--- /dev/null
+ GNU GENERAL PUBLIC LICENSE
+ Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+ Preamble
+
+ The licenses for most software are designed to take away your
+freedom to share and change it. By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users. This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it. (Some other Free Software Foundation software is covered by
+the GNU Lesser General Public License instead.) You can apply it to
+your programs, too.
+
+ When we speak of free software, we are referring to freedom, not
+price. Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+ To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+ For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have. You must make sure that they, too, receive or can get the
+source code. And you must show them these terms so they know their
+rights.
+
+ We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+ Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software. If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
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+
+ Finally, any free program is threatened constantly by software
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+program proprietary. To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+ The precise terms and conditions for copying, distribution and
+modification follow.
+
+ GNU GENERAL PUBLIC LICENSE
+ TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+ 0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License. The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language. (Hereinafter, translation is included without limitation in
+the term "modification".) Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope. The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+ 1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+ 2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+ a) You must cause the modified files to carry prominent notices
+ stating that you changed the files and the date of any change.
+
+ b) You must cause any work that you distribute or publish, that in
+ whole or in part contains or is derived from the Program or any
+ part thereof, to be licensed as a whole at no charge to all third
+ parties under the terms of this License.
+
+ c) If the modified program normally reads commands interactively
+ when run, you must cause it, when started running for such
+ interactive use in the most ordinary way, to print or display an
+ announcement including an appropriate copyright notice and a
+ notice that there is no warranty (or else, saying that you provide
+ a warranty) and that users may redistribute the program under
+ these conditions, and telling the user how to view a copy of this
+ License. (Exception: if the Program itself is interactive but
+ does not normally print such an announcement, your work based on
+ the Program is not required to print an announcement.)
+
+These requirements apply to the modified work as a whole. If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works. But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Program.
+
+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+ 3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+ a) Accompany it with the complete corresponding machine-readable
+ source code, which must be distributed under the terms of Sections
+ 1 and 2 above on a medium customarily used for software interchange; or,
+
+ b) Accompany it with a written offer, valid for at least three
+ years, to give any third party, for a charge no more than your
+ cost of physically performing source distribution, a complete
+ machine-readable copy of the corresponding source code, to be
+ distributed under the terms of Sections 1 and 2 above on a medium
+ customarily used for software interchange; or,
+
+ c) Accompany it with the information you received as to the offer
+ to distribute corresponding source code. (This alternative is
+ allowed only for noncommercial distribution and only if you
+ received the program in object code or executable form with such
+ an offer, in accord with Subsection b above.)
+
+The source code for a work means the preferred form of the work for
+making modifications to it. For an executable work, complete source
+code means all the source code for all modules it contains, plus any
+associated interface definition files, plus the scripts used to
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+special exception, the source code distributed need not include
+anything that is normally distributed (in either source or binary
+form) with the major components (compiler, kernel, and so on) of the
+operating system on which the executable runs, unless that component
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+
+If distribution of executable or object code is made by offering
+access to copy from a designated place, then offering equivalent
+access to copy the source code from the same place counts as
+distribution of the source code, even though third parties are not
+compelled to copy the source along with the object code.
+
+ 4. You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License. Any attempt
+otherwise to copy, modify, sublicense or distribute the Program is
+void, and will automatically terminate your rights under this License.
+However, parties who have received copies, or rights, from you under
+this License will not have their licenses terminated so long as such
+parties remain in full compliance.
+
+ 5. You are not required to accept this License, since you have not
+signed it. However, nothing else grants you permission to modify or
+distribute the Program or its derivative works. These actions are
+prohibited by law if you do not accept this License. Therefore, by
+modifying or distributing the Program (or any work based on the
+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Program or works based on it.
+
+ 6. Each time you redistribute the Program (or any work based on the
+Program), the recipient automatically receives a license from the
+original licensor to copy, distribute or modify the Program subject to
+these terms and conditions. You may not impose any further
+restrictions on the recipients' exercise of the rights granted herein.
+You are not responsible for enforcing compliance by third parties to
+this License.
