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# Audio Streams

`ogg://` PHP 4.3.0 and up (PECL)

- `ogg://soundfile.ogg`

- `ogg:///path/to/soundfile.ogg`

- `ogg://http://www.example.com/path/to/soundstream.ogg`

> This wrapper is not enabled by default: In order to use the `ogg://` wrapper you must install the OGG/Vorbis extension available from PECL.

Files opened for reading via the `ogg://` wrapper are treated as compressed audio encoded using the OGG/Vorbis codec. Similarly, files opened for writing or appending via the `ogg://` wrapper are writen as compressed audio data. stream_get_meta_data(), when used on an OGG/Vorbis file opened for reading will return various details about the stream including the `vendor` tag, any included `comments`, the number of `channels`, the sampling `rate`, and the encoding rate range described by: `bitrate_lower`, `bitrate_upper`, `bitrate_nominal`, and `bitrate_window`.

Tabelle N-11. Wrapper Summary

Attribute | Supported
--- | ---
Restricted by allow_url_fopen | No
Allows Reading | Yes
Allows Writing | Yes
Allows Appending | Yes
Allows Simultaneous Reading and Writing | No
Supports stat() | No
Supports unlink() | No
Supports rename() | No
Supports mkdir() | No
Supports rmdir() | No

Tabelle N-12. Context options

Name | Usage | Default | Mode
--- | --- | --- | ---
`pcm_mode` | PCM encoding to apply while reading, one of: `OGGVORBIS_PCM_U8`, `OGGVORBIS_PCM_S8`, `OGGVORBIS_PCM_U16_BE`, `OGGVORBIS_PCM_S16_BE`, `OGGVORBIS_PCM_U16_LE`, and `OGGVORBIS_PCM_S16_LE`. (8 vs 16 bit, signed or unsigned, big or little endian) | OGGVORBIS_PCM_S16_LE | Read
`rate` | Sampling rate of input data, expressed in Hz | 44100 | Write/Append
`bitrate` | When given as an integer, the fixed bitrate at which to encode. (16000 to 131072) When given as a float, the variable bitrate quality to use. (-1.0 to 1.0) | 128000 | Write/Append
`channels` | The number of audio channels to encode, typically 1 (Mono), or 2 (Stero). May range as high as 16. | 2 | Write/Append
`comments` | An array of string values to encode into the track header. |  | Write/Append

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