2 * Interplay MVE Video Decoder
3 * Copyright (C) 2003 the ffmpeg project
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
23 * @file libavcodec/interplayvideo.c
24 * Interplay MVE Video Decoder by Mike Melanson (melanson@pcisys.net)
25 * For more information about the Interplay MVE format, visit:
26 * http://www.pcisys.net/~melanson/codecs/interplay-mve.txt
27 * This code is written in such a way that the identifiers match up
28 * with the encoding descriptions in the document.
30 * This decoder presently only supports a PAL8 output colorspace.
32 * An Interplay video frame consists of 2 parts: The decoding map and
33 * the video data. A demuxer must load these 2 parts together in a single
34 * buffer before sending it through the stream to this decoder.
43 #include "bytestream.h"
46 #define PALETTE_COUNT 256
48 /* debugging support */
49 #define DEBUG_INTERPLAY 0
51 #define debug_interplay(x,...) av_log(NULL, AV_LOG_DEBUG, x, __VA_ARGS__)
53 static inline void debug_interplay(const char *format, ...) { }
56 typedef struct IpvideoContext {
58 AVCodecContext *avctx;
60 AVFrame second_last_frame;
62 AVFrame current_frame;
63 const unsigned char *decoding_map;
64 int decoding_map_size;
66 const unsigned char *buf;
69 const unsigned char *stream_ptr;
70 const unsigned char *stream_end;
71 unsigned char *pixel_ptr;
74 int upper_motion_limit_offset;
78 #define CHECK_STREAM_PTR(n) \
79 if ((s->stream_ptr + n) > s->stream_end) { \
80 av_log(s->avctx, AV_LOG_ERROR, "Interplay video warning: stream_ptr out of bounds (%p >= %p)\n", \
81 s->stream_ptr + n, s->stream_end); \
85 #define COPY_FROM_CURRENT() \
86 motion_offset = current_offset; \
87 motion_offset += y * s->stride; \
89 if (motion_offset < 0) { \
90 av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset < 0 (%d)\n", motion_offset); \
92 } else if (motion_offset > s->upper_motion_limit_offset) { \
93 av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset above limit (%d >= %d)\n", \
94 motion_offset, s->upper_motion_limit_offset); \
97 s->dsp.put_pixels_tab[1][0](s->pixel_ptr, \
98 s->current_frame.data[0] + motion_offset, s->stride, 8);
100 #define COPY_FROM_PREVIOUS() \
101 motion_offset = current_offset; \
102 motion_offset += y * s->stride; \
103 motion_offset += x; \
104 if (motion_offset < 0) { \
105 av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset < 0 (%d)\n", motion_offset); \
107 } else if (motion_offset > s->upper_motion_limit_offset) { \
108 av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset above limit (%d >= %d)\n", \
109 motion_offset, s->upper_motion_limit_offset); \
112 s->dsp.put_pixels_tab[1][0](s->pixel_ptr, \
113 s->last_frame.data[0] + motion_offset, s->stride, 8);
115 #define COPY_FROM_SECOND_LAST() \
116 motion_offset = current_offset; \
117 motion_offset += y * s->stride; \
118 motion_offset += x; \
119 if (motion_offset < 0) { \
120 av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset < 0 (%d)\n", motion_offset); \
122 } else if (motion_offset > s->upper_motion_limit_offset) { \
123 av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset above limit (%d >= %d)\n", \
124 motion_offset, s->upper_motion_limit_offset); \
127 s->dsp.put_pixels_tab[1][0](s->pixel_ptr, \
128 s->second_last_frame.data[0] + motion_offset, s->stride, 8);
