NAME

Ogg::LibOgg - XS Code for Ogg bindings for Perl.

SYNOPSIS

use Ogg::LibOgg;
my $filename = "t/test.ogg";
open $fd, $filename or die "Can't open $filename: $!";
## Make Ogg Packet
my $op = Ogg::LibOgg::make_ogg_packet();
## Make Ogg Stream State
my $os = Ogg::LibOgg::make_ogg_stream_state();
## Make Ogg Page
my $og = Ogg::LibOgg::make_ogg_page();
## Make Ogg Sync State
my $oy = Ogg::LibOgg::make_ogg_sync_state();
## Ogg Sync Init
Ogg::LibOgg::ogg_sync_init($oy); # this should be == 0
## Ogg Read Page (this is a custom wrapper, please read the perldoc)
Ogg::LibOgg::ogg_read_page($fd, $oy, $og); # == 0, 
## Ogg Page Serial Number
my $slno = Ogg::LibOgg::ogg_page_serialno($og);
..etc..
close $fd;

DESCRIPTION

Ogg::LibOgg let you call the libogg functions directly and the glue is written in XS. Please read LibOgg.xs to understand the implementation.

EXPORT

None by default. Please use Ogg::LibOgg ':all' to export everything to the current namespace.

Functions (malloc)

Memory Allocation for the Ogg Structures

make_ogg_packet

Creates an Ogg Packet.

@Input: Void

@Output: Memory address of Ogg Packet.

make_ogg_stream_state

Creates an Ogg Stream State.

@Input: Void

@Output: Memory address of Ogg Stream State.

make_ogg_page

Creates an Ogg Page.

@Input: Void

@Output: Memory address of Ogg Page.

make_ogg_sync_state

Creates an Ogg Sync State.

@Input: Void

@Output: Memory address og Ogg Sync State.

Functions (Bitstream Primitives)

ogg_stream_init

This function is used to initialize an ogg_stream_state struct and allocates appropriate memory in preparation for encoding or decoding. (http://www.xiph.org/ogg/doc/libogg/ogg_stream_init.html)

@Input: ogg_stream_state (memory addr) serial number

@Output: 0 if successful -1 if unsuccessful

ogg_read_page

This function is a wrapper around ogg_sync_pageout. In an actual decoding loop, this function should be called first to ensure that the buffer is cleared. The example code below illustrates a clean reading loop which will fill and output pages.

ogg_sync_pageout takes the data stored in the buffer of the ogg_sync_state struct and inserts them into an ogg_page.

  if (ogg_sync_pageout(&oy, &og) != 1) {
	buffer = ogg_sync_buffer(&oy, 8192);
	bytes = fread(buffer, 1, 8192, stdin);
	ogg_sync_wrote(&oy, bytes);
  }

@Input: FILE * ogg_sync_state ogg_page

@Output: -1 buffer overflow or internal error (status of ogg_sync_wrote) 0 all other cases

ogg_page_bos

Indicates whether this page is at the beginning of the logical bitstream. (http://www.xiph.org/ogg/doc/libogg/ogg_page_bos.html)

@Input: ogg_page

@Output: > 0 if this page is the beginning of a bitstream. 0 if this page is from any other location in the stream.

ogg_page_eos

Indicates whether this page is at the end of the logical bitstream. (http://www.xiph.org/ogg/doc/libogg/ogg_page_eos.html)

@Input: ogg_page

@Output: > 0 if this page is the beginning of a bitstream. 0 if this page is from any other location in the stream.

ogg_page_checksum_set

Checksums an ogg_page. (http://www.xiph.org/ogg/doc/libogg/ogg_page_checksum_set.html)

(Not *SURE* why in the ogg official doc, they have given the function definition as 'int ogg_page_checksum_set(og)', it should be actuall 'void ogg_page_checksum_set(og)').

@Input: ogg_page

@Output: void

ogg_page_continued

Indicates whether this page contains packet data which has been continued from the previous page. (http://www.xiph.org/ogg/doc/libogg/ogg_page_continued.html)

@Input: ogg_page

@Output: int

ogg_page_granulepos

Returns the exact granular position of the packet data contained at the end of this page. (http://www.xiph.org/ogg/doc/libogg/ogg_page_granulepos.html)

@Input: ogg_page

@Output: n is the specific last granular position of the decoded data contained in the page.

ogg_page_packets

Returns the number of packets that are completed on this page.

