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msvc: Properly specify dllexport for data symbols shared across dll boundaries

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We currently only have exported data symbols within libavcodec, but
the concept is easy to extend to other libraries if necessary.
The attribute declaration needs to be in a private header though,
since we can't use CONFIG_SHARED in public installed headers.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2017-08-24 22:07:04 +03:00
parent e41daa6246
commit abf1c058d1
8 changed files with 29 additions and 21 deletions
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2
avbuild/library.mak
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@ -31,6 +31,8 @@ define RULES
$(TOOLS): THISLIB = $(NAME:%=$(LD_LIB))
$(TESTPROGS): THISLIB = $(SUBDIR)$(LIBNAME)
$(LIBOBJS): CPPFLAGS += -DBUILDING_$(NAME)
$(TESTPROGS) $(TOOLS): %$(EXESUF): %.o
$$(LD) $(LDFLAGS) $(LDEXEFLAGS) $$(LD_O) $$(filter %.o,$$^) $$(THISLIB) $(FFEXTRALIBS) $$(EXTRALIBS-$$(*F)) $$(ELIBS)

3
libavcodec/ac3tab.h
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@ -26,6 +26,7 @@
#include "libavutil/internal.h"
#include "ac3.h"
#include "internal.h"
#if CONFIG_HARDCODED_TABLES
# define HCONST const
@ -35,7 +36,7 @@
extern const uint16_t ff_ac3_frame_size_tab[38][3];
extern const uint8_t ff_ac3_channels_tab[8];
extern av_export const uint16_t avpriv_ac3_channel_layout_tab[8];
extern av_export_avcodec const uint16_t avpriv_ac3_channel_layout_tab[8];
extern const uint8_t ff_ac3_enc_channel_map[8][2][6];
extern const uint8_t ff_ac3_dec_channel_map[8][2][6];
extern const uint16_t ff_ac3_sample_rate_tab[3];

4
libavcodec/dca.h
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@ -28,12 +28,12 @@
#include <stdint.h>
#include "libavutil/float_dsp.h"
#include "libavutil/internal.h"
#include "avcodec.h"
#include "dcadsp.h"
#include "fmtconvert.h"
#include "get_bits.h"
#include "internal.h"
#define DCA_PRIM_CHANNELS_MAX (7)
#define DCA_ABITS_MAX (32) /* Should be 28 */
@ -288,7 +288,7 @@ typedef struct DCAContext {
FmtConvertContext fmt_conv;
} DCAContext;
extern av_export const uint32_t avpriv_dca_sample_rates[16];
extern av_export_avcodec const uint32_t avpriv_dca_sample_rates[16];
/**
* Convert bitstream to one representation based on sync marker

10
libavcodec/internal.h
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@ -285,4 +285,14 @@ int ff_decode_frame_props(AVCodecContext *avctx, AVFrame *frame);
*/
AVCPBProperties *ff_add_cpb_side_data(AVCodecContext *avctx);
#if defined(_MSC_VER) && CONFIG_SHARED
#ifdef BUILDING_avcodec
# define av_export_avcodec __declspec(dllexport)
#else
# define av_export_avcodec __declspec(dllimport)
#endif
#else
# define av_export_avcodec
#endif
#endif /* AVCODEC_INTERNAL_H */

16
libavcodec/jpegtables.h
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@ -23,18 +23,18 @@
#include <stdint.h>
#include "libavutil/internal.h"
#include "internal.h"
extern av_export const uint8_t avpriv_mjpeg_bits_dc_luminance[];
extern av_export const uint8_t avpriv_mjpeg_val_dc[];
extern av_export_avcodec const uint8_t avpriv_mjpeg_bits_dc_luminance[];
extern av_export_avcodec const uint8_t avpriv_mjpeg_val_dc[];
extern av_export const uint8_t avpriv_mjpeg_bits_dc_chrominance[];
extern av_export_avcodec const uint8_t avpriv_mjpeg_bits_dc_chrominance[];
extern av_export const uint8_t avpriv_mjpeg_bits_ac_luminance[];
extern av_export const uint8_t avpriv_mjpeg_val_ac_luminance[];
extern av_export_avcodec const uint8_t avpriv_mjpeg_bits_ac_luminance[];
extern av_export_avcodec const uint8_t avpriv_mjpeg_val_ac_luminance[];
extern av_export const uint8_t avpriv_mjpeg_bits_ac_chrominance[];
extern av_export const uint8_t avpriv_mjpeg_val_ac_chrominance[];
extern av_export_avcodec const uint8_t avpriv_mjpeg_bits_ac_chrominance[];
extern av_export_avcodec const uint8_t avpriv_mjpeg_val_ac_chrominance[];
void ff_mjpeg_build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code,
const uint8_t *bits_table,

3
libavcodec/mpeg4audio.h
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@ -27,6 +27,7 @@
#include "libavutil/attributes.h"
#include "get_bits.h"
#include "internal.h"
#include "put_bits.h"
typedef struct MPEG4AudioConfig {
@ -44,7 +45,7 @@ typedef struct MPEG4AudioConfig {
int frame_length_short;
} MPEG4AudioConfig;
extern av_export const int avpriv_mpeg4audio_sample_rates[16];
extern av_export_avcodec const int avpriv_mpeg4audio_sample_rates[16];
extern const uint8_t ff_mpeg4audio_channels[8];
/**

6
libavcodec/mpegaudiodata.h
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@ -29,13 +29,13 @@
#include <stdint.h>
#include "libavutil/internal.h"
#include "internal.h"
#define MODE_EXT_MS_STEREO 2
#define MODE_EXT_I_STEREO 1
extern av_export const uint16_t avpriv_mpa_bitrate_tab[2][3][15];
extern av_export const uint16_t avpriv_mpa_freq_tab[3];
extern av_export_avcodec const uint16_t avpriv_mpa_bitrate_tab[2][3][15];
extern av_export_avcodec const uint16_t avpriv_mpa_freq_tab[3];
extern const int ff_mpa_sblimit_table[5];
extern const int ff_mpa_quant_steps[17];
extern const int ff_mpa_quant_bits[17];

6
libavutil/internal.h
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@ -57,12 +57,6 @@
#endif
#endif
#if defined(_MSC_VER) && CONFIG_SHARED
# define av_export __declspec(dllimport)
#else
# define av_export
#endif
#if HAVE_PRAGMA_DEPRECATED
# if defined(__ICL)
# define FF_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:1478))