Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / vmdvideo.c
CommitLineData
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1/*
2 * Sierra VMD video decoder
3 * Copyright (c) 2004 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 * Sierra VMD video decoder
25 * by Vladimir "VAG" Gneushev (vagsoft at mail.ru)
26 * for more information on the Sierra VMD format, visit:
27 * http://www.pcisys.net/~melanson/codecs/
28 *
29 * The video decoder outputs PAL8 colorspace data. The decoder expects
30 * a 0x330-byte VMD file header to be transmitted via extradata during
31 * codec initialization. Each encoded frame that is sent to this decoder
32 * is expected to be prepended with the appropriate 16-byte frame
33 * information record from the VMD file.
34 */
35
36#include <string.h>
37
38#include "libavutil/common.h"
39#include "libavutil/intreadwrite.h"
40
41#include "avcodec.h"
42#include "internal.h"
43#include "bytestream.h"
44
45#define VMD_HEADER_SIZE 0x330
46#define PALETTE_COUNT 256
47
48typedef struct VmdVideoContext {
49
50 AVCodecContext *avctx;
51 AVFrame *prev_frame;
52
53 const unsigned char *buf;
54 int size;
55
56 unsigned char palette[PALETTE_COUNT * 4];
57 unsigned char *unpack_buffer;
58 int unpack_buffer_size;
59
60 int x_off, y_off;
61} VmdVideoContext;
62
63#define QUEUE_SIZE 0x1000
64#define QUEUE_MASK 0x0FFF
65
66static int lz_unpack(const unsigned char *src, int src_len,
67 unsigned char *dest, int dest_len)
68{
69 unsigned char *d;
70 unsigned char *d_end;
71 unsigned char queue[QUEUE_SIZE];
72 unsigned int qpos;
73 unsigned int dataleft;
74 unsigned int chainofs;
75 unsigned int chainlen;
76 unsigned int speclen;
77 unsigned char tag;
78 unsigned int i, j;
79 GetByteContext gb;
80
81 bytestream2_init(&gb, src, src_len);
82 d = dest;
83 d_end = d + dest_len;
84 dataleft = bytestream2_get_le32(&gb);
85 memset(queue, 0x20, QUEUE_SIZE);
86 if (bytestream2_get_bytes_left(&gb) < 4)
87 return AVERROR_INVALIDDATA;
88 if (bytestream2_peek_le32(&gb) == 0x56781234) {
89 bytestream2_skipu(&gb, 4);
90 qpos = 0x111;
91 speclen = 0xF + 3;
92 } else {
93 qpos = 0xFEE;
94 speclen = 100; /* no speclen */
95 }
96
97 while (dataleft > 0 && bytestream2_get_bytes_left(&gb) > 0) {
98 tag = bytestream2_get_byteu(&gb);
99 if ((tag == 0xFF) && (dataleft > 8)) {
100 if (d_end - d < 8 || bytestream2_get_bytes_left(&gb) < 8)
101 return AVERROR_INVALIDDATA;
102 for (i = 0; i < 8; i++) {
103 queue[qpos++] = *d++ = bytestream2_get_byteu(&gb);
104 qpos &= QUEUE_MASK;
105 }
106 dataleft -= 8;
107 } else {
108 for (i = 0; i < 8; i++) {
109 if (dataleft == 0)
110 break;
111 if (tag & 0x01) {
112 if (d_end - d < 1 || bytestream2_get_bytes_left(&gb) < 1)
113 return AVERROR_INVALIDDATA;
114 queue[qpos++] = *d++ = bytestream2_get_byteu(&gb);
115 qpos &= QUEUE_MASK;
116 dataleft--;
117 } else {
118 chainofs = bytestream2_get_byte(&gb);
119 chainofs |= ((bytestream2_peek_byte(&gb) & 0xF0) << 4);
120 chainlen = (bytestream2_get_byte(&gb) & 0x0F) + 3;
121 if (chainlen == speclen) {
122 chainlen = bytestream2_get_byte(&gb) + 0xF + 3;
123 }
124 if (d_end - d < chainlen)
125 return AVERROR_INVALIDDATA;
126 for (j = 0; j < chainlen; j++) {
127 *d = queue[chainofs++ & QUEUE_MASK];
