#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <errno.h>#include "config.h"#include "mp_msg.h"#include "help_mp.h"#include "stream.h"#include "demuxer.h"#include "stheader.h"#include "bswap.h"#include "aviheader.h"#define MIN(a,b) (((a)<(b))?(a):(b))static MainAVIHeader avih;extern void print_avih(MainAVIHeader *h, int verbose_level);extern void print_avih_flags(MainAVIHeader *h, int verbose_level);extern void print_strh(AVIStreamHeader *h, int verbose_level);extern void print_wave_header(WAVEFORMATEX *h, int verbose_level);extern void print_video_header(BITMAPINFOHEADER *h, int verbose_level);extern void print_index(AVIINDEXENTRY *idx,int idx_size, int verbose_level);extern void print_avistdindex_chunk(avistdindex_chunk *h, int verbose_level);extern void print_avisuperindex_chunk(avisuperindex_chunk *h, int verbose_level);extern void print_vprp(VideoPropHeader *vprp, int verbose_level);static int odml_get_vstream_id(int id, unsigned char res[]){ unsigned char *p = (unsigned char *)&id; id = le2me_32(id); if (p[2] == 'd') { if (res) { res[0] = p[0]; res[1] = p[1]; } return 1; } return 0;}int avi_idx_cmp(const void *elem1,const void *elem2) { register off_t a = AVI_IDX_OFFSET((AVIINDEXENTRY *)elem1); register off_t b = AVI_IDX_OFFSET((AVIINDEXENTRY *)elem2); return (a > b) - (b > a);}void read_avi_header(demuxer_t *demuxer,int index_mode){sh_audio_t *sh_audio=NULL;sh_video_t *sh_video=NULL;int stream_id=-1;int idxfix_videostream=0;int idxfix_divx=0;avi_priv_t* priv=demuxer->priv;off_t list_end=0;//---- AVI header:priv->idx_size=0;priv->audio_streams=0;while(1){ int id=stream_read_dword_le(demuxer->stream); unsigned chunksize,size2; static int last_fccType=0; char* hdr=NULL; // if(stream_eof(demuxer->stream)) break; // Imply -forceidx if -saveidx is specified if (index_file_save) index_mode = 2; // if(id==mmioFOURCC('L','I','S','T')){ unsigned len=stream_read_dword_le(demuxer->stream); // list size id=stream_read_dword_le(demuxer->stream); // list type mp_msg(MSGT_HEADER,MSGL_DBG2,"LIST %.4s len=%u\n",(char *) &id,len); if(len >= 4) { len -= 4; list_end=stream_tell(demuxer->stream)+((len+1)&(~1)); } else { mp_msg(MSGT_HEADER,MSGL_WARN,MSGTR_MPDEMUX_AVIHDR_EmptyList); list_end = 0; } mp_msg(MSGT_HEADER,MSGL_V,"list_end=0x%X\n",(int)list_end); if(id==listtypeAVIMOVIE){ // found MOVI header if(!demuxer->movi_start) demuxer->movi_start=stream_tell(demuxer->stream); demuxer->movi_end=stream_tell(demuxer->stream)+len; mp_msg(MSGT_HEADER,MSGL_V,MSGTR_MPDEMUX_AVIHDR_FoundMovieAt,(int)demuxer->movi_start,(int)demuxer->movi_end); if(demuxer->stream->end_pos>demuxer->movi_end) demuxer->movi_end=demuxer->stream->end_pos; if(index_mode==-2 || index_mode==2 || index_mode==0) break; // reading from non-seekable source (stdin) or forced index or no index forced if(list_end>0) stream_seek(demuxer->stream,list_end); // skip movi list_end=0; } continue; } size2=stream_read_dword_le(demuxer->stream); mp_msg(MSGT_HEADER,MSGL_DBG2,"CHUNK %.4s len=%u\n",(char *) &id,size2); chunksize=(size2+1)&(~1); switch(id){ // Indicates where the subject of the file is archived case