Example Code

The following is a run-through of the decoding example program supplied with ch as a concert recording) is chopped into multiple separate files. Requesting to seek to a position before the beginning of such a file will seek to the position where audio begins.

As of vorbisfile version 1.68, seeking also optionally provides automatic crosslapping to eliminate clicks and other discontinuity artifacts at seeking boundaries. This fetaure is of particular interest to player and game developers implementing dynamic music and audio engines, or others looking for smooth transitions within a single sample or across multiple samples.

Naturally, seeking is available only within a seekable file or stream. Seeking functions will return OV_ENOSEEK on nonseekable files and streams.

function purpose

ov_raw_seek This function seeks to a position specified in the compressed bitstream, specified in bytes.

ov_pcm_seek This function seeks to a specific audio sample number, specified in pcm samples.

ov_pcm_seek_page This function seeks to the closest page preceding the specified audio sample number, specified in pcm samples.

ov_time_seek This function seeks to the specific time location in the bitstream, specified in seconds

ov_time_seek_page This function seeks to the closest page preceding the specified time position in the bitstream

ov_raw_seek_lap This function seeks to a position specified in the compressed bitstream, specified in bytes. The boundary between the old and new playback positions is crosslapped to eliminate discontinuities.

ov_pcm_seek_lap This function seeks to a specific audio sample number, specified in pcm samples. The boundary between the old and new playback positions is crosslapped to eliminate discontinuities.

ov_pcm_seek_page_lap This function seeks to the closest page preceding the specified audio sample number, specified in pcm samples. The boundary between the old and new playback positions is crosslapped to eliminate discontinuities.

ov_time_seek_lap This function seeks to the specific time location in the bitstream, specified in seconds. The boundary between the old and new playback positions is crosslapped to eliminate discontinuities.

ov_time_seek_page_lap This function seeks to the closest page preceding the specified time position in the bitstream. The boundary between the old and new playback positions is crosslapped to eliminate discontinuities.

copyright © 2007 Xiph.org	Ogg Vorbis
Vorbisfile documentation	vorbisfile version 1.2.0 - 20070723

./usr/share/doc/libvorbis-dev/html/vorbisfile/ov_pcm_seek_page.html0000644000000000000000000000470011473241260024425 0ustar rootroot Vorbisfile - function - ov_pcm_seek_page

function	purpose
ov_raw_seek	This function seeks to a position specified in the compressed bitstream, specified in bytes.
ov_pcm_seek	This function seeks to a specific audio sample number, specified in pcm samples.
ov_pcm_seek_page	This function seeks to the closest page preceding the specified audio sample number, specified in pcm samples.
ov_time_seek	This function seeks to the specific time location in the bitstream, specified in seconds
ov_time_seek_page	This function seeks to the closest page preceding the specified time position in the bitstream
ov_raw_seek_lap	This function seeks to a position specified in the compressed bitstream, specified in bytes. The boundary between the old and new playback positions is crosslapped to eliminate discontinuities.
ov_pcm_seek_lap	This function seeks to a specific audio sample number, specified in pcm samples. The boundary between the old and new playback positions is crosslapped to eliminate discontinuities.
ov_pcm_seek_page_lap	This function seeks to the closest page preceding the specified audio sample number, specified in pcm samples. The boundary between the old and new playback positions is crosslapped to eliminate discontinuities.
ov_time_seek_lap	This function seeks to the specific time location in the bitstream, specified in seconds. The boundary between the old and new playback positions is crosslapped to eliminate discontinuities.
ov_time_seek_page_lap	This function seeks to the closest page preceding the specified time position in the bitstream. The boundary between the old and new playback positions is crosslapped to eliminate discontinuities.