FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/interplayvideo.c
Date: 2025-06-30 14:39:11
Exec Total Coverage
Lines: 452 633 71.4%
Functions: 28 36 77.8%
Branches: 259 366 70.8%
Line Branch Exec Source
1 /*
2 * Interplay MVE Video Decoder
3 * Copyright (C) 2003 The FFmpeg project
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22 /**
23 * @file
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.
29 *
30 * This decoder presently only supports a PAL8 output colorspace.
31 *
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.
35 */
36
37 #include <stdio.h>
38 #include <string.h>
39
40 #include "libavutil/intreadwrite.h"
41
42 #define BITSTREAM_READER_LE
43 #include "avcodec.h"
44 #include "bytestream.h"
45 #include "codec_internal.h"
46 #include "decode.h"
47 #include "get_bits.h"
48 #include "hpeldsp.h"
49
50 #define PALETTE_COUNT 256
51
52 typedef struct IpvideoContext {
53
54 AVCodecContext *avctx;
55 HpelDSPContext hdsp;
56 AVFrame *second_last_frame;
57 AVFrame *last_frame;
58
59 /* For format 0x10 */
60 AVFrame *cur_decode_frame;
61 AVFrame *prev_decode_frame;
62
63 const unsigned char *decoding_map;
64 int decoding_map_size;
65 const unsigned char *skip_map;
66 int skip_map_size;
67
68 int is_16bpp;
69 GetByteContext stream_ptr, mv_ptr;
70 unsigned char *pixel_ptr;
71 int line_inc;
72 int stride;
73 int upper_motion_limit_offset;
74
75 uint32_t pal[256];
76 } IpvideoContext;
77
78 341521 static int copy_from(IpvideoContext *s, AVFrame *src, AVFrame *dst, int delta_x, int delta_y)
79 {
80 341521 int width = dst->width;
81 341521 int current_offset = s->pixel_ptr - dst->data[0];
82 341521 int x = (current_offset % dst->linesize[0]) / (1 + s->is_16bpp);
83 341521 int y = current_offset / dst->linesize[0];
84 341521 int dx = delta_x + x - ((delta_x + x >= width) - (delta_x + x < 0)) * width;
85 341521 int dy = delta_y + y + (delta_x + x >= width) - (delta_x + x < 0);
86 341521 int motion_offset = dy * src->linesize[0] + dx * (1 + s->is_16bpp);
87
88
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 341521 if (motion_offset < 0) {
89 ✗ av_log(s->avctx, AV_LOG_ERROR, "motion offset < 0 (%d)\n", motion_offset);
90 ✗ return AVERROR_INVALIDDATA;
91
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 341521 } else if (motion_offset > s->upper_motion_limit_offset) {
92 ✗ av_log(s->avctx, AV_LOG_ERROR, "motion offset above limit (%d >= %d)\n",
93 motion_offset, s->upper_motion_limit_offset);
94 ✗ return AVERROR_INVALIDDATA;
95 }
96
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 341521 if (!src->data[0]) {
97 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid decode type, corrupted header?\n");
98 ✗ return AVERROR(EINVAL);
99 }
100 341521 s->hdsp.put_pixels_tab[!s->is_16bpp][0](s->pixel_ptr, src->data[0] + motion_offset,
101 341521 dst->linesize[0], 8);
102 341521 return 0;
103 }
104
105 34551 static int ipvideo_decode_block_opcode_0x0(IpvideoContext *s, AVFrame *frame)
106 {
107 34551 return copy_from(s, s->last_frame, frame, 0, 0);
108 }
109
110 280419 static int ipvideo_decode_block_opcode_0x1(IpvideoContext *s, AVFrame *frame)
111 {
112 280419 return copy_from(s, s->second_last_frame, frame, 0, 0);
113 }
114
115 1282 static int ipvideo_decode_block_opcode_0x2(IpvideoContext *s, AVFrame *frame)
116 {
117 unsigned char B;
118 int x, y;
119
120 /* copy block from 2 frames ago using a motion vector; need 1 more byte */
121
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 1282 if (!s->is_16bpp) {
122 579 B = bytestream2_get_byte(&s->stream_ptr);
123 } else {
124 703 B = bytestream2_get_byte(&s->mv_ptr);
125 }
126
127
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 1282 if (B < 56) {
128 491 x = 8 + (B % 7);
129 491 y = B / 7;
130 } else {
131 791 x = -14 + ((B - 56) % 29);
132 791 y = 8 + ((B - 56) / 29);
133 }
134
135 ff_tlog(s->avctx, "motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
136 1282 return copy_from(s, s->second_last_frame, frame, x, y);
137 }
138
139 3043 static int ipvideo_decode_block_opcode_0x3(IpvideoContext *s, AVFrame *frame)
140 {
141 unsigned char B;
142 int x, y;
143
144 /* copy 8x8 block from current frame from an up/left block */
145
146 /* need 1 more byte for motion */
147
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 3043 if (!s->is_16bpp) {
148 387 B = bytestream2_get_byte(&s->stream_ptr);
149 } else {
150 2656 B = bytestream2_get_byte(&s->mv_ptr);
151 }
152
153
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 3043 if (B < 56) {
154 1630 x = -(8 + (B % 7));
155 1630 y = -(B / 7);
156 } else {
157 1413 x = -(-14 + ((B - 56) % 29));
158 1413 y = -( 8 + ((B - 56) / 29));
159 }
160
161 ff_tlog(s->avctx, "motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
162 3043 return copy_from(s, frame, frame, x, y);
163 }
164
165 18863 static int ipvideo_decode_block_opcode_0x4(IpvideoContext *s, AVFrame *frame)
166 {
167 int x, y;
168 unsigned char B, BL, BH;
169
170 /* copy a block from the previous frame; need 1 more byte */
171
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 18863 if (!s->is_16bpp) {
172 6043 B = bytestream2_get_byte(&s->stream_ptr);
173 } else {
174 12820 B = bytestream2_get_byte(&s->mv_ptr);
175 }
176
177 18863 BL = B & 0x0F;
178 18863 BH = (B >> 4) & 0x0F;
179 18863 x = -8 + BL;
180 18863 y = -8 + BH;
181
182 ff_tlog(s->avctx, "motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
183 18863 return copy_from(s, s->last_frame, frame, x, y);
184 }
185
186 3363 static int ipvideo_decode_block_opcode_0x5(IpvideoContext *s, AVFrame *frame)
187 {
188 signed char x, y;
189
190 /* copy a block from the previous frame using an expanded range;
191 * need 2 more bytes */
192 3363 x = bytestream2_get_byte(&s->stream_ptr);
193 3363 y = bytestream2_get_byte(&s->stream_ptr);
194
195 ff_tlog(s->avctx, "motion bytes = %d, %d\n", x, y);
196 3363 return copy_from(s, s->last_frame, frame, x, y);
197 }
198
199 ✗ static int ipvideo_decode_block_opcode_0x6(IpvideoContext *s, AVFrame *frame)
200 {
201 /* mystery opcode? skip multiple blocks? */
202 ✗ av_log(s->avctx, AV_LOG_ERROR, "Help! Mystery opcode 0x6 seen\n");
203
204 /* report success */
205 ✗ return 0;
206 }
207
208 815 static int ipvideo_decode_block_opcode_0x7(IpvideoContext *s, AVFrame *frame)
209 {
210 int x, y;
211 unsigned char P[2];
212 unsigned int flags;
213
214
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 815 if (bytestream2_get_bytes_left(&s->stream_ptr) < 4) {
215 ✗ av_log(s->avctx, AV_LOG_ERROR, "too little data for opcode 0x7\n");
216 ✗ return AVERROR_INVALIDDATA;
217 }
218
219 /* 2-color encoding */
220 815 P[0] = bytestream2_get_byte(&s->stream_ptr);
221 815 P[1] = bytestream2_get_byte(&s->stream_ptr);
222
223
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 815 if (P[0] <= P[1]) {
224
225 /* need 8 more bytes from the stream */
226
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 6471 for (y = 0; y < 8; y++) {
