cap_avi.c

   1 #include "quakedef.h"
   2 #include "cap_avi.h"
   3
   4 #define AVI_MASTER_INDEX_SIZE 640 // GB ought to be enough for anyone
   5
   6 typedef struct capturevideostate_avi_formatspecific_s
   7 {
   8         // AVI stuff
   9         fs_offset_t videofile_firstchunkframes_offset;
  10         fs_offset_t videofile_totalframes_offset1;
  11         fs_offset_t videofile_totalframes_offset2;
  12         fs_offset_t videofile_totalsampleframes_offset;
  13         int videofile_ix_master_audio_inuse;
  14         fs_offset_t videofile_ix_master_audio_inuse_offset;
  15         fs_offset_t videofile_ix_master_audio_start_offset;
  16         int videofile_ix_master_video_inuse;
  17         fs_offset_t videofile_ix_master_video_inuse_offset;
  18         fs_offset_t videofile_ix_master_video_start_offset;
  19         fs_offset_t videofile_ix_movistart;
  20         fs_offset_t position;
  21         qboolean canseek;
  22         sizebuf_t riffbuffer;
  23         unsigned char riffbufferdata[128];
  24         sizebuf_t riffindexbuffer;
  25         int riffstacklevel;
  26         fs_offset_t riffstackstartoffset[4];
  27         fs_offset_t riffstacksizehint[4];
  28         const char *riffstackfourcc[4];
  29 }
  30 capturevideostate_avi_formatspecific_t;
  31 #define LOAD_FORMATSPECIFIC_AVI() capturevideostate_avi_formatspecific_t *format = (capturevideostate_avi_formatspecific_t *) cls.capturevideo.formatspecific
  32
  33 static void SCR_CaptureVideo_RIFF_Start(void)
  34 {
  35         LOAD_FORMATSPECIFIC_AVI();
  36         memset(&format->riffbuffer, 0, sizeof(sizebuf_t));
  37         format->riffbuffer.maxsize = sizeof(format->riffbufferdata);
  38         format->riffbuffer.data = format->riffbufferdata;
  39         format->position = 0;
  40 }
  41
  42 static void SCR_CaptureVideo_RIFF_Flush(void)
  43 {
  44         LOAD_FORMATSPECIFIC_AVI();
  45         if (format->riffbuffer.cursize > 0)
  46         {
  47                 if (!FS_Write(cls.capturevideo.videofile, format->riffbuffer.data, format->riffbuffer.cursize))
  48                         cls.capturevideo.error = true;
  49                 format->position += format->riffbuffer.cursize;
  50                 format->riffbuffer.cursize = 0;
  51                 format->riffbuffer.overflowed = false;
  52         }
  53 }
  54
  55 static void SCR_CaptureVideo_RIFF_FlushNoIncrease(void)
  56 {
  57         LOAD_FORMATSPECIFIC_AVI();
  58         if (format->riffbuffer.cursize > 0)
  59         {
  60                 if (!FS_Write(cls.capturevideo.videofile, format->riffbuffer.data, format->riffbuffer.cursize))
  61                         cls.capturevideo.error = true;
  62                 format->riffbuffer.cursize = 0;
  63                 format->riffbuffer.overflowed = false;
  64         }
  65 }
  66
  67 static void SCR_CaptureVideo_RIFF_WriteBytes(const unsigned char *data, size_t size)
  68 {
  69         LOAD_FORMATSPECIFIC_AVI();
  70         SCR_CaptureVideo_RIFF_Flush();
  71         if (!FS_Write(cls.capturevideo.videofile, data, size))
  72                 cls.capturevideo.error = true;
  73         format->position += size;
  74 }
  75
  76 static void SCR_CaptureVideo_RIFF_Write32(int n)
  77 {
  78         LOAD_FORMATSPECIFIC_AVI();
  79         if (format->riffbuffer.cursize + 4 > format->riffbuffer.maxsize)
  80                 SCR_CaptureVideo_RIFF_Flush();
  81         MSG_WriteLong(&format->riffbuffer, n);
  82 }
  83
  84 static void SCR_CaptureVideo_RIFF_Write16(int n)
  85 {
  86         LOAD_FORMATSPECIFIC_AVI();
  87         if (format->riffbuffer.cursize + 2 > format->riffbuffer.maxsize)
  88                 SCR_CaptureVideo_RIFF_Flush();
  89         MSG_WriteShort(&format->riffbuffer, n);
  90 }
  91
  92 static void SCR_CaptureVideo_RIFF_WriteFourCC(const char *chunkfourcc)
  93 {
  94         LOAD_FORMATSPECIFIC_AVI();
  95         if (format->riffbuffer.cursize + (int)strlen(chunkfourcc) > format->riffbuffer.maxsize)
  96                 SCR_CaptureVideo_RIFF_Flush();
  97         MSG_WriteUnterminatedString(&format->riffbuffer, chunkfourcc);
  98 }
  99
 100 static void SCR_CaptureVideo_RIFF_WriteTerminatedString(const char *string)
 101 {
 102         LOAD_FORMATSPECIFIC_AVI();
 103         if (format->riffbuffer.cursize + (int)strlen(string) > format->riffbuffer.maxsize)
 104                 SCR_CaptureVideo_RIFF_Flush();
 105         MSG_WriteString(&format->riffbuffer, string);
 106 }
 107
 108 static fs_offset_t SCR_CaptureVideo_RIFF_GetPosition(void)
 109 {
 110         LOAD_FORMATSPECIFIC_AVI();
 111         SCR_CaptureVideo_RIFF_Flush();
 112         //return FS_Tell(cls.capturevideo.videofile);