mmioFOURCC('I','A','R','L'): hdr="Archival Location";break; // Lists the artist of the original subject of the file; // for example, "Michaelangelo." case mmioFOURCC('I','A','R','T'): hdr="Artist";break; // Lists the name of the person or organization that commissioned // the subject of the file; for example "Pope Julian II." case mmioFOURCC('I','C','M','S'): hdr="Commissioned";break; // Provides general comments about the file or the subject // of the file. If the comment is several sentences long, end each // sentence with a period. Do not include new-line characters. case mmioFOURCC('I','C','M','T'): hdr="Comments";break; // Records the copyright information for the file; for example, // "Copyright Encyclopedia International 1991." If there are multiple // copyrights, separate them by semicolon followed by a space. case mmioFOURCC('I','C','O','P'): hdr="Copyright";break; // Describes whether an image has been cropped and, if so, how it // was cropped; for example, "lower-right corner." case mmioFOURCC('I','C','R','D'): hdr="Creation Date";break; // Describes whether an image has been cropped and, if so, how it // was cropped; for example, "lower-right corner." case mmioFOURCC('I','C','R','P'): hdr="Cropped";break; // Specifies the size of the original subject of the file; for // example, "8.5 in h, 11 in w." case mmioFOURCC('I','D','I','M'): hdr="Dimensions";break; // Stores dots per inch setting of the digitizer used to // produce the file, such as "300." case mmioFOURCC('I','D','P','I'): hdr="Dots Per Inch";break; // Stores the of the engineer who worked on the file. If there are // multiple engineers, separate the names by a semicolon and a blank; // for example, "Smith, John; Adams, Joe." case mmioFOURCC('I','E','N','G'): hdr="Engineer";break; // Describes the original work, such as "landscape,", "portrait," // "still liefe," etc. case mmioFOURCC('I','G','N','R'): hdr="Genre";break; // Provides a list of keywords that refer to the file or subject of the // file. Separate multiple keywords with a semicolon and a blank; // for example, "Seattle, aerial view; scenery." case mmioFOURCC('I','K','E','Y'): hdr="Keywords";break; // ILGT - Describes the changes in the lightness settings on the digitizer // required to produce the file. Note that the format of this information // depends on the hardware used. case mmioFOURCC('I','L','G','T'): hdr="Lightness";break; // IMED - Decribes the original subject of the file, such as // "computer image," "drawing," "lithograph," and so on. case mmioFOURCC('I','M','E','D'): hdr="Medium";break; // INAM - Stores the title of the subject of the file, such as // "Seattle from Above." case mmioFOURCC('I','N','A','M'): hdr="Name";break; // IPLT - Specifies the number of colors requested when digitizing // an image, such as "256." case mmioFOURCC('I','P','L','T'): hdr="Palette Setting";break; // IPRD - Specifies the name of title the file was originally intended // for, such as "Encyclopedia of Pacific Northwest Geography." case mmioFOURCC('I','P','R','D'): hdr="Product";break; // ISBJ - Decsribes the contents of the file, such as // "Aerial