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;
271 /* 2-color encoding */
274 P0 = *s->stream_ptr++;
275 P1 = *s->stream_ptr++;
279 /* need 8 more bytes from the stream */
282 for (y = 0; y < 8; y++) {
283 flags = *s->stream_ptr++;
284 for (x = 0x01; x <= 0x80; x <<= 1) {
286 *s->pixel_ptr++ = P1;
288 *s->pixel_ptr++ = P0;
290 s->pixel_ptr += s->line_inc;
295 /* need 2 more bytes from the stream */
298 flags = bytestream_get_le16(&s->stream_ptr);
300 for (y = 0; y < 8; y += 2) {
301 for (x = 0; x < 8; x += 2, bitmask <<= 1) {
302 if (flags & bitmask) {
303 *(s->pixel_ptr + x) = P1;
304 *(s->pixel_ptr + x + 1) = P1;
305 *(s->pixel_ptr + s->stride + x) = P1;
306 *(s->pixel_ptr + s->stride + x + 1) = P1;
308 *(s->pixel_ptr + x) = P0;
309 *(s->pixel_ptr + x + 1) = P0;
310 *(s->pixel_ptr + s->stride + x) = P0;
311 *(s->pixel_ptr + s->stride + x + 1) = P0;
314 s->pixel_ptr += s->stride * 2;
322 static int ipvideo_decode_block_opcode_0x8(IpvideoContext *s)
327 unsigned int flags = 0;
328 unsigned int bitmask = 0;
329 unsigned char P0 = 0, P1 = 0;
332 /* 2-color encoding for each 4x4 quadrant, or 2-color encoding on
333 * either top and bottom or left and right halves */
336 P[0] = *s->stream_ptr++;
337 P[1] = *s->stream_ptr++;
341 /* need 12 more bytes */
342 CHECK_STREAM_PTR(12);
343 B[0] = *s->stream_ptr++; B[1] = *s->stream_ptr++;
344 P[2] = *s->stream_ptr++; P[3] = *s->stream_ptr++;
345 B[2] = *s->stream_ptr++; B[3] = *s->stream_ptr++;
346 P[4] = *s->stream_ptr++; P[5] = *s->stream_ptr++;
347 B[4] = *s->stream_ptr++; B[5] = *s->stream_ptr++;
348 P[6] = *s->stream_ptr++; P[7] = *s->stream_ptr++;
349 B[6] = *s->stream_ptr++; B[7] = *s->stream_ptr++;
351 for (y = 0; y < 8; y++) {
353 /* time to reload flags? */
356 ((B[0] & 0xF0) << 4) | ((B[4] & 0xF0) << 8) |
357 ((B[0] & 0x0F) ) | ((B[4] & 0x0F) << 4) |
358 ((B[1] & 0xF0) << 20) | ((B[5] & 0xF0) << 24) |
359 ((B[1] & 0x0F) << 16) | ((B[5] & 0x0F) << 20);
360 bitmask = 0x00000001;
361 lower_half = 0; /* still on top half */
364 ((B[2] & 0xF0) << 4) | ((B[6] & 0xF0) << 8) |
365 ((B[2] & 0x0F) ) | ((B[6] & 0x0F) << 4) |
366 ((B[3] & 0xF0) << 20) | ((B[7] & 0xF0) << 24) |
367 ((B[3] & 0x0F) << 16) | ((B[7] & 0x0F) << 20);
368 bitmask = 0x00000001;
372 for (x = 0; x < 8; x++, bitmask <<= 1) {
373 /* get the pixel values ready for this quadrant */
375 P0 = P[lower_half + 0];
376 P1 = P[lower_half + 1];
378 P0 = P[lower_half + 4];
379 P1 = P[lower_half + 5];
383 *s->pixel_ptr++ = P1;
385 *s->pixel_ptr++ = P0;
387 s->pixel_ptr += s->line_inc;
392 /* need 10 more bytes */
393 CHECK_STREAM_PTR(10);
394 B[0] = *s->stream_ptr++; B[1] = *s->stream_ptr++;
395 B[2] = *s->stream_ptr++; B[3] = *s->stream_ptr++;
396 P[2] = *s->stream_ptr++; P[3] = *s->stream_ptr++;
397 B[4] = *s->stream_ptr++; B[5] = *s->stream_ptr++;
398 B[6] = *s->stream_ptr++; B[7] = *s->stream_ptr++;
402 /* vertical split; left & right halves are 2-color encoded */
404 for (y = 0; y < 8; y++) {
406 /* time to reload flags? */
409 ((B[0] & 0xF0) << 4) | ((B[4] & 0xF0) << 8) |
410 ((B[0] & 0x0F) ) | ((B[4] & 0x0F) << 4) |
411 ((B[1] & 0xF0) << 20) | ((B[5] & 0xF0) << 24) |
412 ((B[1] & 0x0F) << 16) | ((B[5] & 0x0F) << 20);
413 bitmask = 0x00000001;
416 ((B[2] & 0xF0) << 4) | ((B[6] & 0xF0) << 8) |
417 ((B[2] & 0x0F) ) | ((B[6] & 0x0F) << 4) |
418 ((B[3] & 0xF0) << 20) | ((B[7] & 0xF0) << 24) |
