75 lines
1.7 KiB
C++
75 lines
1.7 KiB
C++
/*
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* Copyright 2009, Axel Dörfler, axeld@pinc-software.de.
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* Copyright 2002, Marcus Overhagen. All Rights Reserved.
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* Distributed under the terms of the MIT License.
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*/
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#ifndef _SHARED_BUFFER_LIST_H_
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#define _SHARED_BUFFER_LIST_H_
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#include <Buffer.h>
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namespace BPrivate {
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class SharedBufferList
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{
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public:
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static area_id Create(SharedBufferList** _list);
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static SharedBufferList* Get();
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static void Invalidate();
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void Put();
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void DeleteGroupAndPut(
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sem_id groupReclaimSem);
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status_t Lock();
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status_t Unlock();
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status_t AddBuffer(sem_id groupReclaimSem,
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BBuffer* buffer);
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status_t RequestBuffer(sem_id groupReclaimSem,
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int32 buffersInGroup, size_t size,
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media_buffer_id wantID,
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BBuffer** _buffer,
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bigtime_t timeout);
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status_t RecycleBuffer(BBuffer* buffer);
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status_t GetBufferList(sem_id groupReclaimSem,
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int32 bufferCount,
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BBuffer** buffers);
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private:
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struct _shared_buffer_info {
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media_buffer_id id;
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BBuffer* buffer;
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bool reclaimed;
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// The reclaim_sem belonging to the BBufferGroup of this BBuffer
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// is also used as a unique identifier of the group
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sem_id reclaim_sem;
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};
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// 16 bytes per buffer, 8 pages in total (one entry less for the list)
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enum { kMaxBuffers = 2047 };
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status_t _Init();
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void _RequestBufferInOtherGroups(
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sem_id groupReclaimSem,
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media_buffer_id id);
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private:
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sem_id fSemaphore;
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int32 fAtom;
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_shared_buffer_info fInfos[kMaxBuffers];
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int32 fCount;
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};
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} // namespace BPrivate
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#endif // _SHARED_BUFFER_LIST_H_
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