptr++;
372 for (y = 0; y < 8; y++) {
374 /* time to reload flags? */
377 ((B[0] & 0xF0) << 4) | ((B[4] & 0xF0) << 8) |
378 ((B[0] & 0x0F) ) | ((B[4] & 0x0F) << 4) |
379 ((B[1] & 0xF0) << 20) | ((B[5] & 0xF0) << 24) |
380 ((B[1] & 0x0F) << 16) | ((B[5] & 0x0F) << 20);
381 bitmask = 0x00000001;
382 lower_half = 0; /* still on top half */
385 ((B[2] & 0xF0) << 4) | ((B[6] & 0xF0) << 8) |
386 ((B[2] & 0x0F) ) | ((B[6] & 0x0F) << 4) |
387 ((B[3] & 0xF0) << 20) | ((B[7] & 0xF0) << 24) |
388 ((B[3] & 0x0F) << 16) | ((B[7] & 0x0F) << 20);
389 bitmask = 0x00000001;
393 for (x = 0; x < 8; x++, bitmask <<= 1) {
394 /* get the pixel values ready for this quadrant */
396 P0 = P[lower_half + 0];
397 P1 = P[lower_half + 1];
399 P0 = P[lower_half + 4];
400 P1 = P[lower_half + 5];
404 *s->pixel_ptr++ = P1;
406 *s->pixel_ptr++ = P0;
408 s->pixel_ptr += s->line_inc;
413 /* need 10 more bytes */
414 CHECK_STREAM_PTR(10);
415 B[0] = *s->stream_ptr++; B[1] = *s->stream_ptr++;
416 B[2] = *s->stream_ptr++; B[3] = *s->stream_ptr++;
417 P[2] = *s->stream_ptr++; P[3] = *s->stream_ptr++;
418 B[4] = *s->stream_ptr++; B[5] = *s->stream_ptr++;
419 B[6] = *s->stream_ptr++; B[7] = *s->stream_ptr++;
423 /* vertical split; left & right halves are 2-color encoded */
425 for (y = 0; y < 8; y++) {
427 /* time to reload flags? */
430 ((B[0] & 0xF0) << 4) | ((B[4] & 0xF0) << 8) |
431 ((B[0] & 0x0F) ) | ((B[4] & 0x0F) << 4) |
432 ((B[1] & 0xF0) << 20) | ((B[5] & 0xF0) << 24) |
433 ((B[1] & 0x0F) << 16) | ((B[5] & 0x0F) << 20);
434 bitmask = 0x00000001;
437 ((B[2] & 0xF0) << 4) | ((B[6] & 0xF0) << 8) |
438 ((B[2] & 0x0F) ) | ((B[6] & 0x0F) << 4) |
439 ((B[3] & 0xF0) << 20) | ((B[7] & 0xF0) << 24) |
440 ((B[3] & 0x0F) << 16) | ((B[7] & 0x0F) << 20);
441 bitmask = 0x00000001;
444 for (x = 0; x < 8; x++, bitmask <<= 1) {
445 /* get the pixel values ready for this half */
455 *s->pixel_ptr++ = P1;
457 *s->pixel_ptr++ = P0;
459 s->pixel_ptr += s->line_inc;
464 /* horizontal split; top & bottom halves are 2-color encoded */
466 for (y = 0; y < 8; y++) {
477 for (bitmask = 0x01; bitmask <= 0x80; bitmask <<= 1) {
480 *s->pixel_ptr++ = P1;
482 *s->pixel_ptr++ = P0;
484 s->pixel_ptr += s->line_inc;
493 static int ipvideo_decode_block_opcode_0x9(IpvideoContext *s)
498 unsigned int flags = 0;
502 /* 4-color encoding */
505 for (y = 0; y < 4; y++)
506 P[y] = *s->stream_ptr++;
508 if ((P[0] <= P[1]) && (P[2] <= P[3])) {
510 /* 1 of 4 colors for each pixel, need 16 more bytes */
511 CHECK_STREAM_PTR(16);
513 for (y = 0; y < 8; y++) {
514 /* get the next set of 8 2-bit flags */
515 flags = (s->stream_ptr[1] << 8) | s->stream_ptr[0];
517 for (x = 0, shifter = 0; x < 8; x++, shifter += 2) {
518 *s->pixel_ptr++ = P[(flags >> shifter) & 0x03];
520 s->pixel_ptr += s->line_inc;
523 } else if ((P[0] <= P[1]) && (P[2] > P[3])) {
525 /* 1 of 4 colors for each 2x2 block, need 4 more bytes */
528 B[0] = *s->stream_ptr++;
529 B[1] = *s->stream_ptr++;
530 B[2] = *s->stream_ptr++;
531 B[3] = *s->stream_ptr++;
532 flags = (B[3] << 24) | (B[2] << 16) | (B[1] << 8) | B[0];
535 for (y = 0; y < 8; y += 2) {
536 for (x = 0; x < 8; x += 2, shifter += 2) {
537 pix = P[(flags >> shifter) & 0x03];
