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Update README.md

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Jamie Hardt
2019-01-02 11:28:10 -08:00
parent f52b2a195a
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@@ -42,10 +42,8 @@ info = WavInfoReader(path)
### Basic WAV Data
The length of the file in frames (interleaved samples) and bytes is available, as is the contents of the format chunk.
```python
(info.data.frame_count, info.data.byte_count)
>>> (240239, 1441434)
@@ -53,9 +51,27 @@ The length of the file in frames (interleaved samples) and bytes is available, a
>>> (48000, 2, 6, 24)
```
## Broadcast WAV Extension
### Broadcast WAV Extension
A WAV file produced to Broadcast-WAV specifications will have the broadcast metadata extension,
which includes a 256-character free text descrption, creating entity identifier (usually the
recording application or equipment), the date and time of recording and a time reference for
timecode synchronization.
The `coding_history` is designed to contain a record of every conversion performed on the audio
file.
In this example (from a Sound Devices 702T) the bext metadata contains scene/take slating
information in the `description`. Here also the `originator_ref` is a serial number conforming
to EBU Rec 99.
If the bext metadata conforms to EBU 3285 v1, it will contain the WAV's 32 or 64 byte SMPTE
330M UMID. The 32-byte version of the UMID is usually just a random number, while the 64-byte
UMID will also have information on the recording date and time, recording equipment and entity,
and geolocation data.
If the bext metadata conforms to EBU 3285 v2, it will hold precomputed program loudness values
as described by EBU Rec 128.
```python
print(info.bext.description)
@@ -90,8 +106,17 @@ print(info.bext.coding_history)
## iXML Production Recorder Metadata
### iXML Production Recorder Metadata
iXML allows an XML document to be embedded in a WAV file.
The iXML website recommends a schema for recorder information but
there is no official DTD and vendors mostly do their own thing, apart from
hitting a few key xpaths. iXML is used by most location/production recorders
to save slating information, timecode and sync points in a reliable way.
iXML is also used to link "families" of WAV files together, so WAV files
recorded simultaneously or contiguously can be related by a receiving client.
```python
print("iXML Project:", info.ixml.project)
@@ -108,6 +133,13 @@ print("iXML File Family UID:", info.ixml.family_uid)
iXML Tape: 18Y12M31
iXML File Family Name: None
iXML File Family UID: USSDVGR1112089007124001008206300
### INFO Metadata
INFO Metadata is a standard method for saving tagged text data in a WAV or AVI
file.