view of Seattle." case mmioFOURCC('I','S','B','J'): hdr="Subject";break; // ISFT - Identifies the name of the software packages used to create the // file, such as "Microsoft WaveEdit" case mmioFOURCC('I','S','F','T'): hdr="Software";break; // ISHP - Identifies the change in sharpness for the digitizer // required to produce the file (the format depends on the hardware used). case mmioFOURCC('I','S','H','P'): hdr="Sharpness";break; // ISRC - Identifies the name of the person or organization who // suplied the original subject of the file; for example, "Try Research." case mmioFOURCC('I','S','R','C'): hdr="Source";break; // ISRF - Identifies the original form of the material that was digitized, // such as "slide," "paper," "map," and so on. This is not necessarily // the same as IMED case mmioFOURCC('I','S','R','F'): hdr="Source Form";break; // ITCH - Identifies the technician who digitized the subject file; // for example, "Smith, John." case mmioFOURCC('I','T','C','H'): hdr="Technician";break; case mmioFOURCC('I','S','M','P'): hdr="Time Code";break; case mmioFOURCC('I','D','I','T'): hdr="Digitization Time";break; case ckidAVIMAINHDR: // read 'avih' stream_read(demuxer->stream,(char*) &avih,MIN(size2,sizeof(avih))); le2me_MainAVIHeader(&avih); // swap to machine endian chunksize-=MIN(size2,sizeof(avih)); if( mp_msg_test(MSGT_HEADER,MSGL_V) ) print_avih(&avih,MSGL_V); // else print_avih_flags(&avih,MSGL_V); break; case ckidSTREAMHEADER: { // read 'strh' AVIStreamHeader h; stream_read(demuxer->stream,(char*) &h,MIN(size2,sizeof(h))); le2me_AVIStreamHeader(&h); // swap to machine endian chunksize-=MIN(size2,sizeof(h)); ++stream_id; if(h.fccType==streamtypeVIDEO){ sh_video=new_sh_video(demuxer,stream_id); memcpy(&sh_video->video,&h,sizeof(h)); } else if(h.fccType==streamtypeAUDIO){ sh_audio=new_sh_audio(demuxer,stream_id); memcpy(&sh_audio->audio,&h,sizeof(h)); } last_fccType=h.fccType; if( mp_msg_test(MSGT_HEADER,MSGL_V) ) print_strh(&h,MSGL_V); break; } case mmioFOURCC('i', 'n', 'd', 'x'): { uint32_t i; avisuperindex_chunk *s; if(chunksize<=24){ break; } priv->suidx_size++; priv->suidx = realloc_struct(priv->suidx, priv->suidx_size, sizeof (avisuperindex_chunk)); s = &priv->suidx[priv->suidx_size-1]; chunksize-=24; memcpy(s->fcc, "indx", 4); s->dwSize = size2; s->wLongsPerEntry = stream_read_word_le(demuxer->stream); s->bIndexSubType = stream_read_char(demuxer->stream); s->bIndexType = stream_read_char(demuxer->stream); s->nEntriesInUse = stream_read_dword_le(demuxer->stream); *(uint32_t *)s->dwChunkId = stream_read_dword_le(demuxer->stream); stream_read(demuxer->stream, (char *)s->dwReserved, 3*4); memset(s->dwReserved, 0, 3*4); print_avisuperindex_chunk(s,MSGL_V); if( ((chunksize/4)/s->wLongsPerEntry) < s->nEntriesInUse){ mp_msg (MSGT_HEADER, MSGL_WARN, "Broken super index chunk\n"); s->nEntriesInUse = (chunksize/4)/s->wLongsPerEntry; } // Check and fix this useless crap if(s->wLongsPerEntry != sizeof (avisuperindex_entry)/4) { mp_msg (MSGT_HEADER, MSGL_WARN, "Broken super index chunk size: %u\n",s->wLongsPerEntry); s->wLongsPerEntry = sizeof(avisuperindex_entry)/4; } s->aIndex = calloc(s->nEntriesInUse, sizeof (avisuperindex_entry)); s->stdidx = calloc(s->nEntriesInUse, sizeof (avistdindex_chunk)); // now the real index of indices for (i=0; i<s->nEntriesInUse; i++) { chunksize-=16; s->aIndex[i].qwOffset = stream_read_dword_le(demuxer->stream) & 0xffffffff; s->aIndex[i].qwOffset |= ((uint64_t)stream_read_dword_le(demuxer->stream) & 0xffffffff)<<32; s->aIndex[i].dwSize = stream_read_dword_le(demuxer->stream); s->aIndex[i].dwDuration = stream_read_dword_le(demuxer->stream); mp_msg (MSGT_HEADER, MSGL_V, "ODML (%.4s): [%d] 0x%016"PRIx64" 0x%04x %u\n", (s->dwChunkId), i, (uint64_t)s->aIndex[i].qwOffset, s->aIndex[i].dwSize, s->aIndex[i].dwDuration); } break; } case ckidSTREAMFORMAT: { // read 'strf' if(last_fccType==streamtypeVIDEO){ sh_video->bih=calloc((chunksize<sizeof(BITMAPINFOHEADER))?sizeof(BITMAPINFOHEADER):chunksize,1);// sh_video->bih=malloc(chunksize); memset(sh_video->bih,0,chunksize); mp_msg(MSGT_HEADER,MSGL_V,MSGTR_MPDEMUX_AVIHDR_FoundBitmapInfoHeader,chunksize,sizeof(BITMAPINFOHEADER)); stream_read(demuxer->stream,(char*) sh_video->bih,chunksize); le2me_BITMAPINFOHEADER(sh_video->bih); // swap to machine endian // fixup MS-RLE header (seems to be broken for <256 color files) if(sh_video->bih->biCompression<=1 && sh_video->bih->biSize==40) sh_video->bih->biSize=chunksize; if( mp_msg_test(MSGT_HEADER,MSGL_V) ) print_video_header(sh_video->bih,MSGL_V); chunksize=0;// sh_video->fps=(float)sh_video->video.dwRate/(float)sh_video->video.dwScale;// sh_video->frametime=(float)sh_video->video.dwScale/(float)sh_video->video.dwRate;// if(demuxer->video->id==-1) demuxer->video->id=stream_id; // IdxFix: idxfix_videostream=stream_id; switch(sh_video->bih->biCompression){ case mmioFOURCC('M', 'P', 'G', '4'): case mmioFOURCC('m', 'p', 'g', '4'): case mmioFOURCC('D', 'I', 'V', '1'): idxfix_divx=3; // set index recovery mpeg4 flavour: msmpeg4v1 mp_msg(MSGT_HEADER,MSGL_V,MSGTR_MPDEMUX_AVIHDR_RegeneratingKeyfTableForMPG4V1); break; case mmioFOURCC('D', 'I', 'V', '3'): case mmioFOURCC('d', 'i', 'v', '3'): case mmioFOURCC('D', 'I', 'V', '4'): case mmioFOURCC('d', 'i', 'v', '4'): case mmioFOURCC('D', 'I', 'V', '5'): case mmioFOURCC('d', 'i', 'v', '5'): case mmioFOURCC('D', 'I', 'V', '6'): case mmioFOURCC('d', 'i', 'v', '6'): case mmioFOURCC('M', 'P', '4', '3'): case mmioFOURCC('m', 'p', '4', '3'): case mmioFOURCC('M', 'P', '4', '2'): case mmioFOURCC('m', 'p', '4', '2'): case mmioFOURCC('D', 'I', 'V', '2'): case mmioFOURCC('A', 'P', '4', '1'): idxfix_divx=1; // set index recovery mpeg4 flavour: msmpeg4v3 mp_msg(MSGT_HEADER,MSGL_V,MSGTR_MPDEMUX_AVIHDR_RegeneratingKeyfTableForDIVX3); break; case mmioFOURCC('D', 'I', 'V', 'X'): case mmioFOURCC('d', 'i', 'v', 'x'): case mmioFOURCC('D', 'X', '5', '0'): case mmioFOURCC('X', 'V', 'I', 'D'): case mmioFOURCC('x', 'v', 'i', 'd'): case mmioFOURCC('F', 'M', 'P', '4'): case mmioFOURCC('f', 'm', 'p', '4'): idxfix_divx=2; // set index recovery mpeg4 flavour: generic mpeg4 mp_msg(MSGT_HEADER,MSGL_V,MSGTR_MPDEMUX_AVIHDR_RegeneratingKeyfTableForMPEG4); break; } } else if(last_fccType==streamtypeAUDIO){ unsigned wf_size = chunksize<sizeof(WAVEFORMATEX)?sizeof(WAVEFORMATEX):chunksize; sh_audio->wf=calloc(wf_size,1);// sh_audio->wf=malloc(chunksize); memset(sh_audio->wf,0,chunksize); mp_msg(MSGT_HEADER,MSGL_V,MSGTR_MPDEMUX_AVIHDR_FoundWaveFmt,chunksize,sizeof(WAVEFORMATEX)); stream_read(demuxer->stream,(char*) sh_audio->wf,chunksize); le2me_WAVEFORMATEX(sh_audio->wf); if (sh_audio->wf->cbSize != 0 && wf_size < sizeof(WAVEFORMATEX)+sh_audio->wf->cbSize) { sh_audio->wf=realloc(sh_audio->wf, sizeof(WAVEFORMATEX)+sh_audio->wf->cbSize); } chunksize=0; if( mp_msg_test(MSGT_HEADER,MSGL_V) ) print_wave_header(sh_audio->wf,MSGL_V); ++priv->audio_streams;// if(demuxer->audio->id==-1) demuxer->audio->id=stream_id; } break; } case mmioFOURCC('v', 'p', 'r', 'p'): { VideoPropHeader *vprp = malloc(chunksize); unsigned int i; stream_read(demuxer->stream, (void*)vprp, chunksize); le2me_VideoPropHeader(vprp); chunksize -= sizeof(*vprp)-sizeof(vprp->FieldInfo); chunksize /= sizeof(VIDEO_FIELD_DESC); if (vprp->nbFieldPerFrame > chunksize) { vprp->nbFieldPerFrame = chunksize; } chunksize = 0; for (i=0; i<vprp->nbFieldPerFrame; i++) { le2me_VIDEO_FIELD_DESC(&vprp->FieldInfo[i]); } if (sh_video) { sh_video->aspect = GET_AVI_ASPECT(vprp->dwFrameAspectRatio); } if( mp_msg_test(MSGT_HEADER,MSGL_V) ) print_vprp(vprp,MSGL_V); free(vprp); break; } case mmioFOURCC('d', 'm', 'l', 'h'): { // dmlh 00 00 00 04 frms unsigned int total_frames = stream_read_dword_le(demuxer->stream); mp_msg(MSGT_HEADER,MSGL_V,MSGTR_MPDEMUX_AVIHDR_FoundAVIV2Header, chunksize, total_frames); stream_skip(demuxer->stream, chunksize-4); chunksize = 0; } break; case ckidAVINEWINDEX: if(demuxer->movi_end>stream_tell(demuxer->stream)) demuxer->movi_end=stream_tell(demuxer->stream); // fixup movi-end if(index_mode && !priv->isodml){ int i; priv->idx_size=size2>>4; mp_msg(MSGT_HEADER,MSGL_V,MSGTR_MPDEMUX_AVIHDR_ReadingIndexBlockChunksForFrames, priv->idx_size,avih.dwTotalFrames, (int64_t)stream_tell(demuxer->stream)); priv->idx=malloc(priv->idx_size<<4);// printf("\nindex to %p !!!!! (priv=%p)\n",priv->idx,priv); stream_read(demuxer->stream,(char*)priv->idx,priv->idx_size<<4); for (i = 0; i < priv->idx_size; i++) { // swap index to machine endian AVIINDEXENTRY *entry=(AVIINDEXENTRY*)priv->idx + i; le2me_AVIINDEXENTRY(entry); /* * We (ab)use the upper word for bits 32-47 of the offset, so * we'll clear them here. * FIXME: AFAIK no codec uses them, but if one does it will break */ entry->dwFlags&=0xffff; } chunksize-=priv->idx_size<<4; if( mp_msg_test(MSGT_HEADER,MSGL_DBG2) ) print_index(priv->idx,priv->idx_size,MSGL_DBG2); } break; /* added May 2002 */ case mmioFOURCC('R','I','F','F'): { char riff_type[4]; mp_msg(MSGT_HEADER, MSGL_V, MSGTR_MPDEMUX_AVIHDR_AdditionalRIFFHdr); stream_read(demuxer->stream, riff_type, sizeof riff_type); if (strncmp(riff_type, "AVIX", sizeof riff_type)) mp_msg(MSGT_HEADER, MSGL_WARN, MSGTR_MPDEMUX_AVIHDR_WarnNotExtendedAVIHdr); else { /* * We got an extended AVI header, so we need to switch to * ODML to get seeking to work, provided we got indx chunks * in the header (suidx_size > 0). */ if (priv->suidx_size > 0) priv->isodml = 1; } chunksize = 0; list_end = 0; /* a new list will follow */ break; } case ckidAVIPADDING: stream_skip(demuxer->stream, chunksize); chunksize = 0; break; } if(hdr){ mp_msg(MSGT_HEADER,MSGL_V,"hdr=%s size=%u\n",hdr,size2); if(size2==3) chunksize=1; // empty else { char buf[256]; int len=(size2<250)?size2:250; stream_read(demuxer->stream,buf,len); chunksize-=len; buf[len]=0; mp_msg(MSGT_HEADER,MSGL_V,"%-10s: %s\n",hdr,buf); demux_info_add(demuxer, hdr, buf); } } mp_msg(MSGT_HEADER,MSGL_DBG2,"list_end=0x%"PRIX64" pos=0x%"PRIX64" chunksize=0x%"PRIX64" next=0x%"PRIX64"\n", (int64_t)list_end, (int64_t)stream_tell(demuxer->stream), (int64_t)chunksize, (int64_t)chunksize+(int64_t)stream_tell(demuxer->stream)); if(list_end>0 && chunksize+stream_tell(demuxer->stream) == list_end) list_end=0; if(list_end>0 && chunksize+stream_tell(demuxer->stream)>list_end){ mp_msg(MSGT_HEADER,MSGL_V,MSGTR_MPDEMUX_AVIHDR_BrokenChunk,chunksize,(char *) &id); stream_seek(demuxer->stream,list_end); list_end=0; } else if(chunksize>0) stream_skip(demuxer->stream,chunksize); else if((int)chunksize<0) mp_msg(MSGT_HEADER,MSGL_WARN,"chunksize=%u (id=%.4s)\n",chunksize,(char *) &id);}if (priv->suidx_size > 0 && priv->idx_size == 0) { /* * No NEWAVIINDEX, but we got an OpenDML index. */ priv->isodml = 1;}if (priv->isodml && (index_mode==-1 || index_mode==0 || index_mode==1)) { int i, j, k; avisuperindex_chunk *cx; AVIINDEXENTRY *idx; if (priv->idx_size) free(priv->idx); priv->idx_size = 0; priv->idx_offset = 0; priv->idx = NULL; mp_msg(MSGT_HEADER, MSGL_INFO, MSGTR_MPDEMUX_AVIHDR_BuildingODMLidx, priv->suidx_size); // read the standard indices for (cx = &priv->suidx[0], i=0; i<priv->suidx_size; cx++, i++) { stream_reset(demuxer->stream); for (j=0; j<cx->nEntriesInUse; j++) { int ret1, ret2; memset(&cx->stdidx[j], 0, 32); ret1 = stream_seek(demuxer->stream, (off_t)cx->aIndex[j].qwOffset); ret2 = stream_read(demuxer->stream, (char *)&cx->stdidx[j], 32); if (ret1 != 1 || ret2 != 32 || cx->stdidx[j].nEntriesInUse==0) { // this is a broken file (probably incomplete) let the standard // gen_index routine handle this priv->isodml = 0; priv->idx_size = 0; mp_msg(MSGT_HEADER, MSGL_WARN, MSGTR_MPDEMUX_AVIHDR_BrokenODMLfile); goto freeout; } le2me_AVISTDIDXCHUNK(&cx->stdidx[j]); print_avistdindex_chunk(&cx->stdidx[j],MSGL_V); priv->idx_size += cx->stdidx[j].nEntriesInUse; cx->stdidx[j].aIndex = malloc(cx->stdidx[j].nEntriesInUse*sizeof(avistdindex_entry)); stream_read(demuxer->stream, (char *)cx->stdidx[j].aIndex, cx->stdidx[j].nEntriesInUse*sizeof(avistdindex_entry)); for (k=0;k<cx->stdidx[j].nEntriesInUse; k++) le2me_AVISTDIDXENTRY(&cx->stdidx[j].aIndex[k]); cx->stdidx[j].dwReserved3 = 0; } } /* * We convert the index by translating all entries into AVIINDEXENTRYs * and sorting them by offset. The result should be the same index * we would get with -forceidx. */ idx = priv->idx = malloc(priv->idx_size * sizeof (AVIINDEXENTRY)); for (cx = priv->suidx; cx != &priv->suidx[priv->suidx_size]; cx++) { avistdindex_chunk *sic; for (sic = cx->stdidx; sic != &cx->stdidx[cx->nEntriesInUse]; sic++) { avistdindex_entry *sie; for (sie = sic->aIndex; sie != &sic->aIndex[sic->nEntriesInUse]; sie++) { uint64_t off = sic->qwBaseOffset + sie->dwOffset - 8; memcpy(&idx->ckid, sic->dwChunkId, 4); idx->dwChunkOffset = off; idx->dwFlags = (off >> 32) << 16; idx->dwChunkLength = sie->dwSize & 0x7fffffff; idx->dwFlags |= (sie->dwSize&0x80000000)?0x0:AVIIF_KEYFRAME; // bit 31 denotes !keyframe idx++; } } } qsort(priv->idx, priv->idx_size, sizeof(AVIINDEXENTRY), avi_idx_cmp); /* Hack to work around a "wrong" index in some divx odml files (processor_burning.avi as an example) They have ##dc on non keyframes but the ix00 tells us they are ##db. Read the fcc of a non-keyframe vid frame and check it. */ { uint32_t id; uint32_t db = 0; stream_reset (demuxer->stream); // find out the video stream id. I have seen files with 01db. for (idx = &((AVIINDEXENTRY *)priv->idx)[0], i=0; i<priv->idx_size; i++, idx++){ unsigned char res[2]; if (odml_get_vstream_id(idx->ckid, res)) { db = mmioFOURCC(res[0], res[1], 'd', 'b'); break; } } // find first non keyframe for (idx = &((AVIINDEXENTRY *)priv->idx)[0], i=0; i<priv->idx_size; i++, idx++){ if (!(idx->dwFlags & AVIIF_KEYFRAME) && idx->ckid == db) break; } if (i<priv->idx_size && db) { stream_seek(demuxer->stream, AVI_IDX_OFFSET(idx)); id = stream_read_dword_le(demuxer->stream); if (id && id != db) // index fcc and real fcc differ? fix it. for (idx = &((AVIINDEXENTRY *)priv->idx)[0], i=0; i<priv->idx_size; i++, idx++){ if (!(idx->dwFlags & AVIIF_KEYFRAME) && idx->ckid == db) idx->ckid = id; } } } if ( mp_msg_test(MSGT_HEADER,MSGL_DBG2) ) print_index(priv->idx, priv->idx_size,MSGL_DBG2); demuxer->movi_end=demuxer->stream->end_pos;freeout: // free unneeded stuff cx = &priv->suidx[0]; do { for (j=0;j<cx->nEntriesInUse;j++) if (cx->stdidx[j].nEntriesInUse) free(cx->stdidx[j].aIndex); free(cx->stdidx); } while (cx++ != &priv->suidx[priv->suidx_size-1]); free(priv->suidx);}/* Read a saved index file */if (index_file_load) { FILE *fp; char magic[7]; unsigned int i; if ((fp = fopen(index_file_load, "r")) == NULL) { mp_msg(MSGT_HEADER,MSGL_ERR, MSGTR_MPDEMUX_AVIHDR_CantReadIdxFile, index_file_load, strerror(errno)); goto gen_index; } fread(&magic, 6, 1, fp); if (strncmp(magic, "MPIDX1", 6)) { mp_msg(MSGT_HEADER,MSGL_ERR, MSGTR_MPDEMUX_AVIHDR_NotValidMPidxFile, index_file_load); goto gen_index; } fread(&priv->idx_size, sizeof(priv->idx_size), 1, fp); priv->idx=malloc(priv->idx_size*sizeof(AVIINDEXENTRY)); if (!priv->idx) { mp_msg(MSGT_HEADER,MSGL_ERR, MSGTR_MPDEMUX_AVIHDR_FailedMallocForIdxFile, index_file_load); priv->idx_size = 0; goto gen_index; } for (i=0; i<priv->idx_size;i++) { AVIINDEXENTRY *idx; idx=&((AVIINDEXENTRY *)priv->idx)[i]; fread(idx, sizeof(AVIINDEXENTRY), 1, fp); if (feof(fp)) { mp_msg(MSGT_HEADER,MSGL_ERR, MSGTR_MPDEMUX_AVIHDR_PrematureEOF, index_file_load); free(priv->idx); priv->idx_size = 0; goto gen_index; } } fclose(fp); mp_msg(MSGT_HEADER,MSGL_INFO, MSGTR_MPDEMUX_AVIHDR_IdxFileLoaded, index_file_load);}gen_index:if(index_mode>=2 || (priv->idx_size==0 && index_mode==1)){ // build index for file: stream_reset(demuxer->stream); stream_seek(demuxer->stream,demuxer->movi_start); priv->idx_pos=0; priv->idx_size=0; priv->idx=NULL; while(1){ int id; unsigned len; off_t skip; AVIINDEXENTRY* idx; unsigned int c; demuxer->filepos=stream_tell(demuxer->stream); if(demuxer->filepos>=demuxer->movi_end && demuxer->movi_start<demuxer->movi_end) break; id=stream_read_dword_le(demuxer->stream); len=stream_read_dword_le(demuxer->stream); if(id==mmioFOURCC('L','I','S','T') || id==mmioFOURCC('R', 'I', 'F', 'F')){ id=stream_read_dword_le(demuxer->stream); // list or RIFF type continue; } if(stream_eof(demuxer->stream)) break; if(!id || avi_stream_id(id)==100) goto skip_chunk; // bad ID (or padding?) if(priv->idx_pos>=priv->idx_size){// priv->idx_size+=32; priv->idx_size+=1024; // +16kB priv->idx=realloc(priv->idx,priv->idx_size*sizeof(AVIINDEXENTRY)); if(!priv->idx){priv->idx_pos=0; break;} // error! } idx=&((AVIINDEXENTRY *)priv->idx)[priv->idx_pos++]; idx->ckid=id; idx->dwFlags=AVIIF_KEYFRAME; // FIXME idx->dwFlags|=(demuxer->filepos>>16)&0xffff0000U; idx->dwChunkOffset=(unsigned long)demuxer->filepos; idx->dwChunkLength=len; c=stream_read_dword(demuxer->stream); if(!len) idx->dwFlags&=~AVIIF_KEYFRAME; // Fix keyframes for DivX files: if(idxfix_divx) if(avi_stream_id(id)==idxfix_videostream){ switch(idxfix_divx){ case 3: c=stream_read_dword(demuxer->stream)<<5; //skip 32+5 bits for m$mpeg4v1 case 1: if(c&0x40000000) idx->dwFlags&=~AVIIF_KEYFRAME;break; // divx 3 case 2: if(c==0x1B6) idx->dwFlags&=~AVIIF_KEYFRAME;break; // divx 4 } } // update status line: { static off_t lastpos; off_t pos; off_t len=demuxer->movi_end-demuxer->movi_start; if(len){ pos=100*(demuxer->filepos-demuxer->movi_start)/len; // % } else { pos=(demuxer->filepos-demuxer->movi_start)>>20; // MB } if(pos!=lastpos){ lastpos=pos; mp_msg(MSGT_HEADER,MSGL_STATUS,MSGTR_MPDEMUX_AVIHDR_GeneratingIdx, (unsigned long)pos, len?"%":"MB"); } } mp_dbg(MSGT_HEADER,MSGL_DBG2,"%08X %08X %.4s %08X %X\n",(unsigned int)demuxer->filepos,id,(char *) &id,(int)c,(unsigned int) idx->dwFlags);#if 0 { unsigned char tmp[64]; int i; stream_read(demuxer->stream,tmp,64); printf("%.4s",&id); for(i=0;i<64;i++) printf(" %02X",tmp[i]); printf("\n"); }#endifskip_chunk: skip=(len+1)&(~1UL); // total bytes in this chunk stream_seek(demuxer->stream,8+demuxer->filepos+skip); } priv->idx_size=priv->idx_pos; mp_msg(MSGT_HEADER,MSGL_INFO,MSGTR_MPDEMUX_AVIHDR_IdxGeneratedForHowManyChunks,priv->idx_size); if( mp_msg_test(MSGT_HEADER,MSGL_DBG2) ) print_index(priv->idx,priv->idx_size,MSGL_DBG2); /* Write generated index to a file */ if (index_file_save) { FILE *fp; unsigned int i; if ((fp=fopen(index_file_save, "w")) == NULL) { mp_msg(MSGT_HEADER,MSGL_ERR, MSGTR_MPDEMUX_AVIHDR_Failed2WriteIdxFile, index_file_save, strerror(errno)); return; } fwrite("MPIDX1", 6, 1, fp); fwrite(&priv->idx_size, sizeof(priv->idx_size), 1, fp); for (i=0; i<priv->idx_size; i++) { AVIINDEXENTRY *idx = &((AVIINDEXENTRY *)priv->idx)[i]; fwrite(idx, sizeof(AVIINDEXENTRY), 1, fp); } fclose(fp); mp_msg(MSGT_HEADER,MSGL_INFO, MSGTR_MPDEMUX_AVIHDR_IdxFileSaved, index_file_save); }}}#undef MIN