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opusfile
0.7
Stand-alone decoder library for .opus files.
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The metadata from an Ogg Opus stream. More...
#include <opusfile.h>
Data Fields | |
| char ** | user_comments |
| The array of comment string vectors. More... | |
| int * | comment_lengths |
| An array of the corresponding length of each vector, in bytes. More... | |
| int | comments |
| The total number of comment streams. More... | |
| char * | vendor |
| The null-terminated vendor string. More... | |
The metadata from an Ogg Opus stream.
This structure holds the in-stream metadata corresponding to the 'comment' header packet of an Ogg Opus stream. The comment header is meant to be used much like someone jotting a quick note on the label of a CD. It should be a short, to the point text note that can be more than a couple words, but not more than a short paragraph.
The metadata is stored as a series of (tag, value) pairs, in length-encoded string vectors, using the same format as Vorbis (without the final "framing bit"), Theora, and Speex, except for the packet header. The first occurrence of the '=' character delimits the tag and value. A particular tag may occur more than once, and order is significant. The character set encoding for the strings is always UTF-8, but the tag names are limited to ASCII, and treated as case-insensitive. See the Vorbis comment header specification for details.
In filling in this structure, libopusfile will null-terminate the user_comments strings for safety. However, the bitstream format itself treats them as 8-bit clean vectors, possibly containing NUL characters, so the comment_lengths array should be treated as their authoritative length.
This structure is binary and source-compatible with a vorbis_comment, and pointers to it may be freely cast to vorbis_comment pointers, and vice versa. It is provided as a separate type to avoid introducing a compile-time dependency on the libvorbis headers.
| char** OpusTags::user_comments |
The array of comment string vectors.
| int* OpusTags::comment_lengths |
An array of the corresponding length of each vector, in bytes.
| int OpusTags::comments |
The total number of comment streams.
| char* OpusTags::vendor |
The null-terminated vendor string.
This identifies the software used to encode the stream.
1.8.10