 113         return format->position;
 114 }
 115
 116 static void SCR_CaptureVideo_RIFF_Push(const char *chunkfourcc, const char *listtypefourcc, fs_offset_t sizeHint)
 117 {
 118         LOAD_FORMATSPECIFIC_AVI();
 119         if (listtypefourcc && sizeHint >= 0)
 120                 sizeHint += 4; // size hint is for INNER size
 121         SCR_CaptureVideo_RIFF_WriteFourCC(chunkfourcc);
 122         SCR_CaptureVideo_RIFF_Write32(sizeHint);
 123         SCR_CaptureVideo_RIFF_Flush();
 124         format->riffstacksizehint[format->riffstacklevel] = sizeHint;
 125         format->riffstackstartoffset[format->riffstacklevel] = SCR_CaptureVideo_RIFF_GetPosition();
 126         format->riffstackfourcc[format->riffstacklevel] = chunkfourcc;
 127         ++format->riffstacklevel;
 128         if (listtypefourcc)
 129                 SCR_CaptureVideo_RIFF_WriteFourCC(listtypefourcc);
 130 }
 131
 132 static void SCR_CaptureVideo_RIFF_Pop(void)
 133 {
 134         LOAD_FORMATSPECIFIC_AVI();
 135         fs_offset_t offset, sizehint;
 136         int x;
 137         unsigned char sizebytes[4];
 138         // write out the chunk size and then return to the current file position
 139         format->riffstacklevel--;
 140         offset = SCR_CaptureVideo_RIFF_GetPosition();
 141
 142         sizehint = format->riffstacksizehint[format->riffstacklevel];
 143         x = (int)(offset - (format->riffstackstartoffset[format->riffstacklevel]));
 144
 145         if(x != sizehint)
 146         {
 147                 if(sizehint != -1)
 148                 {
 149                         int i;
 150                         Con_Printf("WARNING: invalid size hint %d when writing video data (actual size: %d)\n", (int) sizehint, x);
 151                         for(i = 0; i <= format->riffstacklevel; ++i)
 152                         {
 153                                 Con_Printf("  RIFF level %d = %s\n", i, format->riffstackfourcc[i]);
 154                         }
 155                 }
 156                 sizebytes[0] = (x) & 0xff;sizebytes[1] = (x >> 8) & 0xff;sizebytes[2] = (x >> 16) & 0xff;sizebytes[3] = (x >> 24) & 0xff;
 157                 if(FS_Seek(cls.capturevideo.videofile, -(x + 4), SEEK_END) >= 0)
 158                 {
 159                         FS_Write(cls.capturevideo.videofile, sizebytes, 4);
 160                 }
 161                 FS_Seek(cls.capturevideo.videofile, 0, SEEK_END);
 162         }
 163
 164         if (offset & 1)
 165         {
 166                 SCR_CaptureVideo_RIFF_WriteBytes((unsigned char *) "\0", 1);
 167         }
 168 }
 169
 170 static void GrowBuf(sizebuf_t *buf, int extralen)
 171 {
 172         if(buf->cursize + extralen > buf->maxsize)
 173         {
 174                 int oldsize = buf->maxsize;
 175                 unsigned char *olddata;
 176                 olddata = buf->data;
 177                 buf->maxsize = max(buf->maxsize * 2, 4096);
 178                 buf->data = (unsigned char *) Mem_Alloc(tempmempool, buf->maxsize);
 179                 if(olddata)
 180                 {
 181                         memcpy(buf->data, olddata, oldsize);
 182                         Mem_Free(olddata);
 183                 }
 184         }
 185 }
 186
 187 static void SCR_CaptureVideo_RIFF_IndexEntry(const char *chunkfourcc, int chunksize, int flags)
 188 {
 189         LOAD_FORMATSPECIFIC_AVI();
 190         if(!format->canseek)
 191                 Host_Error("SCR_CaptureVideo_RIFF_IndexEntry called on non-seekable AVI");
 192
 193         if (format->riffstacklevel != 2)
 194                 Sys_Error("SCR_Capturevideo_RIFF_IndexEntry: RIFF stack level is %i (should be 2)\n", format->riffstacklevel);
 195         GrowBuf(&format->riffindexbuffer, 16);
 196         SCR_CaptureVideo_RIFF_Flush();
 197         MSG_WriteUnterminatedString(&format->riffindexbuffer, chunkfourcc);
 198         MSG_WriteLong(&format->riffindexbuffer, flags);
 199         MSG_WriteLong(&format->riffindexbuffer, (int)FS_Tell(cls.capturevideo.videofile) - format->riffstackstartoffset[1]);
 200         MSG_WriteLong(&format->riffindexbuffer, chunksize);
 201 }
 202
 203 static void SCR_CaptureVideo_RIFF_MakeIxChunk(const char *fcc, const char *dwChunkId, fs_offset_t masteridx_counter, int *masteridx_count, fs_offset_t masteridx_start)
 204 {
 205         LOAD_FORMATSPECIFIC_AVI();
 206         int nMatching;
 207         int i;
 208         fs_offset_t ix = SCR_CaptureVideo_RIFF_GetPosition();
 209         fs_offset_t pos, sz;
 210
 211         if(!format->canseek)
 212                 Host_Error("SCR_CaptureVideo_RIFF_MakeIxChunk called on non-seekable AVI");
 213
 214         if(*masteridx_count >= AVI_MASTER_INDEX_SIZE)
 215                 return;