419 ((B[3] & 0x0F) << 16) | ((B[7] & 0x0F) << 20);
420 bitmask = 0x00000001;
423 for (x = 0; x < 8; x++, bitmask <<= 1) {
424 /* get the pixel values ready for this half */
434 *s->pixel_ptr++ = P1;
436 *s->pixel_ptr++ = P0;
438 s->pixel_ptr += s->line_inc;
443 /* horizontal split; top & bottom halves are 2-color encoded */
445 for (y = 0; y < 8; y++) {
456 for (bitmask = 0x01; bitmask <= 0x80; bitmask <<= 1) {
459 *s->pixel_ptr++ = P1;
461 *s->pixel_ptr++ = P0;
463 s->pixel_ptr += s->line_inc;
472 static int ipvideo_decode_block_opcode_0x9(IpvideoContext *s)
476 unsigned int flags = 0;
480 /* 4-color encoding */
483 memcpy(P, s->stream_ptr, 4);
486 if ((P[0] <= P[1]) && (P[2] <= P[3])) {
488 /* 1 of 4 colors for each pixel, need 16 more bytes */
489 CHECK_STREAM_PTR(16);
491 for (y = 0; y < 8; y++) {
492 /* get the next set of 8 2-bit flags */
493 flags = bytestream_get_le16(&s->stream_ptr);
494 for (x = 0, shifter = 0; x < 8; x++, shifter += 2) {
495 *s->pixel_ptr++ = P[(flags >> shifter) & 0x03];
497 s->pixel_ptr += s->line_inc;
500 } else if ((P[0] <= P[1]) && (P[2] > P[3])) {
502 /* 1 of 4 colors for each 2x2 block, need 4 more bytes */
505 flags = bytestream_get_le32(&s->stream_ptr);
508 for (y = 0; y < 8; y += 2) {
509 for (x = 0; x < 8; x += 2, shifter += 2) {
510 pix = P[(flags >> shifter) & 0x03];
511 *(s->pixel_ptr + x) = pix;
512 *(s->pixel_ptr + x + 1) = pix;
513 *(s->pixel_ptr + s->stride + x) = pix;
514 *(s->pixel_ptr + s->stride + x + 1) = pix;
516 s->pixel_ptr += s->stride * 2;
519 } else if ((P[0] > P[1]) && (P[2] <= P[3])) {
521 /* 1 of 4 colors for each 2x1 block, need 8 more bytes */
524 for (y = 0; y < 8; y++) {
525 /* time to reload flags? */
526 if ((y == 0) || (y == 4)) {
527 flags = bytestream_get_le32(&s->stream_ptr);
530 for (x = 0; x < 8; x += 2, shifter += 2) {
531 pix = P[(flags >> shifter) & 0x03];
532 *(s->pixel_ptr + x) = pix;
533 *(s->pixel_ptr + x + 1) = pix;
535 s->pixel_ptr += s->stride;
540 /* 1 of 4 colors for each 1x2 block, need 8 more bytes */
543 for (y = 0; y < 8; y += 2) {
544 /* time to reload flags? */
545 if ((y == 0) || (y == 4)) {
546 flags = bytestream_get_le32(&s->stream_ptr);
549 for (x = 0; x < 8; x++, shifter += 2) {
550 pix = P[(flags >> shifter) & 0x03];
551 *(s->pixel_ptr + x) = pix;
552 *(s->pixel_ptr + s->stride + x) = pix;
554 s->pixel_ptr += s->stride * 2;
562 static int ipvideo_decode_block_opcode_0xA(IpvideoContext *s)
573 /* 4-color encoding for each 4x4 quadrant, or 4-color encoding on
574 * either top and bottom or left and right halves */
577 memcpy(P, s->stream_ptr, 4);
582 /* 4-color encoding for each quadrant; need 28 more bytes */
583 CHECK_STREAM_PTR(28);
585 memcpy(B, s->stream_ptr, 4);
587 for (y = 4; y < 16; y += 4) {
588 memcpy(P + y, s->stream_ptr, 4);
590 memcpy(B + y, s->stream_ptr, 4);
594 for (y = 0; y < 8; y++) {
596 lower_half = (y >= 4) ? 4 : 0;
597 flags = (B[y + 8] << 8) | B[y];
599 for (x = 0, shifter = 0; x < 8; x++, shifter += 2) {
600 split = (x >= 4) ? 8 : 0;
601 index = split + lower_half + ((flags >> shifter) & 0x03);
602 *s->pixel_ptr++ = P[index];
605 s->pixel_ptr += s->line_inc;
610 /* 4-color encoding for either left and right or top and bottom
611 * halves; need 20 more bytes */
612 CHECK_STREAM_PTR(20);
614 memcpy(B, s->stream_ptr, 8);
616 memcpy(P + 4, s->stream_ptr, 4);