+
+ 7. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
+conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License. If you cannot
+distribute so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you
+may not distribute the Program at all. For example, if a patent
+license would not permit royalty-free redistribution of the Program by
+all those who receive copies directly or indirectly through you, then
+the only way you could satisfy both it and this License would be to
+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
+any particular circumstance, the balance of the section is intended to
+apply and the section as a whole is intended to apply in other
+circumstances.
+
+It is not the purpose of this section to induce you to infringe any
+patents or other property right claims or to contest validity of any
+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system, which is
+implemented by public license practices. Many people have made
+generous contributions to the wide range of software distributed
+through that system in reliance on consistent application of that
+system; it is up to the author/donor to decide if he or she is willing
+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+ 8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded. In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+ 9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time. Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number. If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation. If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+ 10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission. For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this. Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+ NO WARRANTY
+
+ 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+ 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+ Gnomovision version 69, Copyright (C) year name of author
+ Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary. Here is a sample; alter the names:
+
+ Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+ `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+ <signature of Ty Coon>, 1 April 1989
+ Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs. If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.
--- /dev/null
+diff --git a/include/vlc_httpd.h b/include/vlc_httpd.h
+index 6100dd0..46d557a 100644
+--- a/include/vlc_httpd.h
++++ b/include/vlc_httpd.h
+@@ -135,10 +135,10 @@ VLC_API void httpd_RedirectDelete( httpd_redirect_t * );
+
+
+ typedef struct httpd_stream_t httpd_stream_t;
+-VLC_API httpd_stream_t * httpd_StreamNew( httpd_host_t *, const char *psz_url, const char *psz_mime, const char *psz_user, const char *psz_password ) VLC_USED;
++VLC_API httpd_stream_t * httpd_StreamNew( httpd_host_t *, const char *psz_url, const char *psz_mime, const char *psz_user, const char *psz_password, bool b_metacube ) VLC_USED;
+ VLC_API void httpd_StreamDelete( httpd_stream_t * );
+ VLC_API int httpd_StreamHeader( httpd_stream_t *, uint8_t *p_data, int i_data );
+-VLC_API int httpd_StreamSend( httpd_stream_t *, uint8_t *p_data, int i_data );
++VLC_API int httpd_StreamSend( httpd_stream_t *, uint8_t *p_data, int i_data, bool b_header );
+
+
+ /* Msg functions facilities */
+diff --git a/modules/access_output/http.c b/modules/access_output/http.c
+index 61095f5..95dd705 100644
+--- a/modules/access_output/http.c
++++ b/modules/access_output/http.c