538 *(s->pixel_ptr + x) = pix;
539 *(s->pixel_ptr + x + 1) = pix;
540 *(s->pixel_ptr + s->stride + x) = pix;
541 *(s->pixel_ptr + s->stride + x + 1) = pix;
543 s->pixel_ptr += s->stride * 2;
546 } else if ((P[0] > P[1]) && (P[2] <= P[3])) {
548 /* 1 of 4 colors for each 2x1 block, need 8 more bytes */
551 for (y = 0; y < 8; y++) {
552 /* time to reload flags? */
553 if ((y == 0) || (y == 4)) {
554 B[0] = *s->stream_ptr++;
555 B[1] = *s->stream_ptr++;
556 B[2] = *s->stream_ptr++;
557 B[3] = *s->stream_ptr++;
558 flags = (B[3] << 24) | (B[2] << 16) | (B[1] << 8) | B[0];
561 for (x = 0; x < 8; x += 2, shifter += 2) {
562 pix = P[(flags >> shifter) & 0x03];
563 *(s->pixel_ptr + x) = pix;
564 *(s->pixel_ptr + x + 1) = pix;
566 s->pixel_ptr += s->stride;
571 /* 1 of 4 colors for each 1x2 block, need 8 more bytes */
574 for (y = 0; y < 8; y += 2) {
575 /* time to reload flags? */
576 if ((y == 0) || (y == 4)) {
577 B[0] = *s->stream_ptr++;
578 B[1] = *s->stream_ptr++;
579 B[2] = *s->stream_ptr++;
580 B[3] = *s->stream_ptr++;
581 flags = (B[3] << 24) | (B[2] << 16) | (B[1] << 8) | B[0];
584 for (x = 0; x < 8; x++, shifter += 2) {
585 pix = P[(flags >> shifter) & 0x03];
586 *(s->pixel_ptr + x) = pix;
587 *(s->pixel_ptr + s->stride + x) = pix;
589 s->pixel_ptr += s->stride * 2;
597 static int ipvideo_decode_block_opcode_0xA(IpvideoContext *s)
608 /* 4-color encoding for each 4x4 quadrant, or 4-color encoding on
609 * either top and bottom or left and right halves */
612 for (y = 0; y < 4; y++)
613 P[y] = *s->stream_ptr++;
617 /* 4-color encoding for each quadrant; need 28 more bytes */
618 CHECK_STREAM_PTR(28);
620 for (y = 0; y < 4; y++)
621 B[y] = *s->stream_ptr++;
622 for (y = 4; y < 16; y += 4) {
623 for (x = y; x < y + 4; x++)
624 P[x] = *s->stream_ptr++;
625 for (x = y; x < y + 4; x++)
626 B[x] = *s->stream_ptr++;
629 for (y = 0; y < 8; y++) {
631 lower_half = (y >= 4) ? 4 : 0;
632 flags = (B[y + 8] << 8) | B[y];
634 for (x = 0, shifter = 0; x < 8; x++, shifter += 2) {
635 split = (x >= 4) ? 8 : 0;
636 index = split + lower_half + ((flags >> shifter) & 0x03);
637 *s->pixel_ptr++ = P[index];
640 s->pixel_ptr += s->line_inc;
645 /* 4-color encoding for either left and right or top and bottom
646 * halves; need 20 more bytes */
647 CHECK_STREAM_PTR(20);
649 for (y = 0; y < 8; y++)
650 B[y] = *s->stream_ptr++;
651 for (y = 4; y < 8; y++)
652 P[y] = *s->stream_ptr++;
653 for (y = 8; y < 16; y++)
654 B[y] = *s->stream_ptr++;
658 /* block is divided into left and right halves */
659 for (y = 0; y < 8; y++) {
661 flags = (B[y + 8] << 8) | B[y];
664 for (x = 0, shifter = 0; x < 8; x++, shifter += 2) {
667 *s->pixel_ptr++ = P[split + ((flags >> shifter) & 0x03)];
670 s->pixel_ptr += s->line_inc;
675 /* block is divided into top and bottom halves */
677 for (y = 0; y < 8; y++) {
679 flags = (B[y * 2 + 1] << 8) | B[y * 2];
683 for (x = 0, shifter = 0; x < 8; x++, shifter += 2)
684 *s->pixel_ptr++ = P[split + ((flags >> shifter) & 0x03)];
686 s->pixel_ptr += s->line_inc;
695 static int ipvideo_decode_block_opcode_0xB(IpvideoContext *s)
699 /* 64-color encoding (each pixel in block is a different color) */
700 CHECK_STREAM_PTR(64);
