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oggvorbis
PHP Manual

# Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

OGG/Vorbis supports PCM encodings in the following formats
Constant | Definition
--- | ---
`OGGVORBIS_PCM_U8` | Unsigned 8-bit PCM.
`OGGVORBIS_PCM_S8` | Signed 8-bit PCM.
`OGGVORBIS_PCM_U16_LE` | Unsigned 16-bit PCM. Little Endian byte order.
`OGGVORBIS_PCM_U16_BE` | Unsigned 16-bit PCM. Big Endian byte order.
`OGGVORBIS_PCM_S16_LE` | Signed 16-bit PCM. Little Endian byte order.
`OGGVORBIS_PCM_S16_BE` | Signed 16-bit PCM. Big Endian byte order.

Resource Types
Context options
oggvorbis
PHP Manual