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00028 #include <stdio.h>
00029 #include <stdlib.h>
00030
00031 #include "libavutil/intreadwrite.h"
00032 #include "avcodec.h"
00033
00034 enum EncTypes {
00035 MAGIC_WMVd = 0x574D5664,
00036 MAGIC_WMVe,
00037 MAGIC_WMVf,
00038 MAGIC_WMVg,
00039 MAGIC_WMVh,
00040 MAGIC_WMVi,
00041 MAGIC_WMVj
00042 };
00043
00044 enum HexTile_Flags {
00045 HT_RAW = 1,
00046 HT_BKG = 2,
00047 HT_FG = 4,
00048 HT_SUB = 8,
00049 HT_CLR = 16
00050 };
00051
00052
00053
00054
00055 typedef struct VmncContext {
00056 AVCodecContext *avctx;
00057 AVFrame pic;
00058
00059 int bpp;
00060 int bpp2;
00061 int bigendian;
00062 uint8_t pal[768];
00063 int width, height;
00064
00065
00066 int cur_w, cur_h;
00067 int cur_x, cur_y;
00068 int cur_hx, cur_hy;
00069 uint8_t* curbits, *curmask;
00070 uint8_t* screendta;
00071 } VmncContext;
00072
00073
00074 static av_always_inline int vmnc_get_pixel(const uint8_t* buf, int bpp, int be) {
00075 switch(bpp * 2 + be) {
00076 case 2:
00077 case 3: return *buf;
00078 case 4: return AV_RL16(buf);
00079 case 5: return AV_RB16(buf);
00080 case 8: return AV_RL32(buf);
00081 case 9: return AV_RB32(buf);
00082 default: return 0;
00083 }
00084 }
00085
00086 static void load_cursor(VmncContext *c, const uint8_t *src)
00087 {
00088 int i, j, p;
00089 const int bpp = c->bpp2;
00090 uint8_t *dst8 = c->curbits;
00091 uint16_t *dst16 = (uint16_t*)c->curbits;
00092 uint32_t *dst32 = (uint32_t*)c->curbits;
00093
00094 for(j = 0; j < c->cur_h; j++) {
00095 for(i = 0; i < c->cur_w; i++) {
00096 p = vmnc_get_pixel(src, bpp, c->bigendian);
00097 src += bpp;
00098 if(bpp == 1) *dst8++ = p;
00099 if(bpp == 2) *dst16++ = p;
00100 if(bpp == 4) *dst32++ = p;
00101 }
00102 }
00103 dst8 = c->curmask;
00104 dst16 = (uint16_t*)c->curmask;
00105 dst32 = (uint32_t*)c->curmask;
00106 for(j = 0; j < c->cur_h; j++) {
00107 for(i = 0; i < c->cur_w; i++) {
00108 p = vmnc_get_pixel(src, bpp, c->bigendian);
00109 src += bpp;
00110 if(bpp == 1) *dst8++ = p;
00111 if(bpp == 2) *dst16++ = p;
00112 if(bpp == 4) *dst32++ = p;
00113 }
00114 }
00115 }
00116
00117 static void put_cursor(uint8_t *dst, int stride, VmncContext *c, int dx, int dy)
00118 {
00119 int i, j;
00120 int w, h, x, y;
00121 w = c->cur_w;
00122 if(c->width < c->cur_x + c->cur_w) w = c->width - c->cur_x;
00123 h = c->cur_h;
00124 if(c->height < c->cur_y + c->cur_h) h = c->height - c->cur_y;
00125 x = c->cur_x;
00126 y = c->cur_y;
00127 if(x < 0) {
00128 w += x;
00129 x = 0;
00130 }
00131 if(y < 0) {
00132 h += y;
00133 y = 0;
00134 }
00135
00136 if((w < 1) || (h < 1)) return;
00137 dst += x * c->bpp2 + y * stride;
00138
00139 if(c->bpp2 == 1) {
00140 uint8_t* cd = c->curbits, *msk = c->curmask;
00141 for(j = 0; j < h; j++) {
00142 for(i = 0; i < w; i++)
00143 dst[i] = (dst[i] & cd[i]) ^ msk[i];
00144 msk += c->cur_w;
00145 cd += c->cur_w;
00146 dst += stride;
00147 }
00148 } else if(c->bpp2 == 2) {
00149 uint16_t* cd = (uint16_t*)c->curbits, *msk = (uint16_t*)c->curmask;
00150 uint16_t* dst2;
00151 for(j = 0; j < h; j++) {
00152 dst2 = (uint16_t*)dst;
00153 for(i = 0; i < w; i++)
00154 dst2[i] = (dst2[i] & cd[i]) ^ msk[i];
00155 msk += c->cur_w;
00156 cd += c->cur_w;
00157 dst += stride;
00158 }
00159 } else if(c->bpp2 == 4) {