227 5752 flags = bytestream2_get_byte(&s->stream_ptr) | 0x100;
228
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 51768 for (; flags != 1; flags >>= 1)
229 46016 *s->pixel_ptr++ = P[flags & 1];
230 5752 s->pixel_ptr += s->line_inc;
231 }
232
233 } else {
234
235 /* need 2 more bytes from the stream */
236 96 flags = bytestream2_get_le16(&s->stream_ptr);
237
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 480 for (y = 0; y < 8; y += 2) {
238
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 1920 for (x = 0; x < 8; x += 2, flags >>= 1) {
239 1536 s->pixel_ptr[x ] =
240 1536 s->pixel_ptr[x + 1 ] =
241 1536 s->pixel_ptr[x + s->stride] =
242 1536 s->pixel_ptr[x + 1 + s->stride] = P[flags & 1];
243 }
244 384 s->pixel_ptr += s->stride * 2;
245 }
246 }
247
248 /* report success */
249 815 return 0;
250 }
251
252 1013 static int ipvideo_decode_block_opcode_0x8(IpvideoContext *s, AVFrame *frame)
253 {
254 int x, y;
255 unsigned char P[4];
256 1013 unsigned int flags = 0;
257
258
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 1013 if (bytestream2_get_bytes_left(&s->stream_ptr) < 12) {
259 ✗ av_log(s->avctx, AV_LOG_ERROR, "too little data for opcode 0x8\n");
260 ✗ return AVERROR_INVALIDDATA;
261 }
262
263 /* 2-color encoding for each 4x4 quadrant, or 2-color encoding on
264 * either top and bottom or left and right halves */
265 1013 P[0] = bytestream2_get_byte(&s->stream_ptr);
266 1013 P[1] = bytestream2_get_byte(&s->stream_ptr);
267
268
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 1013 if (P[0] <= P[1]) {
269
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 5627 for (y = 0; y < 16; y++) {
270 // new values for each 4x4 block
271
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 5296 if (!(y & 3)) {
272
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 1324 if (y) {
273 993 P[0] = bytestream2_get_byte(&s->stream_ptr);
274 993 P[1] = bytestream2_get_byte(&s->stream_ptr);
275 }
276 1324 flags = bytestream2_get_le16(&s->stream_ptr);
277 }
278
279
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 26480 for (x = 0; x < 4; x++, flags >>= 1)
280 21184 *s->pixel_ptr++ = P[flags & 1];
281 5296 s->pixel_ptr += s->stride - 4;
282 // switch to right half
283
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 5296 if (y == 7) s->pixel_ptr -= 8 * s->stride - 4;
284 }
285
286 } else {
287 682 flags = bytestream2_get_le32(&s->stream_ptr);
288 682 P[2] = bytestream2_get_byte(&s->stream_ptr);
289 682 P[3] = bytestream2_get_byte(&s->stream_ptr);
290
291
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 682 if (P[2] <= P[3]) {
292
293 /* vertical split; left & right halves are 2-color encoded */
294
295
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 6919 for (y = 0; y < 16; y++) {
296
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 32560 for (x = 0; x < 4; x++, flags >>= 1)
297 26048 *s->pixel_ptr++ = P[flags & 1];
298 6512 s->pixel_ptr += s->stride - 4;
299 // switch to right half
300
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 6512 if (y == 7) {
301 407 s->pixel_ptr -= 8 * s->stride - 4;
302 407 P[0] = P[2];
303 407 P[1] = P[3];
304 407 flags = bytestream2_get_le32(&s->stream_ptr);
305 }
306 }
307
308 } else {
309
310 /* horizontal split; top & bottom halves are 2-color encoded */
311
312
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 2475 for (y = 0; y < 8; y++) {
313
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 2200 if (y == 4) {
314 275 P[0] = P[2];
315 275 P[1] = P[3];
316 275 flags = bytestream2_get_le32(&s->stream_ptr);
317 }
318
319
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 19800 for (x = 0; x < 8; x++, flags >>= 1)
320 17600 *s->pixel_ptr++ = P[flags & 1];
321 2200 s->pixel_ptr += s->line_inc;
322 }
323 }
324 }
325
326 /* report success */
327 1013 return 0;
328 }
329
330 2412 static int ipvideo_decode_block_opcode_0x9(IpvideoContext *s, AVFrame *frame)
331 {
332 int x, y;
333 unsigned char P[4];
334
335
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 2412 if (bytestream2_get_bytes_left(&s->stream_ptr) < 8) {
336 ✗ av_log(s->avctx, AV_LOG_ERROR, "too little data for opcode 0x9\n");
337 ✗ return AVERROR_INVALIDDATA;
338 }
339
340 /* 4-color encoding */
341 2412 bytestream2_get_buffer(&s->stream_ptr, P, 4);
342
343
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 2412 if (P[0] <= P[1]) {
344
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 2053 if (P[2] <= P[3]) {
345
346 /* 1 of 4 colors for each pixel, need 16 more bytes */
347
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 16515 for (y = 0; y < 8; y++) {
348 /* get the next set of 8 2-bit flags */
349 14680 int flags = bytestream2_get_le16(&s->stream_ptr);
350
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 132120 for (x = 0; x < 8; x++, flags >>= 2)
351 117440 *s->pixel_ptr++ = P[flags & 0x03];
352 14680 s->pixel_ptr += s->line_inc;
353 }
354
355 } else {
356 uint32_t flags;
357
358 /* 1 of 4 colors for each 2x2 block, need 4 more bytes */
359 218 flags = bytestream2_get_le32(&s->stream_ptr);
360
361
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 1090 for (y = 0; y < 8; y += 2) {
362
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 4360 for (x = 0; x < 8; x += 2, flags >>= 2) {
363 3488 s->pixel_ptr[x ] =
364 3488 s->pixel_ptr[x + 1 ] =
365 3488 s->pixel_ptr[x + s->stride] =
366 3488 s->pixel_ptr[x + 1 + s->stride] = P[flags & 0x03];
367 }
368 872 s->pixel_ptr += s->stride * 2;
369 }
370
371 }
372 } else {
373 uint64_t flags;
374
375 /* 1 of 4 colors for each 2x1 or 1x2 block, need 8 more bytes */
376 359 flags = bytestream2_get_le64(&s->stream_ptr);
377
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 359 if (P[2] <= P[3]) {
378
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 1755 for (y = 0; y < 8; y++) {
379
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 7800 for (x = 0; x < 8; x += 2, flags >>= 2) {
380 6240 s->pixel_ptr[x ] =
381 6240 s->pixel_ptr[x + 1] = P[flags & 0x03];
382 }
383 1560 s->pixel_ptr += s->stride;
384 }
385 } else {
386
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 820 for (y = 0; y < 8; y += 2) {
387
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 5904 for (x = 0; x < 8; x++, flags >>= 2) {
388 5248 s->pixel_ptr[x ] =
389 5248 s->pixel_ptr[x + s->stride] = P[flags & 0x03];
390 }
391 656 s->pixel_ptr += s->stride * 2;
392 }
393 }
394 }
395
396 /* report success */
397 2412 return 0;
398 }
399
400 5451 static int ipvideo_decode_block_opcode_0xA(IpvideoContext *s, AVFrame *frame)
401 {
402 int x, y;
403 unsigned char P[8];
404 5451 int flags = 0;
405
406
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 5451 if (bytestream2_get_bytes_left(&s->stream_ptr) < 16) {
407 ✗ av_log(s->avctx, AV_LOG_ERROR, "too little data for opcode 0xA\n");
408 ✗ return AVERROR_INVALIDDATA;
409 }
410