702 for (y = 0; y < 8; y++) {
703 for (x = 0; x < 8; x++) {
704 *s->pixel_ptr++ = *s->stream_ptr++;
706 s->pixel_ptr += s->line_inc;
713 static int ipvideo_decode_block_opcode_0xC(IpvideoContext *s)
718 /* 16-color block encoding: each 2x2 block is a different color */
719 CHECK_STREAM_PTR(16);
721 for (y = 0; y < 8; y += 2) {
722 for (x = 0; x < 8; x += 2) {
723 pix = *s->stream_ptr++;
724 *(s->pixel_ptr + x) = pix;
725 *(s->pixel_ptr + x + 1) = pix;
726 *(s->pixel_ptr + s->stride + x) = pix;
727 *(s->pixel_ptr + s->stride + x + 1) = pix;
729 s->pixel_ptr += s->stride * 2;
736 static int ipvideo_decode_block_opcode_0xD(IpvideoContext *s)
740 unsigned char index = 0;
742 /* 4-color block encoding: each 4x4 block is a different color */
745 for (y = 0; y < 4; y++)
746 P[y] = *s->stream_ptr++;
748 for (y = 0; y < 8; y++) {
754 for (x = 0; x < 8; x++) {
757 *s->pixel_ptr++ = P[index];
759 s->pixel_ptr += s->line_inc;
766 static int ipvideo_decode_block_opcode_0xE(IpvideoContext *s)
771 /* 1-color encoding: the whole block is 1 solid color */
773 pix = *s->stream_ptr++;
775 for (y = 0; y < 8; y++) {
776 for (x = 0; x < 8; x++) {
777 *s->pixel_ptr++ = pix;
779 s->pixel_ptr += s->line_inc;
786 static int ipvideo_decode_block_opcode_0xF(IpvideoContext *s)
789 unsigned char sample0, sample1;
791 /* dithered encoding */
793 sample0 = *s->stream_ptr++;
794 sample1 = *s->stream_ptr++;
796 for (y = 0; y < 8; y++) {
797 for (x = 0; x < 8; x += 2) {
799 *s->pixel_ptr++ = sample1;
800 *s->pixel_ptr++ = sample0;
802 *s->pixel_ptr++ = sample0;
803 *s->pixel_ptr++ = sample1;
806 s->pixel_ptr += s->line_inc;
813 static int (*ipvideo_decode_block[16])(IpvideoContext *s);
815 static void ipvideo_decode_opcodes(IpvideoContext *s)
819 unsigned char opcode;
822 static int frame = 0;
824 debug_interplay("------------------ frame %d\n", frame);
827 for (x = 0; x < 16; x++)
830 /* this is PAL8, so make the palette available */
831 memcpy(s->current_frame.data[1], s->palette, PALETTE_COUNT * 4);
833 s->stride = s->current_frame.linesize[0];
834 s->stream_ptr = s->buf + 14; /* data starts 14 bytes in */
835 s->stream_end = s->buf + s->size;
836 s->line_inc = s->stride - 8;
837 s->upper_motion_limit_offset = (s->avctx->height - 8) * s->stride
838 + s->avctx->width - 8;
841 for (y = 0; y < (s->stride * s->avctx->height); y += s->stride * 8) {
842 for (x = y; x < y + s->avctx->width; x += 8) {
843 /* bottom nibble first, then top nibble (which makes it
844 * hard to use a GetBitcontext) */
846 opcode = s->decoding_map[index >> 1] >> 4;
848 opcode = s->decoding_map[index >> 1] & 0xF;
851 debug_interplay(" block @ (%3d, %3d): encoding 0x%X, data ptr @ %p\n",
852 x - y, y / s->stride, opcode, s->stream_ptr);
853 code_counts[opcode]++;
855 s->pixel_ptr = s->current_frame.data[0] + x;
856 ret = ipvideo_decode_block[opcode](s);
858 printf(" Interplay video: decode problem on frame %d, @ block (%d, %d)\n",
859 frame, x - y, y / s->stride);
864 if ((s->stream_ptr != s->stream_end) &&
865 (s->stream_ptr + 1 != s->stream_end)) {
866 printf (" Interplay video: decode finished with %d bytes left over\n",
867 s->stream_end - s->stream_ptr);
871 static int ipvideo_decode_init(AVCodecContext *avctx)