+@@ -72,6 +72,8 @@ vlc_module_begin ()
+ PASS_TEXT, PASS_LONGTEXT, true )
+ add_string( SOUT_CFG_PREFIX "mime", "",
+ MIME_TEXT, MIME_LONGTEXT, true )
++ add_bool( SOUT_CFG_PREFIX "metacube", false,
++ "Use the metacube protocol", "Use the metacube protocol", true )
+ set_callbacks( Open, Close )
+ vlc_module_end ()
+
+@@ -80,7 +82,7 @@ vlc_module_end ()
+ * Exported prototypes
+ *****************************************************************************/
+ static const char *const ppsz_sout_options[] = {
+- "user", "pwd", "mime", NULL
++ "user", "pwd", "mime", "metacube", NULL
+ };
+
+ static ssize_t Write( sout_access_out_t *, block_t * );
+@@ -114,6 +116,8 @@ static int Open( vlc_object_t *p_this )
+ char *psz_pwd;
+ char *psz_mime;
+
++ bool b_metacube;
++
+ if( !( p_sys = p_access->p_sys =
+ malloc( sizeof( sout_access_out_sys_t ) ) ) )
+ return VLC_ENOMEM ;
+@@ -188,10 +192,12 @@ static int Open( vlc_object_t *p_this )
+ {
+ psz_mime = var_GetNonEmptyString( p_access, SOUT_CFG_PREFIX "mime" );
+ }
++
++ b_metacube = var_GetBool( p_access, SOUT_CFG_PREFIX "metacube" );
+
+ p_sys->p_httpd_stream =
+ httpd_StreamNew( p_sys->p_httpd_host, path, psz_mime,
+- psz_user, psz_pwd );
++ psz_user, psz_pwd, b_metacube );
+ free( psz_user );
+ free( psz_pwd );
+ free( psz_mime );
+@@ -263,8 +269,9 @@ static ssize_t Write( sout_access_out_t *p_access, block_t *p_buffer )
+ while( p_buffer )
+ {
+ block_t *p_next;
+-
+- if( p_buffer->i_flags & BLOCK_FLAG_HEADER )
++ bool b_header_block = p_buffer->i_flags & BLOCK_FLAG_HEADER;
++
++ if( b_header_block )
+ {
+ /* gather header */
+ if( p_sys->b_header_complete )
+@@ -295,9 +302,10 @@ static ssize_t Write( sout_access_out_t *p_access, block_t *p_buffer )
+ }
+
+ i_len += p_buffer->i_buffer;
++
+ /* send data */
+ i_err = httpd_StreamSend( p_sys->p_httpd_stream, p_buffer->p_buffer,
+- p_buffer->i_buffer );
++ p_buffer->i_buffer, b_header_block );
+
+ p_next = p_buffer->p_next;
+ block_Release( p_buffer );
+diff --git a/src/network/httpd.c b/src/network/httpd.c
+index f76c47c..dcda968 100644
+--- a/src/network/httpd.c
++++ b/src/network/httpd.c
+@@ -39,6 +39,7 @@
+ #include <vlc_charset.h>
+ #include <vlc_url.h>
+ #include <vlc_mime.h>
++#include <metacube.h>
+ #include "../libvlc.h"
+
+ #include <string.h>
+@@ -66,6 +67,7 @@
+ #endif
+
+ static void httpd_ClientClean( httpd_client_t *cl );
++static void httpd_AppendData( httpd_stream_t *stream, uint8_t *p_data, int i_data );
+
+ /* each host run in his own thread */
+ struct httpd_host_t
+@@ -621,6 +623,7 @@ struct httpd_stream_t
+ httpd_url_t *url;
+
+ char *psz_mime;
++ bool b_metacube;
+
+ /* Header to send as first packet */
+ uint8_t *p_header;
+@@ -712,9 +715,24 @@ static int httpd_StreamCallBack( httpd_callback_sys_t *p_sys,
+ /* Send the header */
+ if( stream->i_header > 0 )
+ {
+- answer->i_body = stream->i_header;
+- answer->p_body = xmalloc( stream->i_header );
+- memcpy( answer->p_body, stream->p_header, stream->i_header );
++ if ( stream->b_metacube )
++ {
++ struct metacube_block_header hdr;
++ memcpy( hdr.sync, METACUBE_SYNC, sizeof(METACUBE_SYNC) );
++ hdr.size = htonl( stream->i_header );
++ hdr.flags = htonl( METACUBE_FLAGS_HEADER );
++
++ answer->i_body = stream->i_header + sizeof( hdr );
++ answer->p_body = xmalloc( answer->i_body );
++ memcpy( answer->p_body, &hdr, sizeof( hdr ) );
++ memcpy( answer->p_body + sizeof( hdr ), stream->p_header, stream->i_header );
++ }
++ else
++ {
++ answer->i_body = stream->i_header;