411 5451 bytestream2_get_buffer(&s->stream_ptr, P, 4);
412
413 /* 4-color encoding for each 4x4 quadrant, or 4-color encoding on
414 * either top and bottom or left and right halves */
415
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 5451 if (P[0] <= P[1]) {
416
417 /* 4-color encoding for each quadrant; need 32 bytes */
418
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 32419 for (y = 0; y < 16; y++) {
419 // new values for each 4x4 block
420
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 30512 if (!(y & 3)) {
421
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 7628 if (y) bytestream2_get_buffer(&s->stream_ptr, P, 4);
422 7628 flags = bytestream2_get_le32(&s->stream_ptr);
423 }
424
425
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 152560 for (x = 0; x < 4; x++, flags >>= 2)
426 122048 *s->pixel_ptr++ = P[flags & 0x03];
427
428 30512 s->pixel_ptr += s->stride - 4;
429 // switch to right half
430
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 30512 if (y == 7) s->pixel_ptr -= 8 * s->stride - 4;
431 }
432
433 } else {
434 // vertical split?
435 int vert;
436 3544 uint64_t flags = bytestream2_get_le64(&s->stream_ptr);
437
438 3544 bytestream2_get_buffer(&s->stream_ptr, P + 4, 4);
439 3544 vert = P[4] <= P[5];
440
441 /* 4-color encoding for either left and right or top and bottom
442 * halves */
443
444
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 60248 for (y = 0; y < 16; y++) {
445
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 283520 for (x = 0; x < 4; x++, flags >>= 2)
446 226816 *s->pixel_ptr++ = P[flags & 0x03];
447
448
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 56704 if (vert) {
449 30576 s->pixel_ptr += s->stride - 4;
450 // switch to right half
451
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 30576 if (y == 7) s->pixel_ptr -= 8 * s->stride - 4;
452
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 26128 } else if (y & 1) s->pixel_ptr += s->line_inc;
453
454 // load values for second half
455
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 56704 if (y == 7) {
456 3544 memcpy(P, P + 4, 4);
457 3544 flags = bytestream2_get_le64(&s->stream_ptr);
458 }
459 }
460 }
461
462 /* report success */
463 5451 return 0;
464 }
465
466 21074 static int ipvideo_decode_block_opcode_0xB(IpvideoContext *s, AVFrame *frame)
467 {
468 int y;
469
470 /* 64-color encoding (each pixel in block is a different color) */
471
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 189666 for (y = 0; y < 8; y++) {
472 168592 bytestream2_get_buffer(&s->stream_ptr, s->pixel_ptr, 8);
473 168592 s->pixel_ptr += s->stride;
474 }
475
476 /* report success */
477 21074 return 0;
478 }
479
480 135 static int ipvideo_decode_block_opcode_0xC(IpvideoContext *s, AVFrame *frame)
481 {
482 int x, y;
483
484 /* 16-color block encoding: each 2x2 block is a different color */
485
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 675 for (y = 0; y < 8; y += 2) {
486
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 2700 for (x = 0; x < 8; x += 2) {
487 2160 s->pixel_ptr[x ] =
488 2160 s->pixel_ptr[x + 1 ] =
489 2160 s->pixel_ptr[x + s->stride] =
490 2160 s->pixel_ptr[x + 1 + s->stride] = bytestream2_get_byte(&s->stream_ptr);
491 }
492 540 s->pixel_ptr += s->stride * 2;
493 }
494
495 /* report success */
496 135 return 0;
497 }
498
499 49 static int ipvideo_decode_block_opcode_0xD(IpvideoContext *s, AVFrame *frame)
500 {
501 int y;
502 unsigned char P[2];
503
504
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 49 if (bytestream2_get_bytes_left(&s->stream_ptr) < 4) {
505 ✗ av_log(s->avctx, AV_LOG_ERROR, "too little data for opcode 0xD\n");
506 ✗ return AVERROR_INVALIDDATA;
507 }
508
509 /* 4-color block encoding: each 4x4 block is a different color */
510
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 441 for (y = 0; y < 8; y++) {
511
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 392 if (!(y & 3)) {
512 98 P[0] = bytestream2_get_byte(&s->stream_ptr);
513 98 P[1] = bytestream2_get_byte(&s->stream_ptr);
514 }
515 392 memset(s->pixel_ptr, P[0], 4);
516 392 memset(s->pixel_ptr + 4, P[1], 4);
517 392 s->pixel_ptr += s->stride;
518 }
519
520 /* report success */
521 49 return 0;
522 }
523
524 1696 static int ipvideo_decode_block_opcode_0xE(IpvideoContext *s, AVFrame *frame)
525 {
526 int y;
527 unsigned char pix;
528
529 /* 1-color encoding: the whole block is 1 solid color */
530 1696 pix = bytestream2_get_byte(&s->stream_ptr);
531
532
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 15264 for (y = 0; y < 8; y++) {
533 13568 memset(s->pixel_ptr, pix, 8);
534 13568 s->pixel_ptr += s->stride;
535 }
536
537 /* report success */
538 1696 return 0;
539 }
540
541 27 static int ipvideo_decode_block_opcode_0xF(IpvideoContext *s, AVFrame *frame)
542 {
543 int x, y;
544 unsigned char sample[2];
545
546 /* dithered encoding */
547 27 sample[0] = bytestream2_get_byte(&s->stream_ptr);
548 27 sample[1] = bytestream2_get_byte(&s->stream_ptr);
549
550
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 243 for (y = 0; y < 8; y++) {
551
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 1080 for (x = 0; x < 8; x += 2) {
552 864 *s->pixel_ptr++ = sample[ y & 1 ];
553 864 *s->pixel_ptr++ = sample[!(y & 1)];
554 }
555 216 s->pixel_ptr += s->line_inc;
556 }
557
558 /* report success */
559 27 return 0;
560 }
561
562 ✗ static int ipvideo_decode_block_opcode_0x6_16(IpvideoContext *s, AVFrame *frame)
563 {
564 signed char x, y;
565
566 /* copy a block from the second last frame using an expanded range */
567 ✗ x = bytestream2_get_byte(&s->stream_ptr);
568 ✗ y = bytestream2_get_byte(&s->stream_ptr);
569
570 ff_tlog(s->avctx, "motion bytes = %d, %d\n", x, y);
571 ✗ return copy_from(s, s->second_last_frame, frame, x, y);
572 }
573
574 2197 static int ipvideo_decode_block_opcode_0x7_16(IpvideoContext *s, AVFrame *frame)
575 {
576 int x, y;
577 uint16_t P[2];
578 unsigned int flags;
579 2197 uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
580
581 /* 2-color encoding */
582 2197 P[0] = bytestream2_get_le16(&s->stream_ptr);
583 2197 P[1] = bytestream2_get_le16(&s->stream_ptr);
584
585
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 2197 if (!(P[0] & 0x8000)) {
586
587
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 14823 for (y = 0; y < 8; y++) {
588 13176 flags = bytestream2_get_byte(&s->stream_ptr) | 0x100;
589
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 118584 for (; flags != 1; flags >>= 1)
590 105408 *pixel_ptr++ = P[flags & 1];
591 13176 pixel_ptr += s->line_inc;
592 }
593
594 } else {
595
596 550 flags = bytestream2_get_le16(&s->stream_ptr);
597
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598
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 11000 for (x = 0; x < 8; x += 2, flags >>= 1) {
599 8800 pixel_ptr[x ] =
600 8800 pixel_ptr[x + 1 ] =
601 8800 pixel_ptr[x + s->stride] =
