lavc: use designated initialisers for all codecs.
[libav.git] / libavcodec / xxan.c
1 /*
2 * Wing Commander/Xan Video Decoder
3 * Copyright (C) 2011 Konstantin Shishkov
4 * based on work by Mike Melanson
5 *
6 * This file is part of Libav.
7 *
8 * Libav is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * Libav is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #include "avcodec.h"
24 #include "libavutil/intreadwrite.h"
25 #include "bytestream.h"
26 #define ALT_BITSTREAM_READER_LE
27 #include "get_bits.h"
28 // for av_memcpy_backptr
29 #include "libavutil/lzo.h"
30
31 typedef struct XanContext {
32 AVCodecContext *avctx;
33 AVFrame pic;
34
35 uint8_t *y_buffer;
36 uint8_t *scratch_buffer;
37 int buffer_size;
38 } XanContext;
39
40 static av_cold int xan_decode_init(AVCodecContext *avctx)
41 {
42 XanContext *s = avctx->priv_data;
43
44 s->avctx = avctx;
45
46 avctx->pix_fmt = PIX_FMT_YUV420P;
47
48 s->buffer_size = avctx->width * avctx->height;
49 s->y_buffer = av_malloc(s->buffer_size);
50 if (!s->y_buffer)
51 return AVERROR(ENOMEM);
52 s->scratch_buffer = av_malloc(s->buffer_size + 130);
53 if (!s->scratch_buffer) {
54 av_freep(&s->y_buffer);
55 return AVERROR(ENOMEM);
56 }
57
58 return 0;
59 }
60
61 static int xan_unpack_luma(const uint8_t *src, const int src_size,
62 uint8_t *dst, const int dst_size)
63 {
64 int tree_size, eof;
65 const uint8_t *tree;
66 int bits, mask;
67 int tree_root, node;
68 const uint8_t *dst_end = dst + dst_size;
69 const uint8_t *src_end = src + src_size;
70
71 tree_size = *src++;
72 eof = *src++;
73 tree = src - eof * 2 - 2;
74 tree_root = eof + tree_size;
75 src += tree_size * 2;
76
77 node = tree_root;
78 bits = *src++;
79 mask = 0x80;
80 for (;;) {
81 int bit = !!(bits & mask);
82 mask >>= 1;
83 node = tree[node*2 + bit];
84 if (node == eof)
85 break;
86 if (node < eof) {
87 *dst++ = node;
88 if (dst > dst_end)
89 break;
90 node = tree_root;
91 }
92 if (!mask) {
93 bits = *src++;
94 if (src > src_end)
95 break;
96 mask = 0x80;
97 }
98 }
99 return dst != dst_end;
100 }
101
102 /* almost the same as in xan_wc3 decoder */
103 static int xan_unpack(uint8_t *dest, const int dest_len,
104 const uint8_t *src, const int src_len)
105 {
106 uint8_t opcode;
107 int size;
108 uint8_t *orig_dest = dest;
109 const uint8_t *src_end = src + src_len;
110 const uint8_t *dest_end = dest + dest_len;
111
112 while (dest < dest_end) {
113 opcode = *src++;
114
115 if (opcode < 0xe0) {
116 int size2, back;
117 if ((opcode & 0x80) == 0) {
118 size = opcode & 3;
119 back = ((opcode & 0x60) << 3) + *src++ + 1;
120 size2 = ((opcode & 0x1c) >> 2) + 3;
121 } else if ((opcode & 0x40) == 0) {
122 size = *src >> 6;
123 back = (bytestream_get_be16(&src) & 0x3fff) + 1;
124 size2 = (opcode & 0x3f) + 4;
125 } else {
126 size = opcode & 3;
127 back = ((opcode & 0x10) << 12) + bytestream_get_be16(&src) + 1;
128 size2 = ((opcode & 0x0c) << 6) + *src++ + 5;
129 if (size + size2 > dest_end - dest)
130 break;
131 }
132 if (src + size > src_end || dest + size + size2 > dest_end)
133 return -1;
134 bytestream_get_buffer(&src, dest, size);
135 dest += size;
136 av_memcpy_backptr(dest, back, size2);
137 dest += size2;
138 } else {
139 int finish = opcode >= 0xfc;
140
141 size = finish ? opcode & 3 : ((opcode & 0x1f) << 2) + 4;
142 if (src + size > src_end || dest + size > dest_end)
143 return -1;
144 bytestream_get_buffer(&src, dest, size);
145 dest += size;
146 if (finish)
147 break;
148 }
149 }
150 return dest - orig_dest;
151 }
152
153 static int xan_decode_chroma(AVCodecContext *avctx, AVPacket *avpkt)