130 static int ipvideo_decode_block_opcode_0x0(IpvideoContext *s)
134 int current_offset = s->pixel_ptr - s->current_frame.data[0];
136 /* copy a block from the previous frame */
138 COPY_FROM_PREVIOUS();
144 static int ipvideo_decode_block_opcode_0x1(IpvideoContext *s)
148 int current_offset = s->pixel_ptr - s->current_frame.data[0];
150 /* copy block from 2 frames ago */
152 COPY_FROM_SECOND_LAST();
158 static int ipvideo_decode_block_opcode_0x2(IpvideoContext *s)
163 int current_offset = s->pixel_ptr - s->current_frame.data[0];
165 /* copy block from 2 frames ago using a motion vector; need 1 more byte */
167 B = *s->stream_ptr++;
173 x = -14 + ((B - 56) % 29);
174 y = 8 + ((B - 56) / 29);
177 debug_interplay (" motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
178 COPY_FROM_SECOND_LAST();
184 static int ipvideo_decode_block_opcode_0x3(IpvideoContext *s)
189 int current_offset = s->pixel_ptr - s->current_frame.data[0];
191 /* copy 8x8 block from current frame from an up/left block */
193 /* need 1 more byte for motion */
195 B = *s->stream_ptr++;
201 x = -(-14 + ((B - 56) % 29));
202 y = -( 8 + ((B - 56) / 29));
205 debug_interplay (" motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
212 static int ipvideo_decode_block_opcode_0x4(IpvideoContext *s)
215 unsigned char B, BL, BH;
217 int current_offset = s->pixel_ptr - s->current_frame.data[0];
219 /* copy a block from the previous frame; need 1 more byte */
222 B = *s->stream_ptr++;
224 BH = (B >> 4) & 0x0F;
228 debug_interplay (" motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
229 COPY_FROM_PREVIOUS();
235 static int ipvideo_decode_block_opcode_0x5(IpvideoContext *s)
239 int current_offset = s->pixel_ptr - s->current_frame.data[0];
241 /* copy a block from the previous frame using an expanded range;
242 * need 2 more bytes */
245 x = *s->stream_ptr++;
246 y = *s->stream_ptr++;
248 debug_interplay (" motion bytes = %d, %d\n", x, y);
249 COPY_FROM_PREVIOUS();
255 static int ipvideo_decode_block_opcode_0x6(IpvideoContext *s)
257 /* mystery opcode? skip multiple blocks? */
258 av_log(s->avctx, AV_LOG_ERROR, " Interplay video: Help! Mystery opcode 0x6 seen\n");
264 static int ipvideo_decode_block_opcode_0x7(IpvideoContext *s)
267 unsigned char P0, P1;
272 /* 2-color encoding */
275 P0 = *s->stream_ptr++;
276 P1 = *s->stream_ptr++;
280 /* need 8 more bytes from the stream */
282 for (y = 0; y < 8; y++)
283 B[y] = *s->stream_ptr++;
285 for (y = 0; y < 8; y++) {
287 for (x = 0x01; x <= 0x80; x <<= 1) {
289 *s->pixel_ptr++ = P1;
291 *s->pixel_ptr++ = P0;
293 s->pixel_ptr += s->line_inc;
298 /* need 2 more bytes from the stream */
301 flags = bytestream_get_le16(&s->stream_ptr);
303 for (y = 0; y < 8; y += 2) {
304 for (x = 0; x < 8; x += 2, bitmask <<= 1) {
305 if (flags & bitmask) {
306 *(s->pixel_ptr + x) = P1;
307 *(s->pixel_ptr + x + 1) = P1;
308 *(s->pixel_ptr + s->stride + x) = P1;
309 *(s->pixel_ptr + s->stride + x + 1) = P1;
311 *(s->pixel_ptr + x) = P0;
312 *(s->pixel_ptr + x + 1) = P0;
313 *(s->pixel_ptr + s->stride + x) = P0;
314 *(s->pixel_ptr + s->stride + x + 1) = P0;
317 s->pixel_ptr += s->stride * 2;
325 static int ipvideo_decode_block_opcode_0x8(IpvideoContext *s)
330 unsigned int flags = 0;
