2a09d1a4
 liuqimichale
添加宜春 天水 宣化
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# Media Source Extensions Notes
A collection of findings experimenting with Media Source Extensions on
Chrome 36.
* Specifying an audio and video codec when creating a source buffer
but passing in an initialization segment with only a video track
results in a decode error
## ISO Base Media File Format (BMFF)
### Init Segment
A working initialization segment is outlined below. It may be possible
to trim this structure down further.
- `ftyp`
- `moov`
- `mvhd`
- `trak`
- `tkhd`
- `mdia`
- `mdhd`
- `hdlr`
- `minf`
- `mvex`
### Media Segment
The structure of a minimal media segment that actually encapsulates
movie data is outlined below:
- `moof`
- `mfhd`
- `traf`
- `tfhd`
- `tfdt`
- `trun` containing samples
- `mdat`
### Structure
sample: time {number}, data {array}
chunk: samples {array}
track: samples {array}
segment: moov {box}, mdats {array} | moof {box}, mdats {array}, data {array}
track
chunk
sample
movie fragment -> track fragment -> [samples]
### Sample Data Offsets
Movie-fragment Relative Addressing: all trun data offsets are relative
to the containing moof (?).
Without default-base-is-moof, the base data offset for each trun in
trafs after the first is the *end* of the previous traf.
#### iso5/DASH Style
moof
|- traf (default-base-is-moof)
| |- trun_0 <size of moof> + 0
| `- trun_1 <size of moof> + 100
`- traf (default-base-is-moof)
`- trun_2 <size of moof> + 300
mdat
|- samples_for_trun_0 (100 bytes)
|- samples_for_trun_1 (200 bytes)
`- samples_for_trun_2
#### Single Track Style
moof
`- traf
`- trun_0 <size of moof> + 0
mdat
`- samples_for_trun_0
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