obuffer.h
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VC书籍
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Visual C++
- /* obuffer.h
- Declarations for output buffer, includes operating system
- implementation of the virtual Obuffer. Optional routines
- enabling seeks and stops added by Jeff Tsay. */
- /*
- * @(#) obuffer.h 1.8, last edit: 6/15/94 16:51:56
- * @(#) Copyright (C) 1993, 1994 Tobias Bading (bading@cs.tu-berlin.de)
- * @(#) Berlin University of Technology
- *
- * Idea and first implementation for u-law output with fast downsampling by
- * Jim Boucher (jboucher@flash.bu.edu)
- *
- * LinuxObuffer class written by
- * Louis P. Kruger (lpkruger@phoenix.princeton.edu)
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
- #ifndef OBUFFER_H
- #define OBUFFER_H
- #include "all.h"
- #include <stdio.h> // needed for definition of NULL
- #include "args.h"
- static const uint32 OBUFFERSIZE = 2 * 1152; // max. 2 * 1152 samples per frame
- static const uint32 MAXCHANNELS = 2; // max. number of channels
- // Abstract base class for audio output classes:
- class Obuffer
- {
- public:
- virtual ~Obuffer() {} // dummy
- #ifdef COOLPRO
- virtual void append(uint32 channel, real value) = 0;
- // this function takes a 32 Bit float value from -1 to 1
- #else
- virtual void append(uint32 channel, int16 value) = 0;
- // this function takes a 32 Bit float value from -1 to 1
- #endif
- virtual void write_buffer(int32 fd) = 0;
- // this function should write the samples to the filedescriptor
- // or directly to the audio hardware
- #ifdef COOLPRO
- // OK - appendblock is not used, but it was a stab at speeding things up
- virtual void appendblock(uint32 channel, real * pvalues, int iCount) = 0;
- // this function takes an array of 32 bit float values from -1 to 1
- virtual BYTE * get_buffer(int * piNumBytes) = 0;
- // used in Cool Edit version
- #endif
- #ifdef SEEK_STOP
- virtual void clear_buffer() = 0;
- // Clears all data in the buffer (for seeking)
- virtual void set_stop_flag() = 0;
- // Notify the buffer that the user has stopped the stream
- #endif // SEEK_STOP
- };
- Obuffer *create_obuffer(MPEG_Args *maplay_args);
- #ifndef COOLPRO
- //#include "fileobuf.h"
- #endif
- #ifdef IRIX
- #include "indigo_obuffer.h"
- #endif
- #ifdef SPARC
- #include "sparc_obuffer.h"
- #endif
- #ifdef HPUX
- #include "hpux_obuffer.h"
- #endif
- #if defined(LINUX) || defined(__FreeBSD__)
- #include "linux_obuffer.h"
- #endif
- #ifdef NeXT
- #include "NeXT_obuffer.h"
- #endif
- #ifdef AIX
- #include "aix_obuffer.h"
- #endif
- #ifdef __WIN32__
- #ifdef COOLPRO
- #include "cep_obuffer.h"
- #else
- #include "mci_obuf.h"
- #include "wavefile_obuffer.h"
- #endif
- // #include "ds_obuffer.h"
- #endif
- #ifdef BEOS
- #include "beos_obuffer.h"
- #endif
- #ifdef OS2
- #include "os2_obuffer.h"
- #endif
- #endif // OBUFFER_H