331 unsigned int bitmask = 0;
332 unsigned char P0 = 0, P1 = 0;
335 /* 2-color encoding for each 4x4 quadrant, or 2-color encoding on
336 * either top and bottom or left and right halves */
339 P[0] = *s->stream_ptr++;
340 P[1] = *s->stream_ptr++;
344 /* need 12 more bytes */
345 CHECK_STREAM_PTR(12);
346 B[0] = *s->stream_ptr++; B[1] = *s->stream_ptr++;
347 P[2] = *s->stream_ptr++; P[3] = *s->stream_ptr++;
348 B[2] = *s->stream_ptr++; B[3] = *s->stream_ptr++;
349 P[4] = *s->stream_ptr++; P[5] = *s->stream_ptr++;
350 B[4] = *s->stream_ptr++; B[5] = *s->stream_ptr++;
351 P[6] = *s->stream_ptr++; P[7] = *s->stream_ptr++;
352 B[6] = *s->stream_ptr++; B[7] = *s->stream_ptr++;
354 for (y = 0; y < 8; y++) {
356 /* time to reload flags? */
359 ((B[0] & 0xF0) << 4) | ((B[4] & 0xF0) << 8) |
360 ((B[0] & 0x0F) ) | ((B[4] & 0x0F) << 4) |
361 ((B[1] & 0xF0) << 20) | ((B[5] & 0xF0) << 24) |
362 ((B[1] & 0x0F) << 16) | ((B[5] & 0x0F) << 20);
363 bitmask = 0x00000001;
364 lower_half = 0; /* still on top half */
367 ((B[2] & 0xF0) << 4) | ((B[6] & 0xF0) << 8) |
368 ((B[2] & 0x0F) ) | ((B[6] & 0x0F) << 4) |
369 ((B[3] & 0xF0) << 20) | ((B[7] & 0xF0) << 24) |
370 ((B[3] & 0x0F) << 16) | ((B[7] & 0x0F) << 20);
371 bitmask = 0x00000001;
375 for (x = 0; x < 8; x++, bitmask <<= 1) {
376 /* get the pixel values ready for this quadrant */
378 P0 = P[lower_half + 0];
379 P1 = P[lower_half + 1];
381 P0 = P[lower_half + 4];
382 P1 = P[lower_half + 5];
386 *s->pixel_ptr++ = P1;
388 *s->pixel_ptr++ = P0;
390 s->pixel_ptr += s->line_inc;
395 /* need 10 more bytes */
396 CHECK_STREAM_PTR(10);
397 B[0] = *s->stream_ptr++; B[1] = *s->stream_ptr++;
398 B[2] = *s->stream_ptr++; B[3] = *s->stream_ptr++;
399 P[2] = *s->stream_ptr++; P[3] = *s->stream_ptr++;
400 B[4] = *s->stream_ptr++; B[5] = *s->stream_ptr++;
401 B[6] = *s->stream_ptr++; B[7] = *s->stream_ptr++;
405 /* vertical split; left & right halves are 2-color encoded */
407 for (y = 0; y < 8; y++) {
409 /* time to reload flags? */
412 ((B[0] & 0xF0) << 4) | ((B[4] & 0xF0) << 8) |
413 ((B[0] & 0x0F) ) | ((B[4] & 0x0F) << 4) |
414 ((B[1] & 0xF0) << 20) | ((B[5] & 0xF0) << 24) |
415 ((B[1] & 0x0F) << 16) | ((B[5] & 0x0F) << 20);
416 bitmask = 0x00000001;
419 ((B[2] & 0xF0) << 4) | ((B[6] & 0xF0) << 8) |
420 ((B[2] & 0x0F) ) | ((B[6] & 0x0F) << 4) |
421 ((B[3] & 0xF0) << 20) | ((B[7] & 0xF0) << 24) |
422 ((B[3] & 0x0F) << 16) | ((B[7] & 0x0F) << 20);
423 bitmask = 0x00000001;
426 for (x = 0; x < 8; x++, bitmask <<= 1) {
427 /* get the pixel values ready for this half */
437 *s->pixel_ptr++ = P1;
439 *s->pixel_ptr++ = P0;
441 s->pixel_ptr += s->line_inc;
446 /* horizontal split; top & bottom halves are 2-color encoded */
448 for (y = 0; y < 8; y++) {
459 for (bitmask = 0x01; bitmask <= 0x80; bitmask <<= 1) {
462 *s->pixel_ptr++ = P1;
464 *s->pixel_ptr++ = P0;
466 s->pixel_ptr += s->line_inc;
475 static int ipvideo_decode_block_opcode_0x9(IpvideoContext *s)
479 unsigned int flags = 0;
483 /* 4-color encoding */
486 for (y = 0; y < 4; y++)
487 P[y] = *s->stream_ptr++;
489 if ((P[0] <= P[1]) && (P[2] <= P[3])) {
491 /* 1 of 4 colors for each pixel, need 16 more bytes */
492 CHECK_STREAM_PTR(16);
494 for (y = 0; y < 8; y++) {
495 /* get the next set of 8 2-bit flags */
496 flags = bytestream_get_le16(&s->stream_ptr);
