ao_open_file

declared in "ao/ao.h";

Open a file for audio output. The file format is determined by the audio driver used.

ao_device* ao_open_file(int driver_id, const char *filename, int overwrite, ao_sample_format *format, ao_option *options);

Parameters

driver_id

The ID number of the driver as returned by ao_driver_id().

filename

Name of the file in which to store the audio. The special filename "-" corresponds to stdout.

overwrite

If non-zero, the file is automatically overwritten. If zero, then a preexisting file will cause the function to report a failure.

format

Pointer to a struct describing the sample format. The caller retains ownership of this structure.

options

A linked list of options to be passed to the driver or NULL if no options are needed. Unsupported options are ignored.

Return Values

non-NULL pointer inicates success. This pointer must be passed in subsequent calls to ao_play() and ao_close().

NULL indicates failure. errno will contain the specific cause of the failure:

• AO_ENODRIVER - No driver corresponds to driver_id.
• AO_ENOTFILE - This driver is not a file output driver.
• AO_EBADOPTION - A valid option key has an invalid value.
• AO_EOPENFILE - Cannot open the file.
• AO_EFILEEXISTS - The file already exists. (Only if overwrite == 0)
• AO_EFAIL - Any other cause of failure.

Notes

Live output drivers cannot be used with this function. Use ao_open_live() instead. Some file formats (notably .WAV) cannot be correctly written to non-seekable files (like stdin).

When passed to ao_open_file(), the byte_format member of an ao_sample_format struct does not specify the byte format that will be used in the file output, just the input sample format.