602 8800 pixel_ptr[x + 1 + s->stride] = P[flags & 1];
603 }
604 2200 pixel_ptr += s->stride * 2;
605 }
606 }
607
608 2197 return 0;
609 }
610
611 1478 static int ipvideo_decode_block_opcode_0x8_16(IpvideoContext *s, AVFrame *frame)
612 {
613 int x, y;
614 uint16_t P[4];
615 1478 unsigned int flags = 0;
616 1478 uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
617
618 /* 2-color encoding for each 4x4 quadrant, or 2-color encoding on
619 * either top and bottom or left and right halves */
620 1478 P[0] = bytestream2_get_le16(&s->stream_ptr);
621 1478 P[1] = bytestream2_get_le16(&s->stream_ptr);
622
623
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 1478 if (!(P[0] & 0x8000)) {
624
625
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 4522 for (y = 0; y < 16; y++) {
626 // new values for each 4x4 block
627
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 4256 if (!(y & 3)) {
628
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 1064 if (y) {
629 798 P[0] = bytestream2_get_le16(&s->stream_ptr);
630 798 P[1] = bytestream2_get_le16(&s->stream_ptr);
631 }
632 1064 flags = bytestream2_get_le16(&s->stream_ptr);
633 }
634
635
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 21280 for (x = 0; x < 4; x++, flags >>= 1)
636 17024 *pixel_ptr++ = P[flags & 1];
637 4256 pixel_ptr += s->stride - 4;
638 // switch to right half
639
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 4256 if (y == 7) pixel_ptr -= 8 * s->stride - 4;
640 }
641
642 } else {
643
644 1212 flags = bytestream2_get_le32(&s->stream_ptr);
645 1212 P[2] = bytestream2_get_le16(&s->stream_ptr);
646 1212 P[3] = bytestream2_get_le16(&s->stream_ptr);
647
648
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 1212 if (!(P[2] & 0x8000)) {
649
650 /* vertical split; left & right halves are 2-color encoded */
651
652
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 6834 for (y = 0; y < 16; y++) {
653
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 32160 for (x = 0; x < 4; x++, flags >>= 1)
654 25728 *pixel_ptr++ = P[flags & 1];
655 6432 pixel_ptr += s->stride - 4;
656 // switch to right half
657
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 6432 if (y == 7) {
658 402 pixel_ptr -= 8 * s->stride - 4;
659 402 P[0] = P[2];
660 402 P[1] = P[3];
661 402 flags = bytestream2_get_le32(&s->stream_ptr);
662 }
663 }
664
665 } else {
666
667 /* horizontal split; top & bottom halves are 2-color encoded */
668
669
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 7290 for (y = 0; y < 8; y++) {
670
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 6480 if (y == 4) {
671 810 P[0] = P[2];
672 810 P[1] = P[3];
673 810 flags = bytestream2_get_le32(&s->stream_ptr);
674 }
675
676
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 58320 for (x = 0; x < 8; x++, flags >>= 1)
677 51840 *pixel_ptr++ = P[flags & 1];
678 6480 pixel_ptr += s->line_inc;
679 }
680 }
681 }
682
683 /* report success */
684 1478 return 0;
685 }
686
687 6526 static int ipvideo_decode_block_opcode_0x9_16(IpvideoContext *s, AVFrame *frame)
688 {
689 int x, y;
690 uint16_t P[4];
691 6526 uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
692
693 /* 4-color encoding */
694
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 32630 for (x = 0; x < 4; x++)
695 26104 P[x] = bytestream2_get_le16(&s->stream_ptr);
696
697
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 6526 if (!(P[0] & 0x8000)) {
698
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 2987 if (!(P[2] & 0x8000)) {
699
700 /* 1 of 4 colors for each pixel */
701
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 25947 for (y = 0; y < 8; y++) {
702 /* get the next set of 8 2-bit flags */
703 23064 int flags = bytestream2_get_le16(&s->stream_ptr);
704
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 207576 for (x = 0; x < 8; x++, flags >>= 2)
705 184512 *pixel_ptr++ = P[flags & 0x03];
706 23064 pixel_ptr += s->line_inc;
707 }
708
709 } else {
710 uint32_t flags;
711
712 /* 1 of 4 colors for each 2x2 block */
713 104 flags = bytestream2_get_le32(&s->stream_ptr);
714
715
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 520 for (y = 0; y < 8; y += 2) {
716
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 2080 for (x = 0; x < 8; x += 2, flags >>= 2) {
717 1664 pixel_ptr[x ] =
718 1664 pixel_ptr[x + 1 ] =
719 1664 pixel_ptr[x + s->stride] =
720 1664 pixel_ptr[x + 1 + s->stride] = P[flags & 0x03];
721 }
722 416 pixel_ptr += s->stride * 2;
723 }
724
725 }
726 } else {
727 uint64_t flags;
728
729 /* 1 of 4 colors for each 2x1 or 1x2 block */
730 3539 flags = bytestream2_get_le64(&s->stream_ptr);
731
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 3539 if (!(P[2] & 0x8000)) {
732
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 25371 for (y = 0; y < 8; y++) {
733
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 112760 for (x = 0; x < 8; x += 2, flags >>= 2) {
734 90208 pixel_ptr[x ] =
735 90208 pixel_ptr[x + 1] = P[flags & 0x03];
736 }
737 22552 pixel_ptr += s->stride;
738 }
739 } else {
740
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 3600 for (y = 0; y < 8; y += 2) {
741
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 25920 for (x = 0; x < 8; x++, flags >>= 2) {
742 23040 pixel_ptr[x ] =
743 23040 pixel_ptr[x + s->stride] = P[flags & 0x03];
744 }
745 2880 pixel_ptr += s->stride * 2;
746 }
747 }
748 }
749
750 /* report success */
751 6526 return 0;
752 }
753
754 7914 static int ipvideo_decode_block_opcode_0xA_16(IpvideoContext *s, AVFrame *frame)
755 {
756 int x, y;
757 uint16_t P[8];
758 7914 int flags = 0;
759 7914 uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
760
761
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 39570 for (x = 0; x < 4; x++)
762 31656 P[x] = bytestream2_get_le16(&s->stream_ptr);
763
764 /* 4-color encoding for each 4x4 quadrant, or 4-color encoding on
765 * either top and bottom or left and right halves */
766
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 7914 if (!(P[0] & 0x8000)) {
767
768 /* 4-color encoding for each quadrant */
769
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 52530 for (y = 0; y < 16; y++) {
770 // new values for each 4x4 block
771
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 49440 if (!(y & 3)) {
772
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 12360 if (y)
773
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 46350 for (x = 0; x < 4; x++)
774 37080 P[x] = bytestream2_get_le16(&s->stream_ptr);
775 12360 flags = bytestream2_get_le32(&s->stream_ptr);
776 }
777
778
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 247200 for (x = 0; x < 4; x++, flags >>= 2)
779 197760 *pixel_ptr++ = P[flags & 0x03];
780
781 49440 pixel_ptr += s->stride - 4;
782 // switch to right half
783
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 49440 if (y == 7) pixel_ptr -= 8 * s->stride - 4;
784 }
785
786 } else {
787 // vertical split?