497 for (x = 0, shifter = 0; x < 8; x++, shifter += 2) {
498 *s->pixel_ptr++ = P[(flags >> shifter) & 0x03];
500 s->pixel_ptr += s->line_inc;
503 } else if ((P[0] <= P[1]) && (P[2] > P[3])) {
505 /* 1 of 4 colors for each 2x2 block, need 4 more bytes */
508 flags = bytestream_get_le32(&s->stream_ptr);
511 for (y = 0; y < 8; y += 2) {
512 for (x = 0; x < 8; x += 2, shifter += 2) {
513 pix = P[(flags >> shifter) & 0x03];
514 *(s->pixel_ptr + x) = pix;
515 *(s->pixel_ptr + x + 1) = pix;
516 *(s->pixel_ptr + s->stride + x) = pix;
517 *(s->pixel_ptr + s->stride + x + 1) = pix;
519 s->pixel_ptr += s->stride * 2;
522 } else if ((P[0] > P[1]) && (P[2] <= P[3])) {
524 /* 1 of 4 colors for each 2x1 block, need 8 more bytes */
527 for (y = 0; y < 8; y++) {
528 /* time to reload flags? */
529 if ((y == 0) || (y == 4)) {
530 flags = bytestream_get_le32(&s->stream_ptr);
533 for (x = 0; x < 8; x += 2, shifter += 2) {
534 pix = P[(flags >> shifter) & 0x03];
535 *(s->pixel_ptr + x) = pix;
536 *(s->pixel_ptr + x + 1) = pix;
538 s->pixel_ptr += s->stride;
543 /* 1 of 4 colors for each 1x2 block, need 8 more bytes */
546 for (y = 0; y < 8; y += 2) {
547 /* time to reload flags? */
548 if ((y == 0) || (y == 4)) {
549 flags = bytestream_get_le32(&s->stream_ptr);
552 for (x = 0; x < 8; x++, shifter += 2) {
553 pix = P[(flags >> shifter) & 0x03];
554 *(s->pixel_ptr + x) = pix;
555 *(s->pixel_ptr + s->stride + x) = pix;
557 s->pixel_ptr += s->stride * 2;
565 static int ipvideo_decode_block_opcode_0xA(IpvideoContext *s)
576 /* 4-color encoding for each 4x4 quadrant, or 4-color encoding on
577 * either top and bottom or left and right halves */
580 for (y = 0; y < 4; y++)
581 P[y] = *s->stream_ptr++;
585 /* 4-color encoding for each quadrant; need 28 more bytes */
586 CHECK_STREAM_PTR(28);
588 for (y = 0; y < 4; y++)
589 B[y] = *s->stream_ptr++;
590 for (y = 4; y < 16; y += 4) {
591 for (x = y; x < y + 4; x++)
592 P[x] = *s->stream_ptr++;
593 for (x = y; x < y + 4; x++)
594 B[x] = *s->stream_ptr++;
597 for (y = 0; y < 8; y++) {
599 lower_half = (y >= 4) ? 4 : 0;
600 flags = (B[y + 8] << 8) | B[y];
602 for (x = 0, shifter = 0; x < 8; x++, shifter += 2) {
603 split = (x >= 4) ? 8 : 0;
604 index = split + lower_half + ((flags >> shifter) & 0x03);
605 *s->pixel_ptr++ = P[index];
608 s->pixel_ptr += s->line_inc;
613 /* 4-color encoding for either left and right or top and bottom
614 * halves; need 20 more bytes */
615 CHECK_STREAM_PTR(20);
617 for (y = 0; y < 8; y++)
618 B[y] = *s->stream_ptr++;
619 for (y = 4; y < 8; y++)
620 P[y] = *s->stream_ptr++;
621 for (y = 8; y < 16; y++)
622 B[y] = *s->stream_ptr++;
626 /* block is divided into left and right halves */
627 for (y = 0; y < 8; y++) {
629 flags = (B[y + 8] << 8) | B[y];
632 for (x = 0, shifter = 0; x < 8; x++, shifter += 2) {
635 *s->pixel_ptr++ = P[split + ((flags >> shifter) & 0x03)];
638 s->pixel_ptr += s->line_inc;
643 /* block is divided into top and bottom halves */
645 for (y = 0; y < 8; y++) {
647 flags = (B[y * 2 + 1] << 8) | B[y * 2];
651 for (x = 0, shifter = 0; x < 8; x++, shifter += 2)
652 *s->pixel_ptr++ = P[split + ((flags >> shifter) & 0x03)];
654 s->pixel_ptr += s->line_inc;
663 static int ipvideo_decode_block_opcode_0xB(IpvideoContext *s)