154 {
155 const uint8_t *buf = avpkt->data;
156 XanContext *s = avctx->priv_data;
157 uint8_t *U, *V;
158 unsigned chroma_off;
159 int val, uval, vval;
160 int i, j;
161 const uint8_t *src, *src_end;
162 const uint8_t *table;
163 int mode, offset, dec_size;
164
165 chroma_off = AV_RL32(buf + 4);
166 if (!chroma_off)
167 return 0;
168 if (chroma_off + 10 >= avpkt->size) {
169 av_log(avctx, AV_LOG_ERROR, "Invalid chroma block position\n");
170 return -1;
171 }
172 src = avpkt->data + 4 + chroma_off;
173 table = src + 2;
174 mode = bytestream_get_le16(&src);
175 offset = bytestream_get_le16(&src) * 2;
176
177 if (src - avpkt->data >= avpkt->size - offset) {
178 av_log(avctx, AV_LOG_ERROR, "Invalid chroma block offset\n");
179 return -1;
180 }
181
182 memset(s->scratch_buffer, 0, s->buffer_size);
183 dec_size = xan_unpack(s->scratch_buffer, s->buffer_size, src + offset,
184 avpkt->size - offset - (src - avpkt->data));
185 if (dec_size < 0) {
186 av_log(avctx, AV_LOG_ERROR, "Chroma unpacking failed\n");
187 return -1;
188 }
189
190 U = s->pic.data[1];
191 V = s->pic.data[2];
192 src = s->scratch_buffer;
193 src_end = src + dec_size;
194 if (mode) {
195 for (j = 0; j < avctx->height >> 1; j++) {
196 for (i = 0; i < avctx->width >> 1; i++) {
197 val = *src++;
198 if (val) {
199 val = AV_RL16(table + (val << 1));
200 uval = (val >> 3) & 0xF8;
201 vval = (val >> 8) & 0xF8;
202 U[i] = uval | (uval >> 5);
203 V[i] = vval | (vval >> 5);
204 }
205 if (src == src_end)
206 return 0;
207 }
208 U += s->pic.linesize[1];
209 V += s->pic.linesize[2];
210 }
211 } else {
212 uint8_t *U2 = U + s->pic.linesize[1];
213 uint8_t *V2 = V + s->pic.linesize[2];
214
215 for (j = 0; j < avctx->height >> 2; j++) {
216 for (i = 0; i < avctx->width >> 1; i += 2) {
217 val = *src++;
218 if (val) {
219 val = AV_RL16(table + (val << 1));
220 uval = (val >> 3) & 0xF8;
221 vval = (val >> 8) & 0xF8;
222 U[i] = U[i+1] = U2[i] = U2[i+1] = uval | (uval >> 5);
223 V[i] = V[i+1] = V2[i] = V2[i+1] = vval | (vval >> 5);
224 }
225 }
226 U += s->pic.linesize[1] * 2;
227 V += s->pic.linesize[2] * 2;
228 U2 += s->pic.linesize[1] * 2;
229 V2 += s->pic.linesize[2] * 2;
230 }
231 }
232
233 return 0;
234 }
235
236 static int xan_decode_frame_type0(AVCodecContext *avctx, AVPacket *avpkt)
237 {
238 const uint8_t *buf = avpkt->data;
239 XanContext *s = avctx->priv_data;
240 uint8_t *ybuf, *prev_buf, *src = s->scratch_buffer;
241 unsigned chroma_off, corr_off;
242 int cur, last, size;
243 int i, j;
244 int ret;
245
246 corr_off = AV_RL32(buf + 8);
247 chroma_off = AV_RL32(buf + 4);
248
249 if ((ret = xan_decode_chroma(avctx, avpkt)) != 0)
250 return ret;
251
252 size = avpkt->size - 4;
253 if (corr_off >= avpkt->size) {
254 av_log(avctx, AV_LOG_WARNING, "Ignoring invalid correction block position\n");
255 corr_off = 0;
256 }
257 if (corr_off)
258 size = corr_off;
259 if (chroma_off)
260 size = FFMIN(size, chroma_off);
261 ret = xan_unpack_luma(buf + 12, size, src, s->buffer_size >> 1);
262 if (ret) {
263 av_log(avctx, AV_LOG_ERROR, "Luma decoding failed\n");
264 return ret;
265 }
266
267 ybuf = s->y_buffer;
268 last = *src++;
269 ybuf[0] = last << 1;
270 for (j = 1; j < avctx->width - 1; j += 2) {
271 cur = (last + *src++) & 0x1F;
272 ybuf[j] = last + cur;
273 ybuf[j+1] = cur << 1;
274 last = cur;
275 }
276 ybuf[j] = last << 1;
277 prev_buf = ybuf;
278 ybuf += avctx->width;
279
280 for (i = 1; i < avctx->height; i++) {
281 last = ((prev_buf[0] >> 1) + *src++) & 0x1F;
282 ybuf[0] = last << 1;
283 for (j = 1; j < avctx->width - 1; j += 2) {
