vorbis_info

declared in "vorbis/codec.h"

The vorbis_info structure contains information about a vorbis bitstream. Most of the information in this struct is more complex and in-depth than we need when using basic API calls.

typedef struct vorbis_info{ int version; int channels; long rate; long bitrate_upper; long bitrate_nominal; long bitrate_lower; long blocksizes[2]; int modes; int maps; int times; int floors; int residues; int books; int psys; /* encode only */ vorbis_info_mode *mode_param[64]; int map_type[64]; vorbis_info_mapping *map_param[64]; int time_type[64]; vorbis_info_time *time_param[64]; int floor_type[64]; vorbis_info_floor *floor_param[64]; int residue_type[64]; vorbis_info_residue *residue_param[64]; static_codebook *book_param[256]; vorbis_info_psy *psy_param[64]; /* encode only */ /* for block long/sort tuning; encode only */ int envelopesa; double preecho_thresh; double preecho_clamp; } vorbis_info;

Relevant Struct Members

version

Vorbis encoder version used to create this bitstream.

channels

Int signifying number of channels in bitstream.

rate

Sampling rate of the bitstream.

bitrate_upper

Specifies the upper limit in a VBR bitstream. If the value matches the bitrate_nominal and bitrate_lower parameters, the stream is fixed bitrate. May be unset if no limit exists.

bitrate_nominal

Specifies the average bitrate for a VBR bitstream. May be unset. If the bitrate_upper and bitrate_lower parameters match, the stream is fixed bitrate.

bitrate_lower

Specifies the lower limit in a VBR bitstream. If the value matches the bitrate_nominal and bitrate_upper parameters, the stream is fixed bitrate. May be unset if no limit exists.

blocksizes[2]

Contains the sizes of the long and short blocks for this particular bitstream. These are variable and can be set by the encoder. Vorbis only supports two sizes, long and short.