FFmpeg

Commit Graph

Author	SHA1	Message	Date
Martin Storsjö	d66c52c2b3	Add support for building shared libraries with MSVC This requires the makedef perl script by Derek, from the c89-to-c99 repo. That scripts produces a .def file, listing the symbols to be exported, based on the gcc version scripts and the built object files. To properly load non-function symbols from DLL files, the data symbol declarations need to have the attribute __declspec(dllimport) when building the calling code. (On mingw, the linker can fix this up automatically, which is why it has not been an issue so far. If this attribute is omitted, linking actually succeeds, but reads from the table will not produce the desired results at runtime.) MSVC seems to manage to link DLLs (and run properly) even if this attribute is present while building the library itself (which normally isn't recommended) - other object files in the same library manage to link to the symbol (with a small warning at link time, like "warning LNK4049: locally defined symbol _avpriv_mpa_bitrate_tab imported" - it doesn't seem to be possible to squelch this warning), and the definition of the tables themselves produce a warning that can be squelched ("warning C4273: 'avpriv_mpa_bitrate_tab' : inconsistent dll linkage, see previous definition of 'avpriv_mpa_bitrate_tab'). In this setup, mingw isn't able to link object files that refer to data symbols with __declspec(dllimport) without those symbols actually being linked via a DLL (linking avcodec.dll ends up with errors like "undefined reference to `__imp__avpriv_mpa_freq_tab'"). The dllimport declspec isn't needed at all in mingw, so we simply choose not to declare it for other compilers than MSVC that requires it. (If ICL support later requires it, the condition can be extended later to include both of them.) This also implies that code that is built to link to a certain library as a DLL can't link to the same library as a static library. Therefore, we only allow building either static or shared but not both at the same time. (That is, static libraries as such can be, and actually are, built - this is used for linking the test tools to internal symbols in the libraries - but e.g. libavformat built to link to libavcodec as a DLL cannot link statically to libavcodec.) Also, linking to DLLs is slightly different from linking to shared libraries on other platforms. DLLs use a thing called import libraries, which is basically a stub library allowing the linker to know which symbols exist in the DLL and what name the DLL will have at runtime. In mingw/gcc, the import library is usually named libfoo.dll.a, which goes next to a static library named libfoo.a. This allows gcc to pick the dynamic one, if available, from the normal -lfoo switches, just as it does for libfoo.a vs libfoo.so on Unix. On MSVC however, you need to literally specify the name of the import library instead of the static library. Signed-off-by: Martin Storsjö <martin@martin.st>	12 years ago
Mans Rullgard	2e2b8ef8e0	mpegaudio: move ff_mpa_enwindow to a separate file This table is used only by mpegaudiodsp and mpegaudioenc. Separating it allows dropping some dependencies from mpc[78] and qdm2. Signed-off-by: Mans Rullgard <mans@mansr.com>	13 years ago
Anton Khirnov	82ab61f901	lavc: use avpriv_ prefix for some mpegaudio symbols used in lavf. Specifically, ff_mpa_freq_tab, ff_mpa_bitrate_tab, ff_mpa_decode_header, ff_mpegaudio_decode_header.	13 years ago
Mans Rullgard	f255a28d14	mpegaudio: clean up #includes Signed-off-by: Mans Rullgard <mans@mansr.com>	14 years ago
Mans Rullgard	2912e87a6c	Replace FFmpeg with Libav in licence headers Signed-off-by: Mans Rullgard <mans@mansr.com>	14 years ago
Diego Biurrun	ba87f0801d	Remove explicit filename from Doxygen @file commands. Passing an explicit filename to this command is only necessary if the documentation in the @file block refers to a file different from the one the block resides in. Originally committed as revision 22921 to svn://svn.ffmpeg.org/ffmpeg/trunk	15 years ago
Diego Biurrun	bad5537e2c	Use full internal pathname in doxygen @file directives. Otherwise doxygen complains about ambiguous filenames when files exist under the same name in different subdirectories. Originally committed as revision 16912 to svn://svn.ffmpeg.org/ffmpeg/trunk	16 years ago
Stefano Sabatini	987903826b	Globally rename the header inclusion guard names. Consistently apply this rule: the guard name is obtained from the filename by stripping the leading "lib", converting '/' and '.' to '_' and uppercasing the resulting name. Guard names in the root directory have to be prefixed by "FFMPEG_". Originally committed as revision 15120 to svn://svn.ffmpeg.org/ffmpeg/trunk	17 years ago
Stefan Gehrer	cf2baeb338	mark read-only data as const Originally committed as revision 13947 to svn://svn.ffmpeg.org/ffmpeg/trunk	17 years ago
Diego Biurrun	245976da2a	Use full path for #includes from another directory. Originally committed as revision 13098 to svn://svn.ffmpeg.org/ffmpeg/trunk	17 years ago
Martin Lindhe	3240941b25	Move 2 defines from mpegaudiodec.c to mpegaudiodata.h to allow compilation when DEBUG is defined. Patch by Martin Lindhe: martin startwars org Originally committed as revision 10955 to svn://svn.ffmpeg.org/ffmpeg/trunk	17 years ago
Diego Biurrun	5b21bdabe4	Add FFMPEG_ prefix to all multiple inclusion guards. Originally committed as revision 10765 to svn://svn.ffmpeg.org/ffmpeg/trunk	17 years ago
Aurelien Jacobs	677fe2e226	add proper prefix to extern mpeg audio data tables Originally committed as revision 9061 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Aurelien Jacobs	4991c0516d	move some common mpeg audio tables from mpegaudiodectab.h to mpegaudiodata.c Originally committed as revision 9060 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Diego Biurrun	f5a90186d7	Add missing license headers. Originally committed as revision 8149 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Fabrice Bellard	e3e105b38a	added include for ffserver dynamically loaded modules Originally committed as revision 809 to svn://svn.ffmpeg.org/ffmpeg/trunk	23 years ago

14 Commits (7f83959598b6565baa0091e5739dd9091ab7a990)