Manipulate audio data files.
audiotool -append [-offset=pos] target audiofiles...
audiotool -build [-encoding=codec] target audiofiles...
audiotool -chart [-silence=value] [-framing=msec] audiofiles...
audiotool -codecs
audiotool -info audiofile
audiotool -notation audiofile [``new-string'']
audiotool -play audiofiles...
audiotool -plugins
audiotool -soundcard [index]
audiotool -strip [-silence=value] [-framing=msec] audiofiles...
audiotool -trim [-silence=value] [-framing=msec] [-padding=frames] audiofiles...
audiotool -version
Audiotool is used to copy, manipulate, and examine the contents of audio files. These audio files may be raw headerless audio data or audio stored in common data files such as .wav or .au files. In the near future audiotool will also support packetized audio files such as .mp3 and .ogg.
-append
appends the content of other audio files into an existing audio file. The offset to save within the existing file may be specified. If nessisary the content of the specified files will be re-encoded in the codec of the file being appended to.
-build
Build a brand new audio file from scratch and then copy content from existing audio files into it. The encoding of the new audio file will either be based on the file extension, the audio file that is being copied into it, or by specifying the encoding format directly.
-chart
This is used to generate an energy chart profile of the audio file frame by frame. A * indicates solid audio content, a ^ indicates what might be a lead or trailer section of partial content, and a . indicates relative silence. Soon a autotrim option will be added to audiotool to remove silent frames.
-codecs
List all active codec objects. If you have plugins which are loaded that creates codec objects which match a built-in codec, the plugin will be selected first.
-info
The info command gives you basic information on the audio file, including what format it is stored as, what codec the audio data is encoded in, how much data is in the file, what the bit rate used is, etc.
-notation
Notation can be used to either set or display the annotation stored in audio files which support annotations, such as .au and .wav files.
-play
Plays the content of the audio file to the default system audio device (soundcard). Play is supported on w32 and posix systems that support oss audio. Future work will expand to additional platforms.
-plugins
This simply returns the path to the plugins directory. All plugins are loaded with Audio::init(). Plugins are not supported when building with static linkage.
-strip
Strips out all silent frames from an audio file. Silent frames are those which fall below a threashold and that have no peak impulse above the threashold.
-trim
Removes leading and trailing "silence" from a file. The -padding option may be used to add additional silent frames at the end of the file after it has been trimed, as this may be needed for files that will later be used to join together phrases.
At this time audiotool does not perform and ccaudio does not support sample rate conversion. Appending and building from files which are encoded at different sample rates could have ammusing results.
Written by David Sugar.
Report bugs to <[email protected]>.
Copyright © 2004 Open Source Telecom Corp.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.