873 IpvideoContext *s = avctx->priv_data;
877 if (s->avctx->extradata_size != sizeof(AVPaletteControl)) {
878 printf (" Interplay video: expected extradata_size of %d\n",
879 sizeof(AVPaletteControl));
883 avctx->pix_fmt = PIX_FMT_PAL8;
884 avctx->has_b_frames = 0;
885 dsputil_init(&s->dsp, avctx);
887 /* decoding map contains 4 bits of information per 8x8 block */
888 s->decoding_map_size = avctx->width * avctx->height / (8 * 8 * 2);
890 /* assign block decode functions */
891 ipvideo_decode_block[0x0] = ipvideo_decode_block_opcode_0x0;
892 ipvideo_decode_block[0x1] = ipvideo_decode_block_opcode_0x1;
893 ipvideo_decode_block[0x2] = ipvideo_decode_block_opcode_0x2;
894 ipvideo_decode_block[0x3] = ipvideo_decode_block_opcode_0x3;
895 ipvideo_decode_block[0x4] = ipvideo_decode_block_opcode_0x4;
896 ipvideo_decode_block[0x5] = ipvideo_decode_block_opcode_0x5;
897 ipvideo_decode_block[0x6] = ipvideo_decode_block_opcode_0x6;
898 ipvideo_decode_block[0x7] = ipvideo_decode_block_opcode_0x7;
899 ipvideo_decode_block[0x8] = ipvideo_decode_block_opcode_0x8;
900 ipvideo_decode_block[0x9] = ipvideo_decode_block_opcode_0x9;
901 ipvideo_decode_block[0xA] = ipvideo_decode_block_opcode_0xA;
902 ipvideo_decode_block[0xB] = ipvideo_decode_block_opcode_0xB;
903 ipvideo_decode_block[0xC] = ipvideo_decode_block_opcode_0xC;
904 ipvideo_decode_block[0xD] = ipvideo_decode_block_opcode_0xD;
905 ipvideo_decode_block[0xE] = ipvideo_decode_block_opcode_0xE;
906 ipvideo_decode_block[0xF] = ipvideo_decode_block_opcode_0xF;
908 s->current_frame.data[0] = s->last_frame.data[0] =
909 s->second_last_frame.data[0] = NULL;
914 static int ipvideo_decode_frame(AVCodecContext *avctx,
915 void *data, int *data_size,
916 uint8_t *buf, int buf_size)
918 IpvideoContext *s = avctx->priv_data;
919 AVPaletteControl *palette_control = (AVPaletteControl *)avctx->extradata;
921 if (palette_control->palette_changed) {
922 /* load the new palette and reset the palette control */
923 ipvideo_new_palette(s, palette_control->palette);
924 palette_control->palette_changed = 0;
927 s->decoding_map = buf;
928 s->buf = buf + s->decoding_map_size;
929 s->size = buf_size - s->decoding_map_size;
931 s->current_frame.reference = 3;
932 if (avctx->get_buffer(avctx, &s->current_frame)) {
933 printf (" Interplay Video: get_buffer() failed\n");
937 ipvideo_decode_opcodes(s);
939 *data_size = sizeof(AVFrame);
940 *(AVFrame*)data = s->current_frame;
943 if (s->second_last_frame.data[0])
944 avctx->release_buffer(avctx, &s->second_last_frame);
945 s->second_last_frame = s->last_frame;
946 s->last_frame = s->current_frame;
947 s->current_frame.data[0] = NULL; /* catch any access attempts */
949 /* report that the buffer was completely consumed */
953 static int ipvideo_decode_end(AVCodecContext *avctx)
955 IpvideoContext *s = avctx->priv_data;
957 /* release the last frame */
958 if (s->last_frame.data[0])
959 avctx->release_buffer(avctx, &s->last_frame);
960 if (s->second_last_frame.data[0])
961 avctx->release_buffer(avctx, &s->second_last_frame);
966 AVCodec interplay_video_decoder = {
969 CODEC_ID_INTERPLAY_VIDEO,
970 sizeof(IpvideoContext),
974 ipvideo_decode_frame,