667 /* 64-color encoding (each pixel in block is a different color) */
668 CHECK_STREAM_PTR(64);
670 for (y = 0; y < 8; y++) {
671 for (x = 0; x < 8; x++) {
672 *s->pixel_ptr++ = *s->stream_ptr++;
674 s->pixel_ptr += s->line_inc;
681 static int ipvideo_decode_block_opcode_0xC(IpvideoContext *s)
686 /* 16-color block encoding: each 2x2 block is a different color */
687 CHECK_STREAM_PTR(16);
689 for (y = 0; y < 8; y += 2) {
690 for (x = 0; x < 8; x += 2) {
691 pix = *s->stream_ptr++;
692 *(s->pixel_ptr + x) = pix;
693 *(s->pixel_ptr + x + 1) = pix;
694 *(s->pixel_ptr + s->stride + x) = pix;
695 *(s->pixel_ptr + s->stride + x + 1) = pix;
697 s->pixel_ptr += s->stride * 2;
704 static int ipvideo_decode_block_opcode_0xD(IpvideoContext *s)
708 unsigned char index = 0;
710 /* 4-color block encoding: each 4x4 block is a different color */
713 for (y = 0; y < 4; y++)
714 P[y] = *s->stream_ptr++;
716 for (y = 0; y < 8; y++) {
722 for (x = 0; x < 8; x++) {
725 *s->pixel_ptr++ = P[index];
727 s->pixel_ptr += s->line_inc;
734 static int ipvideo_decode_block_opcode_0xE(IpvideoContext *s)
739 /* 1-color encoding: the whole block is 1 solid color */
741 pix = *s->stream_ptr++;
743 for (y = 0; y < 8; y++) {
744 for (x = 0; x < 8; x++) {
745 *s->pixel_ptr++ = pix;
747 s->pixel_ptr += s->line_inc;
754 static int ipvideo_decode_block_opcode_0xF(IpvideoContext *s)
757 unsigned char sample0, sample1;
759 /* dithered encoding */
761 sample0 = *s->stream_ptr++;
762 sample1 = *s->stream_ptr++;
764 for (y = 0; y < 8; y++) {
765 for (x = 0; x < 8; x += 2) {
767 *s->pixel_ptr++ = sample1;
768 *s->pixel_ptr++ = sample0;
770 *s->pixel_ptr++ = sample0;
771 *s->pixel_ptr++ = sample1;
774 s->pixel_ptr += s->line_inc;
781 static int (*ipvideo_decode_block[16])(IpvideoContext *s);
783 static void ipvideo_decode_opcodes(IpvideoContext *s)
787 unsigned char opcode;
790 static int frame = 0;
792 debug_interplay("------------------ frame %d\n", frame);
795 for (x = 0; x < 16; x++)
798 /* this is PAL8, so make the palette available */
799 memcpy(s->current_frame.data[1], s->avctx->palctrl->palette, PALETTE_COUNT * 4);
801 s->stride = s->current_frame.linesize[0];
802 s->stream_ptr = s->buf + 14; /* data starts 14 bytes in */
803 s->stream_end = s->buf + s->size;
804 s->line_inc = s->stride - 8;
805 s->upper_motion_limit_offset = (s->avctx->height - 8) * s->stride
806 + s->avctx->width - 8;
808 for (y = 0; y < (s->stride * s->avctx->height); y += s->stride * 8) {
809 for (x = y; x < y + s->avctx->width; x += 8) {
810 /* bottom nibble first, then top nibble (which makes it
811 * hard to use a GetBitcontext) */
813 opcode = s->decoding_map[index >> 1] >> 4;
815 opcode = s->decoding_map[index >> 1] & 0xF;
818 debug_interplay(" block @ (%3d, %3d): encoding 0x%X, data ptr @ %p\n",
819 x - y, y / s->stride, opcode, s->stream_ptr);
820 code_counts[opcode]++;
822 s->pixel_ptr = s->current_frame.data[0] + x;
823 ret = ipvideo_decode_block[opcode](s);
825 av_log(s->avctx, AV_LOG_ERROR, " Interplay video: decode problem on frame %d, @ block (%d, %d)\n",
826 frame, x - y, y / s->stride);
831 if ((s->stream_ptr != s->stream_end) &&
832 (s->stream_ptr + 1 != s->stream_end)) {
833 av_log(s->avctx, AV_LOG_ERROR, " Interplay video: decode finished with %td bytes left over\n",
834 s->stream_end - s->stream_ptr);
