Add ff_ prefix to data symbols of encoders, decoders, hwaccel, parsers, bsf.
[libav.git] / libavcodec / dxa.c
1 /*
2 * Feeble Files/ScummVM DXA decoder
3 * Copyright (c) 2007 Konstantin Shishkov
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 * DXA Video decoder
25 */
26
27 #include <stdio.h>
28 #include <stdlib.h>
29
30 #include "libavutil/intreadwrite.h"
31 #include "avcodec.h"
32
33 #include <zlib.h>
34
35 /*
36 * Decoder context
37 */
38 typedef struct DxaDecContext {
39 AVCodecContext *avctx;
40 AVFrame pic, prev;
41
42 int dsize;
43 uint8_t *decomp_buf;
44 uint32_t pal[256];
45 } DxaDecContext;
46
47 static const int shift1[6] = { 0, 8, 8, 8, 4, 4 };
48 static const int shift2[6] = { 0, 0, 8, 4, 0, 4 };
49
50 static int decode_13(AVCodecContext *avctx, DxaDecContext *c, uint8_t* dst, uint8_t *src, uint8_t *ref)
51 {
52 uint8_t *code, *data, *mv, *msk, *tmp, *tmp2;
53 int i, j, k;
54 int type, x, y, d, d2;
55 int stride = c->pic.linesize[0];
56 uint32_t mask;
57
58 code = src + 12;
59 data = code + ((avctx->width * avctx->height) >> 4);
60 mv = data + AV_RB32(src + 0);
61 msk = mv + AV_RB32(src + 4);
62
63 for(j = 0; j < avctx->height; j += 4){
64 for(i = 0; i < avctx->width; i += 4){
65 tmp = dst + i;
66 tmp2 = ref + i;
67 type = *code++;
68 switch(type){
69 case 4: // motion compensation
70 x = (*mv) >> 4; if(x & 8) x = 8 - x;
71 y = (*mv++) & 0xF; if(y & 8) y = 8 - y;
72 tmp2 += x + y*stride;
73 case 0: // skip
74 case 5: // skip in method 12
75 for(y = 0; y < 4; y++){
76 memcpy(tmp, tmp2, 4);
77 tmp += stride;
78 tmp2 += stride;
79 }
80 break;
81 case 1: // masked change
82 case 10: // masked change with only half of pixels changed
83 case 11: // cases 10-15 are for method 12 only
84 case 12:
85 case 13:
86 case 14:
87 case 15:
88 if(type == 1){
89 mask = AV_RB16(msk);
90 msk += 2;
91 }else{
92 type -= 10;
93 mask = ((msk[0] & 0xF0) << shift1[type]) | ((msk[0] & 0xF) << shift2[type]);
94 msk++;
95 }
96 for(y = 0; y < 4; y++){
97 for(x = 0; x < 4; x++){
98 tmp[x] = (mask & 0x8000) ? *data++ : tmp2[x];
99 mask <<= 1;
100 }
101 tmp += stride;
102 tmp2 += stride;
103 }
104 break;
105 case 2: // fill block
106 for(y = 0; y < 4; y++){
107 memset(tmp, data[0], 4);
108 tmp += stride;
109 }
110 data++;
111 break;
112 case 3: // raw block
113 for(y = 0; y < 4; y++){
114 memcpy(tmp, data, 4);
115 data += 4;
116 tmp += stride;
117 }
118 break;
119 case 8: // subblocks - method 13 only
120 mask = *msk++;
121 for(k = 0; k < 4; k++){
122 d = ((k & 1) << 1) + ((k & 2) * stride);
123 d2 = ((k & 1) << 1) + ((k & 2) * stride);
124 tmp2 = ref + i + d2;
125 switch(mask & 0xC0){
126 case 0x80: // motion compensation
127 x = (*mv) >> 4; if(x & 8) x = 8 - x;
128 y = (*mv++) & 0xF; if(y & 8) y = 8 - y;
129 tmp2 += x + y*stride;
130 case 0x00: // skip
131 tmp[d + 0 ] = tmp2[0];
132 tmp[d + 1 ] = tmp2[1];
133 tmp[d + 0 + stride] = tmp2[0 + stride];
134 tmp[d + 1 + stride] = tmp2[1 + stride];
135 break;
136 case 0x40: // fill
137 tmp[d + 0 ] = data[0];
138 tmp[d + 1 ] = data[0];
139 tmp[d + 0 + stride] = data[0];
140 tmp[d + 1 + stride] = data[0];
141 data++;
142 break;
143 case 0xC0: // raw
144 tmp[d + 0 ] = *data++;
145 tmp[d + 1 ] = *data++;
146 tmp[d + 0 + stride] = *data++;
147 tmp[d + 1 + stride] = *data++;
148 break;
149 }
150 mask <<= 2;
151 }
152 break;
153 case 32: // vector quantization - 2 colors
154 mask = AV_RB16(msk);
155 msk += 2;
156 for(y = 0; y < 4; y++){
157 for(x = 0; x < 4; x++){
158 tmp[x] = data[mask & 1];
159 mask >>= 1;
160 }
161 tmp += stride;
162 tmp2 += stride;
163 }
164 data += 2;
165 break;
166 case 33: // vector quantization - 3 or 4 colors
167 case 34:
168 mask = AV_RB32(msk);
169 msk += 4;
170 for(y = 0; y < 4; y++){
171 for(x = 0; x < 4; x++){
172 tmp[x] = data[mask & 3];
173 mask >>= 2;
174 }
175 tmp += stride;
176 tmp2 += stride;
177 }
178 data += type - 30;
179 break;
