5 files changed, 408 insertions, 0 deletions
diff --git a/mpeglib/lib/util/abstract/Makefile.am b/mpeglib/lib/util/abstract/Makefile.am
new file mode 100644
index 00000000..a5c49d6b
--- /dev/null
+++ b/mpeglib/lib/util/abstract/Makefile.am
@@ -0,0 +1,14 @@
+#  player - Makefile.am
+
+
+INCLUDES                	=       $(all_includes)
+
+noinst_LTLIBRARIES		=	libutilabstract.la
+
+kmpgincludedir                  =       $(includedir)/$(THIS_LIB_NAME)/util/abstract
+
+kmpginclude_HEADERS             = 	abs_thread.h threadQueue.h
+
+
+libutilabstract_la_SOURCES	= 	abs_thread_sdl.cpp threadQueue.cpp
+
diff --git a/mpeglib/lib/util/abstract/abs_thread.h b/mpeglib/lib/util/abstract/abs_thread.h
new file mode 100644
index 00000000..f65445d8
--- /dev/null
+++ b/mpeglib/lib/util/abstract/abs_thread.h
@@ -0,0 +1,123 @@
+/*
+  abstraction for threads
+  Copyright (C) 2000 Martin Vogt
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Library General Public License as published by
+  the Free Software Foundation.
+
+  For more information look at the file COPYRIGHT in this package
+
+ */
+
+
+#ifndef __ABS_THREAD_H
+#define __ABS_THREAD_H
+
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+/**
+   This passed alle pthread_xxx calls to this interface, thus
+   it can be easier replaced with other thread "layers"
+
+   All posix pthread calls are conveterd to abs_thread.
+*/
+
+extern "C" {
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+}
+
+#define _ABS_BUSY EBUSY
+
+#ifndef SDL_WRAPPER
+// definitions for direct pthread support
+#include <pthread.h>
+
+typedef pthread_mutex_t abs_thread_mutex_t;
+typedef pthread_cond_t abs_thread_cond_t;
+typedef pthread_t abs_thread_t;
+
+
+
+#define abs_thread_cond_init(cond) pthread_cond_init(cond,NULL)
+#define abs_thread_cond_destroy(cond) pthread_cond_destroy(cond)
+#define abs_thread_cond_signal(cond) pthread_cond_signal(cond)
+#define abs_thread_cond_wait(cond,mutex) pthread_cond_wait(cond,mutex)
+
+// CREATE / JOIN THREAD
+
+#define abs_thread_create(thread,func,arg) pthread_create(thread,NULL,func,arg)
+#define abs_thread_join(th,thread_return) pthread_join(th,thread_return)
+
+// MUTEX FUNCTIONS
+
+#define abs_thread_mutex_lock(mutex) pthread_mutex_lock(mutex)
+#define abs_thread_mutex_unlock(mutex) pthread_mutex_unlock(mutex)
+#define abs_thread_mutex_init(mutex) pthread_mutex_init(mutex,NULL)
+#define abs_thread_mutex_destroy(mutex) pthread_mutex_destroy(mutex)
+
+#endif
+// not SDL_WRAPPER
+
+#ifdef SDL_WRAPPER
+
+
+// SDL SUPPORT DISABLED 
+
+#if defined WIN32
+  #include <SDL_thread.h>
+  #include <SDL_mutex.h>
+#else
+  #include <SDL/SDL_thread.h>
+  #include <SDL/SDL_mutex.h>
+#endif
+
+
+typedef SDL_mutex* abs_thread_mutex_t;
+typedef SDL_cond*  abs_thread_cond_t;
+typedef SDL_Thread* abs_thread_t;
+
+// SIGNAL FUNCTIONS
+// note we have _no_ cond attribut (not needed)
+int abs_thread_cond_init(abs_thread_cond_t* cond);
+int abs_thread_cond_destroy(abs_thread_cond_t *cond);
+
+int abs_thread_cond_signal(abs_thread_cond_t* cond);
+
+int abs_thread_cond_wait(abs_thread_cond_t* cond,
+			 abs_thread_mutex_t *mutex);
+// CREATE / JOIN THREAD
+// Note: we have thread attribute
+int abs_thread_create(abs_thread_t* thread,
+		      void * (*start_routine)(void *), void * arg);
+
+int abs_thread_join(abs_thread_t th, 
+		    void **thread_return);
+
+
+// MUTEX FUNCTIONS
+
+int abs_thread_mutex_lock(abs_thread_mutex_t *mutex);
+int abs_thread_mutex_trylock(abs_thread_mutex_t *mutex);
+int abs_thread_mutex_unlock(abs_thread_mutex_t *mutex);
+// not attribute!
