afSaveFilePosition(3dm)                                afSaveFilePosition(3dm)



NAME
     afSaveFilePosition, afRestoreFilePosition - save and retrieve logical
     audio sample read pointer

SYNOPSIS
     #include <dmedia/audiofile.h>

     void afSaveFilePosition(AFfilehandle file)

     void afRestoreFilePosition(AFfilehandle file)

PARAMETER
     file   is an AFfilehandle structure, previously returned by
            afOpenFile(3dm) or afOpenFD(3dm).

DESCRIPTION
     afSaveFilePosition() stores the logical audio sample read pointer to
     allow an application to perform UNIX operations such as read(2) or
     lseek(2).  The pointer MUST then be restored via afRestoreFilePosition
     before ANY additional calls to AF routines such as afReadFrames(3dm) or
     afWriteFrames(3dm).  See the CAVEATS in afOpenFD(3dm) and afIntro(3dm).

EXAMPLE
          AFfilehandle file;
          int fd, value;
          file = afOpenFile("mysound", "r", NULL); /* open file */
          afSaveFilePosition(file);                /* save file pointer */
          fd = afGetFD(handle);                    /* get file descriptor */
                                                   /* now do UNIX operations */
          lseek(fd, 50, SEEK_SET);
          read(fd, &value, sizeof(value));

          afRestoreFilePosition(file);             /* restore pointer */
          afReadFrames(...);                       /* and go on */

SEE ALSO
     afIntro(3dm), afGetFD(3dm), afReadFrames(3dm), afWriteFrames(3dm)


















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