00160 uint32_t* cd = (uint32_t*)c->curbits, *msk = (uint32_t*)c->curmask;
00161 uint32_t* dst2;
00162 for(j = 0; j < h; j++) {
00163 dst2 = (uint32_t*)dst;
00164 for(i = 0; i < w; i++)
00165 dst2[i] = (dst2[i] & cd[i]) ^ msk[i];
00166 msk += c->cur_w;
00167 cd += c->cur_w;
00168 dst += stride;
00169 }
00170 }
00171 }
00172
00173
00174 static av_always_inline void paint_rect(uint8_t *dst, int dx, int dy, int w, int h, int color, int bpp, int stride)
00175 {
00176 int i, j;
00177 dst += dx * bpp + dy * stride;
00178 if(bpp == 1){
00179 for(j = 0; j < h; j++) {
00180 memset(dst, color, w);
00181 dst += stride;
00182 }
00183 }else if(bpp == 2){
00184 uint16_t* dst2;
00185 for(j = 0; j < h; j++) {
00186 dst2 = (uint16_t*)dst;
00187 for(i = 0; i < w; i++) {
00188 *dst2++ = color;
00189 }
00190 dst += stride;
00191 }
00192 }else if(bpp == 4){
00193 uint32_t* dst2;
00194 for(j = 0; j < h; j++) {
00195 dst2 = (uint32_t*)dst;
00196 for(i = 0; i < w; i++) {
00197 dst2[i] = color;
00198 }
00199 dst += stride;
00200 }
00201 }
00202 }
00203
00204 static av_always_inline void paint_raw(uint8_t *dst, int w, int h, const uint8_t* src, int bpp, int be, int stride)
00205 {
00206 int i, j, p;
00207 for(j = 0; j < h; j++) {
00208 for(i = 0; i < w; i++) {
00209 p = vmnc_get_pixel(src, bpp, be);
00210 src += bpp;
00211 switch(bpp){
00212 case 1:
00213 dst[i] = p;
00214 break;
00215 case 2:
00216 ((uint16_t*)dst)[i] = p;
00217 break;
00218 case 4:
00219 ((uint32_t*)dst)[i] = p;
00220 break;
00221 }
00222 }
00223 dst += stride;
00224 }
00225 }
00226
00227 static int decode_hextile(VmncContext *c, uint8_t* dst, const uint8_t* src, int ssize, int w, int h, int stride)
00228 {
00229 int i, j, k;
00230 int bg = 0, fg = 0, rects, color, flags, xy, wh;
00231 const int bpp = c->bpp2;
00232 uint8_t *dst2;
00233 int bw = 16, bh = 16;
00234 const uint8_t *ssrc=src;
00235
00236 for(j = 0; j < h; j += 16) {
00237 dst2 = dst;
00238 bw = 16;
00239 if(j + 16 > h) bh = h - j;
00240 for(i = 0; i < w; i += 16, dst2 += 16 * bpp) {
00241 if(src - ssrc >= ssize) {
00242 av_log(c->avctx, AV_LOG_ERROR, "Premature end of data!\n");
00243 return -1;
00244 }
00245 if(i + 16 > w) bw = w - i;
00246 flags = *src++;
00247 if(flags & HT_RAW) {
00248 if(src - ssrc > ssize - bw * bh * bpp) {
00249 av_log(c->avctx, AV_LOG_ERROR, "Premature end of data!\n");
00250 return -1;
00251 }
00252 paint_raw(dst2, bw, bh, src, bpp, c->bigendian, stride);
00253 src += bw * bh * bpp;
00254 } else {
00255 if(flags & HT_BKG) {
00256 bg = vmnc_get_pixel(src, bpp, c->bigendian); src += bpp;
00257 }
00258 if(flags & HT_FG) {
00259 fg = vmnc_get_pixel(src, bpp, c->bigendian); src += bpp;
00260 }
00261 rects = 0;
00262 if(flags & HT_SUB)
00263 rects = *src++;
00264 color = !!(flags & HT_CLR);
00265
00266 paint_rect(dst2, 0, 0, bw, bh, bg, bpp, stride);
00267
00268 if(src - ssrc > ssize - rects * (color * bpp + 2)) {
00269 av_log(c->avctx, AV_LOG_ERROR, "Premature end of data!\n");
00270 return -1;
00271 }
00272 for(k = 0; k < rects; k++) {
00273 if(color) {
00274 fg = vmnc_get_pixel(src, bpp, c->bigendian); src += bpp;
00275 }
00276 xy = *src++;
00277 wh = *src++;
00278 paint_rect(dst2, xy >> 4, xy & 0xF, (wh>>4)+1, (wh & 0xF)+1, fg, bpp, stride);
00279 }
00280 }
00281 }
00282 dst += stride * 16;
00283 }
00284 return src - ssrc;