128 queue[qpos++] = *d++;
129 qpos &= QUEUE_MASK;
130 }
131 dataleft -= chainlen;
132 }
133 tag >>= 1;
134 }
135 }
136 }
137 return d - dest;
138}
139static int rle_unpack(const unsigned char *src, unsigned char *dest,
140 int src_count, int src_size, int dest_len)
141{
142 unsigned char *pd;
143 int i, l, used = 0;
144 unsigned char *dest_end = dest + dest_len;
145 GetByteContext gb;
146 uint16_t run_val;
147
148 bytestream2_init(&gb, src, src_size);
149 pd = dest;
150 if (src_count & 1) {
151 if (bytestream2_get_bytes_left(&gb) < 1)
152 return 0;
153 *pd++ = bytestream2_get_byteu(&gb);
154 used++;
155 }
156
157 do {
158 if (bytestream2_get_bytes_left(&gb) < 1)
159 break;
160 l = bytestream2_get_byteu(&gb);
161 if (l & 0x80) {
162 l = (l & 0x7F) * 2;
163 if (dest_end - pd < l || bytestream2_get_bytes_left(&gb) < l)
164 return bytestream2_tell(&gb);
165 bytestream2_get_bufferu(&gb, pd, l);
166 pd += l;
167 } else {
168 if (dest_end - pd < 2*l || bytestream2_get_bytes_left(&gb) < 2)
169 return bytestream2_tell(&gb);
170 run_val = bytestream2_get_ne16(&gb);
171 for (i = 0; i < l; i++) {
172 AV_WN16(pd, run_val);
173 pd += 2;
174 }
175 l *= 2;
176 }
177 used += l;
178 } while (used < src_count);
179
180 return bytestream2_tell(&gb);
181}
182
183static int vmd_decode(VmdVideoContext *s, AVFrame *frame)
184{
185 int i;
186 unsigned int *palette32;
187 unsigned char r, g, b;
188
189 GetByteContext gb;
190
191 unsigned char meth;
192 unsigned char *dp; /* pointer to current frame */
193 unsigned char *pp; /* pointer to previous frame */
194 unsigned char len;
195 int ofs;
196
197 int frame_x, frame_y;
198 int frame_width, frame_height;
199
200 frame_x = AV_RL16(&s->buf[6]);
201 frame_y = AV_RL16(&s->buf[8]);
202 frame_width = AV_RL16(&s->buf[10]) - frame_x + 1;
203 frame_height = AV_RL16(&s->buf[12]) - frame_y + 1;
204
205 if ((frame_width == s->avctx->width && frame_height == s->avctx->height) &&
206 (frame_x || frame_y)) {
207
208 s->x_off = frame_x;
209 s->y_off = frame_y;
210 }
211 frame_x -= s->x_off;
212 frame_y -= s->y_off;
213
214 if (frame_x < 0 || frame_width < 0 ||
215 frame_x >= s->avctx->width ||
216 frame_width > s->avctx->width ||
217 frame_x + frame_width > s->avctx->width) {
218 av_log(s->avctx, AV_LOG_ERROR,
219 "Invalid horizontal range %d-%d\n",
220 frame_x, frame_width);
221 return AVERROR_INVALIDDATA;
222 }
223 if (frame_y < 0 || frame_height < 0 ||
224 frame_y >= s->avctx->height ||
225 frame_height > s->avctx->height ||
226 frame_y + frame_height > s->avctx->height) {
227 av_log(s->avctx, AV_LOG_ERROR,
228 "Invalid vertical range %d-%d\n",
229 frame_x, frame_width);
230 return AVERROR_INVALIDDATA;
231 }
232
233 /* if only a certain region will be updated, copy the entire previous
234 * frame before the decode */
235 if (s->prev_frame->data[0] &&
236 (frame_x || frame_y || (frame_width != s->avctx->width) ||
237 (frame_height != s->avctx->height))) {
238
239 memcpy(frame->data[0], s->prev_frame->data[0],
240 s->avctx->height * frame->linesize[0]);
241 }
242
243 /* check if there is a new palette */
244 bytestream2_init(&gb, s->buf + 16, s->size - 16);
245 if (s->buf[15] & 0x02) {
246 bytestream2_skip(&gb, 2);
247 palette32 = (unsigned int *)s->palette;