788 int vert;
789 4824 uint64_t flags = bytestream2_get_le64(&s->stream_ptr);
790
791
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 24120 for (x = 4; x < 8; x++)
792 19296 P[x] = bytestream2_get_le16(&s->stream_ptr);
793 4824 vert = !(P[4] & 0x8000);
794
795 /* 4-color encoding for either left and right or top and bottom
796 * halves */
797
798
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 82008 for (y = 0; y < 16; y++) {
799
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 385920 for (x = 0; x < 4; x++, flags >>= 2)
800 308736 *pixel_ptr++ = P[flags & 0x03];
801
802
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 77184 if (vert) {
803 26000 pixel_ptr += s->stride - 4;
804 // switch to right half
805
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 26000 if (y == 7) pixel_ptr -= 8 * s->stride - 4;
806
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 51184 } else if (y & 1) pixel_ptr += s->line_inc;
807
808 // load values for second half
809
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 77184 if (y == 7) {
810 4824 memcpy(P, P + 4, 8);
811 4824 flags = bytestream2_get_le64(&s->stream_ptr);
812 }
813 }
814 }
815
816 /* report success */
817 7914 return 0;
818 }
819
820 1690 static int ipvideo_decode_block_opcode_0xB_16(IpvideoContext *s, AVFrame *frame)
821 {
822 int x, y;
823 1690 uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
824
825 /* 64-color encoding (each pixel in block is a different color) */
826
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 15210 for (y = 0; y < 8; y++) {
827
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 121680 for (x = 0; x < 8; x++)
828 108160 pixel_ptr[x] = bytestream2_get_le16(&s->stream_ptr);
829 13520 pixel_ptr += s->stride;
830 }
831
832 /* report success */
833 1690 return 0;
834 }
835
836 8 static int ipvideo_decode_block_opcode_0xC_16(IpvideoContext *s, AVFrame *frame)
837 {
838 int x, y;
839 8 uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
840
841 /* 16-color block encoding: each 2x2 block is a different color */
842
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 40 for (y = 0; y < 8; y += 2) {
843
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 160 for (x = 0; x < 8; x += 2) {
844 128 pixel_ptr[x ] =
845 128 pixel_ptr[x + 1 ] =
846 128 pixel_ptr[x + s->stride] =
847 128 pixel_ptr[x + 1 + s->stride] = bytestream2_get_le16(&s->stream_ptr);
848 }
849 32 pixel_ptr += s->stride * 2;
850 }
851
852 /* report success */
853 8 return 0;
854 }
855
856 38 static int ipvideo_decode_block_opcode_0xD_16(IpvideoContext *s, AVFrame *frame)
857 {
858 int x, y;
859 uint16_t P[2];
860 38 uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
861
862 /* 4-color block encoding: each 4x4 block is a different color */
863
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 342 for (y = 0; y < 8; y++) {
864
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 304 if (!(y & 3)) {
865 76 P[0] = bytestream2_get_le16(&s->stream_ptr);
866 76 P[1] = bytestream2_get_le16(&s->stream_ptr);
867 }
868
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 2736 for (x = 0; x < 8; x++)
869 2432 pixel_ptr[x] = P[x >> 2];
870 304 pixel_ptr += s->stride;
871 }
872
873 /* report success */
874 38 return 0;
875 }
876
877 3556 static int ipvideo_decode_block_opcode_0xE_16(IpvideoContext *s, AVFrame *frame)
878 {
879 int x, y;
880 uint16_t pix;
881 3556 uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
882
883 /* 1-color encoding: the whole block is 1 solid color */
884 3556 pix = bytestream2_get_le16(&s->stream_ptr);
885
886
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 32004 for (y = 0; y < 8; y++) {
887
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 256032 for (x = 0; x < 8; x++)
888 227584 pixel_ptr[x] = pix;
889 28448 pixel_ptr += s->stride;
890 }
891
892 /* report success */
893 3556 return 0;
894 }
895
896 static int (* const ipvideo_decode_block[])(IpvideoContext *s, AVFrame *frame) = {
897 ipvideo_decode_block_opcode_0x0, ipvideo_decode_block_opcode_0x1,
898 ipvideo_decode_block_opcode_0x2, ipvideo_decode_block_opcode_0x3,
899 ipvideo_decode_block_opcode_0x4, ipvideo_decode_block_opcode_0x5,
900 ipvideo_decode_block_opcode_0x6, ipvideo_decode_block_opcode_0x7,
901 ipvideo_decode_block_opcode_0x8, ipvideo_decode_block_opcode_0x9,
902 ipvideo_decode_block_opcode_0xA, ipvideo_decode_block_opcode_0xB,
903 ipvideo_decode_block_opcode_0xC, ipvideo_decode_block_opcode_0xD,
904 ipvideo_decode_block_opcode_0xE, ipvideo_decode_block_opcode_0xF,
905 };
906
907 static int (* const ipvideo_decode_block16[])(IpvideoContext *s, AVFrame *frame) = {
908 ipvideo_decode_block_opcode_0x0, ipvideo_decode_block_opcode_0x1,
909 ipvideo_decode_block_opcode_0x2, ipvideo_decode_block_opcode_0x3,
910 ipvideo_decode_block_opcode_0x4, ipvideo_decode_block_opcode_0x5,
911 ipvideo_decode_block_opcode_0x6_16, ipvideo_decode_block_opcode_0x7_16,
912 ipvideo_decode_block_opcode_0x8_16, ipvideo_decode_block_opcode_0x9_16,
913 ipvideo_decode_block_opcode_0xA_16, ipvideo_decode_block_opcode_0xB_16,
914 ipvideo_decode_block_opcode_0xC_16, ipvideo_decode_block_opcode_0xD_16,
915 ipvideo_decode_block_opcode_0xE_16, ipvideo_decode_block_opcode_0x1,
916 };
917
918 ✗ static void ipvideo_format_06_firstpass(IpvideoContext *s, AVFrame *frame, int16_t opcode)
919 {
920 int line;
921
922 ✗ if (!opcode) {
923 ✗ for (line = 0; line < 8; ++line) {
