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/**
* @file llmediaimplgstreamer_syms.cpp
* @brief dynamic GStreamer symbol-grabbing code
*
* $LicenseInfo:firstyear=2007&license=viewergpl$
*
* Copyright (c) 2007-2008, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#if LL_GSTREAMER_ENABLED
extern "C" {
#include <gst/gst.h>
#include "apr_pools.h"
#include "apr_dso.h"
}
#include "llmediaimplgstreamer.h"
#define LL_GST_SYM(REQ, GSTSYM, RTN, ...) RTN (*ll##GSTSYM)(__VA_ARGS__) = NULL
#include "llmediaimplgstreamer_syms_raw.inc"
#include "llmediaimplgstreamer_syms_rawa.inc"
#include "llmediaimplgstreamer_syms_rawv.inc"
#undef LL_GST_SYM
static bool sSymsGrabbed = false;
static apr_pool_t *sSymGSTDSOMemoryPool = NULL;
static apr_dso_handle_t *sSymGSTDSOHandleG = NULL;
static apr_dso_handle_t *sSymGSTDSOHandleV = NULL;
static apr_dso_handle_t *sSymGSTDSOHandleA = NULL;
bool grab_gst_syms(std::string gst_dso_name,
std::string gst_dso_name_vid,
std::string gst_dso_name_aud)
{
if (sSymsGrabbed)
{
// already have grabbed good syms
return TRUE;
}
bool sym_error = false;
bool rtn = false;
apr_status_t rv;
apr_dso_handle_t *sSymGSTDSOHandle = NULL;
#define LL_GST_SYM(REQ, GSTSYM, RTN, ...) do{rv = apr_dso_sym((apr_dso_handle_sym_t*)&ll##GSTSYM, sSymGSTDSOHandle, #GSTSYM); if (rv != APR_SUCCESS) {INFOMSG("Failed to grab symbol: %s", #GSTSYM); if (REQ) sym_error = true;} else DEBUGMSG("grabbed symbol: %s from %p", #GSTSYM, (void*)ll##GSTSYM);}while(0)
//attempt to load the shared libraries
apr_pool_create(&sSymGSTDSOMemoryPool, NULL);
if ( APR_SUCCESS == (rv = apr_dso_load(&sSymGSTDSOHandle,
gst_dso_name.c_str(),
sSymGSTDSOMemoryPool) ))
{
INFOMSG("Found DSO: %s", gst_dso_name.c_str());
#include "llmediaimplgstreamer_syms_raw.inc"
if ( sSymGSTDSOHandle )
{
sSymGSTDSOHandleG = sSymGSTDSOHandle;
sSymGSTDSOHandle = NULL;
}
if ( APR_SUCCESS == (rv = apr_dso_load(&sSymGSTDSOHandle,
gst_dso_name_aud.c_str(),
sSymGSTDSOMemoryPool) ))
{
INFOMSG("Found DSO: %s", gst_dso_name_aud.c_str());
#include "llmediaimplgstreamer_syms_rawa.inc"
if ( sSymGSTDSOHandle )
{
sSymGSTDSOHandleA = sSymGSTDSOHandle;
sSymGSTDSOHandle = NULL;
}
if ( APR_SUCCESS ==
(rv = apr_dso_load(&sSymGSTDSOHandle,
gst_dso_name_vid.c_str(),
sSymGSTDSOMemoryPool) ))
{
INFOMSG("Found DSO: %s", gst_dso_name_vid.c_str());
#include "llmediaimplgstreamer_syms_rawv.inc"
}
else
{
INFOMSG("Couldn't load DSO: %s", gst_dso_name_vid.c_str());
rtn = false; // failure
}
}
else
{
INFOMSG("Couldn't load DSO: %s", gst_dso_name_aud.c_str());
rtn = false; // failure
}
rtn = !sym_error;
}
else
{
INFOMSG("Couldn't load DSO: %s", gst_dso_name.c_str());
rtn = false; // failure
}
if (sym_error)
{
WARNMSG("Failed to find necessary symbols in GStreamer libraries.");
}
if ( sSymGSTDSOHandle )
{
sSymGSTDSOHandleV = sSymGSTDSOHandle;
sSymGSTDSOHandle = NULL;
}
#undef LL_GST_SYM
sSymsGrabbed = !!rtn;
return rtn;
}
void ungrab_gst_syms()
{
// should be safe to call regardless of whether we've
// actually grabbed syms.
if ( sSymGSTDSOHandleG )
{
apr_dso_unload(sSymGSTDSOHandleG);
sSymGSTDSOHandleG = NULL;
}
if ( sSymGSTDSOHandleA )
{
apr_dso_unload(sSymGSTDSOHandleA);
sSymGSTDSOHandleA = NULL;
}
if ( sSymGSTDSOHandleV )
{
apr_dso_unload(sSymGSTDSOHandleV);
sSymGSTDSOHandleV = NULL;
}
if ( sSymGSTDSOMemoryPool )
{
apr_pool_destroy(sSymGSTDSOMemoryPool);
sSymGSTDSOMemoryPool = NULL;
}
// NULL-out all of the symbols we'd grabbed
#define LL_GST_SYM(REQ, GSTSYM, RTN, ...) do{ll##GSTSYM = NULL;}while(0)
#include "llmediaimplgstreamer_syms_raw.inc"
#include "llmediaimplgstreamer_syms_rawa.inc"
#include "llmediaimplgstreamer_syms_rawv.inc"
#undef LL_GST_SYM
sSymsGrabbed = false;
}
#endif // LL_GSTREAMER_ENABLED
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