 216
 217         nMatching = 0; // go through index and enumerate them
 218         for(i = 0; i < format->riffindexbuffer.cursize; i += 16)
 219                 if(!memcmp(format->riffindexbuffer.data + i, dwChunkId, 4))
 220                         ++nMatching;
 221
 222         sz = 2+2+4+4+4+4+4;
 223         for(i = 0; i < format->riffindexbuffer.cursize; i += 16)
 224                 if(!memcmp(format->riffindexbuffer.data + i, dwChunkId, 4))
 225                         sz += 8;
 226
 227         SCR_CaptureVideo_RIFF_Push(fcc, NULL, sz);
 228         SCR_CaptureVideo_RIFF_Write16(2); // wLongsPerEntry
 229         SCR_CaptureVideo_RIFF_Write16(0x0100); // bIndexType=1, bIndexSubType=0
 230         SCR_CaptureVideo_RIFF_Write32(nMatching); // nEntriesInUse
 231         SCR_CaptureVideo_RIFF_WriteFourCC(dwChunkId); // dwChunkId
 232         SCR_CaptureVideo_RIFF_Write32(format->videofile_ix_movistart & (fs_offset_t) 0xFFFFFFFFu);
 233         SCR_CaptureVideo_RIFF_Write32(((fs_offset_t) format->videofile_ix_movistart) >> 32);
 234         SCR_CaptureVideo_RIFF_Write32(0); // dwReserved
 235
 236         for(i = 0; i < format->riffindexbuffer.cursize; i += 16)
 237                 if(!memcmp(format->riffindexbuffer.data + i, dwChunkId, 4))
 238                 {
 239                         unsigned int *p = (unsigned int *) (format->riffindexbuffer.data + i);
 240                         unsigned int flags = p[1];
 241                         unsigned int rpos = p[2];
 242                         unsigned int size = p[3];
 243                         size &= ~0x80000000;
 244                         if(!(flags & 0x10)) // no keyframe?
 245                                 size |= 0x80000000;
 246                         SCR_CaptureVideo_RIFF_Write32(rpos + 8);
 247                         SCR_CaptureVideo_RIFF_Write32(size);
 248                 }
 249
 250         SCR_CaptureVideo_RIFF_Flush();
 251         SCR_CaptureVideo_RIFF_Pop();
 252         pos = SCR_CaptureVideo_RIFF_GetPosition();
 253
 254         if(FS_Seek(cls.capturevideo.videofile, masteridx_start + 16 * *masteridx_count, SEEK_SET) >= 0)
 255         {
 256                 SCR_CaptureVideo_RIFF_Write32(ix & (fs_offset_t) 0xFFFFFFFFu);
 257                 SCR_CaptureVideo_RIFF_Write32(((fs_offset_t) ix) >> 32);
 258                 SCR_CaptureVideo_RIFF_Write32(pos - ix);
 259                 SCR_CaptureVideo_RIFF_Write32(nMatching);
 260                 SCR_CaptureVideo_RIFF_FlushNoIncrease();
 261         }
 262
 263         if(FS_Seek(cls.capturevideo.videofile, masteridx_counter, SEEK_SET) >= 0)
 264         {
 265                 SCR_CaptureVideo_RIFF_Write32(++*masteridx_count);
 266                 SCR_CaptureVideo_RIFF_FlushNoIncrease();
 267         }
 268
 269         FS_Seek(cls.capturevideo.videofile, 0, SEEK_END); // return value doesn't matter here
 270 }
 271
 272 static void SCR_CaptureVideo_RIFF_Finish(qboolean final)
 273 {
 274         LOAD_FORMATSPECIFIC_AVI();
 275         // close the "movi" list
 276         SCR_CaptureVideo_RIFF_Pop();
 277         if(format->videofile_ix_master_video_inuse_offset)
 278                 SCR_CaptureVideo_RIFF_MakeIxChunk("ix00", "00dc", format->videofile_ix_master_video_inuse_offset, &format->videofile_ix_master_video_inuse, format->videofile_ix_master_video_start_offset);
 279         if(format->videofile_ix_master_audio_inuse_offset)
 280                 SCR_CaptureVideo_RIFF_MakeIxChunk("ix01", "01wb", format->videofile_ix_master_audio_inuse_offset, &format->videofile_ix_master_audio_inuse, format->videofile_ix_master_audio_start_offset);
 281         // write the idx1 chunk that we've been building while saving the frames (for old style players)
 282         if(final && format->videofile_firstchunkframes_offset)
 283         // TODO replace index creating by OpenDML ix##/##ix/indx chunk so it works for more than one AVI part too
 284         {
 285                 SCR_CaptureVideo_RIFF_Push("idx1", NULL, format->riffindexbuffer.cursize);
 286                 SCR_CaptureVideo_RIFF_WriteBytes(format->riffindexbuffer.data, format->riffindexbuffer.cursize);
 287                 SCR_CaptureVideo_RIFF_Pop();
 288         }
 289         format->riffindexbuffer.cursize = 0;
 290         // pop the RIFF chunk itself
 291         while (format->riffstacklevel > 0)
 292                 SCR_CaptureVideo_RIFF_Pop();
 293         SCR_CaptureVideo_RIFF_Flush();
 294         if(format->videofile_firstchunkframes_offset)
 295         {
 296                 Con_DPrintf("Finishing first chunk (%d frames)\n", cls.capturevideo.frame);
 297                 if(FS_Seek(cls.capturevideo.videofile, format->videofile_firstchunkframes_offset, SEEK_SET) >= 0)