924 ✗ bytestream2_get_buffer(&s->stream_ptr, s->pixel_ptr, 8);
925 ✗ s->pixel_ptr += s->stride;
926 }
927 } else {
928 /* Don't try to copy second_last_frame data on the first frames */
929 ✗ if (s->avctx->frame_num > 2)
930 ✗ copy_from(s, s->second_last_frame, frame, 0, 0);
931 }
932 ✗ }
933
934 ✗ static void ipvideo_format_06_secondpass(IpvideoContext *s, AVFrame *frame, int16_t opcode)
935 {
936 int off_x, off_y;
937
938 ✗ if (opcode < 0) {
939 ✗ off_x = ((uint16_t)opcode - 0xC000) % frame->width;
940 ✗ off_y = ((uint16_t)opcode - 0xC000) / frame->width;
941 ✗ copy_from(s, s->last_frame, frame, off_x, off_y);
942 ✗ } else if (opcode > 0) {
943 ✗ off_x = ((uint16_t)opcode - 0x4000) % frame->width;
944 ✗ off_y = ((uint16_t)opcode - 0x4000) / frame->width;
945 ✗ copy_from(s, frame, frame, off_x, off_y);
946 }
947 ✗ }
948
949 static void (* const ipvideo_format_06_passes[])(IpvideoContext *s, AVFrame *frame, int16_t op) = {
950 ipvideo_format_06_firstpass, ipvideo_format_06_secondpass,
951 };
952
953 ✗ static void ipvideo_decode_format_06_opcodes(IpvideoContext *s, AVFrame *frame)
954 {
955 int pass, x, y;
956 int16_t opcode;
957 GetByteContext decoding_map_ptr;
958
959 /* this is PAL8, so make the palette available */
960 ✗ memcpy(frame->data[1], s->pal, AVPALETTE_SIZE);
961 ✗ s->stride = frame->linesize[0];
962
963 ✗ s->line_inc = s->stride - 8;
964 ✗ s->upper_motion_limit_offset = (s->avctx->height - 8) * frame->linesize[0]
965 ✗ + (s->avctx->width - 8) * (1 + s->is_16bpp);
966
967 ✗ bytestream2_init(&decoding_map_ptr, s->decoding_map, s->decoding_map_size);
968
969 ✗ for (pass = 0; pass < 2; ++pass) {
970 ✗ bytestream2_seek(&decoding_map_ptr, 0, SEEK_SET);
971 ✗ for (y = 0; y < s->avctx->height; y += 8) {
972 ✗ for (x = 0; x < s->avctx->width; x += 8) {
973 ✗ opcode = bytestream2_get_le16(&decoding_map_ptr);
974
975 ff_tlog(s->avctx,
976 " block @ (%3d, %3d): opcode 0x%X, data ptr offset %d\n",
977 x, y, opcode, bytestream2_tell(&s->stream_ptr));
978
979 ✗ s->pixel_ptr = frame->data[0] + x + y * frame->linesize[0];
980 ✗ ipvideo_format_06_passes[pass](s, frame, opcode);
981 }
982 }
983 }
984
985 ✗ if (bytestream2_get_bytes_left(&s->stream_ptr) > 1) {
986 ✗ av_log(s->avctx, AV_LOG_DEBUG,
987 "decode finished with %d bytes left over\n",
988 bytestream2_get_bytes_left(&s->stream_ptr));
989 }
990 ✗ }
991
992 ✗ static void ipvideo_format_10_firstpass(IpvideoContext *s, AVFrame *frame, int16_t opcode)
993 {
994 int line;
995
996 ✗ if (!opcode) {
997 ✗ for (line = 0; line < 8; ++line) {
998 ✗ bytestream2_get_buffer(&s->stream_ptr, s->pixel_ptr, 8);
999 ✗ s->pixel_ptr += s->stride;
1000 }
1001 }
1002 ✗ }
1003
1004 ✗ static void ipvideo_format_10_secondpass(IpvideoContext *s, AVFrame *frame, int16_t opcode)
1005 {
1006 int off_x, off_y;
1007
1008 ✗ if (opcode < 0) {
1009 ✗ off_x = ((uint16_t)opcode - 0xC000) % s->cur_decode_frame->width;
1010 ✗ off_y = ((uint16_t)opcode - 0xC000) / s->cur_decode_frame->width;
1011 ✗ copy_from(s, s->prev_decode_frame, s->cur_decode_frame, off_x, off_y);
1012 ✗ } else if (opcode > 0) {
1013 ✗ off_x = ((uint16_t)opcode - 0x4000) % s->cur_decode_frame->width;
1014 ✗ off_y = ((uint16_t)opcode - 0x4000) / s->cur_decode_frame->width;
1015 ✗ copy_from(s, s->cur_decode_frame, s->cur_decode_frame, off_x, off_y);
1016 }
1017 ✗ }
1018
1019 static void (* const ipvideo_format_10_passes[])(IpvideoContext *s, AVFrame *frame, int16_t op) = {
1020 ipvideo_format_10_firstpass, ipvideo_format_10_secondpass,
1021 };
1022
1023 ✗ static void ipvideo_decode_format_10_opcodes(IpvideoContext *s, AVFrame *frame)
1024 {
1025 int pass, x, y, changed_block;
1026 int16_t opcode, skip;
1027 GetByteContext decoding_map_ptr;
1028 GetByteContext skip_map_ptr;
1029
1030 ✗ bytestream2_skip(&s->stream_ptr, 14); /* data starts 14 bytes in */
1031
1032 /* this is PAL8, so make the palette available */
1033 ✗ memcpy(frame->data[1], s->pal, AVPALETTE_SIZE);
1034 ✗ s->stride = frame->linesize[0];
1035
1036 ✗ s->line_inc = s->stride - 8;
1037 ✗ s->upper_motion_limit_offset = (s->avctx->height - 8) * frame->linesize[0]
1038 ✗ + (s->avctx->width - 8) * (1 + s->is_16bpp);
1039
1040 ✗ bytestream2_init(&decoding_map_ptr, s->decoding_map, s->decoding_map_size);
1041 ✗ bytestream2_init(&skip_map_ptr, s->skip_map, s->skip_map_size);
1042
1043 ✗ for (pass = 0; pass < 2; ++pass) {
1044 ✗ bytestream2_seek(&decoding_map_ptr, 0, SEEK_SET);
1045 ✗ bytestream2_seek(&skip_map_ptr, 0, SEEK_SET);
1046 ✗ skip = bytestream2_get_le16(&skip_map_ptr);
1047
1048 ✗ for (y = 0; y < s->avctx->height; y += 8) {
1049 ✗ for (x = 0; x < s->avctx->width; x += 8) {
1050 ✗ s->pixel_ptr = s->cur_decode_frame->data[0] + x + y * s->cur_decode_frame->linesize[0];
1051
1052 ✗ while (skip <= 0) {
1053 ✗ if (skip != -0x8000 && skip) {
1054 ✗ opcode = bytestream2_get_le16(&decoding_map_ptr);
1055 ✗ ipvideo_format_10_passes[pass](s, frame, opcode);
1056 ✗ break;
1057 }
1058 ✗ if (bytestream2_get_bytes_left(&skip_map_ptr) < 2)
1059 ✗ return;
1060 ✗ skip = bytestream2_get_le16(&skip_map_ptr);
1061 }
1062 ✗ skip *= 2;
1063 }
1064 }
1065 }
1066
1067 ✗ bytestream2_seek(&skip_map_ptr, 0, SEEK_SET);
1068 ✗ skip = bytestream2_get_le16(&skip_map_ptr);
1069 ✗ for (y = 0; y < s->avctx->height; y += 8) {
1070 ✗ for (x = 0; x < s->avctx->width; x += 8) {
1071 ✗ changed_block = 0;
1072 ✗ s->pixel_ptr = frame->data[0] + x + y*frame->linesize[0];
1073
1074 ✗ while (skip <= 0) {
