oggvorbis
Introducción
The OGG/Vorbis file format, as defined by » https://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: » https://pecl.php.net/package/oggvorbis
Context 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, https://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.
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. |