(http://www.xiph.org/ogg/doc/libogg/ogg_page_packets.html)

@Input: ogg_page

@Output: 1 If a page consists of a packet begun on a previous page, != 0 a new packet begun (but not completed) on this page,

0 If a page happens to be a single packet that was begun on a previous page, 
!= 0 and spans to the next page

ogg_page_pageno

Returns the sequential page number. (http://www.xiph.org/ogg/doc/libogg/ogg_page_pageno.html)

@Input: ogg_page

@Output: n, is the page number for this page.

ogg_page_serialno

Returns the unique serial number for the logical bitstream of this page. Each page contains the serial number for the logical bitstream that it belongs to. (http://www.xiph.org/ogg/doc/libogg/ogg_page_serialno.html)

@Input: ogg_page

@Output: n, where n is the serial number for this page.

ogg_stream_clear

This function clears and frees the internal memory used by the ogg_stream_state struct, but does not free the structure itself. (http://www.xiph.org/ogg/doc/libogg/ogg_stream_clear.html)

@Input: ogg_stream_state

@Output: 0 is always returned

ogg_stream_reset

This function sets values in the ogg_stream_state struct back to initial values. (http://www.xiph.org/ogg/doc/libogg/ogg_stream_reset.html)

@Input: ogg_stream_state

@Output: 0, success != 0, internal error

ogg_stream_reset_serialno

Similar to ogg_stream_reset, but it also it sets the stream serial number to the given value. (http://www.xiph.org/ogg/doc/libogg/ogg_stream_reset_serialno.html)

@Input: ogg_stream_state serialno

@Output: 0, success != 0, internal error

ogg_stream_destroy

This function frees the internal memory used by the ogg_stream_state struct as well as the structure itself. (http://www.xiph.org/ogg/doc/libogg/ogg_stream_destroy.html)

@Input: ogg_stream_state

@Output: 0, always

ogg_stream_check

This function is used to check the error or readiness condition of an ogg_stream_state structure. (http://www.xiph.org/ogg/doc/libogg/ogg_stream_check.html)

@Input: ogg_stream_state

@Output: 0, if the ogg_stream_state structure is initialized and ready. != 0, never initialized, or if an unrecoverable internal error occurred

ogg_page_version

This function returns the version of ogg_page used in this page. (http://www.xiph.org/ogg/doc/libogg/ogg_page_version.html)

@Input: ogg_page

@Output: n, is the version number (for current ogg, 0 is always returned, else error)

ogg_packet_clear

his function clears the memory used by the ogg_packet struct, but does not free the structure itself. Don't call it directly. (http://www.xiph.org/ogg/doc/libogg/ogg_packet_clear.html)

@Input: ogg_packet

@Ouput: void

Functions (Encoding)

ogg_stream_packetin

This function submits a packet to the bitstream for page encapsulation. After this is called, more packets can be submitted, or pages can be written out. (http://www.xiph.org/ogg/doc/libogg/ogg_stream_packetin.html)

@Input: ogg_stream_state ogg_packet

@Output: 0, on success -1, on internal error

ogg_stream_pageout

This function forms packets into pages, this would be called after using ogg_stream_packetin(). (http://www.xiph.org/ogg/doc/libogg/ogg_stream_pageout.html)

@Input: ogg_stream_state ogg_page

@Output: 0, insufficient data or internal error != 0, page has been completed and returned.

ogg_stream_flush

This function checks for remaining packets inside the stream and forces remaining packets into a page, regardless of the size of the page. (http://www.xiph.org/ogg/doc/libogg/ogg_stream_flush.html)

@Input: ogg_stream_state ogg_page

@Output: 0, means that all packet data has already been flushed into pages != 0, means that remaining packets have successfully been flushed into the page.

Functions (Decoding)

ogg_sync_init

ogg sync init, This function is used to initialize an ogg_sync_state struct to a known initial value in preparation for manipulation of an Ogg bitstream. (http://www.xiph.org/ogg/doc/libogg/ogg_sync_init.html)

@Input: ogg_sync_state (memory addr)

@Output: 0 (always)

ogg_sync_clear

This function is used to free the internal storage of an ogg_sync_state struct and resets the struct to the initial state. (http://www.xiph.org/ogg/doc/libogg/ogg_sync_clear.html)

@Input: ogg_sync_state

@Output: 0, always

ogg_sync_reset

This function is used to reset the internal counters of the ogg_sync_state struct to initial values. (http://www.xiph.org/ogg/doc/libogg/ogg_sync_reset.html)

@Input: ogg_sync_state

@Output: 0, always

ogg_sync_destroy

This function is used to destroy an ogg_sync_state struct and free all memory used. (http://www.xiph.org/ogg/doc/libogg/ogg_sync_destroy.html)

@Input: ogg_sync_state

@Ouput: 0, always

ogg_sync_check

This function is used to check the error or readiness condition of an ogg_sync_state structure. (http://www.xiph.org/ogg/doc/libogg/ogg_sync_check.html)

@Input: ogg_sync_state

@Output: 0, is returned if the ogg_sync_state structure is initialized and ready. != 0, if the structure was never initialized, or if an unrecoverable internal error

ogg_sync_buffer

This function is used to provide a properly-sized buffer for writing. (http://www.xiph.org/ogg/doc/libogg/ogg_sync_buffer.html)