618 memcpy(B + 8, s->stream_ptr, 8);
623 /* block is divided into left and right halves */
624 for (y = 0; y < 8; y++) {
626 flags = (B[y + 8] << 8) | B[y];
629 for (x = 0, shifter = 0; x < 8; x++, shifter += 2) {
632 *s->pixel_ptr++ = P[split + ((flags >> shifter) & 0x03)];
635 s->pixel_ptr += s->line_inc;
640 /* block is divided into top and bottom halves */
642 for (y = 0; y < 8; y++) {
644 flags = (B[y * 2 + 1] << 8) | B[y * 2];
648 for (x = 0, shifter = 0; x < 8; x++, shifter += 2)
649 *s->pixel_ptr++ = P[split + ((flags >> shifter) & 0x03)];
651 s->pixel_ptr += s->line_inc;
660 static int ipvideo_decode_block_opcode_0xB(IpvideoContext *s)
664 /* 64-color encoding (each pixel in block is a different color) */
665 CHECK_STREAM_PTR(64);
667 for (y = 0; y < 8; y++) {
668 memcpy(s->pixel_ptr, s->stream_ptr, 8);
670 s->pixel_ptr += s->stride;
677 static int ipvideo_decode_block_opcode_0xC(IpvideoContext *s)
682 /* 16-color block encoding: each 2x2 block is a different color */
683 CHECK_STREAM_PTR(16);
685 for (y = 0; y < 8; y += 2) {
686 for (x = 0; x < 8; x += 2) {
687 pix = *s->stream_ptr++;
688 *(s->pixel_ptr + x) = pix;
689 *(s->pixel_ptr + x + 1) = pix;
690 *(s->pixel_ptr + s->stride + x) = pix;
691 *(s->pixel_ptr + s->stride + x + 1) = pix;
693 s->pixel_ptr += s->stride * 2;
700 static int ipvideo_decode_block_opcode_0xD(IpvideoContext *s)
704 unsigned char index = 0;
706 /* 4-color block encoding: each 4x4 block is a different color */
709 memcpy(P, s->stream_ptr, 4);
712 for (y = 0; y < 8; y++) {
718 memset(s->pixel_ptr , P[index ], 4);
719 memset(s->pixel_ptr + 4, P[index + 1], 4);
720 s->pixel_ptr += s->stride;
727 static int ipvideo_decode_block_opcode_0xE(IpvideoContext *s)
732 /* 1-color encoding: the whole block is 1 solid color */
734 pix = *s->stream_ptr++;
736 for (y = 0; y < 8; y++) {
737 memset(s->pixel_ptr, pix, 8);
738 s->pixel_ptr += s->stride;
745 static int ipvideo_decode_block_opcode_0xF(IpvideoContext *s)
748 unsigned char sample0, sample1;
750 /* dithered encoding */
752 sample0 = *s->stream_ptr++;
753 sample1 = *s->stream_ptr++;
755 for (y = 0; y < 8; y++) {
756 for (x = 0; x < 8; x += 2) {
758 *s->pixel_ptr++ = sample1;
759 *s->pixel_ptr++ = sample0;
761 *s->pixel_ptr++ = sample0;
762 *s->pixel_ptr++ = sample1;
765 s->pixel_ptr += s->line_inc;
772 static int (* const ipvideo_decode_block[])(IpvideoContext *s) = {
773 ipvideo_decode_block_opcode_0x0, ipvideo_decode_block_opcode_0x1,
774 ipvideo_decode_block_opcode_0x2, ipvideo_decode_block_opcode_0x3,
775 ipvideo_decode_block_opcode_0x4, ipvideo_decode_block_opcode_0x5,
776 ipvideo_decode_block_opcode_0x6, ipvideo_decode_block_opcode_0x7,
777 ipvideo_decode_block_opcode_0x8, ipvideo_decode_block_opcode_0x9,
778 ipvideo_decode_block_opcode_0xA, ipvideo_decode_block_opcode_0xB,
779 ipvideo_decode_block_opcode_0xC, ipvideo_decode_block_opcode_0xD,
780 ipvideo_decode_block_opcode_0xE, ipvideo_decode_block_opcode_0xF,
783 static void ipvideo_decode_opcodes(IpvideoContext *s)
787 unsigned char opcode;
789 int code_counts[16] = {0};
790 static int frame = 0;
792 debug_interplay("------------------ frame %d\n", frame);
795 /* this is PAL8, so make the palette available */
796 memcpy(s->current_frame.data[1], s->avctx->palctrl->palette, PALETTE_COUNT * 4);
798 s->stride = s->current_frame.linesize[0];