1075 ✗ if (skip != -0x8000 && skip) {
1076 ✗ changed_block = 1;
1077 ✗ break;
1078 }
1079 ✗ if (bytestream2_get_bytes_left(&skip_map_ptr) < 2)
1080 ✗ return;
1081 ✗ skip = bytestream2_get_le16(&skip_map_ptr);
1082 }
1083
1084 ✗ if (changed_block) {
1085 ✗ copy_from(s, s->cur_decode_frame, frame, 0, 0);
1086 } else {
1087 /* Don't try to copy last_frame data on the first frame */
1088 ✗ if (s->avctx->frame_num)
1089 ✗ copy_from(s, s->last_frame, frame, 0, 0);
1090 }
1091 ✗ skip *= 2;
1092 }
1093 }
1094
1095 ✗ FFSWAP(AVFrame*, s->prev_decode_frame, s->cur_decode_frame);
1096
1097 ✗ if (bytestream2_get_bytes_left(&s->stream_ptr) > 1) {
1098 ✗ av_log(s->avctx, AV_LOG_DEBUG,
1099 "decode finished with %d bytes left over\n",
1100 bytestream2_get_bytes_left(&s->stream_ptr));
1101 }
1102 }
1103
1104 160 static void ipvideo_decode_format_11_opcodes(IpvideoContext *s, AVFrame *frame)
1105 {
1106 int x, y;
1107 unsigned char opcode;
1108 int ret;
1109 GetBitContext gb;
1110
1111 160 bytestream2_skip(&s->stream_ptr, 14); /* data starts 14 bytes in */
1112
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 160 if (!s->is_16bpp) {
1113 /* this is PAL8, so make the palette available */
1114 110 memcpy(frame->data[1], s->pal, AVPALETTE_SIZE);
1115
1116 110 s->stride = frame->linesize[0];
1117 } else {
1118 50 s->stride = frame->linesize[0] >> 1;
1119 50 s->mv_ptr = s->stream_ptr;
1120 50 bytestream2_skip(&s->mv_ptr, bytestream2_get_le16(&s->stream_ptr));
1121 }
1122 160 s->line_inc = s->stride - 8;
1123 160 s->upper_motion_limit_offset = (s->avctx->height - 8) * frame->linesize[0]
1124 160 + (s->avctx->width - 8) * (1 + s->is_16bpp);
1125
1126 160 init_get_bits(&gb, s->decoding_map, s->decoding_map_size * 8);
1127
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 6560 for (y = 0; y < s->avctx->height; y += 8) {
1128
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1129
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 397600 if (get_bits_left(&gb) < 4)
1130 ✗ return;
1131 397600 opcode = get_bits(&gb, 4);
1132
1133 ff_tlog(s->avctx,
1134 " block @ (%3d, %3d): encoding 0x%X, data ptr offset %d\n",
1135 x, y, opcode, bytestream2_tell(&s->stream_ptr));
1136
1137
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 397600 if (!s->is_16bpp) {
1138 237600 s->pixel_ptr = frame->data[0] + x
1139 237600 + y*frame->linesize[0];
1140 237600 ret = ipvideo_decode_block[opcode](s, frame);
1141 } else {
1142 160000 s->pixel_ptr = frame->data[0] + x*2
1143 160000 + y*frame->linesize[0];
1144 160000 ret = ipvideo_decode_block16[opcode](s, frame);
1145 }
1146
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 397600 if (ret != 0) {
1147 ✗ av_log(s->avctx, AV_LOG_ERROR, "decode problem on frame %"PRId64", @ block (%d, %d)\n",
1148 ✗ s->avctx->frame_num, x, y);
1149 ✗ return;
1150 }
1151 }
1152 }
1153
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 160 if (bytestream2_get_bytes_left(&s->stream_ptr) > 1) {
1154 48 av_log(s->avctx, AV_LOG_DEBUG,
1155 "decode finished with %d bytes left over\n",
1156 bytestream2_get_bytes_left(&s->stream_ptr));
1157 }
1158 }
1159
1160 5 static av_cold int ipvideo_decode_init(AVCodecContext *avctx)
1161 {
1162 5 IpvideoContext *s = avctx->priv_data;
1163
1164 5 s->avctx = avctx;
1165
1166 5 s->is_16bpp = avctx->bits_per_coded_sample == 16;
1167
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 5 avctx->pix_fmt = s->is_16bpp ? AV_PIX_FMT_RGB555 : AV_PIX_FMT_PAL8;
1168
1169 5 ff_hpeldsp_init(&s->hdsp, avctx->flags);
1170
1171 5 s->last_frame = av_frame_alloc();
1172 5 s->second_last_frame = av_frame_alloc();
1173 5 s->cur_decode_frame = av_frame_alloc();
1174 5 s->prev_decode_frame = av_frame_alloc();
1175
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 5 if (!s->last_frame || !s->second_last_frame ||
1176
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 5 !s->cur_decode_frame || !s->prev_decode_frame) {
1177 ✗ return AVERROR(ENOMEM);
1178 }
1179
1180 5 s->cur_decode_frame->width = avctx->width;
1181 5 s->prev_decode_frame->width = avctx->width;
1182 5 s->cur_decode_frame->height = avctx->height;
1183 5 s->prev_decode_frame->height = avctx->height;
1184 5 s->cur_decode_frame->format = avctx->pix_fmt;
1185 5 s->prev_decode_frame->format = avctx->pix_fmt;
1186
1187 5 return 0;
1188 }
1189
1190 160 static int ipvideo_decode_frame(AVCodecContext *avctx, AVFrame *frame,
1191 int *got_frame, AVPacket *avpkt)
1192 {
1193 160 const uint8_t *buf = avpkt->data;
1194 160 int buf_size = avpkt->size;
1195 160 IpvideoContext *s = avctx->priv_data;
1196 int ret;
1197 int send_buffer;
1198 int frame_format;
1199 int video_data_size;
1200
1201
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 160 if (av_packet_get_side_data(avpkt, AV_PKT_DATA_PARAM_CHANGE, NULL)) {
1202 2 av_frame_unref(s->last_frame);
1203 2 av_frame_unref(s->second_last_frame);
1204 2 av_frame_unref(s->cur_decode_frame);
1205 2 av_frame_unref(s->prev_decode_frame);
1206 }
1207
1208
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 160 if (!s->cur_decode_frame->data[0]) {
1209 2 ret = ff_get_buffer(avctx, s->cur_decode_frame, 0);
1210
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 2 if (ret < 0)
1211 ✗ return ret;
1212
1213 2 ret = ff_get_buffer(avctx, s->prev_decode_frame, 0);
1214
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 2 if (ret < 0) {
1215 ✗ av_frame_unref(s->cur_decode_frame);