248 if (bytestream2_get_bytes_left(&gb) >= PALETTE_COUNT * 3) {
249 for (i = 0; i < PALETTE_COUNT; i++) {
250 r = bytestream2_get_byteu(&gb) * 4;
251 g = bytestream2_get_byteu(&gb) * 4;
252 b = bytestream2_get_byteu(&gb) * 4;
253 palette32[i] = 0xFFU << 24 | (r << 16) | (g << 8) | (b);
254 palette32[i] |= palette32[i] >> 6 & 0x30303;
255 }
256 } else {
257 av_log(s->avctx, AV_LOG_ERROR, "Incomplete palette\n");
258 return AVERROR_INVALIDDATA;
259 }
260 }
261
262 if (!s->size)
263 return 0;
264
265 /* originally UnpackFrame in VAG's code */
266 if (bytestream2_get_bytes_left(&gb) < 1)
267 return AVERROR_INVALIDDATA;
268 meth = bytestream2_get_byteu(&gb);
269 if (meth & 0x80) {
270 int size;
271 if (!s->unpack_buffer_size) {
272 av_log(s->avctx, AV_LOG_ERROR,
273 "Trying to unpack LZ-compressed frame with no LZ buffer\n");
274 return AVERROR_INVALIDDATA;
275 }
276 size = lz_unpack(gb.buffer, bytestream2_get_bytes_left(&gb),
277 s->unpack_buffer, s->unpack_buffer_size);
278 if (size < 0)
279 return size;
280 meth &= 0x7F;
281 bytestream2_init(&gb, s->unpack_buffer, size);
282 }
283
284 dp = &frame->data[0][frame_y * frame->linesize[0] + frame_x];
285 pp = &s->prev_frame->data[0][frame_y * s->prev_frame->linesize[0] + frame_x];
286 switch (meth) {
287 case 1:
288 for (i = 0; i < frame_height; i++) {
289 ofs = 0;
290 do {
291 len = bytestream2_get_byte(&gb);
292 if (len & 0x80) {
293 len = (len & 0x7F) + 1;
294 if (ofs + len > frame_width ||
295 bytestream2_get_bytes_left(&gb) < len)
296 return AVERROR_INVALIDDATA;
297 bytestream2_get_bufferu(&gb, &dp[ofs], len);
298 ofs += len;
299 } else {
300 /* interframe pixel copy */
301 if (ofs + len + 1 > frame_width || !s->prev_frame->data[0])
302 return AVERROR_INVALIDDATA;
303 memcpy(&dp[ofs], &pp[ofs], len + 1);
304 ofs += len + 1;
305 }
306 } while (ofs < frame_width);
307 if (ofs > frame_width) {
308 av_log(s->avctx, AV_LOG_ERROR,
309 "offset > width (%d > %d)\n",
310 ofs, frame_width);
311 return AVERROR_INVALIDDATA;
312 }
313 dp += frame->linesize[0];
314 pp += s->prev_frame->linesize[0];
315 }
316 break;
317
318 case 2:
319 for (i = 0; i < frame_height; i++) {
320 bytestream2_get_buffer(&gb, dp, frame_width);
321 dp += frame->linesize[0];
322 pp += s->prev_frame->linesize[0];
323 }
324 break;
325
326 case 3:
327 for (i = 0; i < frame_height; i++) {
328 ofs = 0;
329 do {
330 len = bytestream2_get_byte(&gb);
331 if (len & 0x80) {
332 len = (len & 0x7F) + 1;
333 if (bytestream2_peek_byte(&gb) == 0xFF) {
334 int slen = len;
335 bytestream2_get_byte(&gb);
336 len = rle_unpack(gb.buffer, &dp[ofs],
337 len, bytestream2_get_bytes_left(&gb),
338 frame_width - ofs);
339 ofs += slen;
340 bytestream2_skip(&gb, len);
341 } else {
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342 if (ofs + len > frame_width ||
343 bytestream2_get_bytes_left(&gb) < len)
344 return AVERROR_INVALIDDATA;
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345 bytestream2_get_buffer(&gb, &dp[ofs], len);
346 ofs += len;
347 }
348 } else {
349 /* interframe pixel copy */
350 if (ofs + len + 1 > frame_width || !s->prev_frame->data[0])
351 return AVERROR_INVALIDDATA;
352 memcpy(&dp[ofs], &pp[ofs], len + 1);
353 ofs += len + 1;
