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/**
* @file media_plugin_base.h
* @brief Media plugin base class for LLMedia API plugin system
*
* @cond
* $LicenseInfo:firstyear=2008&license=viewerlgpl$
* 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
*/
#include "linden_common.h"
#include "llplugininstance.h"
#include "llpluginmessage.h"
#include "llpluginmessageclasses.h"
#if LL_LINUX || __FreeBSD__
struct SymbolToGrab
{
bool mRequired;
char const *mName;
apr_dso_handle_sym_t *mPPFunc;
};
class SymbolGrabber
{
public:
size_t registerSymbol( SymbolToGrab aSymbol );
bool grabSymbols(std::vector< std::string > const &aDSONames);
void ungrabSymbols();
private:
std::vector< SymbolToGrab > gSymbolsToGrab;
bool sSymsGrabbed = false;
apr_pool_t *sSymDSOMemoryPool = nullptr;
std::vector<apr_dso_handle_t *> sLoadedLibraries;
};
extern SymbolGrabber gSymbolGrabber;
// extern SymbolGrabber gSymbolGrabber;
#define LL_GRAB_SYM(SYMBOL_GRABBER, REQUIRED, SYMBOL_NAME, RETURN, ...) \
RETURN (*ll##SYMBOL_NAME)(__VA_ARGS__) = nullptr; \
size_t gRegistered##SYMBOL_NAME = SYMBOL_GRABBER.registerSymbol( \
{ REQUIRED, #SYMBOL_NAME , (apr_dso_handle_sym_t*)&ll##SYMBOL_NAME} \
);
#endif
class MediaPluginBase
{
public:
MediaPluginBase(LLPluginInstance::sendMessageFunction host_send_func, void *host_user_data);
/** Media plugin destructor. */
virtual ~MediaPluginBase() {}
/** Handle received message from plugin loader shell. */
virtual void receiveMessage(const char *message_string) = 0;
static void staticReceiveMessage(const char *message_string, void **user_data);
protected:
/** Plugin status. */
typedef enum
{
STATUS_NONE,
STATUS_LOADING,
STATUS_LOADED,
STATUS_ERROR,
STATUS_PLAYING,
STATUS_PAUSED,
STATUS_DONE
} EStatus;
/** Plugin shared memory. */
class SharedSegmentInfo
{
public:
/** Shared memory address. */
void *mAddress;
/** Shared memory size. */
size_t mSize;
};
void sendMessage(const LLPluginMessage &message);
void sendStatus();
std::string statusString();
void setStatus(EStatus status);
/// Note: The quicktime plugin overrides this to add current time and duration to the message.
virtual void setDirty(int left, int top, int right, int bottom);
/** Map of shared memory names to shared memory. */
typedef std::map<std::string, SharedSegmentInfo> SharedSegmentMap;
/** Function to send message from plugin to plugin loader shell. */
LLPluginInstance::sendMessageFunction mHostSendFunction;
/** Message data being sent to plugin loader shell by mHostSendFunction. */
void *mHostUserData;
/** Flag to delete plugin instance (self). */
bool mDeleteMe;
/** Pixel array to display. TODO:DOC are pixels always 24-bit RGB format, aligned on 32-bit boundary? Also: calling this a pixel array may be misleading since 1 pixel > 1 char. */
unsigned char* mPixels;
/** TODO:DOC what's this for -- does a texture have its own piece of shared memory? updated on size_change_request, cleared on shm_remove */
std::string mTextureSegmentName;
/** Width of plugin display in pixels. */
int mWidth;
/** Height of plugin display in pixels. */
int mHeight;
/** Width of plugin texture. */
int mTextureWidth;
/** Height of plugin texture. */
int mTextureHeight;
/** Pixel depth (pixel size in bytes). */
int mDepth;
/** Current status of plugin. */
EStatus mStatus;
/** Map of shared memory segments. */
SharedSegmentMap mSharedSegments;
};
/** The plugin <b>must</b> define this function to create its instance.
* It should look something like this:
* @code
* {
* MediaPluginFoo *self = new MediaPluginFoo(host_send_func, host_user_data);
* *plugin_send_func = MediaPluginFoo::staticReceiveMessage;
* *plugin_user_data = (void*)self;
*
* return 0;
* }
* @endcode
*/
int init_media_plugin(
LLPluginInstance::sendMessageFunction host_send_func,
void *host_user_data,
LLPluginInstance::sendMessageFunction *plugin_send_func,
void **plugin_user_data);
#if LL_LINUX
pid_t getParentPid(pid_t aPid);
bool isPluginPid(pid_t aPid);
#endif
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