diff --git a/readme/apv_isobmff.md b/readme/apv_isobmff.md index e892038..382a9e1 100644 --- a/readme/apv_isobmff.md +++ b/readme/apv_isobmff.md @@ -63,7 +63,7 @@ aligned(8) class APVDecoderConfigurationBox extends FullBox('apvC',version=0, fl } ~~~~ -## APV Decoder Configuration Record {#APVDecoderConfigurationRecord} +## APV Decoder Configuration Record {#APVDecoderConfigurationRecord} The APVDecoderConfigurationRecord contains the information for initial configuration of a decoder which consumes the samples references the sample entry type of apv1. The information in this record is extracted from frame_header() of the bitstream stored in the track containing this record. @@ -159,20 +159,7 @@ the full_range_flag field in the frame header of the frames whose value of the p ## APV Sample Description ### Format of sample -When APV coded bitstream is encapsulated in a track with APVSampleEntry, each sample shall contain a size of access unit and an access unit of APV coded data. - -~~~~ -aligned(8) class APVSample{ - unsigned int(32) au_length; - bit(au_length * 8) access_unit; -} -~~~~ - -+ au_length -> indicates the size of an access unit measured in bytes. The size does not include the length field itself. - -+ access_unit -> contains a single access unit. It includes both the 4-characters signature and the variable length encapsulated PBU streams. +When APV coded bitstream is encapsulated in a track with APVSampleEntry, each sample shall contain one and only one access unit of APV coded data. The format of sample shall be same as the raw_bitstream_access_unit, the length field of four bytes preceeding the access unit data, as defined in the section 12.1 of [APV codec specification](#apv-codec). ### Sync sample Every samples of APV bitstream shall be sync samples. @@ -203,12 +190,12 @@ tile_index for sub-samples based on tiles, this parameter indicates the tile ind # Sub-parameters for the MIME tyype 'codecs' parameter -When the 'codecs' parameter of a MIME type is used for a track containing APV bistream, as defined in IETF RFC 6381, the sub-parameters defined in this section is used. +When the 'codecs' parameter of a MIME type is used for a track containing APV bistream, as defined in IETF RFC 6381, the sub-parameters defined in this section is used. The 'codecs' parameter string for the APV bitstream is defined as follows: ~~~ -<4CC value of sample entry>...¡¦. +<4CC value of sample entry>..... ~~~ The keys are defined as 4CC values and the value used for each keys are defined in the table below. @@ -219,4 +206,10 @@ The keys are defined as 4CC values and the value used for each keys are defined |'apvl'| level | the largest value of the level_idc in APVDecoderConfigurationRecord | |'apvb'| band | the largest value of the band_idc in APVDecoderConfigurationRecord | -For example, codecs="apv1.apvf44.apvl210.apvb3" indicates the track is compliant to 'apv1' sample entry type and the largest value of the profile in APVDecoderConfigurationRecord of the track is 422-12 profile, the level is 7 and the band is 3. +For example, codecs="apv1.apvf44.apvl210.apvb3" indicates the track is compliant to 'apv1' sample entry type and the largest value of the profile in APVDecoderConfigurationRecord of the track is 422-12 profile, the level is 7 and the band is 3. + +# References + + ++ APV codec +> The IETF Internet-Draft of APV codec: https://datatracker.ietf.org/doc/html/draft-lim-apv. \ No newline at end of file