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