180 default:
181 av_log(avctx, AV_LOG_ERROR, "Unknown opcode %d\n", type);
182 return -1;
183 }
184 }
185 dst += stride * 4;
186 ref += stride * 4;
187 }
188 return 0;
189 }
190
191 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
192 {
193 const uint8_t *buf = avpkt->data;
194 int buf_size = avpkt->size;
195 DxaDecContext * const c = avctx->priv_data;
196 uint8_t *outptr, *srcptr, *tmpptr;
197 unsigned long dsize;
198 int i, j, compr;
199 int stride;
200 int orig_buf_size = buf_size;
201 int pc = 0;
202
203 /* make the palette available on the way out */
204 if(buf[0]=='C' && buf[1]=='M' && buf[2]=='A' && buf[3]=='P'){
205 int r, g, b;
206
207 buf += 4;
208 for(i = 0; i < 256; i++){
209 r = *buf++;
210 g = *buf++;
211 b = *buf++;
212 c->pal[i] = (r << 16) | (g << 8) | b;
213 }
214 pc = 1;
215 buf_size -= 768+4;
216 }
217
218 if(avctx->get_buffer(avctx, &c->pic) < 0){
219 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
220 return -1;
221 }
222 memcpy(c->pic.data[1], c->pal, AVPALETTE_SIZE);
223 c->pic.palette_has_changed = pc;
224
225 outptr = c->pic.data[0];
226 srcptr = c->decomp_buf;
227 tmpptr = c->prev.data[0];
228 stride = c->pic.linesize[0];
229
230 if(buf[0]=='N' && buf[1]=='U' && buf[2]=='L' && buf[3]=='L')
231 compr = -1;
232 else
233 compr = buf[4];
234
235 dsize = c->dsize;
236 if((compr != 4 && compr != -1) && uncompress(c->decomp_buf, &dsize, buf + 9, buf_size - 9) != Z_OK){
237 av_log(avctx, AV_LOG_ERROR, "Uncompress failed!\n");
238 return -1;
239 }
240 switch(compr){
241 case -1:
242 c->pic.key_frame = 0;
243 c->pic.pict_type = FF_P_TYPE;
244 if(c->prev.data[0])
245 memcpy(c->pic.data[0], c->prev.data[0], c->pic.linesize[0] * avctx->height);
246 else{ // Should happen only when first frame is 'NULL'
247 memset(c->pic.data[0], 0, c->pic.linesize[0] * avctx->height);
248 c->pic.key_frame = 1;
249 c->pic.pict_type = FF_I_TYPE;
250 }
251 break;
252 case 2:
253 case 3:
254 case 4:
255 case 5:
256 c->pic.key_frame = !(compr & 1);
257 c->pic.pict_type = (compr & 1) ? FF_P_TYPE : FF_I_TYPE;
258 for(j = 0; j < avctx->height; j++){
259 if(compr & 1){
260 for(i = 0; i < avctx->width; i++)
261 outptr[i] = srcptr[i] ^ tmpptr[i];
262 tmpptr += stride;
263 }else
264 memcpy(outptr, srcptr, avctx->width);
265 outptr += stride;
266 srcptr += avctx->width;
267 }
268 break;
269 case 12: // ScummVM coding
270 case 13:
271 c->pic.key_frame = 0;
272 c->pic.pict_type = FF_P_TYPE;
273 decode_13(avctx, c, c->pic.data[0], srcptr, c->prev.data[0]);
274 break;
275 default:
276 av_log(avctx, AV_LOG_ERROR, "Unknown/unsupported compression type %d\n", buf[4]);
277 return -1;
278 }
279
280 FFSWAP(AVFrame, c->pic, c->prev);
281 if(c->pic.data[0])
282 avctx->release_buffer(avctx, &c->pic);
283
284 *data_size = sizeof(AVFrame);
285 *(AVFrame*)data = c->prev;
286
287 /* always report that the buffer was completely consumed */
288 return orig_buf_size;
289 }
290
291 static av_cold int decode_init(AVCodecContext *avctx)
292 {
293 DxaDecContext * const c = avctx->priv_data;
294
295 c->avctx = avctx;
296 avctx->pix_fmt = PIX_FMT_PAL8;
297
298 c->dsize = avctx->width * avctx->height * 2;
299 if((c->decomp_buf = av_malloc(c->dsize)) == NULL) {
300 av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
301 return -1;
302 }
303
304 return 0;
305 }
306
307 static av_cold int decode_end(AVCodecContext *avctx)
308 {
309 DxaDecContext * const c = avctx->priv_data;
310
311 av_freep(&c->decomp_buf);
312 if(c->prev.data[0])
313 avctx->release_buffer(avctx, &c->prev);
314 if(c->pic.data[0])
315 avctx->release_buffer(avctx, &c->pic);
316
317 return 0;
318 }
319
320 AVCodec ff_dxa_decoder = {
321 "dxa",
322 AVMEDIA_TYPE_VIDEO,
323 CODEC_ID_DXA,
324 sizeof(DxaDecContext),
325 decode_init,
326 NULL,
327 decode_end,
328 decode_frame,
329 CODEC_CAP_DR1,
330 .long_name = NULL_IF_CONFIG_SMALL("Feeble Files/ScummVM DXA"),
331 };
332