AVI File Format.pptVIP

AVI File Format Xiaoyong Peng RIFF Format Resource Interchange File Format. AVI,WAV,CDR files use RIFF. Structure: RIFF size File Type LIST size List Type Other List… Sub Chunks… Data… Sub Chunk ID size … Like Folder Like File FourCC Four Character Code Used to identify stream/pixel format or meta data tag. Examples: DIVX / H264 (codec type) V422 (pixel format) avih / idx1 (AVI tag) SubChunk ID: ##wb-Audio, ##dc-Video, ##tx-Text AVI Standard AVI Open DML AVI AVI RIFF LIST-hdrl avih LIST-strl (repeat) strh strf LIST-movi [LIST ‘rec ‘] ##dc ##wb [idx1] AVIMAINHEADER AVISTREAMHEADER BITMAPINFO / WAVEFORMATEX AVIOLDINDEX AVI Structure AVIMAINHEADER AVISTREAMHEADER BITMAPINFO WAVEFORMATEX AVIOLDINDEX Open DML AVI Improved 2 points Break file size limitation. Better index structure. The can either be a single index chunk, or a two tiered index, with a super index pointing to interleaved index segments in the ‘movi’ data. The index can include locations of the fields within a frame. The index has no restrictions to 4 GB file size. There is an index per data stream (if necessary). Odml-Index Location indx Follow stream format(strf) chunk. ix## Interleaved in movi list. Base Index // bIndexType codes // #define AVI_INDEX_OF_INDEXES 0x00 // when each entry in aIndex // array points to an index chunk #define AVI_INDEX_OF_CHUNKS 0x01 // when each entry in aIndex // array points to a chunk in the file #define AVI_INDEX_IS_DATA 0x80 // when each entry is aIndex is // really the data // bIndexSubtype codes for INDEX_OF_CHUNKS // #define AVI_INDEX_2FIELD 0x01 // when fields within frames // are also indexed Video Properties Header (vprp) Other IDs Timecode Discontinuity Table (Stream) ‘tcdl’ Timecode Stream ‘time