The OGG/Vorbis file format, as defined by http://www.vorbis.com/
and 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.
Данное расширение не определяет никакие директивы конфигурации в php.ini.
oggvorbis is installed through the usual PECL package installation process.
Таблица 1. 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') |
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.
Таблица 2. 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. |
