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vorbis_encode_init

declared in "vorbis/libvorbisenc.h";

This is the primary function within libvorbisenc for setting up managed bitrate modes.

Before this function is called, the vorbis_info struct should be initialized by using vorbis_info_init() from the libvorbis API. After encoding, vorbis_info_clear should be called.

The max_bitrate, nominal_bitrate, and min_bitrate settings are used to set constraints for the encoded file. This function uses these settings to select the appropriate encoding mode and set it up.

extern int vorbis_encode_init(vorbis_info *vi, long channels, long rate, long max_bitrate, long nominal_bitrate, long min_bitrate);

Parameters

vi

File pointer to an initialized vorbis_info struct.

channels

The number of channels to be encoded.

rate

The sampling rate of the source audio.

max_bitrate

Desired maximum bitrate (limit). -1 indicates unset.

nominal_bitrate

Desired average, or central, bitrate. -1 indicates unset.

min_bitrate

Desired minimum bitrate. -1 indicates unset.

Return Values

0 for success

less than zero for failure:

• OV_EFAULT - Internal logic fault; indicates a bug or heap/stack corruption.
• OV_EINVAL - Invalid setup request, eg, out of range argument.
• OV_EIMPL - Unimplemented mode; unable to comply with bitrate request.