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/*****************************************************************************
* stream.c: stream functions
*****************************************************************************
* Copyright (C) 2007-2008 the VideoLAN team
* $Id: 4dcae620646de25394b1cc71ab42fcdbef2c194a $
*
* Authors: Antoine Cellerier <dionoea at videolan tod org>
* Pierre d'Herbemont <pdherbemont # videolan.org>
*
* 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.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_meta.h>
#include <vlc_aout.h>
#include <lua.h> /* Low level lua C API */
#include <lauxlib.h> /* Higher level C API */
#include "../vlc.h"
#include "../libs.h"
/*****************************************************************************
* Stream handling
*****************************************************************************/
static int vlclua_stream_read( lua_State * );
static int vlclua_stream_readline( lua_State * );
static int vlclua_stream_delete( lua_State * );
static int vlclua_stream_add_filter( lua_State *L );
static const luaL_Reg vlclua_stream_reg[] = {
{ "read", vlclua_stream_read },
{ "readline", vlclua_stream_readline },
{ "addfilter", vlclua_stream_add_filter },
{ NULL, NULL }
};
static int vlclua_stream_new_inner( lua_State *L, stream_t *p_stream )
{
if( !p_stream )
{
lua_pushnil( L );
lua_pushliteral( L, "Error when opening stream" );
return 2;
}
stream_t **pp_stream = lua_newuserdata( L, sizeof( stream_t * ) );
*pp_stream = p_stream;
if( luaL_newmetatable( L, "stream" ) )
{
lua_newtable( L );
luaL_register( L, NULL, vlclua_stream_reg );
lua_setfield( L, -2, "__index" );
lua_pushcfunction( L, vlclua_stream_delete );
lua_setfield( L, -2, "__gc" );
}
lua_setmetatable( L, -2 );
return 1;
}
static int vlclua_stream_new( lua_State *L )
{
vlc_object_t * p_this = vlclua_get_this( L );
const char * psz_url = luaL_checkstring( L, 1 );
stream_t *p_stream = stream_UrlNew( p_this, psz_url );
return vlclua_stream_new_inner( L, p_stream );
}
static int vlclua_memory_stream_new( lua_State *L )
{
vlc_object_t * p_this = vlclua_get_this( L );
/* FIXME: duplicating the whole buffer is suboptimal. Keeping a reference to the string so that it doesn't get garbage collected would be better */
char * psz_content = strdup( luaL_checkstring( L, 1 ) );
stream_t *p_stream = stream_MemoryNew( p_this, (uint8_t *)psz_content, strlen( psz_content ), false );
return vlclua_stream_new_inner( L, p_stream );
}
static int vlclua_stream_read( lua_State *L )
{
int i_read;
stream_t **pp_stream = (stream_t **)luaL_checkudata( L, 1, "stream" );
int n = luaL_checkint( L, 2 );
uint8_t *p_read = malloc( n );
if( !p_read ) return vlclua_error( L );
i_read = stream_Read( *pp_stream, p_read, n );
lua_pushlstring( L, (const char *)p_read, i_read );
free( p_read );
return 1;
}
static int vlclua_stream_readline( lua_State *L )
{
stream_t **pp_stream = (stream_t **)luaL_checkudata( L, 1, "stream" );
char *psz_line = stream_ReadLine( *pp_stream );
if( psz_line )
{
lua_pushstring( L, psz_line );
free( psz_line );
}
else
lua_pushnil( L );
return 1;
}
static int vlclua_stream_add_filter( lua_State *L )
{
vlc_object_t *p_this = vlclua_get_this( L );
/* Make sure that we have 1 argument (+ 1 object) */
lua_settop( L, 2 );
stream_t **pp_stream = (stream_t **)luaL_checkudata( L, 1, "stream" );
if( !*pp_stream ) return vlclua_error( L );
const char *psz_filter = NULL;
if( lua_isstring( L, 2 ) )
psz_filter = lua_tostring( L, 2 );
if( !psz_filter || !*psz_filter )
{
msg_Dbg( p_this, "adding all automatic stream filters" );
while( true )
{
/* Add next automatic stream */
stream_t *p_filtered = stream_FilterNew( *pp_stream, NULL );
if( !p_filtered )
break;
else
{
msg_Dbg( p_this, "inserted an automatic stream filter" );
*pp_stream = p_filtered;
}
}
luaL_getmetatable( L, "stream" );
lua_setmetatable( L, 1 );
}
else
{
/* Add a named filter */
stream_t *p_filter = stream_FilterNew( *pp_stream, psz_filter );
if( !p_filter )
msg_Dbg( p_this, "Unable to open requested stream filter '%s'",
psz_filter );
else
{
*pp_stream = p_filter;
luaL_getmetatable( L, "stream" );
lua_setmetatable( L, 1 );
}
}
return 1;
}
static int vlclua_stream_delete( lua_State *L )
{
stream_t **pp_stream = (stream_t **)luaL_checkudata( L, 1, "stream" );
stream_Delete( *pp_stream );
return 0;
}
/*****************************************************************************
*
*****************************************************************************/
void luaopen_stream( lua_State *L )
{
lua_pushcfunction( L, vlclua_stream_new );
lua_setfield( L, -2, "stream" );
lua_pushcfunction( L, vlclua_memory_stream_new );
lua_setfield( L, -2, "memory_stream" );
}
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