Changes between Initial Version and Version 1 of Windows98_Support

Timestamp:

Feb 23, 2007 4:37:09 PM (17 years ago)

Author:

bennylp

Comment:

--

Windows98_Support

@@ +1 @@
+= Windows 95/98 Support in PJLIB/PJSIP/PJMEDIA =
+
+PJLIB supports both the older Windows 95/98/ME family of Microsoft OSes (win95/win98/winme) and the more advanced Windows NT family of OS'es (WinNT/2000/XP/2003/Vista). However, support for Win95/98 is not turned ON by default so it needs a bit of tweaking in both configuration and project settings.
+
+This short article describes how to enable Win95/98 support in the software. The instructions here have been tested on Windows 98, however it should work on Windows 95 and Windows ME as well.
+
+Thanks '''Sebastian E. Ovide''' for reporting and testing this.
+
+
+== Undefine WinNT in config_site.h ==
+
+The following configuration is needed in your {{{pj/config_site.h}}} file to activate Win95/98 support:
+
+{{{
+#undef PJ_WIN32_WINNT
+#define PJ_WIN32_WINNT  0x0300
+#undef _WIN32_WINNT
+}}}
+
+These would disable the use of NT features in PJLIB's {{{os_core_win32.c}}} file.
+
+
+== Disable Win32 Native File I/O in pjlib ==
+
+Still in pjlib. Since version 0.5.10, pjlib uses Win32 native {{{CreateFile()/ReadFile()/WriteFile()}}} API for dealing with file I/O, since the ANSI {{{fopen()}}} has a limitation that it can only open a maximum of {{{FOPEN_MAX}}} simultaneous file, and the limit on Windows is about 64. But unfortunately, it looks like {{{CreateFile()}}} doesn't work as expected on Win98, although it doesn't look like it uses any NT specific features.
+
+So we need to disable Win32 native file I/O and replace it with ANSI stream. To do this:
+
+ 1. Open pjlib project
+ 1. Exclude {{{file_io_win32.c}}} from pjlib build.
+ 1. Include (do not exclude) {{{file_io_ansi.c}}} in pjlib build.
+
+
+
+== Disable IoCompletionPort in pjlib ==
+
+On '''Debug''' build, the Visual Studio workspace will use socket '''select()''' as the back-end implementation for PJLIB's '''ioqueue'''. This is fine.
+
+However, on '''Release''' build, the Visual Studio workspace will use WinNT '''IOCompletionPort''' (IOCP) as the '''ioqueue''' backend, and IOCP is not available on Win95/98/ME.
+
+As a workaround for this, open the '''pjlib''' project settings, and exclude {{{ioqueue_winnt.c}}} from the Release build, and include {{{ioqueue_select.c}}} in the Release build.
+
+
+== Disable DirectSound in pjmedia ==
+
+By default, PJMEDIA uses PortAudio on Windows with DirectSound set as the prefered sound backend. This may not work properly on Win95/98, and it may be better to disable DirectSound support and just use '''waveIn/waveOut''' device.
+
+To disable DirectSound in PortAudio in PJMEDIA:
+ 1. Open pjmedia project settings
+ 1. Add {{{PA_NO_DS}}} macro in the project's '''Preprocessor''' settings.
+
+