 298                 {
 299                         SCR_CaptureVideo_RIFF_Write32(cls.capturevideo.frame);
 300                         SCR_CaptureVideo_RIFF_FlushNoIncrease();
 301                 }
 302                 FS_Seek(cls.capturevideo.videofile, 0, SEEK_END);
 303                 format->videofile_firstchunkframes_offset = 0;
 304         }
 305         else
 306                 Con_DPrintf("Finishing another chunk (%d frames)\n", cls.capturevideo.frame);
 307 }
 308
 309 static void SCR_CaptureVideo_RIFF_OverflowCheck(int framesize)
 310 {
 311         LOAD_FORMATSPECIFIC_AVI();
 312         fs_offset_t cursize, curfilesize;
 313         if (format->riffstacklevel != 2)
 314                 Sys_Error("SCR_CaptureVideo_RIFF_OverflowCheck: chunk stack leakage!\n");
 315
 316         if(!format->canseek)
 317                 return;
 318
 319         // check where we are in the file
 320         SCR_CaptureVideo_RIFF_Flush();
 321         cursize = SCR_CaptureVideo_RIFF_GetPosition() - format->riffstackstartoffset[0];
 322         curfilesize = SCR_CaptureVideo_RIFF_GetPosition();
 323
 324         // if this would overflow the windows limit of 1GB per RIFF chunk, we need
 325         // to close the current RIFF chunk and open another for future frames
 326         if (8 + cursize + framesize + format->riffindexbuffer.cursize + 8 + format->riffindexbuffer.cursize + 64 > 1<<30) // note that the Ix buffer takes less space... I just don't dare to / 2 here now... sorry, maybe later
 327         {
 328                 SCR_CaptureVideo_RIFF_Finish(false);
 329                 // begin a new 1GB extended section of the AVI
 330                 SCR_CaptureVideo_RIFF_Push("RIFF", "AVIX", -1);
 331                 SCR_CaptureVideo_RIFF_Push("LIST", "movi", -1);
 332                 format->videofile_ix_movistart = format->riffstackstartoffset[1];
 333         }
 334 }
 335
 336 // converts from BGRA32 to I420 colorspace (identical to YV12 except chroma plane order is reversed), this colorspace is handled by the Intel(r) 4:2:0 codec on Windows
 337 static void SCR_CaptureVideo_ConvertFrame_BGRA_to_I420_flip(int width, int height, unsigned char *instart, unsigned char *outstart)
 338 {
 339         int x, y;
 340         int blockr, blockg, blockb;
 341         int outoffset = (width/2)*(height/2);
 342         unsigned char *b, *out;
 343         // process one line at a time, and CbCr every other line at 2 pixel intervals
 344         for (y = 0;y < height;y++)
 345         {
 346                 // 1x1 Y
 347                 for (b = instart + (height-1-y)*width*4, out = outstart + y*width, x = 0;x < width;x++, b += 4, out++)
 348                 {
 349                         blockr = b[2];
 350                         blockg = b[1];
 351                         blockb = b[0];
 352                         *out = cls.capturevideo.yuvnormalizetable[0][cls.capturevideo.rgbtoyuvscaletable[0][0][blockr] + cls.capturevideo.rgbtoyuvscaletable[0][1][blockg] + cls.capturevideo.rgbtoyuvscaletable[0][2][blockb]];
 353                 }
 354                 if ((y & 1) == 0)
 355                 {
 356                         // 2x2 Cr and Cb planes
 357                         int inpitch = width*4;
 358                         for (b = instart + (height-2-y)*width*4, out = outstart + width*height + (y/2)*(width/2), x = 0;x < width/2;x++, b += 8, out++)
 359                         {
 360                                 blockr = (b[2] + b[6] + b[inpitch+2] + b[inpitch+6]) >> 2;
 361                                 blockg = (b[1] + b[5] + b[inpitch+1] + b[inpitch+5]) >> 2;
 362                                 blockb = (b[0] + b[4] + b[inpitch+0] + b[inpitch+4]) >> 2;
 363                                 // Cr
 364                                 out[0        ] = cls.capturevideo.yuvnormalizetable[1][cls.capturevideo.rgbtoyuvscaletable[1][0][blockr] + cls.capturevideo.rgbtoyuvscaletable[1][1][blockg] + cls.capturevideo.rgbtoyuvscaletable[1][2][blockb] + 128];
 365                                 // Cb
 366                                 out[outoffset] = cls.capturevideo.yuvnormalizetable[2][cls.capturevideo.rgbtoyuvscaletable[2][0][blockr] + cls.capturevideo.rgbtoyuvscaletable[2][1][blockg] + cls.capturevideo.rgbtoyuvscaletable[2][2][blockb] + 128];
 367                         }
 368                 }
 369         }
 370 }
 371
 372 static void SCR_CaptureVideo_Avi_VideoFrames(int num)
 373 {
 374         LOAD_FORMATSPECIFIC_AVI();
 375         int x = 0, width = cls.capturevideo.width, height = cls.capturevideo.height;
 376         unsigned char *in, *out;
 377         // FIXME: width/height must be multiple of 2, enforce this?
