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.
This extension requires PHP >= 4.3.0, » libogg >= 1.0, and » libvorbis >= 1.0.
Данное расширение не определяет никакие директивы конфигурации в php.ini.
Дополнительная информация, такая как новый версии, скачивание, исходные файлы, информация о разработчике и CHANGELOG, могут быть найдены здесь: » http://pecl.php.net/package/oggvorbis
| 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') |
Перечисленные ниже константы определены данным расширением и могут быть доступны только в том случае, если PHP был собран с поддержкой этого расширения или же в том случае, если данное расширение подгружается во время выполнения.
| 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. |