Secure Shell 2
Note that although "ogg:" is the wrapper name, the stream is restricted to Ogg files containing a single stream encoded using the Vorbis audio codec. An Ogg container can, in fact, contain multiple streams: audio, video, anything. (Also, the audio streams in an Ogg contaner can use codecs such as FLAC and OggPCM.) The wrapper name is therefore misleading.
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.
Tabulka 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 |
add a note
User Contributed NotesAudio Streams
martin dot leese at stanfordalumni dot org
18-Feb-2008 10:04
18-Feb-2008 10:04