354 }
355 } while (ofs < frame_width);
356 if (ofs > frame_width) {
357 av_log(s->avctx, AV_LOG_ERROR,
358 "offset > width (%d > %d)\n",
359 ofs, frame_width);
360 return AVERROR_INVALIDDATA;
361 }
362 dp += frame->linesize[0];
363 pp += s->prev_frame->linesize[0];
364 }
365 break;
366 }
367 return 0;
368}
369
370static av_cold int vmdvideo_decode_end(AVCodecContext *avctx)
371{
372 VmdVideoContext *s = avctx->priv_data;
373
374 av_frame_free(&s->prev_frame);
375 av_freep(&s->unpack_buffer);
376 s->unpack_buffer_size = 0;
377
378 return 0;
379}
380
381static av_cold int vmdvideo_decode_init(AVCodecContext *avctx)
382{
383 VmdVideoContext *s = avctx->priv_data;
384 int i;
385 unsigned int *palette32;
386 int palette_index = 0;
387 unsigned char r, g, b;
388 unsigned char *vmd_header;
389 unsigned char *raw_palette;
390
391 s->avctx = avctx;
392 avctx->pix_fmt = AV_PIX_FMT_PAL8;
393
394 /* make sure the VMD header made it */
395 if (s->avctx->extradata_size != VMD_HEADER_SIZE) {
396 av_log(s->avctx, AV_LOG_ERROR, "expected extradata size of %d\n",
397 VMD_HEADER_SIZE);
398 return AVERROR_INVALIDDATA;
399 }
400 vmd_header = (unsigned char *)avctx->extradata;
401
402 s->unpack_buffer_size = AV_RL32(&vmd_header[800]);
403 if (s->unpack_buffer_size) {
404 s->unpack_buffer = av_malloc(s->unpack_buffer_size);
405 if (!s->unpack_buffer)
406 return AVERROR(ENOMEM);
407 }
408
409 /* load up the initial palette */
410 raw_palette = &vmd_header[28];
411 palette32 = (unsigned int *)s->palette;
412 for (i = 0; i < PALETTE_COUNT; i++) {
413 r = raw_palette[palette_index++] * 4;
414 g = raw_palette[palette_index++] * 4;
415 b = raw_palette[palette_index++] * 4;
416 palette32[i] = 0xFFU << 24 | (r << 16) | (g << 8) | (b);
417 palette32[i] |= palette32[i] >> 6 & 0x30303;
418 }
419
420 s->prev_frame = av_frame_alloc();
421 if (!s->prev_frame) {
422 vmdvideo_decode_end(avctx);
423 return AVERROR(ENOMEM);
424 }
425
426 return 0;
427}
428
429static int vmdvideo_decode_frame(AVCodecContext *avctx,
430 void *data, int *got_frame,
431 AVPacket *avpkt)
432{
433 const uint8_t *buf = avpkt->data;
434 int buf_size = avpkt->size;
435 VmdVideoContext *s = avctx->priv_data;
436 AVFrame *frame = data;
437 int ret;
438
439 s->buf = buf;
440 s->size = buf_size;
441
442 if (buf_size < 16)
443 return AVERROR_INVALIDDATA;
444
445 if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
446 return ret;
447
448 if ((ret = vmd_decode(s, frame)) < 0)
449 return ret;
450
451 /* make the palette available on the way out */
452 memcpy(frame->data[1], s->palette, PALETTE_COUNT * 4);
453
454 /* shuffle frames */
455 av_frame_unref(s->prev_frame);
456 if ((ret = av_frame_ref(s->prev_frame, frame)) < 0)
457 return ret;
458
459 *got_frame = 1;
460
461 /* report that the buffer was completely consumed */
462 return buf_size;
463}
464
465AVCodec ff_vmdvideo_decoder = {
466 .name = "vmdvideo",
467 .long_name = NULL_IF_CONFIG_SMALL("Sierra VMD video"),
468 .type = AVMEDIA_TYPE_VIDEO,
469 .id = AV_CODEC_ID_VMDVIDEO,
470 .priv_data_size = sizeof(VmdVideoContext),
471 .init = vmdvideo_decode_init,
472 .close = vmdvideo_decode_end,
473 .decode = vmdvideo_decode_frame,
474 .capabilities = CODEC_CAP_DR1,
475};