 378         in = cls.capturevideo.outbuffer;
 379         out = cls.capturevideo.outbuffer + width*height*4;
 380         SCR_CaptureVideo_ConvertFrame_BGRA_to_I420_flip(width, height, in, out);
 381         x = width*height+(width/2)*(height/2)*2;
 382         while(num-- > 0)
 383         {
 384                 if(format->canseek)
 385                 {
 386                         SCR_CaptureVideo_RIFF_OverflowCheck(8 + x);
 387                         SCR_CaptureVideo_RIFF_IndexEntry("00dc", x, 0x10); // AVIIF_KEYFRAME
 388                 }
 389
 390                 if(!format->canseek)
 391                 {
 392                         SCR_CaptureVideo_RIFF_Push("RIFF", "AVIX", 12+8+x);
 393                         SCR_CaptureVideo_RIFF_Push("LIST", "movi", 8+x);
 394                 }
 395                 SCR_CaptureVideo_RIFF_Push("00dc", NULL, x);
 396                 SCR_CaptureVideo_RIFF_WriteBytes(out, x);
 397                 SCR_CaptureVideo_RIFF_Pop();
 398                 if(!format->canseek)
 399                 {
 400                         SCR_CaptureVideo_RIFF_Pop();
 401                         SCR_CaptureVideo_RIFF_Pop();
 402                 }
 403         }
 404 }
 405
 406 void SCR_CaptureVideo_Avi_EndVideo(void)
 407 {
 408         LOAD_FORMATSPECIFIC_AVI();
 409
 410         if(format->canseek)
 411         {
 412                 // close any open chunks
 413                 SCR_CaptureVideo_RIFF_Finish(true);
 414
 415                 // go back and fix the video frames and audio samples fields
 416                 if(format->videofile_totalframes_offset1)
 417                         if(FS_Seek(cls.capturevideo.videofile, format->videofile_totalframes_offset1, SEEK_SET) >= 0)
 418                         {
 419                                 SCR_CaptureVideo_RIFF_Write32(cls.capturevideo.frame);
 420                                 SCR_CaptureVideo_RIFF_FlushNoIncrease();
 421                         }
 422                 if(format->videofile_totalframes_offset2)
 423                         if(FS_Seek(cls.capturevideo.videofile, format->videofile_totalframes_offset2, SEEK_SET) >= 0)
 424                         {
 425                                 SCR_CaptureVideo_RIFF_Write32(cls.capturevideo.frame);
 426                                 SCR_CaptureVideo_RIFF_FlushNoIncrease();
 427                         }
 428                 if (cls.capturevideo.soundrate)
 429                 {
 430                         if(format->videofile_totalsampleframes_offset)
 431                                 if(FS_Seek(cls.capturevideo.videofile, format->videofile_totalsampleframes_offset, SEEK_SET) >= 0)
 432                                 {
 433                                         SCR_CaptureVideo_RIFF_Write32(cls.capturevideo.soundsampleframe);
 434                                         SCR_CaptureVideo_RIFF_FlushNoIncrease();
 435                                 }
 436                 }
 437         }
 438
 439         if (format->riffindexbuffer.data)
 440         {
 441                 Mem_Free(format->riffindexbuffer.data);
 442                 format->riffindexbuffer.data = NULL;
 443         }
 444
 445         FS_Close(cls.capturevideo.videofile);
 446         cls.capturevideo.videofile = NULL;
 447
 448         Mem_Free(format);
 449 }
 450
 451 void SCR_CaptureVideo_Avi_SoundFrame(const portable_sampleframe_t *paintbuffer, size_t length)
 452 {
 453         LOAD_FORMATSPECIFIC_AVI();
 454         int x;
 455         unsigned char bufstereo16le[PAINTBUFFER_SIZE * 4];
 456         unsigned char* out_ptr;
 457         size_t i;
 458
 459         // write the sound buffer as little endian 16bit interleaved stereo
 460         for(i = 0, out_ptr = bufstereo16le; i < length; i++, out_ptr += 4)
 461         {
 462                 int n0, n1;
 463
 464                 n0 = paintbuffer[i].sample[0];
 465                 n0 = bound(-32768, n0, 32767);
 466                 out_ptr[0] = (unsigned char)n0;
 467                 out_ptr[1] = (unsigned char)(n0 >> 8);
 468
 469                 n1 = paintbuffer[i].sample[1];
 470                 n1 = bound(-32768, n1, 32767);
 471                 out_ptr[2] = (unsigned char)n1;
 472                 out_ptr[3] = (unsigned char)(n1 >> 8);
 473         }
 474
 475         x = length*4;
 476         if(format->canseek)
 477         {
 478                 SCR_CaptureVideo_RIFF_OverflowCheck(8 + x);
 479                 SCR_CaptureVideo_RIFF_IndexEntry("01wb", x, 0x10); // AVIIF_KEYFRAME
 480         }
 481
 482         if(!format->canseek)
 483         {
 484                 SCR_CaptureVideo_RIFF_Push("RIFF", "AVIX", 12+8+x);
 485                 SCR_CaptureVideo_RIFF_Push("LIST", "movi", 8+x);
 486         }
 487         SCR_CaptureVideo_RIFF_Push("01wb", NULL, x);
 488         SCR_CaptureVideo_RIFF_WriteBytes(bufstereo16le, x);
 489         SCR_CaptureVideo_RIFF_Pop();
 490         if(!format->canseek)
 491         {
 492                 SCR_CaptureVideo_RIFF_Pop();
 493                 SCR_CaptureVideo_RIFF_Pop();
 494         }
 495 }
 496
 497 void SCR_CaptureVideo_Avi_BeginVideo(void)
