call C header file from cpp

app/src/main/cpp/ffmpeg/cmdutils.cpp

@@ -28,7 +28,9 @@
 /* Include only the enabled headers since some compilers (namely, Sun
    Studio) will not omit unused inline functions and create undefined
    references to libraries that are not being built. */
-
+#ifdef __cplusplus
+extern "C" {
+#endif
 #include "config.h"
 #include "compat/va_copy.h"
 #include "libavformat/avformat.h"
@@ -53,6 +55,10 @@
 #include "libavutil/ffversion.h"
 #include "libavutil/version.h"
 #include "cmdutils.h"
+#ifdef __cplusplus
+}
+#endif
+
 #if CONFIG_NETWORK
 #include "libavformat/network.h"
 #endif

app/src/main/cpp/ffmpeg/ffmpeg.h

@@ -22,6 +22,9 @@
 #include <stdint.h>
 #include <stdio.h>
 #include <signal.h>
+#ifdef __cplusplus
+extern "C" {
+#endif
 
 #include "cmdutils.h"
 #include "config.h"
@@ -45,6 +48,9 @@
 
 #include "libswresample/swresample.h"
 
+#ifdef __cplusplus
+}
+#endif
 #define VSYNC_AUTO       -1
 #define VSYNC_PASSTHROUGH 0
 #define VSYNC_CFR         1

app/src/main/cpp/ffmpeg/ffmpeg_filter.cpp

@@ -21,7 +21,9 @@
 #include <stdint.h>
 
 #include "ffmpeg.h"
-
+#ifdef __cplusplus
+extern "C" {
+#endif
 #include "libavfilter/avfilter.h"
 #include "libavfilter/buffersink.h"
 #include "libavfilter/buffersrc.h"
@@ -36,7 +38,9 @@
 #include "libavutil/pixfmt.h"
 #include "libavutil/imgutils.h"
 #include "libavutil/samplefmt.h"
-
+#ifdef __cplusplus
+}
+#endif
 static const enum AVPixelFormat *get_compliance_unofficial_pix_fmts(enum AVCodecID codec_id, const enum AVPixelFormat default_formats[])
 {
     static const enum AVPixelFormat mjpeg_formats[] =

app/src/main/cpp/ffmpeg/ffmpeg_hw.cpp

@@ -17,9 +17,13 @@
  */
 
 #include <string.h>
-
+#ifdef __cplusplus
+extern "C" {
+#endif
 #include "libavutil/avstring.h"
-
+#ifdef __cplusplus
+}
+#endif
 #include "ffmpeg.h"
 
 static int nb_hw_devices;

app/src/main/cpp/ffmpeg/ffmpeg_opt.cpp

@@ -22,7 +22,9 @@
 
 #include "ffmpeg.h"
 #include "cmdutils.h"
-
+#ifdef __cplusplus
+extern "C" {
+#endif
 #include "libavformat/avformat.h"
 
 #include "libavcodec/avcodec.h"
@@ -40,7 +42,9 @@
 #include "libavutil/parseutils.h"
 #include "libavutil/pixdesc.h"
 #include "libavutil/pixfmt.h"
-
+#ifdef __cplusplus
+}
+#endif
 #define DEFAULT_PASS_LOGFILENAME_PREFIX "ffmpeg2pass"
 
 #define MATCH_PER_STREAM_OPT(name, type, outvar, fmtctx, st)\