Eyevinn / mp4ff
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22222926302

Pull #465

github

tobbee 
feat: add streaming/incremental processing for fragmented MP4 files.

Add Copy method for StypBox and FtypBox.

Implements support for processing fragmented MP4 files incrementally without
loading entire files into memory. This is essential for handling large media
files, live streaming scenarios, and network streams where fragments arrive
over time.

Key components:

1. StreamFile API (stream.go)
   - DecodeStream/InitDecodeStream: Reads init segment (ftyp, moov) and stops
   - ProcessFragments: Iteratively processes fragments with callbacks
   - Sliding window memory management with configurable retention
   - Fragment lifecycle callbacks for processing and cleanup control

2. BoxSeekReader (boxseekreader.go)
   - Emulates seeking on non-seekable streams using buffered reading
   - Auto-growing buffer sized for current needs
   - Peek operations for looking ahead without consuming data

3. SampleAccessor interface
   - GetSample: Fetch individual samples (1-based indexing)
   - GetSampleRange: Fetch ranges of samples efficiently
   - GetSamples: Fetch all samples for a track

Buffer management:
- ReadFullBox returns a slice view of the buffer (no copy for performance)
- Callers must use data immediately before next operation
- ResetBuffer() explicitly clears buffer after parsing is complete
- Buffer clearing happens after box parsing, not during ReadFullBox
- For mdat seeks, ResetBuffer() called after seek to avoid buffer corruption

Testing:
- Comprehensive test suite using external black-box testing (mp4_test package)
- Tests cover streaming, callbacks, sliding windows, retention, sample access
- All tests use public API only per project guidelines
Pull Request #465: Stream process support with example for on-the-fly MP4 encryption and refragmentation

806 of 962 new or added lines in 7 files covered. (83.78%)

18435 of 22280 relevant lines covered (82.74%)

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Builds Branch Commit Type Ran Committer Via Coverage
22222926302 stream-process feat: add streaming/incremental processing for fragmented MP4 files. Add Copy method for StypBox and FtypBox. Implements support for processing fragmented MP4 files incrementally without loading entire files into memory. This is essential for ha... Pull #465 tobbee github
82.74
22222839407 stream-process feat: add streaming/incremental processing for fragmented MP4 files. Add Copy method for StypBox and FtypBox. Implements support for processing fragmented MP4 files incrementally without loading entire files into memory. This is essential for ha... Pull #465 tobbee github
82.74
18874849030 stream-process feat: add streaming/incremental processing for fragmented MP4 files. Add Copy method for StypBox and FtypBox. Implements support for processing fragmented MP4 files incrementally without loading entire files into memory. This is essential for ha... Pull #465 tobbee github
81.6
18775892352 stream-process fix: Add trun.AddSampleDefaultValues before extracting samples, add input file option to stream-encrypt Pull #465 tobbee github
81.6
18225472042 stream-process better test coverage Pull #465 tobbee github
81.59
18224928217 stream-process docs: update CHANGELOG.md Pull #465 tobbee github
81.47
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