 498 {
 499         int width = cls.capturevideo.width;
 500         int height = cls.capturevideo.height;
 501         int n, d;
 502         unsigned int i;
 503         double aspect;
 504
 505         aspect = vid.width / (vid.height * vid_pixelheight.value);
 506
 507         cls.capturevideo.format = CAPTUREVIDEOFORMAT_AVI_I420;
 508         cls.capturevideo.formatextension = "avi";
 509         cls.capturevideo.videofile = FS_OpenRealFile(va("%s.%s", cls.capturevideo.basename, cls.capturevideo.formatextension), "wb", false);
 510         cls.capturevideo.endvideo = SCR_CaptureVideo_Avi_EndVideo;
 511         cls.capturevideo.videoframes = SCR_CaptureVideo_Avi_VideoFrames;
 512         cls.capturevideo.soundframe = SCR_CaptureVideo_Avi_SoundFrame;
 513         cls.capturevideo.formatspecific = Mem_Alloc(tempmempool, sizeof(capturevideostate_avi_formatspecific_t));
 514         {
 515                 LOAD_FORMATSPECIFIC_AVI();
 516                 format->canseek = (FS_Seek(cls.capturevideo.videofile, 0, SEEK_SET) == 0);
 517                 SCR_CaptureVideo_RIFF_Start();
 518                 // enclosing RIFF chunk (there can be multiple of these in >1GB files, the later ones are "AVIX" instead of "AVI " and have no header/stream info)
 519                 SCR_CaptureVideo_RIFF_Push("RIFF", "AVI ", format->canseek ? -1 : 12+(8+56+12+(12+52+8+40+8+68)+(cls.capturevideo.soundrate?(12+12+52+8+18):0)+12+(8+4))+12+(8+(((int) strlen(engineversion) | 1) + 1))+12);
 520                 // AVI main header
 521                 SCR_CaptureVideo_RIFF_Push("LIST", "hdrl", format->canseek ? -1 : 8+56+12+(12+52+8+40+8+68)+(cls.capturevideo.soundrate?(12+12+52+8+18):0)+12+(8+4));
 522                 SCR_CaptureVideo_RIFF_Push("avih", NULL, 56);
 523                 SCR_CaptureVideo_RIFF_Write32((int)(1000000.0 / (cls.capturevideo.framerate / cls.capturevideo.framestep))); // microseconds per frame
 524                 SCR_CaptureVideo_RIFF_Write32(0); // max bytes per second
 525                 SCR_CaptureVideo_RIFF_Write32(0); // padding granularity
 526                 SCR_CaptureVideo_RIFF_Write32(0x910); // flags (AVIF_HASINDEX | AVIF_ISINTERLEAVED | AVIF_TRUSTCKTYPE)
 527                 format->videofile_firstchunkframes_offset = SCR_CaptureVideo_RIFF_GetPosition();
 528                 SCR_CaptureVideo_RIFF_Write32(0); // total frames
 529                 SCR_CaptureVideo_RIFF_Write32(0); // initial frames
 530                 if (cls.capturevideo.soundrate)
 531                         SCR_CaptureVideo_RIFF_Write32(2); // number of streams
 532                 else
 533                         SCR_CaptureVideo_RIFF_Write32(1); // number of streams
 534                 SCR_CaptureVideo_RIFF_Write32(0); // suggested buffer size
 535                 SCR_CaptureVideo_RIFF_Write32(width); // width
 536                 SCR_CaptureVideo_RIFF_Write32(height); // height
 537                 SCR_CaptureVideo_RIFF_Write32(0); // reserved[0]
 538                 SCR_CaptureVideo_RIFF_Write32(0); // reserved[1]
 539                 SCR_CaptureVideo_RIFF_Write32(0); // reserved[2]
 540                 SCR_CaptureVideo_RIFF_Write32(0); // reserved[3]
 541                 SCR_CaptureVideo_RIFF_Pop();
 542                 // video stream info
 543                 SCR_CaptureVideo_RIFF_Push("LIST", "strl", format->canseek ? -1 : 12+52+8+40+8+68);
 544                 SCR_CaptureVideo_RIFF_Push("strh", "vids", 52);
 545                 SCR_CaptureVideo_RIFF_WriteFourCC("I420"); // stream fourcc (I420 colorspace, uncompressed)
 546                 SCR_CaptureVideo_RIFF_Write32(0); // flags
 547                 SCR_CaptureVideo_RIFF_Write16(0); // priority
 548                 SCR_CaptureVideo_RIFF_Write16(0); // language
 549                 SCR_CaptureVideo_RIFF_Write32(0); // initial frames
 550                 // find an ideal divisor for the framerate
 551                 FindFraction(cls.capturevideo.framerate / cls.capturevideo.framestep, &n, &d, 1000);
 552                 SCR_CaptureVideo_RIFF_Write32(d); // samples/second divisor
 553                 SCR_CaptureVideo_RIFF_Write32(n); // samples/second multiplied by divisor
 554                 SCR_CaptureVideo_RIFF_Write32(0); // start
 555                 format->videofile_totalframes_offset1 = SCR_CaptureVideo_RIFF_GetPosition();
 556                 SCR_CaptureVideo_RIFF_Write32(0xFFFFFFFF); // length
 557                 SCR_CaptureVideo_RIFF_Write32(width*height+(width/2)*(height/2)*2); // suggested buffer size
 558                 SCR_CaptureVideo_RIFF_Write32(0); // quality
 559                 SCR_CaptureVideo_RIFF_Write32(0); // sample size
 560                 SCR_CaptureVideo_RIFF_Write16(0); // frame left
 561                 SCR_CaptureVideo_RIFF_Write16(0); // frame top
 562                 SCR_CaptureVideo_RIFF_Write16(width); // frame right
 563                 SCR_CaptureVideo_RIFF_Write16(height); // frame bottom
 564                 SCR_CaptureVideo_RIFF_Pop();
 565                 // video stream format
 566                 SCR_CaptureVideo_RIFF_Push("strf", NULL, 40);