00285 }
00286
00287 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
00288 {
00289 const uint8_t *buf = avpkt->data;
00290 int buf_size = avpkt->size;
00291 VmncContext * const c = avctx->priv_data;
00292 uint8_t *outptr;
00293 const uint8_t *src = buf;
00294 int dx, dy, w, h, depth, enc, chunks, res, size_left;
00295
00296 c->pic.reference = 1;
00297 c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
00298 if(avctx->reget_buffer(avctx, &c->pic) < 0){
00299 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
00300 return -1;
00301 }
00302
00303 c->pic.key_frame = 0;
00304 c->pic.pict_type = AV_PICTURE_TYPE_P;
00305
00306
00307 if(c->screendta) {
00308 int i;
00309 w = c->cur_w;
00310 if(c->width < c->cur_x + w) w = c->width - c->cur_x;
00311 h = c->cur_h;
00312 if(c->height < c->cur_y + h) h = c->height - c->cur_y;
00313 dx = c->cur_x;
00314 if(dx < 0) {
00315 w += dx;
00316 dx = 0;
00317 }
00318 dy = c->cur_y;
00319 if(dy < 0) {
00320 h += dy;
00321 dy = 0;
00322 }
00323 if((w > 0) && (h > 0)) {
00324 outptr = c->pic.data[0] + dx * c->bpp2 + dy * c->pic.linesize[0];
00325 for(i = 0; i < h; i++) {
00326 memcpy(outptr, c->screendta + i * c->cur_w * c->bpp2, w * c->bpp2);
00327 outptr += c->pic.linesize[0];
00328 }
00329 }
00330 }
00331 src += 2;
00332 chunks = AV_RB16(src); src += 2;
00333 while(chunks--) {
00334 dx = AV_RB16(src); src += 2;
00335 dy = AV_RB16(src); src += 2;
00336 w = AV_RB16(src); src += 2;
00337 h = AV_RB16(src); src += 2;
00338 enc = AV_RB32(src); src += 4;
00339 outptr = c->pic.data[0] + dx * c->bpp2 + dy * c->pic.linesize[0];
00340 size_left = buf_size - (src - buf);
00341 switch(enc) {
00342 case MAGIC_WMVd:
00343 if(size_left < 2 + w * h * c->bpp2 * 2) {
00344 av_log(avctx, AV_LOG_ERROR, "Premature end of data! (need %i got %i)\n", 2 + w * h * c->bpp2 * 2, size_left);
00345 return -1;
00346 }
00347 src += 2;
00348 c->cur_w = w;
00349 c->cur_h = h;
00350 c->cur_hx = dx;
00351 c->cur_hy = dy;
00352 if((c->cur_hx > c->cur_w) || (c->cur_hy > c->cur_h)) {
00353 av_log(avctx, AV_LOG_ERROR, "Cursor hot spot is not in image: %ix%i of %ix%i cursor size\n", c->cur_hx, c->cur_hy, c->cur_w, c->cur_h);
00354 c->cur_hx = c->cur_hy = 0;
00355 }
00356 c->curbits = av_realloc(c->curbits, c->cur_w * c->cur_h * c->bpp2);
00357 c->curmask = av_realloc(c->curmask, c->cur_w * c->cur_h * c->bpp2);
00358 c->screendta = av_realloc(c->screendta, c->cur_w * c->cur_h * c->bpp2);
00359 load_cursor(c, src);
00360 src += w * h * c->bpp2 * 2;
00361 break;
00362 case MAGIC_WMVe:
00363 src += 2;
00364 break;
00365 case MAGIC_WMVf:
00366 c->cur_x = dx - c->cur_hx;
00367 c->cur_y = dy - c->cur_hy;
00368 break;
00369 case MAGIC_WMVg:
00370 src += 10;
00371 break;
00372 case MAGIC_WMVh:
00373 src += 4;
00374 break;
00375 case MAGIC_WMVi:
00376 c->pic.key_frame = 1;
00377 c->pic.pict_type = AV_PICTURE_TYPE_I;
00378 depth = *src++;
00379 if(depth != c->bpp) {
00380 av_log(avctx, AV_LOG_INFO, "Depth mismatch. Container %i bpp, Frame data: %i bpp\n", c->bpp, depth);
00381 }
00382 src++;
00383 c->bigendian = *src++;
00384 if(c->bigendian & (~1)) {
00385 av_log(avctx, AV_LOG_INFO, "Invalid header: bigendian flag = %i\n", c->bigendian);
00386 return -1;
00387 }
00388
00389 src += 13;
00390 break;
00391 case MAGIC_WMVj:
00392 src += 2;
