168 lines
4.2 KiB
C++
168 lines
4.2 KiB
C++
/**
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* @file llmediaimplgstreamer_syms.cpp
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* @brief dynamic GStreamer symbol-grabbing code
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*
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* @cond
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* $LicenseInfo:firstyear=2007&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2010, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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* $/LicenseInfo$
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* @endcond
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*/
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#if LL_GSTREAMER010_ENABLED
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#include <string>
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extern "C" {
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#include <gst/gst.h>
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#include "apr_pools.h"
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#include "apr_dso.h"
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}
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#include "llmediaimplgstreamertriviallogging.h"
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#define LL_GST_SYM(REQ, GSTSYM, RTN, ...) RTN (*ll##GSTSYM)(__VA_ARGS__) = NULL
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#include "llmediaimplgstreamer_syms_raw.inc"
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#include "llmediaimplgstreamer_syms_rawv.inc"
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#undef LL_GST_SYM
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// a couple of stubs for disgusting reasons
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GstDebugCategory*
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ll_gst_debug_category_new(gchar *name, guint color, gchar *description)
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{
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static GstDebugCategory dummy;
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return &dummy;
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}
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void ll_gst_debug_register_funcptr(GstDebugFuncPtr func, gchar* ptrname)
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{
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}
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static bool sSymsGrabbed = false;
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static apr_pool_t *sSymGSTDSOMemoryPool = NULL;
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static apr_dso_handle_t *sSymGSTDSOHandleG = NULL;
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static apr_dso_handle_t *sSymGSTDSOHandleV = NULL;
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bool grab_gst_syms(std::string gst_dso_name,
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std::string gst_dso_name_vid)
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{
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if (sSymsGrabbed)
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{
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// already have grabbed good syms
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return TRUE;
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}
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bool sym_error = false;
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bool rtn = false;
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apr_status_t rv;
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apr_dso_handle_t *sSymGSTDSOHandle = NULL;
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#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)
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//attempt to load the shared libraries
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apr_pool_create(&sSymGSTDSOMemoryPool, NULL);
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if ( APR_SUCCESS == (rv = apr_dso_load(&sSymGSTDSOHandle,
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gst_dso_name.c_str(),
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sSymGSTDSOMemoryPool) ))
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{
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INFOMSG("Found DSO: %s", gst_dso_name.c_str());
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#include "llmediaimplgstreamer_syms_raw.inc"
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if ( sSymGSTDSOHandle )
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{
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sSymGSTDSOHandleG = sSymGSTDSOHandle;
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sSymGSTDSOHandle = NULL;
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}
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if ( APR_SUCCESS ==
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(rv = apr_dso_load(&sSymGSTDSOHandle,
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gst_dso_name_vid.c_str(),
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sSymGSTDSOMemoryPool) ))
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{
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INFOMSG("Found DSO: %s", gst_dso_name_vid.c_str());
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#include "llmediaimplgstreamer_syms_rawv.inc"
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rtn = !sym_error;
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}
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else
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{
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INFOMSG("Couldn't load DSO: %s", gst_dso_name_vid.c_str());
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rtn = false; // failure
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}
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}
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else
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{
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INFOMSG("Couldn't load DSO: %s", gst_dso_name.c_str());
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rtn = false; // failure
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}
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if (sym_error)
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{
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WARNMSG("Failed to find necessary symbols in GStreamer libraries.");
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}
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if ( sSymGSTDSOHandle )
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{
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sSymGSTDSOHandleV = sSymGSTDSOHandle;
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sSymGSTDSOHandle = NULL;
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}
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#undef LL_GST_SYM
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sSymsGrabbed = !!rtn;
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return rtn;
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}
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void ungrab_gst_syms()
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{
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// should be safe to call regardless of whether we've
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// actually grabbed syms.
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if ( sSymGSTDSOHandleG )
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{
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apr_dso_unload(sSymGSTDSOHandleG);
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sSymGSTDSOHandleG = NULL;
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}
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if ( sSymGSTDSOHandleV )
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{
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apr_dso_unload(sSymGSTDSOHandleV);
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sSymGSTDSOHandleV = NULL;
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}
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if ( sSymGSTDSOMemoryPool )
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{
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apr_pool_destroy(sSymGSTDSOMemoryPool);
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sSymGSTDSOMemoryPool = NULL;
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}
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// NULL-out all of the symbols we'd grabbed
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#define LL_GST_SYM(REQ, GSTSYM, RTN, ...) do{ll##GSTSYM = NULL;}while(0)
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#include "llmediaimplgstreamer_syms_raw.inc"
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#include "llmediaimplgstreamer_syms_rawv.inc"
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#undef LL_GST_SYM
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sSymsGrabbed = false;
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}
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#endif // LL_GSTREAMER010_ENABLED
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