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/**
 * @file llmediaimplgstreamer_syms.cpp
 * @brief dynamic GStreamer symbol-grabbing code
 *
 * @cond
 * $LicenseInfo:firstyear=2007&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 * @endcond
 */

#if LL_GSTREAMER010_ENABLED

#include <string>

extern "C" {
#include <gst/gst.h>

#include "apr_pools.h"
#include "apr_dso.h"
}

#include "llmediaimplgstreamertriviallogging.h"

#define LL_GST_SYM(REQ, GSTSYM, RTN, ...) RTN (*ll##GSTSYM)(__VA_ARGS__) = NULL
#include "llmediaimplgstreamer_syms_raw.inc"
#include "llmediaimplgstreamer_syms_rawv.inc"
#undef LL_GST_SYM

// a couple of stubs for disgusting reasons
GstDebugCategory*
ll_gst_debug_category_new(gchar *name, guint color, gchar *description)
{
    static GstDebugCategory dummy;
    return &dummy;
}
void ll_gst_debug_register_funcptr(GstDebugFuncPtr func, gchar* ptrname)
{
}

static bool sSymsGrabbed = false;
static apr_pool_t *sSymGSTDSOMemoryPool = NULL;
static apr_dso_handle_t *sSymGSTDSOHandleG = NULL;
static apr_dso_handle_t *sSymGSTDSOHandleV = NULL;


bool grab_gst_syms(std::string gst_dso_name,
           std::string gst_dso_name_vid)
{
    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_vid.c_str(),
                    sSymGSTDSOMemoryPool) ))
        {
            INFOMSG("Found DSO: %s", gst_dso_name_vid.c_str());
#include "llmediaimplgstreamer_syms_rawv.inc"
            rtn = !sym_error;
        }
        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.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 ( 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_rawv.inc"
#undef LL_GST_SYM

    sSymsGrabbed = false;
}


#endif // LL_GSTREAMER010_ENABLED