@Input: ogg_sync_state size

@Output: Returns a pointer to the newly allocated buffer or NULL on error

ogg_sync_wrote

This function is used to tell the ogg_sync_state struct how many bytes we wrote into the buffer. (http://www.xiph.org/ogg/doc/libogg/ogg_sync_wrote.html)

@Input: ogg_sync_state bytes

@Output: -1 if the number of bytes written overflows the internal storage of the ogg_sync_state struct or an internal error occurred. 0 in all other cases.

ogg_sync_pageseek

This function synchronizes the ogg_sync_state struct to the next ogg_page. (http://www.xiph.org/ogg/doc/libogg/ogg_sync_pageseek.html)

@Input: ogg_sync_state ogg_page

@Output: -n means that we skipped n bytes within the bitstream. 0 means that we need more data, or than an internal error occurred. n means that the page was synced at the current location, with a page length of n bytes.

ogg_sync_pageout

This function takes the data stored in the buffer of the ogg_sync_state struct and inserts them into an ogg_page. In an actual decoding loop, this function should be called first to ensure that the buffer is cleared. (http://www.xiph.org/ogg/doc/libogg/ogg_sync_pageout.html).

@Input: ogg_sync_state ogg_page

@Output: -1 returned if stream has not yet captured sync (bytes were skipped). 0 returned if more data needed or an internal error occurred. 1 indicated a page was synced and returned.

ogg_stream_pagein

This function adds a complete page to the bitstream. In a typical decoding situation, this function would be called after using ogg_sync_pageout to create a valid ogg_page struct. (http://www.xiph.org/ogg/doc/libogg/ogg_stream_pagein.html)

@Input: ogg_stream_state ogg_page

@Output: -1 indicates failure. 0 means that the page was successfully submitted to the bitstream.

ogg_stream_packetout

This function assembles a data packet for output to the codec decoding engine. The data has already been submitted to the ogg_stream_state and broken into segments. Each successive call returns the next complete packet built from those segments. (http://www.xiph.org/ogg/doc/libogg/ogg_stream_packetout.html)

@Input: ogg_stream_state ogg_packet

@Output: -1 if we are out of sync and there is a gap in the data. 0 insufficient data available to complete a packet, or unrecoverable internal error occurred. 1 if a packet was assembled normally. op contains the next packet from the stream.

ogg_stream_packetpeek

This function attempts to assemble a raw data packet and returns it without advancing decoding. (http://www.xiph.org/ogg/doc/libogg/ogg_stream_packetpeek.html)

@Input: ogg_stream_state ogg_packet

@Output: -1, no packet available due to lost sync or a hole in the data. 0, insufficient data available to complete a packet, or on unrecoverable internal error 1, packet is available

CAVEATS

ogg_page and ogg_packet structs mostly point to storage in libvorbis/libtheora. They're never freed or manipulated directly. You may get a malloc error doing so.

oggpack_buffer struct which is used with libogg's bitpacking functions is not exposed, as you should never need to directly access anything in this structure. So are the functions manipulating oggpack_buffer, they too are not exposed. (http://www.xiph.org/ogg/doc/libogg/oggpack_buffer.html)

ogg_stream_iovecin, not implemented as this function submits packet data (in the form of an array of ogg_iovec_t, rather than using an ogg_packet structure) to the bitstream for page encapsulation. (http://www.xiph.org/ogg/doc/libogg/ogg_stream_iovecin.html)

AUTHORS

Vigith Maurice <vigith@yahoo-inc.com> www.vigith.com

COPYRIGHT

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.9 or, at your option, any later version of Perl 5 you may have available.

To install Ogg::LibOgg, copy and paste the appropriate command in to your terminal.

cpanm

cpanm Ogg::LibOgg

CPAN shell

perl -MCPAN -e shell
install Ogg::LibOgg

For more information on module installation, please visit the detailed CPAN module installation guide.

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NAME

SYNOPSIS

DESCRIPTION

EXPORT

Functions (malloc)

make_ogg_packet

make_ogg_stream_state

make_ogg_page

make_ogg_sync_state

Functions (Bitstream Primitives)

ogg_stream_init

ogg_read_page

ogg_page_bos

ogg_page_eos

ogg_page_checksum_set

ogg_page_continued

ogg_page_granulepos

ogg_page_packets

ogg_page_pageno

ogg_page_serialno

ogg_stream_clear

ogg_stream_reset

ogg_stream_reset_serialno

ogg_stream_destroy

ogg_stream_check

ogg_page_version

ogg_packet_clear

Functions (Encoding)

ogg_stream_packetin

ogg_stream_pageout

ogg_stream_flush

Functions (Decoding)

ogg_sync_init

ogg_sync_clear

ogg_sync_reset

ogg_sync_destroy

ogg_sync_check

ogg_sync_buffer

ogg_sync_wrote

ogg_sync_pageseek

ogg_sync_pageout

ogg_stream_pagein

ogg_stream_packetout

ogg_stream_packetpeek

CAVEATS

AUTHORS

COPYRIGHT

Module Install Instructions