+int abs_thread_mutex_init(abs_thread_mutex_t   *mutex);
+
+int abs_thread_mutex_destroy(abs_thread_mutex_t *mutex);
+
+
+
+#endif
+//SDL_WRAPPER
+
+
+
+#endif
+
+
diff --git a/mpeglib/lib/util/abstract/abs_thread_sdl.cpp b/mpeglib/lib/util/abstract/abs_thread_sdl.cpp
new file mode 100644
index 00000000..13c9ce6c
--- /dev/null
+++ b/mpeglib/lib/util/abstract/abs_thread_sdl.cpp
@@ -0,0 +1,89 @@
+/*
+  abstraction for threads
+  Copyright (C) 2000 Martin Vogt
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Library General Public License as published by
+  the Free Software Foundation.
+
+  For more information look at the file COPYRIGHT in this package
+
+ */
+
+
+#include "abs_thread.h"
+
+
+// START SDL
+
+
+#ifdef SDL_WRAPPER
+
+
+
+int abs_thread_cond_init(abs_thread_cond_t* cond) {
+  *cond=SDL_CreateCond();
+  return (*cond != NULL);
+}
+
+int abs_thread_cond_destroy(abs_thread_cond_t *cond) {
+  SDL_DestroyCond(*cond);
+  return true;
+}
+
+
+int abs_thread_cond_signal(abs_thread_cond_t* cond) {
+  
+  return SDL_CondSignal(*cond);
+}
+
+
+int abs_thread_cond_wait(abs_thread_cond_t* cond,
+			 abs_thread_mutex_t* mutex) {
+  SDL_CondWait(*cond,*mutex);
+  return true;
+}
+
+
+// CREATE / JOIN THREAD
+int abs_thread_create(abs_thread_t* thread,
+		      void * (*start_routine)(void *), void * arg) {
+  int (*func)(void *);
+  func=(int (*)(void *))start_routine;
+  *thread=SDL_CreateThread(func,arg);
+  return (*thread != NULL);
+}
+
+int abs_thread_join(abs_thread_t th, 
+		    void **thread_return) {
+  SDL_WaitThread(th,(int*)*thread_return);
+  return true;
+}
+
+
+// MUTEX FUNCTIONS
+
+int abs_thread_mutex_lock(abs_thread_mutex_t *mutex) {
+  return SDL_LockMutex(*mutex);
+}
+
+
+int abs_thread_mutex_unlock(abs_thread_mutex_t *mutex) {
+  return SDL_UnlockMutex(*mutex);
+}
+
+
+int abs_thread_mutex_init(abs_thread_mutex_t   *mutex) {
+  *mutex=SDL_CreateMutex();
+  return true;
+}
+
+
+int abs_thread_mutex_destroy(abs_thread_mutex_t *mutex) {
+  SDL_DestroyMutex(*mutex);
+  return true;
+}
+
+
+
+#endif
diff --git a/mpeglib/lib/util/abstract/threadQueue.cpp b/mpeglib/lib/util/abstract/threadQueue.cpp
new file mode 100644
index 00000000..1b130ba9
--- /dev/null
+++ b/mpeglib/lib/util/abstract/threadQueue.cpp
@@ -0,0 +1,108 @@
+/*
+  fifo waitqueue for threads.(Multi-in, single out)
+  Copyright (C) 2000  Martin Vogt
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Library General Public License as published by
+  the Free Software Foundation.
