Referencia de funciones
PHP Manual

oggvorbis

Introducción

The OGG/Vorbis file format, as defined by » http://www.vorbis.com/, is a scheme for compressing audio streams by multiple factors with a minimum of quality loss. This extension adds Ogg Vorbis support to PHP's URL Wrappers. When used in read mode, compressed OGG/Vorbis data is expanded to raw PCM audio in one of six PCM encoding formats listed below.

Requisitos

This extension requires PHP >= 4.3.0, » libogg >= 1.0, and » libvorbis >= 1.0.

Configuración en tiempo de ejecución

Esta extensión no tiene directivas de configuración en php.ini.

Instalación

Mas informacion sobre nuevos lanzamientos, descargas ficheros de fuentes, informacion sobre los responsables asi como un 'CHANGELOG', se puede encontrar aqui: » http://pecl.php.net/package/oggvorbis

Context options

OGG/Vorbis tuning options
Option Definition Relevance Default
pcm_mode PCM byte encoding used. See constants below. Read / Write OGGVORBIS_PCM_S16_LE
rate PCM Sampling rate. Measured in Hz. Write only 44100
bitrate Vorbis Average Bitrate Encoding / Variable Bitrate Encoding. Measured in bps (ABR) or Quality level (VBR: 0.0 to 1.0). 128000 ABR is rough equal to 0.4 VBR. Write only 128000
channels Number of PCM channels. 1 == Mono, 2 == Stereo. Write only 2
serialno Serial Number of stream within file. Must be unique within file. Because of the potential to select a duplicate serial number within a chained file, make efforts to manually assign unique numbers when encoding. Write only Random
comments Associative array of file comments. Will be translated to strtoupper($name) . "=$value". Note: This context option is not available in oggvorbis-0.1 Write only array('ENCODER' => 'PHP/OggVorbis, http://pear.php.net/oggvorbis')

Constantes predefinidas

Estas constantes están definidas por esta extensión y estarán disponibles solamente cuando la extensión ha sido o bien compilada dentro de PHP o grabada dinámicamente en tiempo de ejecución.

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.

Referencia de funciones
PHP Manual