PDO_ODBC DSNCVIII. oggvorbis
Einführung
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.
Anforderungen
This extension requires PHP >= 4.3.0, » libogg >= 1.0, and » libvorbis >= 1.0.
Laufzeit Konfiguration
Diese Erweiterung definiert keine Konfigurationseinstellungen in der php.ini.
Installation
oggvorbis is installed through the usual PECL package installation process.
$ pear install oggvorbis- Copy the resulting oggvorbis.so to an appropriate location and add extension=oggvorbis.so to your php.ini file or load it dynamically in your PHP script using dl('oggvorbis.so');
Context options
Tabelle 190. 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') |
Vordefinierte Konstanten
Folgende Konstanten werden von dieser Erweiterung definiert und stehen nur zur Verfügung, wenn die Erweiterung entweder statisch in PHP kompiliert oder dynamisch zur Laufzeit geladen wurde.
Tabelle 191. 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. |
Inhaltsverzeichnis
- Usage — Examples on using the ogg:// wrapper.
add a note
User Contributed Notes
oggvorbis