+
+  For more information look at the file COPYRIGHT in this package
+
+ */
+
+#include "threadQueue.h"
+
+#define _MAX_THREAD_IN_QUEUE 5
+
+#include <iostream>
+
+using namespace std;
+
+//
+// WaitThreadEntry class [START]
+//
+
+WaitThreadEntry::WaitThreadEntry() {
+  abs_thread_cond_init(&waitCond);
+}
+
+
+WaitThreadEntry::~WaitThreadEntry() {
+  abs_thread_cond_destroy(&waitCond);
+}
+
+//
+// WaitThreadEntry class [END]
+//
+
+
+ThreadQueue::ThreadQueue() {
+  waitThreadEntries=new WaitThreadEntry* [_MAX_THREAD_IN_QUEUE];
+  int i;
+  for(i=0;i<_MAX_THREAD_IN_QUEUE;i++) {
+    waitThreadEntries[i]=new WaitThreadEntry();
+  }
+  abs_thread_mutex_init(&queueMut);
+  insertPos=0;
+  removePos=0;
+  size=0;
+}
+
+
+ThreadQueue::~ThreadQueue() {
+  abs_thread_mutex_lock(&queueMut);
+  if (size != 0) {
+    cout << "Aieee! Make sure that all threads are out of ThreadQueue"<<endl;
+    exit(0);
+  }
+  int i;
+  for(i=0;i<_MAX_THREAD_IN_QUEUE;i++) {
+    delete waitThreadEntries[i];
+  }
+  delete [] waitThreadEntries;
+  abs_thread_mutex_unlock(&queueMut);
+  abs_thread_mutex_destroy(&queueMut);
+}
+
+
+void ThreadQueue::waitForExclusiveAccess() {
+  abs_thread_mutex_lock(&queueMut);
+  if (size == 0) {
+    abs_thread_mutex_unlock(&queueMut);
+    return;
+  }
+  // wait
+  size++;
+  if (size == _MAX_THREAD_IN_QUEUE) {
+    cout << "Aieee! ThreadQueue can only buffer:"<<_MAX_THREAD_IN_QUEUE<<endl;
+    exit(0);
+  }
+  abs_thread_cond_t* waitCond=&(waitThreadEntries[insertPos]->waitCond);
+  insertPos++;
+  // wrap counter
+  if (insertPos == _MAX_THREAD_IN_QUEUE) {
+    insertPos=0;
+  }
+  abs_thread_cond_wait(waitCond,&queueMut);
+  abs_thread_mutex_unlock(&queueMut);
+}
+
+
+void ThreadQueue::releaseExclusiveAccess() {
+  abs_thread_mutex_lock(&queueMut);
+  if (size == 0) {
+    abs_thread_mutex_unlock(&queueMut);
+    return;
+  } 
+  // wake up next thread
+  abs_thread_cond_t* waitCond=&(waitThreadEntries[removePos]->waitCond);
+  removePos++;
+  // wrap counter
+  if (removePos == _MAX_THREAD_IN_QUEUE) {
+    removePos=0;
+  }
+  size--;
+  abs_thread_cond_signal(waitCond);
+  abs_thread_mutex_unlock(&queueMut);
+}
+
diff --git a/mpeglib/lib/util/abstract/threadQueue.h b/mpeglib/lib/util/abstract/threadQueue.h
new file mode 100644
index 00000000..4c650e21
--- /dev/null
+++ b/mpeglib/lib/util/abstract/threadQueue.h
@@ -0,0 +1,74 @@
+/*
+  fifo waitqueue for threads.(Multi-in, single out)
+  Copyright (C) 2000  Martin Vogt
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Library General Public License as published by
+  the Free Software Foundation.
+
+  For more information look at the file COPYRIGHT in this package
+
+ */
+
+
+#ifndef __THREADQUEUE_H
+#define __THREADQUEUE_H
+
+
+#include "abs_thread.h"
+
+class  WaitThreadEntry {
+ public:
+  WaitThreadEntry();
+  ~WaitThreadEntry();
+
+  abs_thread_cond_t waitCond;
+};
+
+/**
+   This class can be used as a general purpuse wrapper to
+   make C++ classes thread safe.
+   Mpeglib uses for every decoder a single thread which
+   reads from the input and write to one output type (video/audio)
+   To make the input and output classes thread safe you have
+   two solutions. First you can try to do it in every class
+   itsself, this is much work and needs understanding of
+   threads or you can use this wrapper class.
+   Normally you don't need two threads in one class, only
+   for the audio/video sync this is necessary, but for
+   the inputstream (file,http,..) this not necessary.
+   For the output this is the same.
+   This class offers two methods. waitForExclusiceAcess()
+   and releaseExlusiveAcess. Internally the thread who
+   calls waitFor.. in enqueued (if it does not get the exclusive
+   access) the thread who have the exclusive access calls
+   sometimes release.. with then pass the exclusive access
+   to the next thread. 
+   Why it is needed?
+   Because we access the input/output streams from different
+   threads. A user of mpeglib may want to set mpeg video
+   in fullscreen mode, this means two threads call
+   methods in the output classes including: closing windows,
+   resizing windows ... now this is safley possible when
+   the threadSafeInputStream / threadSafeoutputStream wrappers
+   are used, which forward the calls to the real classes.
+*/
+
+class ThreadQueue {
+
+  abs_thread_mutex_t queueMut; 
+  int insertPos;
+  int removePos;
+  int size;
+  WaitThreadEntry** waitThreadEntries;
+
+ public:
+  ThreadQueue();
+  ~ThreadQueue();
+
+  void waitForExclusiveAccess();
+  void releaseExclusiveAccess();
+
+};
+
+#endif