++ answer->p_body = xmalloc( stream->i_header );
++ memcpy( answer->p_body, stream->p_header, stream->i_header );
++ }
+ }
+ answer->i_body_offset = stream->i_buffer_last_pos;
+ vlc_mutex_unlock( &stream->lock );
+@@ -758,13 +776,18 @@ static int httpd_StreamCallBack( httpd_callback_sys_t *p_sys,
+ httpd_MsgAdd( answer, "Content-type", "%s", stream->psz_mime );
+ }
+ httpd_MsgAdd( answer, "Cache-Control", "%s", "no-cache" );
++ if ( stream->b_metacube )
++ {
++ httpd_MsgAdd( answer, "Content-encoding", "metacube");
++ }
+ return VLC_SUCCESS;
+ }
+ }
+
+ httpd_stream_t *httpd_StreamNew( httpd_host_t *host,
+ const char *psz_url, const char *psz_mime,
+- const char *psz_user, const char *psz_password )
++ const char *psz_user, const char *psz_password,
++ bool b_metacube )
+ {
+ httpd_stream_t *stream = xmalloc( sizeof( httpd_stream_t ) );
+
+@@ -783,6 +806,7 @@ httpd_stream_t *httpd_StreamNew( httpd_host_t *host,
+ {
+ stream->psz_mime = strdup( vlc_mime_Ext2Mime( psz_url ) );
+ }
++ stream->b_metacube = b_metacube;
+ stream->i_header = 0;
+ stream->p_header = NULL;
+ stream->i_buffer_size = 5000000; /* 5 Mo per stream */
+@@ -819,22 +843,10 @@ int httpd_StreamHeader( httpd_stream_t *stream, uint8_t *p_data, int i_data )
+ return VLC_SUCCESS;
+ }
+
+-int httpd_StreamSend( httpd_stream_t *stream, uint8_t *p_data, int i_data )
++static void httpd_AppendData( httpd_stream_t *stream, uint8_t *p_data, int i_data )
+ {
+- int i_count;
+- int i_pos;
+-
+- if( i_data < 0 || p_data == NULL )
+- {
+- return VLC_SUCCESS;
+- }
+- vlc_mutex_lock( &stream->lock );
+-
+- /* save this pointer (to be used by new connection) */
+- stream->i_buffer_last_pos = stream->i_buffer_pos;
+-
+- i_pos = stream->i_buffer_pos % stream->i_buffer_size;
+- i_count = i_data;
++ int i_pos = stream->i_buffer_pos % stream->i_buffer_size;
++ int i_count = i_data;
+ while( i_count > 0)
+ {
+ int i_copy;
+@@ -850,6 +862,31 @@ int httpd_StreamSend( httpd_stream_t *stream, uint8_t *p_data, int i_data )
+ }
+
+ stream->i_buffer_pos += i_data;
++}
++
++int httpd_StreamSend( httpd_stream_t *stream, uint8_t *p_data, int i_data, bool b_header )
++{
++ if( i_data < 0 || p_data == NULL )
++ {
++ return VLC_SUCCESS;
++ }
++ vlc_mutex_lock( &stream->lock );
++
++ /* save this pointer (to be used by new connection) */
++ stream->i_buffer_last_pos = stream->i_buffer_pos;
++
++ if ( stream->b_metacube ) {
++ struct metacube_block_header hdr;
++ memcpy( hdr.sync, METACUBE_SYNC, sizeof(METACUBE_SYNC) );
++ hdr.size = htonl( i_data );
++ if ( b_header ) {
++ hdr.flags = htonl( METACUBE_FLAGS_HEADER );
++ } else {
++ hdr.flags = htonl( 0 );
++ }
++ httpd_AppendData( stream, (uint8_t *)&hdr, sizeof(hdr) );
++ }
++ httpd_AppendData( stream, p_data, i_data );
+
+ vlc_mutex_unlock( &stream->lock );
+ return VLC_SUCCESS;
+diff --git a/include/metacube.h b/include/metacube.h
+new file mode 100644
+index 0000000..b40a42e
+--- /dev/null
++++ b/include/metacube.h
+@@ -0,0 +1,17 @@
++#ifndef _METACUBE_H
++#define _METACUBE_H
++
++/* Definitions for the Metacube protocol, used to communicate with Cubemap. */
++
++#include <stdlib.h>
++
++#define METACUBE_SYNC "\\o/_metacube_\\o/" /* 16 bytes long. */
++#define METACUBE_FLAGS_HEADER 0x1
++
++struct metacube_block_header {
++ char sync[16]; /* METACUBE_SYNC */
++ uint32_t size; /* Network byte order. Does not include header. */
++ uint32_t flags; /* Network byte order. METACUBE_FLAGS_*. */
++};
++
++#endif /* !defined(_METACUBE_H) */