799 s->stream_ptr = s->buf + 14; /* data starts 14 bytes in */
800 s->stream_end = s->buf + s->size;
801 s->line_inc = s->stride - 8;
802 s->upper_motion_limit_offset = (s->avctx->height - 8) * s->stride
803 + s->avctx->width - 8;
805 for (y = 0; y < (s->stride * s->avctx->height); y += s->stride * 8) {
806 for (x = y; x < y + s->avctx->width; x += 8) {
807 /* bottom nibble first, then top nibble (which makes it
808 * hard to use a GetBitcontext) */
810 opcode = s->decoding_map[index >> 1] >> 4;
812 opcode = s->decoding_map[index >> 1] & 0xF;
815 debug_interplay(" block @ (%3d, %3d): encoding 0x%X, data ptr @ %p\n",
816 x - y, y / s->stride, opcode, s->stream_ptr);
817 code_counts[opcode]++;
819 s->pixel_ptr = s->current_frame.data[0] + x;
820 ret = ipvideo_decode_block[opcode](s);
822 av_log(s->avctx, AV_LOG_ERROR, " Interplay video: decode problem on frame %d, @ block (%d, %d)\n",
823 frame, x - y, y / s->stride);
828 if ((s->stream_ptr != s->stream_end) &&
829 (s->stream_ptr + 1 != s->stream_end)) {
830 av_log(s->avctx, AV_LOG_ERROR, " Interplay video: decode finished with %td bytes left over\n",
831 s->stream_end - s->stream_ptr);
835 static av_cold int ipvideo_decode_init(AVCodecContext *avctx)
837 IpvideoContext *s = avctx->priv_data;
841 if (s->avctx->palctrl == NULL) {
842 av_log(avctx, AV_LOG_ERROR, " Interplay video: palette expected.\n");
846 avctx->pix_fmt = PIX_FMT_PAL8;
847 dsputil_init(&s->dsp, avctx);
849 /* decoding map contains 4 bits of information per 8x8 block */
850 s->decoding_map_size = avctx->width * avctx->height / (8 * 8 * 2);
852 s->current_frame.data[0] = s->last_frame.data[0] =
853 s->second_last_frame.data[0] = NULL;
858 static int ipvideo_decode_frame(AVCodecContext *avctx,
859 void *data, int *data_size,
860 const uint8_t *buf, int buf_size)
862 IpvideoContext *s = avctx->priv_data;
863 AVPaletteControl *palette_control = avctx->palctrl;
865 /* compressed buffer needs to be large enough to at least hold an entire
867 if (buf_size < s->decoding_map_size)
870 s->decoding_map = buf;
871 s->buf = buf + s->decoding_map_size;
872 s->size = buf_size - s->decoding_map_size;
874 s->current_frame.reference = 3;
875 if (avctx->get_buffer(avctx, &s->current_frame)) {
876 av_log(avctx, AV_LOG_ERROR, " Interplay Video: get_buffer() failed\n");
880 ipvideo_decode_opcodes(s);
882 if (palette_control->palette_changed) {
883 palette_control->palette_changed = 0;
884 s->current_frame.palette_has_changed = 1;
887 *data_size = sizeof(AVFrame);
888 *(AVFrame*)data = s->current_frame;
891 if (s->second_last_frame.data[0])
892 avctx->release_buffer(avctx, &s->second_last_frame);
893 s->second_last_frame = s->last_frame;
894 s->last_frame = s->current_frame;
895 s->current_frame.data[0] = NULL; /* catch any access attempts */
897 /* report that the buffer was completely consumed */
901 static av_cold int ipvideo_decode_end(AVCodecContext *avctx)
903 IpvideoContext *s = avctx->priv_data;
905 /* release the last frame */
906 if (s->last_frame.data[0])
907 avctx->release_buffer(avctx, &s->last_frame);
908 if (s->second_last_frame.data[0])
909 avctx->release_buffer(avctx, &s->second_last_frame);
914 AVCodec interplay_video_decoder = {
917 CODEC_ID_INTERPLAY_VIDEO,
918 sizeof(IpvideoContext),
922 ipvideo_decode_frame,
924 .long_name = NULL_IF_CONFIG_SMALL("Interplay MVE video"),