
This change constrains the use of sample state member variables to writeSampleData, finishWriteSampleData and resetWriteSampleData. Using them elsewhere gets increasingly confusing when considering features like lacing in full blocks. For example sampleBytesWritten cannot be used when calling commitSampleToOutput in this case because we need to write the sample data for multiple samples before we commit any of them. Issue: #3026 PiperOrigin-RevId: 284541942