1216 ✗ return ret;
1217 }
1218 }
1219
1220
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 160 if (buf_size < 8)
1221 ✗ return AVERROR_INVALIDDATA;
1222
1223 160 frame_format = AV_RL8(buf);
1224 160 send_buffer = AV_RL8(buf + 1);
1225 160 video_data_size = AV_RL16(buf + 2);
1226 160 s->decoding_map_size = AV_RL16(buf + 4);
1227 160 s->skip_map_size = AV_RL16(buf + 6);
1228
1229
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 160 switch (frame_format) {
1230 ✗ case 0x06:
1231 ✗ if (s->decoding_map_size) {
1232 ✗ av_log(avctx, AV_LOG_ERROR, "Decoding map for format 0x06\n");
1233 ✗ return AVERROR_INVALIDDATA;
1234 }
1235
1236 ✗ if (s->skip_map_size) {
1237 ✗ av_log(avctx, AV_LOG_ERROR, "Skip map for format 0x06\n");
1238 ✗ return AVERROR_INVALIDDATA;
1239 }
1240
1241 ✗ if (s->is_16bpp) {
1242 ✗ av_log(avctx, AV_LOG_ERROR, "Video format 0x06 does not support 16bpp movies\n");
1243 ✗ return AVERROR_INVALIDDATA;
1244 }
1245
1246 /* Decoding map for 0x06 frame format is at the top of pixeldata */
1247 ✗ s->decoding_map_size = ((s->avctx->width / 8) * (s->avctx->height / 8)) * 2;
1248 ✗ s->decoding_map = buf + 8 + 14; /* 14 bits of op data */
1249 ✗ video_data_size -= s->decoding_map_size + 14;
1250 ✗ if (video_data_size <= 0 || s->decoding_map_size == 0)
1251 ✗ return AVERROR_INVALIDDATA;
1252
1253 ✗ if (buf_size < 8 + s->decoding_map_size + 14 + video_data_size)
1254 ✗ return AVERROR_INVALIDDATA;
1255
1256 ✗ bytestream2_init(&s->stream_ptr, buf + 8 + s->decoding_map_size + 14, video_data_size);
1257
1258 ✗ break;
1259
1260 ✗ case 0x10:
1261 ✗ if (! s->decoding_map_size) {
1262 ✗ av_log(avctx, AV_LOG_ERROR, "Empty decoding map for format 0x10\n");
1263 ✗ return AVERROR_INVALIDDATA;
1264 }
1265
1266 ✗ if (! s->skip_map_size) {
1267 ✗ av_log(avctx, AV_LOG_ERROR, "Empty skip map for format 0x10\n");
1268 ✗ return AVERROR_INVALIDDATA;
1269 }
1270
1271 ✗ if (s->is_16bpp) {
1272 ✗ av_log(avctx, AV_LOG_ERROR, "Video format 0x10 does not support 16bpp movies\n");
1273 ✗ return AVERROR_INVALIDDATA;
1274 }
1275
1276 ✗ if (buf_size < 8 + video_data_size + s->decoding_map_size + s->skip_map_size)
1277 ✗ return AVERROR_INVALIDDATA;
1278
1279 ✗ bytestream2_init(&s->stream_ptr, buf + 8, video_data_size);
1280 ✗ s->decoding_map = buf + 8 + video_data_size;
1281 ✗ s->skip_map = buf + 8 + video_data_size + s->decoding_map_size;
1282
1283 ✗ break;
1284
1285 160 case 0x11:
1286
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 160 if (! s->decoding_map_size) {
1287 ✗ av_log(avctx, AV_LOG_ERROR, "Empty decoding map for format 0x11\n");
1288 ✗ return AVERROR_INVALIDDATA;
1289 }
1290
1291
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 160 if (s->skip_map_size) {
1292 ✗ av_log(avctx, AV_LOG_ERROR, "Skip map for format 0x11\n");
1293 ✗ return AVERROR_INVALIDDATA;
1294 }
1295
1296
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 160 if (buf_size < 8 + video_data_size + s->decoding_map_size)
1297 ✗ return AVERROR_INVALIDDATA;
1298
1299 160 bytestream2_init(&s->stream_ptr, buf + 8, video_data_size);
1300 160 s->decoding_map = buf + 8 + video_data_size;
1301
1302 160 break;
1303
1304 ✗ default:
1305 ✗ av_log(avctx, AV_LOG_ERROR, "Frame type 0x%02X unsupported\n", frame_format);
1306 }
1307
1308 /* ensure we can't overread the packet */
1309
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 160 if (buf_size < 8 + s->decoding_map_size + video_data_size + s->skip_map_size) {
1310 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid IP packet size\n");
1311 ✗ return AVERROR_INVALIDDATA;
1312 }
1313
1314
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 160 if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
1315 ✗ return ret;
1316
1317
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 160 if (!s->is_16bpp) {
1318 110 ff_copy_palette(s->pal, avpkt, avctx);
1319 }
1320
1321
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 160 switch (frame_format) {
1322 ✗ case 0x06:
1323 ✗ ipvideo_decode_format_06_opcodes(s, frame);
1324 ✗ break;
1325 ✗ case 0x10:
1326 ✗ ipvideo_decode_format_10_opcodes(s, frame);
1327 ✗ break;
1328 160 case 0x11:
1329 160 ipvideo_decode_format_11_opcodes(s, frame);
1330 160 break;
1331 }
1332
1333 160 *got_frame = send_buffer;
1334
1335 /* shuffle frames */
1336 160 FFSWAP(AVFrame*, s->second_last_frame, s->last_frame);
1337
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 160 if ((ret = av_frame_replace(s->last_frame, frame)) < 0)
1338 ✗ return ret;
1339
1340 /* report that the buffer was completely consumed */
1341 160 return buf_size;
1342 }
1343
1344 5 static av_cold int ipvideo_decode_end(AVCodecContext *avctx)
1345 {
1346 5 IpvideoContext *s = avctx->priv_data;
1347
1348 5 av_frame_free(&s->last_frame);
1349 5 av_frame_free(&s->second_last_frame);
1350 5 av_frame_free(&s->cur_decode_frame);
1351 5 av_frame_free(&s->prev_decode_frame);
1352
1353 5 return 0;
1354 }
1355
1356 const FFCodec ff_interplay_video_decoder = {
1357 .p.name = "interplayvideo",
1358 CODEC_LONG_NAME("Interplay MVE video"),
1359 .p.type = AVMEDIA_TYPE_VIDEO,
1360 .p.id = AV_CODEC_ID_INTERPLAY_VIDEO,
1361 .priv_data_size = sizeof(IpvideoContext),
1362 .init = ipvideo_decode_init,
1363 .close = ipvideo_decode_end,
1364 FF_CODEC_DECODE_CB(ipvideo_decode_frame),
1365 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_PARAM_CHANGE,
1366 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
1367 };
1368