00393 break;
00394 case 0x00000000:
00395 if((dx + w > c->width) || (dy + h > c->height)) {
00396 av_log(avctx, AV_LOG_ERROR, "Incorrect frame size: %ix%i+%ix%i of %ix%i\n", w, h, dx, dy, c->width, c->height);
00397 return -1;
00398 }
00399 if(size_left < w * h * c->bpp2) {
00400 av_log(avctx, AV_LOG_ERROR, "Premature end of data! (need %i got %i)\n", w * h * c->bpp2, size_left);
00401 return -1;
00402 }
00403 paint_raw(outptr, w, h, src, c->bpp2, c->bigendian, c->pic.linesize[0]);
00404 src += w * h * c->bpp2;
00405 break;
00406 case 0x00000005:
00407 if((dx + w > c->width) || (dy + h > c->height)) {
00408 av_log(avctx, AV_LOG_ERROR, "Incorrect frame size: %ix%i+%ix%i of %ix%i\n", w, h, dx, dy, c->width, c->height);
00409 return -1;
00410 }
00411 res = decode_hextile(c, outptr, src, size_left, w, h, c->pic.linesize[0]);
00412 if(res < 0)
00413 return -1;
00414 src += res;
00415 break;
00416 default:
00417 av_log(avctx, AV_LOG_ERROR, "Unsupported block type 0x%08X\n", enc);
00418 chunks = 0;
00419 }
00420 }
00421 if(c->screendta){
00422 int i;
00423
00424 w = c->cur_w;
00425 if(c->width < c->cur_x + w) w = c->width - c->cur_x;
00426 h = c->cur_h;
00427 if(c->height < c->cur_y + h) h = c->height - c->cur_y;
00428 dx = c->cur_x;
00429 if(dx < 0) {
00430 w += dx;
00431 dx = 0;
00432 }
00433 dy = c->cur_y;
00434 if(dy < 0) {
00435 h += dy;
00436 dy = 0;
00437 }
00438 if((w > 0) && (h > 0)) {
00439 outptr = c->pic.data[0] + dx * c->bpp2 + dy * c->pic.linesize[0];
00440 for(i = 0; i < h; i++) {
00441 memcpy(c->screendta + i * c->cur_w * c->bpp2, outptr, w * c->bpp2);
00442 outptr += c->pic.linesize[0];
00443 }
00444 outptr = c->pic.data[0];
00445 put_cursor(outptr, c->pic.linesize[0], c, c->cur_x, c->cur_y);
00446 }
00447 }
00448 *data_size = sizeof(AVFrame);
00449 *(AVFrame*)data = c->pic;
00450
00451
00452 return buf_size;
00453 }
00454
00455
00456
00457
00458
00459
00460
00461
00462 static av_cold int decode_init(AVCodecContext *avctx)
00463 {
00464 VmncContext * const c = avctx->priv_data;
00465
00466 c->avctx = avctx;
00467
00468 c->width = avctx->width;
00469 c->height = avctx->height;
00470
00471 c->bpp = avctx->bits_per_coded_sample;
00472 c->bpp2 = c->bpp/8;
00473 avcodec_get_frame_defaults(&c->pic);
00474
00475 switch(c->bpp){
00476 case 8:
00477 avctx->pix_fmt = PIX_FMT_PAL8;
00478 break;
00479 case 16:
00480 avctx->pix_fmt = PIX_FMT_RGB555;
00481 break;
00482 case 32:
00483 avctx->pix_fmt = PIX_FMT_RGB32;
00484 break;
00485 default:
00486 av_log(avctx, AV_LOG_ERROR, "Unsupported bitdepth %i\n", c->bpp);
00487 return AVERROR_INVALIDDATA;
00488 }
00489
00490 return 0;
00491 }
00492
00493
00494
00495
00496
00497
00498
00499
00500 static av_cold int decode_end(AVCodecContext *avctx)
00501 {
00502 VmncContext * const c = avctx->priv_data;
00503
00504 if (c->pic.data[0])
00505 avctx->release_buffer(avctx, &c->pic);
00506
00507 av_free(c->curbits);
00508 av_free(c->curmask);
00509 av_free(c->screendta);
00510 return 0;
00511 }
00512
00513 AVCodec ff_vmnc_decoder = {
00514 "vmnc",
00515 AVMEDIA_TYPE_VIDEO,
00516 CODEC_ID_VMNC,
00517 sizeof(VmncContext),
00518 decode_init,
00519 NULL,
00520 decode_end,
00521 decode_frame,
00522 CODEC_CAP_DR1,
00523 .long_name = NULL_IF_CONFIG_SMALL("VMware Screen Codec / VMware Video"),
00524 };
00525