 567                 SCR_CaptureVideo_RIFF_Write32(40); // BITMAPINFO struct size
 568                 SCR_CaptureVideo_RIFF_Write32(width); // width
 569                 SCR_CaptureVideo_RIFF_Write32(height); // height
 570                 SCR_CaptureVideo_RIFF_Write16(3); // planes
 571                 SCR_CaptureVideo_RIFF_Write16(12); // bitcount
 572                 SCR_CaptureVideo_RIFF_WriteFourCC("I420"); // compression
 573                 SCR_CaptureVideo_RIFF_Write32(width*height+(width/2)*(height/2)*2); // size of image
 574                 SCR_CaptureVideo_RIFF_Write32(0); // x pixels per meter
 575                 SCR_CaptureVideo_RIFF_Write32(0); // y pixels per meter
 576                 SCR_CaptureVideo_RIFF_Write32(0); // color used
 577                 SCR_CaptureVideo_RIFF_Write32(0); // color important
 578                 SCR_CaptureVideo_RIFF_Pop();
 579                 // master index
 580                 if(format->canseek)
 581                 {
 582                         SCR_CaptureVideo_RIFF_Push("indx", NULL, -1);
 583                         SCR_CaptureVideo_RIFF_Write16(4); // wLongsPerEntry
 584                         SCR_CaptureVideo_RIFF_Write16(0); // bIndexSubType=0, bIndexType=0
 585                         format->videofile_ix_master_video_inuse_offset = SCR_CaptureVideo_RIFF_GetPosition();
 586                         SCR_CaptureVideo_RIFF_Write32(0); // nEntriesInUse
 587                         SCR_CaptureVideo_RIFF_WriteFourCC("00dc"); // dwChunkId
 588                         SCR_CaptureVideo_RIFF_Write32(0); // dwReserved1
 589                         SCR_CaptureVideo_RIFF_Write32(0); // dwReserved2
 590                         SCR_CaptureVideo_RIFF_Write32(0); // dwReserved3
 591                         format->videofile_ix_master_video_start_offset = SCR_CaptureVideo_RIFF_GetPosition();
 592                         for(i = 0; i < AVI_MASTER_INDEX_SIZE * 4; ++i)
 593                                 SCR_CaptureVideo_RIFF_Write32(0); // fill up later
 594                         SCR_CaptureVideo_RIFF_Pop();
 595                 }
 596                 // extended format (aspect!)
 597                 SCR_CaptureVideo_RIFF_Push("vprp", NULL, 68);
 598                 SCR_CaptureVideo_RIFF_Write32(0); // VideoFormatToken
 599                 SCR_CaptureVideo_RIFF_Write32(0); // VideoStandard
 600                 SCR_CaptureVideo_RIFF_Write32((int)(cls.capturevideo.framerate / cls.capturevideo.framestep)); // dwVerticalRefreshRate (bogus)
 601                 SCR_CaptureVideo_RIFF_Write32(width); // dwHTotalInT
 602                 SCR_CaptureVideo_RIFF_Write32(height); // dwVTotalInLines
 603                 FindFraction(aspect, &n, &d, 1000);
 604                 SCR_CaptureVideo_RIFF_Write32((n << 16) | d); // dwFrameAspectRatio // TODO a word
 605                 SCR_CaptureVideo_RIFF_Write32(width); // dwFrameWidthInPixels
 606                 SCR_CaptureVideo_RIFF_Write32(height); // dwFrameHeightInLines
 607                 SCR_CaptureVideo_RIFF_Write32(1); // nFieldPerFrame
 608                 SCR_CaptureVideo_RIFF_Write32(width); // CompressedBMWidth
 609                 SCR_CaptureVideo_RIFF_Write32(height); // CompressedBMHeight
 610                 SCR_CaptureVideo_RIFF_Write32(width); // ValidBMHeight
 611                 SCR_CaptureVideo_RIFF_Write32(height); // ValidBMWidth
 612                 SCR_CaptureVideo_RIFF_Write32(0); // ValidBMXOffset
 613                 SCR_CaptureVideo_RIFF_Write32(0); // ValidBMYOffset
 614                 SCR_CaptureVideo_RIFF_Write32(0); // ValidBMXOffsetInT
 615                 SCR_CaptureVideo_RIFF_Write32(0); // ValidBMYValidStartLine
 616                 SCR_CaptureVideo_RIFF_Pop();
 617                 SCR_CaptureVideo_RIFF_Pop();
 618                 if (cls.capturevideo.soundrate)
 619                 {
 620                         // audio stream info
 621                         SCR_CaptureVideo_RIFF_Push("LIST", "strl", format->canseek ? -1 : 12+52+8+18);
 622                         SCR_CaptureVideo_RIFF_Push("strh", "auds", 52);
 623                         SCR_CaptureVideo_RIFF_Write32(1); // stream fourcc (PCM audio, uncompressed)
 624                         SCR_CaptureVideo_RIFF_Write32(0); // flags
 625                         SCR_CaptureVideo_RIFF_Write16(0); // priority
 626                         SCR_CaptureVideo_RIFF_Write16(0); // language
 627                         SCR_CaptureVideo_RIFF_Write32(0); // initial frames
 628                         SCR_CaptureVideo_RIFF_Write32(1); // samples/second divisor
 629                         SCR_CaptureVideo_RIFF_Write32((int)(cls.capturevideo.soundrate)); // samples/second multiplied by divisor
 630                         SCR_CaptureVideo_RIFF_Write32(0); // start
 631                         format->videofile_totalsampleframes_offset = SCR_CaptureVideo_RIFF_GetPosition();
 632                         SCR_CaptureVideo_RIFF_Write32(0xFFFFFFFF); // length
 633                         SCR_CaptureVideo_RIFF_Write32(cls.capturevideo.soundrate * 2); // suggested buffer size (this is a half second)
