oggvorbis
Introduktion
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.
Systemkrav
This extension requires PHP >= 4.3.0, » libogg >= 1.0, and » libvorbis >= 1.0.
Runtime Konfiguration
Denne udvidelse har intet konfigurations-direktiv defineret i php.ini.
Installation
Uddybende information så som nye udgivelser, downloads, kildekoder, vedligeholder information samt en CHANGELOG, kan findes her: » 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') |
Foruddefinerede Konstanter
Konstanterne nedenunder er defineret af denne udvidelse, og vil kun være tilgængelige når denne udvidelse enten er blevet kompileret ind i PHP eller dynamisk indsat under runtime.
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. |