838 static av_cold int ipvideo_decode_init(AVCodecContext *avctx)
840 IpvideoContext *s = avctx->priv_data;
844 if (s->avctx->palctrl == NULL) {
845 av_log(avctx, AV_LOG_ERROR, " Interplay video: palette expected.\n");
849 avctx->pix_fmt = PIX_FMT_PAL8;
850 dsputil_init(&s->dsp, avctx);
852 /* decoding map contains 4 bits of information per 8x8 block */
853 s->decoding_map_size = avctx->width * avctx->height / (8 * 8 * 2);
855 /* assign block decode functions */
856 ipvideo_decode_block[0x0] = ipvideo_decode_block_opcode_0x0;
857 ipvideo_decode_block[0x1] = ipvideo_decode_block_opcode_0x1;
858 ipvideo_decode_block[0x2] = ipvideo_decode_block_opcode_0x2;
859 ipvideo_decode_block[0x3] = ipvideo_decode_block_opcode_0x3;
860 ipvideo_decode_block[0x4] = ipvideo_decode_block_opcode_0x4;
861 ipvideo_decode_block[0x5] = ipvideo_decode_block_opcode_0x5;
862 ipvideo_decode_block[0x6] = ipvideo_decode_block_opcode_0x6;
863 ipvideo_decode_block[0x7] = ipvideo_decode_block_opcode_0x7;
864 ipvideo_decode_block[0x8] = ipvideo_decode_block_opcode_0x8;
865 ipvideo_decode_block[0x9] = ipvideo_decode_block_opcode_0x9;
866 ipvideo_decode_block[0xA] = ipvideo_decode_block_opcode_0xA;
867 ipvideo_decode_block[0xB] = ipvideo_decode_block_opcode_0xB;
868 ipvideo_decode_block[0xC] = ipvideo_decode_block_opcode_0xC;
869 ipvideo_decode_block[0xD] = ipvideo_decode_block_opcode_0xD;
870 ipvideo_decode_block[0xE] = ipvideo_decode_block_opcode_0xE;
871 ipvideo_decode_block[0xF] = ipvideo_decode_block_opcode_0xF;
873 s->current_frame.data[0] = s->last_frame.data[0] =
874 s->second_last_frame.data[0] = NULL;
879 static int ipvideo_decode_frame(AVCodecContext *avctx,
880 void *data, int *data_size,
881 const uint8_t *buf, int buf_size)
883 IpvideoContext *s = avctx->priv_data;
884 AVPaletteControl *palette_control = avctx->palctrl;
886 /* compressed buffer needs to be large enough to at least hold an entire
888 if (buf_size < s->decoding_map_size)
891 s->decoding_map = buf;
892 s->buf = buf + s->decoding_map_size;
893 s->size = buf_size - s->decoding_map_size;
895 s->current_frame.reference = 3;
896 if (avctx->get_buffer(avctx, &s->current_frame)) {
897 av_log(avctx, AV_LOG_ERROR, " Interplay Video: get_buffer() failed\n");
901 ipvideo_decode_opcodes(s);
903 if (palette_control->palette_changed) {
904 palette_control->palette_changed = 0;
905 s->current_frame.palette_has_changed = 1;
908 *data_size = sizeof(AVFrame);
909 *(AVFrame*)data = s->current_frame;
912 if (s->second_last_frame.data[0])
913 avctx->release_buffer(avctx, &s->second_last_frame);
914 s->second_last_frame = s->last_frame;
915 s->last_frame = s->current_frame;
916 s->current_frame.data[0] = NULL; /* catch any access attempts */
918 /* report that the buffer was completely consumed */
922 static av_cold int ipvideo_decode_end(AVCodecContext *avctx)
924 IpvideoContext *s = avctx->priv_data;
926 /* release the last frame */
927 if (s->last_frame.data[0])
928 avctx->release_buffer(avctx, &s->last_frame);
929 if (s->second_last_frame.data[0])
930 avctx->release_buffer(avctx, &s->second_last_frame);
935 AVCodec interplay_video_decoder = {
938 CODEC_ID_INTERPLAY_VIDEO,
939 sizeof(IpvideoContext),
943 ipvideo_decode_frame,
945 .long_name = NULL_IF_CONFIG_SMALL("Interplay MVE video"),