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# csplugincommon/sndsys/cyclicbuf.h

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    00001 /*
    00002     Copyright (C) 2004 by Andrew Mann
    00003
    00004     This library is free software; you can redistribute it and/or
    00005     modify it under the terms of the GNU Library General Public
    00006     License as published by the Free Software Foundation; either
    00007     version 2 of the License, or (at your option) any later version.
    00008
    00009     This library is distributed in the hope that it will be useful,
    00010     but WITHOUT ANY WARRANTY; without even the implied warranty of
    00011     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    00012     Library General Public License for more details.
    00013
    00014     You should have received a copy of the GNU Library General Public
    00015     License along with this library; if not, write to the Free
    00016     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
    00017 */
    00018
    00019 #ifndef __CS_SNDSYS_CYCLICBUF_H__
    00020 #define __CS_SNDSYS_CYCLICBUF_H__
    00021
    00026 namespace CS
    00027 {
    00028 namespace SndSys
    00029 {
    00030
    00034 class CS_CRYSTALSPACE_EXPORT SoundCyclicBuffer
    00035 {
    00036 public:
    00038   SoundCyclicBuffer(size_t buffer_size);
    00039   ~SoundCyclicBuffer();
    00040
    00042   size_t GetFreeBytes();
    00043
    00049   void AddBytes(void *bytes_ptr, size_t bytes_length);
    00050
    00054   size_t GetStartValue();
    00059   size_t GetEndValue();
    00064   void AdvanceStartValue (size_t advance_amount);
    00065
    00069   void Clear (long value=0);
    00070
    00074   void GetDataPointersFromPosition (size_t* position_value, size_t max_length,
    00075     uint8 **buffer1, size_t* buffer1_length, uint8 **buffer2,
    00076     size_t* buffer2_length);
    00077
    00081   size_t GetLength() { return length; };
    00082
    00083 private:
    00085   size_t length;
    00087
    00091   size_t start_value;
    00092   size_t end_value;
    00094
    00096
    00100   uint8 *buffer_base;
    00101   uint8 *write_ptr;
    00103 };
    00104
    00105 } // namespace SndSys
    00106 } // namespace CS
    00107
    00108 #endif // __CS_SNDSYS_CYCLICBUF_H__