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
Diego Biurrun	19cf7163c1	dca: Switch dca_sample_rates to avpriv_ prefix; it is used across libs	13 years ago
Diego Biurrun	9e4bca16f8	dca: Move tables used outside of dcadec.c to a separate file.	13 years ago
Mans Rullgard	2912e87a6c	Replace FFmpeg with Libav in licence headers Signed-off-by: Mans Rullgard <mans@mansr.com>	14 years ago
Kostya Shishkov	d041a59897	Add support for parsing and decoding DCA-HD streams. Originally committed as revision 15951 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
Diego Biurrun	5b21bdabe4	Add FFMPEG_ prefix to all multiple inclusion guards. Originally committed as revision 10765 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Guillaume Poirier	efb775777f	add a comment to indicate which #endif belong to which #define Originally committed as revision 9356 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Måns Rullgård	699b3f99d0	add multiple inclusion guards to headers Originally committed as revision 9345 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Diego Biurrun	98c98e04cc	Move dca parser to its own file. Originally committed as revision 8881 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Diego Biurrun	b78e7197a8	Change license headers to say 'FFmpeg' instead of 'this program/this library' and fix GPL/LGPL version mismatches. Originally committed as revision 6577 to svn://svn.ffmpeg.org/ffmpeg/trunk	19 years ago
Diego Biurrun	5509bffa88	Update licensing information: The FSF changed postal address. Originally committed as revision 4842 to svn://svn.ffmpeg.org/ffmpeg/trunk	19 years ago
Diego Biurrun	115329f160	COSMETICS: Remove all trailing whitespace. Originally committed as revision 4749 to svn://svn.ffmpeg.org/ffmpeg/trunk	19 years ago
Roman Shaposhnik	48b1f80012	* adding integer/floating point AAN implementations for DCT 2-4-8 Originally committed as revision 2430 to svn://svn.ffmpeg.org/ffmpeg/trunk	22 years ago
Michael Niedermayer	b4c3816cfa	optionally merge postscale into quantization table for the float aan dct Originally committed as revision 2420 to svn://svn.ffmpeg.org/ffmpeg/trunk	22 years ago
Michael Niedermayer	65e4c8c919	floating point AAN DCT Originally committed as revision 2415 to svn://svn.ffmpeg.org/ffmpeg/trunk	22 years ago
Michael Niedermayer	b0368839ac	MpegEncContext.(i)dct_* -> DspContext.(i)dct_* bitexact cleanup Originally committed as revision 1617 to svn://svn.ffmpeg.org/ffmpeg/trunk	22 years ago
Zdenek Kabelac	0c1a9edad4	* UINTX -> uintx_t INTX -> intx_t Originally committed as revision 1578 to svn://svn.ffmpeg.org/ffmpeg/trunk	22 years ago
Zdenek Kabelac	bb28568364	* cut&paste fix Originally committed as revision 1249 to svn://svn.ffmpeg.org/ffmpeg/trunk	23 years ago
Zdenek Kabelac	5940262772	* oops fixed bad initialization of ff vals. - put FF_LIBMPEG2_IDCT_PERM into CVS - so it will work for now Originally committed as revision 1227 to svn://svn.ffmpeg.org/ffmpeg/trunk	23 years ago
Zdenek Kabelac	83f238cbf0	* compilation fix (ARM users please check) Originally committed as revision 1225 to svn://svn.ffmpeg.org/ffmpeg/trunk	23 years ago
Michael Niedermayer	50eb9cbc44	idct_permutation_type variable, so the permutation type can quickly be identified Originally committed as revision 1071 to svn://svn.ffmpeg.org/ffmpeg/trunk	23 years ago
Michael Niedermayer	676e200cff	trying to fix the non-x86 IDCTs (untested) Originally committed as revision 1006 to svn://svn.ffmpeg.org/ffmpeg/trunk	23 years ago
Fabrice Bellard	ff4ec49e64	license/copyright change Originally committed as revision 599 to svn://svn.ffmpeg.org/ffmpeg/trunk	23 years ago
Fabrice Bellard	92651f67a0	arm specific code Originally committed as revision 79 to svn://svn.ffmpeg.org/ffmpeg/trunk	24 years ago

10 Commits (a3138ebfa85ec0d3aa7cbf8f2a09e40a220521cf)