284 cur = ((prev_buf[j + 1] >> 1) + *src++) & 0x1F;
285 ybuf[j] = last + cur;
286 ybuf[j+1] = cur << 1;
287 last = cur;
288 }
289 ybuf[j] = last << 1;
290 prev_buf = ybuf;
291 ybuf += avctx->width;
292 }
293
294 if (corr_off) {
295 int corr_end, dec_size;
296
297 corr_end = avpkt->size;
298 if (chroma_off > corr_off)
299 corr_end = chroma_off;
300 dec_size = xan_unpack(s->scratch_buffer, s->buffer_size,
301 avpkt->data + 8 + corr_off,
302 corr_end - corr_off);
303 if (dec_size < 0)
304 dec_size = 0;
305 for (i = 0; i < dec_size; i++)
306 s->y_buffer[i*2+1] = (s->y_buffer[i*2+1] + (s->scratch_buffer[i] << 1)) & 0x3F;
307 }
308
309 src = s->y_buffer;
310 ybuf = s->pic.data[0];
311 for (j = 0; j < avctx->height; j++) {
312 for (i = 0; i < avctx->width; i++)
313 ybuf[i] = (src[i] << 2) | (src[i] >> 3);
314 src += avctx->width;
315 ybuf += s->pic.linesize[0];
316 }
317
318 return 0;
319 }
320
321 static int xan_decode_frame_type1(AVCodecContext *avctx, AVPacket *avpkt)
322 {
323 const uint8_t *buf = avpkt->data;
324 XanContext *s = avctx->priv_data;
325 uint8_t *ybuf, *src = s->scratch_buffer;
326 int cur, last;
327 int i, j;
328 int ret;
329
330 if ((ret = xan_decode_chroma(avctx, avpkt)) != 0)
331 return ret;
332
333 ret = xan_unpack_luma(buf + 16, avpkt->size - 16, src,
334 s->buffer_size >> 1);
335 if (ret) {
336 av_log(avctx, AV_LOG_ERROR, "Luma decoding failed\n");
337 return ret;
338 }
339
340 ybuf = s->y_buffer;
341 for (i = 0; i < avctx->height; i++) {
342 last = (ybuf[0] + (*src++ << 1)) & 0x3F;
343 ybuf[0] = last;
344 for (j = 1; j < avctx->width - 1; j += 2) {
345 cur = (ybuf[j + 1] + (*src++ << 1)) & 0x3F;
346 ybuf[j] = (last + cur) >> 1;
347 ybuf[j+1] = cur;
348 last = cur;
349 }
350 ybuf[j] = last;
351 ybuf += avctx->width;
352 }
353
354 src = s->y_buffer;
355 ybuf = s->pic.data[0];
356 for (j = 0; j < avctx->height; j++) {
357 for (i = 0; i < avctx->width; i++)
358 ybuf[i] = (src[i] << 2) | (src[i] >> 3);
359 src += avctx->width;
360 ybuf += s->pic.linesize[0];
361 }
362
363 return 0;
364 }
365
366 static int xan_decode_frame(AVCodecContext *avctx,
367 void *data, int *data_size,
368 AVPacket *avpkt)
369 {
370 XanContext *s = avctx->priv_data;
371 int ftype;
372 int ret;
373
374 s->pic.reference = 1;
375 s->pic.buffer_hints = FF_BUFFER_HINTS_VALID |
376 FF_BUFFER_HINTS_PRESERVE |
377 FF_BUFFER_HINTS_REUSABLE;
378 if ((ret = avctx->reget_buffer(avctx, &s->pic))) {
379 av_log(s->avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
380 return ret;
381 }
382
383 ftype = AV_RL32(avpkt->data);
384 switch (ftype) {
385 case 0:
386 ret = xan_decode_frame_type0(avctx, avpkt);
387 break;
388 case 1:
389 ret = xan_decode_frame_type1(avctx, avpkt);
390 break;
391 default:
392 av_log(avctx, AV_LOG_ERROR, "Unknown frame type %d\n", ftype);
393 return -1;
394 }
395 if (ret)
396 return ret;
397
398 *data_size = sizeof(AVFrame);
399 *(AVFrame*)data = s->pic;
400
401 return avpkt->size;
402 }
403
404 static av_cold int xan_decode_end(AVCodecContext *avctx)
405 {
406 XanContext *s = avctx->priv_data;
407
408 if (s->pic.data[0])
409 avctx->release_buffer(avctx, &s->pic);
410
411 av_freep(&s->y_buffer);
412 av_freep(&s->scratch_buffer);
413
414 return 0;
415 }
416
417 AVCodec ff_xan_wc4_decoder = {
418 .name = "xan_wc4",
419 .type = AVMEDIA_TYPE_VIDEO,
420 .id = CODEC_ID_XAN_WC4,
421 .priv_data_size = sizeof(XanContext),
422 .init = xan_decode_init,
423 .close = xan_decode_end,
424 .decode = xan_decode_frame,
425 .capabilities = CODEC_CAP_DR1,
426 .long_name = NULL_IF_CONFIG_SMALL("Wing Commander IV / Xxan"),
427 };
428