 634                         SCR_CaptureVideo_RIFF_Write32(0); // quality
 635                         SCR_CaptureVideo_RIFF_Write32(4); // sample size
 636                         SCR_CaptureVideo_RIFF_Write16(0); // frame left
 637                         SCR_CaptureVideo_RIFF_Write16(0); // frame top
 638                         SCR_CaptureVideo_RIFF_Write16(0); // frame right
 639                         SCR_CaptureVideo_RIFF_Write16(0); // frame bottom
 640                         SCR_CaptureVideo_RIFF_Pop();
 641                         // audio stream format
 642                         SCR_CaptureVideo_RIFF_Push("strf", NULL, 18);
 643                         SCR_CaptureVideo_RIFF_Write16(1); // format (uncompressed PCM?)
 644                         SCR_CaptureVideo_RIFF_Write16(2); // channels (stereo)
 645                         SCR_CaptureVideo_RIFF_Write32(cls.capturevideo.soundrate); // sampleframes per second
 646                         SCR_CaptureVideo_RIFF_Write32(cls.capturevideo.soundrate * 4); // average bytes per second
 647                         SCR_CaptureVideo_RIFF_Write16(4); // block align
 648                         SCR_CaptureVideo_RIFF_Write16(16); // bits per sample
 649                         SCR_CaptureVideo_RIFF_Write16(0); // size
 650                         SCR_CaptureVideo_RIFF_Pop();
 651                         // master index
 652                         if(format->canseek)
 653                         {
 654                                 SCR_CaptureVideo_RIFF_Push("indx", NULL, -1);
 655                                 SCR_CaptureVideo_RIFF_Write16(4); // wLongsPerEntry
 656                                 SCR_CaptureVideo_RIFF_Write16(0); // bIndexSubType=0, bIndexType=0
 657                                 format->videofile_ix_master_audio_inuse_offset = SCR_CaptureVideo_RIFF_GetPosition();
 658                                 SCR_CaptureVideo_RIFF_Write32(0); // nEntriesInUse
 659                                 SCR_CaptureVideo_RIFF_WriteFourCC("01wb"); // dwChunkId
 660                                 SCR_CaptureVideo_RIFF_Write32(0); // dwReserved1
 661                                 SCR_CaptureVideo_RIFF_Write32(0); // dwReserved2
 662                                 SCR_CaptureVideo_RIFF_Write32(0); // dwReserved3
 663                                 format->videofile_ix_master_audio_start_offset = SCR_CaptureVideo_RIFF_GetPosition();
 664                                 for(i = 0; i < AVI_MASTER_INDEX_SIZE * 4; ++i)
 665                                         SCR_CaptureVideo_RIFF_Write32(0); // fill up later
 666                                 SCR_CaptureVideo_RIFF_Pop();
 667                         }
 668                         SCR_CaptureVideo_RIFF_Pop();
 669                 }
 670
 671                 format->videofile_ix_master_audio_inuse = format->videofile_ix_master_video_inuse = 0;
 672
 673                 // extended header (for total #frames)
 674                 SCR_CaptureVideo_RIFF_Push("LIST", "odml", 8+4);
 675                 SCR_CaptureVideo_RIFF_Push("dmlh", NULL, 4);
 676                 format->videofile_totalframes_offset2 = SCR_CaptureVideo_RIFF_GetPosition();
 677                 SCR_CaptureVideo_RIFF_Write32(0xFFFFFFFF);
 678                 SCR_CaptureVideo_RIFF_Pop();
 679                 SCR_CaptureVideo_RIFF_Pop();
 680
 681                 // close the AVI header list
 682                 SCR_CaptureVideo_RIFF_Pop();
 683                 // software that produced this AVI video file
 684                 SCR_CaptureVideo_RIFF_Push("LIST", "INFO", 8+((strlen(engineversion) | 1) + 1));
 685                 SCR_CaptureVideo_RIFF_Push("ISFT", NULL, strlen(engineversion) + 1);
 686                 SCR_CaptureVideo_RIFF_WriteTerminatedString(engineversion);
 687                 SCR_CaptureVideo_RIFF_Pop();
 688                 // enable this junk filler if you like the LIST movi to always begin at 4KB in the file (why?)
 689 #if 0
 690                 SCR_CaptureVideo_RIFF_Push("JUNK", NULL);
 691                 x = 4096 - SCR_CaptureVideo_RIFF_GetPosition();
 692                 while (x > 0)
 693                 {
 694                         const char *junkfiller = "[ DarkPlaces junk data ]";
 695                         int i = min(x, (int)strlen(junkfiller));
 696                         SCR_CaptureVideo_RIFF_WriteBytes((const unsigned char *)junkfiller, i);
 697                         x -= i;
 698                 }
 699                 SCR_CaptureVideo_RIFF_Pop();
 700 #endif
 701                 SCR_CaptureVideo_RIFF_Pop();
 702                 // begin the actual video section now
 703                 SCR_CaptureVideo_RIFF_Push("LIST", "movi", format->canseek ? -1 : 0);
 704                 format->videofile_ix_movistart = format->riffstackstartoffset[1];
 705                 // we're done with the headers now...
 706                 SCR_CaptureVideo_RIFF_Flush();
 707                 if (format->riffstacklevel != 2)
 708                         Sys_Error("SCR_CaptureVideo_BeginVideo: broken AVI writing code (stack level is %i (should be 2) at end of headers)\n", format->riffstacklevel);
 709
 710                 if(!format->canseek)
 711                 {
 712                         // close the movi immediately
 713                         SCR_CaptureVideo_RIFF_Pop();
 714                         // close the AVI immediately (we'll put all frames into AVIX)
 715                         SCR_CaptureVideo_RIFF_Pop();
 716                 }
 717         }
 718 }